EN 1.4740 Stainless Steel vs. ASTM A387 Grade 21 Steel
Both EN 1.4740 stainless steel and ASTM A387 grade 21 steel are iron alloys. They have 83% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is EN 1.4740 stainless steel and the bottom bar is ASTM A387 grade 21 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 260 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 22 | |
| 21 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 74 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 900 | |
| 480 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1470 |
| Melting Onset (Solidus), °C | 1370 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 470 |
| Thermal Conductivity, W/m-K | 18 | |
| 41 |
| Thermal Expansion, µm/m-K | 10 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.2 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 4.1 |
| Density, g/cm3 | 7.6 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 1.8 |
| Embodied Energy, MJ/kg | 32 | |
| 23 |
| Embodied Water, L/kg | 120 | |
| 62 |
Common Calculations
| PREN (Pitting Resistance) | 18 | |
| 6.4 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Thermal Diffusivity, mm2/s | 4.8 | |
| 11 |
Alloy Composition
| Carbon (C), % | 0.3 to 0.5 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 16 to 19 | |
| 2.8 to 3.3 |
| Iron (Fe), % | 75.4 to 82.7 | |
| 94.4 to 96 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 1.0 to 2.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.025 |