1、Designation: A 1020/A 1020M 02Standard Specification forSteel Tubes, Carbon and Carbon Manganese, FusionWelded, for Boiler, Superheater, Heat Exchanger andCondenser Applications1This standard is issued under the fixed designation A 1020/A 1020M; the number immediately following the designation indic
2、ates theyear of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers minimum wall thi
3、cknesswelded tubes made from carbon and carbon manganese steelslisted in Table 1, with various grades intended for use in boiler,superheater, heat exchanger, or condenser applications.1.2 The tubing sizes and thicknesses usually furnished tothis specification are14 to 5 in. 6.3 to 127 mm in outsided
4、iameter and 0.015 to 0.375 in. 0.4 to 9.5 mm, inclusive, inwall thickness. Tubing having other dimensions may be fur-nished provided such tubes comply with all other requirementsof this specification.1.3 Mechanical property requirements do not apply totubing smaller than18 in. 3.2 mm in inside diame
5、ter or 0.015in. 0.4 mm in thickness.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe used independently o
6、f the other. Combining values from thetwo systems may result in nonconformance with the specifi-cation. The inch-pound units shall apply unless the “M”designation of the specification is specified in the order.1.5 Optional supplementary requirements are provided andwhen desired, shall be so stated o
7、n the purchase order.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior
8、to use.2. Referenced Documents2.1 ASTM Standards:A 450/A 450M Specification for General Requirements forCarbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes2E 213 Practice for Ultrasonic Examination of Metal Pipeand Tubing3E 273 Practice for Ultrasonic Examination of the WeldZone of Welded Pipe
9、and Tubing33. Ordering Information3.1 Orders for material under this specification shouldinclude the following, as required, to describe the desiredmaterial adequately:3.1.1 Quantity (feet, metres, or number of lengths).3.1.2 Name of material (welded tubes).3.1.3 Grade (Table 1).3.1.4 Size (outside
10、diameter and minimum wall thickness).3.1.5 Length (specific or random).3.1.6 Optional requirements (product analysis, hydrostaticor nondestructive electric test, crush test, and bar coding).3.1.7 Test report required (see Certification Section ofSpecification A 450/A 450M).3.1.8 Specification design
11、ation.3.1.9 Optional supplementary requirements are providedand when desired, shall be designated on the order.4. General Requirements4.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A 450/A 450M, unless otherwise pr
12、ovidedherein.5. Materials and Manufacture5.1 All steels shall be killed.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved Ma
13、r. 10, 2002. Published May 2002. Originallypublished as A 1020/A 1020M - 01. Last previous edition A 1020/A 1020M - 01.2Annual Book of ASTM Standards, Vol 01.01.3Annual Book of ASTM Standards, Vol 03.03.TABLE 1 Chemical Requirements, Composition, %Element Grade ALow CarbonSteelGrade CMedium CarbonSt
14、eelGrade DCarbon ManganeseSteelCarbon 0.060.18 0.30 max 0.27 maxManganese 0.270.63 0.80 max 1.001.50Phosphorus 0.035 max 0.035 max 0.030 maxSulfur 0.035 max 0.035 max 0.015 maxSilicon No Requirement No Requirement 0.10 min1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consho
15、hocken, PA 19428-2959, United States.5.2 The tubes shall be made by an automatic fusion weldingprocess with no addition of filler metal.6. Heat Treatment6.1 After welding, all tubes shall be heat treated at atemperature of 1650F 900C or higher and followed bycooling in air or in the cooling chamber
16、of a controlledatmosphere furnace. Cold drawn tubes shall be heat treatedafter the final cold-draw pass at a temperature of 1200F650C or higher.7. Chemical Composition7.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 1.7.2 When a grade is ordered under thi
17、s specification, sup-plying an alloy grade that specifically requires the addition ofany element other than those listed in Table 1 is not permitted.8. Product Analysis8.1 For the purpose of product analysis, a lot consists of 250pieces for sizes up to and including 3 in. 76.2 mm OD and100 pieces fo
18、r sizes over 3 in. 76.2 mm OD; or when tubesare identified by heat number, all tubes within that heat.8.2 When requested on the purchase order, a product analy-sis shall be made by the manufacturer or supplier from one tubeper lot. The chemical composition thus determined shallconform to the require
19、ments specified.8.3 If the original test for product analysis fails, retest of twoadditional tubes per lot shall be made. Both retests, for theelements in question, shall meet the requirements of thespecification; otherwise all remaining material in the heat or lotshall be rejected; or at the option
20、 of the producer, each tubemay be individually tested for acceptance and those pieces thatdo not meet the requirements of the specification shall berejected.9. Tensile and Hardness Requirements9.1 The term lot for tension and hardness tests applies to alltubes prior to cutting, of the same specified
21、 outside diameterand wall thickness, which are produced from the same heat ofsteel. When final heat treatment is in a batch-type furnace, a lotshall include only those tubes of the same size and the sameheat which are heat treated in the same furnace charge. Whenthe final heat treatment is in a cont
22、inuous furnace, a lot shallinclude all tubes of the same size and heat, heat treated in thesame furnace, at the same temperature, time at heat, andfurnace speed.9.2 For Grade A tubes, hardness test shall be made onspecimens from each of two tubes from each lot and shall nothave a hardness number exc
