Premium Stainless Steel 317/317L Buttweld Pipe Fittings by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of premium-quality Stainless Steel 317 / 317L Buttweld Pipe Fittings. These fittings are manufactured from high-molybdenum austenitic stainless steels using advanced production techniques to deliver excellent mechanical strength, precise dimensional accuracy, and long-term service reliability. Our SS 317 and 317L buttweld fittings are widely used in highly corrosive and chemically aggressive environments where enhanced resistance to pitting and crevice corrosion is critical.
Stainless Steel 317 and 317L grades are distinguished by their higher molybdenum content compared to SS 316, providing superior resistance to chlorides, acids, and harsh chemical media. The low-carbon 317L grade offers excellent weldability and improved resistance to intergranular corrosion after welding. Their buttweld pipe fittings are supplied with precision-beveled ends, allowing full-penetration welding that results in strong, leak-proof, and permanent joints suitable for severe service conditions.
These fittings provide a smooth and continuous internal surface throughout the piping system, reducing turbulence and pressure drop while enhancing resistance to corrosion, erosion, and thermal stresses. As a result, SS 317 / 317L buttweld pipe fittings are ideal for use in chemical processing plants, petrochemical units, pulp and paper industries, pharmaceutical manufacturing, marine environments, and other applications involving aggressive corrosive fluids and elevated operating temperatures.
- Stainless Steel 317 90° Elbow
- ASTM A403 SS 317L 45° Elbow
- UNS S31700 180° Elbow
- UNS S31703 LR Elbow
- DIN 1.4449 SR Elbow
- ANSI B16.9 SS 317 90° Short Radius Elbow
- DIN 1.4438 45° Long Radius Elbow
- SS ASTM A403 WP317 Equal Tee
- ASME B16.9 SS 317 Pipe Tee
- DIN 1.4449 Butt weld Tee
- ASME SA403 Stainless Steel 317L Reducing Tee
- DIN 1.4438 Unequal Tee
- UNS S31700 / S31703 Tees
- A403 WP317L SS Straight Tee
- B16.9 Stainless Steel 317 Eccentric Reducer Supplier
- ASTM A403 Stainless Steel WP317L Eccentric Reducer
- UNS S31700 / S31703 Eccentric Reducers
- DIN 1.4449 / 1.4438 Eccentric Reducer
- ANSI B16.9 Stainless Steel 317 Concentric Reducer Supplier
- ASME SA403 WP317L Stainless Steel Concentric Reducer
- UNS S31700 / S31703 Concentric Reducers
- DIN 1.4449 / 1.4438 Concentric Reducer
- ASME B16.9 SS 317 Long Stub End Supplier
- ASTM A403 WP317L SS Long Stub Ends
- UNS S31700 / S31703 Long Stub End
- SS 317 / 317L Lap Joint Stub End
- DIN 1.4449 / 1.4438 Long Stub End
- ASTM A403 SS 317 Short Stub End Supplier
- ASME B16.9 WP317L Stainless Steel Short Stub Ends
- UNS S31700 / S31703 Short Stub Ends
- DIN 1.4449 / 1.4438 Short Stub End
- ASTM A403 / SA403 WP317 Pipe Cap Supplier
- ASME B16.9 SS 317L End Pipe Cap
- UNS S31700 Pipe End Cap
- UNS S31703 Buttweld Cap
- A403 WP317L Buttweld Pipe Cap
- DIN 1.4449 / 1.4438 End Cap
- ASTM A403 Stainless Steel 317 Equal Cross
- ASME B16.9 SS 317L Buttweld Cross
- ASTM A403 WP317 / WP317L Cross
- UNS S31700 / S31703 Unequal Cross
- DIN 1.4449 / 1.4438 Reducing Cross
- ASME SA403 SS 317 Pipe Bend Exporter
- B16.9 Stainless Steel 317L Piggable Bend
- UNS S31700 / S31703 U Bend
- DIN 1.4449 / 1.4438 Long Radius Bend
- ASTM A403 WP317 / WP317L SS Buttweld Bend
CHEMICAL COMPOSITION OF STAINLESS STEEL 317/317L SEAMLESS AND WELDED PIPE FITTINGS
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| 317 | 0.08 max | 2 max | 1 max | 0.040 max | 0.03 max | 18 – 20 | 3 – 4 | 11 – 14 | – |
| 317L | 0.035 max | 2 max | 1 max | 0.040 max | 0.03 max | 18 – 20 | 3 – 4 | 11 – 15 | – |
MECHANICAL PROPERTIES OF ASME SA403 SS WP317 / 317L BUTTWELD PIPE FITTINGS
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1454 °C (2650 °F) |
| Tensile Strength | Psi – 75000, MPa – 515 |
| Yield Strength (0.2% Offset) | Psi – 30000, MPa – 205 |
| Elongation | 35 % |
SPECIFICATION OF SS 317/317L BUTTWELL FITTINGS
| Specifications | ASTM A403 / ASME SA403 |
|---|---|
| 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. |
317/317L STAINLESS STEEL ASTM A403 BUTTWELD FITTINGS EQUIVALENT GRADES
| STANDARD | UNS | WNR. | EN | JIS |
|---|---|---|---|---|
| SS 317 | S31700 | 1.4449 | – | SUS 317 |
| SS 317L | S31703 | 1.4438 | X2CrNiMo18-15-4 | SUS 317L |
PHYSICAL PROPERTIES OF ASTM A403 STAINLESS STEEL 317/317L PIPE FITTINGS
| Property | Value | Unit |
|---|---|---|
| Specific Heat (0-100°C) | 500 | J·kg⁻¹·°K⁻¹ |
| Thermal Conductivity | 14.6 | W·m⁻¹·°K⁻¹ |
| Thermal Expansion | 16.5 | mm/m/°C |
| Modulus Elasticity | 193 | GPa |
| Electrical Resistivity | 7.4 | μΩ·cm |
| Density | 7.99 | g/cm³ |
💡 Practical Difference in Use
Use Stainless Steel 317 / 317L Buttweld Pipe Fittings when: exceptionally high resistance to pitting, crevice corrosion, and chemical attack is required in severely corrosive environments, especially where chloride concentration and acidic media are more aggressive than those suitable for SS 316 grades. → Example: chemical processing plants, pulp & paper mills, petrochemical units, pollution control equipment, and highly corrosive process pipelines.
