1、Designation:A320/A320M17aStandard Specification forAlloy-Steel and Stainless Steel Bolting for Low-TemperatureService1This standard is issued under the fixed designation A320/A320M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the
2、year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification2covers al
3、loy steel bolting materialsand bolting components for pressure vessels,valves,flanges,and fittings for low-temperature service.See SpecificationA962/A962M for the definition of bolting.The bars shall behot-wrought and may be further processed by centerlessgrinding or by cold drawing.Austenitic stain
4、less steel may besolution annealed or annealed and strain-hardened.Whenstrain hardened austenitic stainless steel is ordered,the pur-chaser should take special care to ensure that Appendix X1 isthoroughly understood.1.2 Several grades are covered,including both ferritic andaustenitic steels designat
5、ed L7,B8,etc.Selection will dependon design,service conditions,mechanical properties,andlow-temperature characteristics.The mechanical requirementsof Table 1 indicate the diameters for which the minimummechanical properties apply to the various grades and classes,and Table 2 stipulates the requireme
6、nts for Charpy impactenergy absorption.The manufacturer should determine that thematerial can conform to these requirements before parts aremanufactured.For example,when Grade L43 is specified tomeet the Table 2 impact energy values at 150 F 101 C,additional restrictions(such as procuring a steel wi
7、th lower Pand S contents than might normally be supplied)in thechemical composition for AISI 4340 are likely to be required.NOTE1The committee formulating this specification has includedseveral grades of material that have been rather extensively used for thepresent purpose.Other compositions will b
8、e considered for inclusion bythe committee from time to time as the need becomes apparent.Usersshould note that hardenability of some of the grades mentioned mayrestrict the maximum size at which the required mechanical properties areobtainable.1.3 The following referenced general requirements are i
9、n-dispensable for application of this specification:SpecificationA962/A962M.1.4 Nuts for use with bolting are covered in Section 10 andthe nut material shall be impact tested.1.5 Supplementary Requirements are provided for use at theoption of the purchaser.The supplementary requirements shallapply o
10、nly when specified in the purchase order or contract.1.6 This specification is expressed in both inch-pound unitsand SI units;however,unless the purchase order or contractspecifies the applicable M specification designation(SI)units,the inch-pound units shall apply.1.7 The values stated in either SI
11、 units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.8 This international st
12、andard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Ref
13、erenced Documents2.1 ASTM Standards:3A194/A194M Specification for Carbon Steel,Alloy Steel,and Stainless Steel Nuts for Bolts for High Pressure orHigh Temperature Service,or BothA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA962/A962M Specification for Common Requirements
14、forBolting Intended for Use at Any Temperature from Cryo-genic to the Creep Range1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for Piping Ap
15、plications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved May 1,2017.Published May 2017.Originallyapproved in 1948.Last previous edition approved in 2017 as A320/A320M 17.DOI:10.1520/A0320_A0320M-17A.2For ASME Boiler and Pressure Vessel Code applications,se
16、e related Specifi-cation SA-320 in Section II of that Code.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was de
