S21800 Stainless Steel vs. ASTM A387 Grade 91 Class 2
Both S21800 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 72% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is S21800 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 40 | |
| 20 |
| Fatigue Strength, MPa | 330 | |
| 330 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 75 | |
| 75 |
| Shear Strength, MPa | 510 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 740 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 340 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 900 | |
| 600 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1460 |
| Melting Onset (Solidus), °C | 1310 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 470 |
| Thermal Expansion, µm/m-K | 16 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 7.0 |
| Density, g/cm3 | 7.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.1 | |
| 2.6 |
| Embodied Energy, MJ/kg | 45 | |
| 37 |
| Embodied Water, L/kg | 150 | |
| 88 |
Common Calculations
| PREN (Pitting Resistance) | 19 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 250 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 | |
| 580 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 26 | |
| 25 |
| Strength to Weight: Axial, points | 27 | |
| 24 |
| Strength to Weight: Bending, points | 24 | |
| 22 |
| Thermal Shock Resistance, points | 17 | |
| 19 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.020 |
| Carbon (C), % | 0 to 0.1 | |
| 0.080 to 0.12 |
| Chromium (Cr), % | 16 to 18 | |
| 8.0 to 9.5 |
| Iron (Fe), % | 59.1 to 65.4 | |
| 87.3 to 90.3 |
| Manganese (Mn), % | 7.0 to 9.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.85 to 1.1 |
| Nickel (Ni), % | 8.0 to 9.0 | |
| 0 to 0.4 |
| Niobium (Nb), % | 0 | |
| 0.060 to 0.1 |
| Nitrogen (N), % | 0.080 to 0.18 | |
| 0.030 to 0.070 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 to 0.020 |
| Silicon (Si), % | 3.5 to 4.5 | |
| 0.2 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Vanadium (V), % | 0 | |
| 0.18 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.010 |