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SAE-AISI M43 Steel vs. S21800 Stainless Steel

Both SAE-AISI M43 steel and S21800 stainless 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 SAE-AISI M43 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 810 to 2290
740

Thermal Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 33
15
Density, g/cm3 8.2
7.5
Embodied Carbon, kg CO2/kg material 8.5
3.1
Embodied Energy, MJ/kg 120
45
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 35
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 27 to 77
27
Strength to Weight: Bending, points 24 to 47
24
Thermal Shock Resistance, points 25 to 71
17

Alloy Composition

Carbon (C), % 1.2 to 1.3
0 to 0.1
Chromium (Cr), % 3.5 to 4.3
16 to 18
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 70.8 to 76
59.1 to 65.4
Manganese (Mn), % 0.2 to 0.4
7.0 to 9.0
Molybdenum (Mo), % 7.5 to 8.5
0
Nickel (Ni), % 0 to 0.3
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0.15 to 0.65
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.3 to 3.0
0
Vanadium (V), % 1.5 to 1.8
0