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S31727 Stainless Steel vs. ACI-ASTM CB7Cu-2 Steel

Both S31727 stainless steel and ACI-ASTM CB7Cu-2 steel are iron alloys. They have 81% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is ACI-ASTM CB7Cu-2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
300 to 420
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
5.7 to 11
Fatigue Strength, MPa 240
420 to 590
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
75
Tensile Strength: Ultimate (UTS), MPa 630
960 to 1350
Tensile Strength: Yield (Proof), MPa 270
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 24
13
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 4.7
2.6
Embodied Energy, MJ/kg 64
38
Embodied Water, L/kg 180
130

Common Calculations

PREN (Pitting Resistance) 35
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 190
1510 to 3600
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
34 to 48
Strength to Weight: Bending, points 20
28 to 35
Thermal Shock Resistance, points 14
32 to 45

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.070
Chromium (Cr), % 17.5 to 19
14 to 15.5
Copper (Cu), % 2.8 to 4.0
2.5 to 3.2
Iron (Fe), % 53.7 to 61.3
73.6 to 79
Manganese (Mn), % 0 to 1.0
0 to 0.7
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
4.5 to 5.5
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0.15 to 0.21
0 to 0.050
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030