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ACI-ASTM CB30 Steel vs. S82121 Stainless Steel

Both ACI-ASTM CB30 steel and S82121 stainless steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 29 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 CB30 steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 500
730
Tensile Strength: Yield (Proof), MPa 230
510

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 940
1020
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1380
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.8
Embodied Energy, MJ/kg 33
40
Embodied Water, L/kg 130
150

Common Calculations

PREN (Pitting Resistance) 20
28
Resilience: Unit (Modulus of Resilience), kJ/m3 140
660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
26
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 5.6
4.0
Thermal Shock Resistance, points 17
20

Alloy Composition

Carbon (C), % 0 to 0.3
0 to 0.035
Chromium (Cr), % 18 to 21
21 to 23
Copper (Cu), % 0 to 1.2
0.2 to 1.2
Iron (Fe), % 72.9 to 82
66.7 to 75.4
Manganese (Mn), % 0 to 1.0
1.0 to 2.5
Molybdenum (Mo), % 0
0.3 to 1.3
Nickel (Ni), % 0 to 2.0
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.010