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508 mm large-diameter seamless steel pipe hot rolling production method

A technology of seamless steel pipe and production method, which is applied in metal rolling, metal rolling, driving device for metal rolling mill, etc. The problem of uneven thickness, to achieve the effect of good internal and external surface quality, high service life and guaranteed performance

Active Publication Date: 2018-03-27
JIANGSU TIANHUAI STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

508 large-diameter steel pipes can only be produced by expanding pipes or welded pipes for a long period of time due to their large pipe diameters and technical limitations, and cannot be produced directly from blanks.
However, if the pipe expansion process adopts secondary thermal expansion, the finished steel pipe will have internal spiral defects, resulting in uneven wall thickness, and only about 10 pieces can be produced per hour; in addition, if the welded pipe process is used to produce 508 large-diameter steel pipes, the The grain size and performance of welded parts are not guaranteed compared to seamless steel pipes, resulting in a very short service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A steel pipe with an outer diameter of 508 mm and a thickness of 9.5 mm was prepared, which belongs to the limit thin-walled pipe (D / S=53.47).

[0038] The steel grade of the billet is No. 20 steel. The temperature of the billet out of the annular heating furnace is 1290 degrees Celsius. The annular heating furnace is divided into 7 stages for heating, which are respectively: 900 degrees Celsius, 1100 degrees Celsius, 1220 degrees Celsius, 1240 degrees Celsius, 1310 degrees Celsius. degrees Celsius, 1290 degrees Celsius and 1290 degrees Celsius; when the blank is pierced, the diameter of the mandrel is 507.2 mm, and the size of the capillary after piercing is 577 mm in outer diameter and 25.9 mm in thickness. As shown in 1; the size of the blank tube after continuous rolling is 530 mm in outer diameter, 9.4 mm in thickness, and the elongation coefficient is 4.36; there are 5 racks in total for the tube removal frame and the sizing frame, of which there are 3 frames for t...

Embodiment 2

[0042] Prepare a steel pipe with an outer diameter of 508 mm and a thickness of 15 mm, which is a thin-walled pipe (D / S=33.87).

[0043] 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 stages of heating, which are respectively: 900 degrees Celsius, 1100 degrees Celsius, 1220 degrees Celsius, 1240 degrees Celsius, 1310 degrees Celsius. degrees Celsius, 1280 degrees Celsius and 1280 degrees Celsius; the size of the capillary tube after perforation is 577 millimeters in outer diameter and 28.55 millimeters in thickness, and the continuous rolling mill carries out continuous rolling in 5 stages, and the rolling parameters are as shown in Table 1; the blank pipe size after continuous rolling is The outer diameter is 530 mm, the thickness is 14.84 mm, and there are 5 detachment racks and sizing racks in total, of which 3 detachment racks and 2 sizing ...

Embodiment 3

[0045] Prepare a steel pipe with an outer diameter of 508 mm and a thickness of 30 mm, which belongs to thick-walled pipes (D / S=16.98).

[0046] 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 temperature in 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 1270 degrees Celsius; the size of the capillary tube after perforation is 577 millimeters in outer diameter and 41.55 millimeters in thickness, and the continuous rolling mill continuously carries out 5 stages of rolling, and the rolling parameters are as shown in Table 1; the blank pipe size after continuous rolling is The outer diameter is 530 mm, the thickness is 29.3 mm, and there are 4 racks for removing tubes and sizing racks in total, 2 ...

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Abstract

The invention discloses a 508-mm large-caliber seamless steel tube hot-continuous-rolling production method which comprises the following steps: (1) putting a blank in an annular heating furnace for heating; (2) when the blank is heated to 1250 DEG C or above, taking out the heated blank and carrying out perforation to obtain a tubular billet; (3) passing the tubular billet obtained from the perforation through a continuous rolling machine for PQF three-roll continuous rolling; (4) removing a pierced billet obtained from the continuous rolling, and then carrying out tube reducing and sizing on the outer diameter of the pierced billet through a sizing mill stand; and (5) turning a steel tube obtained from the sizing over to a cooling bed for cooling. According to the above structure, one-time continuous-rolling production of the 508-mm large-caliber seamless steel tube can be achieved by adopting the 508-mm large-caliber seamless steel tube hot-continuous-rolling production method, and 20 to 30 508-mm large-caliber seamless steel tubes can be produced per hour. Accordingly, the production efficiency is obviously improved.

Description

technical field [0001] The invention relates to the field of producing 508 mm large-diameter seamless steel pipes, in particular to a production method for hot continuous rolling of 508 mm large-diameter seamless steel pipes. Background technique [0002] With the development of the petroleum industry, the pipe quality requirements for petroleum and natural gas pipelines are getting higher and higher. Due to its large diameter and technical limitations, 508 large-diameter steel pipes can only be produced by pipe expansion or welded pipe technology for a long time, and cannot be directly produced from blanks. However, if the pipe expansion process adopts secondary thermal expansion, the finished steel pipe will have internal spiral defects, resulting in uneven wall thickness, and only about 10 pieces can be produced per hour; in addition, if the welded pipe process is used to produce 508 large-diameter steel pipes, the The grain size and performance of welded parts are not g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B19/04B21B19/10B21B37/74B21B37/46
CPCB21B19/04B21B19/10B21B37/46B21B37/74B21B2261/20B21B2275/04
Inventor 曾晓东卢立锋陆超栗红民龙金花宋永琛陶侃侃夏兆春惠成
Owner JIANGSU TIANHUAI STEEL PIPE
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