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EN 1.4740 Stainless Steel vs. SAE-AISI A9 Steel

Both EN 1.4740 stainless steel and SAE-AISI A9 steel are iron alloys. They have 87% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.4740 stainless steel and the bottom bar is SAE-AISI A9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 18
35
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
7.0
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.3
4.7
Embodied Energy, MJ/kg 32
70
Embodied Water, L/kg 120
82

Common Calculations

PREN (Pitting Resistance) 18
10
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 4.8
9.6

Alloy Composition

Carbon (C), % 0.3 to 0.5
0.45 to 0.55
Chromium (Cr), % 16 to 19
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 75.4 to 82.7
87 to 90.5
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
1.3 to 1.8
Nickel (Ni), % 0 to 1.0
1.3 to 1.8
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 1.0 to 2.5
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4