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Hot continuous rolling production method for 530-mm large-diameter seamless steel pipe

A technology for seamless steel pipes and production methods, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as short service life, increased production costs, and excessive pipe diameters, so as to reduce production costs and improve Production efficiency, effect of reducing deformation

Pending Publication Date: 2022-01-11
JIANGSU TIANHUAI STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

530 mm large-diameter steel pipes can only be produced by pipe expansion or welded pipe technology for a long time due to their large diameter and technical limitations, and cannot be directly produced from blanks
However, the pipe expansion process uses secondary thermal expansion, and the finished steel pipe will have internal spiral defects, resulting in uneven wall thickness, and the hourly production capacity can only produce about 6 to 8 pieces; in addition, if the welded pipe process is used to produce 530 mm For large-diameter steel pipes, the grain size and performance of the welded parts are not guaranteed compared with seamless steel pipes, resulting in a short service life
Apply the hot continuous rolling production method for 508 mm large-diameter seamless steel pipes disclosed in the patent application number 201610779369.6 previously applied by the applicant to the hot continuous rolling production of 530 mm large-diameter seamless steel pipes. It is of reference value, but because of the different sizes, it is necessary to configure a new set of rolls, which will greatly increase the production cost. Therefore, from the perspective of production costs, it is necessary to use the original rolls for production as much as possible, which will have to Make creative changes to the above patent scheme

Method used

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  • Hot continuous rolling production method for 530-mm large-diameter seamless steel pipe
  • Hot continuous rolling production method for 530-mm large-diameter seamless steel pipe
  • Hot continuous rolling production method for 530-mm large-diameter seamless steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare a steel pipe with an outer diameter of 530 mm and a thickness of 12 mm, which belongs to the extreme thin-walled pipe (D / S=44.17).

[0048] The steel grade of the billet is No. 20 steel. The temperature of the billet out of the annular heating furnace is 1280 degrees Celsius. The annular heating furnace is divided into 7 sections for heating, which are respectively: 900 degrees Celsius, 1100 degrees Celsius, 1220 degrees Celsius, 1250 degrees Celsius, 1310 degrees Celsius. degrees Celsius, 1290 degrees Celsius and 1280 degrees Celsius; when the billet is pierced, the diameter of the mandrel is 527 mm, and the capillary size after piercing is 606 mm in outer diameter and 27 mm in thickness. figure 1 As shown; the size of the blank tube after continuous rolling is 554 mm in outer diameter, 11.94 mm in thickness, and the elongation coefficient is 9.45; there are 5 racks in total for the tube removal rack and the sizing rack, of which there are 3 racks for the tube r...

Embodiment 2

[0050] Prepare a steel pipe with an outer diameter of 530 mm and a thickness of 24 mm, which is a thin-walled pipe (D / S=22.08).

[0051] The steel grade of the billet is No. 20 steel. The temperature of the billet out of the annular heating furnace is 1270 degrees Celsius. The annular heating furnace is divided into 7 sections for heating, which are respectively: 900 degrees Celsius, 1100 degrees Celsius, 1220 degrees Celsius, 1250 degrees Celsius, 1310 degrees Celsius. degrees Celsius, 1280 degrees Celsius and 1270 degrees Celsius; the size of the perforated capillary tube is 606 mm in outer diameter and 36 mm in thickness. figure 2 As shown; the size of the waste tube after continuous rolling is 554 mm in outer diameter and 23.92 mm in thickness, and there are 5 de-pipe racks in total, of which 3 are de-pipe racks, and the minimum 2B value of the de-pipe rack (pass type Size) is 540 mm, and the finished product size after sizing the frame is 508 mm in outer diameter and 24 ...

Embodiment 3

[0053] Prepare a steel pipe with an outer diameter of 530 mm and a thickness of 36 mm, which belongs to thick-walled pipes (D / S=14.72).

[0054] The steel grade of the billet is No. 20 steel. The temperature of the billet out of the annular heating furnace is 1260 degrees Celsius. The annular heating furnace is divided into 7 sections for heating, which are respectively: 900 degrees Celsius, 1100 degrees Celsius, 1220 degrees Celsius, 1240 degrees Celsius, 1300 degrees Celsius. degrees Celsius, 1270 degrees Celsius and 1260 degrees Celsius; the size of the perforated capillary tube is 606 mm in outer diameter and 47 mm in thickness. image 3 As shown; the size of the waste tube after continuous rolling is 530 mm in outer diameter and 35.92 mm in thickness, and there are 3 racks in total, of which there are 3 racks, and the smallest rack 2B value (pass type Size) is 540 mm, and the finished product size after sizing the frame is 530 mm in outer diameter and 36 mm in thickness. ...

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Abstract

The invention discloses a hot continuous rolling production method for a 530-mm large-diameter seamless steel pipe. The method comprises the following steps that (1) a blank is put into an annular heating furnace to be heated; (2) when the temperature of the blank is heated to be larger than or equal to 1250 DEG C, the blank is taken out and perforated into a hollow billet; (3) the perforated hollow billet is subjected to PQF three-roller continuous rolling through a continuous rolling machine, and a pierced billet with the outer diameter being 544 mm is obtained through continuous rolling; (4) the pierced billet subjected to continuous rolling is subjected to tube removing, diameter reducing and diameter sizing through a tube removing rack; and (5), The steel pipe after diameter sizing is turned over to a cooling bed for cooling. According to the process, the hot continuous rolling production method for the 530-millimeter large-diameter seamless steel pipe achieves one-time continuous rolling production of the 530-millimeter large-diameter seamless steel pipe, about 30 seamless steel pipes can be produced per hour, and the production efficiency is obviously improved.

Description

technical field [0001] The invention relates to the field of production of large-diameter extra-thick-wall seamless steel pipes, in particular to a production method for hot continuous rolling of 530 mm large-diameter seamless steel pipes. Background technique [0002] Large-diameter thick-walled steel pipes have a very wide range of applications, and because of their thicker walls, they can withstand greater pressure. Generally, it can be used as a material for hollow parts, used to withstand pressure and used on important pipelines. Specifically, it can be used as structural pipes for aviation, petroleum geological drilling pipes, pipes for petrochemical industries, etc. When thick-walled steel pipes are used, they must also follow relevant regulations. Therefore, pipes of different specifications must be used for different purposes. This also provides an important prerequisite for the use of thick-walled steel pipes, especially when transportation is more dangerous. Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B23/00B21B37/78B21B45/00
CPCB21B23/00B21B37/78B21B45/00
Inventor 李进荣龙金花李恩学伏仲李伯旺陆超王久营蒋海龙丛文广贾建涛马伟李政冯登辉
Owner JIANGSU TIANHUAI STEEL PIPE
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