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ASTM B640-12a

ASTM B640-12a

Standard Specification for Welded Copper Tube for Air Conditioning and Refrigeration Service

2016-12-27 /Active

This specification establishes the requirements for welded copper for air conditioning and refrigeration service for use in connections, repairs, and alterations. The material of manufacture shall be sheet or strip of Copper Alloy UNS No. C10100, or C10200, or C12000, or C12200 of such purity and soundness as to be suitable for processing into welded tube to meet the properties prescribed. The product shall be manufactured by forming the material into a tubular shape on a suitable forming mill and welded using an automatic process. The product shall be cold worked to the finished size and wall thickness and subsequently annealed to meet the temper properties specified. The material shall conform to the chemical compositional requirements for the Copper UNS No. designation specified. Tensile strength test, expansion test, microscopical examination, hydrogen embrittlement susceptibility, flattening test, reverse bend test, electromagnetic test, and cleanness test shall be made to conform to specified requirements.


1.1 This specification establishes the requirements for welded copper tube for air conditioning and refrigeration service for use in connections, repairs, and alterations. The tube shall be made from one of the following coppers:

Copper UNS No.

Previously Used Designation

Type of Copper






Oxygen-free electronic



Oxygen-free without-residual oxidants



Phosphorus-deoxidized, low-residual phosphorus



Phosphorus-deoxidized, high-residual phosphorus


Note 1Fittings used for soldered or brazed connections in air conditioning and refrigeration systems are described in ASME Standard B 16.22.
Note 2The assembly of copper tubular systems by soldering is described in Practice B828.
Note 3Solders for joining copper tubular systems by descirbed in Specification B32. The requirements for acceptable fluxes for these systems are described in Specification B813.

1.2 Copper UNS No. C12200 shall be furnished, unless otherwise specified. The copper tube shall be supplied in annealed coils or drawn temper straight lengths.

1.3 Units—Values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.

1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

air conditioning tube; refrigeration tube; welded copper tube; UNS No. C10100; UNS No. C10200; UNS No. C12000; UNS No. C12200
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