ASTM A434-06(2012)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:A434 −06(Reapproved 2012)
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
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.Anumber 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 3.1.4 Dimensions, including length (if hot-wrought bars are
for cold finishing, the cold-finished size should also be
1.1 This specification covers hot-wrought and cold-finished
specified),
quenched and tempered alloy steel bars.
3.1.5 ASTM designation and date of issue,
1.2 Hot-wrought bars are available in three strength level
3.1.6 Chemical composition grade (Section 5),
classes designated BB, BC, and BD, and cold-finished bars in
3.1.7 Strength class (Table 1),
two strength level classes designated BB and BC.The bars are
3.1.8 Test report, if required (Section 11),
available in the conditions specified in 4.4 subject to the size
3.1.9 Supplementary Requirements or Special
limitations shown.
Requirements, if required, and
3.1.10 End use.
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
NOTE 1—A typical ordering description is as follows: 10 000 lb,
conversions to SI units that are provided for information only
Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter × 10 ft,
ASTM A434 dated ____, Grade 4140, Class BB, Test Report Required,
and are not considered standard.
Motor Shafts.
2. Referenced Documents
4. Materials and Manufacture
2.1 ASTM Standards:
4.1 Melting Practice—The steel shall be made by one or
A29/A29MSpecification for Steel Bars, Carbon and Alloy,
more of the following primary processes: open-hearth, basic-
Hot-Wrought, General Requirements for
oxygen, or electric-furnace. The primary melting may incor-
A108Specification for Steel Bar, Carbon and Alloy, Cold-
porate separate degassing or refining and may be followed by
Finished
secondary melting using electroslag remelting or vacuum arc
A370Test Methods and Definitions for Mechanical Testing
remelting. Where secondary melting is employed, the heat
of Steel Products
shall be defined as all of the ingots remelted from a single
E112Test Methods for Determining Average Grain Size
primary heat.
4.2 Discard—Sufficient discard shall be made to secure
3. Ordering Information
freedom from injurious piping and undue segregation.
3.1 Orders for material under this specification should
4.3 Slow Cooling—Hot-wrought alloy bars shall, immedi-
include the following information:
ately after rolling, be allowed to cool to a temperature below
3.1.1 Quantity (weight or number of pieces),
thecriticalrangeundersuitableconditionstopreventinjuryby
3.1.2 Name of material (heat-treated alloy steel bars),
too rapid cooling.
3.1.3 Method of finish (condition) (4.4),
4.4 Condition—Barsshallbefurnishedinoneofthefollow-
ing conditions, as specified by the purchaser. Generally, size
limits for various methods of processing round bars are:
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
Hot-wrought or hot- 9 ⁄2 in. (241.3 mm), max
A01.15 on Bars. wrought descaled
Current edition approved March 1, 2012. Published April 2012. Originally Cold-drawn ⁄8 to 4 in. (3.2 to 102 mm), incl
approved in 1959. Last previous edition approved in 2006 as A434–06. DOI: Cold-drawn, ground, and pol- ⁄8 to 4 in. (3.2 to 102 mm), incl
ished
10.1520/A0434-06R12.
Turned and polished ⁄4 to 9 in. (19.1 to 229 mm),
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
incl
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Turned, ground, and polished ⁄4 to 9 in. (19.1 to 229 mm),
Standards volume information, refer to the standard’s Document Summary page on
incl
the ASTM website.
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A434−06(Reapproved 2012)
A434−06 (2012)
TABLE 1 Tensile Properties
NOTE 1—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, Tensile Strength, Elongation Reduction SAE or AISI Repre-
A
ksi (MPa) min, ksi (MPa) in 2 in. or of Area, sentative Grade
B
50 mm, min, % Types
min, %
1 ⁄2 (38.1) and under 90 (620) 110 (760) 20 50 3100, 4100,
1 1
Over 1 ⁄2 to 2 ⁄2 (38.1 to 63.5), incl 80 (550) 105 (720) 20 50 8600, 8700
C
BB Over 2 ⁄2 to 4 (63.5 to 114), incl 75 (520) 100 (690) 20 50
Over 4 to 7 (114 to 178), incl 75 (520) 95 (660) 20 50
Over 7 to 9 ⁄2 (178 to 241.3), incl 65 (450) 90 (620) 18 40
1 ⁄2 (38.1) and under 110 (760) 130 (900) 16 50 3100, 4100, 6100,
1 1
Over 1 ⁄2 to 2 ⁄2 (38.1 to 63.5), incl 105 (720) 125 (860) 16 50 8600, 8700
J
C
BC Over 2 ⁄2 to 4 (63.5 to 114), incl 95 (660) 115 (790) 16 45
Over 4 to 7 (114 to 178), incl 85 (590) 110 (760) 16 45 3100, 4100
J
Over 7 to 9 ⁄2 (178 to 241.3), incl 80 (550) 105 (720) 15 40 4300, 9800
1 ⁄2 (38.1) and under 130 (900) 155 (1070) 14 35 4100, 4300,
1 1
Over 1 ⁄2 to 2 ⁄2 (38.1 to 63.5), incl 120 (830) 150 (1030) 14 35 9800
C
BD Over 2 ⁄2 to 4 (63.5 to 114), incl 110 (760) 140 (960) 14 35
Over 4 to 7 (114 to 178), incl 105 (720) 135 (930) 14 35
Over 7 to 9 ⁄2 (178 to 241.3), incl 100 (690) 130 (900) 14 35
A
The carbon content of all steels listed in this column may vary up to 0.55 % max, as agreed upon by the manufacturer and the purchaser.
B
Determined by the 0.2 % offset method.
C
Class BB, BC, BD hot-wrought; Class BB, BC cold-finished.
4.5 Heat Treatment: of developing the mechanical properties, the manufacturer
4.5.1 Heat treatment shall include quenching and tempering shall notify the purchaser and whenever possible suggest an
for all classes of material. The material shall be uniformly alternative grade.
heated to the austenitizing temperature, soaked for a sufficient
5.3 Representative grade types listed for the respective
length of time to produce the desired structure (a lot thus
classes and bar sizes in Table 1 are for information only.
heatedbeing
...