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SAE-AISI M4 Steel vs. EN 1.4951 Stainless Steel

Both SAE-AISI M4 steel and EN 1.4951 stainless steel are iron alloys. They have 58% 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 M4 steel and the bottom bar is EN 1.4951 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
79
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
630

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1610
1410
Melting Onset (Solidus), °C 1560
1360
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 25
25
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 14
4.3
Embodied Energy, MJ/kg 210
61
Embodied Water, L/kg 110
190

Common Calculations

PREN (Pitting Resistance) 30
26
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
22
Strength to Weight: Bending, points 23 to 45
21
Thermal Diffusivity, mm2/s 6.9
3.9
Thermal Shock Resistance, points 24 to 68
14

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.040 to 0.080
Chromium (Cr), % 3.8 to 4.8
24 to 26
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
49.1 to 57
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
19 to 22
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.45
0 to 0.7
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0