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SAE-AISI M30 Steel vs. S31655 Stainless Steel

Both SAE-AISI M30 steel and S31655 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 (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M30 steel and the bottom bar is S31655 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 78
78
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
710

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1550
1430
Melting Onset (Solidus), °C 1500
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 24
15
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 26
17
Density, g/cm3 8.2
7.8
Embodied Carbon, kg CO2/kg material 7.2
3.3
Embodied Energy, MJ/kg 100
46
Embodied Water, L/kg 120
160

Common Calculations

PREN (Pitting Resistance) 35
27
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 74
25
Strength to Weight: Bending, points 24 to 46
23
Thermal Diffusivity, mm2/s 6.6
4.0
Thermal Shock Resistance, points 25 to 67
16

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.030
Chromium (Cr), % 3.5 to 4.3
19.5 to 21.5
Cobalt (Co), % 4.5 to 5.5
0
Copper (Cu), % 0 to 0.25
0 to 1.0
Iron (Fe), % 75.2 to 80.9
63.2 to 71.9
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 7.8 to 9.0
0.5 to 1.5
Nickel (Ni), % 0 to 0.3
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 1.3 to 2.3
0
Vanadium (V), % 1.0 to 1.4
0