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SAE-AISI M30 Steel vs. S21900 Stainless Steel

Both SAE-AISI M30 steel and S21900 stainless steel are iron alloys. They have 68% 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 S21900 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
1400
Melting Onset (Solidus), °C 1500
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 24
14
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 26
15
Density, g/cm3 8.2
7.7
Embodied Carbon, kg CO2/kg material 7.2
3.0
Embodied Energy, MJ/kg 100
43
Embodied Water, L/kg 120
160

Common Calculations

PREN (Pitting Resistance) 35
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 74
26
Strength to Weight: Bending, points 24 to 46
23
Thermal Diffusivity, mm2/s 6.6
3.8
Thermal Shock Resistance, points 25 to 67
15

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.080
Chromium (Cr), % 3.5 to 4.3
19 to 21.5
Cobalt (Co), % 4.5 to 5.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.2 to 80.9
59.4 to 67.4
Manganese (Mn), % 0.15 to 0.4
8.0 to 10
Molybdenum (Mo), % 7.8 to 9.0
0
Nickel (Ni), % 0 to 0.3
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
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 0.030
Tungsten (W), % 1.3 to 2.3
0
Vanadium (V), % 1.0 to 1.4
0