Hebei Zexu Pipe Manufacturing Co., Ltd.
Hebei Zexu Pipe Manufacturing Co., Ltd.
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316L Stainless Steel RF SO With Neck Flat Welded Flange Class150-1500
With neck flat welded flange full name with neck flat welded steel pipe flange English name :Slip-on abbreviation SO The neck flat welded flange, like the plate flat welded flange, is also a flange that extends the steel pipe, pipe fittings, etc. into the flange and connects with the equipment or pipe through the fillet weld
Advantages:Flat welded flange with neck is also a flat welded flange, because it has a short neck, which improves the strength of the flange and improves the bearing strength of the flat welded flange with neck. So it can be used on higher pressure pipes.
316L is a stainless steel material grade, AISI 316L is the corresponding American grade, sus 316L is the corresponding Japanese grade. China's unified digital code is S31603, the standard grade is 022Cr17Ni12Mo2(new standard), and the old grade is 00Cr17Ni14Mo2, which mainly contains Cr, Ni, Mo, and the number indicates the approximate percentage contained. The national standard is GB/T 20878-2007(current version)
316L has a wide range of applications in the chemical industry because of its excellent corrosion resistance, 316L is also a derivative of 18-8 austenitic stainless steel, adding 2~3% Mo element. On the basis of 316L, many steel grades are also derived, such as 316Ti after adding a small amount of Ti, 316N after adding a small amount of N, and 317L is derived from increasing Ni and Mo content.
Most of the existing 316L on the market are produced in accordance with the American standard. For cost considerations, steel mills generally put the Ni content of products as close to the lower limit as possible. The American standard stipulates that the Ni content of 316L is 10~14%, and the Japanese standard stipulates that the Ni content of 316L is 12~15%. According to the minimum standard, there is a 2% difference between the American standard and the Japanese standard in the Ni content, which is still quite huge in the price, so customers need to see clearly when purchasing 316L products, and the products refer to ASTM or JIS standards.
The Mo content of 316L makes the steel has excellent corrosion resistance and can be safely used in halogen ion environments such as Cl-. Because 316L is mainly used for its chemical properties, steel mills have slightly lower surface inspection requirements for 316L (relative to 304), and customers with higher surface requirements should strengthen surface inspection efforts.
The two most commonly used stainless steel 304,316 (or corresponding to the German/European standard 1.4308,1.4408), 316 and 304 in the chemical composition of the main difference is that 316 contains Mo, and it is generally recognized that 316 corrosion resistance is better than 304 in high temperature environment more corrosion resistance. Therefore, in a high temperature environment, engineers generally choose parts of 316 material. But the so-called thing is not absolute, in the concentrated sulfuric acid environment, then the high temperature do not use 316. Otherwise it can be a big thing. People who learn machinery have learned threads, remember that in order to prevent thread bite at high temperatures, you need to apply a black solid lubricant: molybdenum disulfide (MoS2), from which you can draw two conclusions: one :Mo is indeed a kind of high-temperature material (know what crucible to melt gold? Molybdenum crucible!) . Two: Molybdenum is easy to react with high sulfur ions to produce sulfide. So no stainless steel is super resistant to corrosion. In the end, stainless steel is a piece of impurities (but these impurities can be more corrosion resistant than steel) more steel, steel can react with other substances.
