1、Designation: A 270 03a (Reapproved 2008)1Standard Specification forSeamless and Welded Austenitic and Ferritic/AusteniticStainless Steel Sanitary Tubing1This standard is issued under the fixed designation A 270; the number immediately following the designation indicates the year oforiginal adoption
2、or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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.1NOTEThe
3、 units statement in 1.3 was corrected editorially in October 2008.1. Scope1.1 This 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 surfa
4、ce finishes.Pharmaceutical quality may be requested, as a supplementaryrequirement.1.2 This specification covers tubes in sizes up to andincluding 12 in. (304.8 mm) in outside diameter.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathem
5、aticalconversions to SI units that are provided for information onlyand are not considered 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:2A 262 Practices for Detec
6、ting Susceptibility to Intergranu-lar Attack in Austenitic Stainless SteelsA 480/A 480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet, and StripA 923 Test Methods for Detecting Detrimental IntermetallicPhase in Duplex Austenitic/Ferritic Stainle
7、ss SteelsA 967 Specification for Chemical Passivation Treatmentsfor Stainless Steel PartsA 1016/A 1016M Specification for General Requirementsfor Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-less Steel TubesE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS
8、)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 avera
9、ge 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 allrequirem
10、ents 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 work
11、ed (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),4.1.7 Optional requirements (product analysis, see Section9; hydrostatic or nondestructive electric test, see Section11).4.1.8 Test report required (Certification Sec
12、tion of Specifi-cation A 1016/A 1016M),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 Oct. 1, 2008. Published
13、 January 2009. Originallyapproved in 1944. Last previous edition approved in 2003 as A 27003a.2For 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
14、 Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/
15、www.sae.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.9 Specification designation,4.1.10 Special requirements, and4.2 Any supplementary requirements.5. General Requirements5.1 Material furnished under this specification sha
16、ll con-form to the applicable requirements of the current edition ofSpecification A 1016/A 1016M, unless otherwise providedherein.6. Manufacture6.1 The tubes shall be manufactured by one of the followingprocesses:6.1.1 Seamless (SML) tubes shall be made by a process thatdoes not involve welding at a
17、ny 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 working of not less than 35 % reduction ofthickness of both wall and weld to a welded tub
18、e 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 Vessel Code Section VIII, Division 1, latestrevision, Paragraph UW 51.6.2 At the manufacturers
19、 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, S32205, S32750, N08926 and N08367, shall consistof heating the material to a minimum tempera
20、ture of 1900 F(1040 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 means. UNS N08367 should besolution annealed from 2025 F (1107 C) minimum followedby rapi
21、d 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 temperature range of1880 F (1025 C) to 2060 F (1125 C) followed byquenching in w
22、ater 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 be made for each heat. The chemical composi-tion thus determined shall
23、 conform to the requirements given inTable 1.9. Product Analysis9.1 When requested by the purchaser, product analysistolerance in Specification A 480/A 480M shall apply. Theproduct analysis tolerance is not applicable to the carboncontent for material with a specified maximum carbon of0.04 % or less
24、.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; otherwise all remainingmaterial in the heat or lot (Note 1) shall be rejected
25、or, at theoption of the producer, each length of flat-rolled stock or tubemay be individually tested for acceptance. Lengths of flatrolled stock or tubes that do not meet the requirements of thespecification shall be rejected.10. Mechanical Tests Required10.1 Reverse Flattening TestFor welded tubes,
26、 one re-verse flattening test shall be made on a specimen from each1500 ft (457 m) of finished tubing.11. Hydrostatic or Nondestructive Electric Test11.1 Each tube shall be subjected to the nondestructiveelectric test or the hydrostatic test. The type of test to be usedshall be at the option of the
27、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, variations in outside diameter fromthose specified shall n
28、ot 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. (101.6 mm) outside diameter isordered, additional ovality may be re
29、quired for thin walltubing. Thin wall tubing applies when the specified wall is lessthan 0.150 in. (3.81 mm). When thin wall tubing is ordered, themaximum and minimum outside diameter at any cross sectionshall deviate from the specified outside diameter by no morethan twice the permissible variation
30、 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 Variations in length shall meet the requirements
31、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 to smooth the surface.13.1.2 Mechanically Polished
32、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.A 270 03a (2008)12TABLE 1 Chemical RequirementsElement Grade TP 304 T
33、P 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 maxManganese,max2.00 2.00 1.00 2.00 2.00 2.00 2.00 2.00 2
34、.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 8.011.0 8.012.0 17.518.5 10.014.0 10.014.0 24
35、.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. . . . . . 0.180.22 . . . . . . 0.150.25 0.180.25 0
36、.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 E 527 and SAE J 1086.BFor small diameter or thin walls or both, where many drawing passes are required, a carbon maximum of 0.040 % is neces
37、sary in grades TP304L and TP316L. Small outside diameter tubes are defined as thoseless than 0.500 in. (12.7 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 thickness).CThe method of analysis for nitro
38、gen shall be a matter of agreement between the purchaser and manufacturer.A27003a(2008)1313.1.2.2 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 bypolishing a tube with an abrasive media im
39、pregnated 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 Electropolished FinishA bright reflective fi
40、nishproduced 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 of surfaceroughness shall be in acc
41、ordance 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 the specified finish. The operation
42、s 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.13.2.1.2 Circumferential (Rotary) Polish
43、ed 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 alongitudinal mechanical polished surface shal
44、l 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 surfaces may be specified. When tubes are
45、 polished onone surface only, the other surface may be the regular millfinish.14. Product Marking14.1 In addition to the marking prescribed in SpecificationA 1016/A 1016M and specified in the order, the marking shallinclude whether the tubing is seamless (SML), welded (WLD),or heavily cold worked (H
46、CW), 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 stainless steel; ferritic/austeni
47、tic stainless steel; heavily cold worked tube; seamlesssteel tube; stainless steel tube; steel tube; welded steel tubeTABLE 2 Permissible Variations in DimensionsSize, OutsideDiameter,in. (mm)Permissible Variations in OutsideDiameter, in. (mm)Permissible Variations in CutLength, in. (mm)AOver Under
48、Over Under1.000 (25.4) and under 0.005 (0.13) 0.005 (0.13)18 (3.2) 0Over 1 (25.4) to 2 (50.8) 0.008 (0.20) 0.008 (0.20)18 (3.2) 0Over 2 (50.8) to 3 (76.2) 0.010 (0.25) 0.010 (0.25)18 (3.2) 0Over 3 (76.2) to 4 (101.6) 0.015 (0.38) 0.015 (0.38)18 (3.2) 0Over 4 (101.6) to 512 (139.7), excl 0.015 (0.38)
49、 0.015 (0.38)316 (4.8) 0512 (139.7) to 8 (203.2), excl 0.030 (0.76) 0.030 (0.76)316 (4.8) 08 (203.2) to 12 (304.8) 0.050 (1.27) 0.050 (1.27)316 (4.8) 0AThe cut tolerances do not apply to Pharmaceuitical Tubing in S2 (see paragraph S2.7).A 270 03a (2008)14SUPPLEMENTARY 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, intergranular corrosiontests
