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AWS ER80S-Ni3 vs. AWS ER70S-A1

Both AWS ER80S-Ni3 and AWS ER70S-A1 are iron alloys. Both are furnished in the post-weld heat treated (PWHT) condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is AWS ER80S-Ni3 and the bottom bar is AWS ER70S-A1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
22
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 630
590
Tensile Strength: Yield (Proof), MPa 530
450

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
50
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.5
Embodied Energy, MJ/kg 23
20
Embodied Water, L/kg 52
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
120
Resilience: Unit (Modulus of Resilience), kJ/m3 740
540
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
21
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 19
17

Alloy Composition

Carbon (C), % 0 to 0.12
0 to 0.12
Copper (Cu), % 0 to 0.35
0 to 0.35
Iron (Fe), % 93.2 to 96.6
96.1 to 99.3
Manganese (Mn), % 0 to 1.3
0 to 1.3
Molybdenum (Mo), % 0
0.4 to 0.65
Nickel (Ni), % 3.0 to 3.8
0 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0.4 to 0.8
0.3 to 0.7
Sulfur (S), % 0 to 0.025
0 to 0.025
Residuals, % 0
0 to 0.5