API petroleum high frequency straight seam welded pipe production line is mainly used to produce φ50～610mm oil and gas transmission pipes. The production line can produce high-strength oil and gas pipelines that meet ASTM and API SPEC 5L standards. The production line has the characteristics of high degree of automation, advanced technology, reliable equipment, complete technology, and mature production.

Process

Common process: material preparation → uncoiling → straight head pinching and leveling → shearing and welding → Accumulator → fine leveling → steel plate UT flaw detection → rough forming (F.F.) → fine forming → weld seam guiding → five-roller extrusion → high frequency welding → internal (external) burr removal → weld seam medium frequency annealing (NQT) → weld seam marking line spraying → pulling out → air cooling → water cooling → online ultrasonic flaw detection → sizing → sawing → roller table

Advanced Requirements:

Roller table after sawing → offline straightening → tube end chamfering mill→ water pressure test →

offline ultrasonic weld seam, pipes and pipe end flaw detection → weighing and length measurement → Spraying → labeling → automatic packaging → warehousing.

Pipeline API 5L steel grade, chemical composition and mechanical properties