By chemical composition: 1, the CR series: series of ferrite, column 2, CR - NI series markov system: system of austenite, abnormal series, series of precipitation hardening.
Second, in the classification of the microstructure: 1, austenitic stainless steel 2, ferritic stainless steel 3, martensite stainless steel 4, precipitation hardening stainless steel 5,duplex stainless steel
Third, there are several models:
1, good ductility, model 301 - used for forming products, also can rapid hardening by mechanical processing, good weldability, abrasion resistance and fatigue strength is better than that of 304 stainless steel.
2, model 302-304, corrosion resistance due to the carbon intensity of relatively high and better.
3, model 303 - by adding a small amount of sulfur and phosphorus from 304 are more likely to machining.
4, model 304 - gm model; The 18/8 stainless steel. GB brand of 0 cr18ni9.
5, model 309 - compared with 304 has better temperature resistance.
After 6, model 316-304, the second is the most widely used types of stainless steel, mainly used in the food industry and surgical equipment, add molybdenum elements make it get a kind of corrosion resistant special structure. As compared with 304, it has a better ability to resist chloride corrosion and therefore as "Marine steel" to use. SS316 is usually used for nuclear fuel recycling equipment. 18/10 grade stainless steel usually also fits the application level.
7, model 321 - except for adding the titanium reduces the weld material corrosion risk besides other performance similar to 304. Series 400 - ferritic and martensitic stainless steel.
8, model 408 - heat and weak corrosion resistance, 11% of Cr, Ni 8%. Model 409 - the cheapest model (UK), usually used in automobile exhaust pipe, is a ferritic stainless steel (chrome steel). Model 410 - martensite chromium steel (high strength), good wear resistance, corrosion resistance is poor
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)
