ASTM A242 HSLA Steel vs. ASTM A372 Grade D Steel
Both ASTM A242 HSLA steel and ASTM A372 grade D steel are iron alloys. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is ASTM A242 HSLA steel and the bottom bar is ASTM A372 grade D steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 | |
| 250 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 22 | |
| 17 |
| Fatigue Strength, MPa | 230 | |
| 340 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 310 | |
| 500 |
| Tensile Strength: Ultimate (UTS), MPa | 490 | |
| 810 |
| Tensile Strength: Yield (Proof), MPa | 330 | |
| 510 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 400 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 52 | |
| 51 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.1 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.1 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 2.1 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.5 |
| Embodied Energy, MJ/kg | 18 | |
| 20 |
| Embodied Water, L/kg | 46 | |
| 48 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 95 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 290 | |
| 700 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 17 | |
| 29 |
| Strength to Weight: Bending, points | 17 | |
| 25 |
| Thermal Diffusivity, mm2/s | 14 | |
| 14 |
| Thermal Shock Resistance, points | 14 | |
| 26 |
Alloy Composition
| Carbon (C), % | 0 to 0.15 | |
| 0.4 to 0.5 |
| Copper (Cu), % | 0.2 to 0.45 | |
| 0 |
| Iron (Fe), % | 98.2 to 99.8 | |
| 97.1 to 97.9 |
| Manganese (Mn), % | 0 to 1.0 | |
| 1.4 to 1.8 |
| Molybdenum (Mo), % | 0 | |
| 0.17 to 0.27 |
| Phosphorus (P), % | 0 to 0.15 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.010 |