Hastelloy C276 Forged Fittings | ASTM B564 UNS N10276 | ASME B16.11

Hastelloy C276 Forged Fittings Specification
End-Type and Pressure Class Selection Guide
Socket Weld vs Threaded Quick Selection Guide
Types of Hastelloy C276 Forged Fittings
Applicable Standards for Hastelloy C276 Forged Fittings
NACE MR0175 and Sour Service Compliance
Standards of Hastelloy C276 Forged Fittings
Equivalent Grades of Hastelloy C276 Forged Fittings
Kalpataru Piping Complete Hastelloy C276 Product Range
Why Choose Kalpataru Piping
Frequently Asked Questions

Forged Fittings vs Buttweld Fittings: Know the Difference

Kalpataru Piping has two product codes for Hastelloy C276 fittings. While both are essential for critical corrosion-resistant piping systems, they vary in standard, sizes, end connection and use. This enables procurement engineers to choose the correct product with clarity.

Aspect	Hastelloy C276 Forged Fittings (ASME B16.11) [This Page]	Hastelloy C276 Buttweld Fittings (B16.9)
ASTM Spec	ASTM B564	ASTM B366
Dimension Standard	ASME B16.11	ASME B16.9 / B16.28
End Connection	Socket Weld + Threaded (NPT / BSPT)	Butt Weld
Size Range	1/8″ to 4″ NB (small-bore)	1/2″ to 24″ NB (full range)
Pressure Class	2000# / 3000# / 6000# / 9000#	Schedule-based (Sch 5S to XXS)
Grade Designation	UNS N10276 / 2.4819	WP-HC276 / WP-N10276
Typical Application	Instrumentation, small-bore process piping, high-pressure sour-gas service	Main-line process piping spools

If your application requires main-line, large-bore fittings, please visit our Hastelloy C276 Buttweld Fittings (B16.9) page.

Hastelloy C276 Forged Fittings: Manufacturer, Stockist and Exporter in India

Kalpataru Piping has a wide range of products in Hastelloy C276 Forged Fittings that are manufactured, exported, supplied and stocked in India. The Hastelloy C276 Forged Elbow Fittings are made of quality raw material. Hastelloy C276 Threaded Forged Fittings are used in different application industries including petroleum, chemical, construction, engineering, gas, and shipbuilding industries, and so on.

Hastelloy C276 Forged Threaded Elbow Fittings (UNS N10276) is resistant to weld heat-affected zone grain boundary precipitation, and can be used in most chemical and petrochemical processing applications in the as-welded condition. Kalpataru Piping exports, supplies and manufactures Hastelloy C276 Forged Fittings in various forms such as Screwed Fittings, 45 deg Threaded Elbow, Threaded Coupling, Threaded Union, Hexagonal Plug, Tee, 90 Deg Threaded Elbow, and so on.

Hastelloy C276 Forged Fittings Specification

Parameter	Details
Forged Fittings Specification	ASTM B564 / ASME SB564
Size Range	1/8″ NB to 4″ NB (Socket Weld and Screwed Threaded)
Dimensions	ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97, BS 3799
Fitting Types	Socket Weld Fittings, Screwed Threaded Fittings
Pressure Rating	Threaded End: Class 2000# / 3000# / 6000# Socket Weld End: Class 3000# / 6000# / 9000#
Thread Type	NPT, BSPT, BSPP
Test Certificates	EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report
Origin / Mills	Japanese, Indian, USA, Korean, European, Ukrainian, Russian
Specialized Manufacture	90 deg Elbows, 45 deg Elbows, Tees, Cross, Couplings, Reducers, Inserts, Caps, Nipples, Unions, Socket Weld and Threaded, Equal Tees and Reducing Tees, Plugs

Hastelloy C276 Forged Fittings: End-Type and Pressure Class Selection Guide

Procurement engineers specifying ASME B16.11 Hastelloy C276 forged fittings must match the end-type and pressure class to the operating conditions of the system. The table below provides the complete selection matrix for both end-type categories available from Kalpataru Piping.

End-Type	Pressure Class 1	Pressure Class 2	Pressure Class 3
Socket Weld (SW)	Class 3000#	Class 6000#	Class 9000#
Threaded / NPT / BSPT	Class 2000#	Class 3000#	Class 6000#

Socket Weld fittings are preferred in high-pressure service where a full-penetration fillet weld is acceptable and where pipe is inserted into the socket before welding. Threaded fittings (Class 2000 to 6000) are typically used in instrumentation lines, chemical injection skids, and low-flow process connections where disassembly may be required.

