ASTM A387 Grade 91 Class 2 vs. EN 1.4021 Stainless Steel
Both ASTM A387 grade 91 class 2 and EN 1.4021 stainless steel are iron alloys. They have a very high 95% 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 91 class 2 and the bottom bar is EN 1.4021 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 20 | |
| 11 to 17 |
| Fatigue Strength, MPa | 330 | |
| 240 to 380 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 75 | |
| 76 |
| Shear Strength, MPa | 420 | |
| 390 to 530 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 630 to 880 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 390 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 600 | |
| 760 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 26 | |
| 30 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 3.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 7.0 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 1.9 |
| Embodied Energy, MJ/kg | 37 | |
| 27 |
| Embodied Water, L/kg | 88 | |
| 100 |
Common Calculations
| PREN (Pitting Resistance) | 13 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 88 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 | |
| 400 to 1160 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 | |
| 23 to 31 |
| Strength to Weight: Bending, points | 22 | |
| 21 to 26 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 8.1 |
| Thermal Shock Resistance, points | 19 | |
| 22 to 31 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0.16 to 0.25 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 12 to 14 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 83.2 to 87.8 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 0 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 |