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ACI-ASTM CK20 Steel vs. SAE-AISI 9255 Steel

Both ACI-ASTM CK20 steel and SAE-AISI 9255 steel are iron alloys. They have 54% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CK20 steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 37
21
Fatigue Strength, MPa 220
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
72
Tensile Strength: Ultimate (UTS), MPa 530
680
Tensile Strength: Yield (Proof), MPa 260
390

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Mechanical, °C 1100
400
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
46
Thermal Expansion, µm/m-K 15
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 25
2.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.4
1.5
Embodied Energy, MJ/kg 62
20
Embodied Water, L/kg 190
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
120
Resilience: Unit (Modulus of Resilience), kJ/m3 170
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 3.7
13
Thermal Shock Resistance, points 13
21

Alloy Composition

Carbon (C), % 0 to 0.2
0.51 to 0.59
Chromium (Cr), % 23 to 27
0
Iron (Fe), % 46.7 to 58
96.2 to 97
Manganese (Mn), % 0 to 2.0
0.7 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 19 to 22
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.0
1.8 to 2.2
Sulfur (S), % 0 to 0.040
0 to 0.040