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ASTM A320/A320M-21a
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service (Includes all amendments And changes 6/13/2022).
Přeložit název
NORMA vydána dne 1.3.2021
Informace o normě:
Označení normy: ASTM A320/A320M-21a
Poznámka: NEPLATNÁ
Datum vydání normy: 1.3.2021
Kód zboží: NS-1020150
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM A320/A320M-21a :
Keywords:
additional elements, austenitic stainless steel, bolts—steel, chromium-molybdenum steel, bolting components—steel, markings on fittings, nickel-chromium-molybdenum alloy steel, pressure vessel service, stainless steel bolting, starting material, steel bars—alloy, steel bolting, steel flanges, steel valves, temperature service applications—low ,, ICS Number Code 21.060.01 (Fasteners in general),77.080.20 (Steels)
Doplňující informace
| 1. Scope | ||||||||||||||||
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1.1?This specification1.2?Several grades are covered, including both ferritic and austenitic steels designated L7, B8, etc. Selection will depend on design, service conditions, mechanical properties, and low-temperature characteristics. The mechanical requirements of Table 1 indicate the diameters for which the minimum mechanical properties apply to the various grades and classes, and Table 2 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 2 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 1:?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.
1.3?The following referenced general requirements are indispensable for application of this specification: Specification A962/A962M. 1.4?Nuts for use with bolting are covered in Section 10 and the nut material shall be impact tested. 1.5?Supplementary Requirements are provided for use at the option of the purchaser. The supplementary requirements shall apply only when specified in the purchase order or contract. 1.6?This specification is expressed in both inch-pound units and SI units; however, unless the purchase order or contract specifies the applicable 1.7?The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.8?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||||||
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