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 |