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S82121 Stainless Steel vs. ACI-ASTM CB7Cu-1 Steel

Both S82121 stainless steel and ACI-ASTM CB7Cu-1 steel are iron alloys. They have a moderately high 92% 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 S82121 stainless steel and the bottom bar is ACI-ASTM CB7Cu-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
300 to 420
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 28
5.7 to 11
Fatigue Strength, MPa 370
420 to 590
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 730
960 to 1350
Tensile Strength: Yield (Proof), MPa 510
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1380
1500
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 14
13
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.8
2.6
Embodied Energy, MJ/kg 40
38
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 28
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 660
1500 to 3590
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
34 to 48
Strength to Weight: Bending, points 23
28 to 35
Thermal Diffusivity, mm2/s 4.0
4.6
Thermal Shock Resistance, points 20
32 to 45

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.070
Chromium (Cr), % 21 to 23
15.5 to 17.7
Copper (Cu), % 0.2 to 1.2
2.5 to 3.2
Iron (Fe), % 66.7 to 75.4
72.3 to 78.4
Manganese (Mn), % 1.0 to 2.5
0 to 0.7
Molybdenum (Mo), % 0.3 to 1.3
0
Nickel (Ni), % 2.0 to 4.0
3.6 to 4.6
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0.15 to 0.25
0 to 0.050
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030