ASTM A645/A645M-05
(Specification)Standard Specification for Pressure Vessel Plates, Five Percent Nickel Alloy Steel, Specially Heat Treated
Standard Specification for Pressure Vessel Plates, Five Percent Nickel Alloy Steel, Specially Heat Treated
ABSTRACT
This specification covers specially heat treated 5% and 5 1/2% nickel alloy steel plates intended primarily for welded pressure vessels for service at low or cryogenic temperatures. Plates are classified as Grade A and Grade B. The steel shall be killed and shall conform to the fine austenitic grain size requirements specified. Plates shall be heat treated in accordance with the required specifications. The steel shall conform to the chemical requirements specified. Tensions tests and impacts tests shall be made to meet the mechanical requirements specified.
SCOPE
1.1 This specification covers austenitized, quenched, temperized, and reversion-annealed 5% nickel alloy steel plates intended primarily for welded pressure vessels for service at low or cryogenic temperatures.
1.2 The maximum thickness of plates which can be supplied under this specification is limited only by the capacity of the material to meet the specified requirements.
1.3 This material is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service.
1.4 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 the specification.
General Information
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Standards Content (Sample)
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Designation: A645/A645M – 05
Standard Specification for
1
Pressure Vessel Plates, 5 % and 5 ⁄2 % Nickel Alloy Steels,
1
Specially Heat Treated
This standard is issued under the fixed designationA645/A645M; 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* 3.2 Specification A20/A20M also establishes the rules for
2 the ordering information that should be complied with when
1.1 This specification covers specially heat treated 5 % and
1 purchasing plates to this specification.
5 ⁄2 % nickel alloy steel plates intended primarily for welded
3.3 In addition to the basic requirements of this specifica-
pressure vessels for service at low or cryogenic temperatures.
tion, certain supplementary requirements are available when
1.2 Themaximumthicknessofplateswhichcanbesupplied
additional control, testing, or examination is required to meet
under this specification is limited only by the capacity of the
end use requirements.
material to meet the specified requirements.
3.4 The purchaser is referred to the listed supplementary
1.3 This material is susceptible to magnetization. Use of
requirements in this specification and to the detailed supple-
magnets in handling after heat treatment should be avoided if
mentary requirements in Specification A20/A20M.
residual magnetism would be detrimental to subsequent fabri-
3.5 If the requirements of this specification are in conflict
cation or service.
with the requirements of SpecificationA20/A20M, the require-
1.4 The values stated in either inch-pound units or SI units
ments of this specification shall prevail.
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
4. Materials and Manufacture
system are not exact equivalents; therefore, each system must
4.1 Steelmaking Practice—The steel shall be killed and
be used independently of the other. Combining values from the
shall conform to the fine austenitic grain size requirements of
two systems may result in nonconformance with the specifi-
Specification A20/A20M.
cation.
5. Heat Treatment
2. Referenced Documents
3 5.1 Grade A plates shall be heat treated in accordance with
2.1 ASTM Standards:
5.2.GradeBplatesshallbeheattreatedinaccordancewith5.3.
A20/A20M Specification for General Requirements for
Shell plates and other parts, including heads and reinforcing
Steel Plates for Pressure Vessels
pads that are heated above 1125°F [605°C] for forming, shall
3. General Requirements and Ordering Information be heat treated after forming,
5.2 Grade A, Procedure and Sequence:
3.1 Plates supplied to this product specification shall con-
5.2.1 Hardening—The plates shall be heated to a tempera-
form to Specification A20/A20M, which outlines the testing
turewithintherangefrom1575to1675°F[855to915°C],held
and retesting methods and procedures, permissible variations
within that temperature range for a minimum of 1 h/in. [2.4
in dimensions and mass, quality and repair of defects, marking,
min/mm]ofthickness,butinnocaselessthan15min,andthen
loading, and so forth.
water-quenched to below 300°F [150°C].
5.2.2 Intermediate Heat Treatment—The plates shall be
reheated to a temperature within the range from 1275 to
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
1400°F [690 to 760°C], held within that temperature range for
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.11 on Steel Plates for Boilers and Pressure Vessels. a minimum of 1 h/in. [2.4 min/mm] of thickness, but in no case
Current edition approved May 1, 2005. Published May 2005. Originally
less than 15 min, and then water-quenched to below 300°F
approved in 1971. Last previous edition approved in 1999 as A645/A645M – 99a.
[150°C].
DOI: 10.1520/A0645_A0645M-05.
2
5.2.3 Tempering—Theplatesshallbereheatedtoatempera-
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-645 in Section II of that Code.
turewithintherangefrom1150to1225°F[620to665°C],held
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
within that temperature range for a minimum of 1 h/in. [2.4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
min/mm]ofthickness,butinnocaselessthan15min,andthen
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. water-quenched or air cooled to below 300°F [150°C].
*A Summary of Changes section appears at the end of this standard.
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