ASTM A434/A434M-15

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 4.4 subject to the size limitations shown.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

General Information

• Status: Historical
• Publication Date: 31-Oct-2015
• ICS: 77.140.60 - Steel bars and rods
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.15 - Bars

Relations

• Replaces: ASTM A434-06(2012) - Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered
• Effective Date: 01-Nov-2015
• Replaced By: ASTM A434/A434M-17 - Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered
• Effective Date: 15-Mar-2017
• Referred By: ASTM A29/A29M-23 - Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
• Effective Date: 01-Nov-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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/A434M −15
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
1
and Tempered
This standard is issued under the fixed designationA434/A434M; 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 U.S. 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 Require-
limitations shown.
ments, if required, and
3.1.10 End use.
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
NOTE 1—A typical ordering description is as follows: 10000 lb,
each system may not be exact equivalents; therefore, each
Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter × 10 ft,
system shall be used independently of the other. Combining
ASTM A434 dated ____, Grade 4140, Class BB, Test Report Required,
Motor Shafts.
values from the two systems may result in non-conformance
with the standard.
4. Materials and Manufacture
2. Referenced Documents
4.1 Melting Practice—The steel shall be made by one or
2
2.1 ASTM Standards:
more of the following primary processes: open-hearth, basic-
A29/A29MSpecificationforGeneralRequirementsforSteel
oxygen, or electric-furnace. The primary melting may incor-
Bars, Carbon and Alloy, Hot-Wrought
porate separate degassing or refining and may be followed by
A108Specification for Steel Bar, Carbon and Alloy, Cold-
secondary melting using electroslag remelting or vacuum arc
Finished
remelting. Where secondary melting is employed, the heat
A370Test Methods and Definitions for Mechanical Testing
shall be defined as all of the ingots remelted from a single
of Steel Products
primary heat.
E112Test Methods for Determining Average Grain Size
4.2 Discard—Sufficient discard shall be made to secure
freedom from injurious piping and undue segregation.
3. Ordering Information
4.3 Slow Cooling—Hot-wrought alloy bars shall, immedi-
3.1 Orders for material under this specification should
ately after rolling, be allowed to cool to a temperature below
include the following information:
thecriticalrangeundersuitableconditionstopreventinjuryby
3.1.1 Quantity (weight or number of pieces),
too rapid cooling.
3.1.2 Name of material (heat-treated alloy steel bars),
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:
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
1
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
Hot-wrought or hot-wrought descaled 9 ⁄2 in. [241.3 mm], max
1
A01.15 on Bars.
Cold-drawn ⁄8 to 4 in. [3.2 to 102 mm], incl
1
Current edition approved Nov. 1, 2015. Published November 2015. Originally Cold-drawn, ground, and polished ⁄8 to 4 in. [3.2 to 102 mm], incl
3
approved in 1959. Last previous edition approved in 2012 as A434–06(2012). Turned and polished ⁄4 to 9 in. [19.1 to 229 mm], incl
3
Turned, ground, and polished ⁄4 to 9 in. [19.1 to 229 mm], incl
DOI: 10.1520/A0434_A0434M-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.5 Heat Treatment:
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.5.1 Heat treatment shall include quenching and tempering
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. for all classes of material. The material shall be uniformly
*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

---------------------- Page: 1 ----------------------
A434/A434M−15
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.
Elongation
Re
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A434 − 06 (Reapproved 2012) A434/A434M − 15
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
1
and Tempered
This standard is issued under the fixed designation A434;A434/A434M; 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 U.S. Department of Defense.
1. Scope 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 either SI units or inch-pound units are to be regarded separately as standard. The values given in
parentheses are mathematical conversions to SI units that are provided for information only and are not considered stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A29/A29M Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
A108 Specification for Steel Bar, Carbon and Alloy, Cold-Finished
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
E112 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 for cold finishing, the cold-finished size should also be specified),
3.1.5 ASTM designation and date of issue,
3.1.6 Chemical composition grade (Section 5),
3.1.7 Strength class (Table 1),
3.1.8 Test report, if required (Section 11),
3.1.9 Supplementary Requirements or Special Requirements,Require-
ments, if required, and
3.1.10 End use.
NOTE 1—A typical ordering description is as follows: 10 00010 000 lb, Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter × 10 ft, ASTM
A434 dated ____, Grade 4140, Class BB, Test Report Required, Motor Shafts.
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 March 1, 2012Nov. 1, 2015. Published April 2012November 2015. Originally approved in 1959. Last previous edition approved in 20062012
as A434 – 06.A434 – 06(2012). DOI: 10.1520/A0434-06R12.10.1520/A0434_A0434M-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A434/A434M − 15
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.
Elongation
Tensile Strength, Reduction SAE or AISI Repre-
Yield Strength, min, in 2 in. or
Class Diameter, in. (mm)[mm] min, ksi of Area, sentative
A
ksi (MPa)[MPa] 50 mm,
B
(MPa)[MPa] min, % Grade Types
min, %
1
1 ⁄2 (38.1) and under 90 (620) 110 (760) 20 50 3100, 4100,
1
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
1 1
Over 1 ⁄2 to 2 ⁄2 [38.1 to 63.5], incl 80 [550] 105 [720] 20 50 8600, 8700
6
C
1
BB Over 2 ⁄2 to 4 (63.5 to 114), incl 75 (520) 100 (690) 20 50
6
C
1
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 4 to 7 [114 to 178], incl 75 [520] 95 [660] 20 50
1
Over 7 to 9 ⁄2 (178 to 241.3), incl 65 (450) 90 (620) 18 40
Over 7 to 10 [178 to 254], incl 65 [450] 90
...