EN 1.7711 Steel vs. ASTM A387 Grade 91 Class 2
Both EN 1.7711 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.7711 steel and the bottom bar is ASTM A387 grade 91 class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 280 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 16 to 22 | |
| 20 |
| Fatigue Strength, MPa | 290 to 520 | |
| 330 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 75 |
| Shear Strength, MPa | 440 to 570 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 930 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 400 to 800 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 600 |
| 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 | 33 | |
| 26 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 8.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.0 | |
| 7.0 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 2.6 |
| Embodied Energy, MJ/kg | 32 | |
| 37 |
| Embodied Water, L/kg | 54 | |
| 88 |
Common Calculations
| PREN (Pitting Resistance) | 2.9 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 140 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 430 to 1690 | |
| 580 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 33 | |
| 24 |
| Strength to Weight: Bending, points | 22 to 27 | |
| 22 |
| Thermal Diffusivity, mm2/s | 8.9 | |
| 6.9 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 19 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.015 | |
| 0 to 0.020 |
| Carbon (C), % | 0.36 to 0.44 | |
| 0.080 to 0.12 |
| Chromium (Cr), % | 0.9 to 1.2 | |
| 8.0 to 9.5 |
| Iron (Fe), % | 96 to 97.5 | |
| 87.3 to 90.3 |
| Manganese (Mn), % | 0.45 to 0.85 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0.5 to 0.65 | |
| 0.85 to 1.1 |
| Nickel (Ni), % | 0 | |
| 0 to 0.4 |
| Niobium (Nb), % | 0 | |
| 0.060 to 0.1 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.070 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 0.4 | |
| 0.2 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Vanadium (V), % | 0.25 to 0.35 | |
| 0.18 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.010 |