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热轧与冷精轧经回火及淬火的合金钢棒 Designation: A 434 – 06
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
and Tempered1
This standard is issued under the fixed designation A 434; 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*
1.1 This specification covers hot-wrought and cold-finished
quenched and tempered alloy steel bars.
1.2 Hot-wrought bars are available in three strength level
classes designated BB, BC, and BD, and cold-finished bars in
two strength level classes designated BB and BC. The bars are
available in the conditions specified in 4.4 subject to the size
limitations shown.
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard.
2. Referenced Documents
2.1
ASTM Standards:2
A 29/A 29M Specification for Steel Bars, Carbon and Alloy,
Hot-Wrought, General Requirements for
A 108 Specification for Steel Bar, Carbon and Alloy, Cold-
Finished
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
E 112 Test Methods for Determining Average Grain Size
3. Ordering Information
3.1 Orders for material under this specification should
include the following information:
3.1.1 Quantity (weight or number of pieces),
3.1.2 Name of material (heat-treated alloy steel bars),
3.1.3 Method of finish (condition) (4.4),
3.1.4 Dimensions, including length (if hot-wrought bars are
3.1.5 ASTM designation and date of issue,
3.1.6 Chemical composition grade (Section 5),
3.1.8 Test report, if required (Section 11),
3.1.9 Supplementary Requirements or Special Require-
ments, if required, and
3.1.10 End use.
NOTE
1—A typical ordering description is as follows: 10 000 lb,
Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter
3 10 ft,
ASTM A 434 dated ____, Grade 4140, Class BB, Test Report Required,
Motor Shafts.
4. Materials and Manufacture
4.1
Melting Practice—The steel shall be made by one or
more of the following primary processes: open-hearth, basic-
oxygen, or electric-furnace. The primary melting may incor-
porate separate degassing or refining and may be followed by
secondary melting using electroslag remelting or vacuum arc
remelting. Where secondary melting is employed, the heat
shall be defined as all of the ingots remelted from a single
primary heat.
4.2
Discard—Sufficient discard shall be made to secure
freedom from injurious piping and undue segregation.
4.3
Slow Cooling—Hot-wrought alloy bars shall, immedi-
ately after rolling, be allowed to cool to a temperature below
the critical range under suitable conditions to prevent injury by
too rapid cooling.
4.4
Condition—Bars shall be furnished in one of the fol-
lowing conditions, as specified by the purchaser. Generally,
size limits for various methods of processing round bars are:
for cold finishing, the cold-finished size should also be speci-
fied),
1 This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.15 on Bars.
Current edition approved May 1, 2006. Published May 2006. Originally
approved in 1959. Last previous edition approved in 2004 as A 434 – 04.
Hot-wrought or hot-
wrought descaled
Cold-drawn
Cold-drawn, ground, and pol-
ished
Turned and polished
Turned, ground, and polished
4.5
Heat Treatment:
91⁄2 in. (241.3 mm), max
1⁄8
to 4 in. (3.2 to 102 mm), incl
1⁄8
to 4 in. (3.2 to 102 mm), incl
3⁄4
to 9 in. (19.1 to 229 mm),
incl
3⁄4
to 9 in. (19.1 to 229 mm),
incl
2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Standards
volume information, refer to the standard’s Document Summary page on
the ASTM website.
4.5.1 Heat treatment shall include quenching and tempering
for all classes of material. The material shall be uniformly
heated to the austenitizing temperature, soaked for a sufficient
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
Copyright ASTM International
1
Provided by IHS under license with ASTM
Copyright by ASTM Int'l (all rights reserved);
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Reproduction authorized per License Agreement with Monique Tyree (ASTMIHS Account); Mon May 15 13:45:23 EDT 2006
A 434 – 06
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