ASTM B598-98

Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys

SCOPE
1.1 This practice covers the determination of the yield strength (0.01%, 0.02%, and 0.05% offset), at room temperature. It is intended for copper alloys in tempers commonly used for spring applications, and materials thicker than 0.010 in. (0.25 mm).  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 This standard does not purport to address all of the safety problems, 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.

General Information

• Status: Historical
• Publication Date: 09-Oct-1998
• ICS: 77.120.30 - Copper and copper alloys
• Technical Committee: B05 - Copper and Copper Alloys
• Drafting Committee: B05.06 - Methods of Test

Relations

• Replaced By: ASTM B598-98(2004) - Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys
• Effective Date: 01-May-2004
• Referred By: ASTM B740-21 - Standard Specification for Copper-Nickel-Tin Spinodal Alloy Strip
• Effective Date: 10-Oct-1998

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B 598 – 98
Standard Practice for
Determining Offset Yield Strength in Tension for Copper
Alloys
This standard is issued under the fixed designation B 598; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * 3. Terminology
1.1 This practice establishes the requirements for determin- 3.1 The definitions of terms relating to mechanical testing in
ing offset yield strength (0.01 %, 0.02 %, and 0.05 % offset) at Terminology E 6 apply.
room temperature. It is intended for copper alloys in tempers
4. Summary of Practice
commonly used for spring applications, and materials thicker
than 0.010 in. (0.25 mm). 4.1 To determine the offset yield strength, it is necessary to
acquire data (autographic or numerical) from which a stress-
1.1.1 The primary application of this practice is intended for
flat strip materials that are used for springs; however, this strain diagram may be drawn. The stress at which a specified
deviation of strain from the linear portion of the stress-strain
practice can be used for other product forms, such as wire, rod,
and bar. curve occurs is the yield strength at that particular offset.
1.2 The values stated in inch pound units are the standard.
5. Significance and Use
The SI values given in parentheses are for information only.
5.1 This practice may be used for approximating a limiting
1.3 This standard does not purport to address all of the
design stress at room temperature and, in some cases, for
safety concerns, if any, associated with its use. It is the
approximating the range of elastic behavior. Elastic limit, or
responsibility of the user of this standard to establish appro-
the greatest stress that a material is capable of sustaining
priate safety and health practices and determine the applica-
without any permanent strain remaining upon complete release
bility of regulatory limitations prior to use.
of the stress, is a more technically accurate design parameter;
2. Referenced Documents
however, the elastic limit is extremely difficult to measure in
2.1 The following documents in effect on the date that the routine testing. Caution should be used in applying such values
to predict the behavior of flat or wire springs in bending,
material is tested form a part of this practice, to the extent
referenced herein: torsion or other stress modes, or at temperatures other than that
at which the determination is made.
2.2 ASTM Standards:
E 4 Practices for Force Verification of Testing Machines
6. Apparatus
E 6 Terminology Relating to Methods of Mechanical Test-
6.1 Standard testing machine of adequate capacity, con-
ing
forming to the requirements of Practices E 4 and E 74.
E 8 Test Methods for Tension Testing of Metallic Materials
6.2 Class B-1 or more accurate Extensometers, conforming
E 74 Practice for Calibration of Force Measuring Instru-
to the requirements of Practice E 83 and suitable to the tension
ments for Verifying the Load Indication of Testing Ma-
test specimen required for the application.
chines
6.3 Extensometer Calibrator, or similar device accurate to
E 83 Practice for Verification and Classification of Exten-
0.00002 in. (0.0005 mm).
someters
7. Test Specimen
This practice is under the jurisdiction of ASTM Committee B-5 on Copper and
7.1 Tension test specimens shall be selected from Test
Copper Alloys and is the direct responsibility of Subcommittee B05.06 on Methods
Methods E 8 as appropriate for the product form.
of Test.
Current edition approved Oct. 10, 1998. Published December 1998. Originally
e1
published as B 598 – 74. Last previous edition B 598 – 86 (1992).
Annual Book of ASTM Standards, Vol 03.01.
*A Summary of Changes section appears at the end of this standard.
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