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ASTM A320
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ASTM A320 Revision 84A, September 28, 1984 Standard Specification for ALLOY STEEL BOLTING MATERIALS FOR LOW-TEMPERATURE SERVICE
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Description / Abstract:
This specification2 covers alloy steel bolting
materials for pressure vessels, valves, flanges, and fittings for
low-temperature service. The term "bolting material" as used in
this specification covers rolled, forged, or strain hardened bars,
bolts, screws, studs, and stud bolts. The bars shall be
hot-wrought. The material may be further processed by centerless
grinding or by cold drawing. Austenitic stainless steel may be
solution annealed or annealed and strain-hardened.
Several grades are covered, including both ferritic and austenitic steels designated L 7, B8, etc. Selection will depend on design, service conditions, mechanical properties, and low-temperature characteristics. The mechanical requirements of Table 2 indicate the diameters for which the minimum mechanical properties apply to the various grades and classes, and Table 4 stipulates the requirements for Charpy impact energy absorption. The manufacturer should determine that the material can conform to these requirements before parts are manufactured. For example, when Grade L43 is specified to meet the Table 4 impact energy values at -150°F (-101°C), additional restrictions (such as procuring a steel with lower P and S contents than might normally be supplied) in the chemical composition for AISI 4340 are likely to be required.
NOTE-The committee formulating this specification has included several grades of material that have been rather extensively used for the present purpose. Other compositions will be considered for inclusion by the committee from time to time as the need becomes apparent. Users should note that hardenability of some of the grades mentioned may restrict the maximum size at which the required mechanical properties are obtainable.
Nuts for use with this bolting material are covered in Section 9.
Supplementary Requirements (S I and S2) of an optional nature are provided. They shall apply only when specified in the inquiry, contract and order.
The values stated in inch-pound units are to be regarded as the standard.
2 For ASME Boiler and 'Pressure Vessel Code applications, see related Specification SA-320 in Section II of that Code.
Several grades are covered, including both ferritic and austenitic steels designated L 7, B8, etc. Selection will depend on design, service conditions, mechanical properties, and low-temperature characteristics. The mechanical requirements of Table 2 indicate the diameters for which the minimum mechanical properties apply to the various grades and classes, and Table 4 stipulates the requirements for Charpy impact energy absorption. The manufacturer should determine that the material can conform to these requirements before parts are manufactured. For example, when Grade L43 is specified to meet the Table 4 impact energy values at -150°F (-101°C), additional restrictions (such as procuring a steel with lower P and S contents than might normally be supplied) in the chemical composition for AISI 4340 are likely to be required.
NOTE-The committee formulating this specification has included several grades of material that have been rather extensively used for the present purpose. Other compositions will be considered for inclusion by the committee from time to time as the need becomes apparent. Users should note that hardenability of some of the grades mentioned may restrict the maximum size at which the required mechanical properties are obtainable.
Nuts for use with this bolting material are covered in Section 9.
Supplementary Requirements (S I and S2) of an optional nature are provided. They shall apply only when specified in the inquiry, contract and order.
The values stated in inch-pound units are to be regarded as the standard.
2 For ASME Boiler and 'Pressure Vessel Code applications, see related Specification SA-320 in Section II of that Code.