EN 1.4031 Stainless Steel vs. EN 1.4938 Stainless Steel
Both EN 1.4031 stainless steel and EN 1.4938 stainless steel are iron alloys. They have a very high 95% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.4031 stainless 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, % | 11 to 13 | |
| 16 to 17 |
| Fatigue Strength, MPa | 220 to 400 | |
| 390 to 520 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 76 | |
| 76 |
| Shear Strength, MPa | 400 to 540 | |
| 540 to 630 |
| Tensile Strength: Ultimate (UTS), MPa | 670 to 900 | |
| 870 to 1030 |
| Tensile Strength: Yield (Proof), MPa | 390 to 730 | |
| 640 to 870 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 270 |
| Maximum Temperature: Corrosion, °C | 390 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 770 | |
| 750 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1460 |
| Melting Onset (Solidus), °C | 1400 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 30 | |
| 30 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 3.1 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.7 | |
| 3.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 10 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 3.3 |
| Embodied Energy, MJ/kg | 27 | |
| 47 |
| Embodied Water, L/kg | 100 | |
| 110 |
Common Calculations
| PREN (Pitting Resistance) | 14 | |
| 18 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 94 | |
| 140 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 1360 | |
| 1050 to 1920 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 32 | |
| 31 to 37 |
| Strength to Weight: Bending, points | 22 to 27 | |
| 26 to 29 |
| Thermal Diffusivity, mm2/s | 8.1 | |
| 8.1 |
| Thermal Shock Resistance, points | 23 to 32 | |
| 30 to 35 |
Alloy Composition
| Carbon (C), % | 0.36 to 0.42 | |
| 0.080 to 0.15 |
| Chromium (Cr), % | 12.5 to 14.5 | |
| 11 to 12.5 |
| Iron (Fe), % | 83 to 87.1 | |
| 80.5 to 84.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.4 to 0.9 |
| Molybdenum (Mo), % | 0 | |
| 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 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Vanadium (V), % | 0 | |
| 0.25 to 0.4 |