ASTM A387 Grade 21 Steel vs. S17600 Stainless Steel
Both ASTM A387 grade 21 steel and S17600 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, 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 S17600 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 270 to 410 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 | |
| 8.6 to 11 |
| Fatigue Strength, MPa | 160 to 250 | |
| 300 to 680 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 74 | |
| 76 |
| Shear Strength, MPa | 310 to 370 | |
| 560 to 880 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 940 to 1490 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 580 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 890 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1430 |
| Melting Onset (Solidus), °C | 1430 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 41 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 13 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 2.9 |
| Embodied Energy, MJ/kg | 23 | |
| 42 |
| Embodied Water, L/kg | 62 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 6.4 | |
| 17 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 70 to 150 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 850 to 4390 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 34 to 54 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 28 to 37 |
| Thermal Diffusivity, mm2/s | 11 | |
| 4.1 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 31 to 50 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.4 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0 to 0.080 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 16 to 17.5 |
| Iron (Fe), % | 94.4 to 96 | |
| 71.3 to 77.6 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 6.0 to 7.5 |
| 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 | |
| 0.4 to 1.2 |