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SAE-AISI A4 Steel vs. AISI 303 Stainless Steel

Both SAE-AISI A4 steel and AISI 303 stainless steel are iron alloys. They have 74% 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 AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
600 to 690

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
15
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
3.0
Embodied Energy, MJ/kg 24
42
Embodied Water, L/kg 59
140

Common Calculations

PREN (Pitting Resistance) 5.3
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
21 to 25
Strength to Weight: Bending, points 23 to 46
20 to 22
Thermal Diffusivity, mm2/s 11
4.4
Thermal Shock Resistance, points 23 to 67
13 to 15

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.15
Chromium (Cr), % 0.9 to 2.2
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92 to 95.5
67.3 to 74.9
Manganese (Mn), % 1.8 to 2.2
0 to 2.0
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
8.0 to 10
Phosphorus (P), % 0 to 0.030
0 to 0.2
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35

Comparable Variants