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ACI-ASTM CG8M Steel vs. S21900 Stainless Steel

Both ACI-ASTM CG8M steel and S21900 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CG8M steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
50
Fatigue Strength, MPa 280
380
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 550
710
Tensile Strength: Yield (Proof), MPa 300
390

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1020
980
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
14
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 20
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 4.1
3.0
Embodied Energy, MJ/kg 56
43
Embodied Water, L/kg 160
160

Common Calculations

PREN (Pitting Resistance) 31
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
300
Resilience: Unit (Modulus of Resilience), kJ/m3 220
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
26
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 4.3
3.8
Thermal Shock Resistance, points 12
15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 18 to 21
19 to 21.5
Iron (Fe), % 58.8 to 70
59.4 to 67.4
Manganese (Mn), % 0 to 1.5
8.0 to 10
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 9.0 to 13
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030