Non-standard flange is designed used for sealing and fastening. It is extensively applied in aerospace industry, petroleum industry and chemical industry. Leaving aside processing capability, the flange features a relatively large size, which makes transportation quite difficult. Hence, integrated machining is impossible, which makes it necessary to divide the flange into different parts and then produce them separately. Generally, the flange is divided into several arcs, which are manufactured individually.

First, we need to forge workblanks into square billets, which are then turned into arcs by cold bending. After annealing and thermal treatment, those arcs make up a whole circle, which will be put on a vertical lathe where the shape and the size are determined. Then, the flange will be delivered to construction sites, where arcs get welded together and then welded onto a pressure container as a whole.

Non-standard flange includes vessel flange and pipe flange. With the same nominal diameter, vessel flange and pipe flange have different sizes. Therefore, they are not interchangeable. Non-standard flanges are produced in accordance with different kinds of standards including GB, ASTM, JIS, DIN, UNI, HG, JB and ASME. The working pressure of non-standard flange ranges from 0.6Mpa to 32Mpa. It can be made of different kinds of steel such as 201, 202, 301, 302, 303, 304L, 309S.310S, 316, 316L, 317, 317L, 321, 410, 420, etc. Pressure grade, raw materials and standards of non-standard flange are special. Hence, users should pay attention when they need non-standard flange, so that they can choose exactly what they need.

Square Flange
Square Flange is referred to as either threaded or screwed. It is used to connect other threaded components in low pressure, non- critical applications. No welding is required.

Available Sizes
3/8"-24", DN10A-DN600A
150 Square Flange: 8 holes Ф10
200 Square Flange: 12 holes Ф12
250 Square Flange: 12 holes Ф12
300 Square Flange: 12 holes Ф14
400 Square Flange: 12 holes Ф14
500 Square Flange: 16 holes Ф14
600 Square Flange: 16 holes Ф18
700 Square Flange: 20 holes Ф18
800 Square Flange: 20 holes Ф18

Standards
ASME B16.5

Raw Materials
Carbon Steel: ASME/ASTM A105, A350LF2,
Stainless Steel: ASTM/ASME SA182 F 304, 304L, 304H, 309H, 310H, 316, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H.
Alloy Steel: ASTM/ASME A182 GR F5, F9, F11, F12, F22, F91

Pressure Grade
PN2.5- PN42

Producing Process
Cutting of Raw Material --- Die Forging --- Machining

Application
The flange is widely used in many areas such as power generation plant, petroleum industry, natural gas system, chemical industry, shipbuilding industry, heating system, paper-making industry, metallurgy industry, etc.