Product Name：Stainless Steel JIS Butt Welded Steel Pipe Flange
A neck butt weld flange is a type of flange that has a tapered neck and is butt welded to a simplified or pipe. It belongs to the integral flange. Due to the excessive structure of the cone neck and the butt welding connection, the strength and rigidity of the flange are strengthened, the butt weld flange is not easily deformed, the seal is good, and the application is extensive.
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Why sometimes choose stainless steel 304 butt welding flange
Let's first tell a fact:
Austenitic stainless steel pipes are commonly used in various corrosive environments. However, if you are careful, you will find that in the design documents of some units, as long as DN ≤ 40, regardless of various materials, the socket fittings are basically used. In the design documents of other units, stainless steel pipes, no matter how small the caliber, also use butt-welded pipe fittings instead of socket pipe fittings.
As the saying goes: In order to ensure the welding quality of small-diameter pipes and avoid welding through during high-current welding, socket connections are often used instead of butt welding. So, why do other people's units do not need socket fittings for small-caliber stainless steel pipes? This involves a problem: crevice corrosion.
What do we mean by crevice corrosion?
When there are crevices on the surface of metal components due to foreign matter or structural reasons (usually 0.025-0.1mm), it is difficult for the corrosive medium in the crevices to migrate, which in turn leads to metal corrosion, which is called crevice corrosion. Crevice corrosion often becomes the inducement of other corrosion (such as pitting corrosion and stress corrosion), so engineering strives to avoid the occurrence of crevice corrosion. For media prone to crevice corrosion, the existence of crevices should be avoided in the design of the pipeline structure.
