Production process standard for butt welding flanges
Butt welding flange is not easy to deform, has good sealing, is widely used, has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, the distance between the welding joint and the joint surface is large, and the joint surface is protected from welding temperature deformation. The trumpet-shaped body structure is suitable for pipelines with large fluctuations in pressure or temperature or pipelines with high temperature, high pressure and low temperature. It is generally used for the connection of pipelines and valves with a PN greater than 2.5MPa; it is also used for transportation of expensive, flammable and explosive materials. on the medium line.

Production Process

Forging, casting, plate turning

Flat welding flange

The connection form is single-sided welding and double-sided nut connection.

Product features Beautiful appearance, smooth surface, acid and alkali resistance, anti-corrosion, strong texture performance. Production process, sub-oxygen furnace opening, integral forging or finished product forging and cutting.

Processing methods High-precision CNC lathe turning, CNC radial drilling drilling.

Product parameters

(1) Bolt hole center circle diameter: 50mm----2130mm (2) Bolt hole diameter: 11mm-30mm

(3) Flange thickness: 12mm-58mm

(4) Tube outer diameter: A(17.2-2032MM)B(14-2020MM)(5) Flange inner diameter: A(18-2036MM)B(15-2024MM)(6) Flange theoretical weight: 0.36kg-- 234.6kg (DN1800)

Production standards

Common production standards:
Ministry of Chemical Industry Standard HG/T20592-2009, HG/T20615-2009

National standards GB/T9115.1-2000, GB/T9115.2-2000, GB/T9115.3-2000, GB/T9115.4-2000
Mechanical Department Standard JB/T86.2-94
Marine Standard CB/T47-1999
production materials
WCB (carbon steel), LCB (low temperature carbon steel), LC3 (3.5% nickel steel), WC5 (1.25% chromium 0.5% molybdenum steel), WC9 (2.25% chromium), C5 (5% chromium% molybdenum), C12 ( 9% chrome 1% molybdenum), CA6NM (4 (12% chrome steel), CA15(4) (12% chrome), CF8M (316 stainless steel), CF8C (347 stainless steel), CF8 (304 stainless steel), CF3 (304L stainless steel) ), CF3M (316L stainless steel), CN7M (alloy steel), M35-1 (Monel), N7M (Hasta nickel alloy B), CW6M (Hasta nickel alloy C). cY40 (Inconel)