Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered

ABSTRACT
This specification covers hot-wrought and cold-finished quenched and tempered alloy steel bars. The steel materials shall be melt processed by using open-heart, basic oxygen, or electric furnace and shall conform to the austenitic grain size requirement. Tension tests shall be performed wherein the steel specimens shall conform to the required values of yield strength, tensile strength, and elongation.
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 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.

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Publication Date
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ASTM A434-06 - Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A434 – 06
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
1
and Tempered
This standard is issued under the fixed designation A434; 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.
1. Scope* 3.1.5 ASTM designation and date of issue,
3.1.6 Chemical composition grade (Section 5),
1.1 This specification covers hot-wrought and cold-finished
3.1.7 Strength class (Table 1),
quenched and tempered alloy steel bars.
3.1.8 Test report, if required (Section 11),
1.2 Hot-wrought bars are available in three strength level
3.1.9 Supplementary Requirements or Special Require-
classes designated BB, BC, and BD, and cold-finished bars in
ments, if required, and
two strength level classes designated BB and BC. The bars are
3.1.10 End use.
available in the conditions specified in 4.4 subject to the size
limitations shown.
NOTE 1—A typical ordering description is as follows: 10 000 lb,
1.3 The values stated in inch-pound units are to be regarded Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter 3 10 ft,
ASTM A434 dated ____, Grade 4140, Class BB, Test Report Required,
as standard. The values given in parentheses are mathematical
Motor Shafts.
conversions to SI units that are provided for information only
and are not considered standard.
4. Materials and Manufacture
2. Referenced Documents 4.1 Melting Practice—The steel shall be made by one or
2
more of the following primary processes: open-hearth, basic-
2.1 ASTM Standards:
oxygen, or electric-furnace. The primary melting may incor-
A29/A29M Specification for Steel Bars, Carbon and Alloy,
porate separate degassing or refining and may be followed by
Hot-Wrought, General Requirements for
secondary melting using electroslag remelting or vacuum arc
A108 Specification for Steel Bar, Carbon and Alloy, Cold-
remelting. Where secondary melting is employed, the heat
Finished
shall be defined as all of the ingots remelted from a single
A370 Test Methods and Definitions for Mechanical Testing
primary heat.
of Steel Products
4.2 Discard—Sufficient discard shall be made to secure
E112 Test Methods for Determining Average Grain Size
freedom from injurious piping and undue segregation.
3. Ordering Information 4.3 Slow Cooling—Hot-wrought alloy bars shall, immedi-
ately after rolling, be allowed to cool to a temperature below
3.1 Orders for material under this specification should
the critical range under suitable conditions to prevent injury by
include the following information:
too rapid cooling.
3.1.1 Quantity (weight or number of pieces),
4.4 Condition—Bars shall be furnished in one of the fol-
3.1.2 Name of material (heat-treated alloy steel bars),
lowing conditions, as specified by the purchaser. Generally,
3.1.3 Method of finish (condition) (4.4),
size limits for various methods of processing round bars are:
3.1.4 Dimensions, including length (if hot-wrought bars are
1
Hot-wrought or hot- 9 ⁄2 in. (241.3 mm), max
for cold finishing, the cold-finished size should also be speci-
wrought descaled
fied),
1
Cold-drawn ⁄8 to 4 in. (3.2 to 102 mm), incl
1
Cold-drawn, ground, and pol- ⁄8 to 4 in. (3.2 to 102 mm), incl
ished
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
3
Turned and polished ⁄4 to 9 in. (19.1 to 229 mm),
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
incl
A01.15 on Bars.
3
Turned, ground, and polished ⁄4 to 9 in. (19.1 to 229 mm),
Current edition approved May 1, 2006. Published May 2006. Originally
incl
approved in 1959. Last previous edition approved in 2004 as A434 – 04. DOI:
10.1520/A0434-06. 4.5 Heat Treatment:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.5.1 Heat treatment shall include quenching and tempering
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
for all classes of material. The material shall be uniformly
Standards volume information, refer to the standard’s Document Summary page on
heated to the austenitizing temperature, soaked for a sufficient
the ASTM website.
*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.
1

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A434 – 06
TABLE 1 Tensile Properties
NOTE—The mechanical properties of hot-wrought bars ordered for cold finishing, shall be governed by the cold-finished size.
Class Diameter, in. (mm) Yield Strength, min,
...

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