ASTM B111 is a standard developed by the American Society for Testing and Materials, officially titled 《Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock》. This standard covers seamless tubes made of copper and copper alloys primarily used in condensers, heat exchangers, and their components (such as ferrule stock). C68700 is a specific grade included in this standard and belongs to the aluminum brass material.
Why is ASTM B111 C68700 Aluminum Brass Tube Widely Used in the Heat Exchanger Industry?
Good corrosion resistance: It exhibits excellent resistance to corrosive media such as seawater, saline solutions, and acidic solutions. In seawater environments, a dense protective oxide layer forms on the material surface, effectively resisting seawater erosion. This makes it suitable for equipment including desalination plants, heat exchangers, condensers, and subsea pipelines on offshore platforms.
High strength: The tensile strength of C68700 copper alloy tubes ranges from 360 MPa to 600 MPa, and the yield strength ranges from 80 MPa to 540 MPa. Its good load-bearing capacity makes it suitable for applications involving certain pressures and loads.
Good processability: It is easy to cold work and can be formed into straight tubes, bent tubes, and other shapes to meet the needs of various application scenarios. Additionally, it has good weldability and can be welded using methods such as gas welding and TIG welding.
Good thermal and electrical conductivity: This gives C68700 seamless round copper tube promising application prospects in equipment requiring heat and electrical conduction, such as heat exchangers and condensers.
Chemical Composition of C68700 Hollow Round Aluminum Brass Tube
| UNS NO. | ASTM B111 C68700 CHEMICAL COMPOSITION % | |||||
|---|---|---|---|---|---|---|
| Cu | AI | Fe | Zn | As | Mn | |
| C68700 | 76.0-79.0 | 1.8-2.5 | 0.06 MAX | REM | 0.02-0.06 |
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C68700 belongs to brass, specifically aluminum brass. The two most critical elements in its chemical composition are aluminum (approximately 1.8% - 2.5%) and arsenic (approximately 0.02% - 0.10%). The core role of aluminum is to form a dense, high-strength, and highly adherent aluminum oxide protective film on the surface of C68700. This film significantly enhances the tube's resistance to erosion corrosion and fatigue corrosion in flowing seawater, brackish water, and other media. Meanwhile, the addition of aluminum effectively prevents the selective dissolution of zinc in environments containing chloride ions, low pH, and high temperatures, greatly inhibiting dezincification corrosion while also increasing the strength and hardness of C68700. The addition of arsenic is to inhibit dezincification corrosion, as arsenic, regardless of its content, forms a protective barrier layer on the metal surface, further enhancing its resistance to dezincification corrosion. This enables C68700 to be widely used in seawater environments.
In Which Fields Is ASTM B111 C68700 Bare Aluminum Copper Tube Mainly Applied?
Condensers and evaporators: ASTM B111 C68700 copper tubes are commonly used as components in condensers and evaporators due to their excellent thermal conductivity and corrosion resistance. In such equipment, the tubes must withstand the flow of high-temperature and high-pressure refrigerants while resisting corrosive effects from the refrigerant. Therefore, the performance characteristics of ASTM B111 C68700 copper-nickel tubes make them an ideal choice.
Heat exchangers: In the chemical industry, heat exchangers are common equipment. ASTM B111 C68700 copper-aluminum tubes are often used as components in heat exchangers due to their high strength and good corrosion resistance. These tube components must withstand the flow of high-temperature and high-pressure chemical media while resisting corrosive effects from the media. Thus, the performance characteristics of ASTM B111 C68700 copper-aluminum tubes make them the preferred material in the chemical industry.
Desalination plants: In the desalination process, a large number of heat exchangers and condensers are required to remove salt from seawater. ASTM B111 C68700 copper-aluminum tubes are often used as components in such equipment due to their good resistance to corrosive media like seawater. The protective oxide layer formed on their surface effectively resists seawater erosion, thereby extending the service life of the equipment.
Offshore platforms: On offshore platforms, various equipment and pipelines must withstand the corrosive effects of the marine environment. ASTM B111 C68700 copper-nickel tubes are often used as components in heat exchangers, condensers, and subsea pipelines on offshore platforms due to their excellent corrosion resistance.
Distiller pipelines: In distillation processes, pipelines are needed to transport steam and condensate. ASTM B111 C68700 copper-aluminum tubes are commonly used as distiller pipeline components due to their excellent thermal conductivity and corrosion resistance.
Other applications requiring corrosion-resistant and high-strength materials: Due to their excellent corrosion resistance and high strength, ASTM B111 C68700 copper-aluminum tubes can also be used in other scenarios requiring these properties, such as heat exchangers and condenser equipment in the food processing and pharmaceutical industries.
