Differences in processing technology of special-shaped steel strips

There are many industries that use special-shaped steel strips and other products. You should not know that much. The heat treatment method can change the chemical composition and structure of the product surface. This method can be divided into different methods according to the elements that penetrate into the surface. In addition, chemical heat treatment develops rapidly, and new technologies are applied more and more. When we process special-shaped steel strips, there are mainly two technologies: passivation and pickling.

Passivation and pickling are used to treat the surface of the steel strip. There are many differences between the two. The main purpose of passivation is to prevent oxidation and corrosion of the product. Regarding the pickling treatment, this is to remove the surface after high temperature welding, heat treatment or thermal processing. of oxide skin.

Pickling can also clean red rust-corroded special-shaped steel strips and several steel particle pollutants, but it should be noted that if the acid solution on the surface after pickling is not cleaned, it will start to rust and corrode, causing subsequent The corrosion resistance of the steel surface decreases. This process can be used for the surface treatment of some series of special-shaped steel strips. The pickling operation will lead to the removal of impurities from the metal surface, and then slightly change the size, so the result will definitely change.

Analysis on the development status of special-shaped steel strip

In recent years, with the improvement of my country's industrialization level, the production and rolling level of special-shaped steel strips in my country has been greatly improved compared with the previous century. The localization of section steel has partially reached the international advanced level, but at the same time, it is found that in the production and research and development of many small and medium-sized section steel, the level of my country's section steel manufacturers is still far behind many European countries, especially in dimensional accuracy control and section shape. In terms of detail processing, many products are far from their level.

In recent years, after realizing this gap, many private manufacturing enterprises earnestly study foreign advanced technology and production experience, combine their own production practice, and through continuous exploration, have achieved gratifying results in many fields, reducing the procurement cost of domestic customers , to improve the production level of special-shaped steel strip in my country.

Due to its particularity and singleness of use, special-shaped steel strips require higher precision and equipment capacity than simple steel strips. Due to their complex cross-sectional shapes, especially special steel strips in many special cases, due to experience The design and production of hole-shaped steel is much more difficult than that of simple-shaped steel. Therefore, the production cost of shaped steel is higher than that of simple-shaped steel. Demand tends to be small, so this type of steel production system is not very large.

The development of special-shaped strips is mainly the development of product varieties, including cross-sectional shapes, materials and properties. Extrusion, skew rolling and cold drawing are reliable methods for producing special-shaped tubes, which are suitable for the production of special-shaped tubes of various sections and materials. In order to produce All kinds of special-shaped pipes require many production methods. In the timely era of the 20th century, China developed roll drawing, extrusion, hydraulic, rolling, spinning, continuous rolling, rotary forging, demoulding, etc. on the basis of cold drawing. Ten production methods, continuous improvement and creation of new equipment and technologies.

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