Oxygen Free Copper Pipe

The material of Oxygen free copper pipe is pure copper that does not contain oxygen or any residual deoxidizers. But it still contains very trace amounts of oxygen and some impurities. According to the standard, the oxygen content shall not exceed 0.003%, the total impurity content shall not exceed 0.05%, and the purity of copper shall be greater than 99.95%.

 

Oxygen free copper has no Hydrogen embrittlement, high conductivity, good processing and welding performance, corrosion resistance, and low temperature performance. Then the Oxygen free copper pipe widely used in the production of conductive and thermal conductive equipment accordingly.

 

 

When sourcing OFC pipe, it is important to reference the correct manufacturing standards to ensure quality and performance.

ASTM/ASME: ASTM B75 (Seamless Copper Tube), ASTM B68 (Seamless Bright Annealed), ASME SB75.

European (EN): Cu-OF (EN 1652 / 12449).

German (DIN): DIN 1708 (Designation: 2.0040).

Chinese (GB): GB/T 1527, GB/T 17791, GB/T 18033.

 

 

Grade	Type	Temper	Size(mm)
			OD	Thickness	Length
TU1	Extrusion	R	60-300	5-65	300-6000
TU1	Drawn	M,M2	5-330	0.5-15	500-7000
		Y,T	38-330	15-17.5
		Y2	5-100	0.5-10
TU1	Copper pipes for air conditioning and refrigeration equipment	Y,M,Y2	6-25	0.3-1.5	80-120kg in coil
					500-9000
TU2	Extrusion	R	60-300	5-65	300-6000
TU2	Drawn	M,M2	5-330	0.5-15	500-7000
		Y,T	38-330	15-17.5
		Y2	5-100	0.5-10
TU2	Copper pipes for air conditioning and refrigeration equipment	Y,M,Y2	6-25	0.3-1.5	80-120kg in coil
					500-9000
TU2	Copper water pipes and copper gas pipes	Y	6-325	0.6-0.8	≤6000
		Y2	6-159
		M	6-108
		M	≤28	0.6-0.8	≥15000 in coil

 

 

Oxygen Free Copper (OFC) refers to high-purity copper materials with extremely low oxygen content. According to the national standard GB/T 5231, it is mainly divided into two grades: TU1 (99.99% purity) and TU2 (99.95% purity). Their core differences lie in oxygen content, conductivity, and mechanical properties, making them suitable for high-end applications in different scenarios

Parameters	TU1 oxygen free copper	TU2 oxygen free copper	Ordinary copper (T2)
Copper purity	≥ 99.99%	≥ 99.95%	≥ 99.90%
Oxygen content	≤ 0.001%	≤ 0.002%	0.02%-0.05%
Conductivity (IACS)	≥ 101%	≥ 100%	97%-98%
Tensile strength (MPa)	210-250	200-230	190-220
Elongation rate (%)	≥ 35	≥ 30	≥ 25

 

 

• Select the scene for TU1

The signal integrity requirements are extremely high (such as high-frequency communication, chips)
Extreme environmental use (aerospace, marine equipment)
Ultra high-end products with sufficient budget

• Select the scene for TU2

Cost sensitive mass production (such as high-volume models)
High current but non extreme performance requirements (household charging station)
Multi core cables with high processing complexity Author: Shanghai Hankai Metal Materials

 

OFC pipes are typically produced using a specialized process to prevent contamination and ensure high purity:

• Melting: High-purity electrolytic copper cathodes are melted in a controlled, oxygen-free atmosphere (often using a reducing gas or vacuum).
• Casting: The molten copper is cast into a solid billet or hollow shell.
• Extrusion: The billet is heated and forced through a die to form a seamless tube. Large-diameter OFC pipes (up to 508 mm) can be produced using powerful extruders.
• Rolling & Drawing: The tube is then reduced to its final diameter and wall thickness through a series of cold rolling and drawing processes.
• Annealing: The tube is heat-treated in a protective atmosphere (like hydrogen or nitrogen) to achieve the desired soft temper and relieve internal stresses.

 

 

 

 

Because of its high purity, conductivity, and resistance to hydrogen embrittlement, OFC pipe is critical in several high-tech industries:

Electronics & Semiconductor: Used for cooling lines in sputtering targets, waveguides, and components in MRI machines where high signal fidelity is required.

Vacuum Systems: Employed in vacuum capacitors, X-ray tubes, and particle accelerators because it has low volatility and does not outgas under high vacuum.

Power Transmission: Used as hollow conductors and bus pipes in power generation and distribution systems for efficient cooling and high current-carrying capacity.

Cryogenics & Scientific Research: Essential for constructing cryogenic systems and components that operate at very low temperatures due to its high thermal conductivity at cryogenic temperatures.

Medical Equipment: Found in advanced medical devices like electrosurgical tools and diagnostic imaging equipment

 

 

Q: Can i get samples?

A:We can provide sample as our inventory or production status

 

Q: How does the payment process work?

A:Generally we advise 30%TT deposit, balance be paid before shipment.

 

Q:What information should i confirm you when i send inquiry

A:Sometimes we need product specification like material standard or Grade, size, Qty, shipping port, Terms like FOB or CIF etc.

 

Q: How long of the delivery time?

A: Usually, the shipment can be delivery within 15-30days after the order confirmed.

 

Q: Which country have you exported to?

A: Our main market is South America, Middle East, Africa and Europe. And have built long time relationship with Pakistan, US, Norway, Germany, Korea, Russia,Taiwan customers.And got continue orders from them every month.

 

Q: How about the MOQ?

A: Normally we dont have MOQ requirement, We always expect more opportunities with you. But for some special material or special size let's communicate the actual status.

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