Copper Alloys•Silicon Bronze•

VERIFIED(Source-Verified)

C65500 High-Silicon Bronze A

Primary Designation:UNS C65500

Aliases:

High-Silicon Bronze ASilicon Bronze AC65500

Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification or guaranteed lot conformity. Read engineering disclaimer →

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Data Completeness:7 composition elements and 131 condition-specific property values cataloged.

Omitted fields represent unverified properties. "Missing is better than invented."

Key Engineering Properties

Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.

Density

8.525 g/cm³TYPICAL · at 20 °C

Electrical Conductivity

7 % IACSTYPICAL · at 20 °C

Thermal Conductivity

36.35 W/(m·K)TYPICAL · at 20 °C

Specific Heat Capacity

376.8 J/(kg·K)TYPICAL · at 20 °C

Melting Range (Solidus / Liquidus)

971.1 – 1026.7 °C1780.0 – 1880.0 °F

Solidus: 971.1°C | Liquidus: 1026.7°C

Composition Excerpt

Cu BALANCE wt%Copper (balance)

Standard Elemental Basis: BALANCE

Engineering Summary

UNS C65500 High-Silicon Bronze A (2.8-3.8% Si, 0.50-1.3% Mn, Cu Remainder) combines the corrosion resistance of pure copper with high tensile strength and outstanding TIG/MIG weldability. Widely specified for chemical process equipment, pressure vessels, marine fasteners, and architectural hardware.

C65500 High-Silicon Bronze A Documented Applications

›Bearing Plates: Friction & Wear Properties
›Bearing Plates: Mechanical Properties
›Bolts: Mechanical Properties
›Burrs: Corrosion Resistance
›Burrs: Mechanical Properties
›Bushings: Corrosion Resistance
›Bushings: Friction & Wear Properties
›Bushings: Mechanical Properties
›Butts: Corrosion Resistance
›Butts: Mechanical Properties
›Cable: Corrosion Resistance
›Cable: Forming Characteristics

Recognized Aliases

Source-backed commercial trade name and short designations cataloged in canonical data.

High-Silicon Bronze ASilicon Bronze AC65500

C65500 High-Silicon Bronze A Specifications & Designations

Standard Designations & Applicable Specifications — Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.

Direct Standard DesignationsDIRECT DESIGNATION

2 Primary Identifiers

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System	Identifier	Standard System Name	Classification Notes & Provenance
UNSPRIMARY	C65500	Unified Numbering System	Unified Numbering System standard designation for copper alloys (CDA / SAE / ASTM)Ref: CDA UNS Standard Designations Register (C65500)
CDA	Alloy 655	Copper Development Association Alloy Number	CDA three-digit legacy designationRef: CDA UNS Standard Designations Register (C65500)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

3 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
High-Silicon Bronze A	Standard Commercial Name	CDA Standard Commercial Name
Silicon Bronze A	Commercial Alias	Colloquial or commercial industry synonym
C65500	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

12 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	ASTM B124/B124M	COPPER AND COPPER-ALLOY FORGING ROD, BAR AND SHAPES	Specification Reference
SAE	SAE J461	WROUGHT AND CAST COPPER ALLOYS	Specification Reference
SAE	SAE J463	WROUGHT COPPER AND COPPER ALLOYS	Specification Reference
ASTM	ASTM F468	NONFERROUS BOLTS, HEX CAP SCREWS, AND STUDS FOR GENERAL USE	Specification Reference
ASME	ASME SB283	COPPER AND COPPER ALLOY DIE FORGINGS (HOT PRESSED)	Specification Reference
ASTM	ASTM B283/B283M	COPPER AND COPPER ALLOY DIE FORGINGS (HOT PRESSED)	Specification Reference
ASTM	ASTM F467	NONFERROUS NUTS FOR GENERAL USE	Specification Reference
ASTM	ASTM B100	ROLLED COPPER ALLOY BEARING AND EXPANSION PLATES AND SHEETS FOR BRIDGE AND OTHER STRUCTURAL USES	Specification Reference
ASTM	ASTM B98/B98M	COPPER-SILICON ALLOY ROD, BAR AND SHAPES	Specification Reference
ASME	ASME SB98	COPPER-SILICON ALLOY ROD, BAR AND SHAPES	Specification Reference
ASTM	ASTM B315	SEAMLESS COPPER ALLOY PIPE AND TUBE	Specification Reference
ASME	ASME SB315	COPPER-SILICON ALLOY SEAMLESS PIPE AND TUBE	Specification Reference

Engineering Notice: Applicable specifications establish manufacturing requirements, dimensional tolerances, and test criteria for specific product forms (e.g. bus bar, wire, plate, pipe). They represent applicable technical standards, not alternative or equivalent alloy grades.