Copper products that GNEE can provide
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High quality 99.9% pure copper pipe / straight copper tube / copper alloy pipe |
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Standard |
ASTM,DIN,BS,CDA,JIS,GB |
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Material |
T1,T2,C10100,C10200,C10300,C10400,C10500,C10700,C10800, |
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Shape |
Round,Square,Rectangular,etc. |
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Specifications |
Round:wall thickness:0.2mm~120mm,outside diameter:2mm~910mm
Square:wall thickness:0.2mm~120mm,size:2mm*2mm~1016mm*1016mm Rectangularwall thickness:0.2mm~120mm,size:2mm*4mm~1016mm*1219mm |
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Length |
3m,5.8m, 6m, 11.8m, 12m, or as required. |
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Hardness |
1/16 hard,1/8 hard,3/8 hard,1/4 hard,1/2hard,full hard,soft,etc |
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Surface |
mill,polished,bright,oiled,hair line,brush,mirror,sand blast,or as required. |
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Price term |
EXW, FOB, CFR, CIF, etc. |
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Payment term |
T/T |
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Package |
Export standard package: bundled wooden box, suit for all kinds of transport, |
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Delivery time |
According to order quantity |
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Export to |
Singapore,Indonesia,Ukraine,Korea,Thailand, Vietnam, Saudi Arabia, Brazil, Spain, |
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Application |
Copper pipe is the first choice of residential housing water pipes, heating, cooling pipes |
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Straight copper rod/copper round bar |
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Standard |
ASTM,DIN,BS,CDA,JIS,GB |
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Material |
T1,T2,C10100,C10200,C10300,C10400,C10500,C10700,C10800, |
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Shape |
Round,Square,Rectangular,etc. |
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Specifications |
Diameter:3~200mm |
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Length |
3m,5.8m, 6m, 11.8m, 12m, or as required. |
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Hardness |
1/16 hard,1/8 hard,3/8 hard,1/4 hard,1/2hard,full hard,soft,etc |
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Surface |
mill,polished,bright,oiled,hair line,brush,mirror,sand blast,or as required. |
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Price term |
EXW, FOB, CFR, CIF, etc. |
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Payment term |
T/T |
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Package |
Export standard package: bundled wooden box, suit for all kinds of transport, |
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Delivery time |
According to order quantity |
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Export to |
Singapore,Indonesia,Ukraine,Korea,Thailand, Vietnam, Saudi Arabia, Brazil, Spain, |
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Application |
A copper rod is a type of colored metal processing bar stock with high electrical conductivity. It is mainly divided into brass |
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Size |
Width: 10mm to 2000mm, |
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Hardness |
1/16 hard,1/8 hard,3/8 hard,1/4 hard,1/2hard,full hard. |
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Surface |
Polished,bright,oiled,hair line,brush,mirror,or as required |
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Package |
Plastic film with Wooden case or wooden pallet |
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Delivery time |
Prompt delivery or upon your order quantity. |
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Quality Control |
Mill Test Certification is supplied with shipment,Third Part Inspection is acceptable. |
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Application |
widely used inair conditioners,refrigerators,electric,solar water heater, polished pipe an be used in decorative,such as stair |
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Shape |
Round, Square, Oval, can be customized |
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Item |
Copper Wire |
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Standard |
ASTM,DIN,BS,CDA,JIS,GB |
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Material |
T1,T2,C10100,C10200,C10300,C10400,C10500,C10700,C10800, |
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Shape |
Round |
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Specifications |
As required. |
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Length |
As required. |
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Hardness |
1/16 hard,1/8 hard,3/8 hard,1/4 hard,1/2hard,full hard,soft,etc |
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Surface |
mill,polished,bright,oiled,hair line,brush,mirror,sand blast,or as required. |
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Price term |
EXW, FOB, CFR, CIF, etc. |
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Payment term |
T/T |
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Package |
Export standard package: bundled wooden box, suit for all kinds of transport, |
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Delivery time |
According to order quantity |
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Application |
Copper wire, as a conductive material, is widely used in power transmission and electronic devices. Transformers, inductors, |
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Copper CNC machined parts
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Custom CNC Machining Parts of Most Materials
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Quotation
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According to your drawing(size, material, thickness, processing content, and required technology, etc)
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Materials Avaiable
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Brass,Stainless Steel,Q235&Q345 steel, Zinc-plate Sheet,Stainless Steel, Aluminum,Copper, etc.
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Surface Treatment
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Zinc Plating, chrome plate, powder coating, anodizing, wire drawing, silk-screen printing, etc
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Processing
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Laser Cutting, Precision Stamping, CNC Bending, CNC Milling, CNC Turning, Threading, Riveting, Drilling, CNC Punching,Die Casting, Laser Welding, etc.
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Testing Equipment
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CMM/Tool microscope/multi-joint arm/Automatic height gauge/Manual height gauge/Dial gauge/Roughness measurement
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Drawing Formats
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PRO/E, Auto CAD, Solid Works , UG, CAD / CAM / CAE, PDF
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Our Advantages
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1.) 24 hours online service & Quickly Quote/Delivery.
2.) 100% QC quality inspection before delivery, and can provide quality inspection form.
3.) 18+ years of experience in the CNC machining area and have a senior design team to offer perfect modification suggestions. |
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Tolerance丨Surface Roughness
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Generally +/-0.1-0.2mm
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Sample service
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Avaliable before bulk order. Samples charge according your design, The sample fee can be used as the payment for mass goods.
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About Us
Founded in 2008, we specialize in exporting premium copper products. Our manufacturing leverages continuous casting lines and precision drawing machines. Rigorous quality control, including eddy current testing and spectrometer analysis, guarantees the superior performance of our copper tubes and coils for global applications.
If you need any help, please contact us immediately!
Email address：sales@gneemetal.com
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