ASTM B466 C70600 Seamless CuNi 90/10 Pipe Corrosion-Resistant for Seawater

Introduction & Standard Specification

This product is a seamless pipe made from Copper-Nickel Alloy UNS C70600 (commonly known as CuNi 90/10), manufactured in strict accordance with the ASTM B466 / B466M standard. This specification covers seamless copper-nickel pipes and tubes for general engineering purposes. As a seamless product, it is manufactured from cast billets by processes like hot extrusion or piercing, followed by cold working and annealing, ensuring high integrity and uniformity without a welded seam.

The alloy is renowned for its excellent corrosion resistance in seawater and marine environments, making it a superior and cost-effective choice over stainless steel in applications prone to chloride stress-corrosion cracking. It offers a balanced combination of good fabricability, moderate strength, and high resistance to biofouling and various forms of corrosion.

Material & Chemical Composition (CuNi 90/10)

Copper-Nickel UNS C70600, or CuNi 90/10, is a single-phase alpha-structured alloy. Its excellent seawater corrosion resistance is attributed to the significant presence of iron and manganese. The typical chemical composition is as follows:

Note: Other trace elements are controlled to specified limits per relevant standards.

Mechanical & Physical Properties

The mechanical properties can vary depending on the temper condition (e.g., soft annealed, hard drawn).

Key Applications

Due to its proven performance, ASTM B466 C70600 pipe is the primary product for commercial marine applications. Key application scenarios include:

• Seawater Pipework Systems: For offshore platforms, shipboard services, and desalination plants.

• Heat Exchangers & Condensers: In power generation, marine, and coastal facilities.

• Hydraulic & Firewater Lines: Especially in offshore and marine environments requiring high reliability.