C68700 Aluminum Brass Tube PDF
Products Description
C68700 is a wrought alloy based on copper (Cu) and zinc (Zn), with the key alloying element aluminum (Al) added. It typically also contains trace amounts of arsenic (As) or tin (Sn) to further enhance corrosion resistance. Its name reflects the main alloying elements: approximately 76% copper (Cu), approximately 22% zinc (Zn), and a core of 1.8–2.5% aluminum (Al). The addition of aluminum forms a dense, robust, and self-healing alumina (Al₂O₃) protective film on the alloy surface, which is the fundamental reason for its excellent resistance to seawater corrosion. It belongs to the "Naval Brass" family and is specifically designed to withstand harsh marine environments.
Customer Visit & Project Reference – India
We successfully supplied ASTM B111 C68700 aluminum brass tubes to a customer in India for shell & tube condenser applications. During the project, the customer visited our facility for production inspection and quality verification. All tubes were manufactured in accordance with ASTM B111 requirements and delivered with complete Material Test Certificates (MTC), ensuring full heat number traceability and verified chemical and mechanical properties.
Aluminium Brass Seamless Tubes Size Chart
| Wall Thickness in MM | WT / Metre | Metric in MM | Wall Thickness | Imperial OD | Nominal Bore mm |
|---|---|---|---|---|---|
| 1.63 | 0.206 | 6.35 | 16G | 1/4″ | 3.09 |
| 0.71 | 0.077 | 4.76 | 22G | 3/16″ | 3.34 |
| 1.22 | 0.167 | 6.35 | 18G | 1/4″ | 3.91 |
| 0.91 | 0.172 | 7.94 | 20G | 5/16″ | 6.11 |
| 0.91 | 0.133 | 6.35 | 20G | 1/4″ | 4.53 |
| 1.63 | 0.345 | 9.52 | 16G | 3/8″ | 6.26 |
| 0.91 | 0.210 | 9.52 | 20G | 3/8″ | 7.70 |
| 1.22 | 0.271 | 9.52 | 18G | 3/8″ | 7.08 |
| 1.63 | 0.484 | 12.7 | 16G | 1/2″ | 9.44 |
| 0.91 | 0.288 | 12.7 | 20G | 1/2″ | 10.88 |
| 1.22 | 0.375 | 12.7 | 18G | 1/2″ | 10.26 |
| 0.91 | 0.550 | 14.29 | 20G | 9/16″ | 12.47 |
| 1.22 | 0.479 | 15.88 | 18G | 5/8″ | 13.44 |
| 1.63 | 0.622 | 15.88 | 16G | 5/8″ | 12.62 |
| 0.91 | 0.365 | 15.88 | 20G | 5/8″ | 14.06 |
| 1.63 | 0.761 | 19.05 | 16G | 3/4″ | 15.79 |
| 3.25 | 1.376 | 19.05 | 10G | 3/4″ | 12.55 |
| 1.22 | 0.583 | 19.05 | 18G | 3/4″ | 16.61 |
| 1.63 | 0.899 | 22.22 | 16G | 7/8″ | 18.96 |
| 0.91 | 0.442 | 19.05 | 20G | 3/4″ | 17.23 |
| 1.22 | 0.687 | 22.22 | 18G | 7/8″ | 19.78 |
| 1.63 | 1.038 | 25.4 | 16G | 1″ | 22.14 |
| 1.22 | 0.791 | 25.4 | 18G | 1″ | 22.96 |
| 1.63 | 1.177 | 28.58 | 16G | 1-1/8″ | 25.32 |
| 0.91 | 0.597 | 25.4 | 20G | 1″ | 23.00 |
| 1.63 | 1.316 | 31.75 | 16G | 1-1/4″ | 28.49 |
| 1.22 | 0.998 | 31.75 | 18G | 1-1/4″ | 29.31 |
| 1.63 | 1.454 | 34.92 | 16G | 1-3/8″ | 31.66 |
| 1.63 | 1.593 | 38.1 | 16G | 1-1/2″ | 34.84 |
| 3.25 | 3.040 | 38.1 | 10G | 1-1/2″ | 31.60 |
| 1.22 | 1.206 | 38.1 | 18G | 1-1/2″ | 35.66 |
| 1.22 | 1.410 | 44.45 | 18G | 1-3/4″ | 42.01 |
| 3.25 | 3.600 | 44.45 | 10G | 1-3/4″ | 37.95 |
