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Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.
ASTM A536 Grade 80-55-06 is a high-strength ductile cast iron characterized by a balanced pearlitic-ferritic matrix structure (approximately 50% pearlite and 50% ferrite). Delivering a minimum tensile strength of 80 ksi (552 MPa), minimum yield strength of 55 ksi (379 MPa), and 6% minimum elongation in the as-cast condition, it provides superior resistance to mechanical wear and cyclic bending fatigue. Extensively used for automotive crankshafts, gears, and heavy diesel engine brackets.
Source-backed commercial trade name and short designations cataloged in canonical data.
Standard Designations & Applicable Specifications — Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.
| System | Identifier | Standard System Name | Classification Notes & Provenance |
|---|---|---|---|
| ASTMPRIMARY | A536 Grade 80-55-06 | ASTM International | —Ref: Standard Specifications for Gray and Ductile Cast Iron (ASTM A48/A48M, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, ASM Handbook Vol 1) |
| UNS | F33800 | Unified Numbering System | —Ref: Standard Specifications for Gray and Ductile Cast Iron (ASTM A48/A48M, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, ASM Handbook Vol 1) |
| SAE | J434 D5506 | SAE International | —Ref: Standard Specifications for Gray and Ductile Cast Iron (ASTM A48/A48M, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, ASM Handbook Vol 1) |
| Recognized Name / Alias | Classification | Technical Usage & Context |
|---|---|---|
| Ductile Iron 80-55-06 | Commercial Alias | Colloquial or commercial industry synonym |
| Nodular Iron 80-55-06 | Commercial Alias | Colloquial or commercial industry synonym |
| Crankshaft Ductile Iron | Colloquial Alias | Colloquial or commercial industry synonym |
| Standards Body | Specification Code | Specification Title / Scope | Relationship Type |
|---|---|---|---|
| ASTM | ASTM A536 | Standard Specification for Ductile Iron Castings | Specification Reference |
| SAE | SAE J434 | Automotive Ductile (Nodular) Iron Castings (Grade D5506) | Specification Reference |
| ISO | ISO 1083 | Spheroidal graphite cast irons — Classification | Specification Reference |
Chemical Composition (Weight %) — Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).
| Element | Symbol | Atomic No. | Semantic Basis | Specified Value | Unit | Metallurgical Notes & Qualification | Data Status |
|---|---|---|---|---|---|---|---|
| Carbon | C | 0 | RANGE | 3.50 – 3.80 | wt% | Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Silicon | Si | 0 | RANGE | 2.10 – 2.70 | wt% | Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Manganese | Mn | 0 | RANGE | 0.40 – 0.75 | wt% | Higher manganese promotes pearlite stability.Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Phosphorus | P | 0 | MAXIMUM | ≤ 0.05 | wt% | Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Sulfur | S | 0 | MAXIMUM | ≤ 0.02 | wt% | Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Magnesium | Mg | 0 | RANGE | 0.04 – 0.06 | wt% | Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Copper | Cu | 0 | RANGE | 0.20 – 0.60 | wt% | Optional copper addition to stabilize pearlite.Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
| Iron | Fe | 0 | REMAINDER | Remainder | wt% | Ref: ASTM International, CEN, ISO & ASM International Standards Technical Committees | VERIFIED |
Source-specific physical properties. Test temperatures are shown only where reported.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Density | 7.15 g/cm³ | TYPICAL | 7.15 g/cm³ | ASTM International, CEN & ISO Technical Committees | VERIFIED |
Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Thermal Conductivity | 33 W/(m·K) | TYPICAL | 33 W/(m·K) | ASTM International, CEN & ISO Technical Committees | VERIFIED | |
| Specific Heat Capacity | 480 J/(kg·K) | TYPICAL | 480 J/(kg·K) | ASTM International, CEN & ISO Technical Committees | VERIFIED | |
| Coefficient of Thermal Expansion | 11.5 µm/(m·K) | TYPICAL | 11.5 µm/(m·K) | ASTM International, CEN & ISO Technical Committees | VERIFIED |
