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SAE-AISI M3 Class 1 Steel vs. SAE-AISI M43 Steel

Both SAE-AISI M3 class 1 steel and SAE-AISI M43 steel are iron alloys. They have 89% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M3 class 1 steel and the bottom bar is SAE-AISI M43 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 77
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
810 to 2290

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1550
Melting Onset (Solidus), °C 1570
1500
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 26
19
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
33
Density, g/cm3 8.3
8.2
Embodied Carbon, kg CO2/kg material 10
8.5
Embodied Energy, MJ/kg 150
120
Embodied Water, L/kg 100
140

Common Calculations

PREN (Pitting Resistance) 33
35
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
27 to 77
Strength to Weight: Bending, points 22 to 44
24 to 47
Thermal Diffusivity, mm2/s 7.2
5.3
Thermal Shock Resistance, points 24 to 67
25 to 71

Alloy Composition

Carbon (C), % 1.0 to 1.1
1.2 to 1.3
Chromium (Cr), % 3.8 to 4.5
3.5 to 4.3
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.9 to 82.9
70.8 to 76
Manganese (Mn), % 0.15 to 0.4
0.2 to 0.4
Molybdenum (Mo), % 4.8 to 6.5
7.5 to 8.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.15 to 0.65
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 6.8
2.3 to 3.0
Vanadium (V), % 2.3 to 2.8
1.5 to 1.8

Comparable Variants