ASTM A 268／A 268M-05a一般设备用无缝和焊接铁素体与马氏体不锈钢管

Designation:A 268/A 268M –05aStandard Specification forSeamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service 1This standard is issued under the fixed designation A 268/A 268M;the number immediately following the designation indicates the year of 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 (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*1.1This specification 2covers a number of grades of nominal-wall-thickness,stainless steel tubing for general corrosion-resisting and high-temperature service.Most of these grades are commonly known as the “straight-chromium”types and are characterized by being ferromagnetic.Two of these grades,TP410and UNS S 41500(Table 1),are amenable to hardening by heat treatment,and the high-chromium,ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures.These features should be recognized in the use of these materials.Grade TP439is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone.1.2An optional supplementary requirement is provided,and when desired,shall be so stated in the order.1.3The values stated in either inch-pound units or SI units are to be regarded separately as standard.Within the text,the SI units are shown in brackets.The values stated in each system are not exact equivalents;therefore,each system must be used independently of the bining values from the two 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 Documents 2.1ASTM Standards:3A 480/A 480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet,and StripA 763Practices for Detecting Susceptibility to Intergranu-lar Attack in Ferritic Stainless SteelsA 1016/A 1016M Specification for General Requirements for Ferritic Alloy Steel,Austenitic Alloy Steel,and Stain-less Steel TubesE 213Practice for Ultrasonic Examination of Metal Pipe and TubingE 273Practice for Ultrasonic Examination of the Weld Zone of Welded Pipe and Tubing3.Terminology3.1Lot Definitions :3.1.1For flange and flaring requirements,the term lot applies to all tubes,prior to cutting,of the same nominal size and wall thickness that are produced from the same heat of steel.If final heat treatment is in a batch-type furnace,a lot shall include only those tubes of the same size and from the same heat that are heat treated in the same furnace charge.If the final heat treatment is in a continuous furnace,the number of tubes of the same size and from the same heat in a lot shall be determined from the size of the tubes as given in Table 2.3.1.2For tensile and hardness test requirements,the term lot applies to all tubes,prior to cutting,of the same nominal diameter and wall thickness that are produced from the same heat of steel.If final heat treatment is in a batch-type furnace,a lot shall include only those tubes of the same size and the same heat that are heat treated in the same furnace charge.If the final heat treatment is in a continuous furnace,a lot shall include all tubes of the same size and heat,heat treated in the same furnace at the same temperature,time at heat,and furnace speed.4.Ordering Information4.1It is the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this specification.Such requirements may include,but are not limited to,the following:4.1.1Quantity (feet,metres,or number of lengths),4.1.2Name of material (seamless or welded tubes),4.1.3Grade (Table 1),4.1.4Size (outside diameter and nominal wall thickness),1This specification is under the jurisdiction of ASTM Committee A01on Steel,Stainless Steel,and Related Alloys and is the direct responsibility of Subcommittee A01.10on Stainless and Alloy Steel Tubular Products.Current edition approved September 1,2005.Published September 2005.Originally approved in st previous edition approved in 2005as A 268/A 268M –05.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-268in Section II of that Code.3For referenced ASTM standards,visit the ASTM website,,or contact ASTM Customer Service at service@.For Annual Book of ASTM Standards volume information,refer to the standard’s Document Summary page on the ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.