Amardeep Steel Center is a distinguished manufacturer, supplier, and exporter of premium Stainless Steel 347 Buttweld Fittings. Engineered for superior resilience in high-temperature and corrosive environments, our fittings are the benchmark for reliability in critical applications. We provide a comprehensive inventory of ASTM A403 WP347 fittings, stabilized with Niobium (Columbium) to deliver exceptional resistance to intergranular corrosion and enhanced creep strength. Our commitment to metallurgical excellence ensures that every SS 347 pipe fitting we produce offers unparalleled durability and performance.
When your project demands a robust solution that can withstand extreme heat and aggressive media, trust Amardeep Steel Center for certified quality and unwavering service.
What Are Stainless Steel 347 Buttweld Fittings?
Stainless Steel 347 Buttweld Fittings are essential piping components used to modify a pipeline's direction, create branches, or connect pipes of varying sizes. They are joined using butt welding, creating a strong, monolithic structure with the same integrity as the pipe itself. The defining characteristic of Grade 347 Buttweld Fittings (UNS S34700) is their chemical stabilization with Niobium (Nb), also known as Columbium (Cb).
This stabilization is critical for high-temperature applications. Standard austenitic stainless steels, like Grade 304, are susceptible to sensitization when exposed to temperatures between 427°C and 816°C (800°F - 1500°F). In this range, chromium carbides can form at the grain boundaries, depleting the surrounding area of chromium and making it vulnerable to intergranular corrosion.
ASTM A403 WP347 fittings solve this problem. Niobium has a stronger affinity for carbon than chromium. It preferentially forms stable Niobium Carbides (NbC), effectively "locking up" the carbon and preventing the formation of harmful chromium carbides. This leaves the chromium free to maintain its protective passive layer, ensuring the material remains corrosion-resistant even after welding or exposure to high-temperature cycles. This makes SS 347 butt weld fittings an excellent choice for heavy welded equipment that cannot be post-weld annealed and for service in demanding thermal conditions.
Table of Contents
- Stainless Steel 347 Buttweld Fittings Specifications
- Chemical Composition & Mechanical Properties of Stainless Steel 347 Buttweld Fittings
- Mechanical Properties of Stainless Steel 347 Buttweld Fittings
- Heat Treatment & Tolerances of Stainless Steel 347 Buttweld Fittings
- Dimensional Tolerances of Stainless Steel 347 Buttweld Fittings
- Types & Forms of Stainless Steel 347 Buttweld Fittings
- Applications & Industries Served of Stainless Steel 347 Buttweld Fittings
- Why Choose Amardeep Steel for Stainless Steel 347 Buttweld Fittings?
- Related Products
- Get a Competitive Price
Stainless Steel 347 Buttweld Fittings Specifications
Our complete range of ASME B16.9 WP347 butt weld fittings is manufactured and rigorously inspected to meet and exceed international standards, guaranteeing safety, performance, and interchangeability.
|
Specification |
Details |
|---|---|
|
Specifications |
ASTM A403 / ASME SA403 |
|
Grade |
WP347 (UNS S34700), WP347H (UNS S34709) |
|
Dimensions |
ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, MSS-SP-79 |
|
Size Range |
1/2" NB to 48" NB |
|
Type |
Seamless / Welded / Fabricated |
|
Wall Thickness |
Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
|
Bending Radius |
R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
|
Testing |
100% Radiography Testing, PMI, Hardness Test, Hydrostatic Testing |
Chemical Composition & Mechanical Properties of Stainless Steel 347 Buttweld Fittings
The exceptional performance of UNS S34700 butt weld fittings in high-stress, high-temperature environments is a direct result of their carefully engineered chemical balance and robust mechanical properties.
Chemical Composition (wt %)
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Nb + Ta |
|---|---|---|---|---|---|---|---|---|
|
SS 347 |
0.08 max |
2.0 max |
0.75 max |
0.045 max |
0.030 max |
17.0 - 19.0 |
9.0 - 13.0 |
≥ 10 x C |
|
SS 347H |
0.04 - 0.10 |
2.0 max |
0.75 max |
0.045 max |
0.030 max |
17.0 - 19.0 |
9.0 - 13.0 |
≥ 8 x C |
Mechanical Properties of Stainless Steel 347 Buttweld Fittings
|
Property |
Typical Value |
|---|---|
|
Tensile Strength |
515 MPa (75,000 psi) |
|
Yield Strength (0.2% Offset) |
205 MPa (30,000 psi) |
|
Elongation in 2" |
40% |
|
Hardness (Rockwell B) |
92 Max |
|
Density |
8.0 g/cm³ |
|
Melting Point |
1398 - 1446 °C (2550 - 2635 °F) |
Heat Treatment & Tolerances of Stainless Steel 347 Buttweld Fittings
We employ precise process controls to ensure every fitting has the optimal metallurgical structure and dimensional accuracy for superior performance and ease of installation.
Heat Treatment Requirements of Stainless Steel 347 Buttweld Fittings
To achieve their full potential, Stainless Steel 347 Buttweld Fittings undergo specific heat treatments. They are typically supplied in the solution-annealed condition, which involves heating to a temperature between 1010°C and 1120°C (1850°F and 2050°F), followed by rapid quenching. This process dissolves any existing carbides and relieves internal stresses. For maximum resistance to intergranular corrosion, a stabilization heat treatment may be performed at 870-900°C (1600-1650°F). This step precipitates the niobium carbides, fully stabilizing the material before it enters service. High temp SS 347H fittings are annealed at higher temperatures to ensure the higher carbon content is put into solution for optimal creep strength.
