1、Designation:A803/A803M10 Designation: A803/A803M 11Standard Specification forWelded Ferritic Stainless Steel Feedwater Heater Tubes1This standard is issued under the fixed designation A803/A803M; the number immediately following the designation indicates the yearof original adoption or, in the case
2、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.1. Scope*1.1 This specification covers welded ferritic stainless steel feedwater heater tubes including t
3、hose bent, if specified, into the formof U-tubes for application in tubular feedwater heaters.1.2 The tubing sizes covered shall be58 to 1 in. 15.9 to 25.4 mm inclusive, in outside diameter, and average or minimum wallthicknesses of 0.028 in. 0.7 mm and heavier.1.3 The values stated in either SI uni
4、ts or inch-pound units are to be regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non
5、conformance with the specification. Theinch-pound units shall apply unless the “M” designation of this specification is specified in the order.2. Referenced Documents2.1 ASTM Standards:2A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet,
6、 and StripA763 Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless SteelsA941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and FerroalloysA1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stai
7、nless SteelTubes3. Terminology3.1 DefinitionsFor definitions of terms used in this specification, refer to Terminology A941.4. Ordering Information4.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material under this specification.Such requirements may
8、include, but are not limited to, the following:4.1.1 Quantity (length or number of pieces),4.1.2 Material description,4.1.3 Dimensions (outside diameter, wall thickness (minimum or average wall), and length),4.1.4 Grade (chemical composition) (Table 1), and4.1.5 U-bend requirements, if order specifi
9、es bending, U-bend schedules or drawings shall accompany the order.4.2 Optional RequirementsPurchaser shall specify whether annealing of the U-bends is required or whether tubes are to behydrotested or air-tested (see 10.5).4.3 Supplementary RequirementsPurchaser shall specify on this purchase order
10、 if material is to be eddy-current tested inaccordance with Supplementary Requirement S1 or S2, and if special test reports are required, under Supplementary RequirementS3, and,4.4 Any special requirements.5. General Requirements5.1 Material furnished to this specification shall conform to the appli
11、cable requirements of the latest published edition ofSpecification A1016/A1016M unless otherwise provided herein.1This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.10on Stainless and Alloy
12、Steel Tubular Products .Current edition approved MayApril 1, 2010.2011. Published June 2010.April 2011. Originally approved in 1982. Last previous edition approved in 20082010 asA803/A803M108. DOI: 10.1520/A0803_A0803M-101.2For referencedASTM standards, visit theASTM website, www.astm.org, or contac
13、tASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been
14、 made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.
15、*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.6. Materials and Manufacture6.1 The tube shall be made from flat-rolled steel by an automatic welding process with no ad
16、dition of filler metal.6.2 Surface contaminants may have detrimental effects on high temperature properties or corrosion resistance of tubing.Contamination by copper, lead, mercury, zinc, chlorides, or sulfur may be detrimental to stainless steels. The manufacturer shallemploy techniques which minim
17、ize surface contamination by these elements.7. Cleaning Before Annealing7.1 All lubricants or coatings used in the manufacture of straight-length tube or in the bending shall be removed from allsurfaces prior to any annealing treatments. U-bends on which a lubricant had been applied to the inside su
18、rface during bendingshall have the cleanness of their inside surface confirmed by blowing close-fitting acetone-soaked felt plugs through 10 % of thetubes of each bend radius. Dry, oil-free air or inert gas shall be used to blow the plugs through the tubes. If the plugs blown throughany tube show mo
19、re than a light gray discoloration, all tubes that have had a lubricant applied to the inside surface during bendingshall be recleaned. After recleaning 10 % of the tubes of each bend radius whose inside surface had been subjected to bending,lubricants shall be retested.8. Heat Treatment8.1 All fini
