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ACI-ASTM CG8M Steel vs. AISI 440A Stainless Steel

Both ACI-ASTM CG8M steel and AISI 440A stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CG8M steel and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
5.0 to 20
Fatigue Strength, MPa 280
270 to 790
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
77
Tensile Strength: Ultimate (UTS), MPa 550
730 to 1790
Tensile Strength: Yield (Proof), MPa 300
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 420
400
Maximum Temperature: Mechanical, °C 1020
760
Melting Completion (Liquidus), °C 1450
1480
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
23
Thermal Expansion, µm/m-K 16
10

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
9.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 4.1
2.2
Embodied Energy, MJ/kg 56
31
Embodied Water, L/kg 160
120

Common Calculations

PREN (Pitting Resistance) 31
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
87 to 120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
26 to 65
Strength to Weight: Bending, points 19
23 to 43
Thermal Diffusivity, mm2/s 4.3
6.2
Thermal Shock Resistance, points 12
26 to 65

Alloy Composition

Carbon (C), % 0 to 0.080
0.6 to 0.75
Chromium (Cr), % 18 to 21
16 to 18
Iron (Fe), % 58.8 to 70
78.4 to 83.4
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 3.0 to 4.0
0 to 0.75
Nickel (Ni), % 9.0 to 13
0
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 0.015