Premium Stainless Steel 904L Buttweld Pipe Fittings by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of Stainless Steel 904L Buttweld Pipe Fittings. Made from high-alloy, low-carbon 904L stainless steel, these fittings deliver superior corrosion resistance, excellent mechanical strength, and long-lasting performance in aggressive chemical and high-temperature environments.
SS 904L is specially engineered for resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for critical applications in chemical processing, petrochemical plants, seawater systems, and power generation. Our buttweld fittings come with precision-beveled ends for full-penetration welding, ensuring leak-proof, strong, and durable joints.
Designed for smooth internal flow, minimal turbulence, and enhanced operational efficiency, our 904L buttweld pipe fittings are perfect for pipelines, heat exchangers, reactors, and industrial systems that demand the highest reliability and resistance to harsh chemicals. Trust Ratnadeep Steel & Engg. Co. for premium-quality SS 904L buttweld fittings that meet global standards and industrial requirements.
- Stainless Steel 904L 90 Deg Elbow
- ASTM A366 SS 904L 45 Deg Elbow
- UNS N08904 180 Deg Elbow
- A366 WP904L LR Elbow
- DIN 1.4539 SR Elbow
- ANSI B16.9 SS 904L 90 Degree Short Radius Elbow
- DIN 1.4539 45 Deg Long Radius Elbow
- SS ASTM A366 WP904L Equal Tee
- ASME B16.9 SS 904L Pipe Tee
- DIN 1.4539 Butt weld Tee
- ASME SA366 Stainless Steel 904L Reducing Tee manufacturer
- SS UNS N08904 Unequal Tee
- A366 WP904L SS Straight Tee
- B16.9 Stainless Steel 904L Eccentric Reducer Supplier
- ASTM A366 Stainless Steel WP904L Eccentric Reducer
- SS UNS N08904 Eccentric Reducers
- DIN 1.4539 Eccentric Reducer
- ANSI B16.9 Stainless Steel 904L Concentric Reducer Supplier
- SS ASME SA 366 WP904L Concentric Reducer
- UNS N08904 Concentric Reducers
- SS DIN 1.4539 Concentric Reducer
- ASME B16.9 SS 904L Long Stub End Supplier
- ASTM A366 WP904L SS Long Stub Ends
- UNS N08904 Long Stub End
- SS 904L Lap Joint Stub End
- DIN 1.4539 Long Stub End
- ASTM A366 SS 904L Short Stub End Supplier
- ASME B16.9 Stainless Steel A366 WP904L Short Stub Ends
- SS UNS N08904 Short Stub Ends
- SS DIN 1.4539 Short Stub End
- ASTM A366 Stainless Steel WP904L Pipe Cap Supplier
- ASME B16.9 SS 904L End Pipe Cap
- UNS N08904 Pipe End Cap
- 904L SS Buttweld Cap
- SA366 WP904L Buttweld Pipe Cap
- DIN 1.4539 End Cap
- ASTM A366 Stainless Steel 904L Equal Cross
- ASME B16.9 SS 904L Buttweld Cross
- ASTM A366 WP904L Cross
- SS UNS N08904 Unequal Cross
- DIN 1.4539 Reducing Cross
- ASME SA 366 SS 904L Pipe Bend Exporter
- B16.9 Stainless Steel 904L Piggable Bend
- UNS N08904 U Bend
- SS DIN 1.4539 Long Radius Bend
- ASTM A366 WP904L SS Buttweld Bend
CHEMICAL COMPOSITION OF STAINLESS STEEL 904L SEAMLESS AND WELDED PIPE FITTINGS
| Element | C | Cr | Cu | Mn | Mo | Ni | P | S | Si |
|---|---|---|---|---|---|---|---|---|---|
| 904L | 0.02 max | 19.0-23.0 | 1.0-2.0 | 2.0 max | 4.0-5.0 | 23.0-28.0 | 0.045 max | 0.035 max | 1.0 max |
MECHANICAL PROPERTIES OF ASME SA366 SS WP904L BUTTWELD PIPE FITTINGS
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness – Rockwell B (HR B) | Hardness – Brinell (HB) |
|---|---|---|---|---|---|
| 904L | 490 | 220 | 36 | 70-90 typical | 150 |
SPECIFICATION OF SS 904L BUTTWELD FITTINGS
| Specifications | ASTM A366 / ASME SA366 |
|---|---|
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, BS4504, BS4504, BS1560, BS10 ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799 |
| Size | Seamless Butt Weld Fittings: ½” to 10″ | Welded Butt Weld Fittings: ½” to 48″ |
| Schedule | SCH10, SCH20, SCH30, STD SCH40, SCH60, XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS available with NACE MR 01-75 |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Type | Seamless / ERW / Welded / Fabricated |
| Thickness | 20 Swg., 18 Swg., 16 Swg., 14 Swg., 12 Swg., 10 Swg., & Sch. 10, Sch. 40, Sch. 80 etc. |
904L STAINLESS STEEL ASTM A366 BUTTWELD FITTINGS EQUIVALENT GRADES
| STANDARD | WNR. | UNS | JIS | BS |
|---|---|---|---|---|
| SS 904L | 1.4539 | N08904 | SUS 904L | 904S13 |
PHYSICAL PROPERTIES OF ASTM A366 STAINLESS STEEL 904L PIPE FITTINGS
| Grade | Density (kg/m³) | Elastic Modulus (GPa) | Mean Co-eff of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m·K) | Specific Heat 0-100°C (J/kg·K) | Elec Resistivity (nΩ·m) |
|---|---|---|---|---|---|---|
| 904L | 7900 | 190 | 0-100°C: 15 | At 20°C: 11.5 At 500°C: – |
500 | 952 |
💡 Practical Difference in Use
Use Stainless Steel 904L Buttweld Pipe Fittings when: superior resistance to corrosion, especially in acidic and chloride-containing environments, is required. These high-alloy, low-carbon austenitic stainless steels are ideal for welded components exposed to strong reducing acids, seawater, and harsh chemical processes. → Example: chemical process piping, acid handling systems, heat exchangers, desalination plants, and high-reliability industrial pipelines.
