ASTM A942/A942M-95(2018)

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 SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.2.1 Within the text, the SI units are shown in brackets.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 31-Oct-2018
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.01 - Grey and White Iron Castings

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:A942/A942M −95 (Reapproved 2018)
Standard Specification for
Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-
Resistant Roll Shells
This standard is issued under the fixed designationA942/A942M; 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. Ordering Information
1.1 Thisspecificationcoversdoublepour,centrifugallycast, 4.1 Orders for material to this specification shall include the
following:
abrasion-resistant roll shells for general application. The outer
layer is white iron and the inner layer is gray iron. There shall 4.1.1 Specification title, designation, and year of issue,
4.1.2 Quantity of castings required,
be no gradient of mottled iron between the white iron and the
gray iron. 4.1.3 Required dimensions and thickness of white iron layer
(8.1),
1.2 The values stated in either SI units or inch-pound units
4.1.4 Surface condition—as cast or machined,
are to be regarded separately as standard. The values stated in
4.1.5 Type of white iron required for the outer layer of the
each system may not be exact equivalents; therefore, each
casting (7.1),
system shall be used independently of the other. Combining
4.1.6 Class of gray iron required for the inner layer (7.2),
values from the two systems may result in nonconformance
4.1.7 Certification, if required (Section 13), and
with the standard.
4.1.8 Special position of marking information, if required
1.2.1 Within the text, the SI units are shown in brackets.
(Section 14).
1.3 This international standard was developed in accor-
4.2 Additional requirements may be agreed upon between
dance with internationally recognized principles on standard-
the manufacturer and the purchaser.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Materials and Manufacture
mendations issued by the World Trade Organization Technical
5.1 Both the white and the gray irons may be melted by any
Barriers to Trade (TBT) Committee.
suitable melting process.
2. Referenced Documents 5.2 The white iron portion of the casting shall be produced
by chemistry rather than chilling.
2.1 ASTM Standards:
A48/A48M Specification for Gray Iron Castings
6. Chemical Composition
E8/E8M Test Methods for Tension Testing of Metallic Ma-
6.1 A chemical analysis shall be performed by the manu-
terials
facturer on both the white and gray irons. The chemical
E10 Test Method for Brinell Hardness of Metallic Materials
compositions shall be controlled to obtain the required me-
chanical properties.
3. Classification
7. Mechanical Properties
3.1 The white iron portion of the casting shall be classified
by type based upon Brinell hardness.
7.1 The white iron shall conform to the following require-
ments:
3.2 Thegrayironportionofthecastingshallbeclassifiedby
class based upon tensile strength. Type I – 450 to 500 HB
Type II – 500 to 550 HB
Type III – 550 to 600 HB
1 Type IV – 600 to 650 HB
This specification is under the jurisdiction of ASTM Committee A04 on Iron
CastingsandisthedirectresponsibilityofSubcommitteeA04.01onGreyandWhite
7.2 The gray iron shall conform to the following require-
Iron Castings.
ments:
Current edition approved Nov. 1, 2018. Published November 2018. Originally
Tensile Strength
approved in 1995. Last previous edition approved in 2012 as A942 – 95 (2012).
Class min, ksi min, [MPa]
DOI: 10.1520/A0942-95R18.
No. 20 20 [138]
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
No. 25 25 [172]
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
No. 30 30 [207]
Standards volume information, refer to the standard’s Document Summary page on
No. 35 35 [241]
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A942/A942M−95 (Reapproved 2018)
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: A942/A942M − 95 (Reapproved 2012) A942/A942M − 95 (Reapproved 2018)
Standard Specification for
Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-
Resistant Roll Shells
This standard is issued under the fixed designation A942/A942M; 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.
ε NOTE—Designation was converted to dual and editorial changes were made throughout in November 2013.
1. 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 SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformancenonconformance with the standard.
1.2.1 Within the text, the SI units are shown in brackets.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A48/A48M Specification for Gray Iron Castings
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E10 Test Method for Brinell Hardness of Metallic Materials
3. Classification
3.1 The white iron portion of the casting shall be classified by type based upon Brinell Hardness.hardness.
3.2 The gray iron portion of the casting shall be classified by class based upon tensile strength.
4. Ordering Information
4.1 Orders for material to this specification shall include the following:
4.1.1 Specification title, designation, and year of issue,
4.1.2 Quantity of castings required,
4.1.3 Required dimensions and thickness of white iron layer (8.1),
4.1.4 Surface condition—as cast or machined,
4.1.5 Type of white iron required for the outer layer of the casting (7.1),
4.1.6 Class of gray iron required for the inner layer (7.2),
4.1.7 Certification, if required (Section 13), and
4.1.8 Special position of marking information, if required (Section 14).
4.2 Additional requirements may be agreed upon between the manufacturer and the purchaser.
This specification is under the jurisdiction of ASTM Committee A04 on Iron Castings and is the direct responsibility of Subcommittee A04.01 on Grey and White Iron
Castings.
Current edition approved Oct. 1, 2012Nov. 1, 2018. Published November 2012November 2018. Originally approved in 1995. Last previous edition approved in 20072012
as A942 – 95 (2007).(2012). DOI: 10.1520/A0942-95R12E01.10.1520/A0942-95R18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A942/A942M − 95 (2018)
5. Materials and Manufacture
5.1 Both the white and the gray irons may be melted by any suitable melting process.
5.2 The white iron portion of the casting shall be produced by chemistry rather than chilling.
6. Chemical Composition
6.1 A chemical analysis shall be performed by the manufacturer on both the white and gray irons. The chemical compositions
shall be controlled to obtain the required mechanical properties.
7. Mechanical Properties
7.1 The white iron shall conform to the following requirements:
Type I — 450 to 500 HB
Type II — 500 to 550 HB
Type III — 550 to 600 HB
Type IV — 600 to 650 HB
Type I – 450 to 500 HB
Type II – 500
...