Socket Weld vs Threaded: Quick Selection Guide

Use Socket Weld (Class 3000# / 6000# / 9000#) when: welding is permitted, leak-tight seal is critical, and high pressure or temperature conditions apply.

Use Threaded NPT/BSPT (Class 2000# / 3000# / 6000#) when: disassembly is required for maintenance, the line is low-flow instrumentation, or welding is restricted in hazardous areas.

Both end-types are available in size range 1/8″ to 4″ NB from Kalpataru Piping with full ASTM B564 mill certification.

Types of Hastelloy C276 Forged Fittings: Complete Part Enumeration

Kalpataru Piping manufactures and stocks the full range of ASME B16.11 Hastelloy C276 UNS N10276 forged fitting part types for both socket weld and threaded end connections. All parts are available in Class 2000# through 9000# as applicable and in sizes 1/8″ NB to 4″ NB.

90 Degree Elbow (Hastelloy C276 Forged)

The Hastelloy C276 90 Degree Forged Elbow is used to change flow direction by 90 degrees in small-bore piping systems. Available in socket weld (Class 3000# / 6000# / 9000#) and threaded NPT/BSPT (Class 2000# / 3000# / 6000#) ends, conforming to ASME B16.11. Both equal and street elbow configurations are available.

45 Degree Elbow (Hastelloy C276 Forged)

The Hastelloy C276 45 Degree Forged Elbow provides a gradual 45-degree direction change and is preferred in applications where moderate flow deflection is needed with lower pressure drop. Supplied in socket weld and threaded end connections per ASME B16.11 in all standard pressure classes.

Equal Tee and Reducing Tee (Hastelloy C276 Forged)

Hastelloy C276 Forged Tees are used at branch connections in small-bore piping. Equal tees have the same nominal bore on all three outlets. Reducing tees have a smaller branch outlet and are used where a reduced-flow branch connection is required. Both socket weld and threaded types are available in Class 3000# and 6000#.

Cross (Hastelloy C276 Forged)

The Hastelloy C276 Forged Cross provides four-way flow branching from a single fitting body. Used in instrumentation and chemical process lines, the forged cross is manufactured to ASME B16.11 and ASTM B564 in threaded Class 2000# / 3000# and socket weld Class 3000# / 6000# configurations.

Full Coupling and Half Coupling (Hastelloy C276 Forged)

Full Couplings connect two pipes of the same size end to end. Half Couplings (also called branch connections) are welded to the run pipe to create a branch outlet. Hastelloy C276 Full Coupling and Half Coupling are supplied to ASME B16.11 in socket weld (3000# / 6000# / 9000#) and threaded (2000# / 3000# / 6000#) variants.

Reducer Insert (Hastelloy C276 Forged)

The Hastelloy C276 Forged Reducer Insert is used inside a socket weld fitting to reduce the bore at that connection point. Manufactured to MSS SP-79, reducer inserts are compact and eliminate the need for a separate reducing fitting at socket weld joints. Available from Kalpataru Piping in Class 3000# and 6000#.

Cap (Hastelloy C276 Forged)

The Hastelloy C276 Forged Cap provides a pressure-tight closure at the end of a pipe or fitting in socket weld or threaded end configurations. Dimensioned per ASME B16.11, caps are widely used for hydrotest blanking and permanent pipe-end closures in chemical process and oil and gas service.

Plug: Square Head, Hex Head and Round Head (Hastelloy C276 Forged)

Hastelloy C276 Forged Plugs are used to seal threaded openings in valves, manifolds, and instrument connections. Three drive configurations are available: square head, hex head, and round head (flush plug). Manufactured to ASME B16.11 and MSS SP-95 in Class 2000# / 3000# / 6000# threaded NPT/BSPT.

Bushing (Hastelloy C276 Forged)

Forged Hastelloy C276 Bushings are used to connect a larger-bore female threaded fitting to a smaller male threaded pipe. Available as hex bushing (with external wrench flats) and flush bushing. Supplied per ASME B16.11 in standard threaded pressure classes.

Boss (Hastelloy C276 Welding Boss)

The Hastelloy C276 Welding Boss is a machined pad fitting that is welded onto pipe and provides a threaded or socket weld outlet for instrumentation taps, chemical injection, or vent and drain connections. Commonly used in chemical process and sour-gas service applications.

