Shivalik Forge And Fittings

SS 321 Buttweld Fittings

Buttweld Pipe fittings are essential components used in piping systems to connect, control, or change the direction of the flow of fluids or gasses. They provide a secure and reliable joint between pipes, ensuring the smooth operation of various industrial processes. Pipe fittings come in different shapes, sizes, and materials to accommodate specific requirements and applications.

What are Buttweld Fittings?

Buttweld fittings are a type of pipe fitting that is welded to the end of pipes or tubes to create a strong and leak-free connection. They are designed to provide a smooth and continuous flow path, minimizing turbulence and pressure drop in the piping system. Buttweld fittings offer excellent structural integrity and are commonly used in high-pressure and high-temperature applications.

Buttweld fittings offer several advantages:

Strength and Durability: The butt welding technique used in buttweld fittings provides a robust and long-lasting connection. The welded joint has the same strength as the pipes themselves, ensuring the integrity and reliability of the piping system.

Leak Resistance: The seamless welded joint in buttweld fittings eliminates the potential for leaks, making them suitable for applications requiring a tight and leak-proof seal. This is especially important in industries where fluid or gas leakage can lead to safety hazards or loss of product.

Smooth Flow Characteristics: Buttweld fittings create a smooth, uninterrupted flow path within the piping system. The absence of protrusions or internal crevices minimizes pressure drop and turbulence, allowing for efficient fluid or gas transport.

Compatibility: Buttweld fittings are compatible with various pipe materials and can be used with pipes made from metals such as stainless steel, carbon steel, and alloy steel, as well as non-metallic materials like PVC and HDPE.

Applications of Buttweld Fittings

Stainless Steel 321 buttweld fittings find extensive applications in various industries, including:
Stainless Steel 321 Buttweld Fittings copy 3

Specifications of Buttweld Fittings

Specifications ASTM A403/ ASME SA403
Size 1/8 NB to 48 NB (Seamless, 100% X-Ray Welded, Fabricated)
Standards ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Thickness 5s, 10s, 40s, 80s, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS with NACE Mr 01-75
Types Seamless, Welded and Fabricated

Mechanical Specification of Stainless Steel 321 Buttweld Fittings

Stainless Steel 321 is a titanium-stabilized austenitic stainless steel that offers exceptional resistance to high temperatures and corrosion. The mechanical specifications of Stainless Steel 321 buttweld fittings may vary depending on the specific product and standard, but some general specifications include:


Stainless Steel 304, 1.307, UNS S30400

Tensile Strength

Minimum 515-730 megapascals

Yield Strength

Minimum 205-275 MPa


Brinell Hardness of 217 max



These specifications ensure that Stainless Steel 321 buttweld fittings possess the necessary strength and durability to withstand challenging operating conditions and environments.

How Stainless Steel 321 Benefits the Quality of Buttweld Fittings

Stainless Steel 321 offers several advantages that enhance the quality and performance of buttweld fittings:

High Temperature Resistance: Stainless Steel 321 is specifically designed to withstand high temperatures up to 870°C (1600°F). It retains its strength and mechanical properties even in elevated temperature applications, making it suitable for industries such as aerospace, power generation, and heat exchangers.

Corrosion Resistance: Stainless Steel 321 exhibits excellent resistance to corrosion, particularly in environments containing organic acids and oxidizing agents. This corrosion resistance ensures the longevity and reliability of buttweld fittings, even in aggressive chemical environments.

Weldability: Stainless Steel 321 offers good weldability, allowing for easy and reliable welding of buttweld fittings to pipes or tubes. The welding process results in strong and leak-free joints, ensuring the integrity of the piping system.

Oxidation Resistance: Stainless Steel 321 contains titanium, which forms a stable oxide layer on the surface of the metal. This oxide layer acts as a barrier, providing enhanced resistance to oxidation and preventing the formation of scales, thereby maintaining the performance of buttweld fittings over time.

