ASTM A403 WP321 Fittings - Manufacturer of Stainless Steel 321h Buttweld Fittings in India

Supplier of ASME SA403 SS 321 Pipe Fittings | UNS S32100/ S32109 Elbow, Tee, Reducer, WNR 1.4541 Stub End, Cross, DIN 1.4878 Cap, Pipe Bends At Competitive Price - 1/2" to 72" Inch as per ASTM A403

At Prime Steel, we take immense pride in being a leading manufacturer and supplier of high-quality stainless steel pipe fittings, specializing in the production of top-notch components crafted from the resilient alloy, stainless steel 321/321H. Our unwavering commitment to excellence and precision has positioned Prime Steel as a reliable partner for industries that prioritize durability and resilience in their piping systems.

Product Details

  • Type: Buttweld Pipe Fittings

  • Material: Stainless Steel

  • ASTM: A403/SA403

  • Grade: 321/321h

  • UNS: S32100/ S32109

  • WERKSTOFF: 1.4541/ 1.4878

Specifications of SS 321 Buttweld Pipe Fittings

Standards 01

ASTM A403 WP321 / ASME SA403 WP321h


Size range 02

Seamless Fittings: 1/2" - 24"
Welded Fittings: 4" - 72"

DIMENSIONS 04

ASME/ ANSI B16.9 | ASME B16.28 | MSS-SP-43 | BS1560 | BS4504 | BS10

Types / Form 03

Seamless, Welded & Fabricated / Elbow, Tee, Reducer, Stub End, Cross, Cap


Wall Thickness / Schedules 03

5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, Sch XXS

APPLICATIONS 06

oil and gas, petrochemicals, power generation, marine and food & beverage process lines, and water treatment

About Stainless Steel 321/321h Pipe Fittings?

Stainless Steel 321/321H Pipe Fittings are critical components in the construction and maintenance of piping systems, designed specifically from the high-quality alloy, stainless steel 321/321H. These fittings play a crucial role in industries where corrosion resistance, high-temperature performance, and durability are paramount.

Stainless Steel 321/321H Pipe Fittings are integral components in constructing robust and corrosion-resistant piping systems for various industrial applications, offering a reliable solution for the transport of fluids and gases in demanding environments.

The main difference between Stainless Steel 321 and 321H lies in their carbon content. While 321 has a lower carbon content (0.08% maximum), 321H has a higher carbon content (0.04-0.10%). The higher carbon content in 321H provides improved high-temperature strength, making it suitable for applications involving extended exposure to elevated temperatures.

Stainless Steel 321

  • Composition: Stainless Steel 321 typically contains around 17-19% chromium, 9-12% nickel, and 0.08% carbon. It also includes titanium as a stabilizing element. The titanium content provides resistance to carbide precipitation during welding, reducing the risk of sensitization.

  • Characteristics:

    • Corrosion Resistance: Stainless Steel 321 offers excellent corrosion resistance, particularly in environments where the temperature ranges from 800 to 1500°F (427 to 816°C).
    • High-Temperature Performance: It maintains its strength and corrosion resistance at elevated temperatures, making it suitable for applications in the aerospace, chemical, and petrochemical industries.

Stainless Steel 321H

  • Composition: Stainless Steel 321H is a higher carbon version of 321, containing a minimum of 0.04% carbon. The increased carbon content provides improved high-temperature strength.

  • Characteristics:

    • Corrosion Resistance: Similar to 321, Stainless Steel 321H exhibits excellent corrosion resistance, particularly in high-temperature environments.
    • High-Temperature Performance: The higher carbon content enhances its high-temperature strength, making it suitable for applications involving prolonged exposure to elevated temperatures.

Types of SS 321 Pipe Fittings

Check ANSI B16.28 / ASME B16.9 Buttweld Pipe Fittings Dimensions Download

Equivalent Grades of SS 321 Buttweld Pipe Fittings

STANDARD WERKSTOFF NR. UNS JIS EN
SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9

Chemical Composition of Stainless Steel 321h Pipe Fittings

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

Mechanical Composition of SS 321 Buttweld Fittings

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 %

A403 WP321h Elbow

A403 WP321H Elbow is a specific type of pipe fitting crafted from the stainless steel alloy A403 WP321H, as outlined by ASTM (American Society for Testing and Materials) standards. This designation provides essential information about the material, grade, and type of elbow, offering reliability and performance in various industrial applications.

A403 WP321 Tee

A403 WP321 Tee fittings play a vital role in piping systems, allowing for the branching of pipelines in three directions. Whether in chemical processing, petrochemicals, power generation, or aerospace, these tees offer reliable solutions where corrosion resistance and high-temperature performance are crucial. Adhering to standardized specifications ensures the consistent quality and performance of A403 WP321 Tee fittings, making them integral components in diverse industrial settings.

A403 WP321 Cross

A403 WP321 Cross fittings play a crucial role in the construction and maintenance of piping systems, allowing for the branching of pipelines in four directions. Whether in chemical processing, petrochemicals, power generation, or aerospace, these crosses offer reliable solutions where corrosion resistance and high-temperature performance are paramount. Adhering to standardized specifications ensures the consistent quality and performance of A403 WP321 Cross fittings, making them integral components in diverse industrial settings.

A403 WP321h Reducer

A403 WP321H Reducer is a specific type of pipe fitting crafted from the stainless steel alloy A403 WP321H. This designation adheres to ASTM (American Society for Testing and Materials) specifications, providing essential information about the material, grade, and type of reducer fitting. A403 WP321H is an austenitic stainless steel alloy with a higher carbon content, known for its corrosion resistance and enhanced high-temperature strength.

A403 WP321h Cap

A403 WP321H Cap fittings play a crucial role in piping systems, providing a reliable means to seal the ends of pipes. Whether in chemical processing, petrochemicals, power generation, or aerospace, these caps offer dependable solutions where corrosion resistance, high-temperature performance, and enhanced strength under heat are essential. Adhering to standardized specifications ensures the consistent quality and performance of A403 WP321H Cap fittings, making them integral components in diverse industrial settings.

Stainless Steel 321H has a higher carbon content compared to 321, providing enhanced high-temperature strength, making it suitable for applications involving prolonged exposure to elevated temperatures.

A403 refers to the ASTM specification covering wrought austenitic stainless steel pipe fittings. A403 WP321H indicates a specific type of fitting made from Stainless Steel 321H.

Advantages include excellent corrosion resistance, high-temperature performance, durability, and reliability in challenging conditions.

the choice between 304 and 321 depends on the specific requirements of the application, including environmental conditions, temperature, and performance expectations. Consulting with materials engineers or industry experts can help determine the most suitable alloy for a particular use case.

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