ASTM A729/A729M-06

Standard Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service

ABSTRACT
This specification deals with the standard requirements for heat-treated alloy steel axles and solid design roller bearing axles with machined bodies for mass transit and commuter cars in electric and locomotive hauled railway service. Various axle designs are used for this service including motor and non-motor with either inboard or outboard journals. Materials shall be forged, cooled and heat treated by normalizing, liquid quenching, tempering, and straightening. Steels shall conform to chemical composition requirements specified for each of the seven classes considered here. Conformance to mechanical property requirements such as tensile strength, yield strength, elongation, and reduction of area, shall be evaluated by tensile tests. Details of nondestructive ultrasonic and magnetic particle examination procedures are discussed thoroughly. Final axle products shall conform to purchaser-specified size, shape, and finish. Rough machining shall be free of excessively rough ridges and coarse chatter marks, and the finish machined axle surfaces shall be free of injurious imperfections.
SCOPE
1.1 This specification covers heat-treated alloy steel axles for mass transit and commuter cars in electric and locomotive hauled railway service.
1.2 This specification is for solid design roller bearing axles with machined bodies.
1.3 Various axle designs are used for this service including motor and non-motor with either inboard or outboard journals.
1.4 Supplementary requirements including those in the general requirements of Specification A 788/A 788M are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.5 Unless the order specifies the applicable "M" specification designation, the axles shall be furnished to the inch-pound units.
1.6 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text and tables, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 31-Aug-2006
• ICS: 45.040 - Materials and components for railway engineering
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaces: ASTM A729/A729M-05a - Standard Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service
• Effective Date: 01-Sep-2006
• Replaced By: ASTM A729/A729M-09 - Standard Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service
• Effective Date: 01-Apr-2009
• Referred By: ASTM A788/A788M-23 - Standard Specification for Steel Forgings, General Requirements
• Effective Date: 01-Sep-2006

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: A 729/A 729M – 06
Standard Specification for
Alloy Steel Axles, Heat-Treated, for Mass Transit and
1
Electric Railway Service
This standard is issued under the fixed designationA 729/A 729M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* A 388/A 388M Practice for Ultrasonic Examination of
Heavy Steel Forgings
1.1 This specification covers heat-treated alloy steel axles
A 788/A 788M Specification for Steel Forgings, General
for mass transit and commuter cars in electric and locomotive
Requirements
hauled railway service.
E112 Test Methods for Determining Average Grain Size
1.2 This specification is for solid design roller bearing axles
E 381 Method of Macroetch Testing Steel Bars, Billets,
with machined bodies.
Blooms, and Forgings
1.3 Various axle designs are used for this service including
E 1426 Test Method for Determining the Effective Elastic
motor and non-motor with either inboard or outboard journals.
Parameter for X-Ray Diffraction Measurements of Re-
1.4 Supplementary requirements including those in the gen-
sidual Stress
eral requirements of SpecificationA 788/A 788M are provided
for use when additional testing or inspection is desired. These
3. Ordering Information
shall apply only when specified individually by the purchaser
3.1 Material supplied to this specification shall conform to
in the order.
the requirements of Specification A 788/A 788M, which out-
1.5 Unless the order specifies the applicable “M” specifica-
lines ordering information, manufacturing requirements, test-
tion designation, the axles shall be furnished to the inch-pound
ing and retesting methods and procedures, marking, certifica-
units.
tion, product analysis variations, and additional supplementary
1.6 The values stated in either inch-pound or SI (metric)
requirements.
units are to be regarded separately as standard. Within the text
3.1.1 If the requirements of this specification are in conflict
andtables,theSIunitsareshowninbrackets.Thevaluesstated
with the requirements of SpecificationA 788/A 788M, then the
in each system are not exact equivalents; therefore, each
requirements of this specification shall prevail.
system shall be used independently of the other. Combining
3.2 In addition to the ordering information required by
values from the two systems may result in nonconformance
Specification A 788/A 788M, the purchaser should include
with the specification.
with the inquiry and order a detailed drawing, sketch or written
2. Referenced Documents description of the axle showing complete details pertaining to
2 dimensions, tolerances if more restrictive than those contained
2.1 ASTM Standards:
in this specification, degree of finish, and location of stamping.
A 29/A 29M SpecificationforSteelBars,CarbonandAlloy,
3.2.1 Unlessthepurchaserdesignatesaclassinthepurchase
Hot-Wrought, General Requirements for
order or contract, the class used shall be at the producer’s
A 275/A 275M Test Method for Magnetic Particle Exami-
discretion.
nation of Steel Forgings
3.3 Supplementary requirements, if needed, including any
that are appropriate from Specification A 788/A 788M.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, 4. Chemical Requirements
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4.1 Chemical Composition—The steel shall conform to the
A01.06 on Steel Forgings and Billets.
chemical requirements specified in Table 1.
Current edition approved Sept. 1, 2006. Published September 2006. Originally
approved in 1976. Last previous edition approved in 2005 asA 729/A 729M – 05a.
4.2 Seven classes of steel are included in Table 1. Unless
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
otherwisespecifiedbythepurchaser,thechoiceofsteelclassto
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
be used for any given axle grade is at the option of the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. producer.
*A Summary of Changes section appears at the end of this standard.
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A 729/A 729M – 06
TABLE 1 Chemical Requirements
Composition %
A
Class A Class B Class C Class D Class F ClassesG&H
Carbon 0.43-0.48 0.28-0.33 0.38-0.43 0.28-0.33 0.45-0.59 .
Manganese 0.75-1.00 0.40-0.60 0.75-1.00 0.70 0.90 0.60-0.90 0.60-0.90
Phosphorous 0.035 max 0.035 max 0.035 max 0.035 max 0.035 max 0.035 max
Sulfur 0
...