巴巴客 免费下载标准T A B L E 1C h e m i c a l R e q u i r e m e n t sG r a d e T P 405T P 410T P 429T P 430T P 443T P 446–1T P 446–2A ...T P 409U N S D e s i g n a t i o nS 40500S 41000S 42900S 43000S 44300S 44600S 44600S 40800S 40900E l e m e n tC o m p o s i t i o n ,%C ,m a x 0.080.150.120.120.200.200.120.080.08M n ,m a x 1.001.001.001.001.001.501.501.001.00P ,m a x 0.0400.0400.0400.0400.0400.0400.0400.0450.045S ,m a x 0.0300.0300.0300.0300.0300.0300.0300.0450.030S i ,m a x 1.001.001.001.001.001.001.001.001.00N i 0.50m a x .........0.75m a x 0.75m a x 0.50m a x 0.80m a x 0.50m a x C r 11.5–14.511.5–13.514.0–16.016.0–18.018.0–23.023.0–27.023.0–27.011.5–13.010.5–11.7M o ...........................A l 0.10–0.30........................C u ............0.90–1.25............N ...............0.250.25......T i .....................123C m i n ;63C m i n ;1.10m a x 0.75m axA 268/A 268M –05a2巴巴客 免费下载标准T A B L E 1C o n t i n u e dG r a d e T P 439......T P 430T i T P X M -27T P X M -33A 18C r -2M o29-429-4-226-3-325-4-4...............T P 468U N S D e s i g n a t i o nS 43035S 43932S 41500BS 43036S 44627S 44626S 44400S 44700S 44800S 44660S 44635S 44735S 32803S 40977S 43940S 42035S 46800E l e m e n tC o m p o s i t i o n ,%C ,m a x 0.070.0300.050.100.01A 0.060.0250.0100.0100.0300.0250.0300.015C 0.030.030.080.030M n ,m a x 1.001.000.5–1.01.000.400.751.000.300.301.001.001.000.51.501.001.001.00P ,m a x 0.0400.0400.030.0400.020.0400.0400.0250.0250.0400.0400.0400.0200.0400.0400.0450.040S ,m a x 0.0300.0300.030.0300.020.0200.0300.0200.0200.0300.0300.0300.0050.0150.0150.0300.030S i ,m a x 1.001.000.601.000.400.751.000.200.201.000.751.000.501.001.001.001.00N i 0.50m a x 0.503.5–5.50.75m a x 0.5D m a x 0.50m a x 1.00m a x 0.15m a x 2.0–2.51.0–3.503.5–4.51.00m a x 3.0–4.00.30–1.00...1.0–2.50.50C r17.00–17.0–19.011.5–14.016.00–25.0–27.525.0–27.017.5–19.528.0–30.028.0–30.025.0–28.024.5–26.028.00–28.0–29.010.50–12.5017.50–18.5013.5–15.518.00–20.0019.0019.5030.00M o ......0.5–1.0...0.75–1.500.75–1.501.75–2.503.5–4.23.5–4.23.0–4.03.5–4.53.60–4.201.8–2.5......0.2–1.2...A l ,m a x 0.150.15.............................................C u ,m a x ............0.20.20...0.150.15........................N ,m a x0.040.030(T i +C b ){0.20+4(C +N )}m i n .;0.75m a x ......0.0150.0400.0350.020E0.020E 0.0400.0350.0450.0200.030......0.030T i0.20+4(C ...53C m i n ;...73(C +N )(T i +C b )......(T i +C b )=(T i +C b )=(T i +C b )=......0.10–0.600.30–0.500.07–0.30+N )m i n ;0.75m a xb u t n o l e s s0.20+40.20–1.000.20+40.20–1.001.10m a xt h a n 0.20(C +N )a n d 63(C +N )a n d 63m i n ;1.00m i n ;0.80(C +N )m i n t o(C +N )m a xm a x m i n0.80m a xm i nC b .........0.05–0.20.....................0.15–0.50F ...(33%C +0.30)m i n...0.10–0.60(T i +C b )=0.20+4(C +N )m i n ;0.80m a xAF o r s m a l l d i a m e t e r o r t h i n w a l l s ,o r b o t h ,t u b i n g ,w h e r e m a n y d r a w i n g p a s s e s a r e r e q u i r e d ,a c a r b o n m a x i m u m o f 0.015%i s n e c e s s a r y .S m a l l o u t s i d e d i a m e t e r t u b e s a r e d e fin e d a s t h o s e l e s s t h a n 0.500i n .[12.7m m ]i n o u t s i d e d i a m e t e r a n d l i g h t w a l l t u b e s a s t h o s e l e s s t h a n 0.049i n .[1.2m m ]i n a v e r a g e w a l l t h i c k n e s s (0.040i n .[1m m ]i n m i n i m u m w a l l t h i c k n e s s ).B P l a t e v e r s i o n o f C A 6N M .C C a r b o n p l u s n i t r o g e n =0.30m a x .D N i c k e l p l u s c o p p e r .E C a r b o n p l u s n i t r o g e n =0.025%m a x .F C b /(C +N )=12m i n.A 268/A 268M –05a3巴巴客 免费下载标准4.1.5Length(specific or random),4.1.6Optional requirements(hydrostatic or nondestructive electric test,Section16),4.1.7Test report required(Certification Section of Specifi-cation A1016/A1016M),4.1.8Specification designation,4.1.9Intergranular corrosion test,and4.1.10Special requirements.5.General Requirements5.1Material furnished under this specification shall con-form to the applicable requirements of Specification A1016/ A1016M unless otherwise provided herein.6.Manufacture6.1The tubes shall be made by the seamless or welded process with nofiller metal added.7.Heat Treatment7.1As afinal heat treatment,tubes shall be reheated to a temperature of1200°F[650°C]or higher and cooled(as appropriate for the grade)to meet the requirements of this specification.7.2The martensitic grade UNS S41500shall be reheated toa temperature of950°F[510°C]or higher and cooled as appropriate to meet the requirements of this specification. 