At Amardeep Steel Center, we specialize in manufacturing, supplying, and exporting premium Stainless Steel 321H Buttweld Fittings, the ultimate solution for high-temperature structural stability. Engineered for superior performance in environments where heat and corrosion pose a constant challenge, our ASTM A403 WP321H fittings are renowned for their exceptional creep strength and resistance to intergranular corrosion. As a leading stockist, we provide a complete range of SS 321H pipe fittings, each piece rigorously tested to ensure it meets the highest standards of quality and durability for your most critical applications.
Trust Amardeep Steel Center to deliver certified, high-carbon, titanium-stabilized piping components that offer unparalleled reliability when temperatures rise.
What Are Stainless Steel 321H Buttweld Fittings?
Stainless Steel 321H Buttweld Fittings are specialized piping components designed for use in elevated-temperature environments. These fittings—including elbows, tees, reducers, and caps—are joined to pipes using a butt-welding process, which creates a robust and continuous connection. The "321H" designation (UNS S32109) signifies a unique variant of the titanium-stabilized 321 grade, engineered specifically for enhanced performance at high temperatures.
The key distinction of high temperature 321H stainless fittings lies in their controlled, higher carbon content, typically ranging from 0.04% to 0.10%. While the standard 321 grade is stabilized with titanium to prevent chromium carbide formation at the grain boundaries (sensitization), the "H" grade leverages this higher carbon content to deliver significantly improved high-temperature mechanical properties. This results in superior creep resistance and higher stress rupture strength, making 321H Stainless Steel Pipe Fittings the ideal choice for applications operating consistently above 538°C (1000°F).
In essence, while both 321 and 321H grades are stabilized against intergranular corrosion, the SS 321H butt weld fittings are purpose-built to maintain their structural integrity and strength under the prolonged stress of extreme heat, a domain where standard austenitic grades would weaken and fail.
Table of Contents
- Stainless Steel 321H Buttweld Fittings Specifications
- Chemical Composition & Mechanical Properties of Stainless Steel 321H Buttweld Fittings
- Mechanical Properties of Stainless Steel 321H Buttweld Fittings
- Heat Treatment & Tolerances of Stainless Steel 321H Buttweld Fittings
- Dimensional Tolerances of Stainless Steel 321H Buttweld Fittings
- Types & Forms of Stainless Steel 321H Buttweld Fittings
- Applications & Industries Served of Stainless Steel 321H Buttweld Fittings
- Why Choose Amardeep Steel for Stainless Steel 321H Buttweld Fittings?
- Related Products
- Get a Competitive Price
Stainless Steel 321H Buttweld Fittings Specifications
Our inventory of ASME B16.9 WP321H Butt Weld Fittings is manufactured and rigorously tested to comply with all relevant international standards, ensuring safety, reliability, and seamless integration into your piping systems.
|
Specification |
Details |
|---|---|
|
Specifications |
ASTM A403 / ASME SA403 |
|
Grade |
WP321H (UNS S32109) |
|
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 |
Radiography Testing (RT), Positive Material Identification (PMI), Hardness Test |
Chemical Composition & Mechanical Properties of Stainless Steel 321H Buttweld Fittings
The remarkable performance of UNS S32109 butt weld fittings stems from their precisely controlled chemistry and the robust mechanical properties it imparts, especially at elevated temperatures.
Chemical Composition (wt %)
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Ti |
|---|---|---|---|---|---|---|---|---|
|
SS 321H (UNS S32109) |
0.04 - 0.10 |
2.0 max |
0.75 max |
0.045 max |
0.030 max |
17.0 - 19.0 |
9.0 - 12.0 |
≥ 4 x C |
Mechanical Properties of Stainless Steel 321H 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" |
35% |
|
Hardness (Brinell) |
217 Max |
|
Density |
7.92 g/cm³ |
|
Melting Point |
1398 - 1446 °C (2550 - 2635 °F) |
Heat Treatment & Tolerances of Stainless Steel 321H Buttweld Fittings
Every fitting we produce undergoes meticulous process controls to guarantee optimal metallurgical structure and precise dimensional accuracy for hassle-free installation.
Heat Treatment Requirements of Stainless Steel 321H Buttweld Fittings
To achieve the desired high-temperature properties, Stainless Steel 321H Buttweld Fittings are subjected to a specific heat treatment protocol. The fittings are solution-annealed at a temperature of 1040-1150°C (1900-2100°F), followed by rapid quenching. This process dissolves carbides, refines the grain structure, and ensures the material is in its optimal state for high-temperature service. Unlike the standard 321 grade, a lower-temperature stabilization anneal is generally avoided for the 321H grade, as it is intended for use in the temperature range where its superior creep strength is the primary requirement.
Dimensional Tolerances of Stainless Steel 321H Buttweld Fittings
We enforce strict adherence to the dimensional tolerances outlined in ASME B16.9 for all our fittings. This specification governs critical parameters such as center-to-face dimensions, overall geometry, angularity, and the bevel for welding. Conforming to these tolerances is non-negotiable, as it guarantees a perfect fit-up during field installation, simplifies the welding process, and ensures the structural integrity of the completed pipeline
Types & Forms of Stainless Steel 321H Buttweld Fittings
Amardeep Steel Center provides a comprehensive selection of SS 321H pipe fittings to meet any and all project design requirements.
