1、Designation: A 789/A 789M 08aStandard Specification forSeamless and Welded Ferritic/Austenitic Stainless SteelTubing for General Service1This standard is issued under the fixed designationA 789/A 789M; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification2covers grades of nominal wall thick-ness, stainless steel tubing f
3、or services requiring generalcorrosion resistance, with particular emphasis on resistance tostress corrosion cracking. These steels are susceptible toembrittlement if used for prolonged periods at elevated tem-peratures.1.2 The values stated in either inch-pound units or SI unitsare to be regarded s
4、eparately as standard. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independently of the other. Combining valuesfrom the two systems may result in nonconformance with thespecification. Within the text, the SI units are shown inbrackets. The inch-pound
5、 units shall apply unless the Mdesignation of this specification is specified in the order.2. Referenced Documents2.1 ASTM Standards:3A 480/A 480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet, and StripA 1016/A 1016M Specification for General R
6、equirementsfor Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-less Steel TubesE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)2.2 SAE Standard:4SAE J 1086 Practice for Numbering Metals and Alloys(UNS)3. Ordering Information3.1 Orders for product under this
7、 specification should in-clude the following, as required, to describe the desiredmaterial adequately:3.1.1 Quantity (feet, metres, or number of lengths),3.1.2 Name of product (seamless or welded tubes),3.1.3 Grade (see Table 1),3.1.4 Size (outside diameter and nominal wall thickness),3.1.5 Length (
8、specific or random),3.1.6 Optional requirements (for product analysis, see Sec-tion 8; for hydrostatic or nondestructive electric test, seeSection 10),3.1.7 Test report required (see the Inspection section ofSpecification A 1016/A 1016M),3.1.8 Specification designation, and3.1.9 Special requirements
9、.4. General Requirements4.1 Product furnished under this specification shall conformto the applicable requirements of Specification A 1016/A 1016M, unless otherwise provided herein.5. Manufacture5.1 The tubes shall be made by the seamless or weldedprocess with no filler metal added.6. Heat Treatment
10、6.1 All tubes shall be furnished in the heat-treated conditionin accordance with the procedures shown in Table 2. Forseamless tubes, as an alternate to final heat treatment in acontinuous furnace or batch-type furnace, immediately follow-ing hot forming while the temperature of the tubes is not less
11、than the specified minimum solution treatment temperature,tubes may be individually quenched in water or rapidly cooledby other means.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
12、 on Stainless and Alloy Steel Tubular Products.Current edition approved April 15, 2008. Published May 2008. Originallyapproved in 1981. Last previous edition approved in 2008 as A 789/A 789M08.2For ASME Boiler and Pressure Vessel Code applications, see related Specifi-cation SA789 in Section II of t
13、hat Code.3For 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 Summary page onthe ASTM website.4Available from Society of Automotive Engineers (SAE
14、), 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, United States.7. Chemical Composition7.1 The steel shall conform
15、 to the chemical requirementsprescribed in Table 1.8. Product Analysis8.1 An analysis of either one billet or one length offlat-rolled stock or one tube shall be made from each heat. Thechemical composition thus determined shall conform to therequirements specified.8.2 A product analysis tolerance (
16、see the annex table onChemical Requirements (Product Analysis Tolerances) inSpecification A 480/A 480M) shall apply. The product analysistolerance is not applicable to the carbon content for materialwith a specified maximum carbon of 0.04 % or less.8.3 If the original test for product analysis fails
17、, retests oftwo additional billets, lengths of flat-rolled stock, or tubes shallbe made. Both retests for the elements in question shall meetthe requirements of this specification; otherwise, all remainingmaterial in the heat shall be rejected or, at the option of theproducer, each billet or tube ma
18、y be individually tested foracceptance. Billets, lengths of flat-rolled stock, or tubes that donot meet the requirements of this specification shall be re-jected.NOTE 1For flange and flaring requirements, the term lot applies to alltubes prior to cutting of the same nominal size and wall thickness t
19、hat areproduced from the same heat of steel. When final heat treatment is in abatch-type furnace, a lot shall include only those tubes of the same sizeand from the same heat that are heat treated in the same furnace charge.When the final heat treatment is in a continuous furnace, or when heattreated
20、 condition is obtained directly by quenching after hot forming, thenumber of tubes of the same size and from the same heat in a lot shall bedetermined from the size of the tubes as prescribed in Table 3.NOTE 2For tension and hardness test requirements, the term lotapplies to all tubes prior to cutti
21、ng, of the same nominal diameter and wallthickness that are produced from the same heat of steel. When final heattreatment is in a batch-type furnace, a lot shall include only those tubes ofthe same size and the same heat that are heat treated in the same furnacecharge. When the final heat treatment
22、 is in a continuous furnace, or whenheat treated condition is obtained directly by quenching after hot forming,a lot shall include all tubes of the same size and heat, heat treated in thesame furnace at the same temperature, time at heat, and furnace speed, orall tubes of the same size and heat, hot
23、 formed and quenched in the sameproduction run.9. Mechanical Tests Required9.1 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 tubes for lots of more than 50tubes (see Note 2).9.2 Flaring Test (for Seamless
24、 Tubes)One test shall bemade on specimens from one end of one tube from each lot(see Note 1) of finished tubes. The minimum expansion of theinside diameter shall be 10 %.9.3 Flange Test (for Welded Tubes)One test shall be madeon specimens from one end of one tube from each lot (see Note1) of finishe
25、d tubes.9.4 Hardness TestBrinell or Rockwell hardness tests shallbe made on specimens from two tubes from each lot (see Note2).9.5 When more than one heat is involved, the tension,flaring, flanging, and hardness test requirements shall apply toeach heat.9.6 Reverse Flattening TestFor welded tubes, o
26、ne reverseflattening test shall be made on a specimen from each 1500 ft450 m of finished tubing.TABLE 1 Chemical RequirementsAUNSDesignationBC Mn P S Si Ni Cr Mo N Cu OthersS31200 0.030 2.00 0.045 0.030 1.00 5.56.5 24.026.0 1.202.00 0.140.20 . . . . . .S31260 0.030 1.00 0.030 0.030 0.75 5.57.5 24.02
27、6.0 2.53.5 0.100.30 0.200.80 W 0.100.50S31500 0.030 1.202.00 0.030 0.030 1.402.00 4.35.2 18.019.0 2.503.00 0.050.1 . . . . . .S31803 0.030 2.00 0.030 0.020 1.00 4.56.5 21.023.0 2.53.5 0.080.20 . . . . . .S32001 0.030 4.006.00 0.040 0.030 1.00 1.03.0 19.521.5 0.60 0.050.17 1.00 . . .S32003 0.030 2.00
28、 0.030 0.020 1.00 3.0-4.0 19.5-22.5 1.50-2.00 0.14-0.20 . . . . . .S32101 0.040 4.0-6.0 0.040 0.030 1.00 1.35-1.70 21.0-22.0 0.10-0.80 0.20-0.25 0.10-0.80 . . .S32202 0.030 2.00 0.040 0.010 1.00 1.002.80 21.524.0 0.45 0.180.26 . . . . . .S32205 0.030 2.00 0.030 0.020 1.00 4.56.5 22.023.0 3.03.5 0.14
29、0.20 . . . . . .S32304 0.030 2.50 0.040 0.040 1.00 3.05.5 21.524.5 0.050.60 0.050.20 0.050.60 . . .S32506 0.030 1.00 0.040 0.015 0.90 5.57.2 24.026.0 3.03.5 0.080.20 . . . W 0.050.30S32520 0.030 1.50 0.035 0.020 0.80 5.58.0 23.025.0 3.5. 0.200.35 0.503.00 . . .S32550 0.04 1.50 0.040 0.030 1.00 4.56.
30、5 24.027.0 2.93.9 0.100.25 1.502.50 . . .S32707 0.030 1.50 0.035 0.010 0.50 5.59.5 26.029.0 4.05.0 0.300.50 1.0 max Co 0.52.0S32750 0.030 1.20 0.035 0.020 0.80 6.08.0 24.026.0 3.05.0 0.240.32 0.50 . . .S32760 0.05 1.00 0.030 0.010 1.00 6.08.0 24.026.0 3.04.0 0.200.30 0.501.00 W 0.501.0040 minCS32808
31、 0.030 1.10 0.030 0.030 0.50 7.08.2 27.027.9 0.801.20 0.300.40 . . . W 2.102.50S32900 0.08 1.00 0.040 0.030 0.75 2.55.0 23.028.0 1.002.00 . . . . . . . . .S32906 0.030 0.801.50 0.030 0.030 0.80 5.87.5 28.0 30.0 1.502.60 0.300.40 0.80 . . .S32950 0.030 2.00 0.035 0.010 0.60 3.55.2 26.029.0 1.002.50 0
32、.150.35 . . . . . .S33207 0.030 1.50 0.035 0.010 0.80 6.09.0 29.033.0 3.05.0 0.400.60 1.0 . . .S39274 0.030 1.00 0.030 0.020 0.80 6.08.0 24.026.0 2.53.5 0.240.32 0.200.80 W 1.502.50S39277 0.025 0.80 0.025 0.002 0.80 6.58.0 24.026.0 3.004.00 0.230.33 1.202.00 W 0.801.21AMaximum, unless a range or min
33、imum is indicated. Where ellipses (.) appear in this table, there is no minimum and analysis for the element need not be determinedor reported.BDesignation established in accordance with Practice E 527 and SAE J1086.C%Cr+3.33 %Mo+163 %N.A 789/A 789M 08a210. Hydrostatic or Nondestructive Electric Tes
