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ACI-ASTM CK20 Steel vs. ASTM A232 Spring Steel

Both ACI-ASTM CK20 steel and ASTM A232 spring steel are iron alloys. They have 54% 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 ACI-ASTM CK20 steel and the bottom bar is ASTM A232 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
540
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 37
14
Fatigue Strength, MPa 220
1040
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 530
1790
Tensile Strength: Yield (Proof), MPa 260
1610

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
52
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 25
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
2.0
Embodied Energy, MJ/kg 62
28
Embodied Water, L/kg 190
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
250
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
64
Strength to Weight: Bending, points 19
42
Thermal Diffusivity, mm2/s 3.7
14
Thermal Shock Resistance, points 13
53

Alloy Composition

Carbon (C), % 0 to 0.2
0.48 to 0.53
Chromium (Cr), % 23 to 27
0.8 to 1.1
Iron (Fe), % 46.7 to 58
96.8 to 97.7
Manganese (Mn), % 0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 19 to 22
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.035
Vanadium (V), % 0
0.15 to 0.3