1、Designation:A 270 02An American National StandardStandard Specification forSeamless and Welded Austenitic Stainless Steel SanitaryTubing1This standard is issued under the fixed designation A 270;the number immediately following the designation indicates the year oforiginal adoption or,in the case of
2、 revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope*1.1 This specification
3、 covers grades of seamless and weldedaustenitic stainless steel sanitary tubing intended for use in thedairy and food industry and having special surface finishes.Pharmaceutical quality may be requested,as a supplementaryrequirement.1.2 This specification covers tubes in sizes up to andincluding 12
4、in.(304.8 mm)in outside diameter.1.3 The values stated in inch-pound units are to be regardedas the standard.1.4 Optional supplementary requirements are provided,andwhen one or more of these are desired,each shall be so statedin the order.2.Referenced Documents2.1 ASTM Standards:A 262 Practices for
5、Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless Steels2A 1016/A 1016M Specification for General Requirementsfor Ferritic Alloy Steel,Austenitic Alloy Steel,and Stain-less Steel Tubes3A 480/A 480M Specification for General Requirements forFlat Rolled Stainless and Heat-Resis
6、ting Steel Plate,Sheet,and Strip2A 967 Specification for Chemical Passivation Treatmentsfor Stainless Steel Parts2E 527 Practice for Numbering Metals and Alloys(UNS)32.2ASME Standard:B46.1 Surface Texture(Surface Roughness,Waviness,andLay)42.3Other Standard:SAE J1086 Practice for Numbering Metals an
7、d Alloys(UNS)53.Terminology3.1 Definition:3.1.1 roughness average,Ra,narithmetic average surfaceroughness normally reported in microinches or microns;ameasurement of surface roughness usually performed by mov-ing a stylus in a straight line along the surface,although othermethods may be used.4.Order
8、ing Information4.1 Orders for material under this specification shouldinclude the following,as required,to describe the desiredmaterial adequately:4.1.1 Quantity(feet,metres,or number of lengths),4.1.2 Name of material(seamless or welded tubes),4.1.3 Size(outside diameter and average wall thickness)
9、,4.1.4 Length(specific or random),4.1.5 Surface finish(Section 14),4.1.6 Optional requirements(product analysis,see Section9;hydrostatic or nondestructive electric test,see Section11).4.1.7 Test report required(Certification Section of Specifi-cation A 1016/A 1016M),4.1.8 Specification designation,4
10、.1.9 Special requirements,and4.2 Any supplementary requirements.5.General Requirements5.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A 1016/A 1016M,unless otherwise providedherein.6.Manufacture6.1 The tubes shall b
11、e made by the seamless or weldedprocess.6.2 At the manufacturers option,tubing may be furnishedeither hot finished or cold finished.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 o
12、n Stainless and Alloy Steel Tubular Products.Current edition approved April 10,2002.Published May 2002.Originallypublished as A 270 44 T.Last previous edition A 270 01.2Annual Book of ASTM Standards,Vol 01.03.3Annual Book of ASTM Standards,Vol 01.01.4Available from ASME International,Three Park Aven
13、ue,New York,NY100165990.5Available from Society ofAutomotive Engineers,400 Commmonwealth Drive,Warrendale,PA 15096.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.7.Heat Tr
14、eatment7.1 All material shall be furnished in the heat-treatedcondition.The heat treatment procedure,except for N08926and N08367,shall consist of heating the material to a minimumtemperature of 1900F(1040C)and quenching in water orrapid cooling by other means.7.2 N08926 shall be heat-treated to a mi
15、nimum temperatureof 2010F 1100C followed by quenching in water or rapidlycooling by other means.UNS N08367 should be solutionannealed from 2025F(1107C)minimum followed by rapidquenching.8.Chemical Composition8.1 The steel shall conform to the requirements as tochemical composition as prescribed in T
16、able 1.9.Product Analysis9.1 When specified on the purchase order,a product analy-sis of either one billet(when seamless material is supplied)orone coil(when welded product is supplied),or from each oftwo finished tubes per heat shall be supplied.The productanalysis tolerance of Specification A 480/A 480M shall apply.9.2 If the analysis of one of these test specimens does notconform to the requirements specified,an analysis of twobillets or two lengths of flat-rolled stock from the same heat ora
