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AISI 309 Stainless Steel vs. SAE-AISI M42 Steel

Both AISI 309 stainless steel and SAE-AISI M42 steel are iron alloys. They have 67% 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 AISI 309 stainless steel and the bottom bar is SAE-AISI M42 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 600 to 710
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1450
1540
Melting Onset (Solidus), °C 1400
1490
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
20
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Base Metal Price, % relative 19
30
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 3.6
7.4
Embodied Energy, MJ/kg 51
100
Embodied Water, L/kg 170
140

Common Calculations

PREN (Pitting Resistance) 23
38
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 25
28 to 79
Strength to Weight: Bending, points 20 to 23
24 to 48
Thermal Diffusivity, mm2/s 4.3
5.4
Thermal Shock Resistance, points 14 to 16
25 to 71

Alloy Composition

Carbon (C), % 0 to 0.2
1.1 to 1.2
Chromium (Cr), % 22 to 24
3.5 to 4.3
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 58 to 66
76.3 to 81
Manganese (Mn), % 0 to 2.0
0.15 to 0.4
Molybdenum (Mo), % 0
9.0 to 10
Nickel (Ni), % 12 to 15
0 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
0.15 to 0.65
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.2 to 1.9
Vanadium (V), % 0
1.0 to 1.4