New process line for ferritic stainless steel production

Apr. 24, 2019

New process line for ferritic stainless steel production

304 Hairline Stainless Steel Manufacturer shares that in process of ferritic stainless steel, 430 ferritic stainless steel usage and output is the most, in some countries only after the 304 austenitic stainless steel. The main advantages of 430 ferritic stainless steels are low price, small thermal expansion coefficient and better resistance to chloride stress corrosion than 300 series stainless steels. Especially after the addition of trace elements niobium, titanium, copper, aluminum, etc., the deep drawing performance, welding performance, corrosion resistance, antimicrobial resistance and high temperature resistance of ferritic stainless steel have been improved to varying degrees, so that ferritic stainless steel has a wide range of applications.

430 ferritic stainless steel cold rolled strip steel is widely used for deep drawing of kitchen equipment, household appliances, etc. Therefore, the cold forming properties of this type of ferritic stainless steel are very important. In addition to the influence of chemical composition on the cold forming performance, the production process also has an important impact on the cold forming performance.

In the production process of ferrite stainless steel, in order to meet the requirements of final cold rolling, a key and costly process is annealing after hot rolling. The traditional process line is that hot rolled strip steel should be annealed in the hooded furnace, the whole annealing cycle is long, and the energy consumption is very high.

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In order to reduce the energy consumption and reduce production cost and improve the competitiveness of the products, at the same time, to meet the requirements of the final cold rolling of hot rolled strip, Germany thyssenkrupp AST company according to their own a large number of ferritic stainless steel production, which is about the characteristics of 430 ferrite stainless steel, after many years of research, testing, developed a relatively low energy consumption, short time-consuming bell type furnace annealing process, with cost competitiveness and can meet the requirements of the final cold rolled out the new process, namely direct annealing process. The basic principle of the process is to use the residual heat of hot rolling to annealing immediately.

This paper introduces in detail the equipment of direct annealing process and its advantages (such as low heat loss, low power consumption, short cycle, about 60% reduction of production cost, and satisfactory properties).

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