MakeItFrom.com
Menu (ESC)

SAE-AISI T8 Steel vs. SAE-AISI M4 Steel

Both SAE-AISI T8 steel and SAE-AISI M4 steel are iron alloys. They have 87% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI T8 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 78
76
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1730
1610
Melting Onset (Solidus), °C 1670
1560
Specific Heat Capacity, J/kg-K 420
440
Thermal Conductivity, W/m-K 18
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 45
25
Density, g/cm3 9.0
8.3
Embodied Carbon, kg CO2/kg material 10
14
Embodied Energy, MJ/kg 160
210
Embodied Water, L/kg 120
110

Common Calculations

PREN (Pitting Resistance) 30
30
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 24 to 66
26 to 72
Strength to Weight: Bending, points 21 to 41
23 to 45
Thermal Diffusivity, mm2/s 4.8
6.9
Thermal Shock Resistance, points 24 to 66
24 to 68

Alloy Composition

Carbon (C), % 0.75 to 0.85
1.3 to 1.4
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.8
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 69.3 to 75.4
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), % 13.3 to 14.8
5.3 to 6.5
Vanadium (V), % 1.8 to 2.4
3.8 to 4.5

Comparable Variants