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P110 steel level high frequency straight welded pipe manufacturing method

A technology for straight seam welded pipes and manufacturing methods, which is applied to the manufacture of P110 steel grade oil casing pipes, P110 steel grade high frequency straight seam welded pipes, and oil pipes. It can solve problems such as high cost, unsatisfactory performance, and use requirements, and reduce Effects of decarburization, optimization of weld structure, and improvement of toughness

Inactive Publication Date: 2012-05-02
BAOJI PETROLEUM STEEL PIPE
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The products produced by the existing oil casing and oil pipe manufacturing technology are not only high in cost, but also cannot meet the requirements of complex well conditions. Therefore, the production and process of high-grade, high-performance high-frequency straight seam welding oil casing and oil pipe Research and manufacture of high-quality and low-cost oil well pipes has become a top priority, which has far-reaching significance for improving oilfield production efficiency and reducing production costs

Method used

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  • P110 steel level high frequency straight welded pipe manufacturing method
  • P110 steel level high frequency straight welded pipe manufacturing method
  • P110 steel level high frequency straight welded pipe manufacturing method

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Embodiment Construction

[0028] The present invention uses hot-rolled coils as raw materials, and its chemical composition is as follows in terms of weight percentage: C: 0.28, Si: 0.24, Mn: 1.30, Cr: 0.25, P≤0.012, S≤0.002, and the rest are Fe and unavoidable Impurities.

[0029] Specific manufacturing process:

[0030] (1) According to the design composition of the above raw materials, the molten steel is smelted in a converter and continuously cast into slabs;

[0031] (2) The slab is heated at 1200°C and held for 1.5 hours, and then rolled into a coil with a yield strength of 550-650MPa, a tensile strength greater than 650MPa, an elongation greater than 22%, and a yield ratio less than 0.88; the initial rolling temperature is 1050 ℃, the final rolling temperature is 850℃; and the grain size standard of the coil conforms to ASTM E112 NO.10 or finer;

[0032] (3) The coiled plate is then formed into a straight seam tubular shape by a continuous forming process, and the straight seam on the tubular...

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Abstract

A P110 steel level high frequency straight welded pipe manufacturing method comprises (1) taking hot-rolled coil as raw material; (2) shaping the coil into a straight seam pipe by continuous shaping techniques, welding the straight seam on the pipe by a high frequency inductive welding machine to produce a primary pipe, and after the welding, timely removing external and internal burrs of the primary pipe; (3) heating the primary pipe removed of burrs by a medium frequency induction furnace to 920-950 degrees centigrade and conveying it to a hot rolling and diameter reducing machine, rolling the primary pipe into pipe blanks with different apertures by hot mechanical rolling; (4) conducting whole-pipe quenching and tempering to the hot roller pipe blank to produce finished pipe; (5) conducting ultrasonic flaw detection and pipe end magnetic powder inspection to the finished pipe. The invention takes low steel level coil as raw material to produce primary pipe, produces pipe blanks with different diameter specifications by the primary pipe with the same specification, and produces oil casing product with high steel level and high performance by low steel level economical pipe blanks. The working efficiency is high. The production cost is low.

Description

technical field [0001] The invention belongs to the technical field of manufacturing high-frequency high-frequency straight seam welded pipes of high steel grades, in particular to a method for manufacturing P110 steel grade high-frequency straight seam welded pipes, in particular referring to the use of hot-rolled coils to produce the P110 steel grade petroleum sleeves stipulated in the API5CT standard The process method of pipe and oil pipe. Background technique [0002] Many oil fields in my country have entered the middle and late stages of development, and the development is becoming more and more difficult, and the well conditions are becoming more and more complex. Especially, the drilling of deep wells and ultra-deep wells puts forward higher requirements on the performance of casings. my country's high-strength oil casings The demand for pipes and oil pipes is increasing day by day. According to statistics, for every 1m of drilling, about 62Kg of oil well pipes are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/18C21D9/08C21D1/25
Inventor 杨忠文毕宗岳张峰张锦刚王涛介升旗何石磊白鹤
Owner BAOJI PETROLEUM STEEL PIPE
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