18.1 For purpose 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 E29.
Property
Rounded Unit for Observed or
Calculated Value
Chemical composition
nearest unit in the last
right-hand significant
digit used in expressing
the limiting value
Tensile strength
nearest ksi [nearest 5 MPa]
Elongation
nearest 1 %
Expansion
nearest 1 %
Grain size
nearest multiple of 0.005 mm
РефератThis specification establishes the requirements for condenser, evaporator, and heat exchanger U-bends that are manufactured from seamless copper and copper alloy tube. The material of manufacture shall be of such quality and purity that the finished product shall have the properties and characteristics specified. The material shall conform to the chemical composition requirements specified. Tensile test, expansion test, flattening test, mercurous nitrate test or ammonia vapor test, nondestructive examination, hydrostatic test, and pneumatic test shall be made to conform to the requirements specified.
Область применения1.1 This specification2 establishes the requirements for condenser, evaporator, and heat exchanger U-bend tubes that are manufactured from seamless copper and copper alloy tube.
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This specification is applicable to product 2 in. [50 mm] or less, inclusive, in diameter.
1.4 The product shall be produced from one of the following coppers or copper alloys, as specified in the ordering information:
Copper or
Copper Alloy
UNS No.
Previously Used
Designation
Type of Metal
C10200
OFA
oxygen-free without residual deoxidants
C10300
...
oxygen-free, extra low phosphorus
C10800
...
oxygen-free, low phosphorus
C12000
DLPA
phosphorized, low residual phosphorus
C12200
DHPA
phosphorized, high residual phosphorus
C14200
DPAA
phosphorized, arsenical
C19200
...
phosphorized, 1 % iron
C23000
...
red brass
C44300
Type B
admiralty metal
C44400
Type C
admiralty metal
C44500
Type D
admiralty metal
C60800
...
aluminum bronze
C68700
Type B
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)
C72200
...
copper-nickel
(A) Designations listed in Classification B224.1.5 The following safety hazard caveat pertains only to the test methods described in this specification.
1.5.1 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. (Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.)
1.6 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.