ASTM A49-01(2006)

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.

General Information

• Status: Historical
• Publication Date: 28-Feb-2006
• 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

• Replaces: ASTM A49-01 - Standard Specification for Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint Bars, and Forged Carbon Steel Compromise Joint Bars
• Effective Date: 01-Mar-2006
• Replaced By: ASTM A49-12 - Standard Specification for Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint Bars, and Forged Carbon Steel Compromise Joint Bars
• Effective Date: 01-Mar-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A49 – 01 (Reapproved 2006)
Standard Specification for
Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint
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 3.1.2 Type—design or type bar along with section designa-
tion and weight of rails being joined,
1.1 This specification covers heat-treated carbon steel joint
3.1.3 Dimension—overall length,
bars,microalloyedjointbars,andforgedcompromisejointbars
3.1.4 Punching—type (elliptical, oval, round, or combina-
for general use in standard railroad track.
tions), size, number, location, spacing and elevation of
1.2 The joint bars may be used for the production of
punched holes, with dimensional drawing if necessary,
insulated joints.
3.1.5 Head Easement—if required, and
1.3 The values stated in inch-pound units are to be regarded
3.1.6 Certification and Test Report Requirements (see
as the standard. The values given in parentheses are for
11.1).
information only.
4. Manufacture
2. Referenced Documents
4.1 The steel shall be made by one or both of the following
2.1 ASTM Standards:
processes: basic-oxygen or electric-furnace.
A29/A29M Specification for Steel Bars, Carbon and Alloy,
4.1.1 The steel may be cast by a continuous process, or in
Hot-Wrought, General Requirements for
ingots.
A370 Test Methods and Definitions for Mechanical Testing
4.2 Heating and Quenching—Quenched carbon-steel joint
of Steel Products
bars and forged compromise joint bars shall be uniformly
A700 PracticesforPackaging,Marking,andLoadingMeth-
heated for punching, slotting, shaping, and forging and subse-
ods for Steel Products for Shipment
quently quenched. Maximum depth of decarburized layer of
2.2 American Railway Engineering and Maintenance of
3 forged bars shall not exceed 0.040 in.
Way Association Manual for Railway Engineering
4.3 Microalloyed joint bars shall be produced from hot
rolled steel sections. Bars shall be sheared or sawed cold, and
3. Ordering Information
holes shall be drilled. No reheating and quenching is required.
3.1 Orders for joint bars under this specification shall
5. Chemical Requirements
include the following information as appropriate:
5.1 The chemical composition of the quenched carbon-steel
3.1.1 Quantity—number of pairs of bars,
joint bars and forged compromise joint bars determined as
prescribed in 5.3 shall be within the limits shown in Table 1.
5.2 Thechemicalcompositionofthemicroalloyedjointbars
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
shall be agreed upon by the purchaser and the manufacturer.
Stainless Steel and RelatedAlloys, and is the direct responsibility of Subcommittee
A01.01 on Steel Rails and Accessories. Microalloying shall be accomplished with columbium, vana-
Current edition approved March 1, 2006. Published March 2006. Originally
dium, and nitrogen, or combinations thereof.
approved in 1915. Last previous edition approved in 2001 as A49 – 01. DOI:
5.3 Heat or Cast Analysis—Separate analysis shall be made
10.1520/A0049-01R06.
from test samples representing one of the first three and one of
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
the last three ingots or continuously cast blooms preferably
Standards volume information, refer to the standard’s Document Summary page on
taken during the pouring of the heat. Determinations may be
the ASTM website.
3 made chemically or spectrographically.Any portion of the heat
Available fromAmerican Railway Engineering and Maintenance ofWayAssn.,
10003 Derekwood Lane, Suite 210, Lanham, MD 20706. meeting the chemical analysis requirements of Table 1 may be
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A49 – 01 (2006)
TABLE 1 Chemical Requirements TABLE 3 Tensile Requirements
Element Composition, %
ksi MPa
Carbon 0.35–0.60
Tensile strength, min 100 690
Manganese, max 1.20
Yield point or yield strength, 70 485
Phosphorus, max 0.04
A
minimum
Sulfur, max 0.050
Elongation in 2 in. or 50 mm, min, 12
%
Reduction in area, min, % 25
A
Determination by either the 0.2 % offset method or the 0.5 % extension-under-
applied. The first heat analysis shall be recorded as the official
load method.
heat analysis, but the purchaser shall have access to all ladle
analyses.Additionally,anymaterialmeetingtheproductanaly-
sis limits shown in Table 2 may be applied after testing such quenched. For microalloyed bars, one tension test shall be
material in accordance with Specification A29/A29M. made from each heat or cast.
5.4 Product Analysis—When ladle tests are not available, 6.4 Retests:
finished material representing the heat may be product tested. 6.4.1 If the results of the tension test of any test lot for
The product analysis allowance beyond the limits of the quenched bars do not conform to the specified requirements,
specified ladle analysis shall be within the limits for product the manufacturer may retreat such lot not more than twice, in
analyses specified in Table 2. which case two additional tension tests shall be made from
5.4.1 An analysis may be made by the purchaser from a such lot, and both shall conform to the requirements specified
sampletakenfromafinishedjointbarrepresentingeachheator in Table 3.
cast. The chemical composition thus determined shall conform 6.4.2 If the results of the tension test for microalloyed bars
to the requirements in Table 2. do not conform to the specified requirements, a retest may be
made on two random samples from the heat or cast, and both
6. Tensile Requirements
shall conform to the requirements specified in Table 3.
6.4.3 If any test specimen fails because of mechanical
6.1 Properties:
reasons such as failure of testing equipment or improper
6.1.1 The material as represented by a tension test specimen
specimen preparation, it may be discarded and another speci-
shall conform to the tensile properties prescribed in Table 3.
men taken.
6.1.2 The yield point prescribed in Table 3 may be deter-
mined by the drop of the beam or halt of the gage of the testing
7.
...