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AWS ER70S-A1 vs. ASTM A229 Spring Steel

Both AWS ER70S-A1 and ASTM A229 spring steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 27 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 AWS ER70S-A1 and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
14
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 590
1690 to 1890
Tensile Strength: Yield (Proof), MPa 450
1100 to 1230

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
50
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 230
Resilience: Unit (Modulus of Resilience), kJ/m3 540
3260 to 4080
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
60 to 67
Strength to Weight: Bending, points 20
40 to 43
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 17
54 to 60

Alloy Composition

Carbon (C), % 0 to 0.12
0.55 to 0.85
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 96.1 to 99.3
97.5 to 99
Manganese (Mn), % 0 to 1.3
0.3 to 1.2
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