SAE-AISI 9255 Steel vs. ASTM A242 HSLA Steel
Both SAE-AISI 9255 steel and ASTM A242 HSLA steel are iron alloys. They have a very high 97% of their average alloy composition in common.
For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is ASTM A242 HSLA steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 | |
| 150 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 22 |
| Fatigue Strength, MPa | 270 | |
| 230 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Shear Strength, MPa | 430 | |
| 310 |
| Tensile Strength: Ultimate (UTS), MPa | 680 | |
| 490 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 330 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 400 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1460 |
| Melting Onset (Solidus), °C | 1390 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 46 | |
| 52 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.1 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.0 | |
| 1.9 |
| Density, g/cm3 | 7.7 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.4 |
| Embodied Energy, MJ/kg | 20 | |
| 18 |
| Embodied Water, L/kg | 46 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 95 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 400 | |
| 290 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 24 | |
| 17 |
| Strength to Weight: Bending, points | 22 | |
| 17 |
| Thermal Diffusivity, mm2/s | 13 | |
| 14 |
| Thermal Shock Resistance, points | 21 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0.51 to 0.59 | |
| 0 to 0.15 |
| Copper (Cu), % | 0 | |
| 0.2 to 0.45 |
| Iron (Fe), % | 96.2 to 97 | |
| 98.2 to 99.8 |
| Manganese (Mn), % | 0.7 to 1.0 | |
| 0 to 1.0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.15 |
| Silicon (Si), % | 1.8 to 2.2 | |
| 0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.050 |