34、t10.1 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 manufacturer, unless otherwisespecified in the purchase order.10.2 The hydrostatic test shall be in accordance with Speci-fication A 1016/A 1016M, e
35、xcept that in the calculation of thehydrostatic test pressure 64000(441.2) shall be substituted for32000(220.6).11. Tensile and Hardness Properties11.1 The material shall conform to the tensile and hardnessproperties prescribed in Table 4.12. Permissible Variations in Dimensions12.1 Variations in ou
36、tside diameter, wall thickness, andlength from those specified shall not exceed the amountsprescribed in Table 5.12.2 The permissible variations in outside diameter given inTable 5 are not sufficient to provide for ovality in thin-walledtubes, as defined in the table. In such tubes, the maximum andm
37、inimum diameters at any cross section shall deviate from thenominal diameter by no more than twice the permissiblevariation in outside diameter given in Table 5; however, themean diameter at that cross section must still be within thegiven permissible variation.13. Surface Condition13.1 All tubes sh
38、all be free of excessive mill scale, suitablefor inspection. A slight amount of oxidation will not beTABLE 2 Heat TreatmentUNS Designation Temperature F C QuenchS31200 1920201010501100rapid cooling in waterS31260 1870201010201100rapid cooling in air or waterS31500 180019009801040rapid cooling in air
39、 or waterS31803 1870201010201100rapid cooling in air or waterS32001 180019509821066rapid cooling in air or waterS32003 1850205010101120rapid cooling in air or waterS32101 1870 1020 min quenched in water or rapidlycooled by other meansS32202 180019759801080rapid cooling in air or waterS32205 18702010
40、10201100rapid cooling in air or waterS32304 170019209251050rapid cooling in air or waterS32506 1870205010201120rapid cooling in air or waterS32520 1975205010801120rapid cooling in air or waterS32550 19001040 minrapid cooling in air or waterS32707 1975205010801120rapid cooling in air or waterS32750 1
41、880206010251125rapid cooling in air or waterS32760 2010208511001140rapid cooling in air or waterS32808 1920210010501150rapid cooling in air or waterS32900 17001750925955rapid cooling in air or waterS32906 1870210010201150rapid cooling in air or waterS32950 182018809901025air coolS33207 1905208510401
42、140rapid cooling in wateror by other meansS39274 1920206010251125rapid cooling in air or waterS39277 1975215510801180rapid cooling in air or waterTABLE 3 Number of Tubes in a Lot Heat Treated by theContinuous Process or by Direct Quench after Hot FormingSize of Tube Size of Lot2 in. 50.8 mm and over
43、 in outside diameterand 0.200 in. 5.1 mm and overin wall thicknessnot more than 50 tubesLess than 2 in. 50.8 mm but over 1 in. 25.4mm in outside diameter or over 1 in.25.4 mm in outside diameter and under0.200 in. 5.1 mm in wall thicknessnot more than 75 tubes1 in. 25.4 mm or less in outside diamete
44、r not more than 125 tubesTABLE 4 Tensile and Hardness RequirementsAUNS DesignationTensileStrength,min, ksiMPaYieldStrength,min, ksiMPaElongationin 2 in. or50 mm,min, %Hardness, maxHBW HRCS31200 100 690 65 450 25 280 . . .S31260 100 690 65 450 25 290 30S31500 92 630 64 440 30 290 30S31803 90 620 65 4
45、50 25 290 30S32001 90 620 65 450 25 290 30S32003B100 690 70 485 25 290 30S32101Wall # 0.187 in.5.00 mm101 700 77 530 30 290 . . .Wall 0.187 in.5.00 mm94 650 65 450 30 290 . . .S32202 94 650 64 650 30 290 30S32205 95 655 70 485 25 290 30S32304OD 1 in. 25 mm andUnder 100 690 65 450 25 . . . . . .OD ov
46、er 1 in. 25 mm 87 600 58 400 25 290 30S32506 90 620 65 450 18 302 32S32520 112 770 80 550 25 310 . . .S32550 110 760 80 550 15 297 31S32707 133 920 101 700 25 318 34S32750 116 800 80 550 15 300 32S32760 109 750 80 550 25 300 . . .S32808 116 800 80 550 15 310 32S32900 90 620 70 485 20 271 28S32906Wal
47、l below 0.40 in.10 mm116 800 94 650 25 300 32Wall 0.40 in. 10 mmand above109 750 80 550 25 300 32S32950 100 690 70 480 20 290 30S33207Wall below 0.157 in.4 mm138 950 112 770 15 336 36Wall 0.157 in.4 mm and above123 850 101 700 15 336 36S39274 116 800 80 550 15 310 32S39277 120 825 90 620 25 290 30AF
48、or tubing smaller than12 in. 12.7 mm in outside diameter, the elongationvalues given for strip specimens in Table 4 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.BPrior to A 789/A 789M04, the values for S32003 were 90 ksi tensile strengthand 65 ksi yield strength.A 789/A 789M 08a3considered as scale. Any special finish requirements shall besubject to agreement between the manufacturer and the pur-chaser.14. Product Markin
