Stainless steel elbow elbow distinguished mainly of different materials, the chemical composition of its surface contained elbow will keep for a long time will not rust, will not corrode. According to standard production can be turned into: 1 to produce a standard can be divided into national standard, the ship standard, electricity standard, water standard, American standard, German standard, Japanese standard, the Russian standard and so on. 2. production methods can be divided into push the system, pressing, forging, casting and other 90 ° stainless steel elbow pipe installation is mainly used in a connection pipe for connecting the pipe bend. Connect two identical or different nominal pipe diameter, so the pipeline for 90 ° turn. Stainless steel is usually based on the increase in the proportion of high-Cr, Ni alloy is made, the content ratio of up to 20%. Common steel grades: 304,304L, 321,316,316L, 1Cr18Ni9Ti, 0cr18ni9, steel front with a digital representation of several Japanese, American steel representation, the last one (1Cr18Ni9Ti) for domestic steel representation. Stainless characteristics: strength, toughness index is the best kinds of steel, the most prominent advantage is anti-corrosion, chemical and paper corrosive applications must use stainless steel, of course, the cost is high! ASME / ANSI B16.9 factory-made forged steel pipe fittings ASME / ANSI B16.11 socket welding and threaded forged fittings ASME / ANSI B16.28 steel welded small radius bends and hairpin ASME B16.5 tube method Lan and flange fittings MSS SP-43 forged stainless steel pipe fittings MSS SP-79 socket weld reducer inserts MSS SP-83 socket weld and threaded union MSS SP-97 socket welding, threaded and butt ends overall strengthening Headers short radius elbows are made of stainless steel 201.304 other steel 20 #, 20G, etc., etc. 12CR1MOV steel.