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ASTM A229 Spring Steel vs. EN 1.7706 Steel

Both ASTM A229 spring steel and EN 1.7706 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 1.7706 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
17
Fatigue Strength, MPa 710 to 790
330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
690
Tensile Strength: Yield (Proof), MPa 1100 to 1230
500

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 400
440
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
40
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
3.7
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
2.3
Embodied Energy, MJ/kg 19
32
Embodied Water, L/kg 46
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
110
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
24
Strength to Weight: Bending, points 40 to 43
22
Thermal Diffusivity, mm2/s 14
11
Thermal Shock Resistance, points 54 to 60
20

Alloy Composition

Carbon (C), % 0.55 to 0.85
0.15 to 0.2
Chromium (Cr), % 0
1.2 to 1.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 97.5 to 99
94.7 to 97.1
Manganese (Mn), % 0.3 to 1.2
0.5 to 0.9
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 0.6
Sulfur (S), % 0 to 0.050
0 to 0.015
Vanadium (V), % 0
0.2 to 0.3