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SAE-AISI M7 Steel vs. SAE-AISI P20 Steel

Both SAE-AISI M7 steel and SAE-AISI P20 steel are iron alloys. They have 85% 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 M7 steel and the bottom bar is SAE-AISI P20 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 77
73
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
540 to 1050

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1560
1460
Melting Onset (Solidus), °C 1510
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 28
45
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 18
2.8
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
1.6
Embodied Energy, MJ/kg 130
21
Embodied Water, L/kg 100
52

Common Calculations

PREN (Pitting Resistance) 35
2.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 76
19 to 37
Strength to Weight: Bending, points 23 to 47
19 to 29
Thermal Diffusivity, mm2/s 7.8
12
Thermal Shock Resistance, points 24 to 69
18 to 35

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.28 to 0.4
Chromium (Cr), % 3.5 to 4.0
0.4 to 2.0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 79.8 to 83.8
95.2 to 98.5
Manganese (Mn), % 0.15 to 0.4
0.35 to 0.71
Molybdenum (Mo), % 8.2 to 9.2
0.3 to 0.55
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.55
0.2 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0

Comparable Variants