ASTM A914/A914M-92(1999)

Standard Specification for Steel Bars Subject to Restricted End-Quench Hardenability Requirements

SCOPE
1.1 This specification covers hot-worked alloy and carbon-boron steels designed to attain restricted depth of hardening in the end-quench test. These steel compositions are identified by the suffix letter "RH" added to the conventional grade number.  
1.2 In general, steels with restricted hardenability (RH steels) will exhibit a hardness range not greater than 5 HRC at the initial position on the end-quench hardenability bar and not greater than 65% of the hardness range for standard H-band steels (Specification A304) in the inflection region. Generally the restricted hardenability band follows the middle of the corresponding standard H-band. An example of the RH band compared with the H band is given for Grade 4140 in Fig. 1.
1.3 This specification is expressed in both inch-pound units and SI units. However, the material will be supplied to inch-pound units unless the purchase order specifies the "M" specification designation.

General Information

• Status: Historical
• Publication Date: 14-Dec-1992
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.15 - Bars

Relations

• Replaces: ASTM A914/A914M-92 - Standard Specification for Steel Bars Subject to Restricted End-Quench Hardenability Requirements
• Effective Date: 15-Dec-1992
• Replaced By: ASTM A914/A914M-92(1999)e1 - Standard Specification for Steel Bars Subject to Restricted End-Quench Hardenability Requirements
• Effective Date: 15-Dec-1992

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 914/A 914M – 92 (Reapproved 1999) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Steel Bars Subject to Restricted End-Quench Hardenability
1
Requirements
This standard is issued under the fixed designation A 914/A 914M; 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.
1. Scope 3. Terminology
1.1 This specification covers hot-worked alloy and carbon- 3.1 Definitions of Terms Specific to This Standard:
boron steels designed to attain restricted depth of hardening in 3.1.1 hardenability—the relative ability of a steel to harden
the end-quench test. These steel compositions are identified by under heat treatment becomes apparent in the degree to which
the suffix letter “RH” added to the conventional grade number. the material hardens when quenched at different cooling rates.
1.2 In general, steels with restricted hardenability (RH 3.1.1.1 Discussion— Hardenability is measured quantita-
steels) will exhibit a hardness range not greater than 5 HRC at tively, usually by noting the extent or depth of hardening of a
the initial position on the end-quench hardenability bar and not standard size and shape test specimen in a standardized
greater than 65 % of the hardness range for standard H-band quench. In the end-quench test the depth of hardening is the
steels (Specification A 304) in the inflection region. Generally distance along the specimen from the quenched end to a given
the restricted hardenability band follows the middle of the hardness.
corresponding standard H-band. An example of the RH band
4. Ordering Information
compared with the H band is given for Grade 4140 in Fig. 1.
1.3 This specification is expressed in both inch-pound units 4.1 Orders for material under this specification should
include the following information, in proper sequence:
and SI units. However, the material will be supplied to
inch-pound units unless the purchase order specifies the “M” 4.1.1 Quantity (weight),
4.1.2 Name of material (alloy or carbon-boron steel),
specification designation.
4.1.3 Cross-sectional shape,
2. Referenced Documents
4.1.4 Size,
2.1 ASTM Standards: 4.1.5 Length,
A 29/A 29M Specification for Steel Bars, Carbon and Alloy, 4.1.6 Grade,
Hot-Wrought and Cold Finished, General Requirements 4.1.7 End-quenched hardenability (see Section 9),
2
for 4.1.8 Report of heat analysis, if desired (see Section 7),
A 255 Test Methods for Determining Hardenability of 4.1.9 Special straightness, if required,
2
Steel 4.1.10 ASTM designation and date of issue, and
A 304 Specification for Steel Bars, Alloy, Subject to End- 4.1.11 End use or special requirements.
2
Quench Hardenability Requirements
NOTE 1—A typical ordering description is as follows: 10 000 lb, alloy
3
E 112 Test Method for Determining Average Grain Size
bars, round, 4.0-in. diameter by 10 ft, Grade 4140RH, heat analysis
4
E 527 Practice for Numbering Metals and Alloys (UNS)
required, complete hardenability data required, ASTM AXXX, [AXXXM]
5
2.2 SAE Standards:
dated _____ worm gear.
J 406 Methods of Determining Hardenability of Steels
4.2 The purchaser shall specify the desired grade, including
J 1268 Hardenability Bands for Carbon and Alloy H Steels
the suffix letters “RH”, in accordance with Table 1.
J 1868 Restricted Hardenability Bands for Selected Alloy
4.3 Band limits are shown graphically and as tabulations in
Steels
Figs. 2-23, inclusive. For specification purposes, one must use
tabulated values of Rockwell hardness (HRC) as a function of
1
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
distance from the quenched end of the hardenability bar, either
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
in inch-pound units (sixteenths of an inch) or in SI units
A01.15 on Bars.
(millimetres). Values below 20 HRC are not specified because
Current edition approved Dec. 15, 1992. Published February 1993.
2
Annual Book of ASTM Standards, Vol 01.05. such values are not accurate.
3
Annual Book of ASTM Standards, Vol 03.01.
4.3.1 Band limits shown graphically are so depicted for
4
Annual Book of ASTM Standards, Vol 01.01.
convenience in estimating the hardness values at various
5
Available from Society of Automotive Engineers, 400 Commonwealth Dr.,
intermediate locations on the end quench test bar for quick
Warrendale, PA 15096.
1

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A 914/A 914M
comparisons of the various RH gra
...