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SAE-AISI M7 Steel vs. S45000 Stainless Steel

Both SAE-AISI M7 steel and S45000 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is S45000 stainless 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
76
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
980 to 1410

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1560
1440
Melting Onset (Solidus), °C 1510
1390
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 28
17
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 18
13
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
2.8
Embodied Energy, MJ/kg 130
39
Embodied Water, L/kg 100
130

Common Calculations

PREN (Pitting Resistance) 35
17
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
35 to 50
Strength to Weight: Bending, points 23 to 47
28 to 36
Thermal Diffusivity, mm2/s 7.8
4.5
Thermal Shock Resistance, points 24 to 69
33 to 47

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.050
Chromium (Cr), % 3.5 to 4.0
14 to 16
Copper (Cu), % 0 to 0.25
1.3 to 1.8
Iron (Fe), % 79.8 to 83.8
72.1 to 79.3
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 8.2 to 9.2
0.5 to 1.0
Nickel (Ni), % 0 to 0.3
5.0 to 7.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.55
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0

Comparable Variants