Carbon Steel Butt Weld Fittings Manufacturer & Supplier

Q: 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.

Q: Are your butt weld fittings seamless or welded?

Both. Our carbon steel butt weld fittings are shaped from either seamless or fusion-welded carbon steel pipe and plate depending on size and grade - seamless construction is generally preferred for smaller bores and higher-integrity service, while larger sizes are commonly fabricated from welded plate. Specify your preference or leave it to our engineering team to match your project standard.

Q: What end preparation do butt weld fittings come with?

Standard carbon steel weld fittings are supplied with beveled ends per ASME B16.25, ready for a full-penetration field weld to matching pipe. Plain, threaded or flanged end preparations are available on request for specific joint requirements.

Q: Can carbon steel butt weld fittings be used above 400 degrees C?

Standard WPB material is rated for continuous service up to roughly 425 degrees C (800 degrees F), with pressure rating tapering off as temperature rises - see the pressure-temperature relationship on our main Carbon Steel Pipe Fittings page. For higher-temperature or more demanding service, share your design temperature and pressure with our team to confirm the right grade.

Q: Do you supply dual certified WPB/A420 WPL6 fittings?

Yes, dual certification to ASTM A234 WPB and ASTM A420 WPL6 is available on request, giving you flexibility to use the same fitting across both moderate-temperature and low-temperature (down to -46 degrees C) sections of a project, subject to impact-test requirements being met.

Q: What documentation comes with a butt weld fittings order?

Every order includes an EN 10204 3.1 mill test certificate reporting chemical composition, mechanical properties and carbon equivalent as standard. 3.2 third-party certification, dimensional inspection reports, PMI reports and third-party inspection (TUV/BV/DNV/Lloyd's Register) are available on request, along with the commercial invoice, packing list and heat-number traceability needed for customs clearance.

Q: What is the difference between carbon steel weld fittings and forged fittings?

Carbon steel weld fittings (butt weld type) are typically formed from pipe or plate and joined by a full-penetration weld, making them the standard for NPS 2" and above. Forged fittings are machined from solid bar or billet and joined by socket weld or thread, and are used for smaller bore, higher-pressure connections up to NPS 4".

Carbon Steel Butt Weld Fittings Manufacturer and Supplier

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. Our carbon steel weld 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 carbon steel butt weld pipe fittings range serves cross-country pipelines, refinery units and power piping where continuous, leak-tight joints are essential.

What Are Carbon Steel Butt Weld Fittings?

Carbon steel butt weld fittings are pipe fittings with beveled ends designed to be welded directly to matching pipe in a full-penetration weld, rather than joined by a socket, thread or flange. Because the weld fuses fitting and pipe into one continuous wall, this connection type carries the highest pressure integrity of the common end types and is the standard choice for large-bore, high-pressure or continuously operating pipelines.

A useful metallurgical note: carbon steel of this type cannot be hardened by heat treatment in the way alloy or stainless grades can, though it can be work-hardened through cold forming. Where softening or stress relief is needed after fabrication, solution treatment or annealing is carried out by rapid cooling after heating to around 1100 degrees C. This is one reason carbon steel weld fittings are so widely specified, nearly all standard welding processes can be used on them without the distortion risk seen in some higher-alloy grades.

Technical Data

Specifications Chemical Composition Mechanical Properties

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 the MTC

Manufacturing Standards We Work To

Standard	Scope
ASME B16.9	Factory-made wrought buttwelding fittings - elbows, tees, reducers, caps, crosses.
ASME B16.28	Short radius elbows and 180 degree returns.
MSS SP-43	Wrought and fabricated butt-welding fittings for lower-pressure, corrosion-resistant service.
MSS SP-75	High test wrought butt-welding fittings, including WPHY high-yield grades.

See our dedicated pages on Carbon Steel ASME B16.9 Pipe Fittings and Carbon Steel MSS SP-75 Pipe Fittings for standard-specific dimensional and pressure data.

