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SAE-AISI M4 Steel vs. AISI 304N Stainless Steel

Both SAE-AISI M4 steel and AISI 304N stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is AISI 304N stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
620 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1610
1420
Melting Onset (Solidus), °C 1560
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 25
15
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 14
3.0
Embodied Energy, MJ/kg 210
43
Embodied Water, L/kg 110
150

Common Calculations

PREN (Pitting Resistance) 30
21
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
22 to 42
Strength to Weight: Bending, points 23 to 45
21 to 32
Thermal Diffusivity, mm2/s 6.9
4.2
Thermal Shock Resistance, points 24 to 68
14 to 26

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.080
Chromium (Cr), % 3.8 to 4.8
18 to 20
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
66.4 to 73.9
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 4.3 to 5.5
0
Nickel (Ni), % 0 to 0.3
8.0 to 10.5
Nitrogen (N), % 0
0.1 to 0.16
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.45
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0

Comparable Variants