ASTM A49-12(2019)

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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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

• Status: Published
• Publication Date: 28-Feb-2019
• ICS: 77.140.60 - Steel bars and rods
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.01 - Steel Rails and Accessories

Relations

• Refers: ASTM A29/A29M-15 - Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
• Effective Date: 01-Nov-2015
• Refers: ASTM A370-15 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Nov-2015
• Refers: ASTM A370-17 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Jan-2017
• Refers: ASTM A370-17a - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Nov-2017
• Refers: ASTM A370-19 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Jul-2019
• Refers: ASTM A700-14(2019) - Standard Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
• Effective Date: 01-Nov-2019
• Refers: ASTM A700-14 - Standard Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
• Effective Date: 01-Nov-2014

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:A49 −12 (Reapproved 2019)
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 U.S. Department of Defense.
1. Scope 3. Ordering Information
1.1 This specification covers heat-treated carbon steel joint 3.1 Orders for joint bars under this specification shall
bars,microalloyedjointbars,andforgedcompromisejointbars include the following information as appropriate:
for general use in standard railroad track. 3.1.1 Quantity—number of pairs of bars,
3.1.2 Type—design or type bar along with section designa-
1.2 The joint bars may be used for the production of
tion and weight of rails being joined,
insulated joints.
3.1.3 Dimension—overall length,
1.3 The values stated in inch-pound units are to be regarded
3.1.4 Punching—type (elliptical, oval, round, or
as standard. The values given in parentheses are mathematical
combinations), size, number, location, spacing and elevation of
conversions to SI units that are provided for information only
punched holes, with dimensional drawing if necessary,
and are not considered standard.
3.1.5 Head Easement—if required, and
1.4 This international standard was developed in accor- 3.1.6 Certification and Test Report Requirements (see 12.1).
dance with internationally recognized principles on standard-
4. Manufacture
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 4.1 The steel shall be made by one or both of the following
mendations issued by the World Trade Organization Technical processes: basic-oxygen or electric-furnace.
Barriers to Trade (TBT) Committee. 4.1.1 The steel may be cast by a continuous process, or in
ingots.
2. Referenced Documents
4.2 Heating and Quenching—Quenched carbon-steel joint
2
2.1 ASTM Standards: bars and forged compromise joint bars shall be uniformly
A29/A29M SpecificationforGeneralRequirementsforSteel heated for punching, slotting, shaping, and forging and subse-
Bars, Carbon and Alloy, Hot-Wrought 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
4.3 Microalloyed joint bars shall be produced from hot
A700 Guide for Packaging, Marking, and Loading Methods
rolled steel sections. Bars shall be sheared or sawed cold, and
for Steel Products for Shipment
holes shall be drilled. No reheating and quenching is required.
3
2.2 AREMA Publications:
5. Chemical Requirements
AREMA Manual for Railway Engineering
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 of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
5.2 Thechemicalcompositionofthemicroalloyedjointbars
A01.01 on Steel Rails and Accessories.
shall be agreed upon by the purchaser and the manufacturer.
Current edition approved March 1, 2019. Published March 2019. Originally
Microalloying shall be accomplished with columbium,
approved in 1915. Last previous edition approved in 2012 as A49 – 12. DOI:
10.1520/A0049-12R19.
vanadium, and nitrogen, or combinations thereof.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 Heat or Cast Analysis—Separate analysis shall be made
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
from test samples representing one of the first three and one of
the ASTM website.
the last three ingots or continuously cast blooms preferably
3
Available from American Railway Engineering and Maintenance-of-Way
taken during the pouring of the heat. Determinations may be
Association (AREMA), 4501 Forbes Blvd., Suite 130, Lanham, MD 20706,
https://www.arema.org. made chemically or spectrographically.Any portion of the heat
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A49−12 (2019)
TABLE 1 Chemical Require
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