Stainless Steel•Precipitation Hardening•

VERIFIED(Source-Verified)

17-4 PH (630) Stainless Steel

Primary Designation:COMMERCIAL 17-4 PH

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:9 composition elements and 41 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

7.78 g/cm³TYPICAL · Condition A · temperature not stated

Thermal Conductivity

17.9 W/(m·K)TYPICAL · H900 · at 149 °C

Composition Excerpt

C ≤ 0.07 wt%Carbon (max)

Standard Elemental Basis: MAX

Tensile Strength

1379 MPaTYPICAL · H900 · temperature not stated

Reported: 200

Engineering Summary

17-4 PH (630) Stainless Steel. Source-scoped engineering data is shown with its reported limits and conditions. Unreported properties are not inferred.

Recognized Aliases

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

17-4 PH (630) Stainless Steel 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
TYPE	630	Producer-referenced stainless type	—Ref: ARMCO 17-4 PH Stainless Steel Product Data Bulletin
UNS	S17400	Unified Numbering System	—Ref: ARMCO 17-4 PH Stainless Steel Product Data Bulletin

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

1 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
17-4 PH	Common material name	Recognized commercial trade designation

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

2 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	A564	Standard technical specification.Producer lists Type 630 bars and shapes; edition not stated. This is a product specification, not an equivalent identity. · PRODUCT_SPECIFICATION · Product form: Bar	Specification Reference
17-4	17-4 PH (630) Stainless Steel Engineering Datasheet	Applicable specification reference.	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.

17-4 PH (630) Stainless Steel 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
Carbon	C	6	MAXIMUM	≤ 0.07	wt%	Source cell: .07max. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Manganese	Mn	25	MAXIMUM	≤ 1.00	wt%	Source cell: 1.00max. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Phosphorus	P	15	MAXIMUM	≤ 0.04	wt%	Source cell: .04max. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Sulfur	S	16	MAXIMUM	≤ 0.03	wt%	Source cell: .03max. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Silicon	Si	14	MAXIMUM	≤ 1.00	wt%	Source cell: 1.00max. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Chromium	Cr	24	RANGE	15.00 – 17.50	wt%	Source cell: 15.00/17.50. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Nickel	Ni	28	RANGE	3.00 – 5.00	wt%	Source cell: 3.00/5.00. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Copper	Cu	29	RANGE	3.00 – 5.00	wt%	Source cell: 3.00/5.00. Scope: printed p1, composition wt%.Ref: Cleveland-Cliffs AK Steel International	VERIFIED
Niobium	Nb + Ta	41	RANGE	0.15 – 0.45	wt%	Combined Nb + Ta limit; producer makes no intentional Ta addition. No individual split inferred.Ref: Cleveland-Cliffs AK Steel International	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:

17-4 PH (630) Stainless Steel Physical Properties

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

7 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
DensityCondition: Condition A	7.78 g/cm³	TYPICAL	Source temperature not specified. Metric density retained independently; rounded imperial equivalents are not used.	7.78 g/cm³	Cleveland-Cliffs AK Steel International	VERIFIED
DensityCondition: H900	7.8 g/cm³	TYPICAL	Source temperature not specified. Metric density retained independently; rounded imperial equivalents are not used.	7.8 g/cm³	Cleveland-Cliffs AK Steel International	VERIFIED
DensityCondition: H1075	7.81 g/cm³	TYPICAL	Source temperature not specified. Metric density retained independently; rounded imperial equivalents are not used.	7.81 g/cm³	Cleveland-Cliffs AK Steel International	VERIFIED
DensityCondition: H1150	7.82 g/cm³	TYPICAL	Source temperature not specified. Metric density retained independently; rounded imperial equivalents are not used.	7.82 g/cm³	Cleveland-Cliffs AK Steel International	VERIFIED
Density	7.75 g/cm³	TYPICAL		7.75 g/cm3	Carpenter Technology Corporation	VERIFIED
Elastic Modulus	196 GPa	TYPICAL		196 GPa	Carpenter Technology Corporation	VERIFIED
Poisson's Ratio	0.27 dimensionless	TYPICAL		0.27 dimensionless	Carpenter Technology Corporation	VERIFIED