23、eeding 72 HRB.9.3 Grade C and D tubes, one tension test shall be made onspecimens from each of two tubes from each lot and shallconform to properties prescribed in Table 2.9.4 Table 3 gives the computed minimum elongation valuesfor each132-in, 0.8-mm decrease in wall thickness. Where thewall thickne
24、ss lies between two values shown above. Theminimum elongation value shall be determined by the follow-ing equation:E 5 48t 1 15.00E 5 1.87t 1 15.00#where:E = elongation in 2 in. or 50 mm, min, %, andt = actual wall thickness of specimen, in. mm.10. Crush Test10.1 Where specified in the purchase orde
25、r, crushing testsshall be made. The test specimens shall be sections of tubehaving a length that is at least 212 times the specified outsidediameter of the tube for tubes that are less than 1 in. 25.4 mmin specified outside diameter, and at least 212 in. 63 mm fortubes that are 1 in. 25.4 mm or larg
26、er in specified outsidediameter. Slight surface checks shall not be cause for rejection.The test specimens shall withstand crushing longitudinallywithout cracking, splitting, or opening at the weld, as follows:Wall Thickness of Tubes,in. mmHeight of Crushed Section,in. mmGrade A Tubes Grades C and D
27、 Tubes0.135 in. 3.4 and under34 in. 19 or until outsidefolds are in contactCrush tests not requiredOver 0.135 in. 3.4 114 3211. Mechanical Tests Required11.1 For mechanical tests, a lot consists of 250 tubes forsizes up to and including 3 in. 76.2 mm and 100 tubes forsizes over 3 in. 76.2 mm, or fra
28、ction thereof, prior to cutting.11.2 Flattening TestsOne flattening test shall be made onspecimens from each of two tubes from each lot or fractionthereof.11.3 Flange Test:TABLE 2 Tensile RequirementsGrade C Grade DTensile strength, min, ksi, MPa 60 415 70 485Yield strength, min, ksi, MPa 37 255 40
29、275Elongation in 2 in. or 50 mm, min % 30 30For elongation strip tests, a deduction for each132-in. 0.8mm decrease in wall thickness below516 in. 8 mm fromthe basic minimum elongation of the following percentagepoints shall be made.1.50A1.50AASee Table 3 for the computed minimum values.NoteFor the p
30、urposes of design, the following tensile properties may beassumed for Grade A tubes:Tensile strength, min, ksi, MPa 47 325Yield strength, min, ksi, MPa 26 180Elongation in 2 in. or 50 mm, min, % 35TABLE 3 Minimum Elongation ValuesWall ThicknessElongation in 2 in. or50 mm, min, %Ain. mm516 (0.312) 8
31、30932 (0.281) 7.2 2914 (0.250) 6.4 27732 (0.219) 5.6 26316 (0.188) 4.8 24532 (0.156) 4 2218 (0.125) 3.2 21332 (0.094) 2.4 20116 (0.062) 1.6 18ACalculated elongation requirements shall be rounded to the nearest wholenumber.A 1020/A 1020M 02211.3.1 For Grade A, one flange test shall be made onspecimen
32、s from each of two tubes from each lot or fractionthereof.11.3.2 For Grades C and D, one flange test shall be made onspecimens from each of two tubes from each lot or fractionthereof. The width of the flange shall not be less than 75 % ofthat specified in specification A 450/A 450M.11.4 Crush TestFo
33、r Grade A, where specified in thepurchase order, one crush test shall be made on specimens fromeach of two tubes from each lot or fraction thereof.11.5 Reverse Flattening TestOne reverse flattening testshall be made on each 1500 ft 450 m of finished tubing.12. Nondestructive Examination12.1 Hydrosta
34、tic or Nondestructive Electric TestEachtube shall be subjected to either the hydrostatic or the nonde-structive electric test. The purchaser may specify which test isto be used.13. Surface Condition13.1 The finished tubes shall be free of scale. A slightamount of oxidation shall not be considered as
35、 scale.14. Forming Operations14.1 When inserted in a boiler or heat exchanger, tubes shallbe capable of withstanding expanding and beading withoutshowing cracks or flaws, or opening at the weld. Whenproperly manipulated, superheater tubes shall withstand allforging, welding, and bending operations n
36、ecessary for appli-cations without developing defects.15. Product Marking15.1 Marking shall be in accordance with SpecificationA 450/A 450M.15.2 The manufacturers name or symbol may be placedpermanently on each tube by rolling or light stamping beforenormalizing. If a single stamp is placed on the t
37、ube by hand,this mark should not be less than 8 in. 200 mm from one endof the tube.15.3 Bar CodingIn addition to the requirements in 15.1and 15.2, bar coding is acceptable as a supplemental identifi-cation method. The purchaser may specify in the order aspecific bar coding system to be used.16. Keyw
38、ords16.1 automatic welded steel tube; boiler tube; carbon; steeltube; welded steel tubeSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements may become part of the specification when specified inthe inquiry or invitation to bid, and production order or contract. These requirements shall
39、 not beconsidered unless specified in the order and the necessary tests shall be made at the mill.S1. Additional Testing of Welded Tubing for ASMERequirementsS1.1 The weld seam of each tube shall be subjected to anultrasonic inspection employing Practice E 273 or PracticeE 213 with the rejection cri
40、teria referenced in SpecificationA 450/A 450M.S1.2 If Practice E 273 is employed, a 100 % volumetricinspection of the entire length of each tube shall also beperformed using one of the nondestructive electric tests per-mitted by Specification A 450/A 450M.S1.3 The test methods described in the suppl
41、ement may notbe capable of inspecting the end portions of tubes. Thiscondition is referred to as end effect. This portion, as deter-mined by the manufacturer, shall be removed and discarded.S1.4 In addition to the marking prescribed in SpecificationA 450/A 450M, “S1” shall be added after the gradede
42、signation.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such r
43、ights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addition
44、al 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 AS
45、TM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).A 1020/A 1020M 023
