1、Designation: A270/A270M 10Standard Specification forSeamless and Welded Austenitic and Ferritic/AusteniticStainless Steel Sanitary Tubing1This standard is issued under the fixed designation A270/A270M; the number immediately following the designation indicates the yearof original adoption or, in the
2、 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 Department of Defense.1. Scope*1.1 This
3、specification covers grades of seamless, welded,and heavily cold worked welded austenitic and ferritic/austenitic 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.
4、1.2 This specification covers tubes in sizes up to andincluding 12 in. 300 mm in outside diameter.1.3 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, eachsystem shall be used i
5、ndependently of the other. Combiningvalues from the two systems may result in non-conformancewith 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:2A262 Practices
6、 for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA480/A480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet, and StripA923 Test Methods for Detecting Detrimental IntermetallicPhase in Duplex Austenitic/Ferritic St
7、ainless SteelsA967 Specification for Chemical Passivation Treatmentsfor Stainless Steel PartsA1016/A1016M Specification for General Requirementsfor Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-less Steel TubesE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UN
8、S)2.2 ASME Standard:B46.1 Surface Texture (Surface Roughness, Waviness, andLay)32.3 ASME Boiler and Pressure Vessel Code:Section VIII Pressure Vessels32.4 Other Standard:SAE J1086 Practice for Numbering Metals and Alloys(UNS)43. Terminology3.1 Definition:3.1.1 roughness average, Ra, narithmetic aver
9、age 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. Ordering Information4.1 It is the responsibility of the purchaser to specify allrequire
10、ments 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 (austenitic steel tube),4.1.3 Process seamless (SML), welded (WLD), or heavilycold wor
11、ked (HCW),4.1.4 Size (outside diameter and average wall thickness),4.1.5 Length (specific or random),4.1.6 Surface finish (Section 13),1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.1
12、0 on Stainless and Alloy Steel Tubular Products.Current edition approved April 1, 2010. Published May 2010. Originallyapproved in 1944. Last previous edition approved in 2008 as A27003a(2008)1.DOI: 10.1520/A0270-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
13、Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/w
14、ww.asme.org.4Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.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,
15、United States.4.1.7 Optional requirements (product analysis, see Section9; hydrostatic or nondestructive electric test, see Section 11).4.1.8 Test report required (Certification Section of Specifi-cation A1016/A1016M),4.1.9 Specification designation,4.1.10 Special requirements, and4.2 Any supplement
16、ary requirements.5. General Requirements5.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A1016/A1016M, unless otherwise providedherein.6. Manufacture6.1 The tubes shall be manufactured by one of the followingprocesse
17、s:6.1.1 Seamless (SML) tubes shall be made by a process thatdoes not involve welding at any stage.6.1.2 Welded (WLD) tubes shall be made using an auto-mated welding process with no addition of filler metal duringthe welding process.6.1.3 Heavily cold worked (HCW) tubes shall be made byapplying cold
18、working of not less than 35 % reduction ofthickness of both wall and weld to a welded tube prior to thefinal anneal. No filler shall be used in making the weld. Priorto cold working, the weld shall be 100 % radiographicallyinspected in accordance with the requirements ofASME Boilerand Pressure Vesse
19、l Code Section VIII, Division 1, latestrevision, Paragraph UW 51.6.2 At the manufacturers option, tubing may be furnishedeither hot finished or cold finished.7. Heat Treatment7.1 All material shall be furnished in the heat-treatedcondition. The heat treatment procedure, except for S31803,S32003, S32
20、205, S32750, N08926 and N08367, shall consistof heating the material to a minimum temperature of 1900 F1040 C and quenching in water or rapid cooling by othermeans.7.2 N08926 shall be heat-treated to a minimum temperatureof 2010 F 1100 C followed by quenching in water orrapidly cooling by other mean
