1、Designation: A 250/A 250M 05Standard Specification forElectric-Resistance-Welded Ferritic Alloy-Steel Boiler andSuperheater Tubes1This standard is issued under the fixed designationA 250/A 250M; the number immediately following the designation indicates the yearof original adoption or, in the case o
2、f 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 several grades, designated T1,T1a, T1b, T2, T11, T12 and T22, of m
3、inimum-wall-thickness,electric-resistance-welded, carbon-molybdenum andchromium-molybdenum alloy-steel, boiler and superheatertubes.1.2 The tubing sizes and thicknesses usually furnished tothis specification are12 to 5 in. 12.7 to 127 mm in outsidediameter and 0.035 to 0.320 in. 0.9 to 8.1 mm, inclu
4、sive, inminimum wall thickness. Tubing having other dimensions maybe furnished, provided such tubes comply with all otherrequirements of this specification.1.3 Mechanical property requirements do not apply totubing smaller than18 in. 3.2 mm in inside diameter or 0.015in. 0.4 mm in thickness.1.4 An o
5、ptional supplementary requirement is provided fornon-destructive examination for certain ASME applications.1.5 The values stated in either inch-pound units or SI unitsare to be regarded separately as the standard. Within the text,the SI units are shown in brackets. The values stated in eachsystem ar
6、e not exact equivalents; therefore, each system mustbe used independently of 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 this specification is specified in the order.2. Referenced
7、Documents2.1 ASTM Standards:3A 1016/A 1016M Specification for General Requirementsfor Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-less Steel TubesE 213 Practice for Ultrasonic Examination of Metal Pipeand TubingE 273 Practice for Ultrasonic Examination of the WeldZone of Welded Pipe and
8、Tubing3. 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 (electric-resistance-welded tubes),3.1.3 Grade (Table 1),3.1.4
9、 Size (outside diameter or minimum wall thickness),3.1.5 Length (specific or random),3.1.6 Optional requirement (7.3.6),3.1.7 Test report required (see Certification Section ofSpecification A 1016/A 1016M),3.1.8 Specification designation, and3.1.9 Special requirements and any supplementary require-m
10、ents selected.4. General Requirements4.1 Product furnished under this specification shall conformto the applicable requirements of Specification A 1016/A 1016M, including any supplementary requirements that areindicated in the purchase order. Failure to comply with thegeneral requirements of Specifi
11、cationA 1016/A 1016M consti-tutes nonconformance with this specification. In case of con-flicts with the requirements of this specification and Specifi-cation A 1016/A 1016M, this specification shall prevail.5. Materials and Manufacture5.1 The steel shall be killed.5.2 The tubes shall be made by ele
12、ctric-resistance welding.5.3 Heat Treatment5.3.1 After welding, or when cold finished, after the finalcold-drawing pass, all tubes shall be heat treated and, except asprovided in 5.3.2, furnished in the full annealed, isothermalannealed, normalized, or normalized and tempered condition atthe option
13、of the manufacturer. If furnished in the normalizedand tempered condition, the minimum tempering temperature1This 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
14、Steel Tubular Products.Current edition approved March 1, 2005. Published March 2005. Originallyapproved in 1941. Last previous edition approved in 2004 as A 250/A 250M 04.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-250 in Section II of that Code.3For referenc
15、ed 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.Copyrig
16、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall be 1200 F 650 C, except T22 shall be tempered at1250 F 676 C minimum.5.3.2 When grades T1, T1a, T1b, and T2 are cold finished,the tubes may, at the option of the manufacturer, be heat tre
17、atedafter the final cold-drawing pass at a temperature of 1200 F orhigher, provided one of the heat treatments specified in 5.3.1was applied after welding.6. Chemical Composition6.1 The steel shall conform to the requirements given inTable 1.6.2 Product Analysis6.2.1 An analysis of either one length
18、 of flat-rolled stock orone tube shall be made on each heat. The chemical compositionthus determined shall conform to the requirements given inTable 1.6.2.2 If the original test for product analysis fails, retests oftwo additional lengths of flat-rolled stock or tubes shall bemade. Both retests for
19、the elements in question shall meet therequirements of the specification; otherwise all remainingmaterial in the heat or lot (See 8.1) shall be rejected or, at theoption of the producer, each length of flat-rolled stock or tubemay be individually tested for acceptance. Lengths of flat-rolled stock o
20、r tubes that do not meet the requirements of thespecification shall be rejected.7. Mechanical Requirements7.1 Tensile Requirements7.1.1 The material shall conform to the requirements as totensile properties given in Table 2.7.1.2 Table 3 gives the computed minimum elongationvalues for each132-in. 0.
