ASTM A914/A914M-16

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Designation:A914/A914M −16
Standard Specification for
Steel Bars Subject to Restricted End-Quench Hardenability
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Requirements
This standard is issued under the fixed designationA914/A914M; 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.
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1. Scope* 2.2 SAE Standards:
J 406 Methods of Determining Hardenability of Steels
1.1 This specification covers hot-worked alloy and carbon-
J 1268 Hardenability Bands for Carbon and Alloy H Steels
boron steels designed to attain restricted depth of hardening in
J 1868 Restricted Hardenability Bands for Selected Alloy
the end-quench test. These steel compositions are identified by
Steels
the suffix letter “RH” added to the conventional grade number.
1.2 In general, steels with restricted hardenability (RH
3. Terminology
steels) will exhibit a hardness range not greater than 5 HRC at
3.1 Definitions of Terms Specific to This Standard:
the initial position on the end-quench hardenability bar and not
3.1.1 hardenability—the relative ability of a steel to harden
greater than 65 % of the hardness range for standard H-band
under heat treatment becomes apparent in the degree to which
steels (Specification A304) in the inflection region. Generally
the material hardens when quenched at different cooling rates.
the restricted hardenability band follows the middle of the
3.1.1.1 Discussion—Hardenability is measured
corresponding standard H-band. An example of the RH band
quantitatively, usually by noting the extent or depth of hard-
compared with the H band is given for Grade 4140 in Fig. 1.
ening of a standard size and shape test specimen in a
1.2.1 ThevaluesstatedineitherSIunitsorinch-poundunits
standardized quench. In the end-quench test the depth of
are to be regarded separately as standard. The values stated in
hardening is the distance along the specimen from the
each system may not be exact equivalents; therefore, each
quenched end to a given hardness.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
4. Ordering Information
with the standard.
4.1 Orders for material under this specification should
1.3 This specification is expressed in both inch-pound units
include the following information, in proper sequence:
and SI units. However, the material will be supplied to
4.1.1 Quantity (weight),
inch-pound units unless the purchase order specifies the “M”
4.1.2 Name of material (alloy or carbon-boron steel),
specification designation.
4.1.3 Cross-sectional shape,
4.1.4 Size,
2. Referenced Documents
4.1.5 Length,
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2.1 ASTM Standards:
4.1.6 Grade,
A29/A29M SpecificationforGeneralRequirementsforSteel
4.1.7 End-quenched hardenability (see Section 9),
Bars, Carbon and Alloy, Hot-Wrought
4.1.8 Report of heat analysis, if desired (see Section 7),
A255 Test Methods for Determining Hardenability of Steel
4.1.9 Special straightness, if required,
A304 Specification for Carbon andAlloy Steel Bars Subject
4.1.10 ASTM designation and date of issue, and
to End-Quench Hardenability Requirements
4.1.11 End use or special requirements.
E112 Test Methods for Determining Average Grain Size
NOTE 1—A typical ordering description is as follows: 10 000 lb, alloy
bars, round, 4.0-in. diameter by 10 ft, Grade 4140RH, heat analysis
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required,completehardenabilitydatarequired,ASTMAXXX,[AXXXM]
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee dated _____ worm gear.
A01.15 on Bars.
4.2 The purchaser shall specify the desired grade, including
Current edition approved Dec. 1, 2016. Published December 2016. Originally
the suffix letters “RH,” in accordance with Table 1.
approved in 1992. Last previous edition approved in 2011 as A914/
A914M - 92(2011). DOI: 10.1520/A0914_A0914M-16.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
the ASTM website. PA 15096, http://www.sae.org.
*A Summary of Changes section appears at the end of this standard
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A914/A914M−16
4.3 Band limits are shown graphically and as tabulations in Where secondary melting is employed, the heat shall be
Figs. 2-23, inclusive. For specification purposes, one
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