GOST 12821 Stainless Carbon Steel Welding Neck Flange

Data

Product Introduction

GOST 12821 PN1.6 welding neck flange belongs to the Russian standard flange system. It is one of the manifestations of Russian standard flange (also known as GOST flange), and it is a common flange on equipment or pipeline.

Now the field of application of the flange is more and more widely, but not for professionals to choose the right flange is very difficult, just to face so many flange standards, we are not very clear. So let me take the Russian standard flange as an example. Explain it

Sealing surface form: protrusion (RF), concavo-convex (MFM), tongue and groove (TG), ring connection (RJ)
Material: Carbon Steel: ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;
Stainless steel (Stainess Steel): ASTM A182 F304, 304L, F316, 316L
Manufacturing standards: ANSI B16.5, HG20619-1997, GB / T9117.1-2000-GB / T9117.4-200, HG20597-1997
Connection: flange nut, bolt connection
Production process: professional forging, forging manufacturing and so on
Processing methods: high-precision CNC lathe turning, general lathe fine car, welding and other processing
Applications: Boiler and pressure vessels, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, stamping elbow food and other industries.

Welded neck flange not easy to distortion, good sealing, widely used, butt thinning transition weld joints ,horn shape, avoid shape change when welding in high temperature. applicable to high temperature pipeline, high pressure and low temperature pipeline, normally used to connect pipes and valves which PN is greater than 2.5MPa; also used to transport expensive, flammable, explosive media pipeline.