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ASTM A232 Spring Steel vs. ACI-ASTM CK35MN Steel

Both ASTM A232 spring steel and ACI-ASTM CK35MN steel are iron alloys. They have 50% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 CK35MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540
190
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 14
40
Fatigue Strength, MPa 1040
270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 1790
650
Tensile Strength: Yield (Proof), MPa 1610
310

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
12
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
31
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.0
5.9
Embodied Energy, MJ/kg 28
81
Embodied Water, L/kg 51
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 64
22
Strength to Weight: Bending, points 42
21
Thermal Diffusivity, mm2/s 14
3.3
Thermal Shock Resistance, points 53
14

Alloy Composition

Carbon (C), % 0.48 to 0.53
0 to 0.035
Chromium (Cr), % 0.8 to 1.1
22 to 24
Copper (Cu), % 0
0 to 0.4
Iron (Fe), % 96.8 to 97.7
43.4 to 51.8
Manganese (Mn), % 0.7 to 0.9
0 to 2.0
Molybdenum (Mo), % 0
6.0 to 6.8
Nickel (Ni), % 0
20 to 22
Nitrogen (N), % 0
0.21 to 0.32
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.020
Vanadium (V), % 0.15 to 0.3
0