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ASTM B111 Copper Alloy Seamless Tube is the internationally recognized standard for seamless copper and copper-alloy condenser tubes used in surface condensers, evaporators, heat exchangers, desalination plants, marine cooling systems, and power generation facilities. ASTM B111 covers multiple copper alloy grades including C44300 Admiralty Brass, C68700 Aluminum Brass, C70600 90/10 Copper Nickel, and C71500 70/30 Copper Nickel. These alloys are specifically developed to provide excellent thermal conductivity, seawater corrosion resistance, erosion resistance, and long service life in demanding heat-transfer environments.
Compared with conventional stainless steel heat exchanger tubes, ASTM B111 copper alloy tubes offer superior heat transfer efficiency, reduced fouling, lower maintenance costs, and proven reliability in marine and industrial cooling systems. Copper-nickel grades such as C70600 and C71500 are particularly valued for seawater service due to their excellent resistance to biofouling and chloride attack.
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ASTM B111 Alloy Grade Comparison
| Grade | Material Type | Main Advantage | Typical Applications |
|---|---|---|---|
| C44300 | Admiralty Brass | Good corrosion resistance & economical | Condensers |
| C68700 | Aluminum Brass | Excellent erosion resistance | Seawater condensers |
| C70600 | 90/10 Cu-Ni | Outstanding seawater corrosion resistance | Marine heat exchangers |
| C71500 | 70/30 Cu-Ni | Highest strength and erosion resistance | Offshore & desalination |
Chemical Composition (Typical %)
| Element | C44300 | C68700 | C70600 | C71500 |
|---|---|---|---|---|
| Cu | 70-73 | Balance | 88.6-90.6 | 69-71 |
| Zn | Balance | 20-24 | ≤1.0 | ≤1.0 |
| Ni | - | - | 9-11 | 29-33 |
| Fe | ≤0.06 | ≤0.06 | 1.0-1.8 | 0.4-1.0 |
| Mn | - | - | ≤1.0 | ≤1.0 |
| Al | - | 1.8-2.5 | - | - |
| Sn | 0.9-1.2 | - | - | - |
| As | 0.02-0.08 | 0.02-0.06 | - | - |
Mechanical Properties (Typical)
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| C44300 | ≥310 | ≥105 | ≥30 |
| C68700 | ≥350 | ≥125 | ≥30 |
| C70600 | ≥275 | ≥105 | ≥30 |
| C71500 | ≥360 | ≥125 | ≥30 |
Physical Properties
| Property | C70600 | C71500 |
|---|---|---|
| Density | 8.94 g/cm³ | 8.95 g/cm³ |
| Thermal Conductivity | 50 W/m·K | 29 W/m·K |
| Electrical Conductivity | 7% IACS | 4% IACS |
| Melting Range | 1090-1145°C | 1170-1240°C |
Standard Dimensions (ASTM B111 Copper Alloy Seamless Tube)
| Outside Diameter (in.) | Outside Diameter (mm) | Wall Thickness (in.) | Wall Thickness (mm) | Typical Length (m) | Remarks |
|---|---|---|---|---|---|
| 1/4 | 6.35 | 0.028 | 0.71 | 3.0 – 6.0 | Light Gauge |
| 3/8 | 9.52 | 0.035 | 0.89 | 3.0 – 6.0 | - |
| 1/2 | 12.70 | 0.049 | 1.24 | 3.0 – 6.0 | Common for heat exchangers |
| 5/8 | 15.88 | 0.049 | 1.24 | 3.0 – 6.0 | - |
| 3/4 | 19.05 | 0.065 | 1.65 | 3.0 – 6.0 | - |
| 1 | 25.40 | 0.083 | 2.11 | 3.0 – 6.0 | - |
| 1-1/4 | 31.75 | 0.095 | 2.41 | 3.0 – 6.0 | - |
| 1-1/2 | 38.10 | 0.109 | 2.77 | 3.0 – 6.0 | - |
| 2 | 50.80 | 0.120 | 3.05 | 3.0 – 6.0 | - |
| 2-1/2 | 63.50 | 0.134 | 3.40 | 3.0 – 6.0 | - |
| 3 | 76.20 | 0.156 | 3.96 | 3.0 – 6.0 | Heavy Wall |
| 4 | 101.60 | 0.188 | 4.78 | 3.0 – 6.0 | Heavy Wall |
| 5 | 127.00 | 0.203 | 5.16 | 3.0 – 6.0 | - |
| 6 | 152.40 | 0.220 | 5.59 | 3.0 – 6.0 | - |
| 8 | 203.20 | 0.250 | 6.35 | 3.0 – 6.0 | - |
Dimensional Tolerances (ASTM B111 Reference)
| Parameter | Tolerance |
|---|---|
| Outside Diameter | ±0.003 in. (±0.08 mm) |
| Wall Thickness | ±10% |
| Length | ±3 mm per meter |
| Straightness | ≤ 1.5 mm per meter |
Available Tempers
| Designation | Condition | Application |
|---|---|---|
| O61 | Annealed | For bending and flaring |
| H55 | Light Drawn | For moderate strength and good ductility |
| H58 | Hard Drawn | For maximum strength applications |
| Stress Relieved | Special | For pressure and thermal cycling service |
Surface Finish & Ends
Mill Finish or Bright Annealed
Plain Ends / Deburred Ends
Cleaned, Capped, and Dry Packed
Optional Polished or Pickled Surface
Applications
Marine piping and seawater systems
Heat exchangers and condensers
Desalination plants
Offshore oil & gas platforms
Power generation systems
Shipbuilding and engine cooling circuits
Corrosion Resistance Analysis
C44300 Admiralty Brass
Suitable for fresh water and mildly polluted cooling water systems. Tin and arsenic additions improve resistance to dezincification.