20、shed straight tubing or straight tubing ready for U-bending shall be furnished in the solution-annealed condition. Theannealing procedure shall consist of heating the material to a temperature of 1200F 650C or higher and cooling (as appropriatefor the grade) to meet the requirements of this specific
21、ation.8.2 If heat treatment of U-bends is specified, it shall satisfy the annealing procedure described in 8.1 and shall be done asfollows:8.2.1 The heat treatment shall be applied to the U-bend area plus approximately 6 in. 150 mm of each leg beyond the tangentpoint of the U-bend.8.2.2 If the heat
22、treatment specified in 8.2 is accomplished by resistance-heating methods wherein electrodes are clamped to thetubes, the clamped areas shall be visually examined for arc burns. Burn indications shall be cause for rejection unless they can beremoved by local polishing without encroaching upon minimum
23、 wall thickness.8.2.3 Temperature control shall be accomplished through the use of optical or emission pyrometers, or both. No temperature-indicating crayons, lacquers, or pellets shall be used.8.2.4 The inside of the tube shall be purged with a protective or an inert gas atmosphere during heating a
24、nd cooling to below700F 370C to prevent scaling of the inside surface. The atmosphere should be noncarburizing.9. Chemical Composition9.1 Product Analysis:TABLE 1 Chemical RequirementsGrade UNSS 40900TP409UNS S 43035TP439UNSS 44627TP XM-27UNS S 44626TP XM-33UNS S 4463525-4-4UNS S 4466026-3-3UNSS 447
25、0029-4UNSS 4480029-4-2UNS S 4440018-2UNS S 4473529-4CElement Composition, %C, max 0.08 0.07 0.01A0.06 0.025 0.030 0.010 0.010 0.025 0.030Mn, max 1.00 1.00 0.40 0.75 1.00 1.00 0.30 0.30 1.00 1.00P, max 0.045 0.040 0.02 0.040 0.040 0.040 0.025 0.025 0.040 0.040S, max 0.030 0.030 0.02 0.020 0.030 0.030
26、 0.020 0.020 0.030 0.030Si, max 1.00 1.00 0.40 0.75 0.75 1.00 0.20 0.20 1.00 1.00Ni 0.50 max 0.50 max 0.5Bmax 0.50 max 3.54.5 1.03.5 0.15 max 2.02.5 1.00 max 1.00 maxCr 10.5 17.019.0 25.027.5 25.027.0 24.526.0 25.028.0 28.030.0 28.030.0 17.519.5 28.030.011.7Mo . . . . . . 0.751.50 0.751.50 3.54.5 3.
27、04.0 3.54.2 3.54.2 1.752.50 3.64.2Al . 0.15max . . . . . . . .Cu . . . . . . 0.20 max 0.20 max . . . . . . 0.15 max 0.15 max . . . . . .N . . . 0.04 max 0.015max0.040 max 0.035 0.040 max 0.020 0.020 0.035 max 0.045 maxmaxCmaxCTi 6 3 Cmin; 0.75max0.20+4(C+N) min; 1.10max. 73 (C+N)butno less than0.20
28、min;(Ti + Cb) = 0.2+4(C+N)min; 0.80Ti+Cb=63(C + N) but noless than 0.20min;(Ti + Cb) =0.20+4(C+N) min; 0.80Ti+Cb=63(C + N) but noless than 0.20min; 1.00 max1.00 max max 1.00 max maxCb . . . . . . 0.050.20 . . . . . . . . . . . . . . . . . . . . .AFor small diameter or thin walls, or both, tubing, wh
29、ere many drawing passes are required, a carbon maximum of 0.015 % is necessary. Small outside diameter tubesare defined as those less than 0.500 in. 12.7 mm in outside diameter and light wall tubes as those less than 0.049 in. 1.2 mm in average wall thickness (0.040 in. 1mm in minimum wall thickness
30、).BNickel + copper.CCarbon + nitrogen = 0.025 max.A803/A803M 1129.1.1 The steel shall conform to the chemical composition in Table 1.9.1.2 When specified on the purchase order, a product analysis shall be supplied from one tube or coil of steel per heat. Theproduct analysis tolerance of Specificatio
31、n A480/A480M shall apply.9.1.3 If the original test for product analysis fails, retests of two additional lengths of flat-rolled stock or tubes shall be made.Both retests, for the elements in question, shall meet the requirements of this specification; otherwise all remaining material in theheat or
32、lot shall be rejected or, at the option of the producer, each length of flat-rolled stock or tube may be individually tested foracceptance. Lengths of flat-rolled stock or tubes that do not meet the requirements of this specification shall be rejected.10. Mechanical Requirements10.1 Tensile Properti
33、es:10.1.1 The material shall conform to the tensile properties shown in Table 2.10.1.2 One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimensfrom two tubes for lots of more than 50 tubes.10.1.3 Table 3 gives the computed minimum elon
34、gation values for each132 in. 0.8 mm decrease in wall thickness.10.2 Hardness:10.2.1 The tubes shall have a hardness number not to exceed those prescribed in Table 4. This hardness requirement is not toapply to the bend area of U-bend tubes which are not heat treated after bending.10.2.2 Brinell or
