Forged fittings are used to combine or connect pipes, pumps, valves, and other equipment to create piping systems with a diameter of less than 2 or 4 inches. There are principally two kinds of fashioned fittings called socket-welded fittings which are associated by filet welding to pipes and the second is threaded fittings where the pipe is threaded onto the fittings. It is made from solid steel blocks, which are machined within the tolerances set by the applicable specifications to obtain the final shape required. Forged joints are made by bolting two forged joints together with a gasket between them to give a seal.
Carbon Steel ASTM A105 and Stainless Steel SS316 ASTM A182 are commonly available two materials of Forged pipe fittings. The coating of cast pipe fittings in carbon steel A105 can be further strengthened by galvanizing against corrosion.
For any application, fittings come in varied classes and material grades. The fittings come in class 3,000 and 6,000. Though there are class 2,000 and 9,000 fittings, these are rarely used and class 3,000 and 6,000 remain the most common type of fittings used. Forged fittings usually vary in sizes from 1/8 "to 4.". And common parts including couplings, tees, hex bushings and nipples are available in reduced sizes.
Class 3,000 and 6,000 forged pipe fittings occur in two connection types: Socket Weld, or Threaded. The most popular thread type is NPT (National Pipe Thread) while BSPP (British Standard Pipe Parallel thread) is also used for other sections such as Complete Couplings, Hex Bushings and Hex Nipples. Socket welding fitting is substantially more common than threaded, as most applications involve the full sealing off of a line and the removal of any leakage possibility.
Forged pipe fittings' applications range from the chemical, petrochemical, power generation and OEM manufacturing industries to other applications where there is vibration, high pressure or extremely corrosive conditions.
The mechanical characteristics of casted fittings are poorer than those of fabricated fittings of the same type. Furthermore, forged fitting process can ensure continuity of fibrous tissue, making fibrous tissue of forged fittings consistent with the appearance and complete metal flow.