Technique of controlling and cooling hot-rolled seamless tube online
A seamless steel pipe and controlled cooling technology, which is applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve problems such as hot-rolled seamless steel pipes that have not been found, and achieve easier control of cooling effect, simplified process, and better cooling effect Effect
Active Publication Date: 2008-04-09
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology
[0004] Due to the characteristics of the cross-sectional shape of hot-rolled seamless steel pipes, so far, no reports on online controlled cooling of hot-rolled seamless steel pipes have been found at home and abroad.
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[0036] In the early stage of hot test, the batch hot test was mainly based on equipment adaptability adjustment. Three specifications of ∮140×13mm, ∮168×16mm, and ∮180×22mm were tested successively. The steel types were 20# and 45#, and the cooling device was controlled. Choose to use mist cooling.
[0037] It can be seen from the record curve that the final rolling temperature after sizing is generally in the range of 950°C to 980°C, the temperature after controlled cooling is generally 680°C to 780°C according to the wall thickness of the pipe diameter, and the temperature drop is generally in the range of 950°C to 980°C. Between 200°C and 270°C. The temperature drop value varies with the wall thickness of the steel pipe. The thinner the pipe wall, the greater the temperature drop value, and the maximum value is around 270°C; the thicker the pipe wall, the slower the temperature drop value, and the minimum value is around 200°C.
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The invention provides a method for the on line controlled cooling process of a hot rolling seamless steel pipe, the method is realized by a controlled cooling system, and the method comprises the steps that a blower fan and a water pump are started up; the controlled cooling device starts working; the rolled temperature of the seamless steel pipe which is rolled by a three-roller slight tension sizing mill is between 950 DEG C and 980 DEG C, when the tail of the seamless steel pipe is not completely rolled out from the end of the mill housing of the sizing mill, the rotation of the seamless steel pipe can not happen; when the tail of the seamless steel pipe completely breaks away from the end of the mill housing, and is detected by a thermometal detector, meanwhile a changeable angle roller way declines on the horizontal plane according to a set angle, to lead the seamless steel pipe to go forward in spiral way along the rolling direction by the own axis till the whole seamless steel pipe passes through completely; the cooling speed of the process requirement can be achieved finally; subsequently the seamless steel pipe enters into a chain-type cooling bed to implement the air cooling to the room temperature. The invention has the advantages that the controlled cooling process controls the cooling speed of the hot rolling seamless steel pipe after the rolling through the air-mist cooling, to meet the purpose of improving the metallographic structure and the comprehensive mechanical property of the seamless steel pipe.
Description
technical field [0001] The invention relates to a process method of controlled cooling in the production of steel pipes, in particular to a process method of on-line controlled cooling of hot-rolled seamless steel pipes. Background technique [0002] At present, in the production of plates and rods and wires in the metallurgical industry, the process of controlling cooling is very important. Due to the different cross-sectional shapes of materials, the cooling methods used are also different. For example, hot-rolled wide-band steel (hot coil plate) adopts high-pressure water laminar flow cooling method; rod and wire rods use turbulent-flow tube cooling system for controlled cooling after rolling. [0003] The common point of the above control cooling methods is to use high-pressure water to control the cooling rate of steel to improve the comprehensive mechanical properties of steel. [0004] Due to the characteristics of the cross-sectional shape of the hot-rolled seamless...
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IPC IPC(8): B21B37/74B21B37/78
Inventor 庄刚钟锡弟伍家强刘智勇李群宁玫袁文寛陈洪琪李培达顾敬一杨富华魏东辉朱人君王亮刘沛张玺源赵凤端肖兴王惠斌邱莉
Owner TIANJIN STEEL PIPE MFG CO LTD
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