Amardeep Steel Center is a premier manufacturer, supplier, and exporter of high-performance 347/347H Pipe Fittings. Engineered with columbium (niobium) as a stabilizing agent, our fittings are designed to provide exceptional reliability in high-temperature environments where intergranular corrosion is a major concern. We produce a full range of Stainless Steel 347 Pipe Fittings and Stainless Steel 347H Pipe Fittings, all manufactured to the highest international standards, including ASTM A403.
For critical applications in petroleum refineries, power generation, and chemical processing, our fittings deliver the superior strength and stability needed for long-term, safe operation at elevated temperatures.
What Are 347/347H Pipe Fittings?
347/347H Pipe Fittings are specialized components used to connect, control, and branch piping systems that operate at high temperatures. Their key feature is the addition of columbium (Cb) and tantalum (Ta) as stabilizing elements. Much like titanium in Grade 321, these elements prevent chromium carbide precipitation at the grain boundaries when the steel is exposed to temperatures in the sensitization range (427°C to 816°C). This makes stabilized stainless steel 347 pipe fittings immune to intergranular corrosion, a common failure mode for other stainless steels in high-heat applications.
The two variants in this family are tailored for specific high-temperature roles:
- Stainless Steel 347 Pipe Fittings (SS 347 Pipe Fittings): This is the standard stabilized grade, offering excellent corrosion resistance after exposure to high temperatures. It is a reliable choice for a wide range of heat-intensive applications.
- Stainless Steel 347H Pipe Fittings (SS 347H Pipe Fittings): The 'H' indicates a higher carbon content. This formulation provides 347H high-temperature fittings with superior creep strength and higher stress rupture properties, making them the ideal choice for structural and pressure applications at temperatures above 538°C (1000°F).
These fittings are manufactured under standards such as ASTM A403, with designations like ASTM A403 WP347 fittings and ASTM A403 WP347H fittings, ensuring they meet the stringent requirements for high-temperature pressure vessel and piping codes.
Table of Contents
- 347/347H Pipe Fittings Specifications
- Chemical Composition & Mechanical Properties of 347/347H Pipe Fittings
- Mechanical Properties of 347/347H Pipe Fittings
- Heat Treatment & Tolerances of 347/347H Pipe Fittings
- Dimensional Tolerances of 347/347H Pipe Fittings
- Types & Forms of 347/347H Pipe Fittings
- Applications & Industries Served of 347/347H Pipe Fittings
- Why Choose Amardeep Steel for 347/347H Pipe Fittings?
- Related Products
- Get a Competitive Price
347/347H Pipe Fittings Specifications
At Amardeep Steel Center, every one of our 347 stainless steel pipe fittings is produced to precise specifications. This commitment to accuracy ensures full compliance with global engineering standards and guarantees a perfect, reliable fit for your critical systems.
|
Specification |
Details |
|---|---|
|
Standard |
ASTM A403 / ASME SA403 |
|
Grades |
WP347, WP347H |
|
Types |
Seamless / Welded / Fabricated |
|
Buttweld Fittings Size |
1/2" to 48" |
|
Forged Fittings Size |
1/4” to 4” |
|
Bending Radius |
R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
|
Wall Thickness / Schedule |
Sch 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS |
|
Pressure Class (Forged) |
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS |
|
Dimensions |
ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, MSS SP-75 |
Chemical Composition & Mechanical Properties of 347/347H Pipe Fittings
The outstanding performance of our fittings is rooted in their carefully controlled chemical makeup and robust mechanical properties. We conduct rigorous testing on every production batch to ensure it meets all required specifications.
Chemical Composition (wt %)
The addition of Columbium (Niobium) + Tantalum is the key to this alloy's high-temperature stability.
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Cb + Ta |
|---|---|---|---|---|---|---|---|---|
|
SS 347 (WP347) |
0.08 max |
2.00 max |
0.75 max |
0.045 max |
0.030 max |
17.0-19.0 |
9.0-13.0 |
10 x C min |
|
SS 347H (WP347H) |
0.04-0.10 |
2.00 max |
0.75 max |
0.045 max |
0.030 max |
17.0-19.0 |
9.0-13.0 |
8 x C min |
Mechanical Properties of 347/347H Pipe Fittings
These properties demonstrate the material's ability to withstand pressure and physical stress during operation.
|
Grade |
Tensile Strength (min) |
Yield Strength (min) |
Elongation in 2" (min) |
Hardness (max) |
|---|---|---|---|---|
|
ksi (MPa) |
ksi (MPa) |
% |
Rockwell B |
|
|
WP347/347H |
75 (515) |
30 (205) |
35 |
95 |
Heat Treatment & Tolerances of 347/347H Pipe Fittings
The final quality and performance of a fitting are determined by two critical manufacturing processes: heat treatment and dimensional control.
Heat Treatment Requirements of 347/347H Pipe Fittings
All our 347/347H Pipe Fittings are supplied in a stabilized annealed condition. This heat treatment involves heating the fittings to a temperature of 1010°C to 1120°C (1850°F to 2050°F) and then rapidly cooling them. This process relieves manufacturing stresses and ensures the columbium carbide is properly distributed, which is essential for providing maximum resistance to intergranular corrosion during high-temperature service.
