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

Both ASTM A387 grade 91 class 2 and ACI-ASTM CG8M steel 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 ASTM A387 grade 91 class 2 and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 13
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
210
Resilience: Unit (Modulus of Resilience), kJ/m3 580
220
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
19
Strength to Weight: Bending, points 22
19
Thermal Diffusivity, mm2/s 6.9
4.3
Thermal Shock Resistance, points 19
12

Alloy Composition

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