ASTM B968/B968M-16(2022)

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.
Designation: B968/B968M − 16 (Reapproved 2022)
Standard Test Method for
Flattening of Copper and Copper-Alloy Pipe and Tube
This standard is issued under the fixed designation B968/B968M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 4. Summary of Test Method
1.1 This test method establishes the requirements for the 4.1 The prepared test sample is flattened in a press to a
flattening test for copper and copper alloy pipe and tube of all
specified maximum thickness, and then inspected for defects of
sizes. The method addresses both inch-pound and metric a size and nature that would interfere with the intended
considerations, and both seamless and welded product.
application of the product specification.
1.2 Units—The values stated in either inch-pound units or
5. Significance and Use
SI units are to be regarded separately as standard. Within the
text, SI units are shown in brackets. The values stated in each
5.1 When properly performed and interpreted, the flattening
system are not necessarily exact equivalents; therefore, to
test will provide information about the relative ductility of a
ensure conformance with the standard, each system shall be
tubeandpresenceofsurfacedefects.Forweldedtubeproducts,
used independently of the other, and values from the two
the test will provide information on the integrity of the weld
systems shall not be combined.
seam.
1.3 This standard does not purport to address all of the
5.2 Incertainproductspecificationswhichestablishrequire-
safety concerns, if any, associated with its use. It is the
ments for tubes of sizes greater than 4 in. [100 mm], the test
responsibility of the user of this standard to establish appro-
may be allowed as a substitute to the expansion pin test in Test
priate safety, health, and environmental practices and deter-
Method B153.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
6. Apparatus
dance with internationally recognized principles on standard-
6.1 Testing Machine (Press)—Any type of testing machine;
ization established in the Decision on Principles for the
either hydraulically or mechanically operated, that will exert
Development of International Standards, Guides and Recom-
pressure sufficient to flatten the pipe or tube to the required
mendations issued by the World Trade Organization Technical
degree.
Barriers to Trade (TBT) Committee.
6.2 MicrometerCaliper—Anymeasuringdevicethathasthe
2. Referenced Documents
capability to measure a flattened sample approximately three
2.1 ASTM Standards:
(3) times the product wall thickness.
B153 Test Method for Expansion (Pin Test) of Copper and
Copper-Alloy Pipe and Tubing
7. Sampling and Test Specimen Preparation
B846 Terminology for Copper and Copper Alloys
7.1 Forseamlessproductuptoandincluding4in.[100mm]
3. Terminology outside diameter:
7.1.1 Atest specimen shall be cut to a length that will allow
3.1 For definitions of terms related to copper and copper
thetubetobeflattenedatthree(3)placesalongthelength,with
alloys, refer to Terminology B846.
each flattened area to be at least 2 in. [50 mm] in length. When
1 the temper is other than annealed, the sample may be annealed
This test method is under the jurisdiction ofASTM Committee B05 on Copper
prior to testing.
and Copper Alloys and is the direct responsibility of Subcommittee B05.06 on
Methods of Test.
7.2 For welded product up to and including 4 in. [100 mm]
Current edition approved May 1, 2022. Published May 2022. Originally
in outside diameter:
approved in 2009. Last previous edition approved in 2016 as B968/B968M – 16.
DOI: 10.1520/B0968_B0968M-16R22.
7.2.1 Atest specimen shall be cut to a length that will allow
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the tube to be flattened along the length, so a total of at least
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
12 in. [305 mm] is flattened. When the temper is other than
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. annealed, the sample is allowed to be annealed prior to testing.
*A Summary of Changes section appears at the end of this standard
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B968/B968M − 16 (2022)
7.3 For seamless product over 4 in. [100 mm] in outside 8.3.1 Each test specimen shall be flattened once in a press.
diameter: The flattened area shall be at least 4 in. [100 mm] in length.An
7.3.1 Atest specimen shall be cut to a length that will allow acceptably flattened tube specimen shall allow a micrometer
the tube to be flattened once, with the flattened area to be at caliper set at three (3) times the wall thickness to pass freely
least 4 in. [100 mm] in length. When the temper is other tha
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