ASTM A387 Grade 9 Steel vs. EN 1.7725 Steel
Both ASTM A387 grade 9 steel and EN 1.7725 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 9 steel and the bottom bar is EN 1.7725 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 250 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 20 to 21 | |
| 14 |
| Fatigue Strength, MPa | 160 to 240 | |
| 390 to 550 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 600 | |
| 830 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 610 to 860 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 600 | |
| 440 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 26 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 9.0 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 6.5 | |
| 2.9 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.1 | |
| 1.8 |
| Embodied Energy, MJ/kg | 28 | |
| 24 |
| Embodied Water, L/kg | 87 | |
| 54 |
Common Calculations
| PREN (Pitting Resistance) | 12 | |
| 2.8 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 83 to 110 | |
| 110 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 310 | |
| 980 to 1940 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 29 to 35 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 25 to 28 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 11 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 24 to 29 |
Alloy Composition
| Carbon (C), % | 0 to 0.15 | |
| 0.27 to 0.34 |
| Chromium (Cr), % | 8.0 to 10 | |
| 1.3 to 1.7 |
| Iron (Fe), % | 87.1 to 90.8 | |
| 95.7 to 97.5 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 0.3 to 0.5 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 to 0.040 | |
| 0.050 to 0.15 |