- SS 321H 90° & 45° Elbows (Long & Short Radius): For making standard directional changes in high-temperature piping.
- SS 321H Equal & Reducing Tees: To create perpendicular branches from the main pipe run.
- SS 321H Concentric & Eccentric Reducers: To connect pipes of different diameters while maintaining flow efficiency.
- SS 321H End Caps: For providing a secure and permanent termination to a pipe run.
- SS 321H Stub Ends (Lap Joints): Used with lap joint flanges to facilitate easy alignment and provide a cost-effective flanged connection in high-temperature systems.
- SS 321H Pipe Bends (3D, 5D, etc.): Custom-fabricated bends for gradual flow changes, minimizing turbulence and pressure loss.
- SS 321H Crosses: Four-way fittings for creating intersecting piping networks.
Applications & Industries Served of Stainless Steel 321H Buttweld Fittings
The unique high-temperature strength of ASTM A403 WP321H fittings makes them essential for the most demanding industries:
- Petrochemical & Refining: Critical for furnace components, radiant superheaters, catalytic cracking units, and high-temperature heat exchangers where creep strength is paramount.
- Power Generation: Used in fossil fuel and nuclear power plants for high-pressure steam lines, headers, and superheater and reheater tubing.
- Aerospace: Essential for manufacturing jet engine parts, afterburners, exhaust manifolds, and cabin heaters that experience extreme temperatures.
- Chemical Processing: In thermal oxidizers, kilns, and reactors that operate at elevated temperatures with corrosive media.
- Waste Incineration: For components in waste-to-energy plants that must withstand high heat and corrosive flue gases.
- Industrial Furnaces: Used for furnace linings, burners, and other high-temperature structural components.
Why Choose Amardeep Steel for Stainless Steel 321H Buttweld Fittings?
- Manufacturing Excellence: Our state-of-the-art production facility grants us complete oversight of the manufacturing process. From raw material verification to the final quality checks, we ensure every Stainless Steel 321H Buttweld Fitting offers consistent quality, dimensional accuracy, and superior finish.
- Global Exports: We are a trusted exporter with a robust supply chain serving clients across the USA, Canada, UAE, Saudi Arabia, Europe, and Southeast Asia. Our expertise in international logistics and documentation ensures a seamless and timely delivery experience.
- Fast Turnaround: We maintain a vast, ready-to-ship inventory of standard 321H Stainless Steel Pipe Fittings. This allows us to fulfill urgent orders and support tight project schedules, minimizing downtime for our clients.
- Certified Quality: As an ISO 9001:2015 certified manufacturer, our commitment to quality is absolute. All fittings are supplied with a full EN 10204 3.1 Material Test Certificate (MTC). We also facilitate third-party inspections from world-renowned agencies like TUV, DNV, and Lloyd’s to meet client-specific requirements.
- Technical Support: Our team of metallurgists and engineers is available around the clock to provide expert technical assistance. We help our clients with material selection, design optimization, and application challenges, acting as a true partner in their success.
Related Products
- 321/321H Pipe Fittings
- Stainless Steel 321 Forged Fittings
- Stainless Steel 321H Forged Fittings
- Stainless Steel 321 Buttweld Fittings
Get Your Stainless Steel 321H Buttweld Fittings Price
Ready to secure high-performance fittings for your high-temperature application? Contact Amardeep Steel Center today for a prompt, no-obligation quote. Our experienced sales team will provide a competitive price and a delivery plan for your Stainless Steel 321H Buttweld Fittings.
Frequently Asked Questions (FAQ's)
1. What is the key advantage of 321H over standard 321?
The main advantage is superior high-temperature strength. The higher carbon content (0.04-0.10%) in 321H provides significantly better creep resistance and stress rupture properties, making it the superior choice for applications operating continuously above 538°C (1000°F).
2. Can 321H fittings be used at lower temperatures?
Yes, 321H can be used at lower temperatures and will provide the same excellent resistance to intergranular corrosion as the standard 321 grade. However, it is primarily specified for its high-temperature benefits, and for lower temperature service (below 538°C), the standard 321 grade is often more cost-effective.
3. When should I use 321H fittings instead of 347H fittings?
Both 321H (titanium-stabilized) and 347H (niobium-stabilized) offer excellent high-temperature performance. 347H is generally considered to have slightly better high-temperature strength and corrosion resistance, particularly in strongly oxidizing environments. However, 321H is often more readily available and can be a more economical choice for many high-temperature applications.
4. Is it possible for these fittings to be dual-certified as 321/321H?
Yes, it is common for plate and other raw materials to meet the chemical and mechanical requirements of both grades. If the carbon content falls within the 0.04-0.08% range and the material meets the strength requirements, it can be dual-certified. This offers flexibility in application.
5. What is the recommended filler metal for welding SS 321H butt weld fittings?
For welding 321H, it is recommended to use a filler metal that is also stabilized and designed for high-temperature service. AWS E/ER 347 is the most common choice, as the niobium in the filler metal effectively transfers across the weld arc and provides stabilization to the weld deposit.
