ASTM A942-95(2001)

Standard Specification for Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion- Resistant Roll Shells

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.

General Information

• Status: Historical
• Publication Date: 31-Dec-2000
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.01 - Grey and White Iron Castings

Relations

• Replaces: ASTM A942-95 - Standard Specification for Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion- Resistant Roll Shells
• Effective Date: 01-Jan-2001
• Replaced By: ASTM A942-95(2007) - Standard Specification for Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-Resistant Roll Shells
• Effective Date: 15-Jun-2007

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 942 – 95 (Reapproved 2001)
Standard Specification for
Centrifugally Cast White Iron/Gray Iron Dual Metal Abrasion-
Resistant Roll Shells
This standard is issued under the fixed designation A 942; 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 4.1.6 Class of gray iron required for the inner layer (7.2),
4.1.7 Certification, if required (Section 13), and
1.1 Thisspecificationcoversdoublepour,centrifugallycast,
4.1.8 Special position of marking information, if required
abrasion-resistant roll shells for general application. The outer
(Section 14).
layer is white iron and the inner layer is gray iron. There shall
4.2 Additional requirements may be agreed upon between
be no gradient of mottled iron between the white iron and the
the manufacturer and the purchaser.
gray iron.
1.2 The values stated in either inch-pound units or SI units
5. Materials and Manufacture
are to be regarded separately as standard. Within the text, the
5.1 Both the white and the gray irons may be melted by any
SI units are shown in brackets. The values stated in each
suitable melting process.
system are not exact equivalents; therefore, each system must
5.2 The white iron portion of the casting shall be produced
be used independently of the other. Combining values from the
by chemistry rather than chilling.
two systems may result in nonconformance with this specifi-
cation.
6. Chemical Composition
6.1 A chemical analysis shall be performed by the manu-
2. Referenced Documents
facturer on both the white and gray irons. The chemical
2.1 ASTM Standards:
2 compositions shall be controlled to obtain the required me-
A 48 Specification for Gray Iron Castings
3 chanical properties.
E 8 Test Methods forTensionTesting of Metallic Materials
E 10 Test Method for Brinell Hardness of Metallic Materi-
7. Mechanical Properties
als
7.1 The white iron shall conform to the following require-
ments:
3. Classification
Type I — 450 to 500 HB
3.1 The white iron portion of the casting shall be classified
Type II — 500 to 550 HB
by type based upon Brinell Hardness.
Type III — 550 to 600 HB
3.2 Thegrayironportionofthecastingshallbeclassifiedby Type IV — 600 to 650 HB
class based upon tensile strength.
7.2 The gray iron shall conform to the following require-
ments:
4. Ordering Information
Tensile Strength
4.1 Orders for material to this specification shall include the
Class min, ksi min, (MPa)
following: No. 20 20 (138)
No. 25 25 (172)
4.1.1 Specification title, designation, and year of issue,
No. 30 30 (207)
4.1.2 Quantity of castings required,
No. 35 35 (241)
4.1.3 Required dimensions and thickness of white iron layer
8. Other Requirements
(8.1),
4.1.4 Surface condition—as cast or machined,
8.1 The thickness of the white iron layer shall be a mini-
4.1.5 Type of white iron required for the outer layer of the mum of ⁄2 in.
casting (7.1),
8.1.1 The thickness of the white iron layer shall be mea-
sured on the roll face at each end and shall conform to the
1 specified thickness.
This specification is under the jurisdiction of ASTM Committee A04 on Iron
CastingsandisthedirectresponsibilityofSubcommitteeA04.01onGrayandWhite
9. Finish and Appearance
Iron Castings.
Current edition approved Oct. 10, 1995. Published December 1995.
9.1 All exterior surfaces shall be machined or ground prior
Annual Book of ASTM Standards, Vol 01.02.
3 to the rolls being placed into service.
Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Driv
...