ASTM A434-04

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Designation: A 434 – 04
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
1
and Tempered
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 3.1.6 Chemical composition grade (Section 5),
3.1.7 Strength class (Section 8 and Table 1),
1.1 This specification covers hot-wrought and cold-finished
3.1.8 Test report, if required (Section 11),
quenched and tempered alloy steel bars.
3.1.9 Supplementary Requirements or Special Require-
1.2 Hot-wrought bars are available in three strength level
ments, if required, and
classes designated BB, BC, and BD, and cold-finished bars in
3.1.10 End use.
two strength level classes designated BB and BC. The bars are
available in the conditions specified in 4.4 subject to the size
NOTE 1—A typical ordering description is as follows: 10 000 lb,
limitations shown. 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,
1.3 The values stated in inch-pound units are to be regarded
Motor Shafts.
as the standard. The values given in parentheses are for
information only.
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-
A 29/A 29M Specification for Steel Bars, Carbon and
porate separate degassing or refining and may be followed by
Alloy, Hot-Wrought, General Requirements for
secondary melting using electroslag remelting or vacuum arc
A 108 Specification for Steel Bar, Carbon and Alloy,
remelting. Where secondary melting is employed, the heat
Cold-Finished
shall be defined as all of the ingots remelted from a single
A 370 Test Methods and Definitions for MechanicalTesting
primary heat.
of Steel Products
4.2 Discard—Sufficient discard shall be made to secure
E 112 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
3.1.5 ASTM designation and date of issue, 1
Cold-drawn, ground, and pol- ⁄8 to 4 in. (3.2 to 102 mm), incl
ished
3
Turned and polished ⁄4 to 9 in. (19.1 to 229 mm),
incl
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
3
Turned, ground, and polished ⁄4 to 9 in. (19.1 to 229 mm),
Stainless Steel, and RelatedAlloys, and is the direct responsibility of Subcommittee
incl
A01.15 on Bars.
Current edition approved March 1, 2004. Published April 2004. Originally
4.5 Heat Treatment:
published asA 434–59T. ReplacesA 286 andA 364. Last previous edition approved
4.5.1 Heat treatment shall include quenching and tempering
in 2000 as A 434–90a (2000).
2
for all classes of material. The material shall be uniformly
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A 434–04
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, Tensile Strength, Elongation Reduction SAE or AISI Repre-
A
ksi (MPa) min, ksi (MPa) in 2 in. or of Area, sentati
...