Carbon Steel Butt Weld Fittings Manufacturer & Exporter

As a dedicated carbon steel butt weld fittings manufacturer, Solitaire Overseas produces elbows, tees, reducers, caps and crosses in ASTM A234 Grade WPB and WPC, built to ASME B16.9 dimensions for beveled, weld ready joints. Fittings are shaped from seamless or fusion welded carbon steel pipe and plate, then normalized and inspected to control the carbon equivalent for reliable field welding. Covering NPS 1/2 inch to 48 inch and schedules from 10 through XXS, our butt weld range serves cross country pipelines, refinery units and power piping where continuous, leak tight joints are essential.

Technical Data

Specifications Chemical Composition Mechanical Properties Wall Thickness / Schedule Guide

Carbon Steel Butt Weld Fittings Specifications

Parameter	Specification
Standard	ASTM A234 Grade WPB / WPC
Dimensional Standard	ASME B16.9, ASME B16.28, MSS SP-43
Size Range	NPS 1/2" to 48"
Wall Thickness	SCH 10, SCH 20, SCH 40/STD, SCH 80/XS, SCH 160, XXS
End Type	Beveled for butt welding; plain, threaded or flanged ends on request
Construction	Seamless or fusion welded, from pipe or plate
Heat Treatment	Normalized, or hot formed and air cooled per ASTM A234
Carbon Equivalent	CE ≤ 0.50 [C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15], reported on MTC

Chemical Composition (%)

Grade	C max	Mn	P max	S max	Si min
WPB	0.30	0.29 – 1.06	0.05	0.058	0.10
WPC	0.35	0.29 – 1.06	0.05	0.058	0.10

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength min (MPa)	Elongation min (%)
WPB	415 – 655	240	22 (17 for plate-made fittings)
WPC	485 – 655	275	22 (17 for plate-made fittings)

Wall Thickness / Schedule Guide

Schedule Designation	Typical Duty
SCH 40 / STD	General service, moderate pressure
SCH 80 / XS	Higher pressure service
SCH 160	High pressure service
XXS	Maximum wall thickness, highest pressure duty

Types of Carbon Steel Butt Weld Fittings

Carbon Steel 45 Degree Elbow	Carbon Steel 45 Degree Elbow Carbon Steel Buttweld 45 Deg. Elbow CS 45 Degree Elbow ASME A234 Carbon Steel 90 Degree Elbow
Carbon Steel Pipe Fittings	Carbon Steel Pipe Fittings Carbon Buttweld Fitting CS Pipe Fitting CS Buttweld Fitting ASTM A234 Carbon Steel Buttweld Fitting
Carbon Steel Eccentric Reducer	Carbon Steel WPB Eccentric Reducer Carbon Steel Eccentric Reducer CS WPB Eccentric Reducer CS Eccentric Reducer ASTM A234 Carbon Steel Eccentric Reducer
Carbon Steel Concentric Reducer	Carbon Steel Concentric Reducer CS Concentric Reducer Carbon Steel WPB Concentric Reducer ANSI B16.9 Carbon Steel A234 Concentric Reducer
Carbon Steel Lateral Tee	Carbon Steel Lateral Tee CS Lateral Tee Carbon Steel WPB Lateral Tee ASME SA234 Carbon Steel Lateral Tee
Carbon Steel Equal Tee	Carbon Steel Equal Tee CS Equal Tee Carbon Steel WPB Equal Tee CS WPB Equal Tee ASTM A234 Carbon Steel Equal Tee
Carbon Steel Long Stub End	Carbon Steel Long Stub End CS Long Stub End Carbon Steel WPB Long Stub End ASTM A234 Carbon Steel Long Stub End
Carbon Steel Short Stub End	Carbon Steel Short Stub End CS Short Stub End Carbon Steel WPB Short Stub End ASTM A234 Carbon Steel Short Stub End MSS-SP-43 Carbon Steel Short Stub End
Carbon Steel End Cap	Carbon Steel End Cap Carbon Steel WPB End Cap CS End Cap ASTM A234 Carbon Steel End Cap
Carbon Steel Bend	Carbon Steel Pipe Bend Carbon Steel 1D Bend Carbon Steel 5D Bend CS Pipe Bend Carbon Steel 180D Bend ASTM A234 Carbon Steel U Bend
Carbon Steel Equal Cross	Carbon Steel Equal Cross CS Equal Cross Carbon Steel WPB A234 Equal Cross ANSI A234 Carbon Steel Equal Cross

Need the forged small bore counterpart to these fittings?

Explore our Carbon Steel Forged Fittings range, or contact our team to confirm the right combination for your piping class.

Applications of Carbon Steel Butt Weld Fittings

Refinery and petrochemical process piping
Cross country oil and gas pipelines
Thermal, nuclear and combined cycle power plant steam and water lines
Fertilizer and chemical plant piping
Marine and offshore piping systems

Butt Weld vs Socket Weld vs Threaded Fittings

Butt weld is one of three common end connections for carbon steel pipe fittings. Here is how the three compare.

Feature	Butt Weld	Socket Weld	Threaded
Typical Size Range	NPS 1/2" to 48"	NPS 1/8" to 4"	NPS 1/8" to 4"
Joint Type	Full penetration weld	Fillet weld into socket	Mechanical thread (NPT/BSPT)
Pressure Capability	High, size dependent	Up to Class 9000	Up to Class 6000
Leak Tightness	Highest, continuous weld	High	Lower, thread sealant dependent
Best Suited For	Large bore continuous pipelines	Small bore welded systems	Small bore, frequently dismantled joints
Learn More	This page	Carbon Steel Socket Weld Fittings	Carbon Steel Threaded Fittings

Frequently Asked Questions

What is the difference between ASTM A234 WPB and WPC?

WPB has a lower carbon maximum (0.30%) and lower tensile strength (415 to 655 MPa) than WPC (0.35% carbon, 485 to 655 MPa), making WPC suitable for slightly higher stress duty within the same grade family.

Are your butt weld fittings seamless or welded?

We supply both. Seamless butt weld fittings are shaped from seamless pipe, while welded (ERW/EFW) construction fittings are made from fusion welded pipe or plate; both routes are covered under ASTM A234.

What end preparation do butt weld fittings come with?

Standard fittings are supplied with beveled ends ready for field welding per ASME B16.25. Square or custom bevel ends can be arranged on request.

Can carbon steel butt weld fittings be used above 400°C?

ASTM A234 WPB/WPC fittings suit moderate and high temperature service, but sustained use above roughly 425°C to 480°C risks graphitization; for higher temperatures, alloy grades such as WP11 or WP22 are recommended instead.

Do you supply dual certified WPB/A420 WPL6 fittings?

Dual certified fittings meeting both WPB and low temperature WPL6 requirements can be supplied on request; specify your minimum design metal temperature when ordering.

What documentation comes with a butt weld fittings order?

Each order ships with an EN 10204 3.1 mill test certificate covering chemical analysis and mechanical test results; 3.2 third party certification and radiography reports are available on request.