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Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes

A PSL-2, production process technology, applied in the field of high-grade oil casing, can solve the problems of brittle cracks, unstable performance, etc., and achieve the effect of avoiding bending of the pipe body and saving energy

Inactive Publication Date: 2014-01-22
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even some improved direct rolling (without online normalization) methods can only produce PSL-1 grade N80-1 oil and casing specified in API standards, and the performance is unstable; it is prone to brittle cracks during use, etc. ACCIDENT

Method used

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  • Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes
  • Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes
  • Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: A PSL-2 grade non-quenched and tempered N80 steel grade tubing and casing (diameter 177.8mm×wall thickness 9.19mm) production process, using the following process steps:

[0022] (1) Ring furnace heating: heat the tube blank in a ring furnace at 1280℃ for 3.5h;

[0023] (2) Piercing: The heated tube is pierced on a piercing machine and rolled to obtain a capillary of the required specifications, and the capillary temperature is 1150℃;

[0024] (3) Continuous rolling and tube stripping: the capillary tube obtained after piercing is rolled to the required specification on the constrained mandrel continuous rolling mill, the final rolling temperature of continuous rolling is 1000℃; the capillary tube after continuous rolling is placed on the tube stripping machine Separate the waste pipe from the core rod;

[0025] (4) Sizing: The waste pipe obtained by stripping the continuous rolling is passed through a sizing machine to obtain the required outer diameter. The inlet t...

Embodiment 2

[0028] Example 2: A PSL-2 grade non-quenched and tempered N80 steel grade tubing and casing (diameter 177.8mm×wall thickness 9.19mm) production process, using the following process steps:

[0029] (1) Ring furnace heating: heat the tube blank in a 1200℃ ring furnace for 3 hours;

[0030] (2) Piercing: The heated tube blank is pierced on a piercing machine and rolled to obtain a capillary of the required specifications, and the capillary temperature is 1160℃;

[0031] (3) Continuous rolling and tube stripping: the capillary tube obtained after piercing is rolled to the required specification on the constrained mandrel continuous rolling mill, the final rolling temperature of continuous rolling is 1010℃; the capillary tube after continuous rolling is placed on the tube stripping machine Separate the waste pipe from the core rod;

[0032] (4) Sizing: The waste pipe obtained by stripping the continuous rolling is passed through a sizing machine to obtain the required outer diameter. The i...

Embodiment 3

[0035] Example 3: A PSL-2 grade non-quenched and tempered N80 steel grade tubing and casing (diameter 177.8mm×wall thickness 9.19mm) production process, using the following process steps:

[0036] (1) Ring furnace heating: heat the tube blank in a 1250℃ ring furnace for 3.2h;

[0037] (2) Piercing: The heated tube blank is pierced on a piercing machine and rolled to obtain a capillary of the required specification, and the capillary temperature is 1170℃;

[0038] (3) Continuous rolling and tube stripping: the capillary tube obtained after piercing is rolled to the required specification on the constrained mandrel continuous rolling mill, and the final rolling temperature of continuous rolling is 1020℃; the capillary tube after continuous rolling is placed on the tube stripping machine Separate the waste pipe from the core rod;

[0039] (4) Sizing: The waste pipe obtained by stripping the continuous rolling is passed through a sizing machine to obtain the required outer diameter. The i...

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Abstract

The invention relates to a production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes, comprising the following processing steps: step (1) of heating pipe blanks in an annular furnace at 1200-1280 degrees centigrade for 3-3.5 h; step (2) of punching the heated pipe blanks with a puncher, and rolling to obtain coarse pipes with required specification, wherein temperature of coarse pipes is not less than 1150 degrees centigrade; step (3) of rolling coarse pipes obtained by punching on a retained mandrel pipe mill until required specification is obtained, wherein final rolling temperature for continuous rolling is not less than 1000 degrees centigrade; and putting rolled coarse pipes on an extracting mill to separate pierced pipes from core rods; step (4) of processing pierced pipes obtained by rolling and detaching with a sizing mill to obtain required outside diameter, wherein inlet temperature of the sizing mill is not less than 880 degrees centigrade, temperature of pierced pipes after sizing is not less than 820 degrees centigrade, and an equivalent dependent variable in a sizing process is not less than 0.4; step (5) of cooling sized pierced pipes in air at 820-800 degrees centigrade for 10-15 s, then atomizing and cooling at 650-800 degrees centigrade, and cooling to room temperature in the air at the last. The process provided by the invention meets demand of API standard PSL-2 grade on impact properties, and prevents pipes bending, deforming and cracking in a re-tempering process.

Description

Technical field [0001] The invention relates to a PSL-2 grade non-quenched and tempered N80 steel grade tubing and casing production process, in particular to a production method for producing PSL-2 grade tubing and casing pipes by using a low-alloy steel controlled rolling and cooling process. Metallurgical technology field. Background technique [0002] At present, the production of N80-1 steel grade tubing and casing at home and abroad mostly adopts multi-component non-quenched and tempered steel rolling and online normalization for production, and the cost is almost the same as that of the usual rolling and quenching and tempering process routes. Even some improved direct rolling (without on-line normalization) methods can only produce N80-1 tubing and casing pipes of PSL-1 grade specified by the API standard, and the performance is unstable; it is prone to embrittlement during use. accident. [0003] The API standard is a standard of the American Petroleum Institute. The sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/46C22C38/38C22C38/24C22C38/16B21B19/04B21B19/06B21B19/10B21B37/78B21B37/74
Inventor 黄飞
Owner WUXI SEAMLESS OIL PIPE
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