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SAE-AISI M42 Steel vs. AISI 440A Stainless Steel

Both SAE-AISI M42 steel and AISI 440A stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is AISI 440A 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 78
77
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
730 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1540
1480
Melting Onset (Solidus), °C 1490
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 20
23
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 30
9.0
Density, g/cm3 8.2
7.7
Embodied Carbon, kg CO2/kg material 7.4
2.2
Embodied Energy, MJ/kg 100
31
Embodied Water, L/kg 140
120

Common Calculations

PREN (Pitting Resistance) 38
18
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 28 to 79
26 to 65
Strength to Weight: Bending, points 24 to 48
23 to 43
Thermal Diffusivity, mm2/s 5.4
6.2
Thermal Shock Resistance, points 25 to 71
26 to 65

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.6 to 0.75
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), % 76.3 to 81
78.4 to 83.4
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 9.0 to 10
0 to 0.75
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 0.65
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0

Comparable Variants