Views: 3 Author: Site Editor Publish Time: 2025-06-20 Origin: Site
Stainless steel butt weld pipe fittings are connecting components widely used in piping systems, primarily joining two pipe sections by welding. These fittings are ingeniously designed to ensure the stability and sealing of the joint, thereby playing a critical role in a wide range of industrial environments.
Butt weld pipe fittings are especially suited for highpressure pipelines and other demanding applications that require precise dimensions and high pressure resistance—such as petrochemical, pharmaceutical, power generation, aerospace, military, fire protection, metallurgy, shipbuilding, gas, nuclear power, and environmentalprotection systems.
Shanghai Zhucheng Pipe Fittings Manufacturing Co., Ltd. specializes in producing and fabricating a comprehensive range of stainless steel butt weld pipe fittings, steel pipes, steel plates, flanges, and bolts & nuts. Our products are widely applied across numerous sectors—from precision machinery manufacturing and cozy home décor to cuttingedge aerospace industries. Thanks to our exceptional product quality and versatile adaptability, we have become a trusted partner in many fields. In addition to our extensive standard offerings, we also provide customized fabrication services tailored to your exact requirements, ensuring every project meets your expectations precisely.
High strength and sealing: Butt weld connections ensure that the pipeline remains stable and reliable when subjected to high pressure, high temperature and impact, and prevents leakage.
Smooth internal flow path: The internal surface is continuous and smooth after welding, which minimizes fluid turbulence and pressure drop and improves transportation efficiency.
Space saving: Compared with flange connections, butt weld connections are more compact and help optimize pipeline layout space.
Long-term reliability: Once the welding is completed, the connection is permanent, providing long-term operational reliability and reducing maintenance requirements.
Size Range | 1/2" - 80" / DN15 - 2000 |
Thickness Schedule | SCH 10, 20, 40, STD, XS, 80, 100, 120, 140, 160, XXS |
Standard | ANSI / ASME B16.9, MSS SP 43, JIS B2311/2312/2313, EN10253 |
Stainless Steel Grades | ASTM A403 WP304/304L/304H, 316/316L, 310S, 317, 347, 904L |
CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr |
ASTM A403 WP304 | MIN | 8.0 | 18.0 | |||||
MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 | |
ASTM A403 WP304L | MIN | 8.00 | 18.00 | |||||
MAX | 0.03 | 2.00 | 0.05 | 0.03 | 1.00 | 12.00 | 20.00 |
MATERIAL | ASTM A403 WP304 | ASTM A403 WP304L |
T.S (MPA) | 515 min | 485 min |
Y.S (MPA) | 205 min | 170 min |
EL % | 28 min | 28 min |
Elbow
Elbows are among the most commonly used fittings in a piping system, primarily employed to change the direction of flow. They are joined to pipe or other fittings by butt-welding to create a seamless, strong, and leak-resistant assembly. Butt weld elbows are typically classified by their center-to-end radius into Long-Radius (LR) and Short-Radius (SR) types, and by angle (90° or45°). They see widespread use in critical industries such as oil & gas, petrochemical, and power generation.
Tee
Butt weld tees are T-shaped fittings used to branch off or combine flow in the main line. Welded directly to the pipe at all three ends, they form a robust, sealed, and continuous structure that prevents leaks under high-pressure, high-temperature, or corrosive service. Tees are available as Equal-Diameter (all three ports the same size) or Reducing (branch port smaller than run) and are ubiquitous in oil & gas, chemical, power, and general industrial piping.
Cross
Butt weld crosses are special fittings shaped like a “+,” used to connect four pipes at a single junction, allowing fluid to split or combine in four directions. Each of the four outlets can be the same or different diameter, and all connections are made by butt-welding to ensure a strong, leak-proof piping network.
