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SAE-AISI M7 Steel vs. SAE-AISI H42 Steel

Both SAE-AISI M7 steel and SAE-AISI H42 steel are iron alloys. They have a very high 95% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is SAE-AISI H42 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
700 to 1980

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1560
1620
Melting Onset (Solidus), °C 1510
1570
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 28
24
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 18
24
Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 8.9
8.8
Embodied Energy, MJ/kg 130
130
Embodied Water, L/kg 100
98

Common Calculations

PREN (Pitting Resistance) 35
31
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 26 to 76
23 to 65
Strength to Weight: Bending, points 23 to 47
21 to 42
Thermal Diffusivity, mm2/s 7.8
6.5
Thermal Shock Resistance, points 24 to 69
20 to 57

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.55 to 0.7
Chromium (Cr), % 3.5 to 4.0
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 79.8 to 83.8
79.3 to 83.8
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 8.2 to 9.2
4.5 to 5.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.55
0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
5.5 to 6.8
Vanadium (V), % 1.8 to 2.3
1.8 to 2.2

Comparable Variants