ASTM A387 Grade 21 Steel vs. S17400 Stainless Steel
Both ASTM A387 grade 21 steel and S17400 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 (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 S17400 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 150 to 180 | |
280 to 440 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 21 | |
11 to 21 |
Fatigue Strength, MPa | 160 to 250 | |
380 to 670 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 74 | |
75 |
Shear Strength, MPa | 310 to 370 | |
570 to 830 |
Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
910 to 1390 |
Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
580 to 1250 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
280 |
Maximum Temperature: Mechanical, °C | 480 | |
850 |
Melting Completion (Liquidus), °C | 1470 | |
1440 |
Melting Onset (Solidus), °C | 1430 | |
1400 |
Specific Heat Capacity, J/kg-K | 470 | |
480 |
Thermal Conductivity, W/m-K | 41 | |
17 |
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 | |
2.6 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 4.1 | |
14 |
Density, g/cm3 | 7.9 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.8 | |
2.7 |
Embodied Energy, MJ/kg | 23 | |
39 |
Embodied Water, L/kg | 62 | |
130 |
Common Calculations
PREN (Pitting Resistance) | 6.4 | |
16 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
140 to 160 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
880 to 4060 |
Stiffness to Weight: Axial, points | 13 | |
14 |
Stiffness to Weight: Bending, points | 24 | |
25 |
Strength to Weight: Axial, points | 18 to 21 | |
32 to 49 |
Strength to Weight: Bending, points | 18 to 20 | |
27 to 35 |
Thermal Diffusivity, mm2/s | 11 | |
4.5 |
Thermal Shock Resistance, points | 14 to 17 | |
30 to 46 |
Alloy Composition
Carbon (C), % | 0.050 to 0.15 | |
0 to 0.070 |
Chromium (Cr), % | 2.8 to 3.3 | |
15 to 17 |
Copper (Cu), % | 0 | |
3.0 to 5.0 |
Iron (Fe), % | 94.4 to 96 | |
70.4 to 78.9 |
Manganese (Mn), % | 0.3 to 0.6 | |
0 to 1.0 |
Molybdenum (Mo), % | 0.9 to 1.1 | |
0 |
Nickel (Ni), % | 0 | |
3.0 to 5.0 |
Niobium (Nb), % | 0 | |
0.15 to 0.45 |
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 |