Ferritic stainless steel (400 series) has a bulk-centered cubic crystal structure. This kind of steel generally does not contain nickel, and sometimes contains a small amount of elements such as Mo,Ti,Nb. This kind of steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, excellent stress corrosion resistance, etc., and is mostly used in the manufacture of atmospheric and water vapor. Water and oxidizing acid corrosion components. The price of ferrite stainless steel is not only relatively low and stable, but also has many unique characteristics and advantages. It has been proved that ferrite stainless steel is a kind of stainless steel in many applications where only austenitic stainless steel (300 series) was originally thought to be used Ferritic stainless steel contains no nickel and the main elements are chromium (> 10%) and iron. Chromium is a special corrosion resistant element of stainless steel, and its price is relatively stable.
Chromium content: 15%
Structure: bulk centered cubic crystal structure
Characteristics: large thermal conductivity, small expansion coefficient, etc.
Applications: electronic and electrical appliances, metal stamping parts, spring shrapnel, pad diaphragm, precision parts, accessories, bellows, seals, Etching part kitchen equipment sink (SINK) general drawing material (high surface requirement) gas stove-surface requirement high refrigerator (freezer tank) electrical appliance washing machine, Construction material MIRROR (Mirror material) for the Construction Tube of Microwave oven Decoration Tube of drying Machine and Grinding the window of inside and outside Decoration material of Elevator, door Chemical equipment Heat Exchanger Boiler, Tank chemical furnace special purpose transport equipment container iron Road vehicles / automobile industry / water industry / construction / home appliances / environmental protection industries / industrial facilities etc.
Category 1: 409: suitable for non-corrosive or mild corrosion environments such as containers, long distance buses, cars, display frames, etc.
Category 2: 430 is the most widely used, most of the performance is similar to 304, general indoor use, with good corrosion resistance. The typical 430 is often used as a 304 substitute for kitchen facilities, dishwashers, pots, etc.
Category 3: 430TiN 439441, etc.: good weldability and formability, in most cases better than 304, used in flume, heat exchange pipe (sugar industry, etc.), automobile exhaust system, welding site of washing machine, etc. The third category can be used as an alternative to 304 for more demanding performance.
Category 4: 434N 436C444: add molybdenum to increase corrosion resistance for hot water box, solar water heater, automobile exhaust system, electric kettle, microwave oven parts, etc. 444 is equivalent to 316.
Class 5: 446445447 et al.: more chromium and molybdenum to improve corrosion resistance and oxidation resistance, corrosion resistance and oxidation resistance is better than 316, typical use coastal and other corrosion resistant environment, JIS447 corrosion resistance is comparable to titanium metal.
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