Technology for smelting TWIP steel used in expansion pipe and manufacturing steel pipe

Abstract

The invention relates to the field of metal material and petroleum natural gas industries, and particularly relates to a technology for smelting TWIP steel used in an expansion pipe and manufacturinga steel pipe. The technology is characterized in that materials comprise the following components in percentage by mass: 0.05-0.07% of C, 24-26% of Mn, 2% of Al, 0.5-1.5% of Si, not greater than 0.015% of P, not greater than 0.15% of S, and the balance Fe. According to the technology, the processes of component designing, smelting, electroslag remelting, forging, perforating, pipe rolling, sizingand annealing heat treatment are carried out to obtain the TWIP steel pipe used in the expansion pipe, and the obtained TWIP steel pipe has the advantages that the carbon content is low; the stable austenite structure is beyond 95%, so that the TRIP effect can be inhibited after expansion deformation; the deformation twin is produced; the mechanical performances are outstanding; and the weldability is high. The whole TWIP smelting and steel pipe manufacturing technology is simple, reliable, and low in cost, and has a good market application prospect.

Description

1. Technical field [0001] The invention relates to the fields of metal materials and oil and gas industries, in particular to a process for smelting TWIP steel for expansion pipes and preparing steel pipes. 2. Background technology [0002] Expandable tube technology is an emerging technology that can optimize wellbore structure, improve drilling safety and significantly reduce drilling cost. This technology can be applied to the whole process of drilling, completion, oil production and workover, and is considered to be one of the core technologies with revolutionary influence in the field of international petroleum engineering in the 21st century. The expansion tube technology is to use hydraulic or mechanical force to push or pull the expansion tool to move axially in the casing, so that the tube body is radially expanded to the required diameter, and permanent plastic deformation is generated for subsequent operations. This technology utilizes the characteristics of meta...

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Problems solved by technology

[0006] After literature search, the invention patent authorized by the State Intellectual Property Office of China with the authorized publication number CN101381839A provides a high-strength plastic alloy steel and its heat treatment process, which can regulate the structure and performance of high-strength plastic TWIP steel. The high content of Si in the steel composition will inhibit the TWIP effect, and will directly affect the surface quality of the steel plate; the invention patent with the authorized publication number of CN102560259A provides a low-cost high expansion rate expansion pipe TWIP steel and a steel pipe preparation method, However, the content of C element in this kind of steel is high, and the plasticity and weldability are poor; the invention patent with the authorized publication number of CN105441796A provides a kind of TWIP steel with high strength plastic product and its preparation method. It is greater than 50GPa%, but the Al element content of this kind of steel is relatively high, which is not conducive to casting and forming; the invention patent with the authorized publication number of CN102345077A provides a kind of steel with high strength and plastic product and a large expansion rate expansion pipe and its preparation method. Steel has the advantages of high purity, low silicon and aluminum content, and avoids defects in hot-rolled billets. However, this type of steel is mixed with Re elements to improve the performance of TWIP steel, which increases the cost of steel, which is not conducive to large-scale production and promotion. application

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