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

Both SAE-AISI H42 steel and SAE-AISI M7 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 H42 steel and the bottom bar is SAE-AISI M7 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 700 to 1980
760 to 2210

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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

Comparable Variants