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SAE-AISI M43 Steel vs. S44725 Stainless Steel

Both SAE-AISI M43 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 M43 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 810 to 2290
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1550
1450
Melting Onset (Solidus), °C 1500
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 19
17
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 33
15
Density, g/cm3 8.2
7.7
Embodied Carbon, kg CO2/kg material 8.5
3.1
Embodied Energy, MJ/kg 120
44
Embodied Water, L/kg 140
170

Common Calculations

PREN (Pitting Resistance) 35
33
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 77
18
Strength to Weight: Bending, points 24 to 47
18
Thermal Diffusivity, mm2/s 5.3
4.6
Thermal Shock Resistance, points 25 to 71
16

Alloy Composition

Carbon (C), % 1.2 to 1.3
0 to 0.015
Chromium (Cr), % 3.5 to 4.3
25 to 28.5
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 70.8 to 76
67.6 to 73.5
Manganese (Mn), % 0.2 to 0.4
0 to 0.4
Molybdenum (Mo), % 7.5 to 8.5
1.5 to 2.5
Nickel (Ni), % 0 to 0.3
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), % 0.15 to 0.65
0 to 0.040
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.26
Tungsten (W), % 2.3 to 3.0
0
Vanadium (V), % 1.5 to 1.8
0