1、Designation:A865/A865M06(Reapproved 2012)Standard Specification forThreaded Couplings,Steel,Black or Zinc-Coated(Galvanized)Welded or Seamless,for Use in Steel PipeJoints1This standard is issued under the fixed designation A865/A865M;the number immediately following the designation indicates the yea
2、rof original adoption or,in the case of revision,the 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.1.Scope*1.1 This specification covers black or galvanized welded orseaml
3、ess threaded steel couplings for use with steel pipe inNPS18to NPS 20 DN 6 to DN 500 inclusive(Note 1).Couplings ordered under this specification are intended for theuses outlined in the pipe specifications referencing this speci-fication.NOTE1The dimensionless designator NPS(nominal pipe size)andDN
4、 diameter nominal has been substituted in this standard for suchtraditional terms as nominal diameter,size,and nominal size.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eac
5、hsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2A700 Practices for Packaging,Marking,and Loading Meth-ods for Steel Products for Shipment(Withdrawn 2014)3B6 Specification fo
6、r ZincE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current(Electromagnetic)Test-ing Methods2.2 ANSI Standard:B 1.20.1 Pipe Threads42.3 API Standards:5B Specification for Threading,Gaging,and Thread Inspec-tion of Casing,Tubing,and Line Pipe Threads55L Specification for Line
7、 Pipe53.Ordering Information3.1 Orders for material under this specification shouldinclude the following,as required,to describe the desiredmaterial adequately:3.1.1 Specification number,3.1.2 Quantity(pieces),3.1.3 Name of material(steel pipe-couplings),3.1.4 Method of manufacture(welded or seamles
8、s),3.1.5 Finish(black or Type I or Type II)galvanized(see8.1),3.1.6 Size(NPS designator DN),3.1.7 Standard or extra-strong classification,3.1.8 Taper tapped-couplings for NPS 2 DN 50 andsmaller,either recessed or non-recessed,if desired,and3.1.9 Certification(see 11.3),if required.4.Process4.1 The s
9、teel for both welded and seamless couplings shallbe made by one or more of the following processes:open-hearth,electric-furnace,or basic-oxygen.4.2 Welded couplings NPS 312DN 90 and under may bebutt-welded,unless otherwise specified.Welded couplingsover NPS 312DN 90 shall be electric-welded.5.Chemic
10、al Composition5.1 The steel shall conform to the chemical compositionrequirements as specified in Table 1.6.Dimensions6.1 Coupling dimensions are listed in Tables 2-4 and Figs.1-3.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is th
11、e direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved March 1,2012.Published November 2012.Originallyapproved in 1986.Last previous edition approved in 2006 as A865-06.DOI:10.1520/A0865_A0865M-12.2For referenced ASTM standards,visit the ASTM website,
12、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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National St
13、andards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.5Available from American Petroleum Institute(API),1220 L.St.,NW,Washington,DC 20005.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 1
14、9428-2959.United States1Copyright by ASTM Intl(all rights reserved);7.Permissible Variations in Dimensions7.1 DiameterFor couplings NPS 112DN 40 and under,the outside diameter at any point shall not vary more than164in.0.4 mm over nor more than132in.0.8 mm under thestandard specified.For couplings N
15、PS 2 DN 50 and over,theoutside diameter shall not vary more than 61%from thestandard specified.7.2 ThreadsThe variation of the threads shall not exceed6112turns for straight tapped and 61 turn for taper tappedfrom nominal as determined using gages and the gagingpractices in ANSI B 1.20.1.8.Galvanize
16、d Couplings8.1 Galvanized couplings may be coated with zinc by eitherthe hot-dipped(Type 1)or by the electrogalvanizing process.(Type II)as specified by the purchaser.The zinc used for thecoating shall be any grade of zinc conforming to SpecificationB6.8.2 Hot-dipped galvanized couplings are coated prior tothreading.8.2.1 The minimum weight of the zinc coating on theoutside surface of the hot-dipped galvanized couplings shall beequivalent to 1.6 oz/ft2490 g/m2.8.2.2 The weight of the zinc coatin
