S21904 Stainless Steel vs. ACI-ASTM CB7Cu-2 Steel
Both S21904 stainless steel and ACI-ASTM CB7Cu-2 steel are iron alloys. They have 84% of their average alloy composition in common. There are 30 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 S21904 stainless steel and the bottom bar is ACI-ASTM CB7Cu-2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 300 | |
| 300 to 420 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 17 to 51 | |
| 5.7 to 11 |
| Fatigue Strength, MPa | 380 to 550 | |
| 420 to 590 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 700 to 1000 | |
| 960 to 1350 |
| Tensile Strength: Yield (Proof), MPa | 390 to 910 | |
| 760 to 1180 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 280 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1430 |
| Melting Onset (Solidus), °C | 1350 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 14 | |
| 17 |
| Thermal Expansion, µm/m-K | 17 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 2.1 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 2.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 13 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 2.6 |
| Embodied Energy, MJ/kg | 43 | |
| 38 |
| Embodied Water, L/kg | 160 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 25 | |
| 15 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 310 | |
| 71 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 2070 | |
| 1510 to 3600 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 25 to 36 | |
| 34 to 48 |
| Strength to Weight: Bending, points | 23 to 29 | |
| 28 to 35 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.6 |
| Thermal Shock Resistance, points | 15 to 21 | |
| 32 to 45 |
Alloy Composition
| Carbon (C), % | 0 to 0.040 | |
| 0 to 0.070 |
| Chromium (Cr), % | 19 to 21.5 | |
| 14 to 15.5 |
| Copper (Cu), % | 0 | |
| 2.5 to 3.2 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 73.6 to 79 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0 to 0.7 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 4.5 to 5.5 |
| Niobium (Nb), % | 0 | |
| 0 to 0.35 |
| Nitrogen (N), % | 0.15 to 0.4 | |
| 0 to 0.050 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |