1、Designation: A268/A268M 10 (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
2、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 De
3、fense.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 the
4、segrades, 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 for
5、hot-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 separ
6、ately 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 uni
7、ts 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
8、 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 Pip
9、e 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
10、 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.
11、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
12、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 r
13、esponsibility 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 G
14、rade (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
15、 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 A
16、STM 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 AST
17、M International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE1ChemicalRequirementsGradeTP405TP410TP429TP430TP443TP4461TP4462A.TP409UNSDesignationS40500S41000S42900S43000S44300S44600S44600S40800S40900ElementComposition,%C,max0.080.150.120.120.200.200.120.0
18、80.08Mn,max1.001.001.001.001.001.501.501.001.00P,max0.0400.0400.0400.0400.0400.0400.0400.0450.045S,max0.0300.0300.0300.0300.0300.0300.0300.0450.030Si,max1.001.001.001.001.001.001.001.001.00Ni0.50max.0.75max0.75max0.50max0.80max0.50maxCr11.514.511.513.514.016.016.018.018.023.023.027.023.027.011.513.0
19、10.511.7Mo.Al0.100.30.Cu.0.901.25.N.0.250.25.Ti.12Cmin;6Cmin;1.10max0.75maxA268/A268M 10 (2016)2TABLE1ContinuedGradeTP439.TP430TiTPXM-27TPXM-33A18Cr-2Mo29-429-4-226-3-325-4-4.TP468UNSDesigna-tionS43035S43932S41500BS43036S44627S44626S44400S44700S44800S44660S44635S44735S32803S40977S43940S42035S46800El
20、ementComposition,%C,max0.070.0300.050.100.01A0.060.0250.0100.0100.0300.0250.0300.015C0.030.030.080.030Mn,max1.001.000.51.01.000.400.751.000.300.301.001.001.000.51.501.001.001.00P,max0.0400.0400.030.0400.020.0400.0400.0250.0250.0400.0400.0400.0200.0400.0400.0450.040S,max0.0300.0300.030.0300.020.0200.
21、0300.0200.0200.0300.0300.0300.0050.0150.0150.0300.030Si,max1.001.000.601.000.400.751.000.200.201.000.751.000.501.001.001.001.00Ni0.50max0.503.55.50.75max0.5Dmax0.50max1.00max0.15max2.02.51.03.503.54.51.00max3.04.00.301.00.1.02.50.50Cr17.0017.019.011.514.016.0025.027.525.027.017.519.528.030.028.030.0
22、25.028.024.526.028.0028.029.010.5012.5017.5018.5013.515.518.0020.0019.0019.5030.00Mo.0.51.0.0.751.500.751.501.752.503.54.23.54.23.04.03.54.53.604.201.82.5.0.21.2.Al,max0.150.15.Cu,max.0.20.20.0.150.15.N,max0.040.030(Ti+Cb)0.20+4(C+N)min.;0.75max.0.0150.0400.0350.020E0.020E0.0400.0350.0450.0200.030.0
23、.030Ti0.20+4(C.5Cmin;.7(C+N)(Ti+Cb).(Ti+Cb)=(Ti+Cb)=(Ti+Cb)=.0.100.600.300.500.070.30+N)min;0.75maxbutnoless0.20+40.201.000.20+40.201.001.10maxthan0.20(C+N)and6(C+N)and6min;1.00min;0.80(C+N)minto(C+N)maxmaxmin0.80maxminCb.0.050.20.0.15 0.50F.(3%C+0.30)min.0.100.60(Ti+Cb)=0.20+4(C+N) min;0.80maxAFors
24、malldiameterorthinwalls,orboth,tubing,wheremanydrawingpassesarerequired,acarbonmaximumof0.015%isnecessary.Smalloutsidediametertubesaredefinedasthoselessthan0.500in.12.7mminoutsidediameterandlightwalltubesasthoselessthan0.049in.1.2mminaveragewallthickness(0.040in.1mminminimumwallthickness).BPlatevers
25、ionofCA6NM.CCarbonplusnitrogen=0.30max.DNickelpluscopper.ECarbonplusnitrogen=0.025%max.FCb(C+N)=12min.A268/A268M 10 (2016)34.1.5 Length (specific or random),4.1.6 Optional requirements (hydrostatic or nondestructiveelectric test, Section 16),4.1.7 Test report required (Certification Section of Speci