Dimensional Tolerances of Stainless Steel 347 Buttweld Fittings
Every fitting we manufacture adheres strictly to the dimensional tolerances defined in ASME B16.9. This crucial standard governs the geometry, including center-to-face dimensions, angles, and weld bevels. Strict conformance to these tolerances is essential for ensuring a seamless fit-up on site, which simplifies welding, reduces installation time, and eliminates potential stress points in the finished piping system.
Types & Forms of Stainless Steel 347 Buttweld Fittings
Amardeep Steel Center offers a complete portfolio of SS 347 pipe fittings to meet the design requirements of any piping system.
- SS 347 90° & 45° Elbows (LR/SR): For creating standard directional changes in high-temperature pipelines.
- SS 347 Equal & Reducing Tees: To create 90-degree branches of either the same or a smaller diameter from the main run.
- SS 347 Concentric & Eccentric Reducers: To smoothly connect pipes of different sizes, ensuring efficient flow.
- SS 347 End Caps: To provide a permanent, robust seal at the termination point of a pipeline.
- SS 347 Stub Ends (Lap Joints): Used with lap joint flanges for an economical flanged connection that allows for easy rotational alignment.
- SS 347 Pipe Bends: Custom-fabricated bends (3D, 5D, 10D) designed for applications requiring gradual flow changes to minimize pressure drop and erosion.
- SS 347 Crosses: Four-way fittings used for intersecting pipe runs.
Applications & Industries Served of Stainless Steel 347 Buttweld Fittings
The unique properties of ASTM A403 WP347 fittings make them the preferred choice for a wide array of severe service industries:
- Petrochemical and Refining: Extensively used in high-temperature reactor tubing, fluid catalytic cracking (FCC) units, and equipment exposed to polythionic acid stress corrosion cracking (PASCC).
- Power Generation: Ideal for high-pressure steam lines, boiler tubes, superheater and reheater tubes, and headers in fossil fuel and nuclear power plants.
- Aerospace: Used in aircraft exhaust systems, collector rings, and cabin heaters where high-temperature strength and oxidation resistance are crucial.
- Chemical Processing: In vessels, reactors, and piping handling hot, corrosive chemicals.
- Waste Heat Recovery: For components in systems that capture and reuse high-temperature exhaust gases.
- Industrial Furnaces and Kilns: For structural components, burners, and linings exposed to extreme heat.
Why Choose Amardeep Steel for Stainless Steel 347 Buttweld Fittings?
- Manufacturing Excellence: Our integrated manufacturing facilities give us complete control over the production cycle, from raw material inspection to the final finishing of every Stainless Steel 347 Buttweld Fitting. This ensures unparalleled quality, consistent wall thickness, and a flawless surface finish.
- Global Exports: As a leading exporter, we have a proven history of serving a diverse clientele across the USA, Canada, UAE, Saudi Arabia, Europe, and Southeast Asia. Our logistics team ensures a smooth and efficient procurement experience, regardless of your location.
- Fast Turnaround: We maintain a massive inventory of standard Stainless Steel 347 butt weld fittings in all common sizes and schedules, ready for immediate dispatch to meet even the most demanding project timelines.
- Certified Quality: We are an ISO 9001:2015 certified manufacturer, and quality is at the core of our operations. All fittings come with a comprehensive EN 10204 3.1 Material Test Certificate (MTC). We also facilitate third-party inspections from reputable agencies like TUV, DNV, and Lloyd’s to meet any client requirement.
- Technical Support: Our team of experienced metallurgists and engineers is available 24/7 to provide expert guidance. From material selection to application design and troubleshooting, we are committed to being more than just a supplier—we are your technical partner.
Related Products
- 347/347H Pipe Fittings
- Stainless Steel 347 Forged Fittings
- Stainless Steel 347H Forged Fittings
- Stainless Steel 347H Buttweld Fittings
Get Your Stainless Steel 347 Buttweld Fittings Price
Ready to specify the best in high-temperature performance for your project? Contact Amardeep Steel Center today for a fast, no-obligation quote. Our dedicated sales team will provide a competitive price and a detailed delivery schedule for your Stainless Steel 347 Buttweld Fittings.
Frequently Asked Questions (FAQ's)
1. What is the primary difference between SS 347 and SS 321 fittings?
Both are stabilized grades, but SS 347 is stabilized with Niobium (Columbium), while SS 321 is stabilized with Titanium. Niobium provides superior high-temperature strength and better corrosion resistance in strongly oxidizing environments. The weldability of 347 is also considered slightly better, as niobium is less prone to being lost in the welding arc.
2. What is the difference between SS 347 and SS 347H?
The "H" in 347H denotes a higher carbon content (0.04% - 0.10%). This increased carbon provides significantly better creep resistance and strength at temperatures above 538°C (1000°F). While both are stabilized, 347H is the preferred choice for long-term, high-stress, high-temperature structural applications.
3. Are these fittings suitable for welding?
Yes, Grade 347 Buttweld Fittings have excellent weldability. They are designed to be welded without losing their corrosion resistance. The recommended filler metal is typically AWS E/ER 347, which contains niobium to stabilize the weld deposit.
4. Can I use these fittings in radioactive service?
While excellent for high-temperature service, Grade 347 is generally not recommended for nuclear or radioactive applications. The tantalum (Ta) that is naturally present with niobium can become highly radioactive with a long half-life. For such applications, Grade 321 is often preferred.
5. Do you supply Material Test Certificates (MTCs) with your fittings?
Absolutely. Every order of Stainless Steel 347 Buttweld Fittings dispatched from Amardeep Steel Center is accompanied by a full EN 10204 3.1 MTC. This document provides complete traceability and certifies the material's chemical composition, mechanical properties, and compliance with all ordered specifications.
