EN 1.6580 Steel vs. ASTM A387 Grade 21 Steel
Both EN 1.6580 steel and ASTM A387 grade 21 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 EN 1.6580 steel and the bottom bar is ASTM A387 grade 21 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 to 350 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 19 | |
| 21 |
| Fatigue Strength, MPa | 310 to 610 | |
| 160 to 250 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 450 to 700 | |
| 310 to 370 |
| Tensile Strength: Ultimate (UTS), MPa | 720 to 1170 | |
| 500 to 590 |
| Tensile Strength: Yield (Proof), MPa | 460 to 990 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 450 | |
| 480 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 40 | |
| 41 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.3 | |
| 4.1 |
| Density, g/cm3 | 7.9 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.8 |
| Embodied Energy, MJ/kg | 23 | |
| 23 |
| Embodied Water, L/kg | 59 | |
| 62 |
Common Calculations
| PREN (Pitting Resistance) | 3.3 | |
| 6.4 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 to 130 | |
| 84 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 2590 | |
| 140 to 320 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 41 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 23 to 31 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 11 | |
| 11 |
| Thermal Shock Resistance, points | 21 to 34 | |
| 14 to 17 |
Alloy Composition
| Carbon (C), % | 0.26 to 0.34 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 1.8 to 2.2 | |
| 2.8 to 3.3 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 94.4 to 96 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0.3 to 0.5 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 1.8 to 2.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.025 |