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A335 P11 seamless steel pipe production process

A335 p11 alloy pipe biggest advantage is 100% recovery, this is in line with environmental protection, energy saving, resource conservation strategy, national policy to encourage the expansion of high pressure p11 alloy seamless pipe applications. Over the years Henan Bebon Iron and Steel Co., Ltd. Mainly produce and export seamless steel pipe,ERW steel pipe. We have successively established direct sales agent relationship with Hengyang Valin, Baosteel, Chengsteel, Ansteel, Baogang.  A335 p11 alloy steel pipe inventory of more than 10,000 tons. Bebon with quality, reputation establish a good market share, we welcome the new and old customers come to do business.
Seamless steel pipe
According to its different manufacturing process, seamless steel pipe is divided into hot-rolled (extruded) seamless steel pipe and cold drawn (rolling) seamless steel pipe. Cold drawn (rolling) pipe is divided into circular pipe and shaped pipe.
Overview of the process
Hot-rolled (extruded seamless steel pipe): round pipe → heating → perforation → three roll skew rolling, continuous rolling or extrusion → off pipe → sizing (or reducing diameter) → cooling → billet → straightening → water pressure Test (or flaw detection) → mark → storage.
(Cold-rolled) → billet → heat treatment → straightening → Water pressure test (inspection) → mark → storage.
A335 P11 alloy pipe size and allowable deviation

Deviation level

Normalized outside diameter allowable deviation


±1.5%,min. ±0.75 mm


±1.0%。min.±0.50 mm


±0.75%.min.±0.30 mm


±0.50%。min.±0.10 mm

Alloy pipe weight formula::[(OD-wall thickness)*wall thickness]*0.02466=kg/m

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