ASTM A645/A645M-99a
(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
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.
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Designation: A 645/A 645M – 99a
Standard Specification for
Pressure Vessel Plates, Five Percent Nickel Alloy Steel,
Specially Heat Treated
ThisstandardisissuedunderthefixeddesignationA645/A645M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope tained austenite and characterized by a lamellar pattern of
2 alternate acicular grains of martensite and ferrite. This opera-
1.1 This specification covers austenitized, quenched, tem-
tion is performed subsequent to an initial austenitizing and
perized, and reversion-annealed 5% nickel alloy steel plates
quenching.
intended primarily for welded pressure vessels for service at
low or cryogenic temperatures.
4. General Requirements and Ordering Information
1.2 Themaximumthicknessofplateswhichcanbesupplied
4.1 Material supplied to this material specification shall
under this specification is limited only by the capacity of the
conform to Specification A20/A20M. These requirements
material to meet the specified requirements.
outline the testing and retesting methods and procedures,
1.3 This material is susceptible to magnetization. Use of
permissible variations in dimensions and weight, quality and
magnets in handling after heat treatment should be avoided if
repair of defects, marking, loading, etc.
residual magnetism would be detrimental to subsequent fabri-
4.2 Specification A20/A20M also establishes the rules for
cation or service.
the ordering information that should be complied with when
1.4 The values stated in either inch-pound units or SI units
purchasing material to this specification.
are to be regarded separately as standard. Within the text, the
4.3 In addition to the basic requirements of this specifica-
SI units are shown in brackets. The values stated in each
tion, certain supplementary requirements are available when
system are not exact equivalents; therefore, each system must
additional control, testing, or examination is required to meet
beusedindependentlyoftheother.Combiningvaluesfromthe
end use requirements. These include:
two systems may result in nonconformance with the specifi-
4.3.1 Vacuum treatment,
cation.
4.3.2 Additional or special tension testing,
2. Referenced Documents 4.3.3 Impact testing, and
4.3.4 Nondestructive examination.
2.1 ASTM Standards:
4.4 The purchaser is referred to the listed supplementary
A20/A20M Specification for General Requirements for
3 requirements in this specification and to the detailed require-
Steel Plates for Pressure Vessels
ments in Specification A20/A20M.
3. Terminology 4.5 If the requirements of this specification are in conflict
with the requirements of Specification A20/A20M, the re-
3.1 Definitions of Terms Specific to This Standard:
quirements of this specification shall prevail.
3.1.1 reversion annealing—heatingtoanoptimumtempera-
ture above the Ac , followed by quenching or air cooling to
5. Materials and Manufacture
develop maximum toughness. This operation is performed
5.1 Steelmaking Practice—The steel shall be killed and
subsequent to temperizing.
shall conform to the fine austenitic grain size requirements of
3.1.2 temperizing—heating to an optimum temperature and
Specification A 20/A 20M.
quenching to develop a microstructure containing some re-
6. Heat Treatment
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
6.1 All plates shall be heat treated in accordance with 6.2.
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
Shell plates and other parts, including heads and reinforcing
A01.11 on Steel for Boilers and Pressure Vessels.
pads, which are heated above 1125°F [605°C] for forming,
Current edition approved June 10, 1999. Published September 1999. Originally
published as A645–71. Last previous edition A645/A645M–99.
shall be heat treated after forming,
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
6.2 Procedure and Sequence:
cation SA-645 in Section II of that Code.
3 6.2.1 Hardening:
Annual Book of ASTM Standards, Vol 01.04.
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A 645/A 645M – 99a
6.2.1.1 The plates shall be heated to a temperature of 1575 8. Mechanical Requirements
to 1675°F [855 to 915°C], held at this temperature for a
8.1 Tension Tests—The material as represented by tension
minimum of 1 h/in. [2.4 min/mm] of thickness, but in no case
test specimens shall conform to the requirements prescribed in
less than 15 min, and then water-quenched to below 300°F
Table 2.
[150°C].
8.1.1 For nominal plate thicknesses of ⁄4 in. [20 mm] and
6.2.2 Temperizing: 1
under, the 1 ⁄2-in. [40-mm] wide rectangular specimen may be
6.2.2.1 Theplatesshallbereheatedtoatemperatureof1275
usedforthetensiontest,andtheelongationmaybedetermined
to 1400°F [690 to 760°C], held at this temperature for a
in a 2-in. [50-mm] gage length that includes the fracture and
minimum of 1 h/in. [2.4 min/mm] of thickness, but in no case
that shows the greatest elongation.
less than 15 min, and then water-quenched to below 300°F
8.2 Impact Tests:
[150°C].
8.2.1 CharpyV-notchtestsshallbemadeinaccordancewith
6.2.3 Reversion Annealing:
the general requirements of Specification A20/A20M.
6.2.3.1 Theplatesshallbereheatedtoatemperatureof1150
8.2.2 The longitudinal axis of the test specimens shall be
to 1225°F [620 to 665°C], held at this temperature for a
transverse to the final direction of rolling of the plate.
minimum of 1 h/in. [2.4 min/mm] of
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