Dimensional Tolerances of 347/347H Pipe Fittings
A precise fit is crucial for the integrity of any piping system. We manufacture our fittings to the strict dimensional tolerances of ASME B16.9 (for buttweld fittings) and ASME B16.11 (for forged fittings). This guarantees that every dimension is accurate, allowing for easy installation and a reliable, leak-proof connection.
Types & Forms of 347/347H Pipe Fittings
As a leading manufacturer, Amardeep Steel Center produces a comprehensive range of 347H stainless steel fittings to meet any project specification.
- Elbows (45°, 90°, 180°): For making smooth directional changes in pipelines.
- Tees (Equal & Reducing): For creating 90-degree branches from a main line.
- Reducers (Concentric & Eccentric): For connecting pipes of two different diameters.
- Caps: To provide a secure and permanent seal at the end of a pipe.
- Stub Ends: Used with lap joint flanges to create an economical flanged connection.
- Pipe Bends: Custom-fabricated bends with larger radii for gradual turns.
- Couplings, Nipples, and Crosses: A full suite of components for any connection need.
Applications & Industries Served of 347/347H Pipe Fittings
The unique high-temperature properties of SS 347H Pipe Fittings make them essential for a variety of critical industries:
- Petroleum Refining: For fluid catalytic cracking (FCC) units, polythionic acid service, and high-temperature process piping.
- Power Generation: In boiler tubes, superheaters, and steam pipes.
- Chemical Processing: For equipment that operates within the carbide precipitation temperature range.
- Aerospace: For aircraft collector rings, exhaust manifolds, and jet engine parts.
- Heat Exchangers: For high-temperature shell and tube exchangers.
- Furnaces: For radiant superheaters, furnace parts, and other high-heat components.
Why Choose Amardeep Steel for 347/347H Pipe Fittings?
When you choose Amardeep Steel, you are selecting a supplier that is fully committed to quality, reliability, and customer satisfaction. Here’s why we are the right partner for you:
- Manufacturing Excellence: Our in-house manufacturing gives us complete control over the production process, from raw material to the finished product. This guarantees consistent wall thickness, a superior surface finish, and adherence to the strictest quality standards.
- Global Exports: As a trusted exporter, we have a proven track record of serving customers in major international markets, including the USA, Canada, UAE, Saudi Arabia, Europe, and Southeast Asia. Our expert logistics team ensures timely and secure delivery.
- Fast Turnaround: We maintain a large stock of standard 347/347H Pipe Fittings, ready for immediate shipment. This allows us to meet urgent requirements and keep your projects on track.
- Certified Quality: Quality is not just a promise; it's our guarantee. We are an ISO 9001:2015 certified company, and all our fittings are supplied with a Mill Test Certificate (MTC) as per EN 10204 3.1. We also facilitate third-party inspections from reputable agencies like TUV, DNV, and Lloyd’s.
- Technical Support: Our team of expert metallurgists and engineers is available 24/7 to provide technical assistance. Whether you need guidance on material selection or application-specific designs, we are here to help you find the perfect solution.
Related Products
- Stainless Steel 347 Butt weld Fittings
- Stainless Steel 347H Butt weld Fittings
- Stainless Steel 347 Forged Fittings
- Stainless Steel 347H Forged Fittings
Get Your 347/347H Pipe Fittings Price
Ready to order your 347/347H Pipe Fittings? Get a competitive price from an industry leader you can depend on. Contact our sales team today for a fast, no-obligation quote and let us supply the high-performance fittings your project needs.
Frequently Asked Questions (FAQ's)
1. What is the difference between Grade 347 and Grade 321 stainless steel?
Both are stabilized austenitic stainless steels, but they use different stabilizing elements. Grade 321 uses titanium, while Grade 347 uses columbium (niobium) and tantalum. Grade 347 is often considered superior in strongly oxidizing environments and has better high-temperature strength and creep resistance.
2. Why should I use 347H instead of 347?
You should choose 347H stainless steel fittings for applications that require maximum strength and creep resistance at temperatures above 538°C (1000°F). The higher carbon content in the 347H grade provides these enhanced mechanical properties at elevated temperatures.
3. Are these fittings resistant to polythionic acid stress corrosion cracking?
Yes. Grade 347 is known for its excellent resistance to polythionic acid stress corrosion cracking (PASCC), which can occur in refinery equipment during shutdowns. This makes it a preferred material for many applications in the petroleum refining industry.
4. Can Grade 347/347H fittings be welded?
Yes, both grades are readily weldable using standard fusion and resistance welding techniques. Due to the stabilizing elements, a post-weld heat treatment is not required to restore their resistance to intergranular corrosion.
5. What certifications do you provide with your fittings?
We supply a Mill Test Certificate (MTC) in accordance with EN 10204 3.1 with every order. This certificate provides full traceability and documents the material's precise chemical composition and mechanical properties, confirming that it meets all required standards.
