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ASTM A229 Spring Steel vs. EN 1.0308 Steel

Both ASTM A229 spring steel and EN 1.0308 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is EN 1.0308 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
100 to 130
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
7.8 to 28
Fatigue Strength, MPa 710 to 790
140 to 200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1020 to 1140
230 to 260
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
360 to 440
Tensile Strength: Yield (Proof), MPa 1100 to 1230
190 to 340

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
18
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
32 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
93 to 300
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
13 to 16
Strength to Weight: Bending, points 40 to 43
14 to 16
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 54 to 60
11 to 14

Alloy Composition

Carbon (C), % 0.55 to 0.85
0 to 0.17
Iron (Fe), % 97.5 to 99
98.2 to 100
Manganese (Mn), % 0.3 to 1.2
0 to 1.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.045

Comparable Variants