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ACI-ASTM CB7Cu-2 Steel vs. S31730 Stainless Steel

Both ACI-ASTM CB7Cu-2 steel and S31730 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CB7Cu-2 steel and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300 to 420
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 5.7 to 11
40
Fatigue Strength, MPa 420 to 590
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 960 to 1350
540
Tensile Strength: Yield (Proof), MPa 760 to 1180
200

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1380
1390
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 13
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.6
4.6
Embodied Energy, MJ/kg 38
63
Embodied Water, L/kg 130
180

Common Calculations

PREN (Pitting Resistance) 15
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
170
Resilience: Unit (Modulus of Resilience), kJ/m3 1510 to 3600
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 34 to 48
19
Strength to Weight: Bending, points 28 to 35
18
Thermal Shock Resistance, points 32 to 45
12

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 14 to 15.5
17 to 19
Copper (Cu), % 2.5 to 3.2
4.0 to 5.0
Iron (Fe), % 73.6 to 79
52.4 to 61
Manganese (Mn), % 0 to 0.7
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 4.5 to 5.5
15 to 16.5
Niobium (Nb), % 0 to 0.35
0
Nitrogen (N), % 0 to 0.050
0 to 0.045
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010