Introduction
ASTM B111 C70600 (O61) Seamless Tube is a copper-nickel (CuNi 90/10) alloy tube widely used in heat exchangers, condensers, marine systems, and desalination plants. DLSS supplies this tube in size 12.7 mm OD × 1.0 mm wall thickness × 2400 mm length, manufactured according to ASTM B111 standards and delivered in O61 annealed condition.
Each tube undergoes 100% Eddy Current Testing (ET) to detect surface or subsurface defects and has successfully passed third-party inspection (SGS, BV, TUV, etc.), ensuring compliance with international project requirements.
What is ASTM B111 C70600 (O61)?
C70600 (UNS C70600, CuNi 90/10) is a copper-nickel alloy containing approximately:
-
90% Copper
-
10% Nickel
-
Small additions of Iron and Manganese for improved seawater resistance
Key properties:
-
Excellent resistance to seawater corrosion, erosion, and biofouling
-
High ductility in O61 annealed condition for easy fabrication
-
Proven reliability in offshore and power generation projects
Specifications
| Item | Details |
|---|---|
| Standard | ASTM B111 |
| Material | C70600 Copper-Nickel (90/10) |
| Condition | O61 (Annealed) |
| Type | Seamless Tube |
| Size | 12.7 mm OD × 1.0 mm WT × 2400 mm Length |
| Testing | 100% Eddy Current Testing (ET) |
| Inspection | Passed Third-Party Inspection (SGS/BV/TUV) |
| Applications | Heat exchangers, condensers, desalination, marine cooling, power plants |
Key Features
-
Seamless CuNi 90/10 Tube – strong, reliable, and corrosion-resistant.
-
O61 Annealed Condition – provides ductility for bending and fabrication.
-
100% Eddy Current Tested – ensures defect-free performance.
-
Third-Party Certified – independently verified quality for critical projects.
-
Proven Long-Term Durability – used in marine, offshore, and desalination systems worldwide.
Applications
-
Heat Exchangers & Condensers – for refineries, chemical plants, and power stations.
-
Desalination Units – resistant to brine and seawater corrosion.
-
Marine Engineering – shipboard condensers and seawater cooling systems.
-
Power Plant Cooling – seawater-cooled condensers and circulating water systems.
-
Offshore Oil & Gas Platforms – piping exposed to seawater and harsh conditions.
Why Choose DLSS?
-
Wide supply of CuNi 90/10 tubes in multiple sizes and conditions.
-
Strict quality control – 100% ET, hydrostatic testing, PMI, dimensional checks.
-
Third-party inspections – SGS, BV, TUV certification available.
-
Export packaging – capped ends, plastic wrapping, seaworthy wooden cases.
-
Global references – trusted supplier for EPC contractors and end-users.
Frequently Asked Questions (FAQ)
Q1: Why is C70600 (CuNi 90/10) used in seawater systems?
A1: Because it has excellent resistance to seawater corrosion, erosion, and biofouling.
Q2: What does O61 mean?
A2: O61 indicates annealed condition, making the tube easier to bend and fabricate.
Q3: Why is Eddy Current Testing (ET) important?
A3: It ensures the tube is free from surface or near-surface defects before installation.
Q4: Can DLSS supply U-bend tubes for heat exchangers?
A4: Yes, we provide straight, U-bend, and finned CuNi tubes.