C65500 High-Silicon Bronze A Chemical Composition

Chemical Composition (Weight %) — Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).

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Element	Symbol	Atomic No.	Semantic Basis	Specified Value	Unit	Metallurgical Notes & Qualification	Data Status
Copper	Cu	29	BALANCE	Balance	wt%	Remainder element (Copper).Ref: Copper Development Association (CDA)	VERIFIED
Lead	Pb	82	MAXIMUM	≤ 0.05	wt%	CDA chemical composition specification limits for C65500: max 0.05 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Zinc	Zn	30	MAXIMUM	≤ 1.50	wt%	CDA chemical composition specification limits for C65500: max 1.5 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Iron	Fe	26	MAXIMUM	≤ 0.80	wt%	CDA chemical composition specification limits for C65500: max 0.8 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Nickel	Ni	28	MAXIMUM	≤ 0.60	wt%	CDA chemical composition specification limits for C65500: max 0.6 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Manganese	Mn	25	RANGE	0.50 – 1.30	wt%	CDA chemical composition specification limits for C65500: 0.5 - 1.3 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Silicon	Si	14	RANGE	2.80 – 3.80	wt%	CDA chemical composition specification limits for C65500: 2.8 - 3.8 wt%.Ref: Copper Development Association (CDA)	VERIFIED

* Elemental percentages are expressed in weight percent (wt%). Values represent applicable specification limits. Unspecified trace elements are not fabricated or assumed.Preserves exact semantic basis

Property Display UnitsSwitch between Canonical SI and Source / US Customary units:

C65500 High-Silicon Bronze A Physical Properties

Source-specific physical properties. Test temperatures are shown only where reported.

1 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Density	8.525 g/cm³	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Density 0.308 lb/cu in. at 68°F (8.525 g/cm³ at 20°C)	0.308 lb/cu in. at 68°F	Copper Development Association Inc.	VERIFIED

C65500 High-Silicon Bronze A Thermal & Thermodynamic Properties

Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.

7 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Liquidus Temperature	1026.7 °C	TYPICAL	CDA Physical Properties: Liquidus temperature 1880.0 °F (1026.7 °C)	1880.0 °F	Copper Development Association Inc.	VERIFIED
Solidus Temperature	971.1 °C	TYPICAL	CDA Physical Properties: Solidus temperature 1780.0 °F (971.1 °C)	1780.0 °F	Copper Development Association Inc.	VERIFIED
Thermal Conductivity	36.35 W/(m·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Thermal conductivity 21.0 Btu/(ft·hr·°F) (36.35 W/(m·K) at 20°C)	21.0 Btu/ sq ft/ ft hr/ °F at 68°F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	18 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 10.0 µin/(in·°F) (18.0 µm/(m·K)) over range 68-57210°F	10.0 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Specific Heat Capacity	376.8 J/(kg·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Specific heat 0.09 Btu/(lb·°F) (376.8 J/(kg·K))	0.09 Btu/ lb /°F at 68°F	Copper Development Association Inc.	VERIFIED
Annealing Temperature Range	482.2 – 704.4 °C	RANGE	CDA Thermal Treatments: Annealing temperature range 900 - 1300°F (482.2 - 704.4°C)	900 – 1300 °F	Copper Development Association Inc.	VERIFIED
Hot Working Temperature Range	704.4 – 871.1 °C	RANGE	CDA Thermal Treatments: Hot working range 1300 - 1600°F (704.4 - 871.1°C)	1300 – 1600 °F	Copper Development Association Inc.	VERIFIED

C65500 High-Silicon Bronze A Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

1 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Electrical Conductivity	7 % IACS	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Volume conductivity 7.0 % IACS at 68°F (20°C)	7.0 % IACS at 68°F	Copper Development Association Inc.	VERIFIED

C65500 High-Silicon Bronze A Mechanical Properties

Contextual Mechanical Properties & Tempers: Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.

