Carbon Steel Pipe Fittings Manufacturer & Exporter

Solitaire Overseas manufactures and exports carbon steel pipe fittings for pressure piping used across oil and gas, petrochemical, power generation and water infrastructure projects. Our catalog covers butt weld, forged socket weld and threaded constructions in ASTM A234 WPB/WPC and ASTM A105 grades, spanning NPS 1/8 inch through 48 inch and pressure classes from 150# to 9000#. Every consignment is dispatched with mill test certificates, third party inspection support and complete dimensional traceability, giving EPC contractors, fabricators and stockists one dependable source for elbows, tees, reducers, caps and small bore fittings.

Carbon Steel Pipe Fittings Specifications

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

Types of Carbon Steel Pipe Fittings

Butt Weld Fittings - elbows (45°, 90°, 180°), equal and reducing tees, concentric and eccentric reducers, caps and crosses for NPS 2 inch and above. See our Carbon Steel Butt Weld Fittings range.
Forged Fittings - socket weld and threaded elbows, tees, couplings, unions, plugs and bushings for NPS 1/8 inch to 4 inch. See our Carbon Steel Forged Fittings range.
Socket Weld Fittings and Threaded Fittings- dedicated sub ranges built for small bore, high pressure and instrumentation piping.
Special Service Fittings - high pressure, low temperature (ASTM A420 WPL6) and high yield (ASTM A860 WPHY) variants for demanding pipelines.

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.

Chemical Composition, Mechanical Properties and Equivalent Grades

Chemical Composition Mechanical Properties International Equivalents

Chemical Composition (%)

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

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

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)

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 fitting range on our site.

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
Cross country pipeline matched to API 5L X-grade pipe	Carbon Steel High Yield Pipe Fittings

Frequently Asked Questions

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.