Reducer (Concentric & Eccentric)
Also called butt weld reducers, these fittings join two pipes of different diameters to achieve a smooth transition of flow and pressure in the system. They weld directly to the pipes via beveled ends, providing a flush, leak-tight joint that minimizes turbulence. Concentric reducers have both pipe centerlines aligned (ideal for vertical runs), while eccentric reducers offset one centerline (preferred in horizontal piping to avoid air pockets or fluid accumulation).
Cap
Butt weld caps are end-of-line fittings used to close off the end of a pipeline. Unlike threaded or socket-weld caps, they have no internal threads or sockets; instead, they weld directly to the pipe via a beveled end, creating a seamless, highly sealed termination. This arrangement guarantees structural integrity, high strength, and excellent leak resistance, even under high-pressure, high-temperature, or corrosive conditions.
Elbow
Tee
Cross
Reducer
Cap
TOLERANCES FOR BW FITTINGS | |||||||||||||
Nominal Size | All Fittings | 45°&90° Elbows |
| 180° | Caps | Reducers & Lap Joint | Lap Joint Stub Ends | ||||||
DN | NPS | OD 3) 4) | ID 3) | A B C M | A B |
| K | U | E, E1 | H F |
| R | t |
15-65 | 1/2 -21/2 | +1.6 | ± 0.8 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 3 | ± 2 | 0 | 0 | +1.6 |
80-90 | 3-31/2 | ± 1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 3 | ± 2 | 0 | 0 | +1.6 |
100 | 4 | ± 1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 3 | ± 2 | 0 | 0 | +1.6 |
125-200 | 5-8 | +2.4 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 6 | ± 2 | 0 | 0 | +1.6 |
250-450 | 10-18 | +4.0 | ± 3.2 | ± 2 | ± 3 | ± 10 | ± 6 | ± 2 | ± 6 | ± 2 | 0 | 0 | +3.2 |
500-600 | 20-24 | +6.4 | ± 4.8 | ± 2 | ± 3 | ± 10 | ± 6 | ± 2 | ± 6 | ± 2 | 0 | 0 | +3.2 |
650-750 | 26-30 | +6.4 | ± 4.8 | ± 3 | ± 6 | --- | --- | --- | ± 10 | ± 5 | --- | --- | --- |
800-1200 | 32-48 | +6.4 | ± 4.8 | ± 5 | ± 6 | --- | --- | --- | ± 10 | ± 5 | --- | --- | --- |
1300-1500 | 52-60 | +6.4 | ± 4.8 | ± 5 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
1600-1700 | 64-68 | +6.4 | ± 4.8 | ± 5 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
1800-2000 | 72-80 | +6.4 | ± 4.8 | ± 5 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
Excellent Tightness: Welded connections virtually eliminate leaks.
Strength and Durability: Withstands high pressure, temperature and mechanical stress.
Corrosion Resistance: Suitable for harsh environments including corrosive chemicals, seawater and high purity systems.
Hygienic Properties: Smooth, non-porous surfaces and seamless connections prevent bacterial growth for sanitary applications.
Optimized Fluid Flow: Smooth internal surfaces reduce turbulence and pressure drop.
Long Service Life: Reduces maintenance and replacement costs.
Chemical and Petrochemical Industries
Oil and Gas Industries
Power Generation
Food and Beverage Processing
Pharmaceutical and Biotechnology
Marine and Shipbuilding
Water Treatment Plants
Pulp and Paper Industry
Cryogenic Applications
ASTM A403 WP304 butt weld pipe fittings and socket weld fittings differ primarily in how they join to pipe: buttweld fittings have beveled ends that are butted endtoend with the pipe and joined by a fullpenetration groove weld, yielding a smooth bore, highstrength, leakresistant connection ideal for larger diameters and highpressure or corrosive services; socketweld fittings, by contrast, feature a socket into which the plainend pipe is inserted and then joined with a fillet weld around the outside, offering easier alignment and assembly on smallerdiameter lines (typically NPS ≤ 2") but introducing a slight internal crevice and generally lower pressure ratings compared to fullpenetration butt welds.
