ASTM A304-05e2
(Specification)Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements
Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements
ABSTRACT
This specification covers carbon and alloy steel bars subject to end-quench hardenability requirements. The methods for estimating the hardness value of the material are presented. Method A is the minimum and maximum hardness values at any desired distance, Method B is the minimum and maximum distances at which any desired hardness value occurs, Method C is the two maximum hardness values at two desired distances, Method D is the two minimum hardness values at two desired distances, and Method E is any minimum hardness plus any maximum hardness. The heat analysis shall conform to the requirements as to chemical composition. The fine austenitic grain size requirements of the steel material are presented in details. The end-quench hardenability shall conform to the requirements specified on the purchase order. The test specimen requirements indicates that, the number and location of test specimens shall be in accordance with the manufacturers standard practice and shall adequately represent the hardenability of each heat, also, all forged or rolled hardenability test specimens must be normalized prior to testing. The grain size and end-quench hardenability test methods are presented in details.
SCOPE
1.1 This specification covers hot-worked alloy, carbon, and carbon-boron steels in a variety of compositions and sizes, which may attain specified depth of hardening in the end quench test. These steel compositions are identified by the suffix letter "H" added to the conventional grade number.
1.2 This specification provides for analyses other than those listed under Tables 1 and 2. Special hardenability limits are also permissible when approved by the purchaser and manufacturer.
1.3 The values stated in inch-pound units are to be regarded as the standard.
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Standards Content (Sample)
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Designation: A304 – 05
Standard Specification for
Carbon and Alloy Steel Bars Subject to End-Quench
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Hardenability Requirements
This standard is issued under the fixed designation A304; 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.
This standard has been approved for use by agencies of the Department of Defense.
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´ NOTE—Editorial changes made to text and Figure 18 in July 2005.
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´ NOTE—Correction made editorially to UNS 15260 in Table 2 in August 2005.
1. Scope* 3.1.1 hardenability—the relative ability of a steel to harden
under heat treatment becomes apparent in the degree to which
1.1 This specification covers hot-worked alloy, carbon, and
the material hardens when quenched at different cooling rates.
carbon-boron steels in a variety of compositions and sizes,
It is measured quantitatively, usually by noting the extent or
which may attain specified depth of hardening in the end
depth of hardening of a standard size and shape test specimen
quench test. These steel compositions are identified by the
in a standardized quench. In the “end-quench” test the “depth
suffix letter “H” added to the conventional grade number.
of hardening” is the distance along the specimen from the
1.2 This specification provides for analyses other than those
quenched end to a given hardness.
listed under Tables 1 and 2. Special hardenability limits are
also permissible when approved by the purchaser and manu-
4. Ordering Information
facturer.
4.1 Orders for material under this specification should
1.3 The values stated in inch-pound units are to be regarded
include the following information, in proper sequence:
as the standard.
4.1.1 Quantity (weight),
2. Referenced Documents 4.1.2 Name of material (alloy, carbon, or carbon-boron
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steel),
2.1 ASTM Standards:
4.1.3 Cross-sectional shape,
A29/A29M Specification for Steel Bars, Carbon and Alloy,
4.1.4 Size,
Hot-Wrought, General Requirements for
4.1.5 Length,
A108 Specification for Steel Bar, Carbon and Alloy, Cold-
4.1.6 Grade,
Finished
4.1.7 End-quenched hardenability (see Section 9),
A255 Test Methods for Determining Hardenability of Steel
4.1.8 Report of heat analysis, if desired (see Section 7),
E112 Test Methods for Determining Average Grain Size
4.1.9 Special straightness, if required,
E527 Practice for Numbering Metals and Alloys in the
4.1.10 ASTM designation and date of issue,
Unified Numbering System (UNS)
4.1.11 End use or special requirements, and
3. Terminology
4.1.12 Leaded steel, when required.
3.1 Definitions of Terms Specific to This Standard:
NOTE 1—A typical ordering description is as follows: 10 000 lb, alloy
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bars, round, 4.0 in. dia by 10 ft, Grade 1340H, J 40/56 = ⁄16 in., heat
analysis required, ASTM A304, dated ________, worm gear.
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This specification is under the jurisdiction of ASTM Committee A01 on Steel, 4.2 The purchaser shall specify the desired grade, including
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
the suffix letter “H,” in accordance with Table 1 or Table 2.
A01.15 on Bars.
4.3 Band limits are shown graphically and as tabulations in
Current edition approved July 28, 2005. Published March 2005. Originally
Figs. 2-87, inclusive. For specifications purposes, the tabulated
approved in 1947. Last previous edition approved in 2004 as A304 – 04. DOI:
10.1520/A0304-05E02.
values of Rockwell C hardness are used. Values below 20
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Rockwell C hardness (20 HRC) are not specified because such
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
values are below the normal range of the C scale. The graphs
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. are shown for convenience in estimating the hardness values
*A Summary of Changes section appears at the end of this standard.
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A304 – 05
obtainable at various locations on the end quench test bar and 6. General Requirements
for various locations in oil or water quenched rounds. The
6.1 Material furnished under this specification shall con-
relationship between end-quench distance and bar diameter is
form to the applicable requirements of the current edition of
approximate and should be used only as a guide.
Specification A29/A29M or A108, unless otherwise provided
4.4 Two points from the tabulated values are commonly
for in this specification.
designat
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