Union (Hastelloy C276 Forged)

The Hastelloy C276 Forged Union is a three-piece fitting that allows a pipe connection to be made or broken without disturbing the adjacent piping. Available in threaded (NPT/BSPT) Class 2000# / 3000# / 6000# per MSS SP-83 and in socket weld variants per ASME B16.11.

Hex Nipple and Barrel Nipple (Hastelloy C276 Forged)

Hastelloy C276 Hex Nipples provide an externally threaded connector with a central hex drive section for wrench engagement. Barrel Nipples are longer extensions used for spaced connections. Both are manufactured per ASME B16.11 and are available in NPT/BSPT thread forms, Class 3000# and 6000#.

Swage Nipple (Hastelloy C276 Forged)

Hastelloy C276 Swage Nipples (also called swaged nipples) are used to transition between two different pipe sizes in a compact single fitting. Manufactured to MSS SP-95, swage nipples are available in concentric and eccentric configurations, with plain, threaded, or socket weld ends.

Street Elbow (Hastelloy C276 Forged)

The Hastelloy C276 Street Elbow (also called a service elbow) has one male end and one female end, allowing it to connect directly to another fitting without an additional nipple. Available in 90-degree and 45-degree configurations, Class 3000# threaded NPT/BSPT, per ASME B16.11.

Applicable Standards for Hastelloy C276 Forged Fittings

All Hastelloy C276 ASTM B564 forged fittings supplied by Kalpataru Piping conform to the following applicable standards and codes:

Standard	Scope and Application
ASTM B564 / ASME SB564	Standard Specification for Nickel Alloy Forgings. The primary forging specification for Hastelloy C276 (UNS N10276) forged fittings, covering chemical composition, mechanical properties, heat treatment and test requirements.
ASME B16.11	Forged Fittings, Socket-Welding and Threaded. Governs dimensions, tolerances, ratings and markings for socket weld and threaded forged fittings in Class 2000# through 9000#.
MSS SP-79	Socket Welding Reducer Inserts. Dimensional standard for reducer inserts used in socket weld joints.
MSS SP-83	Pipe Unions, Socket Welding and Threaded. Dimensional standard covering Class 3000# and 6000# unions in socket weld and threaded configurations.
MSS SP-95	Swaged Nipples and Bull Plugs. Covers dimensions, ratings and markings for swaged nipples (concentric and eccentric) and bull plugs.
MSS SP-97	Integrally Reinforced Forged Branch Outlet Fittings. Applies to socket weld, threaded and butt-welded branch outlet fittings (olets) used as branch connections.
BS 3799	Specification for Steel Pipe Fittings, Screwed and Socket-Welding for the Petroleum Industry. British standard used in projects following BSPT thread forms and UK/Middle East EPC requirements.
ASME B1.20.1	Pipe Threads, General Purpose (Inch). Governs NPT thread form dimensions used on all threaded forged fittings.
ISO 4144	Threaded fittings for petroleum, petrochemical and allied industries. Covers stainless steel and nickel alloy fittings threaded to ISO 7-1 (BSPT).
ASTM B366	Note: ASTM B366 applies to buttweld fittings only. For Hastelloy C276 forged fittings, the correct forging specification is ASTM B564 (UNS N10276). See our Hastelloy C276 Buttweld Fittings page for B366 products.

NACE MR0175 and Sour Service Compliance

NACE MR0175 / ISO 15156 Compliant Material

Hastelloy C276 (UNS N10276) is listed in NACE MR0175 / ISO 15156 Part 3 as an acceptable material for use in hydrogen sulfide (H2S) containing environments (sour service) in oil and gas production systems.

Kalpataru Piping supplies Hastelloy C276 ASTM B564 forged fittings to clients requiring documented NACE MR0175 compliance for subsea, wellhead, Christmas tree, and process gas service applications.

Material Test Reports (MTR) in accordance with EN 10204 3.1B are provided with each order. Third-party inspection by TUV, Bureau Veritas, SGS, or any client-nominated agency is available on request.

PWHT (Post Weld Heat Treatment) requirements, hardness testing, and HIC/SSC test reports are available for project-specific sour service qualification.

Procurement teams in oil and gas, LNG, sour gas processing, and subsea engineering routinely specify Hastelloy C276 forged fittings for instrument manifolds, chemical injection systems, and small-bore process connections where resistance to chloride stress corrosion cracking and pitting is mandatory. Kalpataru Piping supports these requirements with full documentation packages.

