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Socket Weld and Threaded Fittings (ASME B16.11)

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How to define forged fittings? The term “forged fittings” refers to two families of pipe fittings (socket weld and threaded) used for small bore pipes and piping systems (generally below 4 inches in diameter for Class 3000, and below 2 inches for fittings in class 6000 and 9000). These fittings are manufactured by forging and machining solid steel and are available in a multitude of shapes like elbows, tees, reducers, unions, couplings. The ASME B16.11 specification covers socket and threaded fittings for oil and gas application. For larger pipe sizes, ASME B16.9 buttweld fittings shall be used instead.

FORGED FITTINGS ASME B16.11

Forged vs. Buttweld Fittings

Forged fittings are used for piping systems below 2 or 4 inches in diameter (4″ for 2000#/3000# fittings, 2″ for  6000#/9000# fittings), whereas buttweld fittings are used for larger diameter piping.

The two main types of forged fittings are the so-called socket weld fittings (which are connected to pipes by fillet welds) and threaded fittings (the pipe is screwed onto the fitting).

The ASME B16.11, MSS SP 75, MSS SP 83, MSS SP 95 specifications cover forged fittings (socket weld and threaded) to fit ASME B36.10 and ASME B36.19 carbon, alloy, stainless steel and nickel alloy pipes of small bore size.

Forged fittings are manufactured from solid blocks of steel, that are machined to obtain the final required shape within the tolerances set by the applicable specifications mentioned above. This is different from buttweld fittings, which are manufactured by cutting, bending and shaping seamless or welded steel pipes.

 

 

Forged fittings asme b16.11

 

Forged Fittings Types

Socket weld and threaded fittings are available in multiple shapes (elbows, tees, caps, adapters, couplings, etc), sizes (bore sizes between 1/8 and 4 inches, and ratings as 2000#, 3000#, 6000#, 9000#) and material grades (the most common are ASTM A105, ASTM A350 LF1/2/3/6 for low-temperatures, ASTM 182 for corrosive, high-temperature applications). The class of the fitting represents the maximum allowed pressure that the device can withstand.

Class 3000 fittings are used for pipes in schedule 80/XS; Class 6000 for pipes Sch. 160; Class 9000 fittings for pipes with larger wall thickness (XXS).

Forged Elbow 45/90 Degrees

Forged elbows are used to change the direction of the piping system by 45 or 90 degrees. Forged elbows are manufactured according to ASME B16.11 in various material grades, either with socket weld or threaded pipe connections. A special type is the so-called “street elbow”.

Forged Street Elbow ASME B16.11
Forged elbows 45 and 90 degrees, street elbow.

Forged Tee (Equal/Reducing)

Forged tees are used to branch a pipe at 90 degrees. Tees can be straight (equal) or reducing.

Forged tees ASME B16.11 are available with socket weld or threaded connections (NPT or BSP). The dimensions of forged tees are covered by the MSS SP 75 and the ASME B16.11 specifications.

 

Forged Tee ASME B16.11

 

Forged Lateral

Forged laterals feature a Y shape and are used to branch a pipe at 30-degrees (or different angles, according to the piping specifications).

Forged Lateral

Forged Plug (Round, Squared, Hex)

Forged plugs are available with a round, squared or hexagonal head and are used to blind pipes.
Pipe Plug Forged

Bushings

Hexagonal bushings are manufactured in accordance with ASME B16.11 and are used to join two threaded items of a different size.

Hexagonal Bushings ASME B16.11

Couplings (Half, Full)

Couplings are forged fittings manufactured in accordance with ASME B16.11 and are used to join pipes.

They are available in half or full size and with socket weld or threaded connections (or a combination of the two for special piping applications).

Forged Coupling, Half and Full

Reducers and Reducer Inserts

Reducers are available in two main types, called 1 and 2. They are used to connect pipes and reduce the bore size.

Forged Reducer and Reducer Insert

Union

Unions are available in the male to female, female to female types, lug nut, and Rockwood design. Unions comply with the MSS SP 83 standard.

Forged Union MSS SP 83

Welding Boss

Welding Boss

SOCKET WELD VS. THREADED FITTINGS

ASME B16.11 forged fittings are available with two types of end connections, which are called “socket weld” and “threaded” (shown in the picture).