| 3.25 | 4.140 | 50.8 | 10G | 2″ | 44.30 |
| 1.22 | 1.621 | 50.8 | 18G | 2″ | 48.36 |
| 3.25 | 4.700 | 57.2 | 10G | 2-1/4″ | 50.70 |
| 1.63 | 2.418 | 50.8 | 16G | 2″ | 47.54 |
| 3.25 | 5.248 | 63.5 | 10G | 2-1/2″ | 57.00 |
| 3.25 | 5.810 | 69.85 | 10G | 2-3/4″ | 63.35 |
| 1.63 | 2.703 | 63.5 | 16G | 2-1/2″ | 60.24 |
| 3.25 | 6.354 | 76.2 | 10G | 3″ | 69.70 |
| 3.25 | 7.460 | 88.90 | 10G | 3-1/2″ | 82.40 |
| 3.25 | 6.910 | 82.55 | 10G | 3-1/4″ | 76.05 |
| 3.25 | 8.020 | 95.25 | 10G | 3-3/4″ | 88.75 |
| 3.25 | 11.800 | 133.5 | 10G | 5″ID | 127.00 |
| 3.25 | 9.670 | 107.95 | 10G | 4-1/4″ | 101.45 |
| 3.25 | 13.900 | 158.9 | 10G | 6″ID | 152.40 |
ASTM B 111 C 68700 Tubing Mechanical Properties
| Standard | ASTM B 111 | IS 1545 | BS 2871 PART3 | NFA 51 102 | DIN 1785 | JIS H3300 |
|---|---|---|---|---|---|---|
| Symbol | C 68700 | CuZn21AI2As | CZ 110 | CuZn22AI2 | CuZn20AI2 | C 6870 |
| Al | 1.8-2.5 | 1.8-2.3 | 1.8-2.3 | 1.8-2.5 | 1.8-2.3 | 1.8-2.5 |
| Cu | 76.0-79.0 | 76.0-78.0 | 76.0-78.0 | 76.0-79.0 | 76.0-79.0 | 76.0-79.0 |
| Pb | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| As | 0.02-0.06 | 0.02-0.06 | 0.02-0.06 | 0.02-0.06 | 0.02-0.35 | 0.02-0.06 |
| Fe | 0.06 | 0.06 | 0.06 | 0.06 | 0.07 | 0.06 |
| Ni | – | – | – | – | 0.1 | – |
| Zn | REM'DER | REM'DER | REM'DER | REM'DER | REM'DER | REM'DER |
| P | – | – | – | – | 0.01 | – |
| Total Impurities Max. | – | |||||
| – | 0.3 | 0.03 | 0.3 | 0.1 | – | |
| Yield Strength n/mm2 | 125 | 400Mpa Max. | – | – | 1 50-230 | – |
| 105 | 355Mpa Min. | – | – | 120-180 | – | |
| – | 415Map | – | – | – | – | |
| Condition | 61 | O | M | – | F39 | O |
| – | TA | TA | – | F34 | – | |
| – | D | O | – | – | – | |
| Hardness HV5 – | – | – | 150Min | 80-130 | – | – |
| – | – | 85-110 | – | – | – | |
| – | – | 75Max. | – | – | – | |
| Elng'Tion Percent (%) | – | 85Max. | – | – | 45Min. | 40Min. |
| – | 80-110 | – | – | 55Min. | – | |
| – | 130Min. | – | – | – | – | |
| Tensile n/mm2 Minimum | 345 | – | – | – | 390 | 373 |
| – | – | – | – | 340 | – | |
| Grain Size mm (75X) | 0.010-0.045 | 0.010-0.045 | 0.05Max. | 0.010-0.045 | – | 0.010-0.045 |
| standard | Designation | Temper | Tensile test | Hardness test | |||||
|---|---|---|---|---|---|---|---|---|---|
| Thickness (mm) | Outside diameter(mm) | Elongation in 2in., min% | Tensile strength min ksi | Yield strength min ksi | Rockwell hardness | ||||
| HR15T | HR30T | ||||||||
| JIS | C6871T-O | O61 | 0.8-0.10 | 50-250 | 40Min. | 36Min. | 13Min. | – | – |
| C6872T-O, C687TS-O | 0.8-0.10 | 50-250 | 40Min. | 36Min. | 13Min. | – | – | ||
| ASTM | C68700 | O61 | 0.8-0.10 | 5-50 | – | 50 | 18 | – | – |
How To Test Astm B111 C68700 Tubes
Ensuring the quality and reliability of ASTM B111 C68700 Tubes is crucial. Here are some common testing methods:
Hydrostatic testing: Checks for leaks and verifies the tube's ability to withstand pressure.
