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SAE-AISI M7 Steel vs. EN 1.4378 Stainless Steel

Both SAE-AISI M7 steel and EN 1.4378 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 20 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 1.4378 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
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
760 to 1130

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1560
1390
Melting Onset (Solidus), °C 1510
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 18
12
Density, g/cm3 8.1
7.6
Embodied Carbon, kg CO2/kg material 8.9
2.7
Embodied Energy, MJ/kg 130
39
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 35
23
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
28 to 41
Strength to Weight: Bending, points 23 to 47
24 to 31
Thermal Shock Resistance, points 24 to 69
16 to 23

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.080
Chromium (Cr), % 3.5 to 4.0
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
61.2 to 69
Manganese (Mn), % 0.15 to 0.4
11.5 to 14.5
Molybdenum (Mo), % 8.2 to 9.2
0
Nickel (Ni), % 0 to 0.3
2.3 to 3.7
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.060
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