Amardeep Steel Center stands as a premier manufacturer, supplier, and exporter of high-performance Stainless Steel 904L Buttweld Fittings. As a leading authority in super austenitic steel solutions, we provide an extensive inventory of fittings engineered to excel in the most aggressive corrosive environments where standard stainless steel grades are inadequate. Our ASTM A403 WP904L fittings are meticulously produced to offer superior resistance to strong reducing acids, pitting, and stress corrosion cracking. This unwavering commitment to quality ensures every SS 904L pipe fitting we deliver provides a robust, leak-proof, and exceptionally durable solution for your most critical industrial applications.
When your system demands the ultimate defense against corrosion, trust Amardeep Steel Center for certified quality, technical expertise, and unparalleled service.
What Are Stainless Steel 904L Buttweld Fittings?
Stainless Steel 904L Buttweld Fittings are elite piping components designed for use in systems handling severely corrosive media. These fittings—including elbows, tees, reducers, and caps—are joined to pipes through butt welding, a method that creates a strong, homogenous, and leak-proof connection that becomes an integral part of the pipeline. The true power of these fittings comes from their material: Grade 904L (UNS N08904), a low-carbon, high-alloy, non-stabilized austenitic stainless steel, often referred to as a "super-austenitic" grade.
The chemistry of 904L Butt Weld Fittings is specifically designed to outperform conventional stainless steels like 316L in harsh conditions. Key elements in their formulation include:
- High Nickel (23-28%): Provides excellent resistance to chloride-induced stress corrosion cracking (SCC).
- High Chromium (19-23%): Forms a stable, passive layer for general corrosion resistance.
- High Molybdenum (4-5%): Significantly enhances resistance to pitting and crevice corrosion, particularly in chloride-rich environments.
- Copper Addition (1-2%): This is the game-changer, giving UNS N08904 butt weld fittings outstanding resistance to strong reducing acids, most notably sulfuric acid, which is highly aggressive to most other stainless steels.
The low carbon content ensures excellent weldability, preventing carbide precipitation and intergranular corrosion in the heat-affected zone of the weld without requiring post-weld annealing. In short, Stainless Steel 904L Fittings are the go-to solution for applications where the corrosion resistance of standard grades is insufficient.
Table of Contents
- Stainless Steel 904L Buttweld Fittings Specifications
- Chemical Composition & Mechanical Properties of Stainless Steel 904L Buttweld Fittings
- Mechanical Properties of Stainless Steel 904L Buttweld Fittings
- Heat Treatment & Tolerances of Stainless Steel 904L Buttweld Fittings
- Dimensional Tolerances of Stainless Steel 904L Buttweld Fittings
- Types & Forms of Stainless Steel 904L Buttweld Fittings
- Applications & Industries Served of Stainless Steel 904L Buttweld Fittings
- Why Choose Amardeep Steel for Stainless Steel 904L Buttweld Fittings?
- Related Products
- Get a Competitive Price
Stainless Steel 904L Buttweld Fittings Specifications
Our complete range of ASME B16.9 904L fittings is manufactured and rigorously inspected in compliance with all relevant international standards, guaranteeing safety, reliability, and perfect compatibility.
|
Specification |
Details |
|---|---|
|
Specifications |
ASTM A403 / ASME SA403, ASTM B366 / ASME SB366 |
|
Grade |
WP904L (UNS N08904) |
|
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 904L Buttweld Fittings
The elite performance of our SS 904L butt weld fittings is a direct function of their carefully balanced chemistry and the robust mechanical properties it delivers.
Chemical Composition (wt %)
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
Cu |
|---|---|---|---|---|---|---|---|---|---|
|
SS 904L (UNS N08904) |
0.02 max |
2.0 max |
1.0 max |
0.045 max |
0.035 max |
19.0 - 23.0 |
4.0 - 5.0 |
23.0 - 28.0 |
1.0 - 2.0 |
Mechanical Properties of Stainless Steel 904L Buttweld Fittings
|
Property |
Typical Value |
|---|---|
|
Tensile Strength |
490 MPa (71,000 psi) |
|
Yield Strength (0.2% Offset) |
220 MPa (32,000 psi) |
|
Elongation in 2" |
35% |
|
Hardness (Rockwell B) |
90 Max |
|
Density |
7.95 g/cm³ |
|
Melting Point |
1300 - 1390 °C (2372 - 2534 °F) |
Heat Treatment & Tolerances of Stainless Steel 904L Buttweld Fittings
Every fitting we produce undergoes meticulous process controls to guarantee optimal metallurgical structure and precise dimensional accuracy for flawless installation.
Heat Treatment Requirements of Stainless Steel 904L Buttweld Fittings
To achieve maximum corrosion resistance, all our Stainless Steel 904L Buttweld Fittings are supplied in the solution-annealed condition. This critical heat treatment involves heating the material to a temperature between 1090°C and 1175°C (2000°F and 2150°F), followed by a rapid quench, typically in water. This process dissolves any harmful intermetallic precipitates that could compromise corrosion resistance and ensures a homogenous, fully austenitic microstructure, ready for the most demanding service conditions.
Dimensional Tolerances of Stainless Steel 904L Buttweld Fittings
We manufacture all our ASTM A403 WP904L fittings in strict adherence to the dimensional tolerances specified in ASME B16.9. This standard meticulously governs the geometry of the fittings, including crucial parameters like center-to-face dimensions, overall size, angularity, and the bevel of the welding ends. Conforming to these precise tolerances is essential for ensuring a perfect fit-up in the field, which simplifies the welding process, reduces installation costs, and guarantees the structural integrity of the completed pipeline.
