1-1/2" SCH10 ANSI B16.9 Duplex 2507 90 Degree LR Elbow Industrial Pipe Fitting

Product Specification

1-1/2" SCH10 ANSI B16.9 Duplex 2507 90 Degree LR Elbow Industrial Pipe Fitting

1. Product Description

This product is a 90-degree Long Radius (LR) butt-welding elbow manufactured from Super Duplex Stainless Steel 2507 (UNS S32750) in accordance with ANSI/ASME B16.9 and ASTM A815 standards. Super Duplex 2507 is a high-alloy duplex stainless steel with a dual-phase microstructure of approximately 50% ferrite and 50% austenite, characterized by a PREN value exceeding 40. The LR design features a radius of curvature equal to 1.5 times the pipe diameter (R = 1.5D), ensuring smooth fluid flow with minimal pressure loss. This 1-1/2" SCH10 fitting is designed for permanent butt-weld connection in demanding industrial piping systems requiring exceptional strength and corrosion resistance.

2. Key Product Parameters

3. Application / Usage

This 90° LR elbow is ideal for extremely aggressive and high-stress environments:

• Oil & Gas: Offshore platforms, subsea piping systems, wellhead connections, seawater injection lines

• Chemical Processing: Chloride-containing acids, heat exchangers, high-pressure process lines

• Marine & Desalination: Seawater piping, reverse osmosis systems, brine handling

• Power Generation: Cooling water systems, condenser piping

• Pulp and Paper: Bleaching lines, digesters

• Sour Gas Service: NACE MR0175 compliant applications

4. Advantages

• Superior Strength: Yield strength (550 MPa) is approximately 2.5 to 3 times that of 316L, enabling thinner walls and lighter piping systems

• Exceptional Corrosion Resistance: PREN 41-43 provides outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking (SCC)

• Superior to 2205: Outperforms standard duplex 2205 in both corrosion resistance and mechanical strength

• Long Radius Design: R=1.5D minimizes pressure drop, turbulence, and erosion

• Excellent Weldability: Compatible with standard welding procedures; solution annealing required post-weld

• Wide Temperature Range: Maintains properties from -50°C to 300°C

5. Functions

The 90° LR elbow changes the direction of fluid flow within a piping system by 90 degrees with minimal pressure loss. The long radius design (R=1.5D) reduces flow resistance, turbulence, and erosion, making it suitable for high-velocity and corrosive media applications. The butt-weld connection provides a permanent, leak-proof joint with high structural integrity for critical service environments.

6. Installation Instructions

1. Unpacking Inspection: Check for transit damage; verify markings, dimensions, and material certification per ASME B16.9

2. Surface Preparation: Clean the weld bevel and adjacent area using dedicated stainless steel tools; remove all oil, grease, and contaminants

3. Alignment: Accurately align the elbow with connecting pipes, ensuring proper fit-up. Maximum allowable misalignment: 10% of wall thickness, not exceeding 1.5mm

4. Tack Welding: Apply minimum tack welds to hold the assembly in position; clean thoroughly before final welding

5. Welding: Perform butt-weld following approved WPS with certified welders. For Super Duplex 2507, strict heat input control is essential. Use GTAW or SMAW with matching filler metal (e.g., ER2594). Shielding gas: 100% argon or Ar-He mix. Interpass temperature must be maintained ≤150°C to prevent intermetallic phase formation

6. Post-Weld Treatment: Solution annealing at 1025-1125°C followed by water quenching is required to restore the duplex structure and corrosion resistance

7. Inspection: Perform NDT (PT/MT, UT, RT) as per project requirements. Ferrite content verification per ASTM E562 is recommended

7. Precautions

• Temperature Limitation: Not recommended for use above 300°C; prolonged exposure above 250°C may cause embrittlement

• Ferrite Balance: Ensure ferrite content remains between 40-60% . Improper heat treatment is the most common cause of out-of-spec ferrite ratios

• Intermetallic Phase Sensitivity: Super duplex welds are sensitive to sigma and chi phase formation; tight heat input control is mandatory

• Cleanliness: Requires a higher degree of cleanliness than carbon steel fabrication; use dedicated tools to prevent contamination

• Corrosion Testing: ASTM A923 Method C (ferric chloride at 50°C) testing is standard for verifying corrosion resistance

• Impact Testing: Commonly specified at -46°C for critical applications

• NACE Compliance: For sour gas service, confirm compliance with NACE MR0175 requirements

8. Shipping & Delivery

• Standard delivery time is typically 15–30 days for standard sizes; larger sizes and custom specifications may require extended lead time

9. Payment Terms

• Common international payment methods include T/T (Telegraphic Transfer) and L/C at sight (Letter of Credit)

10. Packaging

• Products are securely packed in plywood cases or wooden crates with internal cushioning to ensure safe transportation and prevent damage during transit

11. After-Sales / Return & Warranty Policy

• All products undergo strict quality inspection before shipment, with Mill Test Certificates (EN 10204 3.1/3.2) available

• Mandatory documentation includes chemistry, mechanical properties, ferrite content, and corrosion test results

• Third-party inspection (ABS, DNV, CCS, LR, BV, etc.) available upon request

• In case of quality issues, retain original packaging and provide relevant photos or third-party inspection reports

• Specific return, exchange, and warranty terms are subject to the final sales contract agreement.

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FAQ

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