Method for improving transverse impact toughness of seamless steel tube

A technology of seamless steel pipe and transverse impact, which is applied to furnace types, furnaces, heat treatment furnaces, etc., and can solve problems such as collapse, scrapping, and production reduction of the entire well

Inactive Publication Date: 2010-12-15
TIANJIN PIPE GROUP CORP +1
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Problems solved by technology

Such drilling and production conditions have very strict requirements on the strength and toughness of the oil casing. Once the oil casing is...

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  • Method for improving transverse impact toughness of seamless steel tube
  • Method for improving transverse impact toughness of seamless steel tube
  • Method for improving transverse impact toughness of seamless steel tube

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Embodiment Construction

[0039] The method for improving the transverse impact toughness of seamless steel pipes of the present invention will be described with reference to the accompanying drawings and examples.

[0040] The method for improving the transverse impact toughness of seamless steel pipes of the present invention is applicable to seamless steel pipes for oil casings, oil pipes, drill pipes, screw drilling tools, and gas cylinder pipes that have high requirements for transverse impact energy and withstand high pressure. The weight ratio of the constituent elements of the seamless steel pipe is C: 0.22-0.50%, Si: ≤0.50%, Mn: 0.60-1.90%, Cr: ≤1.50%, Mo: ≤1.10%, Al: 0.015-0.060%, Ni <1.00%, V: <0.15%, P≤0.015%, S≤0.005%, O≤0.004%, N≤0.013%, H≤0.0004%, and the rest is iron; the method includes the following steps:

[0041] ① Tube billet smelting and continuous casting:

[0042] Oil casing materials that meet API SPEC 5CT standards are smelted and refined, and then continuously cast into contin...

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Abstract

The invention provides a method for improving transverse impact toughness of a seamless steel tube, which comprises the following steps: smelting and continuously casting a tube blank; perforating and carrying out tandem rolling on the steel tube; and carrying out heat treating, so that the mechanical properties of a petroleum casing tube achieve the following requirements: the yield strength and tensile strength meet the standard requirements of API SPEC 5CT, the impact toughness meets the standard requirements of API SPEC 5CT, and simultaneously the ratio of the transverse full-size Charpy impact work to the longitudinal full-size Charpy impact work is controlled at 0.75-0.90. The invention has the effects that when the rolling ratio of the method is controlled at 12.8%-26%, the ratio of the transverse full-size Charpy impact work to the longitudinal full-size Charpy impact work of the steel tube is controlled at 0.75-0.90, and when the rolling ratio of the steel tube production is reduced to 15.9%, the ratio of the transverse impact to the longitudinal impact is increased to 0.89, and the transverse impact work is increased to 55J.

Description

technical field [0001] The invention belongs to the manufacturing technology of seamless steel pipes used in the oil and gas industry in the metal material industry, and relates to a method for improving the transverse impact toughness of seamless steel pipes. Background technique [0002] Due to the severe situation of global oil supply, the exploitation of deep oil and gas resources and offshore oil fields have made the use environment and load of the casing more and more severe, which puts forward higher requirements for the strength and toughness of the casing. However, high-strength casing generally has the problem of low lateral toughness, which cannot meet the needs of oilfield development in deep layers and oilfields with complex geological conditions. The exploration and construction of ultra-deep oil and gas wells has become a major basic project related to the long-term stable and sustainable development of the oil and gas industry. Ultra-high-strength and high-t...

Claims

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Application Information

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IPC IPC(8): C21D8/10C21D9/08C22C38/04C22C33/04B21B23/00
Inventor 张传友江勇周家祥严泽生孙开明王明智王青峰刘江成史庆志李效华周晓峰甑晓川
Owner TIANJIN PIPE GROUP CORP
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