The material of stainless steel flange is according to the different models and different use, chemical composition and production. Stainless steel can be use, chemical composition and microstructure to general classification.
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)