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SAE-AISI M4 Steel vs. SAE-AISI P4 Steel

Both SAE-AISI M4 steel and SAE-AISI P4 steel are iron alloys. They have 84% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is SAE-AISI P4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
74
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
390 to 1980

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1610
1460
Melting Onset (Solidus), °C 1560
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
41
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
4.4
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 14
1.8
Embodied Energy, MJ/kg 210
23
Embodied Water, L/kg 110
68

Common Calculations

PREN (Pitting Resistance) 30
7.0
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
14 to 70
Strength to Weight: Bending, points 23 to 45
15 to 45
Thermal Diffusivity, mm2/s 6.9
11
Thermal Shock Resistance, points 24 to 68
13 to 64

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.12
Chromium (Cr), % 3.8 to 4.8
4.0 to 5.3
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 75.9 to 81.4
92.3 to 95.3
Manganese (Mn), % 0.15 to 0.4
0.2 to 0.6
Molybdenum (Mo), % 4.3 to 5.5
0.4 to 1.0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.1 to 0.4
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