ASTM B754-22

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Designation: B754 − 17 B754 − 22
Standard Test Method for
Measuring and Recording the Deviations from Flatness in
Copper and Copper Alloy Strip
This standard is issued under the fixed designation B754; 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*
1.1 This test method establishes a procedure for the measurement of distortions in thin metal strip and the application of these
measurements to an equation that will indicate the deviation from flatness.
1.2 The distortions to be measured in this test method are dish, wavy edges, buckle, longitudinal corrugation, coil set, and
herringbone.
1.3 This test method is not intended to include the measurement of longitudinal curl, camber, or edgewise curvature, or twist.
1.4 This test method is limited to metal strip 0.0030.003 in. to 0.020 in. (0.08(0.08 mm to 0.50 mm) thick and not more than 6.0
in. (150.0 mm) wide.
1.5 Units—TheUnits—The 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.
1.6 The following safety hazard caveat pertains only to the test method(s) described in this test method. 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.
1.6 The following safety hazard caveat pertains only to the test method(s) described in this test method:
1.6.1 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.
1.7 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.
This test method is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.06 on Methods
of Test.
Current edition approved Oct. 1, 2017May 1, 2022. Published November 2017May 2022. Originally approved in 1986. Last previous edition approved 20152017 as
ɛ1
B754 – 10B754 – 17.(2015) . DOI: 10.1520/B0754-17.10.1520/B0754-22.
*A Summary of Changes section appears at the end of this standard
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B754 − 22
2. Referenced Documents
2.1 ASTM Standard:
B846 Terminology for Copper and Copper Alloys
3. Terminology
3.1 For determination of terms relating to copper and copper alloys, refer to Terminology B846.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 coil set—as applied to strip, the natural curvature remaining in a strip after it has been unwound from a coil.
4. Summary of Test Method
4.1 A prepared test specimen of a specific wrought copper or copper alloy sheet or strip of a predetermined thickness is placed
on a surface plate. The relative flatness of the sample is determined by measuring the length and height of the irregularity and
calculating the percent of deviation.
4.2 In the case of coil set, it is measured by hanging the strip against a vertical wall or post and measuring the distance of the
unrestrained hanging strip end from the wall or post. That measured distance is an indication of the amount of coil set that exists
in the strip as a result of processing.
5. Significance and Use
5.1 This test method is intended for measuring distortion in strip used for making close tolerance parts. Since distortion in this
strip would influence the shape of the part being produced and cause difficulties in feeding through close-fitting dies and other
manufacturing equipment, it is important that this material be flat.
5.2 This test method provides a universal procedure for measuring the irregularities that cause the deviation from flatness.
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B754 − 22
5.3 This test method allows the purchaser and manufacturer to inspect strip with a standard technique to a mutually agreed upon
and acceptable percentage deviation from flatness, and in the case of coil set, acceptable distance deviation from flatness.
6. Apparatus
6.1 Surface Plate, to be used as a reference flat. It must have a large enough surface area to accommodate the maximum size test
specimen. It shall be flat within 0.0002 in. (0.005 mm) per 1 in. (25 mm).
6.2 Micrometer, for measuring metal thickness. It shall be graduated in 0.0001-in. (0.0025-mm)0.0001 in. (0.0025 mm)
increments.
6.3 Height Gage, for measuring the height of irregularities. The arm of this gage must be long enough to extend beyond the center
of the widest strip to be measured. It shall be graduated in 0.001-in. (0.025-mm)0.001 in. (0.025 mm) increments.
6.4 Steel Rule, for measuring the lengths of the irregularities, and length of distan
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