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SAE-AISI T4 Steel vs. SAE-AISI M3 Class 2 Steel

Both SAE-AISI T4 steel and SAE-AISI M3 class 2 steel are iron alloys. They have 83% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI T4 steel and the bottom bar is SAE-AISI M3 class 2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
77
Tensile Strength: Ultimate (UTS), MPa 800 to 2140
770 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1810
1620
Melting Onset (Solidus), °C 1750
1570
Specific Heat Capacity, J/kg-K 410
440
Thermal Conductivity, W/m-K 21
26
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 55
25
Density, g/cm3 9.4
8.3
Embodied Carbon, kg CO2/kg material 8.5
12
Embodied Energy, MJ/kg 130
180
Embodied Water, L/kg 120
110

Common Calculations

PREN (Pitting Resistance) 37
33
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 24 to 64
26 to 74
Strength to Weight: Bending, points 20 to 39
22 to 45
Thermal Diffusivity, mm2/s 5.4
7.2
Thermal Shock Resistance, points 24 to 64
24 to 69

Alloy Composition

Carbon (C), % 0.7 to 0.8
1.2 to 1.3
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.5
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 66.3 to 72.3
75.8 to 82.3
Manganese (Mn), % 0.1 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
4.8 to 6.5
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 0.4
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 17.5 to 19
5.0 to 6.8
Vanadium (V), % 0.8 to 1.2
2.8 to 3.8

Comparable Variants