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SAE-AISI 9255 Steel vs. SAE-AISI 8660 Steel

Both SAE-AISI 9255 steel and SAE-AISI 8660 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is SAE-AISI 8660 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
12
Fatigue Strength, MPa 270
340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 430
390
Tensile Strength: Ultimate (UTS), MPa 680
660
Tensile Strength: Yield (Proof), MPa 390
550

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 46
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
2.6
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 46
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
73
Resilience: Unit (Modulus of Resilience), kJ/m3 400
800
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
23
Strength to Weight: Bending, points 22
21
Thermal Diffusivity, mm2/s 13
10
Thermal Shock Resistance, points 21
19

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.56 to 0.64
Chromium (Cr), % 0
0.4 to 0.6
Iron (Fe), % 96.2 to 97
96.4 to 97.6
Manganese (Mn), % 0.7 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 1.8 to 2.2
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040