C68700 Aluminum Brass
Designed for high-velocity seawater environments. Aluminum creates a protective oxide film that significantly improves erosion-corrosion resistance.
C70600 Copper Nickel
Excellent resistance to seawater corrosion, marine biofouling, chloride attack, and stress corrosion cracking. Widely used in shipbuilding and offshore platforms.
C71500 Copper Nickel
Provides superior strength and erosion resistance compared with C70600, making it ideal for aggressive seawater systems and high-flow conditions.
Heat Transfer Performance
One of the primary reasons engineers select ASTM B111 copper alloy tubes is their excellent thermal conductivity.
Benefits include:
Faster heat exchange efficiency
Reduced energy consumption
Improved condenser performance
Lower maintenance costs
Longer operational lifespan
These characteristics make ASTM B111 tubes the preferred solution for power plants, desalination facilities, and industrial cooling systems.
ASTM B111 vs Stainless Steel Heat Exchanger Tubes
| Property | ASTM B111 Copper Alloy Tube | Stainless Steel Tube |
|---|---|---|
| Thermal Conductivity | Excellent | Moderate |
| Seawater Resistance | Excellent (CuNi Grades) | Good |
| Biofouling Resistance | Excellent | Moderate |
| Heat Transfer Efficiency | Higher | Lower |
| Maintenance Cost | Lower | Higher |
| Service Life in Seawater | Excellent | Good |
| Initial Material Cost | Medium | Medium-High |
Engineering Recommendation
C70600 90/10 Copper Nickel is generally preferred for most seawater cooling systems.
C71500 70/30 Copper Nickel is recommended for:
High-velocity seawater
Offshore platforms
Naval vessels
Desalination plants
Aggressive marine environments
Copper-nickel alloys offer superior resistance to seawater corrosion, biofouling, and impingement attack, making them a preferred choice for marine condensers and desalination systems.
ASTM B111 Manufacturing Process
At Xi'an Dongmeng Group Co., Ltd, ASTM B111 seamless tubes are produced through a controlled manufacturing process:
Step 1 – Raw Material Melting
High-purity copper and alloying elements are melted according to ASTM chemical requirements.
Step 2 – Extrusion
Billets are hot-extruded into hollow tubes.
Step 3 – Cold Drawing
Precision cold drawing ensures dimensional accuracy and smooth surface finish.
Step 4 – Annealing
Controlled heat treatment improves ductility and stress relief.
Step 5 – Straightening
Advanced straightening equipment guarantees excellent tube straightness.
Step 6 – Non-Destructive Testing
100% Eddy Current Inspection
Hydrostatic Testing
PMI Verification
Dimensional Inspection
ASTM B111 requires a variety of examinations including eddy-current testing, expansion testing, flattening testing, hydrostatic or pneumatic testing, and residual stress evaluation.
Recommended Seawater Flow Velocity
One of the most important factors affecting condenser tube life is cooling water velocity.
| Alloy Grade | Recommended Velocity |
|---|---|
| C44300 Admiralty Brass | Up to 1.8 m/s |
| C68700 Aluminum Brass | Up to 2.4 m/s |
| C70600 90/10 Cu-Ni | Up to 3.5 m/s |
| C71500 70/30 Cu-Ni | Up to 4.5 m/s |
Why Velocity Matters
Excessive water velocity may cause:
Impingement attack
Erosion corrosion
Premature tube failure
Copper nickel grades exhibit significantly higher resistance to erosion and high-velocity seawater compared with traditional brass alloys.
ASTM B111 Available Tempers
| Temper Designation | Description |
|---|---|
| O60 | Soft Annealed |
| O61 | Annealed |
| H55 | Light Drawn |
| H80 | Hard Drawn |
| H58 | Extra Hard |
Different tempers provide varying combinations of:
Strength
Ductility
Formability
Pressure Resistance
ASTM B111 specifies annealed, light-drawn, hard-drawn and hard-drawn/end-annealed conditions depending on service requirements.
