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 problems such as brittle cracking and unstable performance, and achieve the effect of avoiding pipe bending and saving energy.

Inactive Publication Date: 2012-10-03
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 casi

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] Embodiment 1: A production process of PSL-2 grade non-quenched and tempered N80 steel grade oil casing (diameter 177.8mm×wall thickness 9.19mm), adopts the following process steps:

[0022] (1) Ring furnace heating: heat the tube billet in a ring furnace at 1280°C for 3.5 hours;

[0023] (2) Piercing: Pierce the heated tube blank on the piercing machine, and roll to obtain the capillary of the required specification. The capillary temperature is 1150°C;

[0024] (3) Continuous rolling and stripping: the capillary tube obtained after piercing is rolled to the required specification on the stop mandrel continuous rolling mill, and the final rolling temperature of continuous rolling is 1000°C; Separate the empty tube from the mandrel;

[0025] (4) Sizing: pass the waste pipe obtained by continuous rolling and stripping through the sizing machine to obtain the required outer diameter. The inlet temperature of the sizing machine is 880°C, and the temperature of the waste pi...

Embodiment 2

[0028] Embodiment 2: A production process of PSL-2 grade non-quenched and tempered N80 steel grade oil casing (diameter 177.8mm×wall thickness 9.19mm), the following process steps are adopted:

[0029] (1) Ring furnace heating: heat the tube billet in a ring furnace at 1200°C for 3 hours;

[0030] (2) Piercing: Pierce the heated tube blank on the piercing machine, and roll to obtain the capillary of the required specification. The capillary temperature is 1160°C;

[0031] (3) Continuous rolling and stripping: the capillary tube obtained after piercing is rolled to the required specification on the stop mandrel continuous rolling mill, and the final rolling temperature of continuous rolling is 1010°C; the capillary tube after continuous rolling is rolled on the stripping machine Separate the empty tube from the mandrel;

[0032] (4) Sizing: pass the waste pipe obtained by continuous rolling and stripping through the sizing machine to obtain the required outer diameter. The inl...

Embodiment 3

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

[0036] (1) Ring furnace heating: heat the tube billet in a ring furnace at 1250°C for 3.2 hours;

[0037] (2) Piercing: Pierce the heated tube blank on the piercing machine, and roll to obtain the capillary of the required specification. The capillary temperature is 1170°C;

[0038] (3) Continuous rolling and stripping: Roll the capillary tube obtained after piercing to the required specifications on the stop mandrel continuous rolling mill. The final rolling temperature of continuous rolling is 1020°C; Separate the empty tube from the mandrel;

[0039] (4) Sizing: pass the waste pipe obtained by continuous rolling and stripping through the sizing machine to obtain the required outer diameter. The inlet temperature of the sizing machine is 900°C, and the temperature of the waste pipe ...

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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 production process of PSL-2 grade non-quenched and tempered N80 steel grade oil casing pipe, especially a production method for producing PSL-2 grade oil casing pipe by controlling rolling and cooling process of low alloy steel, belonging to field of metallurgical technology. 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 on-line normalization for production, and the cost is almost the same as that of the commonly used rolling, quenching and tempering process route. 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. [0003] The API standard is the standard of the American Petroleum Institute, whic...

Claims

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Application Information

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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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