Method for manufacturing bacterial corrosion resistant X65 high efficiency welded pipe (HFW)

Abstract

The invention discloses a method for manufacturing a bacterial corrosion resistant X65 high efficiency welded pipe (HFW). The method sequentially includes the steps of unwinding butt welding, edge planing, molding, gas shielded high-frequency induction electric resistance welding, welded joint normalizing heat treatment, full pipe body aging heat treatment, sizing flying shear, straightening, ultrasonic inspection, X-ray inspection, water pressing, pipe end chamfering and finished product inspection. Small extrusion amount and small opening angle processes are adopted during forming, after aging heat treatment is combined, the welded pipe has small residual stress, the circumferential opening amount of the pipe body is only measured by a slit-ring method as -20mm - 0mm, low stress and negative value residual stress forming is realized, and the occurrence of sulfide stress corrosion cracking (SSCC) and other corrosion cracking situations of the pipe under the stress action can be prevented. After normalizing heat treatment, the pipe body is subjected to aging heat treatment, so that solid-soluble Cu in the pipe body and a welded joint diffusely precipitates a nanometer Cu-rich phase, and the nanometer Cu-rich phase is the key to improve the antimicrobial corrosion resistance of the welded pipe.

Description

Technical field: [0001] The invention belongs to the technical field of oil and gas pipes, in particular to a method for manufacturing an anti-bacterial corrosion X65 HFW welded pipe. Background technique: [0002] At present, most oil fields in my country have entered a period of high water cut, and the corrosion of pipeline materials caused by microorganisms in crude oil and soil has become increasingly prominent. In my country's oil and gas field, pipeline corrosion loss caused by microbial corrosion accounts for 15-30%. Microbial corrosion is often characterized by local rapid pitting and perforation. Its occurrence and development are difficult to predict in time and space, and its prevention and control are extremely difficult. Because of its extensiveness and destructiveness, microbial corrosion threatens the operation safety of pipelines and causes huge economic losses at the same time. [0003] In bacterial corrosion, sulfate reducing bacteria (SRB) corrosion is t...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic anti-bacterial corrosion seamless steel pipes have been tested in very few oil fields. However, due to the Cu-rich plate and technical bottlenecks in forming and welding, there has been no relevant research and development and product reports on anti-bacterial corrosion welded pipes.

Images