Ultrasonic testing: Detects internal flaws or defects that could compromise performance.
Eddy Current testing: Evaluates the tube's surface and subsurface integrity.
Mechanical testing: Measures tensile strength, hardness, and elongation to ensure compliance with ASTM standards.
Typical Application Scenarios
Thanks to its comprehensive performance, the C68700 is widely used in the following fields:
1. Marine Engineering: Ship parts, seawater piping systems, condenser tubes, etc., with outstanding resistance to seawater corrosion.
2. Energy and Chemical Industry: Heat exchangers, valve assemblies, pump housings, etc., suitable for weak acid and weak alkali environments.
3. Power Electronics: Conductive terminals, heat dissipation components, balancing conductivity requirements and structural strength.
4. Architectural Decoration: Weather-resistant curtain wall supports, hardware, combining aesthetics and durability.
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about us
Our Product Portfolio
We supply an extensive inventory of copper products in various forms, grades, and tempers to meet your exact specifications.
1. Copper & Copper Alloy Tubes/Pipes
Type: Copper Seamless Tube, Copper Welded Tube, Capillary Tube, Refrigeration Tube, Heat Exchanger Tube, Condenser Tube, Dehydrated Tube.
Key Alloys: C10200 (OFHC Copper), C11000 (ETP Copper), C12200 (DHP Copper), C44300, C68700, C70600 (Copper Nickel 90/10), C71500 (Copper Nickel 70/30).
2. Copper & Copper Alloy Sheets/Plates
Type: Copper Sheet, Copper Plate, Copper Foil, Copper Thin Sheet, Copper Thick Plate, Embossed Sheet, Perforated Sheet.
Key Alloys: C10200, C11000, C17200 (Beryllium Copper), C26000 (Cartridge Brass), C26800, C28000 (Muntz Metal).
3. Copper & Copper Alloy Bars/Rods
Type: Copper Round Bar, Copper Square Bar, Copper Hexagonal Bar, Copper Flat Bar, Copper Wire Rod.
Key Alloys: C10100, C11000, C36000 (Free-Cutting Brass), C38500 (Architectural Bronze).
4. Copper & Copper Alloy Strips/Wires
Type: Copper Strip, Copper Coil, Copper Flat Wire, Copper Bare Wire, Copper Braided Wire, Copper Tin-Plated Wire.
Key Alloys: C11000, C26000 (Brass Strip), C51900 (Phosphor Bronze), C52100, C70400.
Quality & Standards
We guarantee that all our products comply with international and national standards, ensuring performance, reliability, and safety.
International Standards: ASTM, EN, DIN, JIS, ISO.
Common Standards: ASTM B111,ASTM B68, B75, B88, B96, B152, B187, B465.
Why Choose Us?
One-Stop Shop: A comprehensive range of copper products simplifies your sourcing.
Quality Assured: Rigorous inspection and material traceability.
Global Logistics: Efficient and reliable shipping to destinations worldwide.
Technical Support: Expert assistance with material selection and specification.
