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SAE-AISI 9255 Steel vs. EN 1.4581 Stainless Steel

Both SAE-AISI 9255 steel and EN 1.4581 stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 1.4581 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
150
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
28
Fatigue Strength, MPa 270
150
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 680
510
Tensile Strength: Yield (Proof), MPa 390
210

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 400
990
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
21
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
4.2
Embodied Energy, MJ/kg 20
59
Embodied Water, L/kg 46
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 400
110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
18
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 13
3.9
Thermal Shock Resistance, points 21
12

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.070
Chromium (Cr), % 0
18 to 20
Iron (Fe), % 96.2 to 97
61.4 to 71
Manganese (Mn), % 0.7 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 2.5
Nickel (Ni), % 0
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 1.8 to 2.2
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.030