Chemical Composition of Carbon Steel Weld Fittings

Grade	C max	Mn	P max	S max	Si
WPB (A234)	0.30	0.29 – 1.06	0.05	0.058	0.10 min
WPC (A234)	0.35	0.29 – 1.06	0.05	0.058	0.10 min

Mechanical Properties of Carbon Steel Butt Weld Pipe Fittings

Grade	Tensile Strength (MPa)	Yield Strength min (MPa)	Elongation min (%)
WPB	415 – 655	240	22
WPC	485 – 655	275	22

Carbon Steel Butt Weld Elbow Dimensions (ASME B16.9)

Center-to-face and center-to-center dimensions for common ASME B16.9 buttweld elbow sizes, in inches. These are standardized dimensions published in the ASME B16.9 specification and apply across grades (WPB, WPC, WPL, WPHY) for a given size and schedule.

NPS	OD (mm)	90° LR Elbow C-F (in)	90° SR Elbow C-F (in)	45° LR Elbow C-F (in)
1/2	21.3	1 1/2	–	5/8
3/4	26.7	1 1/8	–	7/16
1	33.4	1 1/2	1	7/8
1 1/4	42.2	1 7/8	1 1/4	1
1 1/2	48.3	2 1/4	1 1/2	1 1/8
2	60.3	3	2	1 3/8
2 1/2	73.0	3 3/4	2 1/2	1 3/4
3	88.9	4 1/2	3	2
4	114.3	6	4	2 1/2
5	141.3	7 1/2	5	3 1/8
6	168.3	9	6	3 3/4
8	219.1	12	8	5
10	273.1	15	10	6 1/4
12	323.9	18	12	7 1/2

Carbon Steel Buttweld Elbow & Tee Weight Chart (kg, SCH 40S)

Approximate weights by size for 90° long radius elbow, 45° long radius elbow and equal tee, schedule 40S. Weights scale with schedule, heavier schedules (SCH 80, XS, XXS) will weigh proportionally more than the SCH 40S figures shown here.

NPS	90° LR Elbow (kg)	45° LR Elbow (kg)	Equal Tee (kg)
1/2	0.09	0.04	0.14
1	0.28	0.15	0.38
2	0.85	0.40	1.28
3	1.77	1.08	3.31
4	3.46	2.09	5.27
6	8.07	5.44	10.99
8	15.65	10.77	20.91
12	39.46	29.71	62.14

Full dimension and weight tables across all sizes, schedules and fitting types (tees, reducers, caps, stub ends) are available as a downloadable spec sheet on request, contact our team.

Types of Carbon Steel Butt Weld Fittings

Our carbon steel butt weld pipe fittings range covers every common shape used in pressure piping:

Carbon Steel Tee

Equal tee, reducing tee and lateral tee.

Carbon Steel Stub End

Long and short pattern, for use with lap joint flanges.

Carbon Steel Reducers

Concentric and eccentric reducers.

Carbon Steel Pipe bends

1D, 3D and 5D radius, including 180 degree U-bends, for long-radius directional changes with lower pressure drop.

Carbon Steel End Cap

For terminating a line end.

Carbon Steel Elbows

45 degree, 90 degree and 180 degree return, long radius and short radius.

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.

Butt Weld vs Socket Weld vs Threaded Fittings

Butt weld is one of three common end connections for carbon steel weld 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 about the alternatives: Carbon Steel Socket Weld Fittings and Carbon Steel Threaded Fittings.

Carbon Steel Butt Weld Fittings by Grade and Service Condition

Beyond standard WPB/WPC service, our carbon steel butt weld fittings are also available in grades matched to specific service conditions:

ASTM A234 WPB / WPC / WPA: the base grades for general and higher-temperature moderate service. See ASTM A234 WPB/WPC/WPA Pipe Fittings.
ASTM A420 Low Temperature (WPL3, WPL6, WPL8, WPL9): for service below -29 degrees C, including dual-certified WPB/A420 WPL6 on request. See A420 WPL3, A420 WPL6, A420 WPL8 and A420 WPL9, or our Low Temperature Carbon Steel Fittings overview.
ASTM A860 High Yield (WPHY 42-70): matched to API 5L X-grade line pipe for cross-country pipelines. See WPHY 42, WPHY 46, WPHY 52, WPHY 56, WPHY 65 and WPHY 70, or our High Yield Carbon Steel Pipe Fittings overview.
High Pressure Service: for Class 6000 and above at small bore, or SCH XXS at large bore. See Carbon Steel High Pressure Fittings.

