ASTM A 320/A 320M-15a Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service

Publisher: ASTM.
Publish Date: 2015.
Pages: 8.
Language: English.
Format: PDF.
Document Scope.
1.1 This specification covers 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.1.2 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.