ASTM A320/A320M REV A Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
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- BSI BS EN ISO 14122-3 + A1 Safety of machinery - Permanent means of access to machinery - Part 3: Stairways, stepladders and guard-rails - AMD: August 31, 2010
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- BSI BS EN 1012-1 Compressors and vacuum pumps - Safety requirements Part 1: Air compressors
- BSI BS EN ISO 14122-3 + A1 Safety of machinery - Permanent means of access to machinery - Part 3: Stairways, stepladders and guard-rails - AMD: August 31, 2010
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- BSI BS EN ISO 14122-3 + A1 Safety of machinery - Permanent means of access to machinery - Part 3: Stairways, stepladders and guard-rails - AMD: August 31, 2010
- BSI BS EN ISO 14122-3 + A1 Safety of machinery - Permanent means of access to machinery - Part 3: Stairways, stepladders and guard-rails - AMD: August 31, 2010
- BSI BS EN 1846-2 + A1 Firefighting and rescue service vehicles Part 2: Common requirements - Safety and performance - CORR: November 30, 2010; AMD: August 31, 2013
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ASTM International
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
N A320/A320M REV A
Annotation
This specification2covers alloy steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for low-temperature service. See Specification A962/A962M for the definition of bolting. The bars shall be hot-wrought and may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. When strain hardened austenitic stainless steel is ordered, the purchaser should take special care to ensure that Appendix X1 is thoroughly understood.
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.
The following referenced general requirements are indispensable for application of this specification: Specification A962/A962M.
