321/321H Pipe Fittings
Stainless Steel 321 (1.4541) and 321H (1.4878) are titanium-stabilized austenitic stainless steels, designed for high-temperature applications and improved resistance to intergranular corrosion. Known for their excellent oxidation and creep resistance, these grades are well-suited for use in environments where Type 304 may not suffice. The titanium addition prevents carbide precipitation, enhancing durability and performance during welding.
Comprehensive Range of 321/321H Pipe Fittings
A full selection of 321 and 321H stainless steel fittings is available, including reducers, elbows, tees, crosses, end caps, stub ends, and pipe bends. These products meet ASTM A-403, ANSI B16.9/16.28, and MSS SP-43 standards, with Welding Bevel Standards per ANSI B 16.25 for precise installation and functionality. Custom and standard sizes are offered with bending radii from 1D to 10D to suit various project needs.
Additionally, ex-stock availability of 321/321H pipe fittings and flanges allows for prompt delivery. Large-diameter, radiography-tested SS 321 elbows, reducers, tees, and custom-fabricated pipes are also available for specialized industrial applications.
Why Choose Stainless Steel 321 and 321H?
Stainless Steel 321 is an 18/8 alloy with titanium, making it ideal for applications involving elevated temperatures. The titanium addition minimizes carbide precipitation, reducing the risk of intergranular corrosion during welding. Type 321H, the high-carbon version, is preferred when enhanced strength at high temperatures is required.
Key Properties of Stainless Steel 321 Pipe Fittings, SS 321 Flanges
- High Oxidation Resistance: Effective in high-temperature environments.
- Excellent Corrosion Resistance: Ideal for chemical and industrial applications.
- Good Creep Strength: Maintains stability under high-stress conditions.
- Enhanced Resistance to Organic and Inorganic Chemicals: Reliable in demanding chemical environments.
- Improved Resistance to Intergranular Corrosion: Titanium addition reduces carbide precipitation.
Applications of 321/321H Stainless Steel Fittings and Flanges
- Oil refinery equipment
- Pressure Vessels
- Industrial Boilers
- Chemical and pharmaceutical equipment
- Chemical process heat exchangers
- Petrochemical refineries
SS 321 Pipe Fittings Production Range
| Specification | ASTM A182 / A403 & ASME SA182 / SA403 |
| Type | Seamless / Welded / Fabricated |
| Variants | 321, 321H |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Range | ½”NB to 48”NB in Sch 10s, 40s, 80s, 160s, XXS. |
| Dimensions | ANSI/ASME B16.9, B16.28, MSS-SP-43. |
Buttweld Stainless Steel 321 Pipe Fittings Seamless/ Welded 100% Radiography Tested
| Products | Size | |
| SS 321 Elbows – Long Radius | SS 321 Stub Ends | Sizes 1/2″ – 48″ |
| SS 321Elbows – Short Radius | SS 321 Crosses | |
| SS 321 Reducing Elbows | SS 321 Reducing Crosses | |
| SS 321 45° Elbows | SS 321 180° LR Return Bends | |
| SS 321 Tees | SS 321 180° SR Return Bends | |
| SS 321 Fabricated Tees | SS 321 Pipe Bends / Piggable Bends | |
| SS 321 Reducers | SS 321 Couplings | |
| SS 321 Concentric Reducers | SS 321 Pipe Nipples | |
| SS 321 Eccentric Reducers | SS 321 Forged/Plate Cut Rings | |
| SS 321 3D Elbow | SS 321 End Caps | |
| SS 321 5D Elbow | SS 321 Forged / Plate Circles | |
High Pressure Forged 321 Pipe Fittings Threaded and Socket Weld Pipe Fittings
| Products | Size | |
| SS 321 90° Elbows | SS 321 Couplings | Sizes 1/8″ – 4″ Pressure Ratings – |
| SS 321 45° Elbows | SS 321 Reducers | |
| SS 321 Street Elbows | SS 321 Inserts | |
| SS 321 Tees | SS 321 Caps | |
| SS 321 Crosses | SS 321 Unions | |
Stainless Steel 321/321H Flanges Forged and Plate Flanges
| Specification | ASTM A182 / A240 & ASME SA182 / SA240 |
| Grade | 321, 321H |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Size | 1/8” to 36″ |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Product | Size | |
| SS 321 Slip-On Flanges | SS 321 Threaded Flanges | 1/8″ – 36″ Raised Face or Flat Face |
| SS 321 Weld Neck Flanges | SS 321 Socket Weld Flanges | |
| SS 321 Blind Flanges | SS 321 Reducing Flanges | |
| SS 321 Lap Joint Flanges | SS 321 Plate Flanges | |
Marking & Packing
Each fitting is carefully packaged to prevent transit damage, with export packaging in robust wooden cases. Standard markings indicate grade, lot number, size, and degree, with custom markings available upon request for added traceability.
Quality Assurance
All 321/321H fittings and flanges undergo thorough inspection throughout the manufacturing process, adhering to ASTM, ASME, MSS, DIN, EN, and JIS standards. Certified inspection agencies can be engaged upon request to verify material and dimensional compliance.
Test Certificates Provided:
- Manufacturer Test Certificate (EN 10204 / 3.1B)
- Raw Materials Certificate
- 100% Radiography Test Report
- Third-Party Inspection Report (available upon request)
For top-quality Stainless Steel 321/321H pipe fittings, customized to meet your specific project needs, contact our team today. Our experts are ready to assist you in selecting the right fittings to ensure long-lasting performance and safety in your applications.
FAQ's
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Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry