Butt-welding Pipe Fittings 90D Long Radius Elbow 2" SCH40 Incoloy 825 Nickel

Product Specification

Butt-welding Pipe Fittings 90D Long Radius Elbow 2" SCH40 Incoloy 825 Nickel Alloy ASME B16.9

1. Product Description

This product is a 90-degree Long Radius (LR) butt-welding elbow manufactured from Incoloy 825 in accordance with ASME B16.9 standards . Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, offering an exceptional combination of high strength and outstanding corrosion resistance across a wide temperature range . 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 2" Schedule 40 fitting is designed for permanent butt-weld connection in demanding high-performance piping systems.

2. Key Product Parameters

3. Application / Usage

This 90° LR elbow is ideal for highly corrosive and elevated-temperature environments :

• Oil & Gas: Wellhead piping, risers, casing, tubing, sour service (NACE MR0175 compliant) 

• Chemical Processing: Sulfuric and phosphoric acid systems, pickling operations, fertilizer and ammonia plants 

• Pollution Control: Flue-gas desulfurization, scrubber systems 

• Nuclear Industry: Fuel reprocessing, radioactive waste handling 

• Power Generation: Heat exchangers, condenser piping 

4. Advantages

• Superior Corrosion Resistance: Excellent resistance to chloride-ion stress corrosion cracking, pitting, crevice corrosion, and intergranular corrosion; effective in both oxidizing and reducing environments 

• High-Temperature Performance: Maintains mechanical properties from cryogenic temperatures up to 538°C 

• Cost-Effective: Compared to higher nickel alloys like Inconel, Incoloy 825 offers a more economical solution while delivering excellent performance 

• Excellent Weldability: Titanium stabilization prevents intergranular corrosion in the heat-affected zone; weldable via conventional processes 

• Long Radius Design: R=1.5D ensures smooth flow, reduced turbulence, and minimized pressure drop

5. Functions

The 90° LR elbow changes the direction of fluid flow within a piping system by 90 degrees with minimal pressure drop. The long radius design reduces flow resistance, turbulence, and erosion, making it suitable for high-velocity and abrasive media applications.

6. Installation Instructions

1. Preparation: Degrease joint faces with isopropyl alcohol; mechanically clean using dedicated stainless steel brush to remove oxides and prevent iron contamination .

2. Edge Preparation: Machine bevel angle of 60-70° with root gap of 1.5-2.5 mm for GTAW .

3. Alignment: Accurately align the elbow with connecting pipes; maintain consistent fit-up.

4. Welding: Use GTAW (TIG) process with ERNiCrMo-3 (Inconel 625 type) filler metal (AWS A5.14) for highest fissure resistance and corrosion performance . Shielding: Pure argon; back purge with argon required for root pass to prevent oxidation .

5. Parameter Control: Keep heat input at 0.8-1.6 kJ/mm; maintain interpass temperature ≤ 150°C; use stringer beads (avoid wide weave) .

6. Post-Weld: No post-weld heat treatment required for corrosion resistance; remove heat tint while warm .

7. Precautions

• Cleanliness: Requires a higher degree of cleanliness than steel; use dedicated tools for nickel alloys to prevent iron pickup .

• Temperature Control: Interpass temperature must not exceed 150°C to prevent microfissuring; avoid operation above 538°C where brittle phases may form .

• Hot Cracking Sensitivity: Use over-alloyed filler (ERNiCrMo-3) and control heat input to minimize hot cracking risk .

• Preheat: Generally not required; on thick sections use 100-150°C to moderate thermal gradients .

• Back Purging: Essential for full-penetration joints to preserve corrosion resistance .

8. Shipping & Delivery

• Standard delivery time is typically 15–30 days, subject to order quantity, size, and specification availability.

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 100% strict quality inspection before shipment.

• 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.

FAQ

1. Are you trading company or manufacturer ?
    We are manufacturer ,You can see the certification.
2. How long is your delivery time?
    Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ?
    Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ?
    Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.