C71500 CuNi 70/30 Raised Face Weld Neck Flange, Forged Copper Nickel Pipe Flange

C71500 CuNi 70/30 Raised Face Weld Neck Flange, Forged Copper Nickel Pipe Flange

1. Product Description

The C71500 CuNi 70/30 Raised Face Weld Neck Flange is a high-performance forged copper-nickel pipe flange designed for demanding industrial piping systems. Manufactured from UNS C71500 (70% copper, 30% nickel) alloy, this weld neck flange combines excellent corrosion resistance with superior mechanical strength. The raised face sealing surface ensures reliable leak-tight connections, while the weld neck design provides smooth stress transition and reinforcement at the weld joint, making it ideal for high-pressure and high-temperature applications. Each flange is precision-forged and fully machined to meet ASME B16.5 standards, ensuring dimensional accuracy and consistent quality.

2. Key Specifications

3. Applications

These copper-nickel flanges are widely used in marine engineering, shipbuilding, offshore oil and gas platforms, seawater desalination plants, power plant condensers, heat exchangers, and chemical processing industries. The 70/30 Cu-Ni alloy is specifically chosen for environments requiring outstanding resistance to seawater, brackish water, and various corrosive media.

4. Product Advantages

• Exceptional seawater corrosion resistance, significantly outperforming carbon steel and stainless steel in marine environments

• High mechanical strength with tensile strength ≥485 MPa and yield strength ≥215 MPa for reliable long-term service

• Excellent resistance to biofouling and stress corrosion cracking

• Forged construction ensures uniform grain structure and superior toughness

• Precision-machined raised face guarantees reliable sealing performance per ASME B16.5 requirements

5. Product Functions

• Provides secure, leak-proof flange connections in high-pressure piping systems

• Transfers loads smoothly from the pipe to the flange through the weld neck design

• Resists pitting, crevice corrosion, and erosion in aggressive fluid environments

• Enables easy assembly and disassembly for pipeline maintenance and inspection

• Maintains structural integrity under thermal cycling and vibration conditions

6. Usage Instructions

• Inspect the flange upon receipt for any shipping damage or surface defects

• Ensure the pipe end is properly beveled to match the weld neck preparation

• Align the flange perpendicular to the pipe axis before welding

• Use appropriate welding procedures and filler materials compatible with copper-nickel alloys

• Tighten bolts evenly in a cross-pattern sequence to recommended torque values

• Perform a pressure test after installation to verify joint integrity

7. Precautions

• Avoid contact with carbon steel tools or materials to prevent galvanic corrosion

• Store in a dry, well-ventilated area away from acids and corrosive chemicals

• Do not use damaged flanges with scratched or pitted sealing faces

• Ensure proper bolt torque – over-tightening may deform the raised face

• Use compatible gaskets suitable for copper-nickel alloy service conditions

• Professional welding and installation by qualified personnel is strongly recommended

8. Shipping Information

Delivery time is 15-30 working days after order confirmation. Our regular shipping package consists of standard export packaging with plywood cases or pallets, ensuring protection during transit. For urgent orders, expedited shipping options are available upon request. We ship via sea, air, or courier based on customer preference and order quantity. All shipments are fully insured and tracked.

9. Payment Terms

We accept T/T (Telegraphic Transfer) and Western Union. For T/T, a 30% deposit is required upon order confirmation, with the 70% balance due before shipment. Payment terms are negotiable for long-term cooperation and larger orders. Bank charges at the sending end are to be borne by the buyer.

10. Packaging Details

Our standard packaging ensures the flanges remain rust-free and damage-free during ocean or air freight.

11. After-Sales Policy

We offer a 12-month warranty against manufacturing defects from the date of delivery. If any quality issues are found, please provide photos or video evidence within 7 days of receipt. We will arrange for replacement or refund after verification. For returns, products must be in original condition and packaging. Return shipping costs are to be borne by the buyer unless the return is due to our error. We are committed to providing prompt and fair solutions for all after-sales matters.