21、s. UNS N08367 should besolution annealed from 2025 F 1110 C minimum followedby rapid quenching.7.3 S31803 and S32205 shall be heat-treated in a tempera-ture range of 1870 F 1020 C to 2010 F 1100 C followedby quenching in water or rapidly cooling by other means.7.4 S32750 shall be heat-treated in a t
22、emperature range of1880 F 1025 C to 2060 F 1125 C followed byquenching in water or rapidly cooling by other means.7.5 S32003 shall be heat-treated in a temperature range of1850 F 1010 C to 2010 F 1100 C.8. Chemical Composition8.1 An analysis of either one length of flat-rolled stock orone tube shall
23、 be made for each heat. The chemical composi-tion thus determined shall conform to the requirements given inTable 1.9. Product Analysis9.1 When requested by the purchaser, product analysistolerance in Specification A480/A480M shall apply. The prod-uct analysis tolerance is not applicable to the carb
24、on content formaterial with a specified maximum carbon of 0.04 % or less.9.2 If the original test for product analysis fails, retests oftwo additional lengths of flat-rolled stock or tubes shall bemade. Both retests for the elements in question shall meet therequirements of the specification; otherw
25、ise all remainingmaterial in the heat or lot shall be rejected or, at the option ofthe producer, each length of flat-rolled stock or tube may beindividually tested for acceptance. Lengths of flat rolled stockor tubes that do not meet the requirements of the specificationshall be rejected.10. Mechani
26、cal Tests Required10.1 Reverse Flattening TestFor welded tubes, one re-verse flattening test shall be made on a specimen from each1500 ft 450 m of finished tubing.11. Hydrostatic or Nondestructive Electric Test11.1 Each tube shall be subjected to the nondestructiveelectric test or the hydrostatic te
27、st. The type of test to be usedshall be at the option of the manufacturer, unless otherwisespecified in the purchase order.12. Permissible Variations in Dimensions12.1 The following variations in dimensions shall apply:12.1.1 For tubes with a specified wall thickness of 0.049 in.1.24 mm and greater,
28、 variations in outside diameter fromthose specified shall not exceed the amount prescribed in Table2. For tubes with a specified wall thickness less than 0.049 in.1.24 mm, the diameter tolerances shall be a matter foragreement by the manufacturer and the purchaser.12.1.2 When tubing 4 in. 100 mm out
29、side diameter isordered, additional ovality may be required for thin walltubing. Thin wall tubing applies when the specified wall is lessthan 0.150 in. 3.8 mm. When thin wall tubing is ordered, themaximum and minimum outside diameter at any cross sectionshall deviate from the specified outside diame
30、ter by no morethan twice the permissible variation in outside diameter givenin Table 2; however, the mean diameter at that cross sectionmust still be within the given permissible variation.12.1.3 The wall thickness at any point shall not vary morethan 12.5 %, from the specified wall thickness.12.1.4
31、 Variations in length shall meet the requirements inTable 2 except when the Pharmaceutical Quality Tubing(Supplementary Requirement S2) is specified.13. Surface Finishes13.1 The following surface finishes may be specified:13.1.1 Mill FinishAfinish without additional polishing oroperations intended t
32、o smooth the surface.13.1.2 Mechanically Polished Surface FinishThe pur-chaser may specify one of the following finish numbers for amechanically polished surface:13.1.2.1 Finish No. 80A ground finish produced by pol-ishing a tube with an abrasive media impregnated with No. 80grit.A270/A270M 102TABLE
33、 1 Chemical RequirementsElement Grade TP 304 TP 304L . . . TP 316 TP 316L . . . . . . . . . . . . . . . 2003UNSDesignationAS30400 S30403 S31254 S31600 S31603 N08926 N08367 S31803 S32205 S32750 S32003Composition, %Carbon, max 0.08 0.035B0.020 0.08 0.035B0.020 0.030 0.030 0.030 0.030 0.030 maxManganes
34、e,max2.00 2.00 1.00 2.00 2.00 2.00 2.00 2.00 2.00 1.20 2.00 maxPhosphorus,max0.045 0.045 0.030 0.045 0.045 0.030 0.040 0.030 0.030 0.035 0.030Sulfur, max 0.030 0.030 0.010 0.030 0.030 0.010 0.030 0.020 0.020 0.020 0.020 maxSilicon, max 1.00 1.00 0.80 1.00 1.00 0.50 1.00 1.00 1.00 0.80 1.00 maxNickel
35、 8.011.0 8.012.0 17.518.5 10.014.0 10.014.0 24.026.0 23.525.5 4.56.5 4.56.5 6.08.0 3.04.0Chromium 18.020.0 18.020.0 19.520.5 16.018.0 16.018.0 19.021.0 20.022.0 21.023.0 22.023.0 24.026.0 19.522.5Molybdenum . . . . . . 6.06.5 2.003.00 2.003.00 6.07.0 6.07.0 2.53.5 3.03.5 3.05.0 1.52.0NitrogenC. . .
