ASTM A387 Grade 21 Steel vs. EN 1.4938 Stainless Steel
Both ASTM A387 grade 21 steel and EN 1.4938 stainless steel are iron alloys. They have 88% 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 21 steel and the bottom bar is EN 1.4938 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 | |
| 16 to 17 |
| Fatigue Strength, MPa | 160 to 250 | |
| 390 to 520 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 74 | |
| 76 |
| Shear Strength, MPa | 310 to 370 | |
| 540 to 630 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 870 to 1030 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 640 to 870 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 750 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1430 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 30 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 3.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 10 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 3.3 |
| Embodied Energy, MJ/kg | 23 | |
| 47 |
| Embodied Water, L/kg | 62 | |
| 110 |
Common Calculations
| PREN (Pitting Resistance) | 6.4 | |
| 18 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 140 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 1050 to 1920 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 31 to 37 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 26 to 29 |
| Thermal Diffusivity, mm2/s | 11 | |
| 8.1 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 30 to 35 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.15 | |
| 0.080 to 0.15 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 11 to 12.5 |
| Iron (Fe), % | 94.4 to 96 | |
| 80.5 to 84.8 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.4 to 0.9 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 1.5 to 2.0 |
| Nickel (Ni), % | 0 | |
| 2.0 to 3.0 |
| Nitrogen (N), % | 0 | |
| 0.020 to 0.040 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.015 |
| Vanadium (V), % | 0 | |
| 0.25 to 0.4 |