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ACI-ASTM CF20 Steel vs. ACI-ASTM CB30 Steel

Both ACI-ASTM CF20 steel and ACI-ASTM CB30 steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a moderately high 91% of their average alloy composition in common. There are 29 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 CF20 steel and the bottom bar is ACI-ASTM CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 530
500
Tensile Strength: Yield (Proof), MPa 250
230

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 970
940
Melting Completion (Liquidus), °C 1420
1430
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
21
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 16
10
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.3
Embodied Energy, MJ/kg 44
33
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 20
20
Resilience: Unit (Modulus of Resilience), kJ/m3 160
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 4.3
5.6
Thermal Shock Resistance, points 11
17

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.3
Chromium (Cr), % 18 to 21
18 to 21
Copper (Cu), % 0
0 to 1.2
Iron (Fe), % 64.2 to 74
72.9 to 82
Manganese (Mn), % 0 to 1.5
0 to 1.0
Nickel (Ni), % 8.0 to 11
0 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.040