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ASTM A1048/A1048M-06(2011)

(Specification)

Standard Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service (Withdrawn 2016)

Standard Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service (Withdrawn 2016)

ABSTRACT
This specification covers higher strength chromium-molybdenum-tungsten alloy steel forgings intended primarily for use in boilers and pressure vessels for elevated temperature service. Materials shall be manufactured by melting processes, except that the open hearth process shall not be used, and that the molten steel shall be vacuum degassed prior to or during teeming of the ingot. The alloy steels may then be given an intermediate heat treatment such as normalizing and tempering or a subcrititcal anneal prior to rough machining. Heat analysis shall be obtained from samples to ensure chemical composition requirements are met. The steel forgings shall also undergo tension and Charpy impact tests and shall conform to the following required mechanical properties: tensile strength, yield strength, elongation, reduction of area, lateral expansion, minimum average absorbed energy, and minimum single value. Nondestructive examination procedures, such as straight-beam and angle-beam ultrasonic examination, and magnetic particle examination, shall also be executed.
SCOPE
1.1 This specification covers chromium-molybdenum-tungsten alloy steel forgings intended primarily for use in boilers and pressure vessels for elevated temperature service.
1.1.1 Elevated temperatures are temperatures in the range where creep and stress rupture properties are important for the alloy steels in this specification.
1.2 Supplementary requirements are provided both in this specification and in the General Requirements Specification A788/A788M for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the purchase order or contract.
1.3 Unless the order specifies the applicable “M” specification designation, the forgings shall be supplied to the inch-pound units.
1.4 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text and tables, the SI units are shown in brackets. 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 specification.
WITHDRAWN RATIONALE
This specification covers chromium-molybdenum-tungsten alloy steel forgings intended primarily for use in boilers and pressure vessels for elevated temperature service.
Formerly under the jurisdiction of Committee A01 on Steel, Stainless Steel and Related Alloys, this specification was withdrawn in May 2016. This standard is being withdrawn without replacement due to its limited use by industry.

General Information

Status
Withdrawn
Publication Date
30-Sep-2011
Withdrawal Date
02-May-2016
ICS
77.140.30 - Steels for pressure purposes
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.06 - Steel Forgings and Billets
Current Stage
Ref Project

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ASTM A1048/A1048M-06(2011) - Standard Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service (Withdrawn 2016)ASTM A1048/A1048M-06(2011) - Standard Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service (Withdrawn 2016)
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ASTM A1048/A1048M-06(2011) - Standard Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service (Withdrawn 2016)
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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: A1048/A1048M −06(Reapproved 2011)
Standard Specification for
Pressure Vessel Forgings, Alloy Steel, Higher Strength
Chromium-Molybdenum-Tungsten for Elevated Temperature
1
Service
This standard is issued under the fixed designation A1048/A1048M; 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 A966/A966M Practice for Magnetic Particle Examination of
Steel Forgings Using Alternating Current
1.1 This specification covers chromium-molybdenum-
tungsten alloy steel forgings intended primarily for use in
3. Ordering Information and General Requirements
boilers and pressure vessels for elevated temperature service.
3.1 In addition to the ordering information required by
1.1.1 Elevated temperatures are temperatures in the range
Specification A788/A788M, the purchaser should include with
where creep and stress rupture properties are important for the
the inquiry and order the following information:
alloy steels in this specification.
3.1.1 A drawing, sketch, or written description of the
1.2 Supplementary requirements are provided both in this
required forging and the manner of providing test material (see
specification and in the General Requirements Specification
Section 6).
A788/A788M for use when additional testing or inspection is
3.1.2 Desired supplementary requirements including those
desired. These shall apply only when specified individually by
from Specification A788/A788M.
the purchaser in the purchase order or contract.
3.1.3 Requirements for alternate ultrasonic examination
1.3 Unless the order specifies the applicable “M” specifica-
procedure (see 7.1.2).
tion designation, the forgings shall be supplied to the inch-
3.1.4 At the purchaser’s option Test Method A966/A966M
pound units.
shall be used for the magnetic particle examination.
1.4 The values stated in either inch-pound or SI (metric)
3.2 Forgings supplied to this specification shall conform to
units are to be regarded separately as standard. Within the text
the requirements of Specification A788/A788M which, in
andtables,theSIunitsareshowninbrackets.Thevaluesstated
addition to ordering information, includes manufacturing
in each system may not be exact equivalents; therefore, each
requirements, testing and retesting methods and procedures,
system shall be used independently of the other. Combining
marking, certification, product analysis variations and addi-
values from the two systems may result in nonconformance
tional supplementary requirements.
with the specification.
3.3 If the requirements of this specification are in conflict
2. Referenced Documents with those of Specification A788/A788M, the requirements of
this specification shall prevail.
2
2.1 ASTM Standards:
A275/A275M Practice for Magnetic Particle Examination of
4. Materials and Manufacture
Steel Forgings
4.1 The steel melting procedures of Specification A788/
A388/A388M Practice for Ultrasonic Examination of Steel
A788M shall apply except that the open hearth process shall
Forgings
notbeused,andthatthemoltensteelshallbevacuumdegassed
A788/A788M Specification for Steel Forgings, General Re-
prior to or during teeming of the ingot to remove objectionable
quirements
gasses, notably hydrogen.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
4.2 Heat Treatment:
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4.2.1 After being permitted to transform following comple-
A01.06 on Steel Forgings and Billets.
tion of forging the material may be given an intermediate heat
Current edition approved Oct. 1, 2011. Published January 2012. Originally
treatment such as normalizing and tempering or a subcritical
approved in 2006. Last previous edition approved in 2006 as A1048/A1048M – 06.
DOI: 10.1520/A1048_A1048M-06R11.
anneal prior to preliminary machining to the required heat
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
treatment contour. The purchaser may specify supplementary
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
requirement S1 to have the forgings rough machined before the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. final heat treatment.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A1048/A1048M − 06 (2011)
4.2.2 Heat treatment applied either after rough machining or 6.6 For heat-treated weights over 10 000 lb [4500 kg] and
directly after cooling from forging shall consist of
...

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