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AISI 440B Stainless Steel vs. SAE-AISI 9255 Steel

Both AISI 440B stainless steel and SAE-AISI 9255 steel are iron alloys. They have 82% of their average alloy composition in common. There are 29 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 AISI 440B stainless steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 3.0 to 18
21
Fatigue Strength, MPa 260 to 850
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 460 to 1110
430
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
680
Tensile Strength: Yield (Proof), MPa 430 to 1860
390

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 870
400
Melting Completion (Liquidus), °C 1480
1430
Melting Onset (Solidus), °C 1370
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
46
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.2
1.5
Embodied Energy, MJ/kg 31
20
Embodied Water, L/kg 120
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57 to 110
120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27 to 70
24
Strength to Weight: Bending, points 24 to 45
22
Thermal Diffusivity, mm2/s 6.1
13
Thermal Shock Resistance, points 27 to 70
21

Alloy Composition

Carbon (C), % 0.75 to 1.0
0.51 to 0.59
Chromium (Cr), % 16 to 18
0
Iron (Fe), % 78.2 to 83.3
96.2 to 97
Manganese (Mn), % 0 to 1.0
0.7 to 1.0
Molybdenum (Mo), % 0 to 0.75
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
1.8 to 2.2
Sulfur (S), % 0 to 0.015
0 to 0.040