8.Chemical Composition8.1The steel shall conform to the chemical requirements prescribed in Table1.9.Product Analysis9.1An analysis of either one billet or one length offlatrolled stock or one tube shall be made from each heat.The chemical composition thus determined shall conform to the requirements specified.9.2The product analysis tolerance of the Chemical Require-ments Table of A480/A480M shall apply.The product analy-sis tolerance is not applicable to the carbon content for material with a specified maximum carbon of0.04%or less.9.3If the original test for product analysis fails,retests of two additional billets,lengths offlat-rolled stock or tubes shall be made.Both retests for the elements in question shall meet the requirements of the specification;otherwise all remaining material in the heat or lot shall be rejected or,at the option of the producer,each billet or tube may be individually tested for acceptance.Billets,lengths offlat-rolled stock or tubes which do not meet the requirements of the specification shall be rejected.10.Tensile Requirements10.1The material shall conform to the tensile properties prescribed in Tables3and4.11.Hardness Requirements11.1The tubes shall have a hardness number not to exceed those prescribed in Table5.TABLE2Number of Tubes in a Lot Heat Treated by theContinuous ProcessSize of Tube Size of Lot2in.[50.8mm]and over in outside diameter and0.200in.[5.1mm]and over in wall thicknessnot more than50tubesLess than2in.[50.8mm]but over1in.[25.4mm]in outside diameter or over1in.[25.4mm]inoutside diameter and under0.200in.[5.1mm]inwall thicknessnot more than75tubes 1in.[25.4mm]or less in outside diameter not more than125tubesTABLE3Tensile RequirementsGrade and UNS DesignationTensilestrength,min,ksi[MPa]Yieldstrength,min,ksi[MPa]Elongation A,Bin2in.or50mm,min,% TP405S4050060[415]30[205]20...S4080055[380]30[205]20TP410S4100060[415]30[205]20TP429,TP430,and TP430TiS429000,S43000,and S4303660[415]35[240]20TP443S4430070[485]40[275]20TP446-1S4460070[485]40[275]18TP446-2S4460065[450]40[275]20TP409S4090055[380]25[170]20TP439S4303560[415]30[205]20S4393260[415]30[205]20 ...S41500115[795]90[620]15TPXM-27S4462765[450]40[275]20TPXM-33S4462668[470]45[310]2018Cr-2MoS4440060[415]40[275]2029-4and29-4-2S44700and S4480080[550]60[415]2026-3-3S4466085[585]65[450]2025-4-4S4463590[620]75[515]20...S4473575[515]60[415]1828-2-3.5S3280387[600]72[500]16S4097765[450]41[280]18S4394062[430]36[250]18S4203580[550]55[380]16TP468S4680060[415]30[205]22A For tubing smaller than1⁄2in.[12.7mm]in outside diameter,the elongation values given for strip specimens in Table2shall apply.Mechanical property requirements do not apply to tubing smaller than1⁄8in.[3.2mm]in outside diameter or with walls thinner than0.015in.[0.4mm].B For longitudinal strip tests a deduction of0.90%for TP446–1and S44735 and1.00%for all other grades shall be made from the basic minimum elongation foreach1⁄32in.[0.8mm]decrease in wall thickness below5⁄16in.[8mm].The following table gives the computed minimum values:A268/A268M–05a4巴巴客 免费下载标准12.Permissible Variations in Dimensions12.1Variations in outside diameter,wall thickness,and length from those specified shall not exceed the amounts prescribed in Table 6.12.2The permissible variations in outside diameter given in Table 6are not sufficient to provide for ovality in thin-walled tubes,as defined in the Table.In such tubes,the maximum and minimum diameters at any cross section shall deviate from the nominal diameter by no more than twice the permissible variation in outside diameter given in Table 6;however,the mean diameter at that cross section must still be within the given permissible variation.12.3When the specified wall is 2%or less of the specified outside diameter,the method of measurement is in accordance with the agreement between the purchaser and the manufac-turer (see Note 1).N OTE 1—Very thin wall tubing may not be stiff enough for the outside diameter to be accurately measured with a point contact test method,such as with the use of a micrometer or caliper.When very thin walls are specified,“go”–“no go”ring gages are commonly used to measure diameters of 11⁄2in.[38.1mm]or less.A0.002-in.