Grooving corrosion resistant high strength steel for ERW soldering sleeve, sleeve and production method

Abstract

The invention provides a steel used for a guttering corrosion resistant high-strength ERW welding socket, and the chemical compositions of which by weight percentage are as follows: 0.15 percent to 0.25 percent of C, 0.05 percent to 0.4 percent of Si, 0.7 percent to 1.5 percent of Mn, less than or equal to 0.1 percent of P, less than 0.005 percent of S, 0.005 percent to 0.03 percent of Ti, 0.005 percent to 0.04 percent of Nb, 0.005 percent to 0.04 percent of V, 0.1 percent to 0.7 percent of Cr, 0.1 percent to 0.30 percent of Cu, 0 percent to 0.003 percent of B, 0.002 percent to 0.04 percent of Al and 0.001 to 0.01 percent of Ca, and the rest are Fe and other unavoidable impurities. The invention also provides a cannula prepared by adopting the steel and a manufacturing method thereof. Thesteel of the invention has excellent performance of guttering corrosion resistance and does not contain expensive alloying elements such as Mo and Ni and the like, therefore, the cost of the cannula is low.

Description

technical field [0001] The invention relates to a steel for groove corrosion-resistant high-strength resistance welding (ERW) welding casing, a groove-resistant high-strength resistance welding (ERW) welding casing and a production method thereof. Background technique [0002] Oil and gas development casings are generally produced and supplied according to the API (American Petroleum Institute) standard organization. According to the API standard, there are two types of oil casing pipes, seamless pipes and welded pipes. Compared with seamless pipes, welded pipes have remarkable features such as high production efficiency, good dimensional accuracy, wide specification range, and low cost. Therefore, they are the first choice of manufacturers and oilfield users, and have always been favored by the market. N80 steel grade casing is a high-strength steel pipe, according to the API standard, its yield strength R 0.5 Must be between 552~758MPa, tensile strength R m Must be grea...

AI Technical Summary

Problems solved by technology

As shown in Table 1, patents JP54097522A and JP61124552A disclose a production method for groove corrosion-resistant welded steel pipes. The alloy used is an ultra-low carbon ferrite structure. Due to the low hardness of the steel pipe, the anti-sticking performance is very poor. Not suitable for the production of oil casing; the alloy components used in patents JP54097524A, JP56123349A and JP57104648A do not contain Ti, Nb, V, Cr, Cu or only a small amount of strengthening elements such as Nb, and the strength of the steel pipe is low, so it is impossible to produce high-grade steel Requirements for welding casing; the patent JP56035749A does not contain the above elements, although the requirement of high strength can be achieved, and Si is as high as 1%, and gray spots are easy to form at the weld during welding, which seriously affects the quality of the weld, and the carbon equivalent is as high as 0.8, which cannot Realize the requirements of shear butt welding; the patents JP09029460A, JP54097523A, JP56069354A and JP59047364A with Cu added respectively use P, Ti, Nb or V as strengthening elements, and it is also possible to achieve the requirements of producing high-strength casing by controlling cooling (such as patent All the embodiments of JP56069354A only reach 70 steel grades), but because they do not contain Cr, it is impossible to have good resistance to trench corrosion while achieving high strength; and patents JP57131346A, JP58093855A and JP59096244A all contain expensive Ni elements , the cost of the alloy is high, and the Si content of JP57131346A and JP58093855A is high, so it is difficult to obtain excellent weld performance; Alloy elements such as Cr and Cu for trench corrosion, and there is no limit to the content of S, one of the key elements affecting trench corrosion performance, and it does not have the ability to resist trench corrosion

In addition, the Japanese products listed in Table 1 not only do not have the ability to resist trench corrosion, but also contain expensive Mo elements, and the cost of the produced casing is too high

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