ASTM A387 Grade 21 Steel vs. Nickel 685
ASTM A387 grade 21 steel belongs to the iron alloys classification, while nickel 685 belongs to the nickel alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is nickel 685.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 | |
| 17 |
| Fatigue Strength, MPa | 160 to 250 | |
| 470 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 77 |
| Shear Strength, MPa | 310 to 370 | |
| 770 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 1250 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 1000 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1380 |
| Melting Onset (Solidus), °C | 1430 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 460 |
| Thermal Conductivity, W/m-K | 41 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 75 |
| Density, g/cm3 | 7.9 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 10 |
| Embodied Energy, MJ/kg | 23 | |
| 140 |
| Embodied Water, L/kg | 62 | |
| 340 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 1820 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 42 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 31 |
| Thermal Diffusivity, mm2/s | 11 | |
| 3.3 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 37 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 1.2 to 1.6 |
| Boron (B), % | 0 | |
| 0.0030 to 0.010 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0.030 to 0.1 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 18 to 21 |
| Cobalt (Co), % | 0 | |
| 12 to 15 |
| Copper (Cu), % | 0 | |
| 0 to 0.5 |
| Iron (Fe), % | 94.4 to 96 | |
| 0 to 2.0 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 3.5 to 5.0 |
| Nickel (Ni), % | 0 | |
| 49.6 to 62.5 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 2.8 to 3.3 |
| Zinc (Zn), % | 0 | |
| 0.020 to 0.12 |