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ASTM A231 Spring Steel vs. EN 1.7239 Steel

Both ASTM A231 spring steel and EN 1.7239 steel are iron alloys. Their average alloy composition is basically identical. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A231 spring steel and the bottom bar is EN 1.7239 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540
200 to 480
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 1790
660 to 1990

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
420
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
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
20
Embodied Water, L/kg 51
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 64
23 to 71
Strength to Weight: Bending, points 42
21 to 45
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 53
19 to 59

Alloy Composition

Carbon (C), % 0.48 to 0.53
0.56 to 0.64
Chromium (Cr), % 0.8 to 1.1
0.7 to 1.0
Iron (Fe), % 96.7 to 97.7
96.8 to 98
Manganese (Mn), % 0.7 to 0.9
0.7 to 1.0
Molybdenum (Mo), % 0
0.060 to 0.15
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0.15 to 0.3
0