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ASTM A229 Spring Steel vs. EN 1.1181 Steel

Both ASTM A229 spring steel and EN 1.1181 steel are iron alloys. Their average alloy composition is basically identical. 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 A229 spring steel and the bottom bar is EN 1.1181 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
19 to 20
Fatigue Strength, MPa 710 to 790
190 to 260
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1020 to 1140
350 to 390
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
560 to 620
Tensile Strength: Yield (Proof), MPa 1100 to 1230
280 to 380

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
42
Thermal Expansion, µm/m-K 12
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 46
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
90 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
210 to 380
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
20 to 22
Strength to Weight: Bending, points 40 to 43
19 to 21
Thermal Diffusivity, mm2/s 14
11
Thermal Shock Resistance, points 54 to 60
19 to 21

Alloy Composition

Carbon (C), % 0.55 to 0.85
0.32 to 0.39
Chromium (Cr), % 0
0 to 0.4
Iron (Fe), % 97.5 to 99
97.4 to 99.18
Manganese (Mn), % 0.3 to 1.2
0.5 to 0.8
Molybdenum (Mo), % 0
0 to 0.1
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.050
0 to 0.035