Ferritic stainless steel
15%~30% chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is better than other types of stainless steels. In this category, there are Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28, etc. Because of its high chromium content, ferritic stainless steel has good corrosion resistance and oxidation resistance, but its mechanical properties and process properties are poor. It is mostly used for acid-resistant structures with little stress and as anti-oxidation steel. This type of steel can resist corrosion from the atmosphere, nitric acid and salt solutions, and has the characteristics of good high-temperature oxidation resistance and low thermal expansion coefficient. It is used in nitric acid and food factory equipment, and can also be used to make parts that work at high temperatures, such as gas turbine parts, etc. .
Austenitic stainless steel
Containing more than 18% chromium, it also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good overall performance, resistant to corrosion by various media. Commonly used grades of austenitic stainless steel are 1Cr18Ni9, 0Cr19Ni9 and so on. The Wc<0.08% of="" 0cr19ni9="" steel="" is="" marked="" as"0"="" in="" the="" steel="" number.="" this="" type="" of="" steel="" contains="" a="" large="" amount="" of="" ni="" and="" cr,="" making="" the="" steel="" austenitic="" at="" room="" temperature.="" this="" type="" of="" steel="" has="" good="" plasticity,="" toughness,="" weldability,="" corrosion="" resistance="" and="" non-magnetic="" or="" weak="" magnetic="" properties.="" it="" has="" good="" corrosion="" resistance="" in="" oxidizing="" and="" reducing="" media.="" it="" is="" used="" to="" make="" acid-resistant="" equipment,="" such="" as="" corrosion-resistant="" containers="" and="" equipment="" lining,="" conveying="" pipes,="" nitric="" acid="" resistant="" equipment="" parts,="" etc.,="" can="" also="" be="" used="" as="" the="" main="" material="" of="" stainless="" steel="" clock="" and="" watch="" accessories.="" austenitic="" stainless="" steel="" generally="" adopts="" solid="" solution="" treatment,="" that="" is,="" the="" steel="" is="" heated="" to="" 1050~1150℃,="" and="" then="" water-cooled="" or="" air-cooled="" to="" obtain="" a="" single-phase="" austenite="">