1、Designation: A803/A803M 10Standard 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 of revision, the year of
2、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 steelfeedwater heater tubes including those bent, if specified, i
3、ntothe form of U-tubes for application in tubular feedwaterheaters.1.2 The tubing sizes covered shall be58 to 1 in. 15.9 to 25.4mm inclusive, in outside diameter, and average or minimumwall thicknesses of 0.028 in. 0.7 mm and heavier.1.3 The values stated in either SI units or inch-pound unitsare to
4、 be regarded separately 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 nonconformance with thespecificati
5、on. The inch-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 forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet, and StripA763 Practices for Detec
6、ting Susceptibility to IntergranularAttack in Ferritic Stainless SteelsA941 Terminology Relating to Steel, Stainless Steel, Re-lated Alloys, and FerroalloysA1016/A1016M Specification for General Requirementsfor Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-less Steel Tubes3. Terminology3.1
7、 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminology A941.4. Ordering Information4.1 It is the responsibility of the purchaser to specify allrequirements that are necessary for material under this speci-fication. Such requirements may include, but are not limited to
8、,the following:4.1.1 Quantity (length or number of pieces),4.1.2 Material description,4.1.3 Dimensions (outside diameter, wall thickness (mini-mum or average wall), and length),4.1.4 Grade (chemical composition) (Table 1), and4.1.5 U-bend requirements, if order specifies bending,U-bend schedules or
9、drawings shall accompany the order.4.2 Optional RequirementsPurchaser shall specifywhether annealing of the U-bends is required or whether tubesare to be hydrotested or air-tested (see 10.5).4.3 Supplementary RequirementsPurchaser shall specifyon this purchase order if material is to be eddy-current
10、 tested inaccordance with Supplementary Requirement S1 or S2, and ifspecial test reports are required, under Supplementary Require-ment S3, and,4.4 Any special requirements.5. General Requirements5.1 Material furnished to this specification shall conform tothe applicable requirements of the latest p
11、ublished edition ofSpecification A1016/A1016M unless otherwise providedherein.6. Materials and Manufacture6.1 The tube shall be made from flat-rolled steel by anautomatic welding process with no addition of filler metal.6.2 Surface contaminants may have detrimental effects onhigh temperature propert
12、ies or corrosion resistance of tubing.Contamination by copper, lead, mercury, zinc, chlorides, orsulfur may be detrimental to stainless steels. The manufacturershall employ techniques which minimize surface contamina-tion by these elements.7. Cleaning Before Annealing7.1 All lubricants or coatings u
13、sed in the manufacture ofstraight-length tube or in the bending shall be removed from allsurfaces prior to any annealing treatments. U-bends on whicha lubricant had been applied to the inside surface during1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel a
14、nd Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel Tubular Products.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1982. Last previous edition approved in 2008 as A803/A803M08.DOI: 10.1520/A0803_A0803M-10.2For refer
15、enced 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.1*A Summary of Changes section appears at the end of this standard.Copy
16、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.bending shall have the cleanness of their inside surfaceconfirmed by blowing close-fitting acetone-soaked felt plugsthrough 10 % of the tubes of each bend radius. Dry, oil-free airor inert g
17、as shall be used to blow the plugs through the tubes.If the plugs blown through any tube show more than a lightgray discoloration, all tubes that have had a lubricant applied tothe inside surface during bending shall be recleaned. Afterrecleaning 10 % of the tubes of each bend radius whose insidesur
