Carbon Steel Pipe Fittings Manufacturer & Exporter

Carbon Steel Pipe Fittings Manufacturer, Exporter and Supplier

Solitaire Overseas is a specialist carbon steel pipe fittings manufacturer and exporter, supplying pressure-piping components for oil and gas, petrochemical, power generation, shipbuilding and water infrastructure projects. Our extensive collection of carbon steel fittings includes butt weld, forged, socket weld and threaded fittings in ASTM A234 WPB/WPC and ASTM A105 pressure and strength grades ranging from NPS 1/8" to 48" and from pressure classes 150# to 9000#. Mill test certificates, third party inspection support and complete dimensional traceability of elbows, tees, reducers, caps, couplings and small bore fittings from one reliable source – that's the back-up you receive with every consignment we ship to you, whether you are using us as a stockist or a fabricator or are one of our established EPC contractors.

Whether you need a large-bore butt weld elbow for a cross-country pipeline or a small-bore forged coupling for an instrumentation line, our team of carbon steel pipe fittings suppliers will match the right product, grade and finish to your project specification. Browse our related Carbon Steel Pipes and Carbon Steel Tubes ranges to complete your piping system in a single order.

What Are Carbon Steel Pipe Fittings?

Carbon steel pipe fittings are piping components manufactured from steel in which carbon is the primary alloying element alongside iron, giving the material its characteristic strength, hardness and weldability. Fittings such as elbows, tees, reducers, caps and couplings are used wherever a pipeline needs to change direction, branch, change size or terminate, and they are manufactured as carbon steel fittings in either butt weld, forged, socket weld or threaded form depending on the line size, pressure class and type of joint required.

Because carbon steel combines high tensile strength with good ductility and ease of fabrication at a comparatively low cost, it remains one of the most widely specified materials for pressure piping across oil and gas, petrochemical, power and water infrastructure projects. Buttweld carbon steel pipe fittings in particular are valued for the strong, leak-tight, fully welded joints they create when fused to matching pipe, which is why they dominate large-bore process piping where a mechanical or threaded connection would not hold up under continuous pressure and thermal cycling.

Carbon Steel Pipe Fittings Technical Data

Specifications Chemical Composition Mechanical Properties International Equivalents

Carbon Steel Pipe Fittings Specifications

The table below summarizes the core specifications our carbon steel pipe fittings are manufactured to. Every parameter can be tailored to your project's line list or purchase specification.

Parameter	Specification
Governing Standard	ASTM A234 (WPB, WPC), ASTM A105, ASME B16.9, ASME B16.11
Size Range	1/8" NB to 48" NB
Wall Thickness	SCH 10, SCH 20, SCH 40, STD, SCH 80, XS, SCH 160, XXS
Pressure Class	150# to 9000#
End Connection	Butt weld, socket weld, threaded, flanged
Construction	Seamless and welded
Form	Forged and wrought, fabricated from pipe, plate or bar
Surface Finish	Black, painted, oiled, hot dip galvanized
Testing	Hydrostatic test, PMI, dye penetrant, radiography on request
Certification	Mill Test Certificate EN 10204 3.1, 3.2 on request

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° 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.
ASME B16.11	Forged socket weld and threaded fittings.

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

Chemical Composition (%) of Carbon Steel 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
A105	0.35	0.60 – 1.05	0.035	0.040	0.10 – 0.35

Mechanical Properties of Carbon Steel Pipe Fittings

Grade	Tensile Strength (MPa)	Yield Strength min (MPa)	Elongation min (%)
WPB	415 – 655	240	22
WPC	485 – 655	275	22
A105	485 min	250	22

Approximate International Equivalents of CS Pipe Fittings

ASTM/ASME	EN	JIS
A105	P245GH / P250GH (1.0460), EN 10222-2	G3201 SF440A
A234 WPB (fitting family)	Nearest base metal family: 10253-2 P235GH/P265GH	G3454 STPG370 (approx., base pipe)

Carbon Steel Buttweld Fittings Pressure-Temperature Rating (ASME B16.9 / B16.5 Class)

Pressure rating falls as service temperature rises. The table below gives representative values in psi for Class 150 and Class 300 buttweld fittings always confirm against the current ASME B16.5 rating tables for your exact grade and size.

Temperature (°F / °C)	Class 150 (psi)	Class 300, 1/4"–2" (psi)	Class 300, 2 1/2"–3" (psi)
-20 to 150 / -29 to 66	300	2000	1500
200 / 93	265	1785	1350
250 / 121	225	1575	1200
300 / 149	185	1360	1050
350 / 177	150	1150	900
400 / 204	–	935	750
450 / 232	–	725	600
500 / 260	–	510	450
550 / 288	–	300	300

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

Approximate weights for common sizes of ASME B16.9 buttweld fittings, schedule 40S. Full weight charts across all schedules and sizes are available on request from our sales team.

