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SAE-AISI 9255 Steel vs. EN 1.4742 Stainless Steel

Both SAE-AISI 9255 steel and EN 1.4742 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 81% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 1.4742 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
17
Fatigue Strength, MPa 270
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 430
370
Tensile Strength: Ultimate (UTS), MPa 680
600
Tensile Strength: Yield (Proof), MPa 390
300

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 400
1000
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
19
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
9.0
Density, g/cm3 7.7
7.6
Embodied Carbon, kg CO2/kg material 1.5
2.2
Embodied Energy, MJ/kg 20
32
Embodied Water, L/kg 46
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
84
Resilience: Unit (Modulus of Resilience), kJ/m3 400
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
22
Strength to Weight: Bending, points 22
21
Thermal Diffusivity, mm2/s 13
5.1
Thermal Shock Resistance, points 21
21

Alloy Composition

Aluminum (Al), % 0
0.7 to 1.2
Carbon (C), % 0.51 to 0.59
0 to 0.12
Chromium (Cr), % 0
17 to 19
Iron (Fe), % 96.2 to 97
77.2 to 81.6
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 1.8 to 2.2
0.7 to 1.4
Sulfur (S), % 0 to 0.040
0 to 0.015