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EN 1.7231 Steel vs. ASTM A229 Spring Steel

Both EN 1.7231 steel and ASTM A229 spring steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.7231 steel and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
490 to 550
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 12
14
Fatigue Strength, MPa 360 to 500
710 to 790
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 790 to 930
1690 to 1890
Tensile Strength: Yield (Proof), MPa 570 to 800
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
400
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
50
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
19
Embodied Water, L/kg 51
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 100
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 870 to 1700
3260 to 4080
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 33
60 to 67
Strength to Weight: Bending, points 24 to 27
40 to 43
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 23 to 27
54 to 60

Alloy Composition

Carbon (C), % 0.38 to 0.45
0.55 to 0.85
Chromium (Cr), % 0.8 to 1.2
0
Iron (Fe), % 96.4 to 98.1
97.5 to 99
Manganese (Mn), % 0.6 to 1.0
0.3 to 1.2
Molybdenum (Mo), % 0.15 to 0.3
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.6
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.050