Verified Curated Comparison Pairs:Source-Qualified
Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
Material A (Baseline)
Material B (Comparison)
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Temper & Metallurgical Context Qualification:The selected records contain different or missing source contexts. Values shown in separate rows are not directly matched. Typical and estimated values are not guaranteed minima; matching context alone does not establish interchangeability.
1. Identity, Classification & Standards
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| Parameter | ASTM A536 Grade 120-90-02 Ductile Cast Iron | SAE 4140 Alloy Steel |
|---|---|---|
| Material Family | Cast Iron | Steel |
| Subfamily | Ductile (Nodular) Iron | Alloy Steel |
| ASTM Designation | A536 Grade 120-90-02 | — |
| UNS Designation | F36200 | — |
| SAE Designation | J434 D9002 | 4140 |
| AISI Designation | — | 4140 |
| SPECIFICATION Designation | — | SAE 4140 Alloy Steel Engineering Datasheet |
2. Chemical Composition Limits (wt %)Source-specific limits and typical values
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| Element | ASTM A536 Grade 120-90-02 Ductile Cast Iron | SAE 4140 Alloy Steel |
|---|---|---|
| C (Carbon) | 3.4 – 3.7% | 0.38 – 0.43% |
| Si (Silicon) | 2 – 2.5% | 0.15 – 0.35% |
| Mn (Manganese) | 0.5 – 0.9% | 0.75 – 1% |
| P (Phosphorus) | ≤ 0.04% | ≤ 0.035% |
| S (Sulfur) | ≤ 0.02% | ≤ 0.04% |
| Mg (Magnesium) | 0.035 – 0.06% | — |
| Mo (Molybdenum) | 0.2 – 0.5% | 0.15 – 0.25% |
| Fe (Iron) | — | — |
| Cr (Chromium) | — | 0.8 – 1.1% |
| Ni (Nickel) | — | ≤ 0.25% |
3. Physical Properties
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| Property | ASTM A536 Grade 120-90-02 Ductile Cast Iron | SAE 4140 Alloy Steel |
|---|---|---|
| Density · TYPICALUnit: g/cm³ | 7.15 g/cm³ | 7.85 g/cm³ |
| Elastic Modulus · TYPICALUnit: GPa | — GPa | 205 GPa |
4. Contextual Mechanical PropertiesUnit: SI
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| Mechanical Parameter | ASTM A536 Grade 120-90-02 Ductile Cast IronTypical: Quenched and Tempered (Martensitic-Bainitic Matrix, ASTM A536 Note 2) | SAE 4140 Alloy SteelQuenched and tempered (voestalpine supply) |
|---|---|---|
| Poisson Ratio · TYPICALUnit: dimensionless | 0.28 dimensionless | 0.29 dimensionless |
| Tensile Strength · Bar · 10–100 mm · Quenched and tempered (voestalpine supply) · RANGEUnit: MPa | — MPa | 930–1080 MPa |
| Tensile Strength · Bar · 101–250 mm · Quenched and tempered (voestalpine supply) · RANGEUnit: MPa | — MPa | 850–1000 MPa |
| Yield Strength · Bar · 10–100 mm · Quenched and tempered (voestalpine supply) · MINIMUMUnit: MPa | — MPa | ≥ 740 MPa |
| Yield Strength · Bar · 101–250 mm · Quenched and tempered (voestalpine supply) · MINIMUMUnit: MPa | — MPa | ≥ 665 MPa |
| Elongation · Bar · 10–100 mm · Quenched and tempered (voestalpine supply) · MINIMUMUnit: % | — % | ≥ 12 % |
| Elongation · Bar · 101–250 mm · Quenched and tempered (voestalpine supply) · MINIMUMUnit: % | — % | ≥ 13 % |
5. Electrical & Thermal Conductive Properties
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| Property | ASTM A536 Grade 120-90-02 Ductile Cast Iron | SAE 4140 Alloy Steel |
|---|---|---|
| Electrical Resistivity · TYPICALCategory: ELECTRICAL • Unit: nΩ·m | 620 nΩ·m | — nΩ·m |
| Thermal Conductivity · TYPICALCategory: THERMAL • Unit: W/(m·K) | 28 W/(m·K) | — W/(m·K) |
| Thermal Conductivity · TYPICAL · 100 °CCategory: THERMAL • Unit: W/(m·K) | — W/(m·K) | 42.6 W/(m·K) |
| Specific Heat Capacity · TYPICALCategory: THERMAL • Unit: J/(kg·K) | 500 J/(kg·K) | — J/(kg·K) |
| Coefficient of Thermal Expansion · TYPICALCategory: THERMAL • Unit: µm/(m·K) | 11 µm/(m·K) | — µm/(m·K) |
| Coefficient of Thermal Expansion · TYPICAL · 100 °CCategory: THERMAL • Unit: µm/(m·K) | — µm/(m·K) | 12.2 µm/(m·K) |
6. Hardness Evaluation (Discrete Scales Preserved)No cross-scale mathematical conversion
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| Hardness Scale | ASTM A536 Grade 120-90-02 Ductile Cast Iron | SAE 4140 Alloy Steel |
|---|---|---|
| HB Hardness · Bar · 10–100 mm · Quenched and tempered (voestalpine supply) · RANGE | — | 269–331 HB |
| HB Hardness · Bar · 101–250 mm · Quenched and tempered (voestalpine supply) · RANGE | — | 248–302 HB |
7. Fabrication & Processing Comparison
ASTM A536 Grade 120-90-02 Ductile Cast Iron Characteristics:
Machinability: Difficult machinability (~45% of C36000 baseline). Pre-machining is typically performed in the normalized or annealed state, followed by quench-and-temper and final grinding.
Weldability: Unweldable for structural applications. Quench-and-temper matrix creates extreme cracking risk under fusion welding.
Formability / Cold Working: Non-deformable.
Heat Treatment & Annealing: Quenched and tempered: austenitize at 870°C–900°C (1600°F–1650°F), oil quench with vigorous agitation, temper at 540°C–595°C (1000°F–1100°F) for 2 hours.
SAE 4140 Alloy Steel Characteristics: