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Steel for oil well pipe, preparation method of steel and oil well pipe

A technology for oil well pipes and pipes, which is applied in the field of preparation of oil well pipes and steel for oil well pipes. It can solve the problems that high strength and high toughness, high strength and SSC resistance can not be satisfied at the same time, so as to improve the SSC resistance and increase molybdenum Content, the effect of improving toughness

Pending Publication Date: 2022-04-26
HENGYANG VALIN STEEL TUBE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a steel for oil well pipe, its preparation method and oil well pipe to solve the problem that the steel for oil well pipe in the prior art cannot simultaneously satisfy high strength and high toughness, high strength and SSC resistance

Method used

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  • Steel for oil well pipe, preparation method of steel and oil well pipe
  • Steel for oil well pipe, preparation method of steel and oil well pipe
  • Steel for oil well pipe, preparation method of steel and oil well pipe

Examples

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preparation example Construction

[0052] In another typical embodiment of the present application, a method for preparing the above steel for oil well pipe is provided, the preparation method includes: Step S1, mixing materials according to the chemical composition of the above steel for oil well pipe to obtain raw materials, and smelting the raw materials and pouring to obtain a steel ingot; step S2, heat the steel ingot, then forge it in the austenite single-phase region and cool it to room temperature to obtain a cooled steel ingot; step S3, heat treat the cooled steel ingot to obtain oil well pipe steel.

[0053] According to the chemical composition of the steel for oil well pipes mentioned above, the corresponding process is adopted in the preparation method, so as to obtain the steel for oil well pipes with high strength, high toughness and SSC resistance; at the same time, through the cooling process in the heat treatment process, the metallographic structure is controlled. Composition, thereby reducing...

Embodiment 1

[0096] In terms of weight percentage, the chemical composition of steel is: C 0.45%, Si 0.21%, Mn 0.42%, Cr 0.99%, Mo 0.76%, V 0.11%, Nb 0.01%, Al 0.025%, N 0.018%, S 0.001% , P 0.009%, Cu0.99%, Ni 0.62%, wherein Ni / Cu=0.62; the balance is Fe.

[0097] The preparation method is as follows:

[0098] (1) Mix raw materials according to the above chemical components, and obtain steel ingots through vacuum induction smelting and pouring;

[0099] (2) above-mentioned steel ingot is kept warm at 1160 ℃, and the holding time is 8 hours;

[0100] (3) Forge the steel ingot in the austenite single-phase region: the initial forging temperature is 1100°C, the initial forging time is 20min, the final forging temperature is 980°C, the final forging time is 15min, the forging ratio is 10, and air-cooled to room temperature after forging , the cooling rate is 5°C / s.

[0101] (4) Cut a cylindrical steel sample with a diameter of 20mm and a thickness of 20mm for heat treatment: first, the ste...

Embodiment 2

[0103] Different from Example 1, the tempering temperature in step (4) is 710° C., the tempering coefficient is 6.0, and the tempering time is 120 minutes.

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Abstract

The invention provides steel for an oil well pipe, a preparation method of the steel and the oil well pipe. The steel for the oil well pipe comprises the following chemical components in percentage by weight: 0.4-0.6% of C, less than or equal to 0.3% of Si, less than or equal to 0.5% of Mn, 0.8-1.2% of Cr, 0.6-0.9% of Mo, 0.1-0.3% of V, less than or equal to 0.05% of Nb, less than or equal to 0.05% of Al, less than or equal to 0.03% of N, less than or equal to 0.005% of S, less than or equal to 0.01% of P, 0.7-1.5% of Cu, and the balance of iron and inevitable impurities, wherein the weight percentage of Ni / Cu is more than or equal to 0.5 and less than or equal to 1. By balancing the chemical components of the steel for the oil well pipe, the double contradictory relationship between high strength and high toughness and between high strength and SSC resistance is solved.

Description

technical field [0001] The invention relates to the technical field of pipeline steel for oil and natural gas development, in particular to a steel for oil well pipe, its preparation method and oil well pipe. Background technique [0002] In the field of oil and natural gas production, along with the depletion of low-corrosivity shallow well oil and gas resources, the development of highly corrosive high-pressure deep wells has been increasing. The deepening of oil and gas wells, on the one hand, requires oil well steel pipes to have high strength and high toughness; on the other hand, most oil and gas wells contain corrosive hydrogen sulfide (H 2 S), so the requirements for corrosion resistance of steel pipes are also increased. [0003] Low alloy steel pipes exposed to H 2 In the acidic environment of S, hydrogen brittle fractures originating from sulfide stress cracking (SSC) will occur, and the higher the strength of the steel, the easier it is for SSC to occur. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C22C38/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/06C22C38/001C22C38/42C21D9/08C21D2211/001C21D2211/00Y02P10/20
Inventor 邹喜洋严伟吴光辉史显波周正平单以银朱林曾天翼郑秋艳
Owner HENGYANG VALIN STEEL TUBE
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