ASTM A387 Grade 21 Steel vs. S66286 Stainless Steel
Both ASTM A387 grade 21 steel and S66286 stainless steel are iron alloys. They have 59% 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 21 steel and the bottom bar is S66286 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 17 to 40 |
| Fatigue Strength, MPa | 160 to 250 | |
| 240 to 410 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 75 |
| Shear Strength, MPa | 310 to 370 | |
| 420 to 630 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 620 to 1020 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 280 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 920 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1430 |
| Melting Onset (Solidus), °C | 1430 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 2.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 26 |
| Density, g/cm3 | 7.9 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 6.0 |
| Embodied Energy, MJ/kg | 23 | |
| 87 |
| Embodied Water, L/kg | 62 | |
| 170 |
Common Calculations
| PREN (Pitting Resistance) | 6.4 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 150 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 190 to 1150 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 22 to 36 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 20 to 28 |
| Thermal Diffusivity, mm2/s | 11 | |
| 4.0 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 13 to 22 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.35 |
| Boron (B), % | 0 | |
| 0.0010 to 0.010 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0 to 0.080 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 13.5 to 16 |
| Iron (Fe), % | 94.4 to 96 | |
| 49.1 to 59.5 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 1.0 to 1.5 |
| Nickel (Ni), % | 0 | |
| 24 to 27 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 1.9 to 2.4 |
| Vanadium (V), % | 0 | |
| 0.1 to 0.5 |