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ACI-ASTM CB7Cu-2 Steel vs. S31254 Stainless Steel

Both ACI-ASTM CB7Cu-2 steel and S31254 stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 S31254 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300 to 420
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 5.7 to 11
40
Fatigue Strength, MPa 420 to 590
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
80
Tensile Strength: Ultimate (UTS), MPa 960 to 1350
720
Tensile Strength: Yield (Proof), MPa 760 to 1180
330

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 17
14
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 13
28
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.6
5.5
Embodied Energy, MJ/kg 38
74
Embodied Water, L/kg 130
190

Common Calculations

PREN (Pitting Resistance) 15
44
Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
240
Resilience: Unit (Modulus of Resilience), kJ/m3 1510 to 3600
270
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 34 to 48
25
Strength to Weight: Bending, points 28 to 35
22
Thermal Diffusivity, mm2/s 4.6
3.8
Thermal Shock Resistance, points 32 to 45
15

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.020
Chromium (Cr), % 14 to 15.5
19.5 to 20.5
Copper (Cu), % 2.5 to 3.2
0.5 to 1.0
Iron (Fe), % 73.6 to 79
51.4 to 56.3
Manganese (Mn), % 0 to 0.7
0 to 1.0
Molybdenum (Mo), % 0
6.0 to 6.5
Nickel (Ni), % 4.5 to 5.5
17.5 to 18.5
Niobium (Nb), % 0 to 0.35
0
Nitrogen (N), % 0 to 0.050
0.18 to 0.22
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.010