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ASTM A232 Spring Steel vs. EN 1.7725 Steel

Both ASTM A232 spring steel and EN 1.7725 steel are iron alloys. Their average alloy composition is basically identical. 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 ASTM A232 spring steel and the bottom bar is EN 1.7725 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540
250 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
14
Fatigue Strength, MPa 1040
390 to 550
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 1790
830 to 1000
Tensile Strength: Yield (Proof), MPa 1610
610 to 860

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
440
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
2.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.8
Embodied Energy, MJ/kg 28
24
Embodied Water, L/kg 51
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
110 to 130
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 64
29 to 35
Strength to Weight: Bending, points 42
25 to 28
Thermal Diffusivity, mm2/s 14
11
Thermal Shock Resistance, points 53
24 to 29

Alloy Composition

Carbon (C), % 0.48 to 0.53
0.27 to 0.34
Chromium (Cr), % 0.8 to 1.1
1.3 to 1.7
Iron (Fe), % 96.8 to 97.7
95.7 to 97.5
Manganese (Mn), % 0.7 to 0.9
0.6 to 1.0
Molybdenum (Mo), % 0
0.3 to 0.5
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.6
Sulfur (S), % 0 to 0.035
0 to 0.030
Vanadium (V), % 0.15 to 0.3
0.050 to 0.15