ASTM A942-95(2007)
(Specification)Standard Specification for Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-Resistant Roll Shells
Standard Specification for Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-Resistant Roll Shells
ABSTRACT
This specification covers double pour, centrifugally cast, abrasion-resistant roll shells for general application. The outer layer is white iron and the inner layer is gray iron and there shall be no gradient of mottled iron these layers. Both the white and the gray irons may be melted by any suitable melting process. The white iron portion of the casting shall be produced by chemistry rather than chilling. A chemical analysis of the white and gray irons shall be taken and the chemical compositions shall be controlled to obtain the required mechanical properties. The white iron (Types I, II, III, and IV) shall conform to the specified Brinell hardness and the gray iron (Class Nos. 20, 25, 30, and 35) shall conform to the specified tensile strength. The minimum thickness of the white iron layer is given. Hardness and tension tests of the cast dual metal shall be performed.
SCOPE
1.1 This specification covers double pour, centrifugally cast, abrasion-resistant roll shells for general application. The outer layer is white iron and the inner layer is gray iron. There shall be no gradient of mottled iron between the white iron and the gray iron.
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
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Designation:A942 −95(Reapproved 2007)
Standard Specification for
Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-
Resistant Roll Shells
This standard is issued under the fixed designation A942; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.3 Required dimensions and thickness of white iron layer
(8.1),
1.1 Thisspecificationcoversdoublepour,centrifugallycast,
4.1.4 Surface condition—as cast or machined,
abrasion-resistant roll shells for general application. The outer
4.1.5 Type of white iron required for the outer layer of the
layer is white iron and the inner layer is gray iron. There shall
casting (7.1),
be no gradient of mottled iron between the white iron and the
4.1.6 Class of gray iron required for the inner layer (7.2),
gray iron.
4.1.7 Certification, if required (Section 13), and
1.2 The values stated in either inch-pound units or SI units
4.1.8 Special position of marking information, if required
are to be regarded separately as standard. Within the text, the
(Section 14).
SI units are shown in brackets. The values stated in each
4.2 Additional requirements may be agreed upon between
system are not exact equivalents; therefore, each system must
the manufacturer and the purchaser.
be used independently of the other. Combining values from the
two systems may result in nonconformance with this specifi-
5. Materials and Manufacture
cation.
5.1 Both the white and the gray irons may be melted by any
suitable melting process.
2. Referenced Documents
2.1 ASTM Standards: 5.2 The white iron portion of the casting shall be produced
by chemistry rather than chilling.
A48/A48M Specification for Gray Iron Castings
E8 Test Methods for Tension Testing of Metallic Materials
6. Chemical Composition
E10 Test Method for Brinell Hardness of Metallic Materials
6.1 A chemical analysis shall be performed by the manu-
3. Classification
facturer on both the white and gray irons. The chemical
compositions shall be controlled to obtain the required me-
3.1 The white iron portion of the casting shall be classified
chanical properties.
by type based upon Brinell Hardness.
3.2 Thegrayironportionofthecastingshallbeclassifiedby
7. Mechanical Properties
class based upon tensile strength.
7.1 The white iron shall conform to the following require-
ments:
4. Ordering Information
Type I — 450 to 500 HB
4.1 Orders for material to this specification shall include the
Type II — 500 to 550 HB
following:
Type III — 550 to 600 HB
Type IV — 600 to 650 HB
4.1.1 Specification title, designation, and year of issue,
4.1.2 Quantity of castings required,
7.2 The gray iron shall conform to the following require-
ments:
Tensile Strength
This specification is under the jurisdiction of ASTM Committee A04 on Iron Class min, ksi min, (MPa)
CastingsandisthedirectresponsibilityofSubcommitteeA04.01onGreyandWhite No. 20 20 (138)
No. 25 25 (172)
Iron Castings.
No. 30 30 (207)
Current edition approved June 15, 2007. Published July 2007. Originally
No. 35 35 (241)
approved in 1995. Last previous edition approved in 2001 as A942 – 95 (2001).
DOI: 10.1520/A0942-95R07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 8. Other Requirements
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
8.1 The thickness of the white iron layer shall be a mini-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. mum of ⁄2 in.
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A942−95 (2007)
8.1.1 The thickness of the white iron layer shall be mea- 11.2 T
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