Elastic & Baseline Mechanical ConstantsSource-specific measurement conditions

Modulus of Elasticity (Tension)

103.4 GPa

CDA Physical Properties: Elastic modulus in tension 15000.0 ksi (103.4 GPa)

Modulus of Rigidity

38610.6 MPa

CDA Physical Properties: Shear modulus 5600.0 ksi (38610.6 MPa)

Machinability Rating

30 %

CDA Fabrication Properties: Rating relative to Free-Cutting Brass (C36000 = 100%).

Forgeability Rating

40 —

CDA Fabrication Properties: Relative forgeability rating.

Product Form:

Temper / Condition:

Showing 48 of 48 conditions

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Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Flat Products	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 537.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Elongation: 17 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H02	0.04	537.8 MPa	—	17 %	—	—	—	VERIFIED
Flat Products	1/2 Hard (H02) Source values and qualifiers Rockwell B Hardness: 87 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 75 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 344.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H02	0.04	—	—	—	344.7 MPa	—	87 HRB75 HR30T	VERIFIED
Flat Products	1/4 Hard (H01) · 20 °C Source values and qualifiers Tensile Strength: 468.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 241.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 30 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H01	0.04	468.8 MPa	241.3 MPa	30 %	—	—	—	VERIFIED
Flat Products	1/4 Hard (H01) Source values and qualifiers Rockwell B Hardness: 75 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 67 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 324.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H01	0.04	—	—	—	324.1 MPa	—	75 HRB67 HR30T	VERIFIED
Flat Products	Extra Hard (H06) · 20 °C Source values and qualifiers Tensile Strength: 717.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 413.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 6 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H06	0.04	717.1 MPa	413.7 MPa	6 %	—	—	—	VERIFIED
Flat Products	Extra Hard (H06) Source values and qualifiers Rockwell B Hardness: 96 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 80 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 413.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H06	0.04	—	—	—	413.7 MPa	—	96 HRB80 HR30T	VERIFIED
Flat Products	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 648.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 399.9 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H04	0.04	648.1 MPa	399.9 MPa	8 %	—	—	—	VERIFIED
Flat Products	Hard (H04) Source values and qualifiers Rockwell B Hardness: 93 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 78 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 393 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H04	0.04	—	—	—	393 MPa	—	93 HRB78 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.015 mm (OS015) · 20 °C Source values and qualifiers Tensile Strength: 434.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 206.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 55 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS015	0.04	434.4 MPa	206.8 MPa	55 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.015 mm (OS015) Source values and qualifiers Rockwell B Hardness: 66 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 90 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 310.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS015	0.04	—	—	—	310.3 MPa	—	66 HRB90 HRF	VERIFIED
Flat Products	Nominal Grain Size 0.035 mm (OS035) · 20 °C Source values and qualifiers Tensile Strength: 413.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 172.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 60 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS035	0.04	413.7 MPa	172.4 MPa	60 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.035 mm (OS035) Source values and qualifiers Rockwell B Hardness: 62 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 85 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 296.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS035	0.04	—	—	—	296.5 MPa	—	62 HRB85 HRF	VERIFIED
Flat Products	Nominal Grain Size 0.070 mm (OS070) · 20 °C Source values and qualifiers Tensile Strength: 386.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 144.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 63 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS070	0.04	386.1 MPa	144.8 MPa	63 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.070 mm (OS070) Source values and qualifiers Rockwell B Hardness: 40 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 76 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 289.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS070	0.04	—	—	—	289.6 MPa	—	40 HRB76 HRF	VERIFIED