35、Rockwell hardness tests shall be made on specimens from two tubes from each lot.10.3 Reverse Flattening TestOne reverse flattening test shall be made on a specimen from each 1500 ft 460 m of finishedtubing.10.4 Flange TestFlange tests shall be made on specimens from each end of one finished tube, no
36、t the one used for theflattening test, from each lot.10.5 Pressure TestEach straight tube, or each U-tube after completion of the bending and post-bending heat treatment, shallbe pressure-tested in accordance with one of the following paragraphs as specified by the purchaser:10.5.1 Hydrostatic TestE
37、ach tube shall be given an internal hydrostatic test in accordance with SpecificationA1016/A1016M.10.5.2 Pneumatic TestEach tube shall be examined by a pneumatic test (either air underwater or pneumatic leak test) inaccordance with Specification A1016/A1016M.10.6 Lot Definitions:10.6.1 For flange re
38、quirements, the term “lot” applies to 125 tube groupings, prior to cutting to length, of the same nominal sizeand wall thickness, produced from the same heat of steel and annealed in a continuous furnace.10.6.2 For tension and hardness requirements, the term “lot” applies to all tubes, prior to cutt
39、ing to length, of the same nominaldiameter and wall thickness, produced from the same heat of steel and annealed in a continuous furnace at the same temperature,time at temperature, and furnace speed.11. Corrosion Resisting Properties11.1 One full section sample 1 in. 25 mm long from the center of a
40、 sample tube of the smallest radius bend that is heat treatedshall be tested in the heat treated condition in accordance with the appropriate practice in Practices A763 for the specified grade,or as agreed upon for TP409.11.2 One full-section sample 1 in. 25 mm long from each lot of straight tubes s
41、hall be tested in the finished condition inaccordance with the appropriate practice in Practices A763 for the specified grade, or as agreed upon for TP409.11.3 The appearance of any fissures or cracks in the test specimen, when evaluated in accordance with the Evaluation Sectionsof Practices A763 in
42、dicating the presence of intergranular attack, shall be cause for rejection of that lot.TABLE 2 Tensile RequirementsGradeTensile Strength,min, ksi MPaYield Strength,min, ksi MPaElongationAin2in.or 50 mm,min, %TP 409 55 380 30 205 20TP 439 60 415 30 205 20TP XM-27 65 450 40 275 20TP XM-33 68 470 45 3
43、10 2025-4-4 90 620 75 515 2026-3-3 85 585 65 450 2029-4 80 550 60 415 2029-4-2 80 550 60 415 2018-2 60 415 35 240 2029-4C 75 515 60 415 18AFor longitudinal strip tests, a deduction of 0.90 % for 29-4C and 1 % for allother grades shall be made from the basic minimum elongation for each132 in. 0.8mm d
44、ecrease in wall thickness below516 in. 8 mm. Table 3 gives the computedminimum values.A803/A803M 11311.4 For corrosion test requirements, the term “lot” applies to all tubes, prior to cutting to length, of the same nominal diameterand wall thickness, produced from the same heat of steel and annealed
45、 in a continuous furnace at the same temperature, time attemperature, and furnace speed.12. Permissible Variations in Dimensions ( Fig. 1)12.1 Permissible variations from the specified outside diameter shall be in accordance with Specification A1016/A1016M.Those tolerances do not apply to the bent p
46、ortion of the U-tubes. At the bent portion of a U-tube for R =23 D or greater, neitherthe major nor minor diameter of the tube shall deviate from the nominal diameter prior to bending by more than 10 %. If less than2 3 D is specified, tolerances could be greater.12.2 Permissible Variations from the
47、Specified Wall Thickness:12.2.1 Permissible variations from the specified minimum wall thickness shall not exceed +20 0 %.12.2.2 Permissible variations from the specified average wall thickness are 610 % of the nominal wall thickness.12.2.3 The wall thickness of the tube in the U-bent section shall
48、not be less than value determined by the equation:tf54RT4R 1 DTABLE 3 Minimum Elongation ValuesAWall ThicknessBElongation in 2 in. or 50 mm,min, %in. mm 29-4C All Other516 (0.312) 8 18 20932 (0.281) 7.2 17 1914 (0.250) 6.4 16 18732 (0.219) 5.6 15 17316 (0.188) 4.8 14 16532 (0.156) 4 13 1518 (0.125)
49、3.2 13 14332 (0.094) 2.4 12 13116 (0.062) 1.6 11 120.062 to 0.035, excl 1.6 to 0.9 10 120.035 to 0.022, excl 0.9 to 0.6 10 110.022 to 0.015, excl 0.6 to 0.4 10 11ACalculation elongation shall be rounded to the nearest whole number.BWhere the wall thickness lies between two values shown above, the minimumelongation value shall be determined by the following equation:Grade Equation29-4C E = 28.8t + 9.00E = 1.13t + 9.00All other E = 32t + 10.00E = 1.25t + 10.00
