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SAE-AISI A4 Steel vs. S44537 Stainless Steel

Both SAE-AISI A4 steel and S44537 stainless steel are iron alloys. They have 76% 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 S44537 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
79
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
510

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1450
1480
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
21
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
19
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
3.4
Embodied Energy, MJ/kg 24
50
Embodied Water, L/kg 59
140

Common Calculations

PREN (Pitting Resistance) 5.3
26
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
18
Strength to Weight: Bending, points 23 to 46
18
Thermal Diffusivity, mm2/s 11
5.6
Thermal Shock Resistance, points 23 to 67
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Carbon (C), % 1.0 to 1.1
0 to 0.030
Chromium (Cr), % 0.9 to 2.2
20 to 24
Copper (Cu), % 0 to 0.25
0 to 0.5
Iron (Fe), % 92 to 95.5
69 to 78.6
Lanthanum (La), % 0
0.040 to 0.2
Manganese (Mn), % 1.8 to 2.2
0 to 0.8
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.040
Phosphorus (P), % 0 to 0.030
0 to 0.050
Silicon (Si), % 0 to 0.5
0.1 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.0060
Titanium (Ti), % 0
0.020 to 0.2
Tungsten (W), % 0
1.0 to 3.0