Premium Stainless Steel 309/310/310S Forged Pipe Fittings by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of premium-quality Stainless Steel 309 / 310 / 310S Forged Pipe Fittings. These fittings are produced from high-alloy austenitic stainless steels with elevated chromium and nickel content, using advanced forging processes to ensure excellent mechanical strength, dimensional precision, and long-term reliability. Our SS 309, 310, and 310S forged fittings are extensively used in high-temperature and corrosive service conditions.
Stainless Steel 309, 310, and 310S grades are specifically engineered for elevated-temperature applications and provide exceptional resistance to oxidation, scaling, and thermal fatigue. Forged construction enhances structural integrity and allows these fittings to withstand extreme temperatures and pressures without deformation. The low-carbon 310S grade offers improved weldability while maintaining excellent high-temperature performance.
These forged pipe fittings maintain a consistent internal surface, promoting smooth fluid flow, reducing pressure drop, and enhancing resistance to corrosion and erosion under severe operating conditions. SS 309 / 310 / 310S forged fittings are widely used in furnaces, heat-treatment equipment, petrochemical processing, power plants, and other high-temperature industrial applications.
- SS 309 / 310 / 310S Socket Weld & Threaded Elbow
- UNS S30900 / S31000 / S31008 Forged Elbow
- ASME SA 182 F310S 45° & 90° Elbow
- DIN 1.4845 Stainless Steel Forged Elbow
- ASTM A182 SS 309 Forged Equal Tee
- ASME SA182 SS 310 / 310S Socket Weld Tee
- DIN 1.4841 / 1.4307 Reducing Tee
- UNS S31008 Unequal & Threaded Tee
- ASTM A182 F309 Threaded Equal Cross
- ASME SA182 SS 310 Socket Weld Cross
- DIN 1.4828 / UNS S30900 Forged Cross
- SS 310S Reducing & Unequal Cross
- UNS S30900 Forged Full Coupling
- ASME SA 182 SS 310 Socket Weld Coupling
- ASTM A182 SS 310S Threaded Full Coupling
- DIN 1.4828 Stainless Steel Coupling
- ASTM A182 F310S Socket Weld Half Coupling
- UNS S30900 / S31000 / S31008 Half Coupling
- ANSI B16.11 SS 309 Threaded Half Coupling
- UNS S30900 Forged Pipe End Cap
- ASTM A182 F310 Socket Weld Pipe Cap
- ASME SA 182 SS 310S Forged End Cap
- Stainless Steel 309 Threaded Pipe Cap
- UNS S30900 Socket Weld Forged Union
- ASTM A182 F310 Threaded Union
- ASME SA 182 SS 310S Forged Union
- ANSI Stainless Steel 309 Union
- UNS S30900 Forged Threaded Bushing
- ANSI B16.36 SS 309 Hex Head Bushing
- ASTM A182 F310 Stainless Steel Bushing
- ASME SA 182 SS 310S Forged Bushing
- UNS S30900 Threaded & Socket Weld Nipple
- ASTM A182 F310 Swage & Pipe Nipple
- ASME SA 182 SS 310S Hex Nipple
- SS 309 / 310 / 310S Screwed Pipe Nipple
CHEMICAL COMPOSITION OF SS 309/310/310S FORGED PIPE FITTINGS
| Element | SS 309 | SS 310 | SS 310S |
|---|---|---|---|
| Ni | 14 max | 19 – 22 | 19 – 22 |
| Cr | 23 max | 24 – 26 | 24 – 26 |
| C | 0.20 max | 0.25 max | 0.08 max |
| Fe | 60 max | Balance | – |
| Mn | 2 max | 2 max | 2 max |
| Si | 1 max | 1.50 max | 1.50 max |
| S | 0.030 max | 0.03 max | 0.03 max |
| P | 0.045 max | 0.045 max | 0.045 max |
MECHANICAL PROPERTIES OF ASME SA403 SS WP309 / 310/ 310S FORGED PIPE FITTINGS
| Element | SS 309 | SS 310 | SS 310S |
|---|---|---|---|
| Tensile Strength | Psi – 89900, MPa – 620 | Psi – 75000, MPa – 515 | Psi – 75000, MPa – 515 |
| Yield Strength (0.2%Offset) | Psi – 45000, MPa – 310 | Psi – 30000, MPa – 205 | Psi – 30000, MPa – 205 |
| Elongation | 45 % | 35 % | 35 % |
SPECIFICATION OF STAINLESS STEEL 309/310/310S 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. |
309/310/310S STAINLESS STEEL ASTM A403 FORGED FITTINGS EQUIVALENT GRADES
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|---|
| SS 309 | S30900 | 1.4833 | – | – | – | – | – |
| SS 310 | S31000 | 1.4841 | – | X2CrNi18-9/X2CrNi19-11 | SUS 310 | 310524 | 20Ch25N20S2 |
| SS 310S | S31008 | 1.4845 | – | X8CrNi25-21 | SUS 310S | 310516 | 20Ch23N18 |
PHYSICAL PROPERTIES OF ASTM A403 STAINLESS STEEL 309/310/310S PIPE FITTINGS
| Property | SS 309 | SS 310 | SS 310S |
|---|---|---|---|
| Density | 8.0 g/cm³ | 8.0 g/cm³ | 8.0 g/cm³ |
| Melting Point | 1455 °C (2650 °F) | 1454 °C (2650 °F) | 1454 °C (2650 °F) |
💡 Practical Difference in Use
Use Stainless Steel 309 / 310 / 310S Forged Pipe Fittings when: continuous or intermittent high-temperature service, excellent oxidation resistance, and structural stability under thermal cycling are required. → Example: furnace piping, thermal processing systems, heat treatment plants, and high-temperature petrochemical units.
