1、Designation:A556/A556M96(Reapproved 2012)Standard Specification forSeamless Cold-Drawn Carbon Steel Feedwater HeaterTubes1This standard is issued under the fixed designation A556/A556M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,
2、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.Scope1.1 This specification2covers minimum-wall-thickness,seamless cold-drawn carbon steel tubes including bending into
3、the form of U-tubes,if specified,for use in tubular feedwaterheaters.1.2 The tubing sizes covered shall be58to 114-in.15.9 to31.8-mm outside diameter,inclusive,with minimum wallthicknesses equal to or greater than 0.045 in.1.1 mm.1.3 Optional supplementary requirements are provided,andwhen desired,s
4、hall be stated in the order.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as the standard.Within the text,the SI units are shown in brackets.The values stated in eachsystem are not exact equivalents;therefore,each system mustbe used independently of the ot
5、her.Combining values from thetwo systems may result in nonconformance with the specifi-cation.The inch-pound units shall apply unless the“M”designation of this specification is specified in the order.2.Referenced Documents2.1 ASTM Standards:3A450/A450M Specification for General Requirements forCarbo
6、n and Low Alloy Steel TubesE30 Test Methods for ChemicalAnalysis of Steel,Cast Iron,Open-Hearth Iron,and Wrought Iron(Withdrawn 1995)43.Ordering Information3.1 Orders for material under this specification shouldinclude the following as required to describe the desiredmaterial adequately:3.1.1 Quanti
7、ty(feet,metres,or number of pieces),3.1.2 Name of material(seamless steel tubing),3.1.3 Dimensions(outside diameter and minimum wallthickness),3.1.4 Length(specific or random),3.1.5 Manufacture(cold drawn),3.1.6 Grade(chemical composition),3.1.7 Optional requirements,3.1.8 Bending RequirementsIf ord
8、er specifies tubes to bebent,the design of the U-tubes shall accompany the order.Purchaser must specify if stress-relief anneal of the U-bends isrequired,3.1.9 Test report required(see Certification Section ofSpecification A450/A450M),3.1.10 Specification number,and3.1.11 Special requirements and an
9、y supplementary require-ments selected.4.General Requirements4.1 Material furnished to this specification shall conform tothe applicable requirements of the current edition of theSpecification A450/A450M,unless otherwise provided herein.5.Manufacture5.1 ManufactureTubes shall be made by the seamless
10、process and shall be cold drawn.5.2 Heat Treatment:5.2.1 Cold-drawn tubes shall be heat treated after the finalcold-draw pass at a temperature of 1200F 640C or higher toensure ductility satisfactory for rolling into tube sheets and tomeet mechanical properties as specified.5.2.2 If stress-relief ann
11、eal of the U-bends is specified,theanneal shall consist of heating the bent portion within a rangeof 1100 to 1200F 585 to 640C.6.Chemical Composition6.1 The steel shall conform to one of the requirements as tochemical composition as prescribed in Table 1.6.2 When a grade is ordered under this specif
12、ication,sup-plying an alloy grade that specifically requires the addition ofany element other than those listed for the ordered grade inTable 1 is not permitted.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsib
13、ility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved March 1,2012.Published November 2012.Originallyapproved in 1965.Last previous edition approved in 2005 as A556/A556M 96(2005).DOI:10.1520/A0556_A0556M-96R12.2For ASME Boiler and Pressure Vessel Code applications se
14、e related Specifi-cation SA-556 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.4The la
15、st approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1Copyright by ASTM Intl(all rights reserved);7.Product Analysis7.1 When requested in the purchase order,a product a
16、naly-sis shall be made by the manufacturer or supplier from one tubeor billet per heat.7.2 If the original test for product analysis fails,retests oftwo additional tubes or billets shall be made.Both retests forthe elements in question shall meet the requirements of thisspecification;otherwise,all remaining material in the heat orlot(Note 1)shall be rejected or,at the option of the producer,each tube may be individually tested for acceptance.Tubes thatdo not meet the requirements of this specifi
