THY-58Ni1 (E71T8-Ni1-J)
E71T8-Ni1-J Self-Shielded Flux-Cored Wire | Low-Alloy Steel
Application
- Shipbuilding
- Pressure Vessel
- Energy Industry
- Heavy Machinery
DETAILS
THY-58Ni1 (E71T8-Ni1-J) is a low-alloy steel self-shielded flux-cored wire. Suitable for all-position welding, particularly vertical-down progression, it offers exceptional low-temperature impact toughness without requiring external shielding gas.
Features
- Self-shielded (innershield) flux-cored design requiring no external shielding gas
- Exceptional all-position welding performance, specifically optimized for vertical-down welding
- Superior low-temperature impact toughness at -40°C ("J" classification) with ~1% Nickel addition
- High deposition efficiency, fast-freezing slag, and smooth arc with easy slag removal
Typical Applications
- Cross-country oil and gas pipeline construction and field joint welding
- Structural steel erection, bridge construction, and offshore platform fabrication
- Outdoor field repairs, storage tanks, and heavy equipment welding
- Low-temperature pressure piping and heavy structural joints
- Joining high-strength low-alloy steels requiring high toughness in harsh field conditions
Welding Positions
- PA / PB / PC / PD / PE / PF
WARNING
-
Use DC⁻ only.
-
Wire extension should be maintained at 20 mm.
| Test Item | Rm (MPa) | Rel / RP₀.₂ (MPa) | A （%） | KV₂ （J） -40℃ |
|---|---|---|---|---|
| Requirement | 490-670 | ≥390 | ≥18 | ≥27 |
| Typical Result | 495 | 423 | 27 | 170 |
| Element | C | Mn | Si | S | P | Ni | Mo | Al |
|---|---|---|---|---|---|---|---|---|
| Requirement (%) | ≤0.12 | ≤1.75 | ≤0.80 | ≤0.030 | ≤0.030 | ≤0.80-1.20 | ≤0.35 | ≤1.8 |
| Typical Result (%) | 0.03 | 0.87 | 0.03 | 0.004 | 0.011 | 0.94 | 0.01 | 0.94 |
| Diameter (mm) | 2.0 |
|---|---|
| Current (A) | 150-230 |