Premium Stainless Steel 904L Forged Pipe Fittings by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of Stainless Steel 904L Forged Pipe Fittings. These fittings are produced from high-alloy, low-carbon 904L stainless steel using precision forging processes to deliver exceptional corrosion resistance, excellent mechanical strength, and long-term operational reliability in aggressive environments.
SS 904L is specially developed for superior resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in acidic and chloride-rich conditions. Its high nickel, chromium, and molybdenum content ensures outstanding performance in harsh chemical service. Our forged pipe fittings are supplied in socket weld and threaded types, ensuring compact, pressure-tight, and leak-proof connections.
Stainless Steel 904L forged pipe fittings are ideal for high-pressure and highly corrosive applications where reliability is critical. They are widely used in chemical processing plants, petrochemical industries, seawater systems, heat exchangers, reactors, and power generation facilities requiring superior corrosion resistance and mechanical stability.
- SS 904L Socket Weld Elbow
- UNS N08904 Threaded Forged Elbow
- SUS 904L Stainless Steel Forged Elbow
- ASME SA182 SS F904L 45° & 90° Elbow
- ASME SA182 SS 904L Socket Weld Tee
- ASTM A182 SS 904L Forged Equal Tee
- DIN 1.4539 Reducing Tee
- SS 904L Unequal & Threaded Tee
- ASTM A182 F904L Threaded Equal Cross
- UNS N08904 / DIN 1.4539 Forged Cross
- ASME SA182 SS 904L Socket Weld Cross
- SS 904L Threaded, Reducing & Unequal Cross
- DIN 1.4539 Threaded Full Coupling
- UNS N08904 Forged Full Coupling
- ASME SA182 SS 904L Socket Weld Full Coupling
- ASTM A182 SS 904L Full Coupling
- ASTM A182 F904L SS Socket Weld Half Coupling
- UNS N08904 Half Coupling
- ANSI B16.11 SS 904L Threaded Half Coupling
- UNS N08904 Forged Pipe End Cap
- ASTM A182 F904L SS Socket Weld Pipe Cap
- ASME SA182 SS 904L Forged Pipe End Cap
- SS 904L Threaded Pipe Cap
- UNS N08904 Socket Weld Union
- ANSI B16.5 SS 904L Union
- ASTM A182 F904L Threaded Union
- ASME SA182 SS 904L Forged Union
- UNS N08904 Threaded Bushing
- ANSI B16.36 SS 904L Hex Head Bushing
- ASTM A182 F904L SS Threaded Bushing
- ASME SA182 SS 904L Forged Threaded Bushing
- UNS N08904 Threaded & Socket Weld Nipple
- B16.36 SS 904L Socket Weld Nipple
- ASTM A182 F904L SS Swage Nipple
- ASME SA182 SS 904L Hex Nipple
- SS 904L Screwed Pipe Nipple
CHEMICAL COMPOSITION OF STAINLESS STEEL 904L FORGED 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 FORGED 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 STAINLESS STEEL 904L FORGED FITTINGS
| Specifications | ASTM A182 / ASME SA182 |
|---|---|
| Dimension Standard | ASME B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, MSS-SP-97, BS3799 |
| Size | 1/8″ NB to 4″ NB |
| Type | Socketweld Fittings, Screwed-Threaded Fittings (NPT or PT Type) |
| Rating Pressure | Threaded End – 2000 / 3000/ 6000 LBS. Socket-weld End – 3000 / 6000/ 9000 LBS. |
904L STAINLESS STEEL ASTM A366 FORGED 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 Forged Pipe Fittings when: exceptional resistance to strong acids, chlorides, and aggressive chemical environments is required in compact, high-pressure piping systems. → Example: chemical processing plants, acid handling systems, desalination units, and high-reliability industrial pipelines.
Applications of SS 904L Forged Pipe Fittings
Stainless Steel 904L Forged Pipe Fittings are high-alloy, low-carbon grades engineered for extreme corrosion resistance and long-term chemical stability.
- Chemical & Petrochemical: Acid lines, reactors, and corrosive fluid transfer systems.
- Seawater & Desalination: Chloride-rich and marine environments.
- Power & Industrial Systems: Heat exchangers and high-pressure chemical piping.
When to Choose SS 904L?
This grade is selected for forged piping systems requiring outstanding resistance to aggressive acids, chlorides, and stress corrosion cracking.
Choose SS 904L when:
- Piping handles strong acids, chlorides, or seawater
- Maximum corrosion resistance is required
- Welded forged fittings must retain long-term integrity
- High-alloy stainless steel is necessary for severe service
- Used in chemical, marine, or power generation systems
Usage Guide for SS 904L Forged Pipe Fittings
Directional flow change with strong welded joints in highly corrosive applications.
Choose Socket Weld Elbow when
- 45° or 90° direction change is required
- High-pressure or corrosive service is involved
- Leak-proof socket weld joints are critical
- Compact and durable connections are needed
Creates branch connections in highly corrosion-resistant piping systems.
Choose Tee when
- Flow must be split into branch lines
- Equal or reduced outlet sizes are required
- Threaded or socket-weld connections are used
- Used in chemical, marine, or hygienic systems
Four-way flow distribution in highly corrosive service piping.
Choose Cross when
- Flow must be split in multiple directions
- Compact threaded piping layouts are used
- Used in chemical or marine applications
- Strong, corrosion-resistant threaded joints are required
Joins two pipes of the same size in highly corrosive environments.
Choose Full Coupling when
- Pipe extension or repair is required
- Inline threaded connections are used
- High mechanical strength is needed
- Leak-tight, corrosion-resistant joints are essential
Single-end connection welded to equipment or piping.
Choose Half Coupling when
- Branch or instrument connections are required
- Used in chemical, pharma, or marine systems
- Strong and compact welded joints are needed
- Exceptional corrosion resistance is critical
Seals the end of highly corrosion-resistant threaded pipelines.
Choose Cap when
- Pipe ends must be closed or isolated
- Used for pressure testing or future expansion
- Leak-proof termination is required
- Exposure to highly corrosive fluids or environments exists
Allows easy disconnection in highly corrosion-resistant piping systems.
Choose Union when
- Frequent maintenance or dismantling is required
- Leak-tight threaded joints are important
- Used in chemical, pharma, or marine services
- Exceptional corrosion resistance at joints is critical
Threaded size reduction in highly corrosion-resistant piping systems.
Choose Bushing when
- Pipe size reduction is required
- Space-saving threaded transitions are needed
- Used in chemical or marine pipelines
- Resistance to pitting, crevice, and acid corrosion is essential
Short threaded connection for extremely corrosion-resistant piping systems.
Choose Nipple when
- Joining two female-threaded components
- Compact pipe extensions are required
- Used in chemical, marine, or highly corrosive process lines
- Exceptional resistance to pitting, crevice corrosion, and acids is essential
Our Forged Pipe Fittings are manufactured using advanced forging processes and undergo extensive quality checks to ensure flawless dimensional accuracy, 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 forging and finishing stages, every forged 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 forged 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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