Trusted Exporter of ASTM B75 Copper 90/10 Seamless Tubes, ASTM B68 Copper Bright Annealed Tubes, ASTM B251 Copper Tubing, C12200 Copper Seamless Polished tubes, Copper C10200 Tubing, OFHC Copper Tubes, Phosphorus Deoxidized Copper Tubes, Copper condenser tubes, CuNi heat exchanger tubes, Copper round tubes, Copper Nickel 70/30 drawn tubes, Cupro nickel precision tubes get the best pricing today. Bulk orders welcome.
At New Eagle Industrial Corporation, we supply a comprehensive range of Copper Seamless Tubes manufactured as per ASTM B68, ASTM B75, and ASTM B251 standards. Our tubes are engineered for superior thermal conductivity, corrosion resistance, dimensional stability, and long service life.
ASTM B68 covers cold-drawn seamless copper tubes designed for water lines, fuel/oil lines, plumbing, and general engineering. Cold drawing ensures smooth internal surfaces, tight tolerances, and high pressure resistance. Available in C12200 and C10200, these tubes offer strong corrosion resistance, weldability, and excellent thermal conductivity.
ASTM B75 defines seamless copper tubes produced from high-conductivity alloys like C12200 and C10200, primarily used in heat exchangers, condensers, HVAC units, and industrial cooling systems. Precision drawing and annealing improve ductility, surface finish, and uniform wall thickness, making them ideal for bending and forming operations.
ASTM B251 specifies general-purpose seamless copper and copper-alloy tubes supplied in multiple tempers and hardness levels. These tubes are widely used in marine hardware, electrical systems, industrial piping, and structural components due to their high strength, consistent mechanical properties, and excellent resistance to seawater and industrial chemicals.
With competitive pricing, ready stock, and global export capabilities, New Eagle Steel remains a trusted source for high-quality copper seamless tubes.
90/10 Copper Seamless Tubes – Technical Specifications
ASTM B75 / B68 Copper Seamless Tubing – Chemical Composition
ASTM B75, B68, and B251 copper seamless tubes are produced using high-purity copper grades such as C12200 (DHP) and C10200 (OFHC), ensuring excellent conductivity, corrosion resistance, and fabrication properties. The chemical composition is tightly controlled to maintain mechanical strength, uniform grain structure, and long-term performance in heat-transfer, HVAC, plumbing, and industrial systems.
| Grade | Copper (Cu) | Phosphorus (P) | Oxygen (O) | Nickel (Ni) | Iron (Fe) | Others |
|---|---|---|---|---|---|---|
| C12200 (DHP Copper) | 99.9% min (approx.) | 0.015–0.040% | — | — | — | Residual elements ≤ 0.03% |
| C10200 (OFHC Copper) | 99.95% min | — | 0.001–0.003% | — | — | Total impurities ≤ 0.03% |
| Other Copper Grades (ASTM B251) | 99.0% min | Varies by alloy | Varies | May include ≤ 30% Ni in Cu-Ni alloys | Varies | Composition based on specific alloy type |
ASTM B251 Copper Nickel Tubes – Mechanical Properties
ASTM B68, B75, and B251 copper seamless tubes offer high ductility, strong thermal conductivity, and stable mechanical properties, making them suitable for heat exchangers, HVAC coils, plumbing, refrigeration, and industrial fluid-transfer systems. Mechanical properties vary with temper, with annealed tubes providing maximum formability.| Property | C12200 (DHP Copper) | C10200 (OFHC Copper) | Notes |
|---|---|---|---|
| Tensile Strength | 205 – 275 MPa | 220 – 270 MPa | Depends on temper & tube size |
| Yield Strength (0.5% Ext.) | 69 – 110 MPa | 70 – 110 MPa | Annealed to light-drawn tempers |
| Elongation (%) | 30 – 40% | 30 – 45% | Higher ductility in annealed condition |
| Hardness (Rockwell F) | 55 – 75 HRF | 55 – 75 HRF | Annealed; harder tempers available |
| Modulus of Elasticity | 117 GPa | 117 GPa | Same for most copper grades |
| Thermal Conductivity | ~ 320 W/m·K | ~ 390 W/m·K | OFHC copper has highest conductivity |
| Density | 8.94 g/cm³ | 8.94 g/cm³ | Standard for pure copper grades |
C12200 / C10200 Copper Seamless Tubes – Equivalent Grades
C12200 (DHP) and C10200 (OFHC) copper grades used in ASTM B68, B75, and B251 seamless tubes have direct equivalents across EN, DIN, JIS, BS, and ISO standards, ensuring global compatibility. These grades are widely recognized for their high conductivity, corrosion resistance, and excellent formability.
| Standard | C12200 (DHP Copper) | C10200 (OFHC Copper) |
|---|---|---|
| ASTM | ASTM B68 / B75 / B251 | ASTM B68 / B75 / B251 |
| UNS | C12200 | C10200 |
| ISO | Cu-DHP | Cu-OF |
| EN / DIN | CW024A | CW008A |
| BS (British Standard) | C106 | C101 |
| JIS (Japan) | C1220 | C1020 |
| AFNOR (France) | CuDHP | Cu-OF |
| GB (China) | T2 / TP2 | TU0 / TU1 |
| Other Common Names | DHP Copper, Deoxidized High-Phosphorus Copper | OFHC Copper, Oxygen-Free High Conductivity Copper |
What are the key differences between ASTM B68, B75, and B251 copper seamless tubes?