26、fi-cation A1016/A1016M),4.1.8 Specification designation,4.1.9 Intergranular corrosion test, and4.1.10 Special requirements.5. General Requirements5.1 Material furnished under this specification shall con-form to the applicable requirements of Specification A1016/A1016M unless otherwise provided here
27、in.6. Manufacture6.1 The tubes shall be made by the seamless or weldedprocess with no filler metal added.7. Heat Treatment7.1 As a final heat treatment, tubes shall be reheated to atemperature of 1200 F 650 C or higher and cooled (asappropriate for the grade) to meet the requirements of thisspecific
28、ation.7.2 The martensitic grade UNS S 41500 shall be reheated toa temperature of 950 F 510 C or higher and cooled asappropriate to meet the requirements of this specification.8. Chemical Composition8.1 The steel shall conform to the chemical requirementsprescribed in Table 1.9. Product Analysis9.1 A
29、n analysis of either one billet or one length of flatrolledstock or one tube shall be made from each heat. The chemicalcomposition thus determined shall conform to the requirementsspecified.9.2 The product analysis tolerance of the Chemical Require-ments Table of A480/A480M shall apply. The product
30、analysistolerance is not applicable to the carbon content for materialwith a specified maximum carbon of 0.04 % or less.9.3 If the original test for product analysis fails, retests oftwo additional billets, lengths of flat-rolled stock or tubes shallbe made. Both retests for the elements in question
31、 shall meetthe requirements of the specification; otherwise all remainingmaterial in the heat or lot shall be rejected or, at the option ofthe producer, each billet or tube may be individually tested foracceptance. Billets, lengths of flat-rolled stock or tubes whichdo not meet the requirements of t
32、he specification shall berejected.10. Tensile Requirements10.1 The material shall conform to the tensile propertiesprescribed in Tables 3 and 4.11. Hardness Requirements11.1 The tubes shall have a hardness number not to exceedthose prescribed in Table 5.12. Permissible Variations in Dimensions12.1 V
33、ariations in outside diameter, wall thickness, andlength from those specified shall not exceed the amountsprescribed in Table 6.TABLE 2 Number of Tubes in a Lot Heat Treated by theContinuous ProcessSize of TubeSize of Lot2 in. 50.8 mm and over in outside diameter and0.200 in. 5.1 mm and over in wall
34、 thicknessnot more than 50 tubesLess than 2 in. 50.8 mm but over 1 in. 25.4 mmin outside diameter or over 1 in. 25.4 mm inoutside diameter and under 0.200 in. 5.1 mm inwall thicknessnot more than 75 tubes1 in. 25.4 mm or less in outside diameter not more than 125 tubesTABLE 3 Tensile RequirementsGra
35、de and UNS DesignationTensilestrength,min,ksi MPaYieldstrength,min,ksi MPaElongationA,Bin 2 in. or50 mm,min, %TP405S4050060 415 30 205 20.S4080055 380 30 205 20TP410S4100060 415 30 205 20TP429, TP430, and TP430 TiS429000, S 43000, and S 4303660 415 35 240 20TP443S4430070 485 40 275 20TP446-1S4460070
36、 485 40 275 18TP446-2S4460065 450 40 275 20TP409S4090055 380 25 170 20TP439S4303560 415 30 205 20S43932 60 415 30 205 20.S41500115 795 90 620 15TPXM-27S4462765 450 40 275 20TPXM-33S4462668 470 45 310 2018Cr-2MoS4440060 415 40 275 2029-4 and 29-4-2S44700 and S4480080 550 60 415 2026-3-3S4466085 585 6
37、5 450 2025-4-4S4463590 620 75 515 20.S4473575 515 60 415 1828-2-3.5S32803 87 600 72 500 16S40977 65 450 41 280 18S43940 62 430 36 250 18S42035 80 550 55 380 16TP468S4680060 415 30 205 22AFor tubing smaller than12 in. 12.7 mm in outside diameter, the elongationvalues given for strip specimens in Tabl
