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ASTM A372 Grade M Class 100 vs. ASTM A372 Grade M Class 85

Both ASTM A372 grade M class 100 and ASTM A372 grade M class 85 are variants of the same material. They share alloy composition and many physical properties, but develop different mechanical properties as a result of different processing.

For each property being compared, the top bar is ASTM A372 grade M class 100 and the bottom bar is ASTM A372 grade M class 85.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18
21
Fatigue Strength, MPa 520
450
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 570
510
Tensile Strength: Ultimate (UTS), MPa 910
810
Tensile Strength: Yield (Proof), MPa 770
660

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 450
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 46
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 3.4
3.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
160
Resilience: Unit (Modulus of Resilience), kJ/m3 1580
1140
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
29
Strength to Weight: Bending, points 27
24
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 27
24

Alloy Composition

Carbon (C), % 0 to 0.23
0 to 0.23
Chromium (Cr), % 1.5 to 2.0
1.5 to 2.0
Iron (Fe), % 92.5 to 95.1
92.5 to 95.1
Manganese (Mn), % 0.2 to 0.4
0.2 to 0.4
Molybdenum (Mo), % 0.4 to 0.6
0.4 to 0.6
Nickel (Ni), % 2.8 to 3.9
2.8 to 3.9
Phosphorus (P), % 0 to 0.015
0 to 0.015
Silicon (Si), % 0 to 0.3
0 to 0.3
Sulfur (S), % 0 to 0.010
0 to 0.010
Vanadium (V), % 0 to 0.080
0 to 0.080