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ACI-ASTM CT15C Steel vs. ASTM A231 Spring Steel

Both ACI-ASTM CT15C steel and ASTM A231 spring steel are iron alloys. They have 47% 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 CT15C steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
540
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
14
Fatigue Strength, MPa 130
1000
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 500
1790
Tensile Strength: Yield (Proof), MPa 190
1570

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1080
420
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1360
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 12
52
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 36
2.3
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 6.1
2.0
Embodied Energy, MJ/kg 88
28
Embodied Water, L/kg 190
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
230
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
64
Strength to Weight: Bending, points 17
42
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 12
53

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.48 to 0.53
Chromium (Cr), % 19 to 21
0.8 to 1.1
Iron (Fe), % 40.3 to 49.2
96.7 to 97.7
Manganese (Mn), % 0.15 to 1.5
0.7 to 0.9
Nickel (Ni), % 31 to 34
0
Niobium (Nb), % 0.5 to 1.5
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3