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ACI-ASTM CG8M Steel vs. AISI 304 Stainless Steel

Both ACI-ASTM CG8M steel and AISI 304 stainless steel are iron alloys. They have a moderately high 94% 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 AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
8.0 to 43
Fatigue Strength, MPa 280
210 to 440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
77
Tensile Strength: Ultimate (UTS), MPa 550
580 to 1180
Tensile Strength: Yield (Proof), MPa 300
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1020
710
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 20
15
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.1
3.0
Embodied Energy, MJ/kg 56
43
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 31
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 220
140 to 1870
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
21 to 42
Strength to Weight: Bending, points 19
20 to 32
Thermal Diffusivity, mm2/s 4.3
4.2
Thermal Shock Resistance, points 12
12 to 25

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 18 to 21
18 to 20
Iron (Fe), % 58.8 to 70
66.5 to 74
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 9.0 to 13
8.0 to 10.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030