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SAE-AISI 8645 Steel vs. ASTM A372 Grade M Steel

Both SAE-AISI 8645 steel and ASTM A372 grade M steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is ASTM A372 grade M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 23
18 to 21
Fatigue Strength, MPa 280 to 350
450 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 380 to 400
510 to 570
Tensile Strength: Ultimate (UTS), MPa 600 to 670
810 to 910
Tensile Strength: Yield (Proof), MPa 390 to 560
660 to 770

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
450
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
2.0
Embodied Energy, MJ/kg 20
27
Embodied Water, L/kg 50
61

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
160
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
1140 to 1580
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 24
29 to 32
Strength to Weight: Bending, points 20 to 22
24 to 27
Thermal Diffusivity, mm2/s 10
12
Thermal Shock Resistance, points 18 to 20
24 to 27

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.23
Chromium (Cr), % 0.4 to 0.6
1.5 to 2.0
Iron (Fe), % 96.5 to 97.7
92.5 to 95.1
Manganese (Mn), % 0.75 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 0.15 to 0.25
0.4 to 0.6
Nickel (Ni), % 0.4 to 0.7
2.8 to 3.9
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.3
Sulfur (S), % 0 to 0.040
0 to 0.010
Vanadium (V), % 0
0 to 0.080

Comparable Variants