ASTM B111 C68700 is a high-performance arsenic-aluminum brass (CuZn20Al1As) seamless tube specifically designed for critical heat transfer applications in condensers, heat exchangers, and other thermal systems. This alloy combines copper (Cu), zinc (Zn), aluminum (Al), and a controlled addition of arsenic (As) to achieve exceptional corrosion resistance, erosion resistance, and thermal conductivity, making it particularly suitable for marine, power plant, and industrial cooling systems.
Key Advantages of ASTM B111 C68700 Straight Copper Tube
Exceptional Corrosion Resistance
Dezincification Resistance: The addition of arsenic (As) prevents dezincification in seawater and corrosive cooling media.
Erosion-Corrosion Resistance: The aluminum oxide (Al) layer resists impingement erosion from high-speed water flow (>3 m/s).
Excellent Thermal Conductivity
Thermal conductivity is approximately 100 W/m·K, close to that of pure copper and far exceeding stainless steel (15 W/m·K) and titanium (22 W/m·K).
The smooth, seamless internal structure minimizes fouling, ensuring sustained heat transfer efficiency.
High Strength and Fabrication Flexibility
Cold Work Hardening: Tensile strength can reach 650 MPa (hard temper) through cold drawing.
Annealed temper (O61) allows tube bending/flaring for complex heat exchanger layouts.
Long Service Life and Low Maintenance
Service life in seawater exceeds 20 years (3 to 5 times longer than carbon steel).
No need for cathodic protection or coatings, reducing lifecycle costs.
Chemical Composition of ASTM B111 C68700 (Aluminum Brass)
| Element | Composition (%) (Minimum) | Composition (%) (Maximum) |
|---|---|---|
| Copper (Cu) | 76.0 | 79.0 |
| Zinc (Zn) | - | Remainder |
| Aluminum (Al) | 1.8 | 2.5 |
| Arsenic (As) | 0.02 | 0.10 |
| Iron (Fe) | - | 0.06 |
| Lead (Pb) | - | 0.07 |
| Manganese (Mn) | - | 0.05 |
| Tin (Sn) | - | 0.05 |
| Nickel (Ni) | - | 0.30 |
| Phosphorus (P) | - | 0.02 |
| Silicon (Si) | - | 0.05 |
| Other Impurities | - | 0.15 |
| Total Other Impurities | - | 0.50 |
Mechanical Properties of ASTM B111 C68700 (Typical for Seamless Tube)
| Property | Value | Unit | Condition / Temper |
|---|---|---|---|
| Tensile Strength | 380 - 520 | MPa (55 - 75 ksi) | Annealed (O61) |
| Yield Strength (0.2% Offset) | 140 - 480 | MPa (20 - 70 ksi) | Varies greatly with temper: ~140 MPa (Annealed) ~480 MPa (Drawn, Hard Temper) |
| Elongation | 45 - 65 | % in 2 inches | Annealed (O61) |
| Hardness | 65 - 90 | HRB (Rockwell B) | Annealed (O61) |
| Modulus of Elasticity | 110 | GPa (16 x 10⁶ psi) | - |
| Density | 8.33 | g/cm³ (0.301 lb/in³) | - |
| Thermal Conductivity | ~100 | W/m·K | - |
Main Applications of ASTM B111 C68700 Straight Copper Brass Tube
Power Industry
Fossil fuel power plant condensers: Resistant to high-pressure steam, ammonia erosion, and sulfide corrosion.
Nuclear power plant heat exchange systems: Used in secondary cooling circuits, resistant to chloride corrosion.
Marine and Offshore Engineering
Ship central coolers: Resistant to seawater corrosion and biofouling, reducing maintenance.
Desalination plants: Resistant to high-salinity media, maintaining heat transfer performance.
Petrochemical Industry
Refinery heat exchangers: Resistant to hydrogen sulfide and acidic fluid corrosion.
LNG liquefaction equipment: Maintains ductility at low temperatures (above -40°C).
Industrial Refrigeration and HVAC
Industrial chillers: High thermal conductivity reduces energy consumption.
Lithium bromide absorption chillers: Resistant to lithium bromide solution corrosion, service life >15 years.
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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