| 1 | What international standards apply to structural ERW pipe? | ASTM A53, ASTM A500, ASTM A501, JIS G3444, and GB/T 3091-6. |
| 2 | Can structural ERW pipe be used in low-temperature environments? | Yes, provided it meets specific low-temperature impact toughness requirements, such as those for applications at -30°C-6. |
SAW pipes, including spiral welded, are used for large-diameter transmission lines.
| No. | Question | Answer (with Key Grades/Standards) |
|---|---|---|
| 3 | What are common material grades for spiral submerged arc welded pipe? | Includes Q235, Q345, L245, L290, X42, X46, X52, X60, X65, X70, and X80-3. |
| 4 | What is a key feature of the SAW process for large pipes? | It allows production of large-diameter pipes from steel coils, with diameters ranging from φ508mm to φ3048mm-3. |
| 5 | How is weld quality ensured in SAW pipe production? | Through 100% online ultrasonic testing of the spiral weld, followed by X-ray inspection of the T-joints and hydrostatic testing-3. |
