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ASTM A232 Spring Steel vs. ACI-ASTM CB30 Steel

Both ASTM A232 spring steel and ACI-ASTM CB30 steel are iron alloys. They have 79% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ASTM A232 spring steel and the bottom bar is ACI-ASTM CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 1790
500
Tensile Strength: Yield (Proof), MPa 1610
230

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
21
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
10
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.3
Embodied Energy, MJ/kg 28
33
Embodied Water, L/kg 51
130

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 64
18
Strength to Weight: Bending, points 42
18
Thermal Diffusivity, mm2/s 14
5.6
Thermal Shock Resistance, points 53
17

Alloy Composition

Carbon (C), % 0.48 to 0.53
0 to 0.3
Chromium (Cr), % 0.8 to 1.1
18 to 21
Copper (Cu), % 0
0 to 1.2
Iron (Fe), % 96.8 to 97.7
72.9 to 82
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Nickel (Ni), % 0
0 to 2.0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.5
Sulfur (S), % 0 to 0.035
0 to 0.040
Vanadium (V), % 0.15 to 0.3
0