Steel Weld Neck Flange GOST-33259 Carbon Steel Stainless Steel

Product Introduction

Butt-welding flange with neck refers to the flange with neck and round pipe transition and connected with pipe butt welding.
Butt-welding flanges are applicable to pipelines with large pressure or temperature fluctuations or pipelines with high temperature, high pressure and low temperature, and also to pipelines transporting expensive, flammable and explosive media.

Sealing surface form and code

Raised face (RF); Full plane (FF); Convex and convex surface (MFM); Tenon and groove surface (TG); Ring connection surface (RJ);

Material

Carbon steel flange material: 20 #, Q235, 16Mn, ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;
Stainless steel flange material: ASTM A182, F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Standard Classification

American standard: ANSI B16.5, ANSI 16.47 Class150, 300, 600, 900, 1500 (TH, LJ, SW)

National standards: GB/T9119-2010, GB/T255-81

GOST-12821, GOST-33259,JIS B2220, BS 3293, SANS 1123

Performance Characteristics

Butt-welding flange is not easy to deform, has good sealing performance and is widely used;
Butt-welding flange connection is easy to use and can withstand relatively large pressure;
There are corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welded junction and the joint surface is large, and the joint surface is free from welding temperature deformation;
At the same time, it is also used in the pipeline for transporting expensive, flammable and explosive media.

Production Process

1: The whole forging process of round steel;
2. Finished product forging, cutting and forming process;

The process of neck butt-welding flange produced by our company is called die forging, which is formed by placing the heated blank in the forging die fixed on the die forging equipment;
Basic process of die forging Die forging process: blanking, heating, pre-forging, final forging, punching, trimming, tempering, shot peening;
Common processes include upsetting, drawing, bending, punching and forming;
Common die forging equipment includes die forging hammer, hot die forging press, flat forging machine and friction press.
Generally speaking, forged flange is of better quality, generally produced by die forging, with fine crystal structure and high strength, and of course, the price is also higher;