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ASTM A227 Spring Steel vs. EN 1.6579 Steel

Both ASTM A227 spring steel and EN 1.6579 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is EN 1.6579 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
260 to 290
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12
11 to 14
Fatigue Strength, MPa 900 to 1160
380 to 570
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
850 to 980
Tensile Strength: Yield (Proof), MPa 1430 to 1850
600 to 910

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
440
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
3.7
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.7
Embodied Energy, MJ/kg 19
22
Embodied Water, L/kg 46
56

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
100 to 120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 61 to 79
30 to 35
Strength to Weight: Bending, points 41 to 48
25 to 28
Thermal Diffusivity, mm2/s 14
11
Thermal Shock Resistance, points 55 to 71
25 to 29

Alloy Composition

Carbon (C), % 0.45 to 0.85
0.32 to 0.38
Chromium (Cr), % 0
1.4 to 1.7
Iron (Fe), % 97.4 to 99.1
94.2 to 96.1
Manganese (Mn), % 0.3 to 1.3
0.6 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.35
Nickel (Ni), % 0
1.4 to 1.7
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.6
Sulfur (S), % 0 to 0.050
0 to 0.030

Comparable Variants