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Heating method of seamless steel pipe

A heating method and seamless steel pipe technology, which is applied in the field of metal pressure processing, can solve the problem of uneven carbides in blanks, and achieve the effects of refining grain size, reducing heating, and eliminating low performance indicators

Inactive Publication Date: 2018-05-25
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a heating method for seamless steel pipes, which can eliminate the problem of uneven carbides in the billet, refine the grain size, and prevent the grain from growing

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  • Heating method of seamless steel pipe
  • Heating method of seamless steel pipe
  • Heating method of seamless steel pipe

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following describes the technical solutions of the present invention clearly and completely in conjunction with preferred embodiments of the present invention. Based on the embodiments of the present application, those of ordinary skill in the art Other similar embodiments obtained without creative work shall fall within the protection scope of this application.

[0027] In the present invention, the annular heating furnace for heating seamless steel pipes has seven zones in total, using three-stage heating (preheating section, heating section, soaking section), and each section of the annular heating furnace adopts the best heating temperature and heating time. , Heating speed, pressure system, atmosphere system.

[0028] Such as figure 1 Shown is a schematic diagram of the zones of the ring heating furnace in the present invention.

[0029] The annular heat...

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Abstract

The invention discloses a heating method of a seamless steel tube. The heating method comprises the temperature schedule, the heating time, the pressure schedule and the atmosphere schedule of an annular heating furnace. According to the heating method, a uniform austenite structure can be formed, oxidation burning losses can be reduced, and the defect that the performance indexes such as yield strength and impact strength are low is fully eliminated.

Description

Technical field [0001] The invention relates to a metal pressure processing technology, in particular to a method for heating seamless steel pipes. Background technique [0002] The billet needs to be heated to a suitable rolling temperature in a circular heating furnace before rolling, and then rolled into a tube. The technical requirements for structural tubes are high yield strength, high impact toughness, and strict requirements on the uniformity of chemical composition and carbide in the blank. The structure of the structural tube at room temperature is ferrite + cementite, and the heating process of the blank is actually the process of carbide diffusion and dissolution and austenite homogenization. The heating method of the blank plays a vital role in improving the performance of the product. If the heating process is unreasonable and uniform austenite cannot be formed, the yield strength, impact toughness and other performance indicators will not meet the standard requir...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D1/74B21B37/74
CPCB21B37/74C21D1/74C21D9/08C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/32
Inventor 蔺俐枝杨世龙吴明宏倪鑫赵强郭利中房旭马俊强马新宇
Owner INNER MONGOLIA BAOTOU STEEL UNION
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