Applications of SS 309 / 310 / 310S Forged Pipe Fittings
Stainless Steel 309, 310, and 310S Forged Pipe Fittings are designed for extreme heat resistance and pressure integrity in demanding thermal environments.
- Furnace & Heat Treatment: Burner lines, radiant tube connections, and hot gas piping.
- Petrochemical & Refining: High-temperature process and transfer lines.
- Power Generation: Superheater, boiler, and exhaust system piping.
When to Choose SS 309 / 310 / 310S?
These grades are chosen for applications requiring exceptional oxidation resistance, high-temperature strength, and long-term reliability under severe thermal conditions.
Choose SS 309 / 310 / 310S when:
- Operating temperatures exceed SS 304 limits
- Outstanding oxidation and scaling resistance is required
- Forged fittings must withstand thermal cycling
- High chromium and nickel content is necessary
- Used in furnaces, heaters, and thermal reactors
Industries That Use SS 309 / 310 / 310S Forged Pipe Fittings
These forged fittings are used in industries where extreme heat resistance and mechanical integrity are critical.
Designed for prolonged exposure to high temperatures.
Uses
Burner assemblies, radiant tubes, and hot gas lines.
Why SS 309 / 310 / 310S?
Superior oxidation resistance and high-temperature strength.
Used in severe thermal and corrosive environments.
Uses
Cracking units, reformers, and hot process pipelines.
Why SS 309 / 310 / 310S?
High chromium-nickel composition ensures thermal stability.
Essential for high-heat and exhaust applications.
Uses
Boiler internals, superheater lines, and flue gas piping.
Why SS 309 / 310 / 310S?
Excellent heat resistance and long service life.
Usage Guide for SS 309 / 310 / 310S Forged Pipe Fittings
Directional flow change with strong welded joints for high temperatures.
Choose Socket Weld Elbow when
- 45° or 90° direction change is required
- High-temperature and high-pressure service is involved
- Leak-proof welded joints are critical
- Compact, durable connections are needed
Creates equal or reduced branch connections in high-temperature piping.
Choose Tee when
- Flow must be split into branch lines
- Equal or reduced outlet sizes are required
- Threaded or socket connections are used
- Compact layouts are preferred in thermal systems
Four-way threaded flow distribution in high-temperature systems.
Choose Cross when
- Flow must be divided in four directions
- Used in thermal, chemical, or power plants
- Compact piping layouts are required
- High-strength threaded joints are essential
Joins two pipes of equal size in high-temperature services.
Choose Full Coupling when
- Pipe extension or repair is required
- Inline threaded connections are needed
- High mechanical strength is important
- Leak-tight joints under thermal stress are essential
Single-ended connection welded to equipment or vessels.
Choose Half Coupling when
- Branch connections are required on high-temp equipment
- Instrumentation or vent connections are needed
- High-pressure and thermal conditions exist
- Strong, compact connections are required
Securely seals the end of high-temperature threaded pipelines.
Choose Cap when
- Pipe ends need to be closed
- Used for isolation or pressure testing
- Leak-proof termination is essential
- High-temperature corrosion resistance is required
Allows easy disconnection in high-temperature piping sections.
Choose Union when
- Frequent dismantling is required
- Maintenance access is important
- Leak-tight threaded joints are needed
- Used in medium-pressure, high-temp lines
Threaded size reduction in high-temperature pipelines.
Choose Bushing when
- Pipe size reduction is required
- Space-efficient transitions are needed
- Threaded piping systems are used
- Heat and oxidation resistance is critical
Short threaded connection in high-temperature piping systems.
Choose Nipple when
- Joining two female-threaded components
- Compact, high-temperature connections are needed
- Used in furnace, thermal, or utility lines
- Oxidation and heat resistance is critical
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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