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SAE-AISI M42 Steel vs. SAE-AISI M34 Steel

Both SAE-AISI M42 steel and SAE-AISI M34 steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is SAE-AISI M34 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
800 to 2170

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1540
1540
Melting Onset (Solidus), °C 1490
1500
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 20
24
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 30
32
Density, g/cm3 8.2
8.2
Embodied Carbon, kg CO2/kg material 7.4
9.5
Embodied Energy, MJ/kg 100
140
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 38
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 79
27 to 74
Strength to Weight: Bending, points 24 to 48
23 to 46
Thermal Diffusivity, mm2/s 5.4
6.7
Thermal Shock Resistance, points 25 to 71
25 to 67

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.85 to 0.92
Chromium (Cr), % 3.5 to 4.3
3.5 to 4.0
Cobalt (Co), % 7.8 to 8.8
7.8 to 8.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.3 to 81
71.3 to 76.5
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 9.0 to 10
7.8 to 9.2
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.65
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.2 to 1.9
1.4 to 2.1
Vanadium (V), % 1.0 to 1.4
1.9 to 2.3

Comparable Variants