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Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm

A manufacturing method and technology of seamless steel pipes, which are applied in the fields of corrosion-resistant materials and special petroleum pipes, can solve the problems of easy cracks, quenching and bending deformation of long steel pipes, etc., so as to refine the grain size, reduce residual stress, and reduce unfavorable effect of influence

Active Publication Date: 2009-04-29
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology

[0005] In order to solve the problems existing in the above-mentioned technologies, the purpose of the present invention is to provide a method for manufacturing large-diameter high-grade corrosion-resistant seamless steel pipes with a diameter of Φ219.0-Φ460.0 mm, which is beneficial to solve the corrosion problem in the process of oil and gas transportation And develop new steel production methods such as smelting, rolling and heat treatment; at the same time solve the quality problems of quenching bending deformation and cracks in long steel pipes; overcome the technical problems of high-strength anti-HIC corrosion

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  • Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm
  • Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm
  • Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm

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Embodiment Construction

[0013] The present invention relates to a method for manufacturing a large-diameter high-grade corrosion-resistant seamless steel pipe with a diameter of Φ219.0 to Φ460.0 mm. The method includes the following steps:

[0014] 1. Steelmaking

[0015] Process flow: electric furnace / induction furnace smelting to ladle refining to VD to wire feeding treatment to tube billet continuous casting to tube billet inspection;

[0016] The new technologies adopted are:

[0017] a. Pure steel technology and microalloying technology

[0018] Using direct reduced iron, scrap steel and molten iron as raw materials, the weight percent of steel grades configured is: C0.08~0.15%, Si 0.15~0.45%, Mn 1.00~1.40%, P≤0.010%, S≤0.003%, Cu ≤0.20%, Ni≤0.10%, Als 0.015~0.050%, N 0.030~0.10%, Nb 0.025~0.090%, V0.02~0.10%, the balance is Fe and unavoidable impurities, and the proportion of molten iron is appropriately increased , to ensure high purity steel.

[0019] Foam slag smelting, using CaO-Al 2 o...

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Abstract

The invention provides a production method of a large caliber high steel-grade corrosion-resistant seamless steel tube with the diameter of phi 219.0-phi460.0mm, which comprises the steps of the techniques of: steel making, tube rolling, thermal treatment and processing of the steel tube, and the like, and produces the large caliber high steel-grade corrosion-resistant seamless steel tube with the diameter of phi 219.0-phi460.0mm. The method has the effects of solving the problem of extremely unfavorable influence of the harmful elements such as P, S, and the like on the corrosion resistance of a petroleum-special tube and obtaining a high-quality round billet, adopts the combination of phi 460 three-roller retained mandrel POF rolling mill with high-end thermal rolling control technique to obtain fine quality tube bodies with different sizes, and obtains pipeline tubes with eligible surface quality and combination property by reasonable thermal treatment technique and the control technique of the residual stress of the steel tube, which not only has high strength and excellent corrosion-resistant property but also has good toughness. The invention has the beneficial effects that the steel tube has good physical-chemical properties, high tube body size precision, and convenience for use as well as being beneficial for the safety of long-distance delivery ducts, and can be widely used for the acid oil-gas fields containing hydrogen sulfide.

Description

technical field [0001] The invention relates to corrosion-resistant materials and special petroleum pipe technology, especially a pipe with a diameter of Φ219.0~ A method for manufacturing 460.0mm large-diameter high-grade corrosion-resistant seamless steel pipes. Background technique [0002] Corrosion is a common phenomenon in the oil and gas industry, often causing significant economic losses to oil and gas fields and seriously polluting the environment. Common corrosion damage in sour oil and gas fields is usually divided into two types: one is uniform corrosion and local corrosion caused by the dissolution of anode iron during the electrochemical reaction process, which is manifested as local corrosion such as wall thickness reduction and pitting perforation of metal facilities that are increasing day by day The other type is the cathodic precipitation of hydrogen atoms during the electrochemical reaction process, and after entering the steel, it leads to two differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21B37/74B21B37/16B21B37/78C22C38/16C22C38/12C21D9/08C21D9/70C21D11/00F16L9/02B22D11/00
Inventor 许文妍邱锋朱群星孙炜李艳郑飞王庆国刘永立王振祥唐昭平魏学志
Owner TIANJIN STEEL PIPE MFG CO LTD
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