AISI 205 Stainless Steel vs. ASTM A387 Grade 21 Steel
Both AISI 205 stainless steel and ASTM A387 grade 21 steel are iron alloys. They have 69% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is AISI 205 stainless steel and the bottom bar is ASTM A387 grade 21 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 440 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 11 to 51 | |
| 21 |
| Fatigue Strength, MPa | 410 to 640 | |
| 160 to 250 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 74 |
| Shear Strength, MPa | 560 to 850 | |
| 310 to 370 |
| Tensile Strength: Ultimate (UTS), MPa | 800 to 1430 | |
| 500 to 590 |
| Tensile Strength: Yield (Proof), MPa | 450 to 1100 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 880 | |
| 480 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1470 |
| Melting Onset (Solidus), °C | 1340 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Expansion, µm/m-K | 18 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 4.1 |
| Density, g/cm3 | 7.6 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 1.8 |
| Embodied Energy, MJ/kg | 37 | |
| 23 |
| Embodied Water, L/kg | 150 | |
| 62 |
Common Calculations
| PREN (Pitting Resistance) | 23 | |
| 6.4 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 150 to 430 | |
| 84 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 to 3060 | |
| 140 to 320 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 26 | |
| 24 |
| Strength to Weight: Axial, points | 29 to 52 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 18 to 20 |
| Thermal Shock Resistance, points | 16 to 29 | |
| 14 to 17 |
Alloy Composition
| Carbon (C), % | 0.12 to 0.25 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 16.5 to 18.5 | |
| 2.8 to 3.3 |
| Iron (Fe), % | 62.6 to 68.1 | |
| 94.4 to 96 |
| Manganese (Mn), % | 14 to 15.5 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 1.0 to 1.7 | |
| 0 |
| Nitrogen (N), % | 0.32 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.025 |