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AWS ER70S-A1 vs. ASTM A227 Spring Steel

Both AWS ER70S-A1 and ASTM A227 spring steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AWS ER70S-A1 and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
12
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 590
1720 to 2220
Tensile Strength: Yield (Proof), MPa 450
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
52
Thermal Expansion, µm/m-K 13
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 2.5
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
19
Embodied Water, L/kg 48
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
61 to 79
Strength to Weight: Bending, points 20
41 to 48
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 17
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.12
0.45 to 0.85
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 96.1 to 99.3
97.4 to 99.1
Manganese (Mn), % 0 to 1.3
0.3 to 1.3
Molybdenum (Mo), % 0.4 to 0.65
0
Nickel (Ni), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.3 to 0.7
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.050
Residuals, % 0 to 0.5
0