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SAE-AISI M34 Steel vs. S82121 Stainless Steel

Both SAE-AISI M34 steel and S82121 stainless steel are iron alloys. They have 77% 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 M34 steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
730

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1540
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
13

Otherwise Unclassified Properties

Base Metal Price, % relative 32
14
Density, g/cm3 8.2
7.7
Embodied Carbon, kg CO2/kg material 9.5
2.8
Embodied Energy, MJ/kg 140
40
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 35
28
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 23 to 46
23
Thermal Diffusivity, mm2/s 6.7
4.0
Thermal Shock Resistance, points 25 to 67
20

Alloy Composition

Carbon (C), % 0.85 to 0.92
0 to 0.035
Chromium (Cr), % 3.5 to 4.0
21 to 23
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0.2 to 1.2
Iron (Fe), % 71.3 to 76.5
66.7 to 75.4
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.5
Molybdenum (Mo), % 7.8 to 9.2
0.3 to 1.3
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
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), % 1.4 to 2.1
0
Vanadium (V), % 1.9 to 2.3
0