18、face had been subjected to bending, lubricants shall beretested.8. Heat Treatment8.1 All finished straight tubing or straight tubing ready forU-bending shall be furnished in the solution-annealed condi-tion. The annealing procedure shall consist of heating thematerial to a temperature of 1200F 650C
19、or higher andcooling (as appropriate for the grade) to meet the requirementsof this specification.8.2 If heat treatment of U-bends is specified, it shall satisfythe annealing procedure described in 8.1 and shall be done asfollows:8.2.1 The heat treatment shall be applied to the U-bend areaplus appro
20、ximately 6 in. 150 mm of each leg beyond thetangent point of the U-bend.8.2.2 If the heat treatment specified in 8.2 is accomplishedby resistance-heating methods wherein electrodes are clampedto the tubes, the clamped areas shall be visually examined forarc burns. Burn indications shall be cause for
21、 rejection unlessthey can be removed by local polishing without encroachingupon minimum wall thickness.8.2.3 Temperature control shall be accomplished throughthe use of optical or emission pyrometers, or both. Notemperature-indicating crayons, lacquers, or pellets shall beused.8.2.4 The inside of th
22、e tube shall be purged with a protectiveor an inert gas atmosphere during heating and cooling to below700F 370C to prevent scaling of the inside surface. Theatmosphere should be noncarburizing.9. Chemical Composition9.1 Product Analysis:9.1.1 The steel shall conform to the chemical compositionin Tab
23、le 1.9.1.2 When specified on the purchase order, a productanalysis shall be supplied from one tube or coil of steel perheat. The product analysis tolerance of Specification A480/A480M shall apply.9.1.3 If the original test for product analysis fails, retests oftwo additional lengths of flat-rolled s
24、tock or tubes shall bemade. Both retests, for the elements in question, shall meet therequirements of this specification; otherwise all remainingmaterial in the heat or lot shall be rejected or, at the option ofthe producer, each length of flat-rolled stock or tube may beindividually tested for acce
25、ptance. Lengths of flat-rolled stockor tubes that do not meet the requirements of this specificationshall be rejected.10. Mechanical Requirements10.1 Tensile Properties:10.1.1 The material shall conform to the tensile propertiesshown in Table 2.10.1.2 One tension test shall be made on a specimen for
26、 lotsof not more than 50 tubes. Tension tests shall be made onspecimens from two tubes for lots of more than 50 tubes.10.1.3 Table 3 gives the computed minimum elongationvalues for each132 in. 0.8 mm decrease in wall thickness.10.2 Hardness:TABLE 1 Chemical RequirementsGrade UNSS 40900TP409UNS S 430
27、35TP439UNSS 44627TP XM-27UNS S 44626TP XM-33UNS S 4463525-4-4UNS S 4466026-3-3UNSS 4470029-4UNSS 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
28、.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 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 25.0
29、28.0 28.030.0 28.030.0 17.519.5 28.030.011.7Mo . . . . . . 0.751.50 0.751.50 3.54.5 3.04.0 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
30、 maxmaxCmaxCTi 6 3 Cmin; 0.75max0.20+4(C+N) min; 1.10max. 73 (C+N)butno less than0.20 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 . . . . .
31、 . . . . . . . . . . . . . . . .AFor small diameter or thin walls, or both, tubing, where 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 th
32、an 0.049 in. 1.2 mm in average wall thickness (0.040 in. 1mm in minimum wall thickness).BNickel + copper.CCarbon + nitrogen = 0.025 max.A803/A803M 10210.2.1 The tubes shall have a hardness number not to exceedthose prescribed in Table 4. This hardness requirement is not toapply to the bend area of U
33、-bend tubes which are not heattreated after bending.10.2.2 Brinell or Rockwell hardness tests shall be made onspecimens from two tubes from each lot.10.3 Reverse Flattening TestOne reverse flattening testshall be made on a specimen from each 1500 ft 460 m offinished tubing.10.4 Flange TestFlange tes
34、ts shall be made on specimensfrom each end of one finished tube, not the one used for theflattening test, from each lot.10.5 Pressure TestEach straight tube, or each U-tube aftercompletion of the bending and post-bending heat treatment,shall be pressure-tested in accordance with one of the follow-in
