Forged pipe fittings refer to the pipe fittings that are mainly forged in the pipe fittings manufacturing industry. The content mentioned here refers to the latter forging.

Die forging method

According to the different types and requirements of pipe fittings, forged pipe fittings mainly adopt die forging, free forging and cutting process. The general die forging method has large flash and high material consumption. In order to reduce material consumption, some pipe fitting manufacturers have begun to adopt the flashless forming process, and have achieved good results. This section mainly introduces the process of die forging, free forging and cutting to make pipe fittings.

①Die forging

Suitable for small pipe fittings, such as tees, crosses, elbows, etc. With socket welds and threads, their shapes are more complex and must be made by die forging.

The blanks used for forging should be rolled profiles such as bars, thick-walled pipes or plates. When using steel ingots as raw materials, the steel ingots should be rolled into bars in advance or used as die forging blanks after forging to eliminate segregation, porosity and other defects in the steel ingots.

After the billet is heated, it is put into the die for forging (depending on the situation, it may also be forged after initial forging), and the pressure causes the metal to flow and fill the die cavity; if the forged billet has flash, it needs to be punched to remove the remaining flash. steps to complete all die forging work.

②Free forging

Pipe fittings of special shape or not suitable for die forging can be manufactured by free forging process. Free forging should forge the approximate shape of the pipe; such as tee, branch pipe should be forged.

③Cut.

Some tubular fittings can be cut directly from bar or thick-walled pipe, such as double-sleeve couplings and unions. When processing metal materials, the fiber flow direction should be roughly parallel to the axial direction of the pipe. Tee, cross, elbow and pipe fittings shall not be directly cut and formed with steel bars.

Manufacturing standards: ASMEB16.9, GB/T 12459, GB/T 13401, SH3408, SY/T0609, SY/T0510, JIS B2311, JIS B2312, etc.

Materials: stainless steel 304, 304L, 304H, 321, 316, 316L, etc.
　　　Carbon steel Q235B, 20, Q245R, Q345R, Q355, etc.
　　　Alloy steel 15CrMoG, 12CrMoVG, 15CrMo, etc.
　　　Duplex stainless steel 2205, 2507
　　　Nickel base alloy, NO6600, NO4400, NO8800, etc.

Sizes: seamless from 1/2”-28” (DN15-DN700); seamed from 1/2”-140” (DN15-DN3200) 

Wall thickness: SCH5S-SHC160

Raw materials: seamless pipe, welded pipe, plate welding and forging (for high pressure)

Manufacturing process: extrusion, pressing, cold working, machining, welding and heat treatment

Surface treatment: sand blasting and acid pickling and passivation;

In addition, the product can be customized and processed according to customer drawings.