ASTM A988/A988M-07
(Specification)Standard Specification for Hot Isostatically-Pressed Stainless Steel Flanges, Fittings, Valves, and Parts for High Temperature Service
Standard Specification for Hot Isostatically-Pressed Stainless Steel Flanges, Fittings, Valves, and Parts for High Temperature Service
ABSTRACT
This specification covers hot isostatically-pressed, powder metallurgy, stainless steel piping components such as flanges, fittings, valves, and similar parts, for use in pressure systems and temperature service applications. The specification includes several grades of martensitic, austenitic, age hardening, and austenitic-ferritic stainless steels. Compacts shall be manufactured by placing a single powder blend into a can, evacuating the can, and sealing it. The powder shall be prealloyed and made by a melting method (such as but not limited to air or vacuum induction melting, followed by gas atomization) to produce the specified chemical composition for carbon, manganese, phosphorus, sulfur, nickel, chromium, molybdenum, columbium, tantalum, copper, tungsten, and nitrogen. Other manufacturing requirements including compact homogeneity, microstructure, and can material removal are given. Heat treatment requirements, such as austenitizing or solutioning, cooling, quenching, tempering, and ageing, and structural integrity requirements, such as density, hydrostatic tests, and ultrasonic tests are detailed as well. Mechanical properties include tensile strength, yield strength, elongation, and hardness. Product analysis shall conform to the chemical requirements.
SCOPE
1.1 This specification covers hot isostatically-pressed, powder metallurgy, stainless steel piping components for use in pressure systems. Included are flanges, fittings, valves, and similar parts made to specified dimensions or to dimensional standards, such as in ASME specification B16.5.
1.2 Several grades of martensitic, austenitic, age hardening, and austenitic-ferritic stainless steels are included in this specification.
1.3 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.4 This specification is expressed in both inch-pound units and in SI units. Unless the order specifies the applicable "M" specification designation (SI units), however, the material shall be furnished to inch-pound units.
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in parentheses. 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 the specification.
The following safety hazards caveat pertains only to test methods portions 8.1, 8.2, 9.5-9.7, and Section 10 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.
General Information
Relations
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: A988/A988M – 07
Standard Specification for
Hot Isostatically-Pressed Stainless Steel Flanges, Fittings,
1
Valves, and Parts for High Temperature Service
This standard is issued under the fixed designationA988/A988M; 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* A262 Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
1.1 This specification covers hot isostatically-pressed, pow-
A275/A275M Practice for Magnetic Particle Examination
der metallurgy, stainless steel piping components for use in
of Steel Forgings
pressure systems. Included are flanges, fittings, valves, and
A370 Test Methods and Definitions for Mechanical Testing
similar parts made to specified dimensions or to dimensional
of Steel Products
standards, such as in ASME specification B16.5.
A745/A745M Practice for Ultrasonic Examination of Aus-
1.2 Several grades of martensitic, austenitic, age hardening,
tenitic Steel Forgings
and austenitic-ferritic stainless steels are included in this
A751 Test Methods, Practices, andTerminology for Chemi-
specification.
cal Analysis of Steel Products
1.3 Supplementary requirements are provided for use when
A923 Test Methods for Detecting Detrimental Intermetallic
additional testing or inspection is desired. These shall apply
Phase in Duplex Austenitic/Ferritic Stainless Steels
only when specified individually by the purchaser in the order.
B311 Test Method for Density of Powder Metallurgy (PM)
1.4 This specification is expressed in both inch-pound units
Materials Containing Less Than Two Percent Porosity
and in SI units. Unless the order specifies the applicable “M”
E112 Test Methods for Determining Average Grain Size
specification designation (SI units), however, the material shall
E165 PracticeforLiquidPenetrantExaminationforGeneral
be furnished to inch-pound units.
Industry
1.5 The values stated in either inch-pound units or SI units
E340 Test Method for Macroetching Metals and Alloys
are to be regarded separately as the standard. Within the text,
E606 Practice for Strain-Controlled Fatigue Testing
theSIunitsareshowninparentheses.Thevaluesstatedineach
G48 Test Methods for Pitting and Crevice Corrosion Resis-
system are not exact equivalents; therefore, each system must
tance of Stainless Steels and Related Alloys by Use of
be used independently of the other. Combining values from the
Ferric Chloride Solution
two systems may result in nonconformance with the specifi-
2.2 MSS Standard:
cation.
SP 25 Standard Marking System for Valves, Fittings,
1.6 The following safety hazards caveat pertains only to test
3
Flanges, and Unions
methods portions 8.1, 8.2, 9.5-9.7, and Section 10 of this
2.3 ASME Specifications and Boiler and Pressure Vessel
specification: This standard does not purport to address all of
Codes:
the safety concerns, if any, associated with its use. It is the
B16.5 Dimensional Standards for Steel Pipe Flanges and
responsibility of the user of this standard to establish appro-
4
Flanged Fittings
priate safety and health practices and determine the applica-
2.4 ASME Specification IX Welding Qualifications:
bility of regulatory limitations prior to use.
SFA-5.4 Specification for Corrosion-Resisting Chromium
4
2. Referenced Documents
andChromium-NickelSteelCoveredWeldingElectrodes
2
SFA-5.9 Specification for Corrosion-Resisting Chromium
2.1 ASTM Standards:
and Chromium-Nickel Steel Welding Rods and Bare
4
Electrodes
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
SFA-5.11 Specification for Nickel and Nickel-Alloy Cov-
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4
ered Welding Electrodes
A01.22 onSteel Forgings and Wrought Fittings for PipingApplications and Bolting
Materials for Piping and Special Purpose Applications.
Current edition approved Sept. 1, 2007. Published October 2007. Originally
3
approved in 1998. Last previous edition approved in 2005 as A988/A988M – 05. AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
DOI: 10.1520/A0988_A0988M-07. Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or hq.com.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Society of Mechanical Engineers (ASME), ASME
Standards volume information, refer to the standard’s Document Summary page on International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
the ASTM website. www.asme.org.
*A Summary of Changes section
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.