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SAE-AISI M3 Class 1 Steel vs. SAE-AISI M4 Steel

Both SAE-AISI M3 class 1 steel and SAE-AISI M4 steel are iron alloys. They have a very high 98% 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 M4 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
76
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1610
1610
Melting Onset (Solidus), °C 1570
1560
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 26
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
25
Density, g/cm3 8.3
8.3
Embodied Carbon, kg CO2/kg material 10
14
Embodied Energy, MJ/kg 150
210
Embodied Water, L/kg 100
110

Common Calculations

PREN (Pitting Resistance) 33
30
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26 to 72
26 to 72
Strength to Weight: Bending, points 22 to 44
23 to 45
Thermal Diffusivity, mm2/s 7.2
6.9
Thermal Shock Resistance, points 24 to 67
24 to 68

Alloy Composition

Carbon (C), % 1.0 to 1.1
1.3 to 1.4
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.9 to 82.9
75.9 to 81.4
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 4.8 to 6.5
4.3 to 5.5
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
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 6.8
5.3 to 6.5
Vanadium (V), % 2.3 to 2.8
3.8 to 4.5

Comparable Variants