MSS SP-83 Socket Welding and Threaded Steel Pipe Unions Manufacturers – ASTM A105, ASTM A182 F304, F316, F304L, F316L, and A182 F5, F9, F11, F22, F91

  • Size: from 1/8″ NPS TO 3″ NPS, Pressure Rating: 3000LB, 6000LB (SCH80/XS,SCH160), Thread: NPT, NPSC, BSPT, BSPP, Type: Male and Female
  • Types of Unions – Socket Weld Union, Threaded Union, Male x Female Threaded Union, Socket Weld x Female Threaded Union, Butt Weld Union, Lug Nut Union

Metallica is a well known manufacturer and supplier of MSS SP-83 socket welding and threaded steel pipe unions for the clients from oil and gas, petrochemicals, railway, construction and other industries. We manufacture different size and shapes of unions by closed die forging. Our main products include socket weld fittings and threaded fittings in size range of 1/4″ to 4″ (6mm-100mm), with pressure rating of 2000LBS, 3000LBS, 6000LBS, and 9000LBS. The most common and materials include ASTM A105, ASTM A182 F304, F316, F304L, F316L, and A182 F5/F9/F11/F22/F91. In nickel alloys we manufacturing forged union pipe fittings in various grades such as Alloy 200, 201, 400, K500, 600, 625, 800H/HT, 825, X-750, C276, Hastelloy B & C22.

Forged Socket Weld & Threaded Pipe Fittings Manufacturing Standards

  • ASTM A182 – ASME SA182 – Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
  • ASME B16.9 – Factory-Made Wrought Buttwelding Fittings
  • ASME B16.11 – Socket Welding and Threaded Forged Fittings
  • MSS SP-43 – Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications
  • MSS SP-95 – Swage(d) Nipples and Bull Plugs
  • BS3799 – Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry
  • MSS SP-83 – Socket Welding and Threaded Steel Pipe Unions

Socket weld and threaded fittings are generally used for small size pipes and piping systems (generally below 4 inches in diameter for Class 3000, and below 2 inches for fittings in class 6000 and 9000). Forged pipe fittings are manufactured by forging, followed by heat treatment and machining solid steel as per the dimensional standards. For bigger size piping systems buttweld pipe fittings produced as per ASME B16.9 are used.

Production Range of Steel Pipe Unions

Product Union
Connection Socket Weld, Threaded
Size 1/8″ NPS TO 3″ NPS
Pressure Rating 3000LB, 6000LB, 9000LB (SCH80/XS,SCH160,XXS)
Process method Forged, CNC Machined
Standards: MSS SP 83
Certification EN 10204 3.1
  • Thread: NPT, NPSC, BSPT, BSPP, Type: Male and Female
  • MS SP-83 contains dimensionals, finish, tolerances, testing, marking, material, and minimum performance requirements for forged carbon and stainless steel pipe unions, socket welding and threaded ends.

Steel Pipe Union Materials & Grades

Carbon Steel ASTM A105/N, ASTM A350LF2, LF3, LF6
Duplex 2205(F51/60), 2507(F53)
Chrome Moly SA182, F1, F5, F5a, F9, F9l, F11, F12, F22
Stainless Steel 304/L/H, 316/L/H, 310, 317L, 321/H, 347/H, 410, 416, 420, 17-4, 440, Alloy 20
Nickel Alloys 200, 201, 400, K500, 600, 625, 800H/HT, 825, X-750, C276, Hastelloy B & C22

Pressure & Temperature Service Rating for Class 3000 Carbon and Stainless Steel Unions Socket Welding & Threaded Ends

SERVICE NON一SHOCK WORKING PRESSURE (PSI)
TEMP
DEGREE °F ASTM A105 Carbon Steel ASTM A182 F316 Stainless Steel ASTM A182 F304L F316L Stainless Steel ASTM A182 F304L Stainless Steel
100 3000 2915 2430 2915
200 2735 2510 2050 2430
300 2655 2265 1835 2140
400 2565 2080 1670 1905
500 2425 1935 1545 1770
600 2220 1830 1460 1680
650 2180 1800 1420 1650
700 2155 1750 1390 1630
750 1710 1360 1610
800 1680 1330 1595
850 1645 1300 1575
900 1595 1555
950 1565 1515
1000 1470 1300

Manufacturing Process for Forged Socket Weld & Threaded Pipe Fittings

  • Forged fittings are the fittings made by forged steel. The process of manufacturing forged steel fittings include: cutting and heating billets, put pressure on heated billets under dies into desired shape, trimming and shot blasting. Then machine forged blank fittings for net shape and dimensions. According to the applications of forged steel fittings, they are available in threaded and socket weld end connections.
  • The main raw material for producing forged pipe fittings is round bar stock or billets.
  • Most of the forged steel fittings are not large, so closed die forging is normally adapted to produce forged steel fittings. Compared to the open die forging, the close die forging can achieve more complex geometries, very much close to the dimensions of the finished component.
  • Close die forging can produce forged fittings in all materials such as carbon steel, duplex, stainless steel or nickel alloys.

Types of Socket Welded & Threaded Forged Steel Pipe Fittings

  1. Elbows (90 Degree Elbows and 45 Degree Elbows) – A pipe elbow is a forged steel fitting installed between two lengths of pipe or tube allowing a change of direction, usually in the 90° or 45° direction. Similar to a reducing tee, reducing elbows also exist to simultaneously change flow direction and reduce flow diameter. Street Elbows have one female end to accept pipe and another male end thread that is the same size as the pipe and can avoid the use of a pipe nipple during installation.
  2. Tees (Equal Tee and Reducing Tees)- Tees are a type of forged steel fitting used to combine or divide process flow, and Reducing Tees additionally allow for pipe size change. The run outlets of the tee are the two in-line outlets, and the branch is the third outlet. The branch outlet is the reducing outlet in a reducing tee.
  3. Couplings (Straight and Reducing Couplings, Full and Half Couplings) – Couplings are a forged steel fitting used to connect two lengths of pipe, and Half-coupling is screwed onto the pipe, while the other end is made to be tightly inserted, or welded, onto the other end to pipe or vessel. Standard Couplings have female threads or open sockets at both ends, whereas reducing couplings connect smaller pipes to larger ones.
  4. Unions– Unions are a forged steel fitting similar to a coupling but allow a convenient disconnection and connection; it has 3 parts: a nut, a female end, and a male end. They allow two lengths of pipe to be assembled and detached without causing any deformation to the pipes.
  5. Bushings (Hex Head Bushings and Flush Bushings) – Reducing inserts and Bushings are forged steel fittings that allow for a change in pipe size. Pictured here is the hex head bushing, which is most commonly used.
  6. Caps (Pipe Caps and End Caps) – Caps are forged steel fittings used to terminate the flow, inserting over the end of the pipe.
  7. Plug (Square Head Plugs, Hex Head Plugs and Round Head Plugs) – Similar to a cap, plugs are forged steel fittings that are inserted into the end of the pipe, and they come with different head types, including: hex, square, and round.
  8. Cross – Crosses are a 4-way forged steel fitting, with 1 inlet and 3 outlets or vice versa. These are sometimes referred to as 4-way tees.
  9. Outlets (Weldolets, Sockolets, Threadolets, Elbolets, Latrolets and Nipolets)
  10. Nipples (Hexagonal Nipples and Swaged Nipples)