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SAE-AISI M2 Steel vs. SAE-AISI M47 Steel

Both SAE-AISI M2 steel and SAE-AISI M47 steel are iron alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M2 steel and the bottom bar is SAE-AISI M47 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 77
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1540
Melting Onset (Solidus), °C 1570
1500
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 22
23
Thermal Expansion, µm/m-K 10
11

Otherwise Unclassified Properties

Base Metal Price, % relative 24
26
Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.8
7.4
Embodied Energy, MJ/kg 130
100
Embodied Water, L/kg 98
120

Common Calculations

PREN (Pitting Resistance) 31
38
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 25 to 71
28 to 79
Strength to Weight: Bending, points 22 to 44
24 to 48
Thermal Diffusivity, mm2/s 5.9
6.3
Thermal Shock Resistance, points 27 to 76
27 to 77

Alloy Composition

Carbon (C), % 0.78 to 1.1
1.1 to 1.2
Chromium (Cr), % 3.8 to 4.5
3.5 to 4.0
Cobalt (Co), % 0
4.8 to 5.3
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78.5 to 83.4
78.7 to 85
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 4.5 to 5.5
9.3 to 10
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 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
1.3 to 1.8
Vanadium (V), % 1.8 to 2.2
1.2 to 1.4

Comparable Variants