Introduction
ASTM B111 C70600 (H55) Seamless Tube is a high-performance copper-nickel (CuNi 90/10) alloy tube widely used in heat exchangers, condensers, desalination plants, and marine cooling systems. DLSS supplies tubes in 35 mm OD × 1.0 mm wall thickness × 1150 mm length, manufactured according to ASTM B111 standards.
All tubes are delivered in H55 temper (hard-drawn) condition for enhanced strength, and undergo 100% Eddy Current Testing (ET) to ensure defect-free supply. In addition, the tubes have successfully passed third-party inspections (SGS, BV, TUV), guaranteeing compliance with international project requirements.
What is ASTM B111 C70600 (H55)?
C70600 (UNS C70600, CuNi 90/10) is a copper-nickel alloy containing:
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~90% Copper
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~10% Nickel
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Small additions of Iron and Manganese
These elements provide:
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Excellent resistance to seawater corrosion, erosion, and biofouling
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Good mechanical strength and ductility
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Proven performance in marine, offshore, and industrial cooling applications
The H55 condition indicates a hard-drawn temper, providing higher strength compared to annealed tubes.
Specifications
| Item | Details |
|---|---|
| Standard | ASTM B111 |
| Material | C70600 (CuNi 90/10) |
| Condition | H55 (Hard-Drawn) |
| Type | Seamless Tube |
| Size | 35 mm OD × 1.0 mm WT × 1150 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
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Seamless Construction – ensures leak-proof performance under pressure.
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Superior Corrosion Resistance – CuNi 90/10 alloy resists seawater attack and fouling.
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H55 Hard-Drawn Condition – provides improved mechanical strength and durability.
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100% Eddy Current Tested – ensures every tube is defect-free.
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Third-Party Certified – compliance guaranteed for EPC and end-user projects.
Applications
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Heat Exchangers & Condensers – for petrochemical, refinery, and power industries.
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Desalination Plants – brine-resistant CuNi tubes for long service life.
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Marine Engineering – shipboard cooling, condensers, and seawater systems.
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Offshore Oil & Gas – subsea and platform cooling applications.
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Power Plant Cooling Systems – seawater-cooled condensers and tube bundles.
Why Choose DLSS?
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Supply of complete C70600 CuNi tube packages – straight tubes, U-bend, finned tubes.
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Strict QC – 100% ET, hydrostatic, dimensional, and PMI checks.
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Certified Quality – EN 10204/3.1 MTC + SGS/BV/TUV third-party inspection.
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Global Projects – trusted supplier for desalination, marine, and industrial heat exchanger systems.
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Export Packaging – tubes capped, plastic wrapped, seaworthy wooden cases.
Frequently Asked Questions (FAQ)
Q1: What does H55 mean for C70600 tubes?
A1: H55 indicates a hard-drawn temper, giving higher strength compared to annealed tubes (O61).
Q2: Why use Eddy Current Testing (ET)?
A2: 100% ET detects surface and subsurface defects, ensuring defect-free tubing.
Q3: What third-party inspections are available?
A3: SGS, BV, TUV, or client-nominated agencies can certify the tubes.
Q4: Can DLSS supply U-bend C70600 tubes for heat exchangers?
A4: Yes, we provide straight, U-bend, and finned tubes for complete heat exchanger solutions.