Applications of SS 317 / 317L Buttweld Pipe Fittings
Stainless Steel 317 and 317L Buttweld Pipe Fittings are engineered with higher molybdenum content to deliver superior corrosion resistance and long-term performance in aggressive chemical service conditions.
- Chemical & Process Industries: Highly corrosive acid handling lines, reactors, and chemical transport systems.
- Pulp & Paper Industry: Bleaching plants, digesters, and chemical recovery piping.
- Petrochemical & Refining: Units handling aggressive process fluids and high-chloride streams.
When to Choose SS 317 / 317L?
These grades are selected for applications that demand corrosion resistance beyond SS 316, particularly in environments with higher chloride content and stronger chemical exposure.
Choose SS 317 / 317L when:
- Service conditions are too aggressive for SS 316 / 316L
- Higher molybdenum content is required for improved pitting resistance
- Low-carbon 317L is needed to prevent intergranular corrosion after welding
- Used in high-chloride, acidic, or chemical-rich environments
- Long-term reliability in severe corrosion service is essential
Industries That Use SS 317 / 317L Buttweld Pipe Fittings
These fittings are widely used in industries where extreme corrosion resistance and durability are critical to operational safety and efficiency.
Designed for the most aggressive chemical processing environments.
Uses
Strong acid lines, reactors, and corrosive process piping.
Why SS 317 / 317L?
Higher molybdenum content delivers superior resistance to pitting, crevice corrosion, and chemical attack.
Performs reliably in highly corrosive bleaching and recovery processes.
Uses
Bleach plant piping, digesters, and chemical recovery systems.
Why SS 317 / 317L?
Excellent resistance to aggressive chemicals and chlorides ensures extended service life.
Used in demanding corrosive service within refining and petrochemical units.
Uses
Corrosive process fluid lines and high-chloride service piping.
Why SS 317 / 317L?
Superior corrosion resistance compared to SS 316 supports safe operation under severe conditions.
Usage guide for SS 317 / 317L Buttweld Pipe Fittings
Smooth directional change in highly corrosive piping systems.
Choose Elbow when
- 45°, 90°, or 180° direction change is required
- Handling aggressive acids or high-chloride fluids
- Used in chemical processing or severe corrosion service
- Maximum resistance to pitting and crevice corrosion is essential
Creates strong and reliable branch connections in aggressive service lines.
Choose Tee when
- Equal or reducing branch connections are required
- Uniform distribution of highly corrosive fluids is needed
- Used in chemical plants, pulp & paper, or petrochemical systems
- Leak-proof, full-penetration welded joints are critical
Maintains proper alignment while reducing pipe size in severe corrosive pipelines.
Choose Eccentric Reducer when
- Avoiding air or vapor pockets is important
- Pump suction lines or horizontal piping are used
- Handling high-chloride or acidic process fluids
- Flow efficiency and corrosion resistance must be maintained
Uniform diameter transition for highly corrosion-resistant piping systems.
Choose Concentric Reducer when
- Centered alignment is required
- Vertical piping systems are installed
- Smooth and balanced flow transition is necessary
- Used in chemical, petrochemical, or process pipelines
Enables easy dismantling using lap joint flanges in severe corrosive service.
Choose Long Stub End when
- Frequent inspection or dismantling is required
- High corrosion resistance is needed at flange connections
- Cost-effective solutions for large-diameter piping are preferred
- Used in chemical processing or corrosive service lines
Compact lap joint connection for space-limited corrosive applications.
Choose Short Stub End when
- Space constraints exist
- Economical lap joint flange connections are required
- Used in chemical, pharmaceutical, or process piping
- Excellent corrosion resistance with a clean finish is needed
Securely seals the end of pipes in highly corrosive environments.
Choose Pipe Cap when
- Pipe ends must be permanently or temporarily closed
- Used for pressure testing or future line expansion
- Leak-proof and corrosion-resistant sealing is essential
- Exposure to aggressive chemicals or corrosive fluids exists
Four-way branching for complex and highly corrosive piping networks.
Choose Cross when
- Flow must be divided into multiple directions
- Used in chemical, petrochemical, or process systems
- High-strength, leak-proof welded joints are required
- Long-term resistance to severe corrosion is necessary
Large-radius directional change for smooth flow in aggressive service lines.
Choose Pipe Bend when
- Gradual change in direction is required
- Used in chemical plants, pulp & paper mills, or petrochemical units
- Low turbulence and reduced pressure drop are important
- Maximum corrosion resistance and durability 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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