An economical j55 seamless pipe with corrosion resistance and its manufacturing method

Abstract

The invention provides an economical corrosion-resistant J55 seamless pipe and a manufacturing method thereof. The economical corrosion-resistant J55 seamless pipe comprises, by weight, 0.28%-0.33% ofC, 0.15%-0.40% of Si, 1.30%-1.50% of Mn, 0.20%-0.40% of Cr, 0.15%-0.25% of Cu, 0.01%-0.03% of Ti, no more than 0.018% of P, no more than 0.010% of S, and the balance Fe and inevitable impurities. Themanufacturing method of the economical corrosion-resistant J55 seamless pipe comprises the steps that a pipe blank is obtained through smelting in a converter, refining outside the converter, vacuumtreatment, continuous casting and continuous rolling, the pipe blank is heated to the temperature of 1200-1260 DEG C in an annular furnace, and MPM continuous rolling is conducted, wherein the temperature after perforation is 1160-1200 DEG C, and the sizing temperature is 720-750 DEG C. The economical corrosion-resistant J55 seamless pipe is uniform in structure and good in mechanical property; and the manufacturing technique of the economical corrosion-resistant J55 seamless pipe is easy to implement and economical.

Description

technical field [0001] The invention belongs to the field of corrosion-resistant materials and seamless steel pipes, in particular to 2 performance seamless. Background technique [0002] With the continuous development of major oil and gas fields in my country, the problems and conditions are becoming increasingly severe and harsh, especially CO 2 Corrosion is a particularly serious problem, which not only seriously affects the production of oil and gas, but also causes serious economic losses. Domestic and foreign studies have shown that CO 2 It is extremely corrosive, and the use of 13Cr, 22Cr and other stainless steel tubes containing high alloy elements is considered to be anti-CO 2 The ideal material for corrosion, there are also reports on the application of 3Cr steel. However, it contains a large number of expensive elements, which greatly increases the manufacturing cost of steel pipes, thus limiting their wide application in oil and gas fields. J55 steel grade ...

AI Technical Summary

Problems solved by technology

[0003] "110ksi level high resistance to CO 2 Corrosion oil casing and its manufacturing method" (CN102851607A), this patent mainly solves the problem of low toughness of oil casing in the production process through microalloying of low carbon and nitrogen, but it is a high Cr martensitic stainless steel

[0004] Invented "rare earth-containing anti-CO 2 Economical casing material and its preparation method" (CN103131952A), this patent manufactures economical casing by adding rare earth elements, adding heat treatment process in the production process, which increases the production cost, but the disadvantage is that its strength is low

[0006] "Anti-CO 2 Corrosion seamless steel pipe and its manufacturing method" (CN103952634A), the patent adopts forging method by adding alloy elements such as Cr, Mo, Nb, Cu, Ni, etc., and adopts normalizing heat treatment, the cost is high, and its yield strength is above 245MPa

Images