ASTM A372 Grade M Steel vs. ASTM A387 Grade 12 Steel
Both ASTM A372 grade M steel and ASTM A387 grade 12 steel are iron alloys. They have a very high 96% of their average alloy composition in common.
For each property being compared, the top bar is ASTM A372 grade M steel and the bottom bar is ASTM A387 grade 12 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 240 to 280 | |
| 140 to 160 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 18 to 21 | |
| 25 |
| Fatigue Strength, MPa | 450 to 520 | |
| 190 to 230 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 510 to 570 | |
| 300 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 810 to 910 | |
| 470 to 520 |
| Tensile Strength: Yield (Proof), MPa | 660 to 770 | |
| 260 to 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 450 | |
| 430 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 46 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.0 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 5.0 | |
| 2.8 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.0 | |
| 1.6 |
| Embodied Energy, MJ/kg | 27 | |
| 21 |
| Embodied Water, L/kg | 61 | |
| 51 |
Common Calculations
| PREN (Pitting Resistance) | 3.4 | |
| 2.7 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 | |
| 98 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1140 to 1580 | |
| 180 to 250 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 29 to 32 | |
| 16 to 18 |
| Strength to Weight: Bending, points | 24 to 27 | |
| 17 to 18 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 24 to 27 | |
| 14 to 15 |
Alloy Composition
| Carbon (C), % | 0 to 0.23 | |
| 0.050 to 0.17 |
| Chromium (Cr), % | 1.5 to 2.0 | |
| 0.8 to 1.2 |
| Iron (Fe), % | 92.5 to 95.1 | |
| 97 to 98.2 |
| Manganese (Mn), % | 0.2 to 0.4 | |
| 0.4 to 0.65 |
| Molybdenum (Mo), % | 0.4 to 0.6 | |
| 0.45 to 0.6 |
| Nickel (Ni), % | 2.8 to 3.9 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.3 | |
| 0.15 to 0.4 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.025 |
| Vanadium (V), % | 0 to 0.080 | |
| 0 |