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SAE-AISI M7 Steel vs. SAE-AISI H23 Steel

Both SAE-AISI M7 steel and SAE-AISI H23 steel are iron alloys. They have 82% 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 H23 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
760 to 1550

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1560
1680
Melting Onset (Solidus), °C 1510
1630
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 28
20
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 18
34
Density, g/cm3 8.1
8.7
Embodied Carbon, kg CO2/kg material 8.9
6.9
Embodied Energy, MJ/kg 130
110
Embodied Water, L/kg 100
120

Common Calculations

PREN (Pitting Resistance) 35
32
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 26 to 76
24 to 49
Strength to Weight: Bending, points 23 to 47
21 to 34
Thermal Diffusivity, mm2/s 7.8
5.2
Thermal Shock Resistance, points 24 to 69
23 to 47

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.25 to 0.35
Chromium (Cr), % 3.5 to 4.0
11 to 12.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 79.8 to 83.8
71.3 to 76.7
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 8.2 to 9.2
0
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
0.15 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
11 to 12.8
Vanadium (V), % 1.8 to 2.3
0.75 to 1.3

Comparable Variants