- ASTM B68:
- Covers cold-drawn seamless copper tubes.
- Primarily used for water supply lines, fuel & oil lines, plumbing, and general engineering applications.
- Manufactured in C12200 (DHP) and C10200 (OFHC) copper grades.
- Emphasizes tight tolerances, smooth internal surfaces, and high pressure-handling capability.
- ASTM B75:
- Specifies seamless copper tubes made from high-conductivity alloys like C12200 and C10200.
- Focused on heat exchanger, condenser, evaporator, HVAC, and industrial cooling applications.
- Tubes are annealed and precision drawn, offering superior ductility, uniform wall thickness, and enhanced surface finish.
- ASTM B251:
- Covers general-purpose copper and copper-alloy seamless tubes, including various tempers and hardness levels.
- Suitable for marine hardware, architectural components, electrical systems, industrial piping, and mechanical structures.
- Emphasizes controlled mechanical properties, high tensile strength, and resistance to seawater or chemical corrosion.
Summary: ASTM B68 is for standard water/fuel applications, B75 for heat transfer systems, and B251 for structural, industrial, and marine applications.
What are the common copper grades used in ASTM B68 / B75 / B251 tubes and their significance?
- C12200 (DHP Copper – Deoxidized High Phosphorus):
- Contains phosphorus (0.015–0.04%) to improve corrosion resistance, especially in water systems.
- Excellent mechanical properties, suitable for bending and flaring operations.
- Widely used in plumbing, HVAC, and heat exchanger tubing.
- C10200 (OFHC Copper – Oxygen-Free High Conductivity):
- >99.95% purity, oxygen content ≤ 0.001–0.003%.
- Provides maximum thermal and electrical conductivity, suitable for electrical, high-conductivity, and high-performance applications.
- Resistant to hydrogen embrittlement and welding-related defects.
- Other Copper-Alloys (B251):
- May include Cu-Ni or alloyed copper for seawater and marine applications.
- Designed to enhance mechanical strength and corrosion resistance for industrial and offshore systems.
Significance: Selection of grade affects thermal conductivity, corrosion resistance, ductility, and pressure capacity in specific applications.
How are Copper Seamless Tubes manufactured and what processes ensure quality?
- Hot Extrusion or Hot Piercing:
- The initial tube is formed from solid copper billets using high-temperature extrusion or piercing, producing a seamless hollow tube.
- Cold Drawing:
- Tubes are drawn through dies to achieve the desired diameter, wall thickness, and surface finish.
- Cold drawing enhances mechanical strength and dimensional accuracy.
- Annealing (Bright Annealed):
- Tubes are annealed in controlled atmospheres, reducing internal stresses, increasing ductility, and producing smooth bright surfaces.
- Straightening & Finishing:
- Tubes are straightened, cut to length, and undergo non-destructive testing (eddy current, hydrostatic, or visual inspection) to ensure quality.
- Testing & Certification:
- Mechanical tests: tensile strength, yield, elongation
- Dimensional tests: outer diameter, wall thickness, ovality
- Chemical tests: confirming alloy composition per ASTM standards
- Surface tests: smoothness, absence of scale, pitting, or defects
Global Export Network for Cupro Nickel Seamless Tubing
As a trusted manufacturer and exporter, New Eagle Steel supplies Copper Seamless Tubes globally. Our high-performance products are widely used in chemical processing, pollution control, marine, and pharmaceutical industries across Europe, the Middle East, Asia, and the Americas, ensuring exceptional corrosion resistance, reliability, and precision engineering.
- Middle East: United Arab Emirates (UAE), Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Yemen, Iran, Iraq, Israel, Jordan, Lebanon, Syria, Turkey
- North Africa: Egypt, Algeria, Morocco, Tunisia, Libya
- Asia Pacific: Singapore, Malaysia, Vietnam, Indonesia, Thailand, Philippines, Cambodia, Laos, Myanmar, Brunei, Timor-Leste, Taiwan, Japan, South Korea
- Europe: Spain, Belgium, Netherlands, France, Germany, Italy, United Kingdom (England), Poland, Cyprus, Malta, Russia
- Americas: Brazil, Mexico, Chile, Peru, Colombia, Argentina, United States (USA), Canada
- India: Chennai, Coimbatore, Bangalore, Thiruvananthapuram, Pune, Kolkata, Kerala, Karnataka, Gujarat, Mumbai, Delhi
Seamless Copper Tubing for Industrial & Engineering Applications
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Power Generation (Thermal, Nuclear & Renewable)
Marine & Offshore Engineering
Pharmaceuticals & Biotechnology
Food, Beverage & Dairy Processing
Pulp & Paper Industry
Aerospace & Defense
Automotive & Transportation
Instrumentation & Control Systems
Water Treatment & Desalination
HVAC & Heat Exchanger Systems
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