ASTM A49-12
(Specification)Standard Specification for Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint Bars, and Forged Carbon Steel Compromise Joint Bars
Standard Specification for Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint Bars, and Forged Carbon Steel Compromise Joint Bars
ABSTRACT
This specification covers heat-treated carbon steel joint bars, microalloyed joint bars, and forged compromise joint bars to be used in standard railroad track and production of insulated joints. Manufacturing of the steel shall be done either by basic-oxygen process, electric-furnace process, or both. The chemical composition of the steel joint bars shall be within the limits specified for carbon, manganese, phosphorus, and sulfur. Requirements for heat or cast analysis, product analysis, and tensile testing are detailed. Specifications for the material tensile properties such as tensile strength, yield point, yield strength, and elongation are given.
SCOPE
1.1 This specification covers heat-treated carbon steel joint bars, microalloyed joint bars, and forged compromise joint bars for general use in standard railroad track.
1.2 The joint bars may be used for the production of insulated joints.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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Designation:A49 −12
Standard Specification for
Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint
1
Bars, and Forged Carbon Steel Compromise Joint Bars
This standard is issued under the fixed designationA49; 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.Asuperscript
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 Punching—type (elliptical, oval, round, or
combinations), size, number, location, spacing and elevation of
1.1 This specification covers heat-treated carbon steel joint
punched holes, with dimensional drawing if necessary,
bars,microalloyedjointbars,andforgedcompromisejointbars
3.1.5 Head Easement—if required, and
for general use in standard railroad track.
3.1.6 Certification and Test Report Requirements (see 12.1).
1.2 The joint bars may be used for the production of
insulated joints.
4. Manufacture
1.3 The values stated in inch-pound units are to be regarded
4.1 The steel shall be made by one or both of the following
as the standard. The values given in parentheses are for
processes: basic-oxygen or electric-furnace.
information only.
4.1.1 The steel may be cast by a continuous process, or in
ingots.
2. Referenced Documents
2
4.2 Heating and Quenching—Quenched carbon-steel joint
2.1 ASTM Standards:
bars and forged compromise joint bars shall be uniformly
A29/A29M Specification for Steel Bars, Carbon and Alloy,
heated for punching, slotting, shaping, and forging and subse-
Hot-Wrought, General Requirements for
quently quenched. Maximum depth of decarburized layer of
A370 Test Methods and Definitions for Mechanical Testing
forged bars shall not exceed 0.040 in.
of Steel Products
A700 Practices for Packaging, Marking, and Loading Meth-
4.3 Microalloyed joint bars shall be produced from hot
ods for Steel Products for Shipment
rolled steel sections. Bars shall be sheared or sawed cold, and
holes shall be drilled. No reheating and quenching is required.
2.2 American Railway Engineering and Maintenance of
3
Way Association Manual for Railway Engineering
5. Chemical Requirements
3. Ordering Information
5.1 The chemical composition of the quenched carbon-steel
joint bars and forged compromise joint bars determined as
3.1 Orders for joint bars under this specification shall
prescribed in 5.3 shall be within the limits shown in Table 1.
include the following information as appropriate:
3.1.1 Quantity—number of pairs of bars,
5.2 Thechemicalcompositionofthemicroalloyedjointbars
3.1.2 Type—design or type bar along with section designa-
shall be agreed upon by the purchaser and the manufacturer.
tion and weight of rails being joined,
Microalloying shall be accomplished with columbium,
3.1.3 Dimension—overall length,
vanadium, and nitrogen, or combinations thereof.
5.3 Heat or Cast Analysis—Separate analysis shall be made
from test samples representing one of the first three and one of
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
the last three ingots or continuously cast blooms preferably
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.01 on Steel Rails and Accessories.
taken during the pouring of the heat. Determinations may be
Current edition approved March 1, 2012. Published April 2012. Originally
made chemically or spectrographically.Any portion of the heat
approved in 1915. Last previous edition approved in 2006 as A49 – 01 (2006). DOI:
meeting the chemical analysis requirements of Table 1 may be
10.1520/A0049-12.