Flat Products	Spring (H08) · 20 °C Source values and qualifiers Tensile Strength: 758.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 427.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 4 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H08	0.04	758.4 MPa	427.5 MPa	4 %	—	—	—	VERIFIED
Flat Products	Spring (H08) Source values and qualifiers Rockwell B Hardness: 97 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 81 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 434.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H08	0.04	—	—	—	434.4 MPa	—	97 HRB81 HR30T	VERIFIED
Flat Products & Wire	Nominal Grain Size 0.035 mm (OS035) · 20 °C Source values and qualifiers Tensile Strength: 413.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 60 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — OS035	0.08	413.7 MPa	—	60 %	—	—	—	VERIFIED
Flat Products & Wire	Spring (H08) · 20 °C Source values and qualifiers Tensile Strength: 999.7 MPa (TYPICAL)Section Size: 0.08; Cold Work: 80%; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 482.6 MPa (TYPICAL)Section Size: 0.08; Cold Work: 80%; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 3 % (TYPICAL)Section Size: 0.08; Cold Work: 80%; Section Size: 0.08 inCopper Development Association (CDA) — H08	0.08	999.7 MPa	482.6 MPa	3 %	—	—	—	VERIFIED
Flat Products & Wire	Spring (H08) · 20 °C Source values and qualifiers Tensile Strength: 758.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 427.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 4 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H08	0.04	758.4 MPa	427.5 MPa	4 %	—	—	—	VERIFIED
Flat Products, Rod & Bar	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 675.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H02	0.08	675.7 MPa	—	8 %	—	—	—	VERIFIED
Flat Products, Rod & Bar	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 537.8 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 310.3 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 35 % (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — H02	1	537.8 MPa	310.3 MPa	35 %	—	—	—	VERIFIED
Flat Products, Rod & Bar	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 537.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 310.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 17 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H02	0.04	537.8 MPa	310.3 MPa	17 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 537.8 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — Elongation: 35 % (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — H02	1	537.8 MPa	—	35 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) Source values and qualifiers Rockwell B Hardness: 85 HRB (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 358.5 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — H02	1	—	—	—	358.5 MPa	—	85 HRB	VERIFIED
Rod	Extra Hard (H06) · 20 °C Source values and qualifiers Tensile Strength: 744.6 MPa (TYPICAL)Section Size: 1; Cold Work: 50%; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 413.7 MPa (TYPICAL)Section Size: 1; Cold Work: 50%; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 13 % (TYPICAL)Section Size: 1; Cold Work: 50%; Section Size: 1 inCopper Development Association (CDA) — H06	1	744.6 MPa	413.7 MPa	13 %	—	—	—	VERIFIED
Rod	Extra Hard (H06) Source values and qualifiers Rockwell B Hardness: 95 HRB (TYPICAL)Section Size: 1; Cold Work: 50%; Section Size: 1 inCopper Development Association (CDA) — H06	1	—	—	—	—	—	95 HRB	VERIFIED
Rod	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 634.3 MPa (TYPICAL)Section Size: 1; Cold Work: 36%; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 379.2 MPa (TYPICAL)Section Size: 1; Cold Work: 36%; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 22 % (TYPICAL)Section Size: 1; Cold Work: 36%; Section Size: 1 inCopper Development Association (CDA) — H04	1	634.3 MPa	379.2 MPa	22 %	—	—	—	VERIFIED
Rod	Hard (H04) Source values and qualifiers Rockwell B Hardness: 90 HRB (TYPICAL)Section Size: 1; Cold Work: 36%; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 399.9 MPa (TYPICAL)Section Size: 1; Cold Work: 36%; Section Size: 1 inCopper Development Association (CDA) — Fatigue Strength: 206.8 MPa (TYPICAL)Section Size: 1; Cold Work: 36%; Section Size: 1 in; 10^8 cycles endurance limitCopper Development Association (CDA) — H04	1	—	—	—	399.9 MPa	206.8 MPa	90 HRB	VERIFIED
Rod	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 399.9 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 151.7 MPa (TYPICAL)Section Size: 1; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 60 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — OS050	1	399.9 MPa	151.7 MPa	60 %	—	—	—	VERIFIED
