Stainless Steel 347 and 347H are columbium-stabilized austenitic stainless steels with superior intergranular corrosion resistance and excellent performance in high-temperature applications. These grades are often chosen over 321 stainless steel in environments requiring enhanced corrosion resistance. The addition of columbium and tantalum improves stability against carbide precipitation, making 347 and 347H suitable for demanding environments.
The range of 347/347H stainless steel fittings includes reducers, elbows, tees, crosses, end caps, stub ends, and pipe bends. Each fitting is manufactured in compliance with ASTM A-403, ANSI B16.9/16.28, and MSS SP-43 standards, with Welding Bevel Standards as per ANSI B 16.25. Custom and standard sizes are available, accommodating bending radii from 1D to 10D for various applications.
In-stock availability ensures quick delivery, and custom sizes of large-diameter, radiography-tested 347/347H elbows, reducers, tees, and fabricated pipes are available for specialized projects.
These grades of stainless steel offer enhanced high-temperature properties, better creep resistance, and intergranular corrosion protection compared to standard grades like 304 or 316. Grade 347H, the high-carbon version, provides added strength at elevated temperatures.
- High Temperature Creep Resistance: Excellent in extreme heat environments.
- Enhanced Intergranular Corrosion Resistance: Superior to standard austenitic grades.
- Outstanding Corrosion Resistance in Oxidizing Environments: Performs well in high-stress chemical environments.
- Non-Magnetic in Annealed Condition: Can only be hardened by cold working.
- Furnace parts
- Pressure vessels and tanks
- Industrial boilers
- Pulp and paper processing equipment
- Heat exchanger tubes
- High temperature chemical processing equipment
- Oil and petrochemical refineries
| Specification | ASTM A182 / A403 & ASME SA182 / SA403 |
| Type | Seamless / Welded / Fabricated |
| Variants | 347, 347H |
| 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. |
| Products | Size | |
| SS 347 Elbows – Long Radius | SS 347 Stub Ends | Sizes 1/2″ – 48″ |
| SS 347 Elbows – Short Radius | SS 347 Crosses | |
| SS 347 Reducing Elbows | SS 347 Reducing Crosses | |
| SS 347 45° Elbows | SS 347 180° LR Return Bends | |
| SS 347 Tees | SS 347 180° SR Return Bends | |
| SS 347 Fabricated Tees | SS 347 Pipe Bends / Piggable Bends | |
| SS 347 Reducers | SS 347 Couplings | |
| SS 347 Concentric Reducers | SS 347 Pipe Nipples | |
| SS 347 Eccentric Reducers | SS 347 Forged/Plate Cut Rings | |
| SS 347 3D Elbow | SS 347 End Caps | |
| SS 347 5D Elbow | SS 347 Forged / Plate Circles | |
| Products | Size | |
| SS 347 90° Elbows | SS 347 Couplings | Sizes 1/8″ – 4″ Pressure Ratings – |
| SS 347 45° Elbows | SS 347 Reducers | |
| SS 347 Street Elbows | SS 347 Inserts | |
| SS 347 Tees | SS 347 Caps | |
| SS 347 Crosses | SS 347 Unions | |
| Specification | ASTM A182 / A240 & ASME SA182 / SA240 |
| Grade | 347, 347H |
| 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. |
Each fitting is carefully packaged in sturdy wooden cases for transit, with standard markings including grade, lot number, size, and degree. Custom markings are available upon request to meet specific requirements.
All 347/347H fittings and flanges are rigorously inspected at each production stage, ensuring compliance with ASTM, ASME, MSS, DIN, EN, and JIS standards. Certified inspection agencies are available on request to verify material and dimensional conformity.
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-grade 347/347H stainless steel pipe fittings tailored to your project needs, reach out to our team today. Our experts are available to assist in selecting the right fittings to ensure durability, safety, and high performance in demanding applications.
Products
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