ASTM A571 Type D-2M Class 1 vs. ASTM A571 Type D-2M Class 2
Both ASTM A571 type D-2M class 1 and ASTM A571 type D-2M class 2 are variants of the same material. They share alloy composition and many physical properties, but develop different mechanical properties as a result of different processing.
For each property being compared, the top bar is ASTM A571 type D-2M class 1 and the bottom bar is ASTM A571 type D-2M class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 | |
| 140 |
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 180 |
| Elongation at Break, % | 34 | |
| 29 |
| Impact Strength: V-Notched Charpy, J | 22 | |
| 31 |
| Poisson's Ratio | 0.3 | |
| 0.3 |
| Shear Modulus, GPa | 70 | |
| 70 |
| Tensile Strength: Ultimate (UTS), MPa | 500 | |
| 470 |
| Tensile Strength: Yield (Proof), MPa | 230 | |
| 190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Melting Completion (Liquidus), °C | 1370 | |
| 1370 |
| Melting Onset (Solidus), °C | 1330 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Expansion, µm/m-K | 14 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 16 | |
| 16 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.7 | |
| 3.7 |
| Embodied Energy, MJ/kg | 51 | |
| 51 |
| Embodied Water, L/kg | 94 | |
| 94 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 | |
| 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
| 100 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 | |
| 17 |
| Strength to Weight: Bending, points | 18 | |
| 17 |
| Thermal Shock Resistance, points | 15 | |
| 14 |
Alloy Composition
| Carbon (C), % | 2.2 to 2.9 | |
| 2.2 to 2.9 |
| Chromium (Cr), % | 0 to 0.2 | |
| 0 to 0.2 |
| Iron (Fe), % | 65.8 to 71.6 | |
| 65.8 to 71.6 |
| Manganese (Mn), % | 3.8 to 4.5 | |
| 3.8 to 4.5 |
| Nickel (Ni), % | 21 to 24 | |
| 21 to 24 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 to 0.080 |
| Silicon (Si), % | 1.5 to 2.5 | |
| 1.5 to 2.5 |