Premium Stainless Steel 347/347H Forged Pipe Fittings by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of premium-quality Stainless Steel 347 / 347H Forged Pipe Fittings. These fittings are manufactured from niobium (columbium)-stabilized austenitic stainless steels using advanced forging technology to achieve excellent mechanical strength, superior dimensional precision, and long service life. Our SS 347 and 347H forged fittings are widely used in high-temperature and corrosive service environments.
Stainless Steel 347 and 347H grades are engineered to resist intergranular corrosion caused by carbide precipitation during welding and prolonged high-temperature exposure. Niobium stabilization ensures metallurgical stability, while the higher carbon content in 347H enhances creep strength at elevated temperatures. These forged pipe fittings are available in socket weld and threaded designs, offering strong, leak-free, and vibration-resistant connections.
SS 347 / 347H forged pipe fittings provide excellent resistance to oxidation, thermal fatigue, and high-temperature corrosion, making them suitable for critical applications. They are commonly used in heat exchangers, superheaters, refinery and petrochemical piping, power generation systems, exhaust manifolds, and high-temperature chemical processing lines.
- SS 347/347H Socket Weld Elbow
- UNS S34700 / S34709 Threaded Forged Elbow
- DIN 1.4961 Stainless Steel Forged Elbow
- ASME SA182 SS F347H 45° & 90° Elbow
- ASME SA182 SS 347H Socket Weld Tee
- ASTM A182 SS 347 Forged Equal Tee
- DIN 1.4550 Reducing Tee
- UNS S34709 Unequal & Threaded Tee
- ASTM A182 F347 Threaded Equal Cross
- UNS S34700 / DIN 1.4550 Forged Cross
- ASME SA182 SS 347H Socket Weld Cross
- SS 347 Threaded, Reducing & Unequal Cross
- DIN 1.4550 Threaded Full Coupling
- UNS S34700 Forged Full Coupling
- ASME SA182 SS 347H Socket Weld Full Coupling
- ASTM A182 SS 347 Full Coupling
- ASTM A182 F347 SS Socket Weld Half Coupling
- UNS S34700 / S34709 Half Coupling
- ANSI B16.11 SS 347 Threaded Half Coupling
- UNS S34700 Forged Pipe End Cap
- ASTM A182 F347 SS Socket Weld Pipe Cap
- ASME SA182 SS 347H Forged Pipe End Cap
- SS 347 Threaded Pipe Cap
- UNS S34700 Socket Weld Union
- ANSI B16.5 SS 347 Union
- ASTM A182 F347 Threaded Union
- ASME SA182 SS 347/347H Forged Union
- UNS S34700 Threaded Bushing
- ANSI B16.36 SS 347 Hex Head Bushing
- ASTM A182 F347 Stainless Steel Threaded Bushing
- ASME SA182 SS 347/347H Forged Bushing
- UNS S34700 Threaded & Socket Weld Nipple
- ASTM A182 F347 Swage & Pipe Nipple
- ASME SA182 SS 347 Hex Nipple
- SS 347/347H Screwed Pipe Nipple
CHEMICAL COMPOSITION OF STAINLESS STEEL 347/347H FORGED PIPE FITTINGS
| Element | C | Cr | Mn | Ni | P | S | Si | Cb/Ta |
|---|---|---|---|---|---|---|---|---|
| SS 347 | 0.08 max | min: 17.0 max: 20.0 |
2.0 max | min: 9.0 max: 13.0 |
0.04 max | 0.30 max | 0.75 max | min:10x C max: 1.0 |
| SS 347H | min: 0.04 max: 0.10 |
min: 17.0 max: 20.0 |
2.0 max | min: 9.0 max: 13.0 |
0.03 max | 0.30 max | 0.75 max | min:10x C max: 1.0 |
MECHANICAL PROPERTIES OF ASME SA403 SS WP347 / 347H FORGED PIPE FITTINGS
| Grade | Tensile Strength ksi (MPa) min | Yield Strength 0.2% ksi offset ksi (MPa) min | Elongation (% in 50mm) min | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
|---|---|---|---|---|---|
| 347/347H | 75 (515) | 30 (205) | 40 | 201 | 95 |
SPECIFICATION OF STAINLESS STEEL 347/347H 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. |
347/347H STAINLESS STEEL ASTM A403 FORGED FITTINGS EQUIVALENT GRADES
| STANDARD | UNS | WNR. | EN | JIS | GOST |
|---|---|---|---|---|---|
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | – |
PHYSICAL PROPERTIES OF ASTM A403 STAINLESS STEEL 347/347H PIPE FITTINGS
| Density lbm/in³ | Coefficient of Thermal Expansion (min/in) °F | Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm-°F | Modules of Elasticity (annealed)²-psi |
|---|---|---|---|---|
| at 68 °F: 0.288 | at 68 – 212°F: 9.2 at 68 – 1832°F: 11.4 |
68-932°F: 14.7 | at 32 – 212°F: 0.12 | in tension (E): 28 × 10⁶ |
💡 Practical Difference in Use
Use Stainless Steel 347 / 347H Forged Pipe Fittings when: superior resistance to intergranular corrosion, oxidation, and mechanical strength at elevated temperatures is required for welded components operating under continuous thermal stress. → Example: heat exchangers, superheaters, refinery piping, exhaust manifolds, and high-temperature petrochemical systems.
Applications of SS 347 / 347H Forged Pipe Fittings
Stainless Steel 347 and 347H Forged Pipe Fittings are niobium-stabilized grades engineered for severe high-temperature service and resistance to carbide precipitation.
- Heat Exchangers & Superheaters: High-temperature forged connections.
- Petrochemical & Refining: Hot process and reformer piping.
- Power Generation: Boiler and superheater piping systems.
When to Choose SS 347 / 347H?
These grades are selected for forged fittings requiring long-term stability, oxidation resistance, and strength at elevated temperatures.
Choose SS 347 / 347H when:
- Operating temperatures exceed SS 304 / 304L limits
- Welded joints face prolonged or cyclic high-temperature exposure
- Niobium stabilization is required to prevent intergranular corrosion
- 347H is needed for enhanced creep and stress rupture strength
- Used in high-temperature forged piping systems
Usage Guide for SS 347 / 347H Forged Pipe Fittings
Directional flow change with strong welded joints in high-temperature 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 high-temperature 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 high-temperature 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 high-temperature corrosive environments.
Choose Full Coupling when
- Pipe extension or repair is required
- Inline threaded connections are used
- High mechanical strength is needed
- Corrosion-resistant, leak-tight 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
- Excellent corrosion and intergranular corrosion resistance is critical
Seals the end of high-temperature 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 corrosive fluids or high-temperature environments exists
Allows easy disconnection in high-temperature 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
- Resistance to intergranular corrosion at joints is critical
Threaded size reduction in high-temperature corrosive piping systems.
Choose Bushing when
- Pipe size reduction is required
- Space-saving threaded transitions are needed
- Used in chemical or marine pipelines
- Resistance to corrosion and crevice attack is essential
Short threaded connection for high-temperature, corrosion-resistant piping systems.
Choose Nipple when
- Joining two female-threaded components
- Compact pipe extensions are required
- Used in chemical, marine, or high-temperature process lines
- Excellent resistance to intergranular corrosion 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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