Shipbuilding Grade Cupro Nickel 70/30 Plate C71500 ASTM B171 Heat Exchanger

Product Specification

Shipbuilding Grade Cupro Nickel 70/30 Plate C71500 ASTM B171 Heat Exchanger Sheet

1. Product Description
Copper Nickel Plate is a wrought copper‑nickel‑iron‑manganese alloy plate designed for long‑term exposure to seawater and industrial brines. The alloy is characterized by its stable, self‑renewing protective surface film that provides excellent resistance to uniform corrosion, pitting, and crevice corrosion. The most common grades are CuNi90/10 (UNS C70600) and CuNi70/30 (UNS C71500), with iron content carefully controlled to maximize resistance to high‑velocity water. Plates are manufactured by hot rolling, with optional cold rolling for gauges under 4 mm. They are supplied in annealed (soft), stress‑relieved, and cold‑rolled tempers. Surface finishes include hot rolled descaled, cold rolled 2B, polished, satin brushed, and chequered (diamond or teardrop pattern). Typical applications involve seawater piping systems, heat exchanger plates, and structural components in marine environments.
 
2. Product Applications

• Desalination (Multi‑Stage Flash – MSF): Rejection section liners, brine heater tube plates, vent condenser plates.

• Offshore platforms (topsides): Seawater lift pump columns, deluge skid piping supports, firewater jockey pump bases.

• Shipbuilding: Rudder bearing plates, stabilizer fin housings, seawater strainer covers.

• Coastal power plants: Travelling water screen panels, condenser waterbox linings, circulating water pump column plates.

• Marine renewable energy: Wave energy converter (WEC) absorber plates, tidal kite structural panels.

• Chemical tankers (IMO Type II): Cargo tank heating coil support plates, stripping line components.

3.Product Advantages

• Excellent resistance to galvanic corrosion when properly coupled – Compatible with copper alloys, lead, tin, and certain stainless steels under controlled conditions.

• High resistance to sulphide‑induced stress corrosion cracking – Suitable for intermittent polluted seawater.

• Low magnetic permeability (μ ≈ 1.0) – Essential for degaussing applications and sensitive instrumentation areas.

• Excellent ductility at cryogenic temperatures – No ductile‑to‑brittle transition down to −250°C.

• Can be clad onto steel substrates by roll bonding or explosion welding – Cost‑effective bi‑metal plates.

• Good work hardening characteristics – Allows controlled strengthening by cold rolling without heat treatment.

• Long service life documented in coastal infrastructure – 40+ years in tidal zone applications without failure.

4. Key Product Parameters

 
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.