Nickel Low-Temp vs Standard Gas-Shielded Flux-Core
E81T1-Ni1 for sub-zero toughness vs E71T-1 for standard structural. Choose based on service temperature requirements.
Key Differences
| Attribute | E81T1-Ni1 | E71T-1 |
|---|---|---|
| Tensile Strength | 80,000 psi | 70,000 psi |
| Impact Test | -40F (-40C) | -20F or 0F (varies) |
| Nickel Content | ~1% Ni for toughness | None |
| Cost | 2-3x more expensive | Standard pricing |
| Base Metal Match | HSLA, low-temp service steels | A36, A572, A992 structural |
| Shielding Gas | 75/25 Ar/CO2 or 100% CO2 | 75/25 Ar/CO2 or 100% CO2 |
| Polarity | DCEP | DCEP |
Use E81T1-Ni1 when:
Use E71T-1 when:
How E81T1-Ni1 and E71T-1 Work Together
If the structure or vessel will never see service below 0F, E71T-1 is the correct and cheaper choice. If the application involves arctic service, offshore platforms, LNG supports, or any design temperature below -20F, E81T1-Ni1 is required. The 1% nickel is what provides the low-temperature toughness. Both are gas-shielded with similar welding characteristics.
Common Mistake With Nickel Low-Temp
Specifying E81T1-Ni1 for ambient temperature applications because stronger sounds better. The 80 ksi tensile is overkill for A36 steel and the nickel content adds significant cost. Use E71T-1 for standard structural work at normal temperatures.
Where to Buy
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Data sourced from .