Standards of Hastelloy C276 Forged Fittings

Standard	Description
ASTM B564 / B564M	Forged Fittings and valves and parts for high temperature service. Standard Specification for Wrought Austenitic Hastelloy Forged Fittings.
BS21	Threading.
BS3799	Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry.
ANSI B16.11	Forged steel fittings socket-welding and threaded. Socket Welding and Threaded Forged Fittings.
ANSI/ASME B1.20.1	Pipe threads, general purpose (inch).
ISO 4144	Hastelloy fittings threaded to ISO 7-1.
MSS SP-95	Swage(d) Nipples and Bull Plugs.

Equivalent Grades: Hastelloy C276 Forged Fittings

Standard	UNS	WERKSTOFF NR.	AFNOR	EN	JIS	OR	GOST
Hastelloy C276	N10276	2.4819	Not listed	NiMo16Cr15W	NW 0276	EP760	KhN65MVU

Chemical Composition of Hastelloy C276 Forged Fittings

Grade	C	Mo	Mn	Si	Fe	P	S	Co	Cr	W	Ni
C276	0.01	15.0 to 17.0	1.0	0.08	4.00 to 7.00	0.04	0.03	2.5	14.5 to 16.5	3 to 4.5	Bal

Mechanical Properties of Hastelloy C276 ASTM B564 Forged Fittings

Grade	Density	Melting Point	Yield Strength (0.2% Offset)	Tensile Strength	Elongation
C276	8.89 g/cm3	1370 degC (2500 degF)	Psi: 52,000 \| MPa: 355	Psi: 115,000 \| MPa: 790	40%

Types of Hastelloy C276 Forged Fittings Available at Kalpataru Piping

Hastelloy C276 Forged Union

Hastelloy C276 Forged Tee

Hastelloy C276 Forged Pipe Nipple

Hastelloy C276 Forged Elbow

Hastelloy C276 Forged Cross

Hastelloy C276 Forged Coupling

ASTM B366 Hastelloy C22 Buttweld Pipe Fittings Equivalent Grades:

STANDARD	UNS	WERKSTOFF NR.	JIS	EN
Hastelloy C22	N06022	2.4602	NW 6022	NiCr21Mo14W

Hastelloy C22 Pipe Fittings Chemical Composition:

Grade	C	Mn	Si	S	Co	Ni	Cr	Fe	Mo	P
Alloy C22	0.010 max	0.50 max	0.08 max	0.02 max	2.50 max	50.015 min*	20.00 – 22.50	2.00 – 6.00	12.50 – 14.50	0.02 max

Hastelloy C22 Forged Fittings Mechanical Properties:

Element	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
Hastelloy C22	8.69 g/cm3	1399 °C (2550 °F)	Psi – 1,00,000 , MPa – 690	Psi – 45000 , MPa – 310	45 %

Kalpataru Piping: Complete Hastelloy C276 Product Range

Kalpataru Piping is a single-source supplier for the complete Hastelloy C276 piping system. Engineers procuring Hastelloy C276 forged fittings typically co-purchase the following complementary product lines for their instrumentation skids, pipe spools, or process piping packages:

Product	Application and Link
Hastelloy C276 Seamless Pipes and Tubes	The primary material for small-bore process lines matched to forged fittings. Hastelloy C276 Seamless Pipes and Tubes
Hastelloy C276 Buttweld Fittings (B16.9)	For large-bore main-line connections where butt welding is specified. Hastelloy C276 Buttweld Fittings (B16.9)
Hastelloy C276 Flanges	Typically purchased alongside forged fittings for equipment nozzle connections. Hastelloy C276 Flanges
Hastelloy C276 Pipe Spools	Prefabricated spool assemblies incorporating forged fittings and flanges. Hastelloy C276 Pipe Spools
Hastelloy C276 Instrumentation Valves	Needle valves, ball valves and manifolds paired with forged fittings on instrument skids. Hastelloy C276 Instrumentation Valves
Hastelloy C276 Filler Wire	Matching welding consumable required for site welding of socket weld fittings. Hastelloy C276 Filler Wire

Marking and Packing of Hastelloy C276 Forged Fittings

Kalpataru Piping packs Hastelloy C276 Forged Fittings properly and carefully to ensure that there is no damage during transit. Each fitting is marked with the material grade (C276 / UNS N10276), pressure class, size, heat number, and manufacturer identity per ASME B16.11 marking requirements. Fittings are packed in wooden boxes and exported worldwide with all test certificates included.

