ASTM A304-05

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An American National Standard
Designation: A 304 – 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 A 304; 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* 4. Ordering Information
1.1 This specification covers hot-worked alloy, carbon, and 4.1 Orders for material under this specification should
carbon-boron steels in a variety of compositions and sizes, include the following information, in proper sequence:
which may attain specified depth of hardening in the end 4.1.1 Quantity (weight),
quench test. These steel compositions are identified by the 4.1.2 Name of material (alloy, carbon, or carbon-boron
suffix letter “H” added to the conventional grade number. steel),
1.2 This specification provides for analyses other than those 4.1.3 Cross-sectional shape,
listed under Tables 1 and 2. Special hardenability limits are 4.1.4 Size,
also permissible when approved by the purchaser and manu- 4.1.5 Length,
facturer. 4.1.6 Grade,
1.3 The values stated in inch-pound units are to be regarded 4.1.7 End-quenched hardenability (see Section 9),
as the standard. 4.1.8 Report of heat analysis, if desired (see Section 7),
4.1.9 Special straightness, if required,
2. Referenced Documents
4.1.10 ASTM designation and date of issue,
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2.1 ASTM Standards:
4.1.11 End use or special requirements, and
A 29/A 29M SpecificationforSteelBars,CarbonandAlloy, 4.1.12 Leaded steel, when required.
Hot-Wrought, General Requirements for
NOTE 1—A typical ordering description is as follows: 10 000 lb, alloy
A 255 Test Method for Determining Hardenability of Steel
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bars, round, 4.0 in. dia by 10 ft, Grade 1340H, J 40/56 = ⁄16 in., heat
E112 Test Methods for Determining Average Grain Size
analysis required, ASTM A 304, dated ________, worm gear.
E 527 Practice for Numbering Metals and Alloys (UNS)
4.2 The purchaser shall specify the desired grade, including
the suffix letter “H,” in accordance with Table 1 or Table 2.
3. Terminology
4.3 Band limits are shown graphically and as tabulations in
3.1 Definitions of Terms Specific to This Standard:
Figs. 2-87, inclusive. For specifications purposes, the tabulated
3.1.1 hardenability—the relative ability of a steel to harden
values of Rockwell C hardness are used. Values below 20
under heat treatment becomes apparent in the degree to which
Rockwell C hardness (20 HRC) are not specified because such
the material hardens when quenched at different cooling rates.
values are below the normal range of the C scale. The graphs
It is measured quantitatively, usually by noting the extent or
are shown for convenience in estimating the hardness values
depth of hardening of a standard size and shape test specimen
obtainable at various locations on the end quench test bar and
in a standardized quench. In the “end-quench” test the “depth
for various locations in oil or water quenched rounds. The
of hardening” is the distance along the specimen from the
relationship between end-quench distance and bar diameter is
quenched end to a given hardness.
approximate and should be used only as a guide.
4.4 Two points from the tabulated values are commonly
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designated according to one of Methods A, B, C, D, or E,
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
which are defined in the following paragraphs. Those various
A01.15 on Bars.
methods are illustrated graphically in Fig. 1.
Current edition approved March 1, 2005. Published March 2005. Originally
4.4.1 Method A—The minimum and maximum hardness
approved in 1947. Last previous edition approved in 2004 as A 304 – 04.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or valuesatanydesireddistance.ThismethodisillustratedinFig.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1 as points A-A and would be specified as 43 to 54 HRC at J3.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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A304–05
Obviously the distance selected would be that distance on the may be specified, as agreed upon between the purchaser and
end quench test bar that corre
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