ASME BPVC 2023 Section II part A-2

SA-748/SA-748M ASME BPVC.II.A-2023
1228
Standard Specification for
Statically Cast Chilled White Iron-Gray Iron Dual Metal Rolls
for Pressure Vessel Use
1. Scope
1.1 This specification covers statically cast dual metal rolls
with the outer layer of the roll body being chilled white iron of
different chemical composition than the core and journals of
the roll which is gray cast iron. The castings are suitable for
pressure containing parts, the design strength of which is based
on the gray iron portion of the cylinder. The castings are
suitable for service at temperatures up to 450°F [232°C].
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-conformance
with the standard.
1.3 The following safety hazards statement pertains only to
the test method portion, 9, of this specification: This standard
does not purport to address all of the safety concerns, if any,
associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations prior
to use.
2. Referenced Documents
2.1 ASTM Standards:
A278/A278M Specification for Gray Iron Castings for
Pressure-Containing Parts for Temperatures Up to 650°F
350°C
A667/A667M Specification for Centrifugally Cast Dual
Metal Gray and White Cast Iron Cylinders
3. Ordering Information
3.1 Orders for material under this specification shall include
the following information:
3.1.1 ASTM designation and year of issue,
3.1.2 Dimensions of dual rolls,
3.1.3 Class of gray iron in the roll core see 4.2,
3.1.4 Inspection requirements, if different see 10.1,
3.1.5 Certification, if required see 11.1, and
3.1.6 Special position of marking information, if required
see 12.1.
3.2 Any additional requirements not covered in this specification
are subject to agreement between the manufacturer and
purchaser.
4. Materials and Manufacture
4.1 The melting procedure shall be optional with the
foundry.
4.2 The chilled white iron exterior of the roll body shall be