Types of Stainless Steel 321 Buttweld Fittings

Stainless 321/321H Steel SS 321 45 Degree Elbow 321 SS 90 Degree Elbow 321H Stainless Steel 45 Degree Elbow SS UNS S32100 45 Degree Elbow SS WERKSTOFF NR. 1.4541 45 Degree Elbow ASME SA403 321H 90 Degree Elbow
Stainless Steel 321/321H Pipe Fittings SS 321 Pipe Fittings 321H SS Buttweld Fitting 321 Stainless Steel Pipe Fitting SS UNS S32100 Buttweld Fitting SS WERKSTOFF NR. 1.4541 Pipe Fittings ASTM A403 321H Stainless Steel Buttweld Fitting
Stainless Steel 321/321H Eccentric Reducer SS 10d Pipe Bend SS 321 Eccentric Reducer 321H SS Eccentric Reducer 32H1 Stainless Steel Eccentric Reducer SS UNS S32100 Eccentric Reducer SS WERKSTOFF NR. 1.4541 Eccentric Reducer ASTM A403 WP 321 Stainless Steel Eccentric Reducer
Stainless Steel 321/321H Concentric Reducer SS 321 Concentric Reducer 321 SS Concentric Reducer 321H Stainless Steel Concentric Reducer SS UNS S32100 Concentric Reducer SS WERKSTOFF NR. 1.4541 Concentric Reducer ANSI B16.9 WP 321 Stainless Steel Concentric Reducer
Stainless Steel 321/321H Lateral Tee SS 321 Lateral Tee 321H SS Lateral Tee 321 Stainless Steel Lateral Tee SS UNS S32100 Lateral Tee SS WERKSTOFF NR. 1.4541 Lateral Tee ASME B16.28 WP 321 Stainless Steel Lateral Tee
Stainless Steel 321/321H Equal Tee SS 321 Equal Tee 321H SS Equal Tee 321 Stainless Steel Equal Tee SS UNS S32100 Equal Tee SS WERKSTOFF NR. 1.4541 Equal Tee ASTM A403 Stainless Steel Equal Tee
Stainless Steel 321/321H Long Stub End SS 321H Long Stub End 321 SS Long Stub End 321H Stainless Steel Long Stub End SS UNS S32100 Long Stub End SS WERKSTOFF NR. 1.4541 Long Stub End ASTM A403 WP 321 Stainless Steel Long Stub End
Stainless Steel 321/321H Short Stub End SS 321H Short Stub End 321 SS Short Stub End 321H Stainless Steel Short Stub End SS UNS S32100 Short Stub End SS WERKSTOFF NR. 1.4541 Short Stub End MSS-SP-43 Stainless Steel Short Stub End
Stainless Steel 321/321H End Cap SS 321H End Cap 321 SS End Cap 321H Stainless Steel End Cap SS UNS S32100 End Cap SS WERKSTOFF NR. 1.4541 End Cap ASTM A403 321 Stainless Steel End Cap
Stainless Steel 321/321H Bend SS 321 Pipe Bend 321H SS Pipe Bend 321 Stainless Steel Bend SS UNS S32100 Bend SS 5d Pipe Bend SS WERKSTOFF NR. 1.4541 Bend ASTM A403 Stainless Steel Bend
Stainless Steel 321/321H Equal Cross SS 321H Equal Cross 321 SS Equal Cross 321 Stainless Steel Equal Cross SS UNS S32100 Equal Cross SS WERKSTOFF NR. 1.4541 Equal Cross ANSI B16.9 WP 321 Stainless Steel Equal Cross

SS 321/321H Pipe Fittings Chemical Composition

Grade C Mn Si P S Cr N Ni Ti
SS 321 0.08 max 2.0 max 1.0 max 0.045 max 0.030 max 17.00 – 19.00 0.10 max 9.00 – 12.00 5(C+N) – 0.70 max
SS 321H 0.04 – 0.10 2.0 max 1.0 max 0.045 max 0.030 max 17.00 – 19.00 0.10 max 9.00 – 12.00 4(C+N) – 0.70 max

Stainless Steel 321/321H Buttweld Fittings Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1457 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %

Equivalent Grades for 321/321H Stainless Steel Pipe Fitting

SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9

Types of Buttweld Fittings

shivalik offers a comprehensive range of Stainless Steel 321 buttweld fittings, including:

Buttweld Elbows: Elbows are used to change the direction of the pipeline. They are available in different angles, such as 45 degrees, 90 degrees, and 180 degrees, to accommodate specific piping configurations.

Buttweld Tees: Tees are used to create a branch connection in a pipeline. They have an inlet and two outlets, allowing for the diversion of fluid or gas flow.

Buttweld Reducers: Reducers are used to connect pipes of different diameters. They ensure a smooth transition between different pipe sizes while maintaining the flow characteristics of the system.

Buttweld Caps: Caps are used to close the ends of pipes, providing protection and preventing the entry of foreign materials. They are often used in applications where pipe ends need to be sealed temporarily or permanently.

Buttweld Stub Ends: Stub ends are used in conjunction with lap joint flanges to create a connection that allows for easy dismantling and alignment of the piping system.

These are just a few examples of the types of Stainless Steel 321 buttweld fittings available. shivalik offers a wide variety of sizes, configurations, and custom options to meet the specific needs of different industries and applications.

Why shivalik is the Best Manufacturer and Supplier of Buttweld Fittings

shivalik is a renowned manufacturer and supplier of Stainless Steel 321 buttweld fittings, offering unparalleled quality and service. Here’s why they are the preferred choice:

Premium Quality: shivalik is committed to delivering superior quality products that meet international standards. Their Stainless Steel 321 buttweld fittings undergo rigorous quality checks to ensure flawless performance and durability.

Customization Options: shivalik understands that every project has unique requirements. They provide customization options for dimensions, materials, and finishes, allowing customers to tailor the buttweld fittings to their specific needs.

Wide Range of Products: shivalik offers an extensive range of Stainless Steel 321 buttweld fittings, covering various sizes, types, and configurations. This ensures that customers can find the right fitting for their specific application.

Technical Expertise: With years of experience in the industry, shivalik possesses deep technical knowledge and expertise in buttweld fittings. They provide valuable support and guidance to customers, helping them select the most suitable products for their projects.

Timely Delivery: shivalik understands the importance of timely project completion. They have efficient logistics and supply chain management systems in place to ensure prompt delivery of orders, minimizing project delays.

Choose shivalik as your trusted manufacturer and supplier of Stainless Steel 321 buttweld fittings, and experience top-quality products, customization options, technical expertise, and reliable service for all your piping system needs.

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