ASTM A387 Grade 21 Class 1 vs. Annealed AISI 205
Both ASTM A387 grade 21 class 1 and annealed AISI 205 are iron alloys. Both are furnished in the annealed condition. 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 (7, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 21 class 1 and the bottom bar is annealed AISI 205.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 | |
| 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 | |
| 45 |
| Fatigue Strength, MPa | 160 | |
| 410 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 74 | |
| 77 |
| Shear Strength, MPa | 310 | |
| 560 |
| Tensile Strength: Ultimate (UTS), MPa | 500 | |
| 800 |
| Tensile Strength: Yield (Proof), MPa | 230 | |
| 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 880 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1380 |
| Melting Onset (Solidus), °C | 1430 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Expansion, µm/m-K | 13 | |
| 18 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 11 |
| Density, g/cm3 | 7.9 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 2.6 |
| Embodied Energy, MJ/kg | 23 | |
| 37 |
| Embodied Water, L/kg | 62 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 6.4 | |
| 23 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 | |
| 300 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 26 |
| Strength to Weight: Axial, points | 18 | |
| 29 |
| Strength to Weight: Bending, points | 18 | |
| 25 |
| Thermal Shock Resistance, points | 14 | |
| 16 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.15 | |
| 0.12 to 0.25 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 16.5 to 18.5 |
| Iron (Fe), % | 94.4 to 96 | |
| 62.6 to 68.1 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 14 to 15.5 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 1.0 to 1.7 |
| Nitrogen (N), % | 0 | |
| 0.32 to 0.4 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.030 |