Electrical conductivity and resistivity in their reported units and conditions.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Electrical Resistivity | 580 nΩ·m | TYPICAL | 580 nΩ·m | ASTM International, CEN & ISO Technical Committees | VERIFIED |
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 | Section Size | Tensile (UTS) | Yield Strength | Elongation | Shear Strength | Fatigue Strength | Hardness (Scales Preserved) | Status |
|---|---|---|---|---|---|---|---|---|---|
| Separately cast test coupon | As-Cast or NormalizedSource values and qualifiersUltimate Tensile Strength: ≥ 552 MPa (MINIMUM)Governing minimum tensile strength per ASTM A536 Grade 80-55-06 (80 ksi = 552 MPa).ASTM International, CEN, ISO & ASM International Standards Technical Committees — ASTM A48, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, ASM Handbook Vol 1 | — | ≥ 552 MPa | — | — | — | — | — | VERIFIED |
| Standard Product Form | As-Cast or NormalizedSource values and qualifiers0.2% Offset Yield Strength: ≥ 379 MPa (MINIMUM)Governing minimum 0.2% offset yield strength per ASTM A536 (55 ksi = 379 MPa).ASTM International, CEN, ISO & ASM International Standards Technical Committees — ASTM A48, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, ASM Handbook Vol 1 Elongation at Break (50 mm): ≥ 6 % (MINIMUM)Governing minimum tensile elongation in 2 inches (50 mm) is 6.0%.ASTM International, CEN, ISO & ASM International Standards Technical Committees — ASTM A48, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, ASM Handbook Vol 1 | — | — | ≥ 379 MPa | ≥ 6 % | — | — | — | VERIFIED |
| Standard Product Form | As-Cast or NormalizedSource values and qualifiers | — | — | — | — | — | — | 187–255 HBW | VERIFIED |
Machining, joining, forming, and thermal processing ratings cataloged from the cited authoritative technical reference.
Good machinability (~70% relative to C36000 baseline). Higher pearlite content increases abrasive tool wear compared to 65-45-12.
Difficult to weld. High pearlite and carbon content cause high cracking sensitivity. Thorough preheating (250°C–350°C) and post-weld stress relief or annealing are required.
Commonly used as-cast. Normalizing from 900°C produces uniform fine pearlite and raises tensile strength toward 100 ksi.
Very limited cold forming; hot coining under controlled temperature possible.
Comparable Grades & Cross-References: Carefully classified cross-reference relationships for ASTM A536 Grade 80-55-06 Ductile Cast Iron. Comparable does not mean equivalent.
| Related Material | Family | Relationship Classification | Metallurgical Notes & Differences | Status | Action |
|---|---|---|---|---|---|
| ASTM A536 Grade 100-70-03 Ductile Cast Iron | Cast Iron | Commonly Compared | 80-55-06 provides higher elongation (6% vs 3%) in the as-cast state without thermal normalizing, while 100-70-03 achieves 25% higher tensile strength (689 vs 552 MPa) through full pearlite normalization.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost). | VERIFIED | Side-by-Side Compare → |
| EN-GJS-600-3 Ductile Cast Iron | Cast Iron | Approximate Equivalent | EN-GJS-600-3 (min 600 MPa UTS, 370 MPa YS, 3% elongation) and ASTM A536 80-55-06 (min 552 MPa UTS, 379 MPa YS, 6% elongation) address similar high-strength drivetrain components.Engineering substitution review required. Design calculations must verify temper, formability, and corrosion limits before specifying as a direct replacement. | VERIFIED | Side-by-Side Compare → |
Contextual technical guides explaining degradation mechanisms, testing methodologies, and selection criteria relevant to ASTM A536 Grade 80-55-06 Ductile Cast Iron.
Cast iron is an indispensable alloy family renowned for superior vibration damping and castability, but its iron matrix and carbon microstructure make it susceptible to atmospheric rust. Restoring rusted cast iron requires understanding how mechanical and chemical methods interact with the underlying metal.
Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.
Authoritative foundry data harmonized across ASTM A48, ASTM A536, EN 1561, EN 1563, ISO 185, ISO 1083, SAE J431, SAE J434, and ASM International Handbook Volume 1 (Properties and Selection: Irons, Steels, and High-Performance Alloys).