DN (mm)	90° LR Elbow (kg)	45° LR Elbow (kg)	Equal Tee (kg)
15	0.09	0.04	0.14
25	0.28	0.15	0.38
50	0.85	0.40	1.28
80	1.77	1.08	3.31
100	3.46	2.09	5.27
150	8.07	5.44	10.99
200	15.65	10.77	20.91
300	39.46	29.71	62.14

Types of Carbon Steel Fittings We Manufacture and Supply

Our range of carbon steel fittings is organized by construction type and shape so you can quickly find the right product for your line size, pressure rating and joint method:

Carbon Steel Threaded Fittings

NPT and BSP threaded elbows, tees and couplings for small-bore, mechanically joined utility and instrumentation lines.

Carbon Steel Socket Weld Fittings

A dedicated sub-range engineered for small-bore, high-pressure piping where a welded joint is required.

Carbon Steel Seamless Fittings

Fabricated from seamless pipe stock for critical, high-integrity service.

Carbon Steel Forged Fittings

Socket weld and threaded elbows, tees, couplings, unions, plugs and bushings for NPS 1/8 inch to 4 inch.

Carbon Steel Butt Weld Fittings

Elbows (45°, 90°, 180°), equal and reducing tees, concentric and eccentric reducers, caps and crosses for NPS 2 inch and above.

Carbon Steel Branch and Outlet Fittings (Olets)

For tapping a branch line directly off a run pipe without a full tee, including Weldolet, Threadolet, Sockolet, Sweepolet, Elbolet, Latrolet and Nippolet types.

Shop by Fitting Shape

Looking for one specific component? Go straight to: Carbon Steel Elbows, Carbon Steel Tee, Carbon Steel Reducers, Carbon Steel Cross, Carbon Steel Couplings, Carbon Steel Unions, Carbon Steel Stub End and Carbon Steel End Cap.

Not sure which construction fits your line size and pressure class?

Contact Solitaire Overseas for a quote, or browse our related Carbon Steel Pipes and Carbon Steel Tubes ranges.

Carbon Steel Pipe Fittings by Grade and Service Condition

Beyond standard WPB service, our carbon steel pipe fittings catalog covers special material grades for demanding 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 Fittings (WPL3, WPL6, WPL8, WPL9): for service below −29°C. See A420 WPL3, A420 WPL6, A420 WPL8 and A420 WPL9, or our general Low Temperature Carbon Steel Fittings overview.
ASTM A860 High Yield Fittings (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.
ASTM A350 Forged Low Temperature Fittings (LF1, LF2, LF3): forged socket weld/threaded fittings for low-temperature service. See A350 LF1, A350 LF2 and A350 LF3.
High Pressure Fittings: for Class 6000 and above at small bore, or SCH XXS at large bore. See Carbon Steel High Pressure Fittings.

Why Choose Solitaire Overseas as Your Carbon Steel Pipe Fittings Manufacturers

Sourcing from the right carbon steel pipe fittings manufacturers directly affects the safety and uptime of your piping system. Here is what sets our manufacturing and quality program apart:

In-house metallurgical control: raw material is sourced from approved mills and every heat is verified against ASTM A234 and A105 chemical and mechanical limits before production.
Dimensional accuracy: fittings are manufactured and checked to ASME B16.9 (butt weld) and ASME B16.11 (socket weld/threaded) tolerances on calibrated gauges.
Full testing capability: hydrostatic testing, positive material identification (PMI), dye penetrant testing and radiography are available in-house or through NABL/third-party accredited labs.
Documentation you can audit: EN 10204 3.1 mill test certificates are issued as standard, with 3.2 third-party certification, TPI witness and NACE MR0175 sour-service documentation available on request.
Flexible order quantities: from project MTO-driven bulk orders to urgent breakdown-replacement pieces, with export packing built for sea and air freight.

Carbon Steel Pipe Fittings Manufacturing Process

Understanding how a fitting is made helps buyers specify the right product for their service. Our carbon steel fittings move through the following stages:

1. Raw material selection: carbon steel plate, pipe or bar stock is selected per the target ASTM grade and verified with mill test certificates and spectrometric analysis.
2. Forming: butt weld fittings are hot formed, induction bent or pressed from pipe/plate; forged fittings are hot forged from billet under high pressure to achieve a dense, defect-free grain structure.
3. Heat treatment: normalizing or stress relieving is applied as required by ASTM A234/A105 to restore mechanical properties and relieve residual stresses from forming.
4. Machining: bevels, threads, sockets and bore dimensions are machined to ASME B16.9/B16.11 tolerances.
5. Inspection and testing: dimensional inspection, hydrostatic testing, PMI and NDT (dye penetrant/radiography) are carried out per the applicable code and the customer's inspection and test plan.
6. Surface finishing and packing: fittings are supplied black, painted, oiled or hot-dip galvanized, then export-packed with size, heat number and grade marking for traceability.

Applications of Carbon Steel Pipe Fittings

Oil and gas gathering, transmission and process piping
Petrochemical and refinery process units
Thermal and combined cycle power plants
Water, wastewater and desalination infrastructure
Shipbuilding and offshore platform piping
General industrial and structural piping systems

Which Carbon Steel Fitting Do You Need?

Use this quick reference to match your requirement to the right carbon steel fittings range on our site. On the live page, keep each item in the right column hyperlinked to the URLs used in the Types and Grade sections above.