Types & Forms of Stainless Steel 904L Buttweld Fittings
Amardeep Steel Center stocks a comprehensive portfolio of SS 904L fittings to meet the design requirements of any severe-service piping system.
- SS 904L 90° & 45° Elbows (LR/SR): For executing standard directional changes in highly corrosive fluid pipelines.
- SS 904L Equal & Reducing Tees: To create perpendicular branches from a main pipe run.
- SS 904L Concentric & Eccentric Reducers: To smoothly connect pipes of different diameters while maintaining optimal flow and preventing corrosion points.
- SS 904L End Caps: To provide a secure, permanent, and highly corrosion-resistant seal at the end of a pipeline.
- SS 904L Stub Ends (Lap Joints): Used with backing flanges to create a cost-effective, easily alignable flanged connection, ideal for complex systems handling aggressive media.
- SS 904L Pipe Bends: Custom-fabricated bends (e.g., 3D, 5D, 10D) for applications requiring gradual flow changes to minimize pressure drop.
- SS 904L Crosses: Four-way fittings used for creating intersecting piping networks.
Applications & Industries Served of Stainless Steel 904L Buttweld Fittings
The outstanding corrosion resistance of our 904L Stainless Steel Buttweld Fittings makes them indispensable in a range of challenging industries:
- Chemical Processing: Production, storage, and handling of sulfuric acid, phosphoric acid, and acetic acid.
- Oil and Gas: Seawater cooling systems, gas scrubbing plants, and pipelines for sour gas and other corrosive streams.
- Pharmaceuticals & Biotechnology: In reactors and piping systems where product purity must be maintained and resistance to aggressive cleaning agents is critical.
- Pulp and Paper Industry: For bleaching equipment and other systems that use chloride and acid-based chemicals.
- Desalination Plants: Essential for brine heaters, seawater intakes, and other components exposed to high-temperature, high-chloride seawater.
- Mining and Metallurgy: In acid leaching and other hydrometallurgical processes.
- Pollution Control: In flue-gas desulfurization (FGD) systems for power plants and industrial incinerators.
Why Choose Amardeep Steel for Stainless Steel 904L Buttweld Fittings?
- Manufacturing Excellence: Our state-of-the-art, integrated production facilities provide us with end-to-end control over the manufacturing process. This ensures every Stainless Steel 904L Buttweld Fitting we produce features consistent quality, precise wall thickness, and a superior finish.
- Global Exports: As a leading exporter, we have a robust logistics network serving clients across the USA, Canada, UAE, Saudi Arabia, Europe, and Southeast Asia. Our expertise in international trade ensures a seamless and on-time delivery experience.
- Fast Turnaround: We maintain a massive, ready-to-ship inventory of standard SS 904L butt weld fittings. This allows us to fulfill urgent orders quickly, minimizing downtime and keeping your critical projects on schedule.
- Certified Quality: We are an ISO 9001:2015 certified manufacturer, and quality is the foundation of our business. All fittings are supplied with a full EN 10204 3.1 Material Test Certificate (MTC), and we facilitate third-party inspections from agencies like TUV, DNV, and Lloyd’s to meet any project specification.
- Technical Support: Our team of experienced metallurgists and engineers provides around-the-clock technical support. We assist with material selection, application analysis, and technical troubleshooting, serving as a reliable partner in your success.
Related Products
Get Your Stainless Steel 904L Buttweld Fittings Price
Ready to equip your severe service application with the ultimate in corrosion resistance? Contact Amardeep Steel Center today for a prompt, no-obligation quote. Our expert sales team will provide a competitive price and a detailed delivery plan for your Stainless Steel 904L Buttweld Fittings
Frequently Asked Questions (FAQ's)
1. What makes 904L superior to 316L in corrosive environments?
The superiority of 904L comes from its significantly higher content of key alloying elements. It contains more Nickel (23-28% vs. 10-14% in 316L), more Molybdenum (4-5% vs. 2-3%), and the crucial addition of Copper. This robust chemistry provides vastly superior resistance to pitting and crevice corrosion in chloride environments and excellent resistance to reducing acids like sulfuric acid, where 316L would corrode quickly.
2. Is it difficult to weld SS 904L pipe fittings?
No, 904L has excellent weldability. Its very low carbon content prevents sensitization (carbide precipitation) in the heat-affected zone during welding, ensuring the joint remains highly corrosion-resistant. It can be welded using all common methods, though using a matching or slightly over-alloyed filler metal (like ER385) is recommended for optimal performance.
3. Are these fittings magnetic?
No. As a fully austenitic stainless steel, Grade 904L is non-magnetic in its annealed state. While severe cold working can induce slight magnetism, the fittings as supplied are non-magnetic.
4. Can I use Duplex 2205 instead of 904L?
While sometimes considered, they are not directly interchangeable. Duplex 2205 offers much higher strength and excellent resistance to chloride stress corrosion cracking. However, 904L generally provides superior resistance to uniform corrosion, especially in strong reducing acids. The choice must be based on a careful analysis of the specific corrosive media, temperature, and mechanical stress of the application.
5. Do you provide full material traceability for your ASTM B366 WP904L fittings?
Absolutely. Every Stainless Steel 904L Buttweld Fitting we supply is accompanied by an EN 10204 3.1 Material Test Certificate (MTC). This document provides complete traceability back to the original mill heat and certifies the material's chemical composition, mechanical test results, and full compliance with the ordered ASTM standards.
