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Annealed SAE-AISI M2 vs. Annealed SAE-AISI T2

Both annealed SAE-AISI M2 and annealed SAE-AISI T2 are iron alloys. Both are furnished in the annealed condition. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is annealed SAE-AISI M2 and the bottom bar is annealed SAE-AISI T2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Rockwell B Hardness 99
100
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 760
780

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1610
1820
Melting Onset (Solidus), °C 1570
1760
Specific Heat Capacity, J/kg-K 440
410
Thermal Conductivity, W/m-K 22
19
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
46
Density, g/cm3 8.4
9.3
Embodied Carbon, kg CO2/kg material 8.8
11
Embodied Energy, MJ/kg 130
170
Embodied Water, L/kg 98
98

Common Calculations

PREN (Pitting Resistance) 31
36
Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 25
23
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 5.9
4.9
Thermal Shock Resistance, points 27
23

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.8 to 0.9
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78.5 to 83.4
70.8 to 75.8
Manganese (Mn), % 0.15 to 0.4
0.2 to 0.4
Molybdenum (Mo), % 4.5 to 5.5
0 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 0.45
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
17.5 to 19
Vanadium (V), % 1.8 to 2.2
1.8 to 2.4