ASTM B111 International Material Equivalents
| ASTM Grade | UNS | EN | DIN | Common Name |
|---|---|---|---|---|
| C44300 | C44300 | CW706R | CuZn28Sn1As | Admiralty Brass |
| C68700 | C68700 | CW702R | CuZn22Al2As | Aluminum Brass |
| C70600 | C70600 | CW352H | CuNi10Fe1Mn | 90/10 CuNi |
| C71500 | C71500 | CW354H | CuNi30Mn1Fe | 70/30 CuNi |
This equivalency table helps EPC contractors, engineering companies, and global procurement teams quickly identify compatible international specifications.
Packing & Delivery
Plastic caps on both ends
Bundled and wrapped in waterproof material
Wooden cases for export shipping
Marked with: ASTM B111 – Alloy – Size – Heat No. – Manufacturer
Manufacturing Capability
Xi'an Dongmeng Group Co., Ltd supplies:
Seamless Copper Alloy Tubes
Condenser Tubes
Heat Exchanger Tubes
U-Bend Tubes
Copper Nickel Tubes
Admiralty Brass Tubes
Aluminum Brass Tubes
Available Services:
Tube Bending
U-Bend Manufacturing
Custom Length Cutting
CNC Processing
Tube Expansion
OEM Packaging
Inspection & Quality Assurance
Every ASTM B111 tube undergoes:
✔ Chemical Composition Analysis
✔ Mechanical Property Testing
✔ Eddy Current Testing
✔ Hydrostatic Testing
✔ Dimensional Inspection
✔ Flattening Test
✔ Expansion Test
✔ PMI Verification
✔ Third-Party Inspection (SGS / BV / TUV)
ASTM B111 requires expansion, flattening, residual stress, eddy-current and pressure-related testing to ensure tube integrity for condenser and heat exchanger service.
FAQ
What is ASTM B111 used for?
ASTM B111 is primarily used for seamless condenser tubes, evaporator tubes, and heat exchanger tubes in marine, power generation, and industrial cooling applications.
Which ASTM B111 alloy is best for seawater?
C71500 provides the highest seawater erosion resistance, while C70600 offers the best balance between cost and performance.
What is the difference between C70600 and C71500?
C70600 contains approximately 10% nickel, whereas C71500 contains approximately 30% nickel, resulting in higher strength and better resistance to aggressive seawater environments.
Is ASTM B111 seamless or welded?
ASTM B111 primarily covers seamless condenser and heat exchanger tubes.
Can ASTM B111 tubes be supplied as U-bend tubes?
Yes. U-bend fabrication is commonly available for condenser and heat exchanger projects.
Are EN 10204 3.1 certificates available?
Yes, all export orders can be supplied with EN 10204 3.1 MTC.
Is third-party inspection available?
Yes. SGS, BV, TUV, DNV, and customer-designated inspection agencies are supported.
Can customized dimensions be produced?
Yes. Customized OD, wall thickness, length, and tube bending services are available.
Which ASTM B111 grade is best for seawater condensers?
For most seawater condensers, C70600 90/10 Copper Nickel provides the best balance between corrosion resistance, heat transfer efficiency, and cost. For aggressive seawater environments, C71500 70/30 Copper Nickel is preferred.
Is ASTM B111 suitable for desalination plants?
Yes. C68700 Aluminum Brass, C70600, and C71500 are widely used in desalination evaporators, condensers, and brine heaters due to their excellent seawater resistance.
Can ASTM B111 tubes be supplied with U-bends?
Yes. Straight tubes, U-bend tubes, and custom-fabricated heat exchanger tubes can be supplied according to customer drawings and project specifications.
What inspection tests are required under ASTM B111?
Typical tests include:
Eddy Current Testing
Hydrostatic Testing
Expansion Test
Flattening Test
Residual Stress Test
Chemical Analysis
Mechanical Property Testing
These examinations are part of ASTM B111 quality verification requirements.
Why Choose Xi'an Dongmeng Group Co., Ltd
20+ Years Manufacturing Experience
ASTM / ASME / EN Standards Compliance
Complete Copper Alloy Product Range
OEM & ODM Manufacturing
Third-Party Inspection Available
Fast Production & Delivery
Global Export Experience
Technical Engineering Support
Competitive Factory Pricing
Custom Packaging Solutions
Looking for a reliable supplier of ASTM B111 Copper Alloy Seamless Tube?
Our technical sales team is ready to assist you with material selection, quotation, and custom fabrication based on your project needs.
Contact us today for a fast quotation and professional material support for your copper-nickel tube requirements.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
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