17-4 PH (630) Stainless Steel Thermal & Thermodynamic Properties

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

6 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Thermal ConductivityCondition: H900	17.9 W/(m·K)	TYPICAL	Test Temp: 149 °C	17.9 W/(m·K)	Cleveland-Cliffs AK Steel International	VERIFIED
Thermal ConductivityCondition: H900	19.5 W/(m·K)	TYPICAL	Test Temp: 260 °C	19.5 W/(m·K)	Cleveland-Cliffs AK Steel International	VERIFIED
Thermal ConductivityCondition: H900	22.5 W/(m·K)	TYPICAL	Test Temp: 460 °C	22.5 W/(m·K)	Cleveland-Cliffs AK Steel International	VERIFIED
Thermal ConductivityCondition: H900	22.6 W/(m·K)	TYPICAL	Test Temp: 482 °C	22.6 W/(m·K)	Cleveland-Cliffs AK Steel International	VERIFIED
Coefficient of Thermal Expansion	10.8 µm/(m·K)	TYPICAL	Test Temp: 100 °C	10.8 10^-6/K	Carpenter Technology Corporation	VERIFIED
Thermal Conductivity	18.4 W/(m·K)	TYPICAL	Test Temp: 100 °C	18.4 W/(m·K)	Carpenter Technology Corporation	VERIFIED

17-4 PH (630) Stainless Steel Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

3 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Electrical ResistivityCondition: Condition A	1000 nΩ·m	TYPICAL	Test temperature not stated.	100 µΩ·cm	Cleveland-Cliffs AK Steel International	VERIFIED
Electrical ResistivityCondition: H900	800 nΩ·m	TYPICAL	Test temperature not stated.	80 µΩ·cm	Cleveland-Cliffs AK Steel International	VERIFIED
Electrical ResistivityCondition: H1075	800 nΩ·m	TYPICAL	Test temperature not stated.	80 µΩ·cm	Cleveland-Cliffs AK Steel International	VERIFIED

17-4 PH (630) Stainless Steel 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.

Product Form:

Temper / Condition:

Showing 5 of 5 conditions

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Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Bar	H900 · LONGITUDINAL · H900 Source values and qualifiers Tensile Strength: 1379 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H900 Yield Strength: 1275.5 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H900 Elongation: 14 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements. Gauge length 4D0.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H900 Reduction Of Area: 50 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H900 HB Hardness: 420 HB (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H900 HRC Hardness: 44 HRC (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H900	—	1379 MPa	1275.5 MPa	14 %	—	—	420 HB44 HRC	VERIFIED
Bar	H1025 · LONGITUDINAL · H1025 Source values and qualifiers Tensile Strength: 1172.1 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1025 Yield Strength: 1137.6 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1025 Elongation: 15 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements. Gauge length 4D0.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1025 Reduction Of Area: 56 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1025 HB Hardness: 352 HB (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1025 HRC Hardness: 38 HRC (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1025	—	1172.1 MPa	1137.6 MPa	15 %	—	—	352 HB38 HRC	VERIFIED
Bar	H1075 · LONGITUDINAL · H1075 Source values and qualifiers Tensile Strength: 1137.6 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1075 Yield Strength: 1034.2 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1075 Elongation: 16 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements. Gauge length 4D0.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1075 Reduction Of Area: 58 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1075 HB Hardness: 341 HB (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1075 HRC Hardness: 36 HRC (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1075	—	1137.6 MPa	1034.2 MPa	16 %	—	—	341 HB36 HRC	VERIFIED
Bar	H1150 · LONGITUDINAL · H1150 Source values and qualifiers Tensile Strength: 999.7 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1150 Yield Strength: 861.8 MPa (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1150 Elongation: 19 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements. Gauge length 4D0.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1150 Reduction Of Area: 60 % (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1150 HB Hardness: 311 HB (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1150 HRC Hardness: 33 HRC (TYPICAL)Typical longitudinal bar properties; section dimensions and test temperature not stated in this table. Not minimum requirements.Cleveland-Cliffs AK Steel International — printed p3, Table 2, H1150	—	999.7 MPa	861.8 MPa	19 %	—	—	311 HB33 HRC	VERIFIED
Round, hexagonal and square bar	Condition A · Solution treated Source values and qualifiers HRC Hardness: ≤ 38 HRC (MAXIMUM)Maximum hardness in Condition A; do not extrapolate across section sizes.Cleveland-Cliffs AK Steel International — printed p4, Table 4	— · 3 < t ≤ 12 mm	—	—	—	—	—	≤ 38 HRC	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

