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SAE-AISI M7 Steel vs. EN 1.4971 Stainless Steel

Both SAE-AISI M7 steel and EN 1.4971 stainless steel are iron alloys. They have 40% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (9, 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 1.4971 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
800

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1560
1460
Melting Onset (Solidus), °C 1510
1410
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 28
13
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Base Metal Price, % relative 18
70
Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 8.9
7.6
Embodied Energy, MJ/kg 130
110
Embodied Water, L/kg 100
300

Common Calculations

PREN (Pitting Resistance) 35
38
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 76
26
Strength to Weight: Bending, points 23 to 47
23
Thermal Diffusivity, mm2/s 7.8
3.4
Thermal Shock Resistance, points 24 to 69
19

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.080 to 0.16
Chromium (Cr), % 3.5 to 4.0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
24.3 to 37.1
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 8.2 to 9.2
2.5 to 3.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.55
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 1.4 to 2.1
2.0 to 3.0
Vanadium (V), % 1.8 to 2.3
0