Значение и использование

For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E 29.

PropertyRounded Unit for Observed or
Calculated Value Chemical compositionnearest unit in the last righthand place
of figures Tensile strength and yield strengthnearest ksi (Nearest 5 MPa) Grain size: Up to 0.055 mm, incl.,
Over 0.055 mmnearest multiple of 0.005 mm
to the nearst 0.010 mm Expansion: Nearest 1 %

Реферат

This specification covers welded tube of specific copper and various copper alloys of a limited range of diameters, for use in surface condensers, evaporators, heat exchangers, and general engineering applications. The product shall be manufactured by forming the material into a tubular shape on a suitable forming mill. Welding of tube shall be accomplished by forge-welding, fusion-welding, or full finishing that produces a forge weld leaving no crevice in the weld seam visible to the unaided eye. The tube shall conform to tensile strength and yield strength requirements, and shall be subject to expansion, flattening, and reverse bend tests. Mercurous nitrate or ammonia vapor tests shall be required only for selected UNS Numbers of Copper Alloys. Each tube shall be subjected to eddy-current, hydrostatic, and pneumatic tests.

Область применения

1.1 This specification covers welded tube of copper and various copper alloys up to 3¹/₈in., inclusive, in diameter, for use in surface condensers, evaporators, heat exchangers, and general engineering applications. The following coppers or copper alloys are involved:

Copper or
Copper Alloy UNS No.²Previously Used
DesignationType of Metal C10800^A...oxygen-free, low phosphorus C12200^A DHP phosphorized, high residual phosphorus C19400...copper-iron alloy C23000...red brass C44300...arsenical admiralty C44400...antimonial admiralty C44500...phosphorized admiralty C68700...arsenical aluminum brass C70400...95-5 copper-nickel C70600...90-10 copper-nickel C70620...90-10 copper-nickel (Modified for Welding) C71000...80-20 copper-nickel C71500...70-30 copper-nickel C71520...70–30 copper-nickel (Modified for Welding) C71640...copper-nickel-iron-manganese C72200...... ____________

^A Copper UNS Nos. C10800 and C12200 are classified in Classification B 224.

1.2 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. (Warning—Mercury is a definite health hazard in use and disposal. (See 12.1.1.))