Method for manufacturing wear resistant slurry conveying longitudinal welded pipe
A straight seam welded pipe and wear-resistant technology, which is used in the preparation of high-frequency straight seam welded pipes for slurry conveying and the preparation of straight seam welded pipes for slurry transportation, can solve the problems of poor erosion and wear resistance of weld seams, and achieve The effect of improving erosion resistance and improving comprehensive mechanical properties
Inactive Publication Date: 2014-07-16
武汉钢铁有限公司
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[0010] The invention aims at the deficiency of the poor erosion and wear resistance of the weld seam in the prior art, and provides a preparation method of a wear-resistant slurry conveying straight seam welded pipe whose erosion and wear resistance of the weld seam is not lower than that of the pipe body
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[0025] The present invention is described in detail below:
[0026] Table 1 is the process value list of the embodiment of the present invention and comparative example;
[0027] Table 2 is a list of performance testing conditions of the embodiments of the present invention and comparative examples.
[0028] Each embodiment of the present invention is produced according to the following steps:
[0029] 1) Perform conventional decoiling, leveling, shear butt welding, looper, edge milling, plate flaw detection and forming on the steel plate;
[0030] 2) Perform high-frequency welding;
[0031] 3) Remove the burrs inside and outside the pipe and conduct ultrasonic flaw detection on the weld;
[0032] 4) Carry out simulated normalizing treatment on the weld, the treatment temperature is controlled at 900~930℃, the treatment speed is controlled at 10~20m / min, and the treatment time is 30~60s;
[0033] 5) Carry out water cooling, and cool to no more than 450°C at a cooling rate ...
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Provided is a method for manufacturing a wear resistant slurry conveying longitudinal welded pipe. The method comprises the steps of carrying out decoiling, flattening, shearing and butt welding, looping, edge milling, plate body flaw detection and forming; carrying out high-frequency welding; removing burrs and carrying out flaw detection on welding seams; carrying out analog normalizing treatment on the welding seams; carrying out water cooling; carrying out high-temperature tempering; carrying out air cooling until the temperature is lower than or equal to 200 DEG C; carrying out diameter fixing, size fixing, spray printing and outputting. According to the method for manufacturing the wear resistant slurry conveying longitudinal welded pipe, the heat treatment processes are changed and the heat treatment process parameters are controlled to improve the general mechanical performance of the welding seams, the erosive wearing resistant performance of the welding seams is improved, the erosive wearing resistant performance of the welding seams is improved by more 10% compared with the prior art, and the requirements for erosive wearing resistant performance of the high-frequency longitudinal welded pipe for conveying coal slurry, ore slurry and the like are met by being matched with the wear-resisting properties of a pipe body.
Description
technical field [0001] The invention relates to a method for preparing a steel pipe, in particular to a method for preparing a straight seam welded pipe for slurry transportation, and is especially suitable for high frequency straight seam welded pipes for slurry transportation such as coal slurry and ore slurry with erosion and wear resistance Preparation. Background technique [0002] The long-distance transportation of coal, ore and other resources has always been dominated by trains, automobiles, ships and other transportation methods. These transportation methods have disadvantages such as large intermediate loss, high cost, environmental pollution and low transportation efficiency. It is subject to many restrictions such as climate and transportation capacity. [0003] Slurry pipeline transportation is a transportation method that mixes granular solid mineral materials with liquid conveying medium, uses pump power to transport them in the pipeline, and separates the s...
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IPC IPC(8): B23P15/00
CPCB21C37/0807
Inventor 刘占增王剑龚涛孔君华张毅李利巍崔雷黄治军骆海贺李建华黄菲
Owner 武汉钢铁有限公司