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SAE-AISI M1 Steel vs. SAE-AISI T4 Steel

Both SAE-AISI M1 steel and SAE-AISI T4 steel are iron alloys. They have 78% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M1 steel and the bottom bar is SAE-AISI T4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 730 to 2140
800 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1560
1810
Melting Onset (Solidus), °C 1510
1750
Specific Heat Capacity, J/kg-K 450
410
Thermal Conductivity, W/m-K 29
21
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 18
55
Density, g/cm3 8.1
9.4
Embodied Carbon, kg CO2/kg material 7.0
8.5
Embodied Energy, MJ/kg 99
130
Embodied Water, L/kg 98
120

Common Calculations

PREN (Pitting Resistance) 35
37
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 25 to 73
24 to 64
Strength to Weight: Bending, points 22 to 45
20 to 39
Thermal Diffusivity, mm2/s 8.0
5.4
Thermal Shock Resistance, points 23 to 66
24 to 64

Alloy Composition

Carbon (C), % 0.78 to 0.88
0.7 to 0.8
Chromium (Cr), % 3.5 to 4.0
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 81 to 84.8
66.3 to 72.3
Manganese (Mn), % 0.15 to 0.4
0.1 to 0.4
Molybdenum (Mo), % 8.2 to 9.2
0.4 to 1.0
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 0.5
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
17.5 to 19
Vanadium (V), % 1.0 to 1.4
0.8 to 1.2

Comparable Variants