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Heavy wall seamless steel pipe

Date:2021-06-10View:338Tags:Heavy wall seamless steel pipe,Thick-walled seamless steel pipe


The manufacturing process of thick-walled seamless steel pipe production can be divided into four basic methods: cold drawn, cold rolled, hot rolled, and thermally expanded. According to the purpose,it can be divided into seamless steel pipes for structure; seamless steel pipes for transportation; seamless steel pipes for boilers. ; High-pressure seamless steel tubes for boilers; high-pressure seamless steel tubes for fertilizer equipment; seamless steel tubes for geological drilling; seamless steel tubes for petroleum drilling; seamless steel tubes for petroleum cracking; seamless steel tubes for ships; cold-drawn cold-rolled precision seamless steel tubes Steel pipe; various alloy pipes. Seamless steel pipes are represented by outer diameter and wall thickness. Thick-walled seamless steel pipes are mainly used for mechanical processing, coal mines, hydraulic steel, and many other purposes.



Production Process


The production process of general seamless steel pipes can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is generally more complicated than that of hot rolling. In the sizing test, if the surface does not respond to cracks, the pipe must be cut by a cutting machine and cut into a blank of about one meter in length. Then enter the annealing process. Annealing should be pickled with acidic liquid. When pickling, pay attention to whether there is a large amount of blistering on the surface. If there is a large amount of blistering, it means that the quality of the steel pipe does not meet the response standard. In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes. Much rough, without too many burrs on the caliber.


The delivery state of hot-rolled seamless steel pipes is generally delivered after heat treatment in the hot-rolled state. After the quality inspection, the hot-rolled seamless steel pipes must be strictly hand-selected by the staff. After the quality inspection, the surface should be oiled, and then followed by multiple cold drawing experiments. After the hot-rolling treatment, the piercing experiment should be carried out. If the perforation is too large, it must be straightened. After straightening, it is transported by the conveyor to the flaw detector for flaw detection experiment. Finally, the label is attached, the specifications are arranged, and then it is placed in the warehouse.


Process flow


Process flow of sanitary mirror tube:


Tube blank-inspection-peeling-inspection-heating-perforation-pickling-grinding-lubrication and air drying-welding head-cold drawing-solution treatment-pickling-pickling Passivation-inspection-cold rolling-degreasing-cutting-air drying-internal polishing-external polishing-inspection-marking-finished product packaging


Process flow of thick-walled industrial pipe:


Tube blank-inspection-peeling-inspection-heating-perforation-pickling-mushroom repair-lubrication and air drying-welding head-cold drawing-solution treatment-pickling-pickling Passivation-inspection


Thick-walled steel pipe specification table
specification
406*16 457*32 508*80 530*22 660*80 820*55
406*17 457*35 508*90 530*25 660*90 820*60
406*18 457*40 508*100 530*28 660*100 820*70
406*19 457*45 530*16 610*30 660*150 820*80
406*20 457*50 530*17 610*32 710*20 820*90
406*22 457*55 530*18 610*35 710*22 820*100
406*25 457*60 530*19 610*40 710*25 820*150
406*28 457*65 530*20 610*45 710*28 820*200
406*30 457*70 530*22 610*50 710*30 864*40
406*32 457*80 530*25 610*55 710*32 864*55
406*35 457*90 530*28 610*60 710*35 864*60
406*40 457*100 530*30 610*65 710*40 864*70
406*45 480*16 530*32 610*70 710*45 864*80
406*50 480*17 530*35 610*80 710*50 864*90
406*55 480*18 530*40 610*90 710*55 864*100
406*60 480*19 530*45 610*100 710*60 864*150
406*65 480*20 530*50 610*150 710*65 864*200
406*70 480*22 530*55 630*18 710*70 900*60
406*80 480*25 530*60 630*19 710*80 900*70
406*90 480*28 530*65 630*20 710*90 900*80
426*16 480*30 530*70 630*22 710*100 900*90
426*17 480*32 530*80 630*25 710*150 900*100
426*18 480*35 530*90 630*28 720*25 900*150
426*19 480*40 530*100 630*30 720*28 900*200
426*20 480*50 559*16 630*32 720*30 950*60
426*22 480*55 559*17 630*35 720*32 950*70
426*25 480*60 559*18 630*40 720*35 950*80
426*28 480*65 559*19 630*50 720*40 950*90
426*30 480*70 559*20 630*55 720*50 950*100
426*32 480*80 559*22 630*60 720*55 950*150
426*35 480*90 559*25 630*65 720*60 950*200
426*40 480*100 559*28 630*70 720*65 1000*80
426*45 508*16 559*30 630*80 720*70 1000*90
426*50 508*17 559*32 630*90 720*80 1000*100
426*55 508*18 559*35 630*100 720*90 1000*150
426*60 508*19 559*40 630*150 720*100 1000*200
426*70 508*20 559*50 660*20 720*150 1050*80
426*80 508*22 559*55 660*22 8*40 1050*90
426*90 508*25 559*60 660*25 8*45 1050*100
426*100 508*28 559*65 660*28 8*50 1050*150
457*16 508*30 559*70 660*30 8*55 1050*200
457*17 508*32 559*80 660*32 8*60 1100*80
457*18 508*35 559*90 660*35 8*70 1100*90
457*19 508*40 559*100 660*40 8*80 1100*100
457*20 508*50 610*16 660*50 8*90 1100*150
457*22 508*55 610*17 660*55 8*100 1100*200
457*25 508*60 610*18 660*60 8*150 1200*80
457*28 508*65 610*19 660*65 8*200 1200*90
457*30 508*70 610*20 660*70 820*50 1200*200