[0.05-mm]additional tolerance is usually added on the “go”ring gage to allow clearance for sliding.On larger diameters,measurement is commonly performed with a pi tape.Other test methods such as optical test methods may also be considered.13.Surface Condition13.1All tubes shall be free of excessive mill scale,suitable for inspection.A slight amount of oxidation will not be considered as scale.Any special finish requirements shall be subject to agreement between the manufacturer and the pur-chaser.14.Mechanical Tests Required14.1Tension Tests —One tension test shall be made on a specimen for lots of not more than 50tubes.Tension tests shall be made on specimens from two tubes for lots of more than 50tubes.14.2Flaring Test (for Seamless Tubes)—One test shall be made on specimens from one end of one tube from each lot of finished tubes.The minimum expansion of the inside diameter shall be 10%.For tubes over 8in.[203.2mm]in outside diameter,or tubes with wall thickness 3⁄8in.[9.52mm]and over,the flattening test may be performed instead of the flaring test unless the flaring test is specified in the purchase order.14.3Flange Test (for Welded Tubes)—One test shall be made on specimens from one end of one tube from each lot of finished tubes.For tubes over 8in.[203.2mm]in outside diameter,or tubes with wall thickness 3⁄8in.[9.52mm]and over,the flattening test may be performed instead of the flange test unless the flange test is specified in the purchase order.14.4Hardness Test —Brinell or Rockwell hardness tests shall be made on specimens from two tubes from each lot.14.5When more than one heat is involved,the tension,flaring,flanging,and hardness test requirements shall apply to each heat.14.6Reverse Flattening Test —For welded tubes,one re-verse flattening test shall be made on a specimen from each 1500ft [450m]of finished tubing.15.Intergranular Corrosion Test15.1If intergranular corrosion testing is specified in the purchase order,the test shall be made in accordance withTABLE 4Minimum Elongation ValuesWall ThicknessElongation A in 2in.or 50mm,min,%in.mm TP446–1and S 44735S41500All Other Grades 5⁄16[0.312]81815209⁄32[0.281]7.21714191⁄4[0.250] 6.41614187⁄32[0.219] 5.61513173⁄16[0.188] 4.81412165⁄32[0.156]41311151⁄8[0.125] 3.21311143⁄32[0.094] 2.41210131⁄16[0.062]1.6119120.062–0.035,excl 1.6–0.9108120.035–0.022,excl 0.9–0.6108110.022–0.015,incl0.6–0.410811ACalculated elongation requirements shall be rounded to the nearest whole number.Note—The above table gives the computed minimum values for each 1⁄32in.[0.8mm]decrease in wall thickness.Where the wall thickness lies between two values shown above,the minimum elongation value shall be determined by the following equation:GradeEquationTP446–1and S 44735E =28.8t +9.00[E =1.13t +9.00]S41500E =24t +7.5All other gradesE =32t +10.00[E =1.25t +10.00]where:E =elongation in 2in.or 50mm,%.t =actual thickness of specimen,in.[mm].TABLE 5Hardness Requirements.GradeUNS Designation Brinell Hardness,max Rockwell Hardness,B Scale,maxTP405S4050020795...S4080020795TP410S4100020795TP429,TP430,and TP430TI S42900,S 43000,and S 4303619090TP443S4430020795TP446-1and TP446-2S4460020795TP409S4090020795TP439S43035A 19090S4393219090...S4*******B 32TPXM-33and TPXM-27S44626and S4462724110018CR-2MoS444002179529-4and 29-4-2S44700and S4480020710026-3-3S4466026525B 25-4-4S4463527027B ...S44735...10028-2-3.5S32803240100...S4*******88...S4394018088...S4203518088A Editorially corrected October 2000.BRockwell hardness,C scale.A 268/A 268M –05a5巴巴客 免费下载标准Practices A 763,using samples prepared as agreed upon between the seller and the purchaser.16.Hydrostatic or Nondestructive Electric Test16.1Each tube,seamless or welded,shall be subjected to the nondestructive electric test or the hydrostatic test.The type of test to be used shall be at the option of the manufacturer,unless otherwise specified in the purchase order.17.Product Marking17.1In addition to the marking described in Specification A 1016/A 1016M ,the marking shall indicate whether the tubing is seamless or welded.18.Keywords18.1ferritic stainless steel;seamless steel tube;stainless steel tube;steel tube;welded steel tubeSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser in the inquiry,contract,or order.S1.Air-Underwater Pressure TestS1.1When specified,the tubing shall be examined by the air underwater pressure test.S2.Additional Testing of Welded Tubing for 100%JointEfficiency in Certain ASME Applications (see Note S2.1)N OTE S2.1—When specified,the special testing in this