36、. . . 0.180.22 . . . . . . 0.150.25 0.180.25 0.080.20 0.140.20 0.240.32 0.140.20Copper . . . . . . 0.501.00 . . . . . . 0.501.5 0.75 max . . 0.50 maxANew designation established in accordance with Practice E527 and SAE J 1086.BFor small diameter or thin walls or both, where many drawing passes are r
37、equired, a carbon maximum of 0.040 % is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as thoseless than 0.500 in. 12 mm in outside diameter and light wall tubes as those less than 0.049 in. 1.24 mm in average wall thickness (0.044 in. 1.12 mm in minimum wall thickne
38、ss).CThe method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer.A270/A270M10313.1.2.2 Finish No. 120A ground finish produced bypolishing a tube with an abrasive media impregnated with No.120 grit.13.1.2.3 Finish No. 180A ground finish produced bypolishi
39、ng a tube with an abrasive media impregnated with No.180 grit.13.1.2.4 Finish No. 240A ground finish produced bypolishing a tube with an abrasive media impregnated with No.240 grit.13.1.2.5 Other mechanically polished finishes may beagreed upon between the purchaser and manufacturer.13.1.3 Electropo
40、lished FinishA bright reflective finishproduced by electropolishing. The manufacturer may use otherpolishing operations prior to electropolishing.13.1.4 Maximum Roughness Average (Ra) Surface FinishThe customer may specify a maximum Ra on the insidesurface, outside surface, or both. The measurement
41、of surfaceroughness shall be in accordance with ASME B46.1.13.1.4.1 When no agreement is made regarding Ra mea-surement of longitudinally polished tube, disputes shall beresolved using measurements made in accordance with ASMEB46.1.13.2 The manufacturer shall select a manufacturing methodto produce
42、the specified finish. The operations may or may notinclude polishing.13.2.1 The purchaser may specify the polishing type foreither the inside surface, outside surface or both for the finaldesired effect.13.2.1.1 Longitudinally Polished Finish It is usually per-formed on the inside surface only.13.2.
43、1.2 Circumferential (Rotary) Polished FinishThiscan be performed on either the inside surface, outside surface,or both.13.2.1.3 When the surface is finished by circumferentialmechanical polishing, the Ra measurement shall be measuredin the longitudinal direction. Roughness measurement of alongitudin
44、al mechanical polished surface shall be a matter ofagreement between the manufacturer and the purchaser.13.3 Acceptance criteria for minor surface imperfectionsshall be a matter for agreement by the manufacturer and thepurchaser.13.4 Combinations of the above finishes for internal andexternal surfac
45、es may be specified. When tubes are polishedonly on one surface, the other surface may be the regular millfinish.14. Product Marking14.1 In addition to the marking prescribed in SpecificationA1016/A1016M and specified in the order, the marking shallinclude whether the tubing is seamless (SML), welde
46、d (WLD),or heavily cold worked (HCW), and the surface finish.15. Packaging15.1 Unless otherwise specified in the order, all tubing shallbe protected for shipment by bundling, paper or burlapwrapping, or boxing at the discretion of the manufacturer.16. Keywords16.1 austenitic stainless steel; duplex
47、stainless steel; ferritic/austenitic stainless steel; heavily cold worked tube; seamlesssteel tube; stainless steel tube; steel tube; welded steel tubeTABLE 2 Permissible Variations in DimensionsSize, OutsideDiameter,in. mmPermissible Variations in OutsideDiameter, in. mmPermissible Variations in Cu
48、tLength, in. mmAOver Under Over Under1.000 25 and under 0.005 0.13 0.005 0.1318 3 0Over 1 25 to 2 50 0.008 0.20 0.008 0.2018 3 0Over 2 50 to 3 75 0.010 0.25 0.010 0.2518 3 0Over 3 75 to 4 100 0.015 0.38 0.015 0.3818 3 0Over 4 100 to 512 140, excl 0.015 0.38 0.015 0.38316 5 0512 140 to 8 200, excl 0.
49、030 0.75 0.030 0.75316 5 08 200 to 12 300 0.050 1.25 0.050 1.25316 5 0AThe cut tolerances do not apply to Pharmaceuitical Tubing in S2 (see paragraph S2.7).A270/A270M 104SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser in theinquiry, contract, or order.S1. Intergranular Corrosion TestS1.1 When specified on the order, intergra
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