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SAE-AISI M6 Steel vs. AISI 321 Stainless Steel

Both SAE-AISI M6 steel and AISI 321 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M6 steel and the bottom bar is AISI 321 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 77
77
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
590 to 690

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1560
1430
Melting Onset (Solidus), °C 1510
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 17
16
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 39
16
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
3.2
Embodied Energy, MJ/kg 120
45
Embodied Water, L/kg 160
140

Common Calculations

PREN (Pitting Resistance) 28
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28 to 73
21 to 25
Strength to Weight: Bending, points 24 to 45
20 to 22
Thermal Diffusivity, mm2/s 4.7
4.1
Thermal Shock Resistance, points 26 to 68
13 to 15

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.080
Chromium (Cr), % 3.8 to 4.5
17 to 19
Cobalt (Co), % 11 to 13
0
Iron (Fe), % 68.8 to 74.6
65.3 to 74
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 0
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.45
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0