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Industrial Pipe Fittings | ASME/ANSI Butt-Weld & Forged Piping Components for Process Industries

Industrial piping systems require components that maintain structural integrity under continuous thermal expansion, mechanical vibration, and internal pressure. These industrial pipe fittings, comprising seamless and welded elbows, tees, reducers, and couplings, are engineered for heavy-duty fluid and gas transport across energy, chemical, and mechanical sectors. Every fitting is manufactured from traceable raw material billets and plates, shaped via hot forming, cold pressing, or precision forging, and fully heat-treated to eliminate residual internal stresses before machining and beveling.

Steel Pipe Cap
1.Brand and origin:HAIHAO,made in China,strictly conforming to ASME B16.9 GOST 17379 DIN 2617.
2.Surface treatment:bare surface,painting,anti-rust oil,anti-corrosion coating,hot-dip...
ASME Elbow
HAIHAO brand provides butt-welding elbows conforming to ASME B16.9, used for changing the flow direction in industrial piping systems. The product size ranges from 1/2 inch to 48 inches, with...
Steel Pipe Elbow
Brand Name：HAIHAO
Habitat：CHINA
Execution Standard：ASME B16.9、GOST 17375、GOST 30753、DIN2605
Eccentric Weld Reducer
Structure Type: Eccentric design.
Wall Thickness Classes: SCH10–SCH160, XXS, GOST, DIN, etc.
Steel Concentric Reducer
Structure: Butt-Welding connection, concentric design.
Dimensions: Custom sizes availabl.
ASME Tee
The HAIHAO brand ASME B16.9 butt-welding fittings series is designed and manufactured in strict accordance with the ASME B16.9-2024 standard, covering various structural types including equal...
Steel Tee
The HAIHAO steel tee is a pipe fitting designed and manufactured in accordance with ASME B16.9, GOST 17376, and DIN2615 standards, with a size range of 1/2" to 48" (DN15–DN1200). Wall thickness...
Butt Weld Tee
A butt weld tee is available from NPS 1/2 to NPS 48 across multiple wall-thickness series.
Its weld ends allow the branch fitting to join directly into a fabricated piping system.
Stainless Steel Reducing Tee
A stainless steel reducing tee is available in GOST and ASME size systems, with five wall-thickness series.
Its reduced outlet connects a smaller branch to a larger run within one fitting.
Carbon Steel Tee
High Strength, Strong Pressure-Bearing Capacity
Excellent Weldability, Easy to Install
High Cost-Effectiveness, Economical and Durable
High Pressure Tee
High Pressure Resistance, Safe and Reliable
Precision Formed, Leak-Free
Corrosion Resistant, Long Service Life
90 Degree Steel Elbow
The 90 degree steel elbow is made for butt-weld piping where a full right-angle turn is needed without changing the pipe size. The range in the sheet starts at NPS 1/2 inch and goes up to NPS 48 inch.

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Product Types

Butt-Weld Fittings (ASME B16.9 / MSS SP-43):

Elbows: Long radius (LR) and short radius (SR) 90 degree, 45 degree, and 180 degree return bends designed to minimize pressure drop during directional changes.
Tees: Equal and reducing tees engineered with reinforced branch outlets to sustain hoop stress under high operating pressures.
Reducers: Concentric and eccentric reducers fabricated with smooth transition angles to prevent cavitation and flow turbulence in vertical or horizontal lines.
Caps & Stub Ends: End closures and lap joint stub ends utilized alongside backup flanges for inspectable, non-welded piping joints.

Forged Threaded & Socket-Weld Fittings (ASME B16.11):

Unions, Couplings, & Half-Couplings: Precision-machined threaded (NPT, BSPT) and socket-weld connectors for instrumentation and small-bore utility lines.
Bushing & Plugs: Solid barstock-machined components used for line reduction and terminal sealing.

Materials & Standards

Material Category	Material Grade / Standard	Manufacturing Type	Typical Application
Carbon Steel	ASTM A235 WPB, WPC	Butt-Weld	Standard industrial water, oil, and gas utilities requiring moderate tensile strength and weldability
Carbon Steel	ASTM A105 / A105N	Forged	Standard industrial water, oil, and gas utilities requiring moderate tensile strength and weldability
Stainless Steel	ASTM A403 WP304/304L, WP316/316L	Butt-Weld	Corrosive chemical handling, pharmaceutical, and food-grade hygienic processing lines
Stainless Steel	ASTM A182 F304/304L, F316/316L	Forged	Corrosive chemical handling, pharmaceutical, and food-grade hygienic processing lines
Alloy Steel & Special Alloys	ASTM A234 WP11, WP22	Butt-Weld	High-temperature refinery heaters and power plant steam lines
Alloy Steel & Special Alloys	ASTM A182 F11, F22	Forged	High-temperature refinery heaters and power plant steam lines
Alloy Steel & Special Alloys	ASTM A182 F51/F60	Forged	Aggressive marine environments and other demanding corrosive services

Technical Specifications

Technical Parameter	Specification
Size Range – Butt-Weld	NPS 1/2" to NPS 48" (DN15 to DN1200)
Size Range – Forged	NPS 1/8" to NPS 4" (DN6 to DN100)
Wall Thickness – Schedules	Sch 5S, Sch 10S, Sch 40/Standard, Sch 80/Extra Strong (XH), Sch 160, XXH
Custom Wall Thickness	Heavy-wall thicknesses up to 100 mm
Dimensional Tolerances	Compliance with ASME B16.9 table tolerances for center-to-end dimensions, bevel-end ovality, and wall thickness reduction at the extrados of formed elbows
Elbow Wall Thinning	Maximum thinning controlled within applicable code limits
Butt-Weld End Preparation	Beveled ends at 37.5° ±2.5°, with 1.6 mm ±0.8 mm root face, per ASME B16.25
Threaded End Preparation	NPT threads machined to ANSI/ASME B1.20.1

Applications

01/

Oil & Gas Upstream & Downstream: Crude oil gathering lines, refinery fractionator overhead piping, and petrochemical transfer manifolds.

