A kind of manufacturing method of anti-bacterial corrosion x65 HFW welded pipe

Abstract

The invention discloses a method for manufacturing an anti-bacterial corrosion X65HFW welded pipe, which sequentially includes uncoiling butt welding, planing, forming, gas-protected high-frequency induction resistance welding, normalizing heat treatment of weld seams, aging heat treatment of the whole pipe body, sizing and flying Trimming, straightening, ultrasonic inspection, X-ray inspection, hydraulic pressure, pipe end chamfering and finished product inspection. The present invention adopts small extrusion amount and small opening angle technology when forming, combined with aging heat treatment, the welded pipe has small residual stress, and the circumferential opening of the pipe body measured by the cutting ring method is only -20 ~ 0mm, low stress and negative residual stress forming , can prevent corrosion and cracking of pipes such as SSCC under stress. After the normalizing heat treatment, aging heat treatment is performed on the pipe body, so that the solid solution Cu in the pipe body and welded joints is dispersed and precipitated into a nano-Cu-rich phase. This nano-Cu-rich phase is the core key to improving the anti-microbial corrosion performance 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...

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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.

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