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EN 1.0070 Steel vs. ASTM A231 Spring Steel

Both EN 1.0070 steel and ASTM A231 spring 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 (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.0070 steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
540
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 9.1
14
Fatigue Strength, MPa 210
1000
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 440
1080
Tensile Strength: Ultimate (UTS), MPa 740
1790
Tensile Strength: Yield (Proof), MPa 350
1570

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 53
52
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 7.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.7
2.3
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.0
Embodied Energy, MJ/kg 18
28
Embodied Water, L/kg 45
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 56
230
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
64
Strength to Weight: Bending, points 23
42
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 23
53

Alloy Composition

Carbon (C), % 0
0.48 to 0.53
Chromium (Cr), % 0
0.8 to 1.1
Iron (Fe), % 99.876 to 100
96.7 to 97.7
Manganese (Mn), % 0
0.7 to 0.9
Nitrogen (N), % 0 to 0.014
0
Phosphorus (P), % 0 to 0.055
0 to 0.040
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.055
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3