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SAE-AISI 9255 Steel vs. EN 1.4729 Stainless Steel

Both SAE-AISI 9255 steel and EN 1.4729 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 86% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is EN 1.4729 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
260
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
15
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 400
850
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 46
24
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
7.5
Density, g/cm3 7.7
7.6
Embodied Carbon, kg CO2/kg material 1.5
2.1
Embodied Energy, MJ/kg 20
29
Embodied Water, L/kg 46
100

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 13
6.5

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.3 to 0.5
Chromium (Cr), % 0
12 to 14
Iron (Fe), % 96.2 to 97
80.4 to 86.7
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 1.8 to 2.2
1.0 to 2.5
Sulfur (S), % 0 to 0.040
0 to 0.030