EN 1.6580 Steel vs. ASTM A387 Grade 91 Class 2
Both EN 1.6580 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 92% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.6580 steel and the bottom bar is ASTM A387 grade 91 class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 to 350 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 19 | |
| 20 |
| Fatigue Strength, MPa | 310 to 610 | |
| 330 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 75 |
| Shear Strength, MPa | 450 to 700 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 720 to 1170 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 460 to 990 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 450 | |
| 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 | 40 | |
| 26 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 8.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.3 | |
| 7.0 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 2.6 |
| Embodied Energy, MJ/kg | 23 | |
| 37 |
| Embodied Water, L/kg | 59 | |
| 88 |
Common Calculations
| PREN (Pitting Resistance) | 3.3 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 to 130 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 2590 | |
| 580 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 26 to 41 | |
| 24 |
| Strength to Weight: Bending, points | 23 to 31 | |
| 22 |
| Thermal Diffusivity, mm2/s | 11 | |
| 6.9 |
| Thermal Shock Resistance, points | 21 to 34 | |
| 19 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.020 |
| Carbon (C), % | 0.26 to 0.34 | |
| 0.080 to 0.12 |
| Chromium (Cr), % | 1.8 to 2.2 | |
| 8.0 to 9.5 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 87.3 to 90.3 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0.3 to 0.5 | |
| 0.85 to 1.1 |
| Nickel (Ni), % | 1.8 to 2.2 | |
| 0 to 0.4 |
| Niobium (Nb), % | 0 | |
| 0.060 to 0.1 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.070 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 0.4 | |
| 0.2 to 0.5 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Vanadium (V), % | 0 | |
| 0.18 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.010 |