ASTM A729/A729M-05a
(Specification)Standard Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service
Standard Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service
SCOPE
1.1 This specification covers quenched and tempered alloy steel axles for mass transit and commuter cars in electric 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 nonmotor with either inboard or outboard journals.
1.4 Supplementary requirements 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 The values stated in inch-pound units are to be regarded as the standard.
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Standards Content (Sample)
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Designation: A 729/A 729M – 05a
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 Specification for Steel Forgings, General Require-
for mass transit and commuter cars in electric and locomotive
ments
hauled railway service.
E112 Test Methods for Determining the Average Grain
1.2 This specification is for solid design roller bearing axles
Size
with machined bodies.
E 381 Method of Macroetch Testing Steel Bars, Billets,
1.3 Various axle designs are used for this service including
Blooms, and Forgings
motor and non-motor with either inboard or outboard journals.
E 1426 Test Method for Determining the Effective Elastic
1.4 Supplementary requirements including those in the gen-
Parameter for X-Ray Diffraction Measurements of Re-
eral requirements of Specification A 788 are provided for use
sidual Stress
when additional testing or inspection is desired. These shall
apply only when specified individually by the purchaser in the
3. Ordering Information
order.
3.1 Material supplied to this specification shall conform to
1.5 The values stated in either inch-pound or SI (metric)
the requirements of SpecificationA 788. which outlines order-
units are to be regarded separately as standard. Within the text
ing information, manufacturing requirements, testing and re-
andtables,theSIunitsareshowninbrackets.Thevaluesstated
testingmethodsandprocedures,marking,certification,product
in each system are not exact equivalents; therefore, each
analysis variations, and additional supplementary require-
system must be used independent of the other. Combining
ments.
values from the two systems may result in nonconformance
3.1.1 If the requirements of this specification are in conflict
with the specification.
with the requirements of SpecificationA 788. then the require-
1.6 Unless the order specifies the applicable “M” specifica-
ments of this specification shall prevail.
tion designation, the axles shall be furnished to the inch-pound
3.2 In addition to the ordering information required by
units.
Specification A 788, the purchaser should include with the
2. Referenced Documents inquiry and order a detailed drawing, sketch or written descrip-
2 tion of the axle showing complete details pertaining to dimen-
2.1 ASTM Standards:
sions, tolerances if more restrictive than those contained in this
A 29/A 29M SpecificationforSteelBars,CarbonandAlloy,
specification, degree of finish, and location of stamping.
Hot-Wrought and Cold-Finished, General Requirements
3.3 Supplementary requirements, if needed, including any
for
that are appropriate from Specification A 788.
A 275/A 275M Test Method for Magnetic Particle Exami-
nation of Steel Forgings
4. Chemical Requirements
4.1 Chemical Composition—The steel shall conform to the
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, chemical requirements specified in Table 1.
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
4.2 Seven classes of steel are included in Table 1. Unless
A01.06 on Steel Forgings and Billets.
otherwisespecifiedbythepurchaser,thechoiceofsteelclassto
Current edition approved Nov. 1, 2005. Published November 2005. Originally
be used for any given axle grade is at the option of the
approved in 1976. Last previous edition approved in 2005 as A 729 – 05.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
producer.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.3 Unspecified element additions to Classes F, G, and H
Standards volume information, refer to the standard’s Document Summary page on
shall be reported.
the ASTM website.
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A 729/A 729M – 05a
TABLE 1 Chemical Requirements
Composition %
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 0.35 max 0.035 max
Sulfur 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max
Silicon 0.15-0.35 0.15-0.35 0.15-0.35 0.15-0.35 0.15 min 0.15 min
AA
Nickel 0.40-0.70
AA
Chromiu
...
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