Amardeep Steel Center is a globally recognized manufacturer, supplier, and exporter of superior-grade Stainless Steel 347H Buttweld Fittings. Engineered specifically for the most demanding high-temperature applications, our fittings are the industry benchmark for structural integrity and long-term reliability. We maintain an extensive inventory of ASTM A403 WP347H fittings, which are distinguished by a higher carbon content and niobium stabilization, providing exceptional creep resistance and immunity to intergranular corrosion. Our unwavering commitment to quality ensures that every SS 347H pipe fitting we produce delivers robust, predictable performance under extreme thermal stress.
For critical systems where high-temperature strength is non-negotiable, Amardeep Steel Center is your definitive source for certified, high-performance piping solutions.
What Are Stainless Steel 347H Buttweld Fittings?
Stainless Steel 347H Buttweld Fittings are specialized piping components designed to connect, divert, or terminate pipe runs in systems operating at elevated temperatures. These fittings, which include elbows, tees, and reducers, are joined to pipes via butt welding to form a continuous, leak-proof structure. The "347H" designation (UNS S34709) identifies a high-carbon variant of the standard 347 stainless steel grade, making it a powerhouse for high-heat environments.
The defining characteristic of high temp 347H stainless steel fittings is their controlled carbon content, which is maintained in a higher range of 0.04% to 0.10%. Like the standard Grade 347, these fittings are stabilized with Niobium (Nb) to prevent chromium carbide precipitation at the grain boundaries when exposed to temperatures in the sensitization range (427°C - 816°C). However, the elevated carbon content in the "H" grade significantly enhances the material's mechanical properties at high temperatures.
This results in substantially improved creep strength and higher stress rupture properties, making 347H Stainless Steel Pipe Fittings the premier choice for applications involving prolonged exposure to temperatures above 538°C (1000°F). While standard 347 fittings are excellent for intermittent high-temperature service, SS 347H BW fittings are engineered to maintain their strength and structural integrity under continuous thermal and mechanical stress, ensuring long-term operational safety and reliability.
Table of Contents
- Stainless Steel 347H Buttweld Fittings Specifications
- Chemical Composition & Mechanical Properties of Stainless Steel 347H Buttweld Fittings
- Mechanical Properties of Stainless Steel 347H Buttweld Fittings
- Heat Treatment & Tolerances of Stainless Steel 347H Buttweld Fittings
- Dimensional Tolerances of Stainless Steel 347H Buttweld Fittings
- Types & Forms of Stainless Steel 347H Buttweld Fittings
- Applications & Industries Served of Stainless Steel 347H Buttweld Fittings
- Why Choose Amardeep Steel for Stainless Steel 347H Buttweld Fittings?
- Related Products
- Get a Competitive Price
Stainless Steel 347H Buttweld Fittings Specifications
Our entire range of ASME B16.9 WP347H Butt Weld Fittings is manufactured and rigorously tested to comply with and exceed international standards, guaranteeing performance, safety, and seamless integration.
|
Specification |
Details |
|---|---|
|
Specifications |
ASTM A403 / ASME SA403 |
|
Grade |
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 347H Buttweld Fittings
The exceptional resilience of UNS S34709 butt weld fittings is a direct function of their precisely controlled chemical composition and the robust mechanical properties it delivers, especially under thermal stress.
Chemical Composition (wt %)
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Nb + Ta |
|---|---|---|---|---|---|---|---|---|
|
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 347H 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) |
95 Max |
|
Density |
7.96 g/cm³ |
|
Melting Point |
1398 - 1446 °C (2550 - 2635 °F) |
Heat Treatment & Tolerances of Stainless Steel 347H Buttweld Fittings
Every fitting we produce is subjected to exacting process controls to ensure optimal metallurgical properties and precise dimensional accuracy for flawless installation.
Heat Treatment Requirements of Stainless Steel 347H Buttweld Fittings
To achieve their signature high-temperature strength, Stainless Steel 347H Buttweld Fittings undergo a specific heat treatment. They are solution-annealed at a high temperature, typically between 1093°C and 1149°C (2000°F and 2100°F), followed by rapid cooling. This high-temperature anneal ensures that the higher carbon content is fully dissolved into the austenitic matrix, which is essential for maximizing the material's creep strength and stress rupture properties during service.
Dimensional Tolerances of Stainless Steel 347H Buttweld Fittings
We manufacture all our fittings in strict accordance with the dimensional tolerances set forth in ASME B16.9. This standard meticulously defines the geometry of the fittings, including crucial parameters like center-to-face dimensions, overall size, angularity, and the bevel of the welding ends. Adherence to these precise tolerances is paramount, as it guarantees a perfect fit-up in the field, simplifying the welding process, reducing installation costs, and ensuring the final pipeline is free from alignment-induced stresses.
Types & Forms of Stainless Steel 347H Buttweld Fittings
Amardeep Steel Center stocks a comprehensive portfolio of SS 347H pipe fittings to accommodate any conceivable piping design.
- SS 347H 90° & 45° Elbows (LR/SR): For executing standard directional changes in high-temperature systems.
