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