C68700 Aluminum Brass

C68700 Aluminum Brass

76–79%
Copper Content
1.8–2.5%
Aluminum Content
O/H55/ H58
Temper
C68700 aluminum brass is a copper-zinc-aluminum alloy offering excellent seawater corrosion resistance, erosion resistance, and heat transfer performance. It is widely used in condenser tubes, heat exchangers, desalination plants, and marine cooling systems.
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Lead Time: 3-5 Business Days

Product Overview

C68700 aluminum brass is a copper-zinc alloy containing approximately 77% copper with controlled aluminum additions to enhance corrosion resistance and durability in aggressive marine environments. It is manufactured to ASTM B111 and related standards for heat transfer and seawater service applications.

Produced through extrusion, tube drawing, and annealing processes, C68700 brass offers excellent resistance to seawater corrosion, impingement attack, and biofouling. Its combination of thermal conductivity, mechanical strength, and long-term durability makes it one of the most widely used alloys for condenser and heat exchanger tubing.

C68700 aluminum brass is extensively used in power plant condensers, marine cooling systems, desalination facilities, offshore installations, and industrial heat exchangers where efficient heat transfer and corrosion resistance are critical.

Key Features

Excellent seawater corrosion resistance
Superior impingement and erosion resistance
High thermal conductivity
Good resistance to biofouling
Reliable mechanical strength
Long service life in cooling water systems

Available Sizes

Copper Shape Thickness (mm) Width/Diameter (mm) Length (m)
Bar - Φ5-200 1-6
Wire - Φ0.05-10 Customize
Sheet 0.25-6 500-2500 1-6
Plate 6-200 200-3000 1-6
Strip 0.15-6 8-610 Customize
Tube OD: φ2-600; WT:φ0.2-100mm - 1-6
Coil 0.15-6 3-1250 1-6
Foil < 0.15 10-1350 Customize
Profile Customized Customize Customize

* Custom sizes available upon request. Contact our sales team for special requirements.

Technical Specifications

Precision data for engineering decisions. All values tested per ASTM standards.

01 Material Properties

Specification Value Notes
Sn Content 76–79% Admiralty brass composition
Pb Content 1.8–2.5% Improves corrosion resistance
Zn Content Remainder Balanced mechanical properties
Density 8.33 g/cm³ Typical value
Electrical Conductivity ~24% IACS Based on temper
Thermal Conductivity ~115 W/m·K Excellent heat transfer
Tensile Strength 350-550 MPa Depends on temper
Elongation ≥25% Typical annealed/extruded condition
Fabrication Tube Drawing / Bending / Welding Good workability
ASTM Standard ASTM B111 EN & JIS available

Applications & Use Cases

Proven solutions across diverse industries. From aerospace to marine environments.

Frequently Asked Questions

Find answers to common questions about C68700 aluminum brass tube specifications, seawater performance, and applications.

C68700 is specified to ASTM B111 / ASME SB111 for seamless condenser and heat-exchanger tubes, with O61 (annealed) as the standard condenser temper. It is the wrought 'aluminum brass' grade, also known as CuZn20Al2, EN CW702R, or BS CZ110.
C68700 adds 1.8-2.5% aluminum plus arsenic inhibition, giving it very high resistance to impingement attack in high-velocity seawater (typically above about 2.5 m/s). C44300 is preferred for chemically aggressive, polluted, or low-velocity water. Selection depends on whether erosion or chemical dezincification is the limiting factor.
Annealed O61 C68700 has a minimum tensile strength of 345 MPa (50 ksi) and minimum yield strength of 125 MPa (18 ksi), with 25-45% elongation. Density is about 8.33 g/cm3 and electrical conductivity is roughly 23% IACS.
It is widely used for seawater, desalination, and industrial cooling water rather than as a potable-water grade. Like other brass, C68700 solders and brazes well, but fusion welding is limited; joint design should account for zinc and arsenic fuming.
Linsy produces C68700 aluminum brass to ASTM B111 as made-to-order tubes, bars, and plates with a standard lead time of 10-60 days based on size and quantity, and low MOQ for custom profiles. Each shipment includes an MTR / MTC, with SGS reports available on request; RoHS / REACH compliance statements and a quote (typically within 1 hour, with responses inside 24 hours) are provided on inquiry.
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