- SS 347H Equal & Reducing Tees: For creating 90-degree branches from a main pipe run.
- SS 347H Concentric & Eccentric Reducers: For smoothly connecting pipes of different diameters while maintaining optimal flow characteristics.
- SS 347H End Caps: To provide a secure, permanent termination for a high-temperature pipeline.
- SS 347H Stub Ends (Lap Joints): Used with lap joint flanges to create a cost-effective, easily alignable flanged connection.
- SS 347H Pipe Bends: Custom-fabricated bends (e.g., 3D, 5D, 10D) for applications requiring gradual flow changes to minimize pressure drop and erosion.
- SS 347H Crosses: Four-way fittings used for creating intersecting pipe runs.
Applications & Industries Served of Stainless Steel 347H Buttweld Fittings
The superior high-temperature capabilities of ASTM A403 WP347H fittings make them indispensable in the most severe service industries:
- Petrochemical and Refining: The material of choice for radiant superheaters, boiler tubes, high-temperature heat exchanger tubes, and fluid catalytic cracking (FCC) units.
- Power Generation: Essential for high-pressure steam headers and steam lines in fossil fuel, waste-to-energy, and nuclear power plants.
- Aerospace: Used in aircraft exhaust stacks, collector rings, and jet engine components that must withstand extreme thermal cycling.
- Chemical Processing: In high-temperature reactors, thermal oxidizers, and piping systems handling corrosive media at elevated temperatures.
- Industrial Furnaces: For manufacturing furnace parts, burners, and structural components that require long-term strength at high heat.
Why Choose Amardeep Steel for Stainless Steel 347H Buttweld Fittings?
- Manufacturing Excellence: Our integrated manufacturing process gives us complete control from start to finish. We ensure every Stainless Steel 347H Buttweld Fitting is produced with consistent wall thickness, a superior finish, and full adherence to all metallurgical and dimensional standards.
- Global Exports: We are a trusted exporter with a robust logistics network serving clients in the USA, Canada, UAE, Saudi Arabia, Europe, and Southeast Asia. Our expertise in international trade ensures a smooth, on-time delivery experience.
- Fast Turnaround: We maintain a vast ready-to-ship inventory of standard 347H Stainless Steel Pipe Fittings. This allows us to fulfill urgent orders and keep your critical projects on schedule.
- Certified Quality: As an ISO 9001:2015 certified manufacturer, quality is the cornerstone of our business. All our fittings are supplied with a comprehensive EN 10204 3.1 Material Test Certificate (MTC). We also coordinate with third-party inspection agencies like TUV, DNV, and Lloyd’s to meet any specific client requirements.
- Technical Support: Our team of seasoned metallurgists and engineers provides 24/7 technical support. We assist with material selection, application analysis, and any technical queries, positioning ourselves as your long-term partner, not just a supplier.
Related Products
- 347/347H Pipe Fittings
- Stainless Steel 347 Forged Fittings
- Stainless Steel 347H Forged Fittings
- Stainless Steel 347 Buttweld Fittings
Get Your Stainless Steel 347H Buttweld Fittings Price
Ready to equip your high-temperature project with the most reliable fittings on the market? Contact Amardeep Steel Center today for a fast, no-obligation quote. Our expert sales team will provide a competitive price and a detailed delivery schedule for your Stainless Steel 347H Buttweld Fittings.
Frequently Asked Questions (FAQ's)
1. What is the main difference between 347H and 321H fittings?
Both are high-carbon, stabilized grades for high-temperature service. The key difference is the stabilizing element: 347H uses Niobium (Columbium), while 321H uses Titanium. Niobium offers slightly better high-temperature strength and corrosion resistance, particularly in highly oxidizing environments, and is less prone to being lost during the welding process, making 347H a premium choice for the most critical applications.
2. Can I use 347H fittings if my operating temperature is only moderately high?
Yes, you can. 347H will perform excellently at moderate temperatures, offering the same resistance to sensitization as standard 347. However, its primary advantage (and associated cost) comes from its superior creep strength at temperatures above 538°C (1000°F). For service below this range, the standard 347 grade may be a more economical choice.
3. Is it possible for these fittings to be dual-certified as 347/347H?
Yes, this is quite common. If the raw material's carbon content falls within the overlapping range (0.04% to 0.08%) and it meets the mechanical properties of both grades, it can be dual-certified. This provides greater flexibility for use across a wider range of applications.
4. What welding practices are recommended for SS 347H BW fittings?
These fittings have excellent weldability. It is recommended to use a stabilized filler metal to ensure the weld deposit also has good high-temperature properties. AWS E/ER 347 is the most commonly used filler metal, as the niobium stabilizer transfers effectively across the welding arc.
5. Do you provide complete documentation with your fittings?
Absolutely. Every order of Stainless Steel 347H Buttweld Fittings we supply comes with a full EN 10204 3.1 Material Test Certificate (MTC). This document provides full traceability, detailing the material's heat number, chemical analysis, mechanical test results, and confirmation of compliance with the ordered specifications.
