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SAE-AISI M4 Steel vs. S31730 Stainless Steel

Both SAE-AISI M4 steel and S31730 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is S31730 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 76
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
540

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1610
1430
Melting Onset (Solidus), °C 1560
1390
Specific Heat Capacity, J/kg-K 440
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 25
24
Density, g/cm3 8.3
8.0
Embodied Carbon, kg CO2/kg material 14
4.6
Embodied Energy, MJ/kg 210
63
Embodied Water, L/kg 110
180

Common Calculations

PREN (Pitting Resistance) 30
30
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
19
Strength to Weight: Bending, points 23 to 45
18
Thermal Shock Resistance, points 24 to 68
12

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.030
Chromium (Cr), % 3.8 to 4.8
17 to 19
Copper (Cu), % 0 to 0.25
4.0 to 5.0
Iron (Fe), % 75.9 to 81.4
52.4 to 61
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 4.3 to 5.5
3.0 to 4.0
Nickel (Ni), % 0 to 0.3
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0