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SAE-AISI A4 Steel vs. S39277 Stainless Steel

Both SAE-AISI A4 steel and S39277 stainless steel are iron alloys. They have 64% 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 A4 steel and the bottom bar is S39277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
930

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
23
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
4.2
Embodied Energy, MJ/kg 24
59
Embodied Water, L/kg 59
180

Common Calculations

PREN (Pitting Resistance) 5.3
43
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
33
Strength to Weight: Bending, points 23 to 46
27
Thermal Diffusivity, mm2/s 11
4.2
Thermal Shock Resistance, points 23 to 67
26

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.025
Chromium (Cr), % 0.9 to 2.2
24 to 26
Copper (Cu), % 0 to 0.25
1.2 to 2.0
Iron (Fe), % 92 to 95.5
56.8 to 64.3
Manganese (Mn), % 1.8 to 2.2
0 to 0.8
Molybdenum (Mo), % 0.9 to 1.4
3.0 to 4.0
Nickel (Ni), % 0 to 0.3
6.5 to 8.0
Nitrogen (N), % 0
0.23 to 0.33
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.0020
Tungsten (W), % 0
0.8 to 1.2