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S21904 Stainless Steel vs. ACI-ASTM CB7Cu-1 Steel

Both S21904 stainless steel and ACI-ASTM CB7Cu-1 steel are iron alloys. They have 85% of their average alloy composition in common. There are 30 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 S21904 stainless steel and the bottom bar is ACI-ASTM CB7Cu-1 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
76
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
1500
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
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.3

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
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
1500 to 3590
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
15.5 to 17.7
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 59.5 to 67.4
72.3 to 78.4
Manganese (Mn), % 8.0 to 10
0 to 0.7
Nickel (Ni), % 5.5 to 7.5
3.6 to 4.6
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