2
applied. The first heat analysis shall be recorded as the official
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
heat analysis, but the purchaser shall have access to all ladle
Standards volume information, refer to the standard’s Document Summary page on
analyses.Additionally, any material meeting the product analy-
the ASTM website.
3
sis limits shown in Table 2 may be applied after testing such
Available fromAmerican Railway Engineering and Maintenance ofWayAssn.,
10003 Derekwood Lane, Suite 210, Lanham, MD 20706. material in accordance with Specification A29/A29M.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A49−12
TABLE 1 Chemical Requirements
a standard round tension test specimen with 2-in., or 50-mm
Element Composition, % gage length as described in Test Methods and Definitions
Carbon 0.35–0.60 A370.
Manganese, max 1.20
6.3 Number of Tests—One ten
...
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:A49–01 (Reapproved 2006) Designation: A49 – 12
Standard Specification for
Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint
1
Bars, and Forged Carbon Steel Compromise Joint Bars
This standard is issued under the fixed designationA49; 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.Asuperscript
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
1.1 This specification covers heat-treated carbon steel joint bars, microalloyed joint bars, and forged compromise joint bars for
general use in standard railroad track.
1.2 The joint bars may be used for the production of insulated joints.
1.3 The values stated in inch-pound units are to be regarded as the standard.The values given in parentheses are for information
only.
2. Referenced Documents
2
2.1 ASTM Standards:
A29/A29M Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment
3
2.2 American Railway Engineering and Maintenance of Way Association Manual for Railway Engineering
3. Ordering Information
3.1 Orders for joint bars under this specification shall include the following information as appropriate:
3.1.1 Quantity—number of pairs of bars,
3.1.2 Type—design or type bar along with section designation and weight of rails being joined,
3.1.3 Dimension—overall length,
3.1.4 Punching—type (elliptical, oval, round, or combinations), size, number, location, spacing and elevation of punched holes,
with dimensional drawing if necessary,
3.1.5 Head Easement—if required, and
3.1.6 Certification and Test Report Requirements (see 11.112.1).
4. Manufacture
4.1 The steel shall be made by one or both of the following processes: basic-oxygen or electric-furnace.
4.1.1 The steel may be cast by a continuous process, or in ingots.
4.2 Heating and Quenching—Quenched carbon-steel joint bars and forged compromise joint bars shall be uniformly heated for
punching, slotting, shaping, and forging and subsequently quenched. Maximum depth of decarburized layer of forged bars shall
not exceed 0.040 in.
4.3 Microalloyedjointbarsshallbeproducedfromhotrolledsteelsections.Barsshallbeshearedorsawedcold,andholesshall
be drilled. No reheating and quenching is required.
5. Chemical Requirements
5.1 The chemical composition of the quenched carbon-steel joint bars and forged compromise joint bars determined as
prescribed in 5.3 shall be within the limits shown in Table 1.
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys,Alloys and is the direct responsibility of Subcommittee
A01.01 on Steel Rails and Accessories.
Current edition approved March 1, 2006.2012. Published March 2006.April 2012. Originally approved in 1915. Last previous edition approved in 20012006 as
A49 – 01 (2006). DOI: 10.1520/A0049-01R06.10.1520/A0049-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
3
Available from American Railway Engineering and Maintenance of Way Assn., 10003 Derekwood Lane, Suite 210, Lanham, MD 20706.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
A49–12
TABLE 1 Chemical Requirements
Element Composition, %
Carbon 0.35–0.60
Manganese, max 1.20
Phosphorus, max 0.04
Sulfur, max 0.050
5.2 The chemical composition of the microalloyed joint bars shall be agreed upon by the purchaser and the manufacturer.
Microalloying shall be accomplished with columbium, vanadium, and nitrogen, or combinations thereof.
5.3 Heat or Cast Analysis—Separate analysis shall be made from test samples representing one of the first three and one of the
last three ingots or continuously cast blooms preferably taken during the pouring of the heat. Determinations may be made
chemically or spectrographically.Any portion of the heat meeting the chemical analysis requirements of Table 1 may be applied.
The first heat analysis shall be recorded as the offi
...
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