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ACI-ASTM CG8M Steel vs. ASTM A387 Grade 91 Class 2

Both ACI-ASTM CG8M steel and ASTM A387 grade 91 class 2 are iron alloys. They have 75% of their average alloy composition in common. There are 31 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 ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
20
Fatigue Strength, MPa 280
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
75
Tensile Strength: Ultimate (UTS), MPa 550
670
Tensile Strength: Yield (Proof), MPa 300
470

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1020
600
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
10

Otherwise Unclassified Properties

Base Metal Price, % relative 20
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.1
2.6
Embodied Energy, MJ/kg 56
37
Embodied Water, L/kg 160
88

Common Calculations

PREN (Pitting Resistance) 31
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
120
Resilience: Unit (Modulus of Resilience), kJ/m3 220
580
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 Diffusivity, mm2/s 4.3
6.9
Thermal Shock Resistance, points 12
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.080
0.080 to 0.12
Chromium (Cr), % 18 to 21
8.0 to 9.5
Iron (Fe), % 58.8 to 70
87.3 to 90.3
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 3.0 to 4.0
0.85 to 1.1
Nickel (Ni), % 9.0 to 13
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.5
0.2 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010