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SAE-AISI M2 Steel vs. AISI 321H Stainless Steel

Both SAE-AISI M2 steel and AISI 321H stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 22 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 M2 steel and the bottom bar is AISI 321H 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 760 to 2150
580

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1610
1430
Melting Onset (Solidus), °C 1570
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 22
15
Thermal Expansion, µm/m-K 10
17

Otherwise Unclassified Properties

Base Metal Price, % relative 24
16
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
3.2
Embodied Energy, MJ/kg 130
46
Embodied Water, L/kg 98
140

Common Calculations

PREN (Pitting Resistance) 31
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
21
Strength to Weight: Bending, points 22 to 44
20
Thermal Diffusivity, mm2/s 5.9
4.0
Thermal Shock Resistance, points 27 to 76
12

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.040 to 0.1
Chromium (Cr), % 3.8 to 4.5
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
65.4 to 74
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 0 to 0.3
9.0 to 12
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), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0