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SAE-AISI P4 Steel vs. S41045 Stainless Steel

Both SAE-AISI P4 steel and S41045 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 24 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 P4 steel and the bottom bar is S41045 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 390 to 1980
430

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
29
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
8.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.2
Embodied Energy, MJ/kg 23
31
Embodied Water, L/kg 68
100

Common Calculations

PREN (Pitting Resistance) 7.0
13
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 14 to 70
16
Strength to Weight: Bending, points 15 to 45
16
Thermal Diffusivity, mm2/s 11
7.8
Thermal Shock Resistance, points 13 to 64
16

Alloy Composition

Carbon (C), % 0 to 0.12
0 to 0.030
Chromium (Cr), % 4.0 to 5.3
12 to 13
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.3 to 95.3
83.8 to 88
Manganese (Mn), % 0.2 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.6
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.1 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030