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

Carbon Steel Butt Weld Fittings Price

Carbon Steel Elbow Price List (SCH 40, FOB)

For reference, here is an indicative FOB price list for carbon steel 90° buttweld elbows in SCH 40, long radius and short radius. Prices are per piece, subject to confirmation at time of order, and will vary with schedule, grade, quantity and current raw material rates, treat these as a starting reference, not a binding quote.

90° Elbow — Long Radius

Size (Inch)	SCH 40 Price (USD)	Price (INR â‚¹)
1/2	$16.56	369.51
3/4	$16.56	357.01
1	$16.56	369.51
1 1/4	$16.56	369.51
1 1/2	$16.56	369.51
2	$23.15	516.55
2 1/2	$28.05	625.89
3	$34.24	764.00
4	$56.42	1258.91
5	$121.64	2714.18
6	$124.42	2776.21
8	$234.95	5242.49

90° Elbow — Short Radius

Size (Inch)	SCH 40 Price (USD)	Price (INR â‚¹)
1/2	POA	–
3/4	POA	–
1	$26.57	592.86
1 1/4	$26.57	592.86
1 1/2	$26.57	592.86
2	$35.22	785.87
2 1/2	$56.42	1258.91
3	$66.20	1477.13
4	$86.75	1935.67
5	$257.96	5755.92
6	$229.26	5115.53
8	$379.60	8470.09

POA = Price on Application. Sizes above 8" and other schedules/grades available on request — contact our team for a full quote.

Why Choose Solitaire Overseas for Carbon Steel Weld Fittings

Carbon equivalent control: every heat is checked for CE <= 0.50 and reported on the mill test certificate, so your welding procedure can be qualified with confidence.
Full testing capability: hydrostatic testing, PMI, dye penetrant testing and radiography are available in-house or through accredited third-party labs.
NACE MR0175 / ISO 15156 conformance available on request for sour service projects.
Documentation you can audit: EN 10204 3.1 mill test certificates as standard, with 3.2 third-party certification, TPI witness and dual-grade certification (e.g. WPB/A420 WPL6) available on request.
Export-ready packing: fittings are packed with size, heat number and grade marking intact for full traceability at destination.

Frequently Asked Questions - Carbon Steel Butt Weld Fittings

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?

Both. Our carbon steel butt weld fittings are shaped from either seamless or fusion-welded carbon steel pipe and plate depending on size and grade - seamless construction is generally preferred for smaller bores and higher-integrity service, while larger sizes are commonly fabricated from welded plate. Specify your preference or leave it to our engineering team to match your project standard.

What end preparation do butt weld fittings come with?

Standard carbon steel weld fittings are supplied with beveled ends per ASME B16.25, ready for a full-penetration field weld to matching pipe. Plain, threaded or flanged end preparations are available on request for specific joint requirements.

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

Standard WPB material is rated for continuous service up to roughly 425 degrees C (800 degrees F), with pressure rating tapering off as temperature rises - see the pressure-temperature relationship on our main Carbon Steel Pipe Fittings page. For higher-temperature or more demanding service, share your design temperature and pressure with our team to confirm the right grade.

Do you supply dual certified WPB/A420 WPL6 fittings?

Yes, dual certification to ASTM A234 WPB and ASTM A420 WPL6 is available on request, giving you flexibility to use the same fitting across both moderate-temperature and low-temperature (down to -46 degrees C) sections of a project, subject to impact-test requirements being met.

What documentation comes with a butt weld fittings order?

Every order includes an EN 10204 3.1 mill test certificate reporting chemical composition, mechanical properties and carbon equivalent as standard. 3.2 third-party certification, dimensional inspection reports, PMI reports and third-party inspection (TUV/BV/DNV/Lloyd's Register) are available on request, along with the commercial invoice, packing list and heat-number traceability needed for customs clearance.

What is the difference between carbon steel weld fittings and forged fittings?

Carbon steel weld fittings (butt weld type) are typically formed from pipe or plate and joined by a full-penetration weld, making them the standard for NPS 2" and above. Forged fittings are machined from solid bar or billet and joined by socket weld or thread, and are used for smaller bore, higher-pressure connections up to NPS 4".