supplement is intended for special ASME applications.It is not mandatory for all ASME applications.S2.1Where this supplement is specified in the purchase order,in certain ASME applications it is permissible to use 100%joint efficiency for the longitudinal weld,provided the following additional requirements are met:S2.1.1Each tube shall be subjected to an ultrasonic inspec-tion employing Practices E 273or E 213with the rejection criteria referenced in Specification A 1016/A 1016M .S2.1.2If Practice E 273is employed,a 100%volumetric inspection of the entire length of each tube shall also be performed using one of the non-destructive electric tests permitted by Specification A 1016/A 1016M .S2.1.3The test methods described in the supplement may not be capable of inspecting the end portions of tubes.This condition is referred to as end effect.This portion,as deter-mined by the manufacturer,shall be removed and discarded.S2.1.4In addition to the marking prescribed in Specification A 1016/A 1016M ,“S2”shall be added after the grade designation.TABLE 6Permissible Variations in DimensionsGroup Size,Outside Diameter,in.[mm]Permissible Vari-ations in OutsideDiameter,in.[mm]Permissible Variations in Wall Thickness,A %Permissible Variations in CutLength,in.B [mm]Thin-Walled Tubes C OverUnder 1Up to 1⁄2[12.7],excl 60.005[0.13]6151⁄8[3]0...21⁄2to 11⁄2[12.7to 38.1],excl 60.005[0.13]6101⁄8[3]0less than 0.065in.[1.6mm]nominal311⁄2to 31⁄2[38.1to 88.9],excl 60.010[0.25]6103⁄16[5]less than 0.095in.[2.4mm]nominal431⁄2to 51⁄2[88.9to 139.7],excl 60.015[0.38]6103⁄16[5]0less than 0.150in.[3.8mm]nominal551⁄2to 8[139.7to 203.2],incl60.030[0.76]6103⁄16[5]0less than 0.150in.[3.8mm]nominalAWhen tubes as ordered require wall thicknesses 3⁄4in.[19mm]or over,or an inside diameter 60%or less of the outside diameter,a wider variation in wall thickness is required.On such sizes a variation in wall thickness of 12.5%over or under will be permitted.For tubes less than 1⁄2in.[12.7mm]in inside diameter which cannot be successfully drawn over a mandrel,the wall thickness may vary 615%from that specified.BThese tolerances apply to cut lengths up to and including 24ft [7.3m].For lengths greater than 24ft [7.3m],the above over tolerances shall be increased by1⁄8in.[3mm]for each 10ft [3m]or fraction thereof over 24ft,or 1⁄2in.[13mm],whichever is lesser.COvality provisions of 12.2apply.A 268/A 268M –05a6巴巴客 免费下载标准SUMMARY OF CHANGESCommittee A01has identified the location of selected changes to this specification since the last issue, A268/A268M–05,which may impact the use of this specification.(Approved September1,2005)(1)Added S43932to Table1,Table3,and Table5.Committee A01has identified the location of selected changes to this specification since the last issue, A268/A268M–04a,which may impact the use of this specification.(Approved March1,2005)(1)Clarified when ASME request applies in SupplementaryRequirement S2.Committee A01has identified the location of selected changes to this specification since the last issue, A268/A268M–04,which may impact the use of this specification.(Approved September1,2004)(1)Deleted references to S32900throughout.(2)Deleted references to A789/A789M and A790/A790M throughout.(3)Deleted old Notes1,2,3,and4.(4)Added new Section15.(5)Revised the Supplementary Requirements.Committee A01has identified the location of selected changes to this specification since the last issue, A268/A268M–03,which may impact the use of this specification.(Approved May1,2004)(1)Revised grades TP409and TP410in Table3.Committee A01has identified the location of selected changes to this specification since the last issue, A268/A268M–01,which may impact the use of this specification.(Approved September10,2003)(1)Replaced Specification A450/A450M with Specification A1016/A1016M throughout.(2)Clarified ordering requirements to include purchaser’s responsibility in Section4.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this ers of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed everyfive years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,at the address shown below.This standard is copyrighted by ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the aboveaddress or at610-832-9585(phone),610-832-9555(fax),or service@(e-mail);or through the ASTM website().A268/A268M–05a7巴巴客 免费下载标准。