Applications of SS 904L Buttweld Pipe Fittings
Stainless Steel 904L Buttweld Pipe Fittings are engineered for extreme corrosion resistance, excellent mechanical strength, and reliable performance in aggressive chemical and high-temperature environments.
- Chemical & Petrochemical: Corrosive process piping, reactors, acid lines, and solvent transfer systems.
- Seawater & Desalination: Piping for seawater cooling, desalination units, and marine environments.
- Power & Industrial Systems: Heat exchangers, high-pressure process lines, and chemical storage connections.
When to Choose SS 904L?
This grade is selected for applications requiring outstanding resistance to strong oxidizing and reducing acids, chlorides, and other aggressive chemicals, along with excellent weldability and dimensional stability.
Choose SS 904L when:
- Piping will handle strong acids, chlorides, or seawater environments
- High corrosion resistance is required over long-term service
- Welded joints must maintain integrity in chemically aggressive conditions
- High-alloy stainless steel is needed to prevent pitting and crevice corrosion
- Used in chemical processing, desalination, marine, or power plant systems
Industries That Use SS 904L Buttweld Pipe Fittings
These fittings are widely used in industries where maximum corrosion resistance, chemical stability, and dependable welded performance are essential.
Designed for continuous service in highly corrosive chemical environments.
Uses
Acid handling lines, reactors, process piping, and solvent transfer systems.
Why SS 904L?
High alloy content and low carbon prevent pitting, crevice corrosion, and stress corrosion cracking in aggressive chemical applications.
Trusted for resistance against chlorides and marine corrosion.
Uses
Seawater intake lines, cooling systems, and desalination plant piping.
Why SS 904L?
Exceptional resistance to chloride-induced corrosion ensures long-term reliability in marine and desalination environments.
Used where chemical and thermal stability is critical.
Uses
Heat exchangers, high-pressure chemical lines, and industrial process pipelines.
Why SS 904L?
High corrosion resistance and weldability make it ideal for long-term service under harsh chemical and temperature conditions.
Usage guide for SS 904L Buttweld Pipe Fittings
Smooth directional change in highly corrosive and welded piping systems.
Choose Elbow when
- 45°, 90°, or 180° direction change is required
- Piping handles strong acids, chlorides, or seawater
- Welded joints must resist pitting and crevice corrosion
- Used in chemical plants, desalination systems, or marine pipelines
Creates strong branch connections for corrosion-resistant service lines.
Choose Tee when
- Equal or reducing branch connections are required
- Piping is exposed to aggressive chemicals or seawater
- Long-term weld and corrosion stability is critical
- Used in chemical processing, desalination, or marine systems
Maintains alignment while reducing pipe size in corrosive pipelines.
Choose Eccentric Reducer when
- Avoiding air or vapor pockets is important
- Pump suction lines or horizontal chemical piping are used
- Thermal expansion and stress must be managed
- High corrosion resistance and weld integrity are required
Uniform diameter transition for chemically aggressive piping systems.
Choose Concentric Reducer when
- Centered alignment is required
- Vertical or high-pressure chemical lines are installed
- Smooth flow transition is necessary
- Used in reactors, heat exchangers, or desalination piping
Allows easy dismantling using lap joint flanges in corrosive service lines.
Choose Long Stub End when
- Frequent inspection or maintenance is required
- High corrosion and chemical resistance at flange joints is needed
- Cost-effective solutions for large-diameter piping are preferred
- Used in chemical plants, desalination, or marine piping systems
Compact lap joint connection for space-restricted corrosive applications.
Choose Short Stub End when
- Space constraints exist
- Economical lap joint flange connections are required
- Used in chemical process lines or heat exchangers
- Resistance to pitting, crevice, and stress corrosion is essential
Securely seals pipe ends in chemically aggressive service environments.
Choose Pipe Cap when
- Pipe ends must be permanently or temporarily closed
- Used for pressure testing or future line expansion
- Leak-proof sealing under corrosive, high-temperature, or high-pressure conditions is essential
- Exposed to acids, chlorides, or thermal cycling environments
Four-way branching for complex chemical or seawater piping networks.
Choose Cross when
- Flow must be divided into multiple directions
- Used in chemical plants, desalination, or marine systems
- Strong, corrosion-resistant welded joints are required
- Resistance to pitting and stress corrosion is critical
Large-radius directional change for smooth flow in corrosive service lines.
Choose Pipe Bend when
- Gradual change in direction is required
- Used in chemical reactors, desalination, or seawater pipelines
- Low turbulence and reduced pressure drop are important
- Long-term corrosion resistance and weld integrity are required
Our Buttweld Pipe Fittings are manufactured using advanced processes and undergo extensive quality checks to ensure flawless weldability, durability, and long service life. Each fitting is thoroughly inspected using key NDT techniques such as radiographic testing (RT), ultrasonic testing (UT), hydrostatic testing, and visual/dimensional examination. We also perform detailed chemical composition analysis and mechanical property testing to ensure material compliance with strict industry standards.
Throughout the forming and welding stages, every buttweld fitting is monitored closely to eliminate defects such as misalignment, surface irregularities, and wall-thickness variations. This ensures perfect joint integrity and high-performance reliability in pipelines carrying high temperatures, pressures, and corrosive media. All our buttweld fittings fully comply with ASME, ASTM, MSS-SP, and related global specifications, making them a preferred choice for critical piping systems worldwide.
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