1、Designation:A254/A254M12Standard Specification forCopper-Brazed Steel Tubing1This standard is issued under the fixed designation A254/A254M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parenth
2、eses 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.Scope1.1 This specification covers double-wall,copper-brazedsteel tubing suitab
3、le for general engineering uses,particularlyin the automotive,refrigeration,and stove industries for fuellines,brake lines,oil lines,heating and cooling units,and thelike.The tubing is available in either of two types,single stripor double strip as shown in Fig.1.1.2 UnitsThis specification is expre
4、ssed in both inch-pounds units and in SI units;however,unless the purchaseorder or contract specifies the applicable M specificationdesignation(SI units),the inch-pound units shall apply.Thevalues stated in either inch-pound units or SI units are to beregarded separately as standard.Within the text,
5、the SI units areshown in brackets.The values stated in each system may not beexact equivalents;therefore,each system shall be used inde-pendently of the other.Combining values from the two systemsmay result in non-conformance with the standard.In thisspecification hard or rationalized conversions ap
6、ply todiameters,lengths,and tensile properties.Soft conversionapplies to other SI measurements.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsE30 Te
7、st Methods for ChemicalAnalysis of Steel,Cast Iron,Open-Hearth Iron,and Wrought Iron(Withdrawn 1995)3E59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition(Withdrawn 1996)32.2 Society of Automotive Engineers Standard:4J 533 Flares for Tubing3.Ordering Information3.1 Orders
8、 for material under this specification shouldinclude the following,as required to describe the desiredmaterial adequately:3.1.1 Quantity(feet,metres or number of pieces),3.1.2 Name of material(copper-brazed steel tubing),3.1.3 Type,single strip or double strip,where necessary(seeFig.1)(normally the
9、type is not specified),3.1.4 Size(outside diameter and wall thickness;normallyinside diameter should not be specified),3.1.5 Length(specific or random),3.1.6 Inside surface cleanliness where required(see Section8),3.1.7 External coating,where required(see Section 7 andSupplementary Requirement S2),a
10、nd3.1.8 Special or supplementary requirements or exceptionsto specification.4.Manufacture4.1 The steel may be made by any commercially acceptedsteelmaking process.4.2 If a specific type of melting is required by the purchaser,it shall be as stated on the purchase order.4.3 The primary melting may in
11、corporate separate degas-sing or refining and may be followed by secondary melting,such as electroslag remelting or vacuum-arc remelting.Ifsecondary melting is employed,the heat shall be defined as allof the ingots remelted from a single primary heat.4.4 Steel may be cast in ingots or may be strand
12、cast.Whensteel of different grades is sequentially strand cast,identifica-tion of the resultant transition material is required.Theproducer shall remove the transition material by an establishedprocedure that positively separates the grades.4.5 The tubing shall be made by rolling steel strip into th
13、eform of tubing and subsequently copper brazing in a reducingatmosphere.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved Nov
14、.1,2012.Published December 2012.Originallyapproved in 1944.Last previous edition approved in 2007 as A254 97(2007).DOI:10.1520/A0254_A0254M-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume
15、 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 SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Bar
16、r Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1Copyright by ASTM Intl(all rights reserved);4.6 Tubing shall be constructed as shown in Fig.1.4.7 Tubing shall be suitably tested after brazing by themanufacturer to ensure freedom from leaks and detrimentalflaws.5.Chemical Composition5.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 1.5.2 Heat AnalysisAn analysis of each heat of steel shall bemade by the steel manufacturer to det
