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ASTM A266 Carbon Steel vs. ASTM A231 Spring Steel

Both ASTM A266 carbon steel and ASTM A231 spring steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A266 carbon steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
540
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21 to 26
14
Fatigue Strength, MPa 170 to 200
1000
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34 to 43
46
Shear Modulus, GPa 73
73
Shear Strength, MPa 320 to 380
1080
Tensile Strength: Ultimate (UTS), MPa 500 to 600
1790
Tensile Strength: Yield (Proof), MPa 230 to 290
1570

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51 to 52
52
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1 to 8.2
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.0
Embodied Energy, MJ/kg 18 to 19
28
Embodied Water, L/kg 46 to 47
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
230
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
64
Strength to Weight: Bending, points 18 to 20
42
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 16 to 19
53