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SAE-AISI A9 Steel vs. EN 1.4945 Stainless Steel

Both SAE-AISI A9 steel and EN 1.4945 stainless steel are iron alloys. They have 69% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is EN 1.4945 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 74
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
640 to 740

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1460
1490
Melting Onset (Solidus), °C 1410
1440
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 35
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
30
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 4.7
5.0
Embodied Energy, MJ/kg 70
73
Embodied Water, L/kg 82
150

Common Calculations

PREN (Pitting Resistance) 10
23
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 73
22 to 25
Strength to Weight: Bending, points 24 to 46
20 to 22
Thermal Diffusivity, mm2/s 9.6
3.7
Thermal Shock Resistance, points 25 to 66
14 to 16

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.040 to 0.1
Chromium (Cr), % 4.8 to 5.5
15.5 to 17.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
57.9 to 65.7
Manganese (Mn), % 0 to 0.5
0 to 1.5
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Nitrogen (N), % 0
0.060 to 0.14
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 1.0 to 1.2
0.3 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 0.8 to 1.4
0