Q: What is the minimum yield strength of GB/T 9711.1 Grade L245 welded pipe? A: GB/T 9711.1 Grade L245 (equivalent to API 5L Grade B) has a minimum yield strength of 245 MPa, which is widely used in oil and gas transmission pipelines in China.
Q: Can ASTM A333 Grade 6 welded pipe be used for low-temperature applications? A: Yes, ASTM A333 Grade 6 is a carbon steel welded pipe designed for low-temperature service, with a minimum operating temperature of -45°C (-49°F), suitable for cryogenic liquid and gas pipelines.
Q: What is the material composition of EN 10219-1 Grade S235JR welded pipe? A: EN 10219-1 Grade S235JR is a carbon structural steel welded pipe, with a maximum carbon content of 0.17%, manganese content of 1.40%, and minimum yield strength of 235 MPa, used for general structural and pipeline applications.
Q: What is the difference between ERW and submerged arc welded (SAW) API 5L X60 pipes? A: ERW pipes are manufactured by electric resistance welding, with high production efficiency and suitable for small-to-medium diameter pipes. SAW pipes are welded by submerged arc welding, with a thicker weld seam, higher strength, and suitable for large-diameter, high-pressure pipelines.
Q: Can GB/T 3091 welded pipes be used for natural gas distribution? A: Yes, GB/T 3091 hot-dip galvanized welded pipes (Grade Q235B or Q355B) can be used for low-pressure natural gas distribution pipelines (pressure ≤0.4 MPa), as they have good corrosion resistance and airtightness.
