Ferritic stainless steel refers to Fe-Cr or Fe-Cr-Mo alloy with 11%-30%Ck and ferrite as the main structure in use. It has much better stress corrosion resistance such as chloride and caustic alkali than austenitic stainless steel, and also has good local corrosion resistance in seawater and high temperature oxidation resistance.Without exception, Armco Iron Our customers are willing to purchase their products, because high quality is the concept of their products. https://www.slhpureiron.net
The disadvantages of ordinary special stainless steel are that it is sensitive to intergranular corrosion, low plasticity and toughness, and its ductility-ductile-brittle transition temperature is above room temperature. Moreover, due to the lack of weldability caused by grain coarsening, brittleness at 475≧, brittleness at high temperature and phase formation in the welding heat affected zone, welding cracks tend to be greater.
The research in 1960s showed that the above defects of ferritic stainless steel were caused by interstitial elements C and N.. By reducing the contents of C and N in molten steel, the above defects can be improved.
Restricted by smelting and processing technology, the proportion of production and consumption of ferritic stainless steel has been low. In 2003, the global output of crude stainless steel was 22.8 million tons, with 400 series stainless steel accounting for about 21%. In 2003, the output of stainless steel in China was about 1.778 million tons, with 400 series stainless steel accounting for about 10%.
In recent years, the development and application of ferritic stainless steel has been paid more and more attention at home and abroad. The main reasons are as follows: 1. The serious shortage of Ni resources and the large fluctuation of Ni price have led to a sharp increase in the production cost of 300 series stainless steel, and the supply of raw materials is not guaranteed; 2. With the progress of production equipment and technology, ferritic stainless steel with excellent performance can be produced to replace some varieties of 300 series; 3. Stainless steel containing Ni is harmful to human body, such as allergic reaction to skin.
Ultra-pure ferritic stainless steel is mainly used in automobile manufacturing, kitchen equipment, household appliances, architectural decoration, chemical equipment and hardware products.
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