Quality Assurance: Hastelloy C276 Forged Fittings

Kalpataru Piping is one of the most trusted exporters, suppliers, stockists and manufacturers of Hastelloy C276 Forged Fittings in India. Each fitting is inspected at every stage of the production process to ensure that quality is not compromised. Fittings are examined against applicable standards and third-party inspection is available on client request. Test certificates are issued with every shipment.

Available tests and documents include: Chemical Analysis Report, Mechanical Properties Test Report, Hardness Test Report, Positive Material Identification (PMI) Report, Radiography Test Report, Hydrostatic Test Report, EN 10204 3.1B Mill Test Certificate, Third Party Inspection Certificate.

Why Choose Kalpataru Piping for Hastelloy C276 Forged Fittings?

Huge ready stock of Hastelloy C276 Forged Fittings in Class 2000# through 9000# for immediate dispatch.
Large production capacity for urgent and bulk orders of ASTM B564 UNS N10276 forged fittings.
Highest quality Hastelloy C276 Forged Fittings supplied at competitive prices with full documentation.
Customised sizes and pressure classes available depending on project specifications.
Full NACE MR0175 compliance documentation available for sour-service and oil and gas projects.
Third-party inspection by TUV, Bureau Veritas, SGS, or client-nominated inspection agency.
• Export packaging with EN 10204 3.1B certificates, shipped globally to over 50 countries

Frequently Asked Questions: Hastelloy C276 Forged Fittings

The following questions are commonly raised by piping engineers and procurement teams when specifying ASTM B564 UNS N10276 Hastelloy C276 forged fittings for chemical, petrochemical, oil and gas, and pharmaceutical applications.

What is the difference between ASTM B564 and ASTM B366 for Hastelloy C276 fittings?

ASTM B564 is the standard specification for nickel alloy forgings and applies to Hastelloy C276 forged fittings (socket weld and threaded) manufactured to ASME B16.11. ASTM B366 applies to factory-made wrought nickel and nickel-alloy buttweld fittings, including Hastelloy C276 buttweld elbows, tees and reducers manufactured to ASME B16.9 or B16.28. When specifying forged small-bore fittings (1/8″ to 4″ NB) for socket weld or threaded connections, ASTM B564 is the correct forging standard to reference.

What is the difference between Hastelloy C276 socket weld fittings and threaded fittings?

Socket weld fittings (Class 3000# / 6000# / 9000#) have a counter-bore socket into which the pipe is inserted before welding with a fillet weld. They are preferred for permanent, leak-tight, high-pressure connections and cannot be disassembled without cutting. Threaded fittings (Class 2000# / 3000# / 6000#) use NPT or BSPT male and female threads for mechanical connection, allowing assembly and disassembly without welding. Threaded fittings are widely used in instrumentation lines, chemical injection systems, and low-flow process connections where maintenance access is required.

What pressure class is standard for Hastelloy C276 forged fittings?

The standard pressure classes for Hastelloy C276 ASME B16.11 forged fittings are: Socket Weld end: Class 3000#, 6000# and 9000#. Threaded NPT/BSPT end: Class 2000#, 3000# and 6000#. Class 3000# is the most commonly specified class for general chemical process and instrumentation applications. Class 6000# and 9000# (socket weld) are specified for very high-pressure service such as sour gas injection lines, high-pressure hydraulic systems and wellhead chemical injection. Kalpataru Piping carries ready stock of all standard pressure classes.

Are Hastelloy C276 forged fittings NACE MR0175 compliant?

Yes. Hastelloy C276 (UNS N10276) is listed as an acceptable material in NACE MR0175 / ISO 15156 Part 3 for use in sour service environments (H2S containing fluids) in oil and gas production. Kalpataru Piping supplies NACE MR0175 compliant Hastelloy C276 forged fittings with EN 10204 3.1B material test reports confirming chemical composition, mechanical properties and hardness within the limits permitted by the standard. Project-specific hardness testing and third-party certification are available on request.

What is the available size range for Hastelloy C276 ASME B16.11 forged fittings?

Hastelloy C276 forged fittings to ASME B16.11 are available in sizes 1/8″ NB to 4″ NB (Nominal Bore) in both socket weld and threaded end connections. This size range covers all standard small-bore piping applications including instrumentation, chemical injection, vent and drain connections, and small-bore process piping. For sizes above 2″ NB in main-line process applications, buttweld fittings to ASME B16.9 (ASTM B366) are typically more economical. Kalpataru Piping maintains ready stock across the full size range in Class 3000# and 6000#, with Class 9000# and Class 2000# available on short lead times.