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SAE-AISI T6 Steel vs. SAE-AISI M4 Steel

Both SAE-AISI T6 steel and SAE-AISI M4 steel are iron alloys. They have 74% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI T6 steel and the bottom bar is SAE-AISI M4 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 81
76
Tensile Strength: Ultimate (UTS), MPa 880 to 2150
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1830
1610
Melting Onset (Solidus), °C 1770
1560
Specific Heat Capacity, J/kg-K 400
440
Thermal Conductivity, W/m-K 18
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 70
25
Density, g/cm3 9.5
8.3
Embodied Carbon, kg CO2/kg material 11
14
Embodied Energy, MJ/kg 170
210
Embodied Water, L/kg 160
110

Common Calculations

PREN (Pitting Resistance) 39
30
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 26 to 63
26 to 72
Strength to Weight: Bending, points 21 to 39
23 to 45
Thermal Diffusivity, mm2/s 4.7
6.9
Thermal Shock Resistance, points 26 to 64
24 to 68

Alloy Composition

Carbon (C), % 0.75 to 0.85
1.3 to 1.4
Chromium (Cr), % 4.0 to 4.8
3.8 to 4.8
Cobalt (Co), % 11 to 13
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 55.9 to 63.5
75.9 to 81.4
Manganese (Mn), % 0.2 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
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 0.4
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 18.5 to 21
5.3 to 6.5
Vanadium (V), % 1.5 to 2.1
3.8 to 4.5

Comparable Variants