Requirement	Recommended Fitting Type
Large bore process line, NPS 2" and up	Carbon Steel Buttweld Fittings
Small bore, NPS 4" and below, welded joint	Carbon Steel Forged Fittings
Small bore, welded joint specifically	Carbon Steel Socket Weld Fittings
Small bore, mechanically threaded joint	Carbon Steel Threaded Fittings
Fitting must be made from seamless pipe stock	Carbon Steel Seamless Pipe Fittings
Branch connection off an existing run pipe	Weldolet / Threadolet / Sockolet / Sweepolet
Pressure above Class 6000 at small bore, or SCH XXS at large bore	Carbon Steel High Pressure Fittings
Service below –29°C (–20°F)	Low Temperature Carbon Steel Fittings (A420 WPL series)
Cross country pipeline matched to API 5L X-grade pipe	High Yield Carbon Steel Pipe Fittings (A860 WPHY series)

Solitaire Overseas — Trusted Carbon Steel Pipe Fittings Suppliers Worldwide

As one of the reliable carbon steel pipe fittings suppliers exporting from India, Solitaire Overseas ships to fabricators, EPC contractors and stockists across the Middle East, Southeast Asia, Europe, Africa and the Americas. Our export documentation, packing and logistics are built around project timelines from single container shipments to phased deliveries against a multi-year MTO. Combined with our own manufacturing and testing capability, this makes us a single-window source for carbon steel pipe fittings, pipes and tubes, reducing the number of vendors your procurement team has to qualify and audit.

Every export shipment can include a packing list, commercial invoice, EN 10204 3.1/3.2 mill test certificate, heat-number traceability, and when requested a third-party inspection report from TUV, BV, DNV or Lloyd's Register.

Need matching plate, flange or pipe material for the same project? Talk to our team about our full Carbon Steel Products range alongside our carbon steel fittings catalog.

Carbon Steel Pipe Fittings Price

Carbon steel pipe fittings price varies far more than a single figure can capture a 1/2" NPT forged coupling and a 24" ASME B16.9 buttweld tee in high-yield WPHY grade can differ in price by well over 100x.

Send us your size, schedule, grade and quantity and we'll return a firm FOB or CIF quote, most enquiries are answered within 24 hours. Request a quote.

Frequently Asked Questions - Carbon Steel Pipe Fittings

What is the difference between ASTM A234 and ASTM A105 carbon steel fittings?

ASTM A234 covers wrought carbon steel fittings of seamless and welded construction, mainly butt weld types, while ASTM A105 covers forged carbon steel components machined from solid bar or billet, used for socket weld and threaded fittings.

What sizes of carbon steel pipe fittings does Solitaire Overseas supply?

We supply carbon steel pipe fittings from NPS 1/8 inch through 48 inch, across pressure classes 150# to 9000#, in butt weld, forged, socket weld and threaded configurations.

Do you provide mill test certificates with every shipment?

Yes, every consignment is supplied with an EN 10204 3.1 mill test certificate as standard, with 3.2 third party certification available on request.

Can carbon steel fittings be used in sour or H2S service?

Standard WPB and A105 grades are not designed for sour service by default. For NACE MR0175 compliant sour service we control sulfur content and arrange supplementary testing on request; share your project specification with our team to confirm feasibility.

What is the lead time for a bulk carbon steel pipe fittings order?

Lead time depends on size, quantity and testing requirements. Send your specification sheet to our sales team for a project specific delivery schedule.

Are these fittings compatible with ASTM A106 and API 5L pipe?

Yes, carbon steel butt weld and forged fittings under ASTM A234 and A105 are dimensionally and metallurgically compatible with ASTM A106 Grade B and API 5L Grade B seamless pipe.

What is the difference between WPB and WPC in ASTM A234?

WPB and WPC are both carbon steel fittings grades under ASTM A234, distinguished mainly by carbon content and mechanical strength. WPB is the general-purpose grade used across most moderate-to-high-temperature piping. WPC has a slightly higher carbon and manganese content, giving it higher tensile and yield strength — it is specified less often, typically where the higher strength is needed within the same wall thickness.

What does the WPB designation actually stand for?

In ASTM A234 WPB, "W" indicates the fitting is made from wrought steel, "P" indicates it is pressure-rated, and "B" identifies the specific chemical and mechanical property class within the standard. It is a grade designation, not an acronym for a phrase.

How do I choose the right carbon steel pipe fittings manufacturers for a project?

Look for carbon steel pipe fittings manufacturers that control raw material traceability from heat to finished part, hold in-house or accredited third-party testing (hydrostatic, PMI, NDT), and issue EN 10204 3.1/3.2 certification as standard. Ask for reference shipments in your industry of oil and gas, power or water and confirm they can support your inspection and test plan (ITP) and third-party inspection (TPI) requirements before placing a purchase order.

What should I check before finalizing carbon steel pipe fittings suppliers?

Beyond price, evaluate carbon steel pipe fittings suppliers on delivery reliability, export documentation experience, packing standard for sea/air freight, and their ability to consolidate fittings with matching pipe, tube and flange orders, this reduces vendor count and shipment risk on multi-item purchase orders.