ASTM_A_268_-_A_268M_-_10_2016.pdf

Designation:A268/A268M10(Reapproved 2016)Standard Specification forSeamless and Welded Ferritic and Martensitic StainlessSteel Tubing for General Service1This standard is issued under the fixed designation A268/A268M;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 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.Scope1.1 This specification2covers a number of grades ofnominal-wall-thickness,stainless steel tubing for generalcorrosion-resisting and high-temperature service.Most of thesegrades are commonly known as the“straight-chromium”typesand are characterized by being ferromagnetic.Two of thesegrades,TP410 and UNS S 41500(Table 1),are amenable tohardening by heat treatment,and the high-chromium,ferriticalloys are sensitive to notch-brittleness on slow cooling toordinary temperatures.These features should be recognized inthe use of these materials.Grade TP439 is used primarily forhot-water tank service and does not require post-weld heattreatment to prevent attack of the heat affected zone.1.2 An optional supplementary requirement is provided,andwhen desired,shall be so stated in the order.1.3 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.The inch-pound units shall apply unless the“M”designation of this specification is specified in the order.2.Referenced Documents2.1 ASTM Standards:3A480/A480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet,and StripA763 Practices for Detecting Susceptibility to IntergranularAttack in Ferritic Stainless SteelsA1016/A1016M Specification for General Requirements forFerritic Alloy Steel,Austenitic Alloy Steel,and StainlessSteel TubesE213 Practice for Ultrasonic Testing of Metal Pipe andTubingE273 Practice for Ultrasonic Testing of the Weld Zone ofWelded Pipe and Tubing3.Terminology3.1 Lot Definitions:3.1.1 For flange and flaring requirements,the term lotapplies to all tubes,prior to cutting,of the same nominal sizeand wall thickness that are produced from the same heat ofsteel.If final heat treatment is in a batch-type furnace,a lotshall include only those tubes of the same size and from thesame heat that are heat treated in the same furnace charge.Ifthe final heat treatment is in a continuous furnace,the numberof tubes of the same size and from the same heat in a lot shallbe determined from the size of the tubes as given in Table 2.3.1.2 For tensile and hardness test requirements,the term lotapplies to all tubes,prior to cutting,of the same nominaldiameter and wall thickness that are produced from the sameheat of steel.If final heat treatment is in a batch-type furnace,a lot shall include only those tubes of the same size and thesame heat that are heat treated in the same furnace charge.Ifthe final heat treatment is in a continuous furnace,a lot shallinclude all tubes of the same size and heat,heat treated in thesame furnace at the same temperature,time at heat,and furnacespeed.4.Ordering Information4.1 It is the responsibility of the purchaser to specify allrequirements that are necessary for material ordered under thisspecification.Such requirements may include,but are notlimited to,the following:4.1.1 Quantity(feet,metres,or number of lengths),4.1.2 Name of material(seamless or welded tubes),4.1.3 Grade(Table 1),4.1.4 Size(outside diameter and nominal wall thickness),1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel Tubular Products.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1944.Last previous edition approved in 2010 as A268/A268M 10.DOI:10.1520/A0268_A0268M-10R16.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-268 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 States1 TABLE 1 Chemical RequirementsGradeTP405TP410TP429TP430TP443TP4461TP4462A.TP409UNSDesignationS40500S41000S42900S43000S44300S44600S44600S40800S40900ElementComposition,%C,max0.080.1