Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm b111 c68700 seamless copper alloy tube for heat exchangers in China. With abundant experience, we warmly welcome you to wholesale customized astm b111 c68700 seamless copper alloy tube for heat exchangers from our factory. For price consultation, contact us.
If you are looking for the ultimate solution to high-speed seawater erosion in thermal systems, GNEE offers high-quality ASTM B111 C68700 seamless aluminum brass tubes. Our C68700 tubes are specifically designed to address the "impact erosion" issue that frequently causes failure in standard naval brass (C44300) or C26000 tubes. With the addition of 1.8%–2.5% aluminum (Al), this chemical composition forms a strong, self-healing protective layer that enables the material to withstand turbulent and high-speed saltwater (over 2.5 m/s), making it the ideal choice for seawater desalination plants, offshore condensers, and marine evaporators.
GNEE provides high-quality ASTM B111 UNS C68700 aluminum brass copper-nickel alloy tubes, with the alloy containing approximately 76-79% copper, 2.0-3.0% aluminum, 1.0-1.5% nickel, and 0.5-1.0% iron. Manufactured using precision forming techniques, it features a high thermal conductivity (approximately 100-120 W/(m·K)).
ASTM B111 C68700 Seamless Copper Alloy Tube
UNS C68700 Aluminum Brass Copper Nickel U Bend Tube
GNEE's C68700 seamless tubes are available in both straight and U-bend configurations, with outer diameters ranging from 6 mm to 76.2 mm and wall thicknesses ranging from 0.5 mm to 5.0 mm. Surface treatment options include bright annealing, pickling, or precision polishing, ensuring smooth inner walls to optimize heat transfer performance.
ASTM B111 C68700 aluminum brass tube is suitable for working temperatures up to 200°C and is exported to the global power generation and shipbuilding industries, providing high-performance engineering solutions that significantly reduce maintenance downtime in harsh marine environments.
Manufacture:Seamless process ,Cold-drawn
Wall thickness(WT): 0.5 mm-12.7 mm.
Outer diameter (OD): 5 mm-80 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
Payment Terms: T / T, LC
Delivery: 25 days after payment
Surface: Tubes will be varnished to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required
Equivalent Grade of C68700
Material Designation
Corresponding Material Symbol
GB/T8890
ASTM B111
BS2871
JIS H3300
DIN1785
Aluminums Brass
HAL77-2
C68700
CZ110
C6870
CuZn20Al2
ASTM B111 UNS C68700 Aluminum Brass Copper Nickel U Bend Tube for Condenser Chemical Composition
Designation
Chemical Composition %
Cu
Sn
Al
As
Ni
Fe
Mn
Pb max.
Zn
C68700
76.0-79.0
–
1.8-2.5
0.02-0.06
–
0.06 max
–
0.07
Rem
ASTM B111 UNS C68700 Aluminum Brass Copper Nickel U Bend Tube Mechanical Properties
Copper or Copper Alloy UNS NO.
Temper Designation
Tensile Strength
Yield Strength
Elongation
in 2 in.,
Code
Former
min ksi(min MPa)
min ksi(min MPa)
min %
C68700
O61
annealed
50(345)
18(125)
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Note:
All tubes shall be supplied as per applicable ASTM B111 /B 111M Specification
Mill test certificates will be issued
We can provide 3.2 Certification according to the needs of you
We also supply copper alloy complementary products for heat exchanger applications.
Finned Tube,Tubesheet, EEMU 146 pipe fitting, EEMU 145 pipe flange etc.
Flattening Test
Test Method-Each test specimen shall be inspected per Test Method B968/B968M.
During inspection, the flattened areas of the test-specimen shall be free ofdefects, but blemishes ofa nature that do not interfere with the intended application are acceptable.
Tubes for ferrule stock are not subject to flattening test.
Residual Stress Test
A residual stress test, when specified in the purchase order, is required only for Copper Alloy UNS Nos. C68700 and when not supplied in an annealed temper.
ASTM B111 C68700 Seamless Brass Tube supplier
To ensure industrial-grade reliability for seamless aluminum brass tubing conforming to ASTM B111 C68700 standards, GNEE is a production plant with dual ISO 9001:2015 and TUV/PED certifications, equipped with an advanced 3000-ton horizontal extrusion press and multi-roll precision cold drawing machine, with dimensional tolerances as small as ±0.03 mm.
Packaging
Each pipe is protected with PE end caps and wrapped with a VCI (volatile corrosion inhibitor) film to prevent oxidation. These pipes are securely placed in fumigation-free plywood boxes conforming to ISPM 15 standards or reinforced steel boxes with internal honeycomb partitions to prevent surface abrasion during transportation.
Customer visit and sign the order
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