130ksi steel-grade low-temperature drill rod with high toughness and corrosion resistance and manufacturing method thereof

Abstract

The invention provides a 130ksi steel-grade low-temperature drill rod with high toughness and corrosion resistance, comprising the following components in weight by percentage: 0.20%-0.30% of C, 0.15%-0.40% of Si, 0.25%-0.85% of Mn, 0.45%-1.25% of Cr, 0.25%-0.85% of Mo, 0.35%-0.85% of Ni, 0.03%-0.10% of V, 0.01%-0.06% of Nb, 0.008%-0.050% of Al, 0.0015%-0.0050% of Ca and the balance of ferrum and a trace of impurity elements. Meanwhile, the invention provides a manufacturing method of the 130ksi steel-grade low-temperature drill rod with high toughness and H2S corrosion resistance. The drill rod has the advantages that by adopting reasonable raw material components, the drill rod ensures impact toughness, favorable H2S corrosion-resistant capacity and material strength; the purity of steel is improved in a steel making process; in a rolling process, the production rhythm is improved, and the quality of the inner surface and the outer surface and the size precision of a steel tube are improved; the impact toughness and the corrosion-resistant capacity of the steel are improved by thermal treatment, and the toughness of the steel tube is improved, which is important for improving the corrosion resistance of the steel tube.

Description

technical field [0001] The invention relates to a 130ksi steel-grade drill pipe, in particular to a 130ksi steel-grade low-temperature, high-toughness, corrosion-resistant drill pipe and a manufacturing method thereof. Background technique [0002] Due to the continuous development of the world economy, human beings have an increasing demand for oil and natural gas, and the price of crude oil continues to rise, making oil companies gradually expand their oil production to extreme areas of the earth, such as high altitudes, severe cold, polar regions, high H 2 S corroded area develops. In order to develop oil and gas resources in these places, correspondingly more stringent requirements are put forward for special oil pipes such as oil pipes, casings, and drill pipes. It is required that the drill pipe not only has a high yield strength, but also has good low temperature impact toughness and good resistance to H 2 S ability to corrode. [0003] Drill pipe is the main opera...

AI Technical Summary

Problems solved by technology

In order to obtain a higher yield strength, the tempering temperature in the quenching and tempering process must be reduced, and the impact toughness will be affected at this time; on the contrary, if you want to improve the impact toughness of the steel, you must temper at a higher temperature. At this time, the yield strength of the material is greatly reduced

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