Difference between socket weld and threaded fittings

SOCKET WELD FITTINGS

Socket weld fittings are connected to pipes by fillet welds, whereas threaded fittings are screwed onto the pipe (or vice-versa).
A socket weld fitting (left side) and a threaded fitting (right side).

Socket weld and threaded pipe fittings types

Socket weld fittings are used for applications where strong and long-lasting connections are required.  Socket weld fittings are very reliable but are time-consuming to install in a piping system (due to the heavy workload caused by welding operations on small parts).

Socket weld fittings are available in sizes from 1/8 to 4 inches and in classes between 2000# and 9000#.

The typical applications for socket weld fittings are:

  • Steam
  • Explosive fluids and gases
  • Acids and toxic fluids
  • Long service / durable installations

Socket weld and weld fittings connection

Fillet weld vs. Butt Weld: a butt welding connection fills the gaps between two devices, that are beveled at 30 degrees.

THREADED FITTINGS

Threaded fittings are used for less-critical piping systems, such as water distribution, fire protection, and cooling, or for low-pressure installations not subject to vibration, elongation and bending forces. Threaded pipe fittings are not suited for fluids with constantly changing temperatures, as sudden changes may crack the connection.

Taper threaded fittings connection

The two major types of threads are the BSP and NPT, which are not compatible one with the other:

BSP Fittings

BSP means “British Standard Pipe” and can be further divided into the BSPT (tapered) and BSPP (parallel) variations. The threads have a 55° angle in this case. BSP threaded fittings are less common than NPT threaded fittings in the oil and gas industry


NPT Fittings

NPT stands for “National Pipe Tapered” and is the dominant standard for threaded forged fittings in the oil and gas industry. NPT threading is covered by the ASME B1.20.1 specification and is based on 60° thread flank angles (vs. 55° of the BSP type).

BSP vs NPT thread fittings
BSP (BSPP/BSPT) vs NPT: thread angle 55 vs 60 Deg.

FORGED FITTINGS MATERIALS

Carbon steel fittings ASTM A105 (forged)

A105 socket weld and threaded fittings match carbon steel pipes for high-temperature services, like ASTM A53, A106 and API 5L. For low-temperature service, ASTM A350 socket/threaded fittings shall be used instead (to match ASTM A333 pipes).

A105 Forged Fittings Materials, Chemical Composition %

Material GradeGrade or ClassCSiMnSPCuNiCrMoVCb/Nb
ASTM A1050.350.10-0.350.60-1.050.040.0350.40.40.30.120.08
ASTM A181600.350.10-0.351.10.050.05
700.350.10-0.351.10.050.05
ASTM A26610.30.15-0.350.40-1.050.0250.025
20.30.15-0.350.40-1.050.0250.025
30.350.15-0.350.80-1.350.0250.025
40.30.15-0.350.80-1.350.0250.025
ASTM A350LF10.30.15-0.300.60-1.350.040.0350.40.40.30.120.080.02
LF2-10.30.15-0.300.60-1.350.040.0350.40.40.30.120.080.02
LF2-20.30.15-0.300.60-1.350.040.0350.40.40.30.120.080.02
LF3-10.20.20-0.350.90.040.0350.43.30-3.700.30.120.030.02
LF3-20.20.20-0.350.90.040.0350.43.30-3.700.30.120.030.02
LF5-10.30.20-0.350.60-1.350.040.0350.41.00-2.000.30.120.030.02
LF5-20.30.20-0.350.60-1.350.040.0350.41.00-2.000.30.120.030.02
LF6-10.220.15-0.301.15-1.500.0250.0250.40.40.30.120.04-0.110.02
LF6-20.220.15-0.301.15-1.500.0250.0250.40.40.30.120.04-0.110.02
LF6-30.220.15-0.301.15-1.500.0250.0250.40.40.30.120.04-0.110.02
LF90.20.40-1.060.040.0350.75-1.251.60-2.240.30.120.030.02
LF787-20.070.40.40-0.700.0250.0251.00-1.300.70-1.000.60-0.900.15-0.250.030.02 min
LF787-30.070.40.40-0.700.0250.0251.00-1.300.70-1.000.60-0.900.15-0.250.030.02 min