02/

Power Generation: Superheated steam lines, boiler feed water networks, and auxiliary cooling water loops in thermal and nuclear plants.

03/

Chemical & Process Engineering: Acid transport piping, reactor feed lines, and closed-loop solvent recovery systems.

04/

Water Treatment & Desalination: High-pressure reverse osmosis (RO) skid piping and municipal sewage treatment booster stations.

Manufacturing & QC

Forming Process:
Seamless elbows produced via mandrel hot-push forming or cold-forming push benches to ensure uniform grain structure and wall thickness distribution. Large-diameter tees shaped via hydraulic cold extrusion to maintain fiber continuity along the branch junction.

Heat Treatment:
Full-cycle normalization, quenching, and tempering conducted in programmable gas-fired furnaces to relieve internal stresses induced by hot/cold forming and to restore optimal mechanical impact values.

Non-Destructive Examination (NDE) & Inspection:
Dimensional Verification: Laser scanners and digital coordinate measuring equipment checking bevel angles, out-of-roundness, and center-to-face dimensions.

Surface & Volumetric Testing: 100 percent visual inspection, magnetic particle testing (MT) for carbon steel fittings, liquid penetrant testing (PT) for stainless steel, and ultrasonic testing (UT) or radiographic examination (RT) for critical seam welds on welded fittings.

Material Certification: Mill Test Certificates (MTRs) issued in strict accordance with EN 10204 3.1, detailing chemical ladle analysis, tensile strength, yield strength, elongation, and hardness test results.

Customization & OEM

Custom Geometries:

Fabrication of non-standard transition reducers, asymmetrical lateral tees, heavy-wall thick-to-thin walled transition pieces, and special-radius elbows engineered for tight-space modular skid designs.

Special Material Sourcing:

Processing customer-specified high-nickel alloys (Inconel, Monel, Hastelloy) and titanium grades for severe service environments.

Surface Finishes & Coatings:

Anti-rust black painting, transparent varnishing, hot-dip galvanizing, and pickling-passivation treatments for stainless steel surfaces to prevent transit oxidation.

Stamping & Traceability:

Low-stress permanent die stamping or electrochemical etching of heat numbers, material grades, size, schedule, and manufacturing standards directly onto each fitting body.

Packaging & Delivery

Export-Grade Packaging:

Fittings sorted by size and packed in heavy-duty fumigated wooden crates or secured onto reinforced plywood pallets with heavy-duty steel strapping.

End Protection:

Plastic bevel protectors installed on all butt-weld ends, and plastic caps fitted on threaded/socket-weld connections to prevent thread damage and ingress of moisture or debris during ocean transit.

Documentation Package:

Complete export documentation package dispatched ahead of shipment, including commercial invoices, packing lists, Certificate of Origin (CO), bill of lading, and verified EN 10204 3.1 Mill Test Certificates.

FAQ

Q: What is the difference between long radius (LR) and short radius (SR) elbows?

A: Long radius elbows have a centerline radius equal to 1.5 times the nominal pipe size (1.5 x NPS), resulting in lower pressure drop and smoother flow transitions. Short radius elbows have a radius equal to 1.0 x NPS, making them suitable for restricted-space installations where piping runs must navigate tight physical envelopes.

Q: How do you control wall thickness thinning on the outer curve of formed elbows?

A: During the hot-push or cold-forming process, hydraulic feed rates and local induction heating temperatures are dynamically regulated based on starting material thickness and final bend radius, ensuring that wall thinning at the extrados remains well within the minimum allowable limits specified by ASME B16.9.

Q: Are your pipe fittings supplied with EN 10204 3.1 Mill Test Certificates?

A: Yes. Every shipment includes traceable EN 10204 3.1 MTRs covering chemical composition, mechanical property test data (tensile, yield, elongation), hardness values, and results of required non-destructive testing.

Q: What bevel preparation is standard for butt-weld fittings?

A: Standard butt-weld fittings are supplied with a 37.5 degree bevel angle (plus or minus 2.5 degrees) and a 1.6mm (plus or minus 0.8mm) root face in compliance with ASME B16.25. Compound bevels or special root face dimensions can be customized upon request for heavy-wall applications.

Q: Can you manufacture fittings to non-standard dimensions or proprietary client drawings?

A: Yes. OEM manufacturing services support custom dimensions, specialized wall schedules, non-standard angles (e.g., 30 degree, 60 degree elbows), and proprietary geometric configurations based on engineering drawings or piping isometric sheets.

Q: What corrosion protection is applied to carbon steel fittings prior to shipment?

A: Carbon steel fittings are thoroughly degreased, grit-blasted to remove mill scale, and coated with a thin layer of weldable anti-rust oil or water-based protective paint. For longer ocean transit or extended storage, industrial exterior primer or internal rust-preventative coatings can be applied.

Q: How do you ensure raw material traceability from raw billet to finished fitting?

A: Each incoming raw material plate or barstock is assigned a unique heat number upon arrival. This heat number is transferred through every stage of cutting, forming, heat treatment, and machining via physical die-stamping and digital tracking logs, ensuring full backward traceability to the original steel mill melt report.

As one of the most professional pipe fittings manufacturers and suppliers in China, we are able to meet the needs of the majority of our customers. Please rest assured to wholesale high quality pipe fittings made in China here from our factory. For price consultation, contact us.