ASTM A735/A735M-99
(Specification)Standard Specification for Pressure Vessel Plates, Low-Carbon Manganese-Molybdenum-Columbium Alloy Steel, for Moderate and Lower Temperature Service
Standard Specification for Pressure Vessel Plates, Low-Carbon Manganese-Molybdenum-Columbium Alloy Steel, for Moderate and Lower Temperature Service
SCOPE
1.1 This specification covers low-carbon manganese-molybdenum-columbium alloy steel plates for piping components and welded pressure vessels.
1.2 Four different classes are covered, which provide various tensile strength properties. A Charpy V-notch energy absorption requirement of 20 ft[dot]lbf [27J] at -50°F [-45°C] is specified for all grades.
1.2.1 Classes 1 and 2 provide minimum yield strength levels of 65 ksi [450 MPa] and 70 ksi [485 MPa] respectively. Both classes can be provided in the as-rolled condition or in the quenched-and-tempered condition.
1.2.2 Class 3 provides a minimum yield strength level of 75 ksi [515 MPa]. This grade can be provided in the as-rolled and precipitation heat-treated condition or in the quenched-and-tempered condition.
1.2.3 Class 4 provides a yield strength level of 80 ksi [550 MPa] in the as-rolled and precipitation heat-treated condition.
1.3 Current practice limits plate thickness furnished under this specification. The individual manufacturer should be consulted on size and thickness limitations.
1.4 Welding procedures are of fundamental importance and must be such as not to adversely affect the properties of the material, especially in the heat-affected zone. It is presupposed that welding procedures will be suitable for the materials being welded.
1.5 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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Standards Content (Sample)
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Designation: A 735/A 735M – 99
Standard Specification for
Pressure Vessel Plates, Low-Carbon Manganese-
Molybdenum-Columbium Alloy Steel, for Moderate and
Lower Temperature Service
This standard is issued under the fixed designation A 735/A 735M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This specification covers low-carbon manganese- 2.1 ASTM Standards:
molybdenum-columbium alloy steel plates for piping compo- A 20/A 20M Specification for General Requirements for
nents and welded pressure vessels. Steel Plates for Pressure Vessels
1.2 Four different classes are covered, which provide vari- A 435/A 435M Specification for Straight-Beam Ultrasonic
ous tensile strength properties. A Charpy V-notch energy Examination of Steel Plates
absorption requirement of 20 ft·lbf [27J] at −50°F [−45°C] is A 577/A 577M Specification for Ultrasonic Angle-Beam
specified for all grades. Examination of Steel Plates
1.2.1 Classes 1 and 2 provide minimum yield strength A 578/A 578M Specification for Straight-Beam Ultrasonic
levels of 65 ksi [450 MPa] and 70 ksi [485 MPa] respectively. Examination of Plain and Clad Steel Plates for Special
Both classes can be provided in the as-rolled condition or in the Applications
quenched-and-tempered condition.
3. General Requirements and Ordering Information
1.2.2 Class 3 provides a minimum yield strength level of
3.1 Material supplied to this material specification shall
75 ksi [515 MPa]. This grade can be provided in the as-rolled
and precipitation heat-treated condition or in the quenched- conform to the requirements of Specification A 20/A 20M.
These requirements outline the testing and retesting methods
and-tempered condition.
1.2.3 Class 4 provides a yield strength level of 80 ksi [550 and procedures, permissible variations in dimensions and
weight, quality, repair of defects, marking, loading, etc.
MPa] in the as-rolled and precipitation heat-treated condition.
1.3 Current practice limits plate thickness furnished under 3.2 Specification A 20/A 20M also establishes the rules for
compliance to the basis of purchase when purchasing material
this specification. The individual manufacturer should be
consulted on size and thickness limitations. to this specification.
3.3 Certain supplementary requirements considered suitable
1.4 Welding procedures are of fundamental importance and
must be such as not to adversely affect the properties of the for use with this specification are listed at the end of the
material, especially in the heat-affected zone. It is presupposed specification. These include some of the standardized supple-
mentary requirements listed in Specification A 20/A 20M as
that welding procedures will be suitable for the materials being
welded. well as additional ones unique to this specification.
1.5 The values stated in either inch-pound units or SI units
4. Manufacture
are to be regarded separately as standard. Within the text, the
4.1 Steelmaking Practice—The steel shall be killed and
SI units are shown in brackets. The values stated in each
shall conform to the fine austenitic grain size requirement of
system are not exact equivalents; therefore, each system must
Specification A 20/A 20M.
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specifi-
5. Heat Treatment
cation.
5.1 As-rolled Class 3 and 4 products shall be precipitation
heat treated in the temperature range from 1000 to 1200°F [540
to 650°C] for a time to be determined by the manufacturer.
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
Precipitation heat treatment is a subcritical temperature thermal
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.11 on Steel Plates for Boilers and Pressure Vessels.
Current edition approved June 10, 1990. Published September 1999. Originally
published as A 735 – 76. Last previous edition A 735/A 735M – 90 (1996). Annual Book of ASTM Standards, Vol 01.04.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 735/A 735M – 99
TABLE 1 Chemical Requirements
treatment performed to cause precipitation of submicroscopical
constituents, etc., so as to result in enhancement of some
Heat Product
Element
desirable property.
Analysis, % Analysis, %
5.2 When quenching and tempering
...
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