ASTM A532/A532M-93a(2003)

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Designation: A 532/A 532M – 93a (Reapproved 2003)
Standard Specification for
Abrasion-Resistant Cast Irons
This standard is issued under the fixed designationA532/A532M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.1.1 Quantity,
3.1.2 Specification number, class, and type,
1.1 This specification covers a group of white cast irons that
3.1.3 Descriptionofthecasting,patternnumber,ordrawing,
have been alloyed to secure high resistance to abrasive wear in
3.1.4 Chilling of the casting, if required (see 4.2),
the applications of the mining, milling, earth-handling, and
3.1.5 Heat treat condition (see 5.1),
manufacturing industries.
3.1.6 Hardness level, if supplied hardened or hardened and
1.2 Simple and low-alloy white cast irons that consist
stress relieved, and
essentially of iron carbides and pearlite are specifically ex-
3.1.7 Hardness method, Brinell, Rockwell, Vickers (see
cluded from this specification.
Section 9). If the hardness method is not specified, it shall be
1.3 The values stated in inch-pound units or SI units are to
at the manufacturer’s option.
be regarded separately as the standard.Within the text, SI units
are shown in brackets.The values stated in each system are not
4. Method of Manufacture
exact equivalents; therefore, each system must be used inde-
4.1 These alloys may be made by any suitable melting
pendentlyoftheother.Combiningvaluesfromthetwosystems
process.
may result in nonconformance with the specification.
4.2 If the casting is to be chilled or otherwise specially
2. Referenced Documents treated on any portion, the inquiries and the purchase order
shallsostateandaproperlymarkeddrawingofthecastingwill
2.1 ASTM Standards:
accompany both the inquiry and the purchase order.
E10 Test Method for Brinell Hardness of Metallic Materi-
als
5. Heat Treatment
E18 Test Methods for Rockwell Hardness and Rockwell
5.1 The casting will be supplied in one of the following
Superficial Hardness of Metallic Materials
conditions:
E92 Test Method for Vickers Hardness of Metallic Mate-
5.1.1 As-cast,
rials
5.1.2 As-cast and stress relieved,
E 350 Test Methods for ChemicalAnalysis of Carbon Steel,
5.1.3 Hardened,
Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and
5.1.4 Hardened and stress relieved, or
Wrought Iron
5.1.5 Softened for machining.
E 351 Test Methods for Chemical Analysis of Cast Iron—
5.2 Unless otherwise specified by the purchaser, the manu-
All Types
facturer shall supply the castings in the heat treatment he
3. Ordering Information deems best for the application.
5.3 If the heat treatment specified for delivered condition is
3.1 Orders for material in this specification should include
not that of final use, it shall be the responsibility of the
the following information:
purchaser to provide the additional heat treatment.
5.4 ClassIIandClassIIIalloysarefrequentlyorderedinthe
This specification is under the jurisdiction of ASTM Committee A04 on Iron
annealedconditionwithamaximumhardnessof400HB.After
CastingsandisthedirectresponsibilityofSubcommitteeA04.01onGreyandWhite
machining operations are performed the castings may then be
Iron Castings.
hardened. If both annealing and machining are to be performed
Current edition approved Dec. 1, 2003. Published December 2003. Originally
e1
approved in 1965. Last previous edition approved in 1999 as A 532–93a (1999) .
by the manufacturer, as specified in the inquiry, contract, or
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
order, the purchaser may then specify delivery in the hardened
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
condition. If the purchaser specifies delivery in the annealed
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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A 532/A 532M – 93a (2003)
condition, subsequent hardening (and stress-relief, if it is 6.3.2 The following is in accordance with Test Methods
desired) is the responsibility of the purchaser. E 350:
6.3.2.1 Molybdenum by the Photometric Method.
6. Chemical Composition
7. Microstructure
6.1 The composition of the metal of a class and type
7.1 The alloys covered by this specification are expected to
produced under this specification shall fall within the ranges
have microstructures that consist essentially of carbides, mar-
prescribed in Table 1 for that class and type.
tensite, bainite, austenite; and in exceptional cases minor
6.2 Spectrographic, X-ray, or wet chemical laboratory tech-
amounts of graphite or pearlite.
niques are acceptable for routine and control determinations,
7.2
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