A105 Forged Fittings, Mechanical Properties

Material GradeGrade or ClassTensile Strength min, KsiYield Strength
Ksi @ 0.2%
Elongation in 2 in, %
ASTM A105703622
ASTM A18160603022
70703618
ASTM A266160-853023
270-953620
370-953620
475-10037.519
ASTM A350LF160-853025
LF2-170-953622
LF2-270-953622
LF3-170-9537.522
LF3-270-9537.522
LF5-160-853025
LF5-270-9537.522
LF6-166-915222
LF6-275-1006020
LF6-375-1006020
LF963-884625
LF787-265-855520
LF787-375-956520

Low-alloy steel fittings ASTM A182 (forged)

Low-alloy forged fittings match chrome-moly pipes ASTM A335 in grades P5 (for F5 fitting), P9 (for F9 fitting), P11 (for F11 fitting), P22 (for F22 fitting), P91 (for F91 fittings). The chemical composition of these common alloy grades for socket weld and threaded fittings is shown below:

Low-Alloy Forged Fittings Materials A182 F5 A182 F9 A182 F11 A182 F22 A182 F91
C 0.15 Max 0.15 Max 0.10-0.20 (2) 0.05-0.15 0.08-0.12
Mn 0.30-0.60 0.30-0.60 0.40-0.65 0.30-0.60 0.30-0.60
P 0.035 Max 0.030 Max 0.025 Max 0.035 Max 0.020 Max
S 0.030 Max 0.030 Max 0.040 Max 0.040 Max 0.010 Max
Si 0.50 Max 0.50-1.00 0.50-0.80 0.50 Max 0.20-0.50
Ni 0.50 Max 0.40 Max
Cr 4.0-6.0 8.0-10.0 1.00-1.50 2.00-2.50 8.0-9.5
Mo 0.44-0.65 0.90-1.10 0.44-0.65 0.90-1.10 0.85-1.05
V 0.18-0.25
Cu
Other Cb, 0.06-0.10; N, 0.03-0.07; Al, 0.04 max.

Stainless steel fittings ASTM A182 (forged)

Stainless steel forged fittings match ASTM A312 pipes. The chemical composition of stainless steel socket weld and threaded fittings is given below:

ASTM A182 Forged Fittings Materials in %
A182 Grade C Mn P S Si Ni Cr Mo Nb Ti Others
F304(1) 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
F304H 0.04-0.10 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
F304L(1) 0.030 2.0 0.045 0.030 1.0 8.0-13.0 18.0-20.0
F304N(2) 0.08 2.0 0.045 0.030 1.0 8.0-10.5 18.0-20.0
F304LN(2) 0.030 2.0 0.045 0.030 1.0 8.0-10.5 18.0-20.0
F309H 0.04-0.10 2.0 0.045 0.030 1.0 12.0-15.0 22.0-24.0
F310 0.25 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0
F310H 0.04-0.10 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0
F310MoLN 0.030 2.0 0.030 0.015 0.40 21.0-23.0 24.0-26.0 2.0-3.0 N 0.10-0.16
F316 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0
F316H 0.04-0.10 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0
F316L(1) 0.030 2.0 0.045 0.030 1.0 10.0-15.0 16.0-18.0 2.0-3.0
F316N(2) 0.08 2.0 0.045 0.030 1.0 11.0-14.0 16.0-18.0 2.0-3.0
F316LN(2) 0.030 2.0 0.045 0.030 1.0 11.0-14.0 16.0-18.0 2.0-3.0
F316Ti 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0 (3) N 0.10 max
F317 0.08 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
F317L 0.030 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
F321 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (4)
F321H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (5)
F347 0.08 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (6)
F347H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (7)
F348 0.08 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (6) Co 0.20
Ta 0.10
F348H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (7) Co 0.20
Ta 0.10

Socket weld fittings are available, also, in other grades as duplex and super duplex (ASTM A182 F51, F53/F55) and various nickel-alloys (Inconel, Incoloy, Monel, Hastelloy).

FORGED FITTINGS MANUFACTURERS

10 Responses

  1. Hi , I’m looking for the following prices . 25mm threaded socket working pressure 10bar and threaded 25mm nipples all carbon steel .

    1. Hi,

      I have used threaded fittings for steam network then found later that this type of fittings is not reliable for steam application so I have decided to weld around the fittings.

