Zizi is a professional manufacturer specialized in high-quality SS304 and SS316 stainless steel butt weld pipe fittings. Our comprehensive product portfolio encompasses equal and reducing tees, pipe elbows and bends, as well as concentric and eccentric reducers, covering mainstream specifications for industrial piping systems.

Featuring outstanding structural stability, corrosion resistance and durable service life, our stainless steel pipe fittings are widely applicable across diverse industrial sectors. To support fast customer procurement and on-time project progress, we maintain sufficient in-stock supplies of standard-sized SS304 and SS316 butt weld fittings. We closely track shipping schedules and optimize delivery arrangements, ensuring every order is shipped and delivered punctually to meet clients’ construction and production timelines.

ASME B16.9 Standards Specifications 

All our stainless steel butt weld fittings are manufactured in strict compliance with ASME B16.9 and ANSI B16.19 industry standards, adhering to rigorous industrial production and testing norms.

Size Range: 1/2 inch to 80 inch (DN15 to DN2000)

Wall Thickness Grades: Sch 10S, 20, STD, 40S, 80S, 100, 120, 140, 160 and XXS

Production Types: Seamless and welded structural styles for different piping pressure requirements

End Finishes: Beveled End (BE) and Plain End (PE) for diversified welding installation needs

As a core industrial specification, the ASME B16.9 standard governs all factory-produced wrought butt weld pipe fittings, covering standardized requirements for product dimensions, dimensional tolerances, pressure ratings, performance testing and permanent product marking to guarantee consistent product quality and interchangeability.

Types of Stainless Steel Butt Weld Fittings

Our full line of butt weld fittings is designed to fulfill different piping system functional demands, covering direction adjustment, branch connection, pipeline sealing, caliber conversion and flange matching scenarios.

Stainless Steel Pipe Elbows & Bends

Stainless Steel Pipe Elbows ASME B16.9

Butt weld elbows serve to connect two pipes of identical or different nominal diameters, enabling directional turning of piping systems. We provide three mainstream specifications: 45°, 90° and 180° elbows, which are essential components for adjusting pipeline layout in industrial piping engineering.

Equal and Reducing Tee

Stainless Steel Pipe Tee ASME B16.9

Known as three-way pipe connectors, butt weld tees are adopted to form three-port pipeline junctions, featuring a T-shaped structure with two inlet ports and one outlet port. The product series includes equal tees for uniform pipe connection and reducing tees for variable-diameter pipe branching.

Stainless Steel Caps (Pipeline Sealing)

Stainless Steel Caps ASME B16.9

Butt weld end caps, also named pipe caps, are professionally used for welding and sealing the tail ends of pipelines, effectively closing pipeline passages for system commissioning, maintenance and permanent sealing purposes.

Conc&Ecc Reducers (Caliber Conversion)

Conc&Ecc Reducers

Reducer fittings are applied to connect pipelines with different calibers to realize smooth transition of pipe flow diameters. Our product range covers concentric reducers, eccentric reducers and reducing elbows to adapt to different installation and fluid transmission requirements.

Lap Joint Stub Ends (Flange Matching)

Lap Joint Stub Ends  ASME B16.9

Lap joint stub ends are supporting fittings for lap joint flanges. The two components are used in combination to form stable and detachable flange connection structures, widely used in piping systems that require frequent disassembly and maintenance.

ASTM A403 Stainless Steel Material Grade Standards

Our stainless steel butt weld fittings adopt premium ASTM standard stainless steel materials with complete grade specifications, meeting high-standard anti-corrosion and high-temperature resistant working conditions:

ASTM Grades: ASTM A403 WP304/304L, WP304H, WP310S, WP316/316L, WP317, WP321, WP947

Corresponding UNS Codes: S30400, S30403, S30409, S31008, S31600, S31603, S31700, S32100

Stainless Steel Butt Weld Fittings Packaging & Logistics Assurance

SS304 &SS316 stainless steel butt weld fittings

To ensure product integrity during transportation, we implement standardized and refined packaging procedures for all stainless steel butt weld fittings. Each fitting is clearly marked with key information including material grade, batch number, size specification, execution standard and wall thickness schedule. All products are individually wrapped with protective films to prevent surface scratches and oxidation.

For small-diameter fittings, we adopt customized wooden case packaging for enhanced protection; large-diameter products are fixedly packed with professional pallets to avoid extrusion and damage. Clear, unified labels are attached to the outer packaging for quick product identification, quantity checking and inventory management. Strict operational and transportation protection measures are implemented throughout the whole process to deliver intact products to customers.

Quality Inspection Procedures

We implement full-process quality inspection for all finished products, taking stainless steel equal tees as a standard inspection example:

Visual inspection of product surface to ensure no cracks, pits, oxidation and other appearance defects

Verification of product marking information (e.g. 3″ SCH80S ASTM A403 WP304 ASME B16.9 ZZ815) to ensure complete and accurate parameter identification

Precision dimensional detection, including outer diameter, overall length and wall thickness, to ensure full compliance with standard tolerances

Stainless Steel Butt Weld Fittings VS Socket Weld Fittings