1. 304 stainless steel pipe, is one of the austenitic stainless steel with large application and the widest range of use, suitable for mechanical structure, acid pipeline, etc..
2. 304L stainless steel pipe, in order to solve the solution due to Cr23C6 precipitation caused by 304 stainless steel pipe in some conditions there is a serious tendency to intergranular corrosion and the development of ultra-low carbon austenitic stainless steel pipe, its sensitized state of the resistance to intergranular corrosion is significantly better than the 304 stainless steel pipe. In addition to slightly lower strength, other properties with 321 stainless steel pipe, mainly used for corrosion-resistant equipment and components that need to be welded and can not be solid solution treatment, can be used for mechanical structures.
3. 304H stainless steel pipe. 304H stainless steel pipe internal branch, carbon mass fraction in 0.04%-0.10%, high temperature performance is better than 304 stainless steel pipe.
4. 316L stainless steel tube. Ultra-low carbon steel, with good resistance to intergranular corrosion in the sensitized state, suitable for petrochemical industry.
5. 316H stainless steel pipe. 316 stainless steel pipe internal branch, carbon mass fraction in 0.04%-0.10%, high temperature performance is better than 316 stainless steel pipe.
6. 321 stainless steel tube. Titanium stabilized austenitic stainless steel tube, adding titanium to improve intergranular corrosion resistance, and has good high temperature mechanical properties, can be replaced by ultra-low carbon austenitic stainless steel tube. High temperature or hydrogen corrosion resistance and other specialized occasions recommended.
7. 347 stainless steel tube. Niobium stabilized austenitic stainless steel tube, add niobium to improve intergranular corrosion resistance, corrosion resistance in acids, alkalis, salts and other corrosive media with 321 stainless steel tube, good welding performance, corrosion resistance milk high temperature performance is good for heat exchanger tubes, furnace tubes and so on.
8. 904L stainless steel tube. Super fully austenitic stainless steel tube, is Finland Otokumpu (OUTOKUMPU) company invented a super austenitic stainless steel tube, its nickel mass fraction of 24% to 26%, carbon mass fraction of less than 0.02%, excellent corrosion resistance, non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, phosphoric acid, has very good corrosion resistance, and at the same time has a good resistance to crevice corrosion and stress corrosion resistance. . Applicable to a variety of concentrations of sulfuric acid below 70 ℃, under normal pressure resistance to any concentration, any temperature of acetic acid and formic acid and acetic acid mixed acid corrosion resistance is also very good. The case of the Rolex watch is also made of 904L stainless steel.