35、g paragraphs as specified by the purchaser:10.5.1 Hydrostatic TestEach tube shall be given an inter-nal hydrostatic test in accordance with Specification A1016/A1016M.10.5.2 Pneumatic TestEach tube shall be examined by apneumatic test (either air underwater or pneumatic leak test) inaccordance with
36、Specification A1016/A1016M.10.6 Lot Definitions:10.6.1 For flange requirements, the term “lot” applies to 125tube groupings, prior to cutting to length, of the same nominalsize and wall thickness, produced from the same heat of steeland annealed in a continuous furnace.10.6.2 For tension and hardnes
37、s requirements, the term “lot”applies to all tubes, prior to cutting to length, of the samenominal diameter and wall thickness, produced from the sameheat of steel and annealed in a continuous furnace at the sametemperature, time at temperature, and furnace speed.11. Corrosion Resisting Properties11
38、.1 One full section sample 1 in. 25 mm long from thecenter of a sample tube of the smallest radius bend that is heattreated shall be tested in the heat treated condition in accor-dance with the appropriate practice in Practices A763 for thespecified grade, or as agreed upon for TP409.11.2 One full-s
39、ection sample 1 in. 25 mm long from eachlot of straight tubes shall be tested in the finished condition inaccordance with the appropriate practice in Practices A763 forthe specified grade, or as agreed upon for TP409.11.3 The appearance of any fissures or cracks in the testspecimen, when evaluated i
40、n accordance with the EvaluationSections of Practices A763 indicating the presence of inter-granular attack, shall be cause for rejection of that lot.11.4 For corrosion test requirements, the term “lot” appliesto all tubes, prior to cutting to length, of the same nominaldiameter and wall thickness,
41、produced from the same heat ofsteel and annealed in a continuous furnace at the sametemperature, time at temperature, and furnace speed.12. Permissible Variations in Dimensions ( Fig. 1)12.1 Permissible variations from the specified outside diam-eter shall be in accordance with SpecificationA1016/A1
42、016M.Those tolerances do not apply to the bent portion of theU-tubes. At the bent portion of a U-tube for R =23 D orgreater, neither the major nor minor diameter of the tube shallTABLE 2 Tensile RequirementsGradeTensile Strength,min, ksi MPaYield Strength,min, ksi MPaElongationAin2in.or 50 mm,min, %
43、TP 409 55 380 30 205 20TP 439 60 415 30 205 20TP XM-27 65 450 40 275 20TP XM-33 68 470 45 310 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 %
44、for allother grades shall be made from the basic minimum elongation for each132 in. 0.8mm decrease in wall thickness below516 in. 8 mm. Table 3 gives the computedminimum values.TABLE 3 Minimum Elongation ValuesAWall ThicknessBElongation in 2 in. or 50 mm,min, %in. mm 29-4C All Other516 (0.312) 8 18
45、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) 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
46、 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 + 10.00where:E = elongation in
47、 2 in. or 50mm, %, andt = actual thickness of specimen, in. mm.TABLE 4 Hardness RequirementsGradeBrinell Hardness,maxRockwell Hardness,B Scale,maxTP 409 207 95TP 439 207 95P XM-27 241 100TP XM-33 241 10025-4-4 270 27A26-3-3 265 25A29-4 241 10029-4-2 241 10018-2 217 9529-4C 241 100ARockwell Hardness,
48、 C scale.A803/A803M 103deviate from the nominal diameter prior to bending by morethan 10 %. If less than 2 3 D is specified, tolerances could begreater.12.2 Permissible Variations from the Specified Wall Thick-ness:12.2.1 Permissible variations from the specified minimumwall thickness shall not exce
49、ed +20 0 %.12.2.2 Permissible variations from the specified averagewall thickness are 610 % of the nominal wall thickness.12.2.3 The wall thickness of the tube in the U-bent sectionshall not be less than value determined by the equation:tf54RT4R 1 Dwhere:tf= wall thickness after bending, in. mm,T = specified minimum tube wall thickness, in. mm,R = centerline bend radius, in. mm, andD = nominal outside tube diameter, in. mm.12.3 Permissible Variation
