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SAE-AISI M7 Steel vs. EN 1.4581 Stainless Steel

Both SAE-AISI M7 steel and EN 1.4581 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is EN 1.4581 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
78
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
510

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1560
1440
Melting Onset (Solidus), °C 1510
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 28
15
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 18
21
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
4.2
Embodied Energy, MJ/kg 130
59
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 35
26
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
18
Strength to Weight: Bending, points 23 to 47
18
Thermal Diffusivity, mm2/s 7.8
3.9
Thermal Shock Resistance, points 24 to 69
12

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.070
Chromium (Cr), % 3.5 to 4.0
18 to 20
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
61.4 to 71
Manganese (Mn), % 0.15 to 0.4
0 to 1.5
Molybdenum (Mo), % 8.2 to 9.2
2.0 to 2.5
Nickel (Ni), % 0 to 0.3
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.55
0 to 1.5
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