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SAE-AISI M6 Steel vs. S44725 Stainless Steel

Both SAE-AISI M6 steel and S44725 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M6 steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
500

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1560
1450
Melting Onset (Solidus), °C 1510
1410
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 17
17
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 39
15
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.1
Embodied Energy, MJ/kg 120
44
Embodied Water, L/kg 160
170

Common Calculations

PREN (Pitting Resistance) 28
33
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28 to 73
18
Strength to Weight: Bending, points 24 to 45
18
Thermal Diffusivity, mm2/s 4.7
4.6
Thermal Shock Resistance, points 26 to 68
16

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.015
Chromium (Cr), % 3.8 to 4.5
25 to 28.5
Cobalt (Co), % 11 to 13
0
Iron (Fe), % 68.8 to 74.6
67.6 to 73.5
Manganese (Mn), % 0.15 to 0.4
0 to 0.4
Molybdenum (Mo), % 4.5 to 5.5
1.5 to 2.5
Nickel (Ni), % 0
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 0.040
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.26
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0