Rod	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell B Hardness: 60 HRB (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 296.5 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — OS050	1	—	—	—	296.5 MPa	—	60 HRB	VERIFIED
Rod & Tubing	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 399.9 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Elongation: 60 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — OS050	1	399.9 MPa	—	60 %	—	—	—	VERIFIED
Rod & Tubing	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 393 MPa (TYPICAL)Copper Development Association (CDA) — Elongation: 70 % (TYPICAL)Copper Development Association (CDA) — OS050	—	393 MPa	—	70 %	—	—	—	VERIFIED
Tube	Hard Drawn (H80) · 20 °C Source values and qualifiers Tensile Strength: 641.2 MPa (TYPICAL)Section Size: 0.065; Cold Work: 35%; Section Size: 0.065 inCopper Development Association (CDA) — Elongation: 22 % (TYPICAL)Section Size: 0.065; Cold Work: 35%; Section Size: 0.065 inCopper Development Association (CDA) — H80	0.065	641.2 MPa	—	22 %	—	—	—	VERIFIED
Tube	Hard Drawn (H80) Source values and qualifiers Rockwell B Hardness: 92 HRB (TYPICAL)Section Size: 0.065; Cold Work: 35%; Section Size: 0.065 inCopper Development Association (CDA) — Rockwell 30T Hardness: 78 HR30T (TYPICAL)Section Size: 0.065; Cold Work: 35%; Section Size: 0.065 inCopper Development Association (CDA) — H80	0.065	—	—	—	—	—	92 HRB78 HR30T	VERIFIED
Tube	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 393 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — Elongation: 70 % (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS050	0.065	393 MPa	—	70 %	—	—	—	VERIFIED
Tube	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell B Hardness: 45 HRB (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS050	0.065	—	—	—	—	—	45 HRB	VERIFIED
Wire	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 675.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H02	0.08	675.7 MPa	—	8 %	—	—	—	VERIFIED
Wire	1/2 Hard (H02) Source values and qualifiers Shear Strength: 399.9 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H02	0.08	—	—	—	399.9 MPa	—	—	VERIFIED
Wire	1/4 Hard (H01) · 20 °C Source values and qualifiers Tensile Strength: 551.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 330.9 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H01	0.08	551.6 MPa	330.9 MPa	20 %	—	—	—	VERIFIED
Wire	1/4 Hard (H01) Source values and qualifiers Shear Strength: 358.5 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H01	0.08	—	—	—	358.5 MPa	—	—	VERIFIED
Wire	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile Strength: 482.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 35 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H00	0.08	482.6 MPa	275.8 MPa	35 %	—	—	—	VERIFIED
Wire	1/8 Hard (H00) Source values and qualifiers Shear Strength: 330.9 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H00	0.08	—	—	—	330.9 MPa	—	—	VERIFIED
Wire	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 861.8 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 448.2 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 5 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H04	0.08	861.8 MPa	448.2 MPa	5 %	—	—	—	VERIFIED
Wire	Hard (H04) Source values and qualifiers Shear Strength: 448.2 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Fatigue Strength: 199.9 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; 10^8 cycles endurance limitCopper Development Association (CDA) — H04	0.08	—	—	—	448.2 MPa	199.9 MPa	—	VERIFIED
Wire	Nominal Grain Size 0.035 mm (OS035) · 20 °C Source values and qualifiers Tensile Strength: 413.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 172.4 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 60 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — OS035	0.08	413.7 MPa	172.4 MPa	60 %	—	—	—	VERIFIED
Wire	Nominal Grain Size 0.035 mm (OS035) Source values and qualifiers Shear Strength: 296.5 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — OS035	0.08	—	—	—	296.5 MPa	—	—	VERIFIED
Wire	Spring (H08) · 20 °C Source values and qualifiers Tensile Strength: 999.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 482.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 3 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H08	0.08	999.7 MPa	482.6 MPa	3 %	—	—	—	VERIFIED
Wire	Spring (H08) Source values and qualifiers Shear Strength: 482.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Fatigue Strength: 206.8 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; 10^8 cycles endurance limitCopper Development Association (CDA) — H08	0.08	—	—	—	482.6 MPa	206.8 MPa	—	VERIFIED

