Common seamless steel pipe manufacturing materials and uses
Generally, seamless steel pipes are made of high-quality carbon steels such as 10, 20, 30, 35, 45, low-alloy structural steels such as 16Mn, 5MnV, or alloy steels such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc., which are hot-rolled or cold-rolled. Seamless pipes made of low-carbon steels such as 10 and 20 are mainly used for fluid delivery pipelines. Seamless pipes made of medium-carbon steels such as 45 and 40Cr are used to manufacture mechanical parts, such as stress-bearing parts of automobiles and tractors. Generally, seamless steel pipes must ensure strength and flattening tests. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated states; cold-rolled steel pipes are delivered in hot-rolled or heat-treated states.
The manufacturing process and steps of stainless steel seamless pipes should be informed in advance that the manufacturing process of stainless steel seamless pipes is different, and the corresponding manufacturing process is also different. For example: stainless steel seamless steel pipes are divided into cold-rolled pipes and hot-rolled pipes. For stainless steel sanitary seamless pipes with high size and quality requirements, cold rolling, cold drawing or a combination of the two must be used.
First, the manufacturing steps of stainless steel seamless pipes:
The standard of 304,316L high-quality stainless steel material pipes is empty, starting and annealing operations.
1. The above operation is followed by a multi-pass cold drawing (cold rolling) process. The cold rolling of the steel pipe is carried out on a multi-roll rolling mill. The stainless steel pipe is rolled with a circular hole type composed of a variable-section circular groove and a fixed cone head.
2. The stainless steel pipe after cold rolling has the advantages of large yield coefficient, no flaring, and bending. In order to meet the health grade standard of stainless steel pipes, the cold-rolled pipes should undergo bright annealing, demagnetization, pickling, straightening and other steps.
3. Pickling stainless steel pipe, while the pipe is to remove the oil, rust, spot welding, oxide layer, free iron and other dirt, the surface becomes silver after the pickling passivation surface, and prevent the occurrence of metal corrosion and hydrogen embrittlement, inhibit the production of acid mist.
4. After the above process, the next step is the polishing process of stainless steel pipe. The standard of the polishing net of the inner and outer walls of the pipeline is 400 mesh, and the finish of the inner and outer surfaces of the pipeline polishing reaches the mirror standard (ie, the hygiene standard).
5. The polished stainless steel pipe should be internally inspected and strictly manually selected by the steel pipe quality inspector through the metal flaw detector (or water pressure test), and the qualified products are packaged and delivered.
Production process of stainless steel seamless steel pipe.
Production process: 1. Steelmaking → 2. Rolling round steel (flaking) → 3. Perforation (annealing) → 4. Cold drawing → 5. Cold rolling (annealing, demagnetization, pickling, cleaning) → 6. Inner wall polishing (400 mesh) → 7. External wall polishing (400 mesh) → 8. Air pressure test → 9. Surface test → 10. Attach trademark and certificate of conformity × 11. Packaging → 12. Delivery
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