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SAE-AISI M4 Steel vs. S44625 Stainless Steel

Both SAE-AISI M4 steel and S44625 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is S44625 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 76
80
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
590

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1610
1440
Melting Onset (Solidus), °C 1560
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
17
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 25
14
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 14
2.8
Embodied Energy, MJ/kg 210
39
Embodied Water, L/kg 110
160

Common Calculations

PREN (Pitting Resistance) 30
30
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
21
Strength to Weight: Bending, points 23 to 45
20
Thermal Diffusivity, mm2/s 6.9
4.6
Thermal Shock Resistance, points 24 to 68
19

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.010
Chromium (Cr), % 3.8 to 4.8
25 to 27.5
Copper (Cu), % 0 to 0.25
0 to 0.2
Iron (Fe), % 75.9 to 81.4
69.4 to 74.3
Manganese (Mn), % 0.15 to 0.4
0 to 0.4
Molybdenum (Mo), % 4.3 to 5.5
0.75 to 1.5
Nickel (Ni), % 0 to 0.3
0 to 0.5
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0.2 to 0.45
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0