C68700 is an aluminum brass alloy with arsenic addition, specifically designed for harsh environments such as seawater desalination. Its composition (Cu: 76-79%, Al: 1.8-2.5%, As: 0.02-0.06%, Zn: balance) ensures exceptional corrosion resistance in seawater and high thermal conductivity. The arsenic content further enhances resistance to dezincification, a critical feature for long-term durability in marine applications.
The production process of C68700 Brass Tube
Raw Materials
Melting&Casting
Extrusion
Rolling
Intermediate Heat Treatment 1
Straightening
Three-line Drawing
Acid Washing
Intermediate Heat Treatment 2
Two Cascade Drawing
Cutting&Cleaning
Eddy Current Test
Final Heat Treatment
Packing
Shipping
Comparison Table of Brass Tube Alloy
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Implementation Standard |
Alloy Specifications |
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GB/T 5231 |
HAI 77-2 |
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HSn70-1, HSn72-1 |
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ASTM B111 |
C68700 |
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C44300 |
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BS EN12451 |
CuZn20Al2As |
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CuZn28Sn1As |
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JIS H3300 |
C6870, C6871, C6872 |
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C44300 |
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AS 1569 |
C68700 |
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C44300 |
Chemical Composition of Brass Tube Alloys
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Implementation Standard |
Alloy |
Cu (%) |
Al/Sn (%) |
As (%) |
Fe (%) |
Pb (%) |
Other Impurities (%) |
Zn (%) |
Total Impurities (%) |
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GB/T 5231 |
HAl77-2 |
76.0-79.0 |
1.8-2.5 (Al) |
0.02-0.06 |
≤0.06 |
≤0.07 |
≤0.07 (Other) |
Balance |
≤0.6 |
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ASTM B111 |
C68700 |
76.0-79.0 |
1.8-2.5 (Al) |
0.02-0.06 |
≤0.06 |
≤0.07 |
≤0.07 (Other) |
Balance |
≥99.5 (Sum) |
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ASME SB111 |
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JIS H3300 |
C6870 |
76.0-79.0 |
1.8-2.5 (Al) |
0.02-0.06 |
≤0.05 |
≤0.05 |
≤0.05 (Other) |
Balance |
- |
|
JIS H3300 |
C6871 |
76.0-79.0 |
1.8-2.5 (Al) |
0.02-0.06 |
≤0.05 |
≤0.05 |
≤0.05 (Other); Si: 0.20-0.50 |
Balance |
- |
|
JIS H3300 |
C6872 |
76.0-79.0 |
1.8-2.5 (Al) |
0.02-0.06 |
≤0.05 |
≤0.05 |
≤0.05 (Other); Ni: 0.20-1.0 |
Balance |
- |
|
BS EN12451 |
CuZn20Al2As (CW702R) |
76.0-79.0 |
1.8-2.3 (Al) |
0.02-0.06 |
≤0.07 |
≤0.05 |
Ni ≤0.1; P ≤0.01; Mn ≤0.1; ≤0.3 (Other total) |
Balance |
- |
|
AS 1569 |
C68700 |
76.0-79.0 |
1.8-2.5 (Al) |
0.02-0.06 |
≤0.06 |
≤0.07 |
≤0.07 (Other) |
Balance |
- |
|
GB/T 5231 |
HSn70-1 |
69.0-71.0 |
0.8-1.3 (Sn) |
0.03-0.06 |
≤0.10 |
≤0.05 |
≤0.05 (Other) |
Balance |
≤0.3 |
|
GB/T 5231 |
HSn72-1 |
70.0-73.0 |
0.9-1.2 (Sn) |
0.02-0.06 |
≤0.06 |
≤0.07 |
≤0.07 (Other) |
Balance |
≤0.4 |
|
ASTM B111 |
C44300 |
70.0-73.0 |
0.9-1.2 (Sn) |
0.02-0.06 |
≤0.06 |
≤0.07 |
≤0.07 (Other) |
Balance |
≥99.6 (Sum) |
|
ASME SB111 |
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JIS H3300 |
C4430 |
70.0-73.0 |
0.9-1.2 (Sn) |
0.02-0.06 |
≤0.05 |
≤0.05 |
≤0.05 (Other) |
Balance |
- |
|
BS EN12451 |
CuZn28Sn1As (CW706R) |
70.0-72.5 |
0.9-1.3 (Sn) |
0.02-0.06 |
≤0.07 |
≤0.05 |
Ni ≤0.1; P ≤0.01; Mn ≤0.1; ≤0.3 (Other total) |
Balance |
- |
|
AS 1569 |
C44300 |
70.0-73.0 |
0.8-1.2 (Sn) |
0.02-0.06 |
≤0.06 |
≤0.07 |
≤0.07 (Other) |
|
C68700 Thick Wall Aluminum Brass Tube for Seawater Desalination
Heat Exchangers and Condensers
C68700 tubes are widely used in multi-stage flash (MSF) and reverse osmosis (RO) systems. Their high thermal conductivity (64 BTU·in/(hr·ft²·°F)) ensures efficient heat transfer between seawater and desalination equipment
The seamless structure eliminates weld seams, reducing leakage risks in high-pressure environments
Corrosion Resistance
The aluminum content forms a protective oxide layer, while arsenic prevents dezincification. This combination allows the tubes to withstand saltwater, chlorine, and sulfide exposure, even at high flow velocities
Example: In seawater intake pipelines, C68700 resists pitting and crevice corrosion, extending equipment lifespan
Mechanical Performance
Tensile Strength: 345–600 MPa (minimum 345 MPa for annealed tubes)
Yield Strength: 125–540 MPa, suitable for high-pressure condensers and evaporators.
Fatigue Resistance: Maintains structural integrity under cyclic thermal and mechanical stresses.
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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