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S21800 Stainless Steel vs. SAE-AISI M30 Steel

Both S21800 stainless steel and SAE-AISI M30 steel are iron alloys. They have 67% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is SAE-AISI M30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
78
Tensile Strength: Ultimate (UTS), MPa 740
800 to 2170

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Melting Completion (Liquidus), °C 1360
1550
Melting Onset (Solidus), °C 1310
1500
Specific Heat Capacity, J/kg-K 500
450
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 15
26
Density, g/cm3 7.5
8.2
Embodied Carbon, kg CO2/kg material 3.1
7.2
Embodied Energy, MJ/kg 45
100
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 19
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
27 to 74
Strength to Weight: Bending, points 24
24 to 46
Thermal Shock Resistance, points 17
25 to 67

Alloy Composition

Carbon (C), % 0 to 0.1
0.75 to 0.85
Chromium (Cr), % 16 to 18
3.5 to 4.3
Cobalt (Co), % 0
4.5 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 59.1 to 65.4
75.2 to 80.9
Manganese (Mn), % 7.0 to 9.0
0.15 to 0.4
Molybdenum (Mo), % 0
7.8 to 9.0
Nickel (Ni), % 8.0 to 9.0
0 to 0.3
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.030
Silicon (Si), % 3.5 to 4.5
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.3 to 2.3
Vanadium (V), % 0
1.0 to 1.4