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ACI-ASTM CG8M Steel vs. S21800 Stainless Steel

Both ACI-ASTM CG8M steel and S21800 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CG8M steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
40
Fatigue Strength, MPa 280
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
75
Tensile Strength: Ultimate (UTS), MPa 550
740
Tensile Strength: Yield (Proof), MPa 300
390

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 1020
900
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1400
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 20
15
Density, g/cm3 7.9
7.5
Embodied Carbon, kg CO2/kg material 4.1
3.1
Embodied Energy, MJ/kg 56
45
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 31
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
250
Resilience: Unit (Modulus of Resilience), kJ/m3 220
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 19
27
Strength to Weight: Bending, points 19
24
Thermal Shock Resistance, points 12
17

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.1
Chromium (Cr), % 18 to 21
16 to 18
Iron (Fe), % 58.8 to 70
59.1 to 65.4
Manganese (Mn), % 0 to 1.5
7.0 to 9.0
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 9.0 to 13
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 1.5
3.5 to 4.5
Sulfur (S), % 0 to 0.040
0 to 0.030