Guide on Stainless Steel Forged Fittings

stainless steel forged fittings

Some industrial or commercial systems depend on stainless steel forged fittings because they enable the connection of two or more pipes. Forged fittings, which are different from buttweld fittings used for pipe systems with larger diameters, are often used on piping systems with a diameter of less than 2 or 4 inches. Utilizing heat and mechanical energy, solid stainless steel blanks are shaped into useful shapes within the tolerances specified by the relevant requirements during the fabrication of stainless steel forged fittings. There are many different sizes and diameters of these forged fittings, as well as a variety of shapes, to accommodate any kind of pipe joining.

These steel forged fittings must be resistant to corrosion. A socket weld or forged threaded steel fitting that is rust-prone may prematurely deteriorate and develop leaks. A threaded steel forged fitting’s installation or removal may become challenging due to corrosion. Forged SS fittings should be both strong and abrasion-resistant while remaining lightweight for use in high-temperature applications or challenging weather conditions. Additionally, high-pressure (3,000 lb, 6,000 lb, and 9,000 lb) piping systems installation should be possible with stainless steel forged fittings.

Variety and Application

The class classification of 3000, 6000, or 9000 assigned to each fitting denotes the highest pressure that the stainless steel forged fittings are capable of withstanding. Class 3000 fittings are required for schedule 80/XS pipes, class 6000 fittings for schedule 160 pipes, and class 9000 fittings for XXS pipes with thicker walls. The 300 series of stainless steel grades, including, among others, 304, 304L, 309, 310, 316, 316L, 317L, 321, and 347, generally meet these specifications. After welding, the L-grades provide more corrosion resistance. 304L SS is used in several socket weld steel forged fittings.


Fittings made of stainless steel must adhere to a number of requirements. Forged fittings that fit ASME B36.10 and ASME B36.19 pipes are covered under the B16.11 requirements of the ASME. The material requirements, dimensions, ratings, marking, and tolerances for socket weld forged fittings and threaded forged fittings are included in this specification. Users should use the B16.11 requirements in conjunction with the equipment described in other ASME B16 series volumes. Another specification that pertains to forged pipe fittings is ASTM A182. Forged fittings, forged-or-rolled alloy pipe flanges, stainless steel pipe flanges, valves, and other parts for high-temperature duty are all covered by ASTM A182.


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