What is a Buttweld Fitting?

A buttweld fitting is a weldable pipe fitting that allows for change of direction of flow, to branch off, reduce pipe size or attach auxiliary equipment. Forged Steel buttweld fittings are manufactured in accordance with ANSI / ASME B16.9.

Butt weld fittings are available as elbows, tees, caps, cross, reducers bend etc. These fittings are the most common type of welded pipe fitting and are specified by nominal pipe size and pipe schedule. Buttweld fittings use seamless or welded pipe as the starting material and are formed (through multiple processes) to get the shape of elbows, tees and reducers etc. Just as the pipe is sold from Schedule 10 to Schedule 160, butt weld pipe fittings are sold the same way. Welded butt weld fittings are more common in stainless steel due to cost advantage. Sch. 10 fittings are also more common in stainless steel butt weld fitting.

 

Types of Buttweld Pipe Fittings

Buttweld Elbow

Buttweld Tee

Buttweld Cross

 

Buttweld Reducer

Buttweld Stub End

Buttweld Bend

 

Pipe Caps

Hose Nipple

 

 

Standard Specification for Buttweld Fittings

Standards :	ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Size :	6NB to 2400NB
Thickness :	Sch 5s, Sch 10, Sch 10s, Sch 20, Sch 40, Sch 40s, Sch 60, Sch 80, Sch 80s, Sch XS, Sch 100, Sch 120, Sch 140 Sch 160s, Sch XXS etc
Forms :	Seamless, Welded & Fabricated
Bending Radius :	R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom

 

Material of Construction in Buttweld Fittings

  Stainless Steel Buttweld Fitting Specifications

Grades: ASTM A403 / ASME SA403 GR. WP “S” / “W” / “WX” 304, 304L, 304H, 310/310S, 316, 316L, 316H, 316TI, 309, 317, 317L, 321, 321H, 347, 347H, 904L, 254SMO etc

  Duplex Stainless Steel Buttweld Fitting Specifications

Grades: ASTM A815 / ASME SA815 GR. 2205 (UNS S31803 / UNS S32205), 2507 (UNS S32750 / UNS S32760), Fe 255 (UNS S32550) etc

  Carbon Steel Buttweld Fitting Specifications

Grades: ASTM A234 / A420/ A860 / ASME SA234 GR. WPB, WPL-3, WPL-6, IS 1239, IS 3589, WPHY42, WPHY46, WPHY52, WPHY60, WPHY65, WPHY70, etc

  Alloy Steel Buttweld Fitting Specifications

Grades: ASTM A335/ ASME SA335 WP 5, WP 9, WP 11, WP 12, WP 22, WP 91, etc

  Nickel Alloy Buttweld Fitting Specifications

Grades: ASTM B366 / ASME SB366 GR. 200 (WPN, N02200), 201 (WPNL, N02201), Alloy 20 (WP20CB, N08020), etc

  Monel Buttweld Fitting Specifications

Grades: ASTM B366 / ASME SB366 GR. 400 (WPNC, N04400), 500 (N05500), etc

  Inconel / Incoloy Buttweld Fitting Specifications

Grades: ASTM B366 / ASME SB366 GR. 600 (WPNCI, N06600), 601 (N06601), 625 (WPNCMC, N06625), 718 (N07718), 800 (WPNIC, N08800), 800H (WPNIC10, N08810), 800HT (WPNIC11, N08811), 825 (WPNICMC, N08825), 904L (N08904)

  Hastelloy Buttweld Fitting Specifications

Grades: ASTM B366 / ASME SB366 GR. C726 (WPHC276, N10276), C4 (WPHC4, N06455), C22 (WPHC22, N06022), C2000 (WPHC2000, N06200), X (WPHX, N06002), B2 (WPHB-2, N10665), B3 (WPHB-3, N10675)

  Titanium Buttweld Fitting Specifications

Grades: GR 2/ WPT2, Gr 5/ WPT5 (Ti6AI4V), GR 7/WPT7.

  Copper & Copper Alloy Buttweld Fitting Specifications.

Grades: ASTM B466, B467 Copper Nickel 90/10 (C70600), Copper Nickel 70/30 (C71500), UNS C71640, Commercial, ETP, OFE, Brass, Naval Brass, Aluminium Bronze, Admiralty Brass.