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SAE-AISI 9255 Steel vs. Grey Cast Iron

Both SAE-AISI 9255 steel and grey cast iron are iron alloys. They have a very high 96% of their average alloy composition in common. There are 30 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 grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
180
Elongation at Break, % 21
9.6
Fatigue Strength, MPa 270
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
69
Shear Strength, MPa 430
180 to 610
Tensile Strength: Ultimate (UTS), MPa 680
160 to 450
Tensile Strength: Yield (Proof), MPa 390
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Melting Completion (Liquidus), °C 1430
1380
Melting Onset (Solidus), °C 1390
1180
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 46
46
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
1.9
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
21
Embodied Water, L/kg 46
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 400
27 to 240
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
5.8 to 17
Strength to Weight: Bending, points 22
8.7 to 17
Thermal Diffusivity, mm2/s 13
13
Thermal Shock Resistance, points 21
6.0 to 17

Alloy Composition

Carbon (C), % 0.51 to 0.59
3.1 to 3.4
Iron (Fe), % 96.2 to 97
92.1 to 93.9
Manganese (Mn), % 0.7 to 1.0
0.5 to 0.7
Phosphorus (P), % 0 to 0.035
0 to 0.9
Silicon (Si), % 1.8 to 2.2
2.5 to 2.8
Sulfur (S), % 0 to 0.040
0 to 0.15