ASTM-B68 Standard Specification for Seamless Copper Tube, Bright Annealed

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This specification covers bright annealed seamless copper tube suitable for use in refrigeration,oil lines, gasoline lines, and so forth, where tube with an interior surface essentially free from scale and dirt is required. The material of manufacture shall be billets, cast bars, or tube of the copper UNS No. C10200, C10300, C10800, C12000, or C12200 and shall be of such soundness as to be suitable for processing into the tubular products described. The tube shall be manufactured by such hot- or cold-working process as to produce a homogeneous uniform wrought structure in the finished product. The material shall conform to the required chemical composition specified. The tube shall be furnished in either O50 or O60 annealed tempers. The tube shall have the minimum tensile strength and elongation values as specified when tested. The outside diameter of the tube furnished shall be capable of being expanded to the specified value when tested. The tube shall be capable of being flattened in accordance with the method described. Copper UNS nos. C10200, C12000, and C12200 shall be capable of passing the embrittlement test. Tubes that do not actuate the signaling device of the testing unit shall be considered as conforming to the requirements of the examination.




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1.1 This specification establishes the requirements for bright annealed seamless copper tube suitable for use in refrigeration, oil lines, gasoline lines, and so forth, where tube with an interior surface essentially free from scale and dirt is required.

1.1.1 Tubes made from any of the following Copper UNS No. designations shall be supplied, unless otherwise specified in the contract or purchase order:

Copper UNS No.2

Type of Copper






Oxygen-free, (OFXLP)


Oxygen-free, (OFLP)


Phosphorus deoxidized, low residual phosphorus


Phosphorus deoxidized, high residual phosphorus

1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


bright annealed; copper tube; seamless tube;; ICS Number Code 77.150.30 (Copper products)

To find similar documents by ASTM Volume:

02.01 (Copper and Copper Alloys)

To find similar documents by classification:

77.150.30 (Copper products)

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Publication Date

April 1, 2019

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Page Count

6 pages

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