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EN 1.1221 Steel vs. ASTM A227 Spring Steel

Both EN 1.1221 steel and ASTM A227 spring steel are iron alloys. Their average alloy composition is basically identical. There are 30 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 EN 1.1221 steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 250
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10 to 21
12
Fatigue Strength, MPa 240 to 340
900 to 1160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Shear Strength, MPa 450 to 520
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 730 to 870
1720 to 2220
Tensile Strength: Yield (Proof), MPa 390 to 550
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
52
Thermal Expansion, µm/m-K 12
12

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 2.1
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 47
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 31
61 to 79
Strength to Weight: Bending, points 23 to 26
41 to 48
Thermal Diffusivity, mm2/s 13
14
Thermal Shock Resistance, points 23 to 28
55 to 71

Alloy Composition

Carbon (C), % 0.57 to 0.65
0.45 to 0.85
Chromium (Cr), % 0 to 0.4
0
Iron (Fe), % 97.1 to 98.8
97.4 to 99.1
Manganese (Mn), % 0.6 to 0.9
0.3 to 1.3
Molybdenum (Mo), % 0 to 0.1
0
Nickel (Ni), % 0 to 0.4
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.050

Comparable Variants