38、e 2 shall apply. Mechanical propertyrequirements do not apply to tubing smaller than18 in. 3.2 mm in outsidediameter or with walls thinner than 0.015 in. 0.4 mm.BFor longitudinal strip tests a deduction of 0.90 % for TP4461 and S44735 and1.00 % for all other grades shall be made from the basic minim
39、um elongation foreach132 in. 0.8 mm decrease in wall thickness below516 in. 8 mm. Thefollowing table gives the computed minimum values:A268/A268M 10 (2016)412.2 The permissible variations in outside diameter given inTable 6 are not sufficient to provide for ovality in thin-walledtubes, as defined in
40、 the Table. In such tubes, the maximum andminimum diameters at any cross section shall deviate from thenominal diameter by no more than twice the permissiblevariation in outside diameter given in Table 6; however, themean diameter at that cross section must still be within thegiven permissible varia
41、tion.12.3 When the specified wall is 2 % or less of the specifiedoutside diameter, the method of measurement is in accordancewith the agreement between the purchaser and the manufac-turer (see Note 1).NOTE 1Very thin wall tubing may not be stiff enough for the outsidediameter to be accurately measur
42、ed with a point contact test method, suchas with the use of a micrometer or caliper. When very thin walls arespecified, “go”“no go” ring gages are commonly used to measurediameters of 112 in. 38.1 mm or less. A 0.002-in. 0.05-mm additionaltolerance is usually added on the “go” ring gage to allow cle
43、arance forsliding. On larger diameters, measurement is commonly performed with api tape. Other test methods such as optical test methods may also beconsidered.13. Surface Condition13.1 All tubes shall be free of excessive mill scale, suitablefor inspection. A slight amount of oxidation will not beco
44、nsidered as scale. Any special finish requirements shall besubject to agreement between the manufacturer and the pur-chaser.14. Mechanical Tests Required14.1 Tension TestsOne tension test shall be made on aspecimen for lots of not more than 50 tubes. Tension tests shallbe made on specimens from two
45、tubes for lots of more than 50tubes.14.2 Flaring Test (for Seamless Tubes)One test shall bemade on specimens from one end of one tube from each lot offinished tubes. The minimum expansion of the inside diametershall be 10 %. For tubes over 8 in. 203.2 mm in outsidediameter, or tubes with wall thickn
46、ess38 in. 9.52 mm andover, the flattening test may be performed instead of the flaringtest unless the flaring test is specified in the purchase order.14.3 Flange Test (for Welded Tubes)One test shall bemade on specimens from one end of one tube from each lot offinished tubes. For tubes over 8 in. 20
47、3.2 mm in outsidediameter, or tubes with wall thickness38 in. 9.52 mm andover, the flattening test may be performed instead of the flangetest unless the flange test is specified in the purchase order.14.4 Hardness TestBrinell or Rockwell hardness testsshall be made on specimens from two tubes from e
48、ach lot.14.5 When more than one heat is involved, the tension,flaring, flanging, and hardness test requirements shall apply toeach heat.14.6 Reverse Flattening TestFor welded tubes, one re-verse flattening test shall be made on a specimen from each1500 ft 450 m of finished tubing.15. Intergranular Corrosion Test15.1 If intergranular corrosion testing is specified in thepurchase order, the test shall be made in accordance withPractices A763, using samples prepa
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