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ACI-ASTM CG8M Steel vs. ACI-ASTM CG6MMN Steel

Both ACI-ASTM CG8M steel and ACI-ASTM CG6MMN steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a moderately high 91% of their average alloy composition in common. There are 28 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 CG8M steel and the bottom bar is ACI-ASTM CG6MMN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
34
Fatigue Strength, MPa 280
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
79
Tensile Strength: Ultimate (UTS), MPa 550
670
Tensile Strength: Yield (Proof), MPa 300
320

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
460
Maximum Temperature: Mechanical, °C 1020
1080
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 20
22
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.1
4.8
Embodied Energy, MJ/kg 56
68
Embodied Water, L/kg 160
180

Common Calculations

PREN (Pitting Resistance) 31
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
190
Resilience: Unit (Modulus of Resilience), kJ/m3 220
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
22
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.060
Chromium (Cr), % 18 to 21
20.5 to 23.5
Iron (Fe), % 58.8 to 70
51.9 to 62.1
Manganese (Mn), % 0 to 1.5
4.0 to 6.0
Molybdenum (Mo), % 3.0 to 4.0
1.5 to 3.0
Nickel (Ni), % 9.0 to 13
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
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 0.030
Vanadium (V), % 0
0.1 to 0.3