ASTM A434/A434M-18
(Specification)Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered
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.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Buy Standard
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A434/A434M −18
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. Ordering Information
1.1 This specification covers hot-wrought and cold-finished 3.1 Orders for material under this specification should
quenched and tempered alloy steel bars. include the following information:
3.1.1 Quantity (weight or number of pieces),
1.2 Hot-wrought bars are available in three strength level
3.1.2 Name of material (heat-treated alloy steel bars),
classes designated BB, BC, and BD, and cold-finished bars in
3.1.3 Method of finish (condition) (4.4),
two strength level classes designated BB and BC.The bars are
available in the conditions specified in 4.4 subject to the size
3.1.4 Dimensions, including length (if hot-wrought bars are
limitations shown.
for cold finishing, the cold-finished size should also be
specified),
1.3 The values stated in either SI units or inch-pound units
3.1.5 ASTM designation and date of issue,
are to be regarded separately as standard. The values stated in
3.1.6 Chemical composition grade (Section 5),
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining 3.1.7 Strength class (Table 1),
values from the two systems may result in non-conformance
3.1.8 Test report, if required (Section 11),
with the standard.
3.1.9 Supplementary Requirements or Special Require-
ments, if required, and
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- 3.1.10 End use.
ization established in the Decision on Principles for the
NOTE 1—A typical ordering description is as follows: 10000 lb,
Development of International Standards, Guides and Recom-
Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter × 10 ft,
mendations issued by the World Trade Organization Technical
ASTM A434 dated ____, Grade 4140, Class BB, Test Report Required,
Barriers to Trade (TBT) Committee. Motor Shafts.
2. Referenced Documents 4. Materials and Manufacture
2
2.1 ASTM Standards: 4.1 Melting Practice—The steel shall be made by any
A29/A29MSpecificationforGeneralRequirementsforSteel commercially viable primary steelmaking process. The pri-
Bars, Carbon and Alloy, Hot-Wrought mary melting may incorporate separate degassing or refining
A108Specification for Steel Bar, Carbon and Alloy, Cold- and may be followed by secondary melting using electroslag
Finished remelting or vacuum arc remelting. Where secondary melting
A370Test Methods and Definitions for Mechanical Testing is employed, the heat shall be defined as all of the ingots
of Steel Products remelted from a single primary heat.
4.2 Discard—Sufficient discard shall be made to secure
freedom from injurious piping and undue segregation.
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
4.3 Slow Cooling—Hot-wrought alloy bars shall, immedi-
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.15 on Bars. ately after rolling, be allowed to cool to a temperature below
CurrenteditionapprovedJuly1,2018.PublishedJuly2018.Originallyapproved
thecriticalrangeundersuitableconditionstopreventinjuryby
in 1959. Last previous edition approved in 2017 as A434/A434M–17. DOI:
too rapid cooling.
10.1520/A0434_A0434M–18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.4 Condition—Barsshallbefurnishedinoneofthefollow-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ing conditions, as specified by the purchaser. Generally, size
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. limits for various methods of processing round bars are:
*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−18
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 in Reduction SAE or AISI
Yield Strength, min, Tensile Strength,
Clas
...
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/A434M − 17 A434/A434M − 18
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
1
and Tempered
This standard is issued under the fixed designation 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*
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.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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 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 × 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 15, 2017July 1, 2018. Published March 2017July 2018. Originally approved in 1959. Last previous edition approved in 20152017 as
A434/A434M – 15.A434/A434M–17. DOI: 10.1520/A0434_A0434M-17.10.1520/A0434_A0434M–18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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 − 18
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 in Reduction SAE or AISI
Yield Strength, min, Tensile Strength,
Class Diameter, in. [mm] 2 in. or 50 of Area, Representative
A
ksi [MPa] min, ksi [MPa]
B
mm, min, % min, % Grade Types
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
C
1
BB Over 2 ⁄2 to 4 [63.5 to 102], incl 75 [520] 100 [690] 20 50
Over 4 to 7 [102 to 178], incl 75 [520] 95 [660] 20 50
6
Over 7 to 10 [178 to 254], incl 65 [450] 90 [620] 18 40
1
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
1
BC Over 2 ⁄2 t
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.