      Is this OK?

  2. Dear Sirs,

    For a special application I am looking for one(1) piece of:

    Y-Filter,socket weld,1/2”,B16.11 with IPS thread delivered Istanbul-Turkey.

    my best regards,

    Nejat Uner Istanbul-Turkey

  3. Dear Sir,

    Greetings.
    Please quote your best price and delivery time for the below item:

    SK2022030303 – 30 DAYS VALIDITY REQUIRED – LOWEST OFFER TO BE QUOTED – AS PER QP AML – BCD : 07/03/2022

    Note
    1) Quoted items should be exactly as per specification. If any deviation to be highlighted separately.
    2) MTC 3.1 only required.
    3) Sea worthy packing cost & attested shipping document cost to be quoted separately.
    4) Manufacturer name and origin to be mentioned against each line items
    5) Ex-work packed basis quote required.
    6) All pipes / fittings / flanges / plates shall be manufactured within 5 years prior to collection or delivery
    7) Please provide catalogue / datasheet for the item to be quoted.
    8) As per QP AML

    Material Description:

    00002 10096734 QTY: 30 Piece 24.MAR.2022
    NIPPLE,PIPE,HEX,1/4IN,MI,GALV,,
    NIPPLE,PIPE
    SH_NAME NIPPLE,PIPE
    NIPPLE_TYPE HEX
    NIPPLE_DIMENSIONS 1/4IN
    NIPPLE_MATL MI
    NIPPLE_FINISH GALV
    NIPPLE_PRESS_RTG 25 BAR AT -20 TO 120 DEGC
    NIPPLE_CONN_DATA NPT-M EQUAL
    NIPPLE_INSPECTION_CERT ISO 10474-2.1
    NIPPLE_DESIGN_SPEC BS 143
    NIPPLE_MATL_SPEC ASTM A197M
    NIPPLE_COATING_SPEC ASTM A153 CL A
    Inspection text
    Certificate of Compliance BS EN 10204 / ISO 10474 type 2.1

    Your offer the earliest is highly appreciated. Waiting for your prompt reply.

    Thanks & Regards,
    Heinlyn
    Inside Sales Representive – Oil & Gas Division

    BECON TRADING & CONTRACTING W.L.L
    Building No: 94, D-Ring Road, Street-250, Zone 42, Al-Hilal Area,
    PO Box #37312, Doha, Qatar
    [email protected]

  4. Dear Sir/Madam,

    Yancheng Xinfujit Machinery Co.,Ltd. is a manufacturer specialized in hydraulic flange and fittings for a variety of
    hose,pipe and tube assemblies,The products widely used in petrol, the chemiacal industry, construction machinery and equipment.
    Support for the hydraulic piping system.

    Our Product group of SAE Flange including:
    SAE Split flanges
    SAE flange clamps
    SAE weld flanges
    SAE Butt weld flanges
    SAE socket weld flanges
    SAE socket weld elbow flanges
    SAE threaded flanges/SAE threaded counter flanges
    SAE BSPP threaded flanges
    SAE NPT threaded flanges
    SAE closed flanges/SAE Blind flanges
    SAE blocks

    All the above products of SAE flanges come in two main series
    3000 psi standard pressure series, designed according to standard ISO 6162-1, this is also called code 61 flanges
    6000 psi high pressure series, designed according to standard ISO 6162-2, this is also called code 62 flanges.

    Materials of SAE hydraulic flanges
    Carbon steel:C45,C20,CQ235 or on requests.
    Stainless steel:304,304L,316 and 316L or equivalent EN/DIN stainless steel grades,used for connecting stainless steel hydraulic tubing.
    other materials also can be supplied on request with some required min. order quantity.

    Our products export to more than 30 countries, and get well reputation.
    We have our own export licence. We are looking forward to cooperating with you sincerely.

    Looking forward to hearing from you.
    Best regards
    Eileen Jia

    Yancheng Xinfujit Machinery Co.,Ltd.
    Mobile:00 86 18262378752(wechat)
    Fax:00 86 515 86523666
    Contact person:Eileen Jia
    Website: https://xfjt168.en.alibaba.com/
    E-mail:[email protected]
    Address:No.8 2# Road Private Industrial Park Jianhu County,
    Yancheng city,Jiangsu Province,China.

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