Method for preventing bending deformation of hot-rolled cr-mo alloy steel pipe cooling bed

A bending deformation and alloy steel technology, applied in the field of hot-rolled steel pipe cooling, can solve the problems of bending deformation of the steel pipe body, uneven temperature drop of the pipe, and obstruction of online production, so as to reduce the bending deformation and ensure the uniformity of the temperature drop of the pipe. , the effect of reducing the effect of temperature difference

Active Publication Date: 2017-06-20
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this method can only be applied to special-shaped steel products. Usually, the length of special-shaped steel products will not exceed 20m, that is, this method cannot solve the problem of bending and deformation of the steel pipe body due to the uneven temperature drop of the pipe body during the cooling process of the cooling bed. question
[0007] To sum up, the existing hot-rolled Cr-Mo alloy steel pipe after hot rolling and sizing, when cooling in the cooling bed, due to the poor temperature uniformity of the pipe body, the temperature drop of the pipe body is not uniform when cooling. , there will be bending and deformation of the steel pipe body, which will hinder the online production, and there will be a greater safety risk in the production of the bent steel pipe, and at the same time, the bent and deformed steel pipe will not be easy to process in the subsequent production.

Method used

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  • Method for preventing bending deformation of hot-rolled cr-mo alloy steel pipe cooling bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Produce 30CrMo finished tubes with an outer diameter of 88mm and a length of 12m. The length of the head end and tail end of the smooth tube to be cut off later is 1.1m. The length of the hot-rolled barren tube is 14.2m. The tubes were ignited in 20 bypass burners in the reheating furnace, and after 31 minutes of heat treatment, the furnace temperature in the soaking section of the reheating furnace was raised to 800°C and kept at a constant temperature. After the capillary tube is hot-rolled into a waste tube, the waste tube enters the reheating furnace through the bypass roller table, and the waste tube is subjected to soaking treatment at a constant temperature for 0.5 minutes; the soaked tube is descaled with high-pressure descaling water. , the 1.1m head end and the 1.1m tail end of the waste pipe are not descaled; when the descaled waste pipe is tensioned and reduced on the stretching and reducing machine, the cooling of the empty rack that does not participate in ...

Embodiment 2

[0050]Produce 30CrMo finished pipes with an outer diameter of 100mm and a length of 15m. The length of the head end and tail end of the bare pipe to be cut off later is 2m. The length of the hot-rolled blank pipe is 19m. The hot-rolled blank pipe is 28 bypass burners were ignited in the reheating furnace, and after 45 minutes of heat treatment, the furnace temperature in the soaking section of the reheating furnace was raised to 1000°C and kept at a constant temperature. After the capillary tube is hot-rolled into a waste tube, the waste tube enters the reheating furnace through the bypass roller table, and the waste tube is subjected to soaking treatment at a constant temperature for 1.0 minutes; , the head end 2m part and the tail end 2m part of the waste pipe are not descaled; when the descaled waste pipe is tensioned and reduced on the stretching and reducing machine, the cooling water that does not participate in the metal rolling and passes through the stand is closed; A...

Embodiment 3

[0054] Produce 30CrMo finished tubes with an outer diameter of 139.7mm and a length of 12.7m. 25 bypass burners were ignited in the reheating furnace, and after 38 minutes of heat treatment, the furnace temperature in the soaking section of the reheating furnace was raised to 910°C and kept at a constant temperature. After the capillary tube is hot-rolled into a waste tube, the waste tube enters the reheating furnace through the bypass roller table, and the waste tube is subjected to soaking treatment at a constant temperature for 0.8 minutes; the soaked tube is descaled with high-pressure descaling water. , the 1.5m head end and the 1.5m tail end of the barren pipe are not descaled; an insertion frame with rolls is installed after the tensioning and reducing machine rolling frame, and the insertion frame is used as a guide frame, and the barren after descaling treatment When the tube is calibrated by the stretching and reducing machine to make a bare tube for output, the cool...

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Abstract

The invention discloses a method for preventing bending and deformation of a hot-rolled Cr-Mo alloy steel pipe cooling bed. The method comprises the following four steps of heat equalizing treatment of a pierced billet, descaling control before tension and diameter reducing, process control of tension and diameter reducing, and control of pipe distributing of a polished pipe cooling bed. The method has the advantages that the internal stress of a polished pipe is greatly reduced before the cooling on the cooling bed; during cooling on the cooling bed, the internal stress caused by nonuniform temperature lowering of the polished pipe due to the temperature difference of the polished pipe before and after cooling is greatly reduced, the possibility of bending and deformation of the pipe in the cooling process of the hot-rolled Cr-Mo alloy steel pipe is further reduced, and the finished rate of cooling treatment of the hot-rolled Cr-Mo alloy steel pipe is improved.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel pipe cooling, in particular to a method for preventing bending deformation of a hot-rolled Cr-Mo alloy steel pipe cooling bed. Background technique [0002] Seamless steel pipe is a commonly used fluid conveying pipe. Compared with solid round steel, when the bending and torsional strength is the same, its manufacturing material is less, its weight is lighter, and it is easy to process and shape. It is widely used in the manufacture of structural parts and mechanical parts. There are three main manufacturing methods of seamless steel pipes: hot rolling, cold rolling, and cold drawing. Among them, hot rolling is currently the most used seamless steel pipe production method. [0003] Hot rolling refers to rolling a steel ingot or billet with a large amount of deformation at a relatively high temperature. Taking the rolling of steel plates as an example, the thickness of the continuous cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74
CPCB21B37/74
Inventor 李银李栋夏洪斌陈江林肖迎春
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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