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ACI-ASTM CK3MCuN Steel vs. ASTM A231 Spring Steel

Both ACI-ASTM CK3MCuN steel and ASTM A231 spring steel are iron alloys. They have 55% 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 CK3MCuN steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
540
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
14
Fatigue Strength, MPa 250
1000
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
73
Tensile Strength: Ultimate (UTS), MPa 620
1790
Tensile Strength: Yield (Proof), MPa 290
1570

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1090
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 460
470
Thermal Conductivity, W/m-K 12
52
Thermal Expansion, µm/m-K 16
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 29
2.3
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.6
2.0
Embodied Energy, MJ/kg 76
28
Embodied Water, L/kg 190
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
230
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
64
Strength to Weight: Bending, points 20
42
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 14
53

Alloy Composition

Carbon (C), % 0 to 0.025
0.48 to 0.53
Chromium (Cr), % 19.5 to 20.5
0.8 to 1.1
Copper (Cu), % 0.5 to 1.0
0
Iron (Fe), % 49.5 to 56.3
96.7 to 97.7
Manganese (Mn), % 0 to 1.2
0.7 to 0.9
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 17.5 to 19.5
0
Nitrogen (N), % 0.18 to 0.24
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3