Q: What are the typical steps in a welded pipe mill process?
A: Uncoiling, leveling, forming (e.g., by rolls), welding, seam treatment (e.g., bead trimming), sizing, cutting, testing, and finishing.
Q: What is a "spiral welded pipe"?
A: A pipe made by helically winding and continuously welding a steel strip at a constant angle, producing long lengths with a helical seam.
Q: What does API 5L specify?
A: It's the American Petroleum Institute specification for line pipe used in oil and gas transportation, covering grades like B, X42, X52, X60, X70, X80, etc.
Q: What is a common carbon steel grade for structural welded pipe per ASTM?
A: ASTM A53 Grade B (Fy = 35 ksi) or ASTM A500 Grade B/C for structural tubing.
Q: What is the key difference between API 5L PSL1 and PSL2?
A: PSL2 has stricter requirements for chemical composition, mechanical properties (e.g., higher toughness), testing (e.g., Charpy V-notch), and mandatory non-destructive testing.