Hardness Integrity Notice: Rockwell B (HRB), Rockwell F (HRF), and Superficial 30T (HR30T) scales are reported on their measured scales without cross-scale mathematical conversion.

Source: See fact-level citations

C65500 High-Silicon Bronze A Processing & Fabrication

Machining, joining, forming, and thermal processing ratings cataloged from the cited authoritative technical reference.

Source: Copper Development Association (CDA)

Machinability

Machinability rating: 30% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 40.

Weldability & Joining

Soldering: Good; Brazing: Excellent; Oxyacetylene Welding: Good; Gas Shielded Arc Welding: Excellent; Coated Metal Arc Welding: Fair; Spot Weld: Excellent; Seam Weld: Excellent; Butt Weld: Excellent

Heat Treatment & Working Ranges

Annealing temperature range: 482.2°C to 704.4°C (900°F - 1300°F). Hot working temperature range: 704.4°C to 871.1°C (1300°F - 1600°F).

Forming & Cold Working

Capacity for Being Cold Worked: Excellent. Capacity for Being Hot Formed: Excellent.

Practical Engineering & Fabrication Notes

By Mat Grades Editorial Desk · Updated 2026-11-14. Use alongside the specified product standard and supplier certificate.

Machining & shop-floor behavior

The cataloged machining note for C65500 High-Silicon Bronze A states: Machinability rating: 30% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 40. A relevant hardness example is Rockwell B Hardness: 87 HRB (typical; 1/2 Hard (H02), H02, Flat Products, 0.04). Use that supplied condition for a trial of the difficult feature. Record tool changes, burr removal, unclamped dimensions and accepted parts per hour. Relative machinability ratings from different reference scales should not be compared as if they were one common test.

Weldability, brazing & joining

The available joining assessment states: Soldering: Good; Brazing: Excellent; Oxyacetylene Welding: Good; Gas Shielded Arc Welding: Excellent; Coated Metal Arc Welding: Fair; Spot Weld: Excellent; Seam Weld: Excellent; Butt Weld: Excellent The first cataloged strength example is Tensile Strength: 537.8 MPa (typical; 1/2 Hard (H02), H02, Flat Products, 0.04; test temperature 20 °C). Assess the final part after joining or thermal processing. Include distortion, cleanup and inspection in the quotation. A material designation or favorable process rating is a starting point for qualification, not evidence that an untested joint meets the drawing.

Corrosion & service environment

Review the working fluid, cleaning agents and dissimilar-metal contacts as separate exposures. The word copper, brass or bronze is too broad to establish compatibility. A process rating does not qualify a pressure boundary, and a thermal-property measurement does not establish a continuous service-temperature limit. The recorded thermal example is Thermal Conductivity: 36.35 W/(m·K) (typical; ; test temperature 20 °C). State the exposure and inspection access in the design record so that a change of installation or cleaning method triggers a review. The selected composition entries are Pb maximum 0.05 wt%, Zn maximum 1.5 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

Use UNS C65500, COMMERCIAL High-Silicon Bronze A, CDA Alloy 655 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Bearing Plates: Friction & Wear Properties as an application example. The related candidate C51000 Phosphor Bronze 5% A is linked for comparison; its commonly compared relationship must be checked before substitution. Compare the complete route through machining, joining, finish and inspection. Keep the certificate, required test location and acceptance criteria with the first-article record. A later change of grade, condition or source should be assessed against that same requirement.

Technical references: Copper Development Association (CDA); Copper Development Association (CDA)

C65500 High-Silicon Bronze A Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for C65500 High-Silicon Bronze A. Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status	Action
C51000 Phosphor Bronze 5% A	Copper Alloys	Commonly Compared	C65500 High-Silicon Bronze A offers superior TIG/MIG weldability, corrosion resistance, and cold ductility for marine fasteners and pressure vessels, whereas C51000 offers higher cyclic spring fatigue endurance.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED
C61400 Aluminum Bronze D	Copper Alloys	Commonly Compared	Both are corrosion-resistant wrought copper alloys with excellent weldability; C65500 provides higher cold forming capability; C61400 provides higher cavitation resistance.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED

Related Engineering & Metallurgy Guides

Contextual technical guides explaining degradation mechanisms, testing methodologies, and selection criteria relevant to C65500 High-Silicon Bronze A.

Material Selection8–10 min read

Brass vs Bronze: Composition, Bearing Wear and Marine Selection

Use the specific alloy and lubrication duty rather than choosing by color or family name.

Author: Mat Grades Editorial DeskRead Guide →

Sources

Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.

Copper Development Association Inc.CDA Alloy C65500 Property & Specification Profile

AUTHORITATIVE BODY

Copper Development Association authoritative technical reference profile for C65500 High-Silicon Bronze A.

Issuing Body: Copper Development Association (CDA)View Source Record ↗

Copper Development Association Inc.CDA UNS Standard Designations Register (C65500)

AUTHORITATIVE BODY

Unified Numbering System (UNS) designation registration register confirming active C65500 status.

Issuing Body: Copper Development Association (CDA)View Source Record ↗

Intellectual Property & Provenance Notice: Mat Grades cites technical literature from recognized industry associations and standards organizations. Underlying technical standards and publication data remain the intellectual property of their respective issuing organizations.