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

For 17-4 PH (630) Stainless Steel, a qualified cutting-speed or tool-life recommendation is not supplied in the available record. A relevant hardness example is HB Hardness: 420 HB (typical; H900, Bar, LONGITUDINAL). 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

No qualified weld procedure, filler selection or preheat/interpass schedule is established by this material record. Obtain a procedure for the actual joint, supplied condition and section rather than copying one from a nearby grade. The first cataloged strength example is Tensile Strength: 1379 MPa (typical; H900, Bar, LONGITUDINAL). 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

Assess chlorides, deposits, crevices, temperature and the final cleaned surface together. Stainless is not a promise of immunity to corrosion. Check weld heat tint and embedded iron where fabrication is involved, and do not turn a thermal-property test temperature into a service ceiling. The recorded thermal example is Thermal Conductivity: 17.9 W/(m·K) (typical; H900; test temperature 149 °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 C maximum 0.07 wt%, Mn maximum 1 wt%, P maximum 0.04 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

For a strength-critical precipitation-hardening part, keep the aging condition explicit on the drawing. Two rows from different aging treatments are different selection options, not interchangeable values for one unnamed final condition. The listed forms include Bar, Round, hexagonal and square bar; confirm the actual stock offered by the supplier. 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: Cleveland-Cliffs AK Steel International; Carpenter Technology Corporation

Related Engineering & Metallurgy Guides

Contextual technical guides explaining degradation mechanisms, testing methodologies, and selection criteria relevant to 17-4 PH (630) Stainless Steel.

Corrosion & Surface Engineering16 min read

How to Polish Stainless Steel: Methods, Scratch Removal, Finishes & Grain Direction

Stainless steel owes its corrosion resistance to a microscopic, self-healing chromium oxide (Cr₂O₃) passive film. Polishing stainless steel is not merely cosmetic cleaning—it is a controlled mechanical abrasion process requiring strict adherence to grain direction, progressive abrasive refinement, and rigorous cross-contamination control to preserve surface integrity and corrosion performance.

Author: Mat Grades Editorial DeskRead Guide →

Sources

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

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Carpenter Technology CorporationCarpenter Specialty Alloys Technical Datasheets (Project 70+ 303, CarTech 52100, Custom 630 / 17-4 PH)

PRIMARY PRODUCER

Reviewed factual transcription from primary producer engineering datasheet.

Issuing Body: Carpenter Technology CorporationRevision: Carpenter Specialty Alloys Technical Bulletin 2024View Source Record ↗

Carpenter Technology CorporationCarpenter Specialty Alloys Technical Datasheets (Project 70+ 303, CarTech 52100, Custom 630 / 17-4 PH)

PRIMARY PRODUCER

Reviewed factual transcription from primary producer engineering datasheet.

Issuing Body: Carpenter Technology CorporationRevision: Carpenter Specialty Alloys Technical Bulletin 2024View Source Record ↗

Carpenter Technology CorporationCarpenter Specialty Alloys Technical Datasheets (Project 70+ 303, CarTech 52100, Custom 630 / 17-4 PH)

PRIMARY PRODUCER

Reviewed factual transcription from primary producer engineering datasheet.

Issuing Body: Carpenter Technology CorporationRevision: Carpenter Specialty Alloys Technical Bulletin 2024View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View Source Record ↗

Cleveland-Cliffs AK Steel InternationalARMCO 17-4 PH Stainless Steel Product Data Bulletin

PRIMARY PRODUCER

Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.

Issuing Body: Cleveland-Cliffs AK Steel InternationalRevision: October 2022View 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.