About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
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 |
E-mail: sales@eastern-steels.com