21、8-mm decrease in wall thickness.Where the wall thickness lies between two values given inTable 3, the minimum elongation value shall be determined bythe following equation:E 5 48t 1 15.00 E 5 1.87t 1 15.00where:E = elongation in 2 in. 50 mm %, andt = actual thickness of specimen, in.mm.7.2 Hardness
22、RequirementsThe tubes shall have a hard-ness not exceeding the values given in Table 4.7.3 Mechanical Tests Required7.3.1 Tension TestOne 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 (
23、See 8.2).7.3.2 Flattening TestOne flattening test shall be made onspecimens from each end of one finished tube, not the one usedfor the flange test, from each lot (See 8.1).7.3.3 Flange TestOne flange test shall be made on speci-mens from each end of one finished tube, not the one used forthe flatte
24、ning test, from each lot (See 8.1).7.3.4 Reverse Flattening TestOne reverse flattening testshall be made on a specimen from each 1500 ft 450 m offinished tubing.7.3.5 Hardness TestBrinell and Rockwell hardness testsshall be made on specimens from two tubes from each lot (See8.2).7.3.6 Hydrostatic or
25、 Nondestructive Electric TestsEachtube shall be subjected to either the hydrostatic or the nonde-structive electric test. The purchaser may specify which is to beused.8. Sampling8.1 For flattening and flange requirements, the term lotapplies to all tubes prior to cutting of the same specified outsid
26、ediameter and specified wall thickness that are produced fromthe same heat of steel. When final heat treatment is in abatch-type furnace, a lot shall include only those tubes of thesame size and from the same heat that are heat treated in thesame furnace charge. When the final heat treatment is in a
27、continuous furnace, the number of tubes of the same size andTABLE 1 Chemical RequirementsElement Composition, %GradeT1GradeT1aGradeT1bGradeT2GradeT11GradeT12GradeT22Carbon 0.100.20 0.150.25 0.14 max 0.100.20 0.050.15 0.050.15 0.15 maxManganese 0.300.80 0.300.80 0.300.80 0.300.61 0.300.60 0.300.61 0.
28、300.60Phosphorus, max 0.025 0.025 0.025 0.025 0.025 0.030 0.025Sulfur, max 0.025 0.025 0.025 0.020 0.020 0.020 0.020Silicon 0.100.50 0.100.50 0.100.50 0.100.30 0.501.00 0.50 max 0.50 maxMolybdenum 0.440.65 0.440.65 0.440.65 0.440.65 0.440.65 0.440.65 0.871.13Chromium . . . . . . . . . 0.500.81 1.001
29、.50 0.801.25 1.902.60TABLE 2 Tensile RequirementsGrade T1 T1a T1b T2 T11 T12 T22Tensile strength, min, ksi MPa 55 380 60 415 53 365 60 415 60 415 60 415 60 415Yield strength, min, ksi MPa 30 205 32 220 28 195 30 205 30 205 32 220 30 205Elongation in 2 in. or 50 mm, min, % 30 30 30 30 30 30 30For lon
30、gitudinal strip tests a deduction shall be made for each132-in. 0.8-mm decrease in wall thickness below516 in.8 mm from the basic minimum elongation of the followingpercentage points1.50A1.50A1.50A1.50A1.50A1.50A1.50AASee Table 3 for the computed minimum values.A 250/A 250M 052from the same heat in
31、a lot shall be determined from the sizeof the tubes given in Table 5.8.2 For tensile and hardness test requirements, the term lotapplies to all tubes prior to cutting, of the same specifiedoutside diameter and specified wall thickness that are producedfrom the same heat of steel. When final heat tre
32、atment is in abatch-type furnace, a lot shall include only those tubes of thesame size and the same heat that are heat treated in the samefurnace charge. When the final heat treatment is in a continuousfurnace, a lot shall include all tubes of the same size and heat,heat treated in the same furnace
33、at the same temperature, timeat heat, and furnace speed.9. Forming Operations9.1 Tubes when inserted in the boiler shall stand expandingand beading without showing cracks or flaws. Superheatertubes when properly manipulated shall stand all forging,welding, and bending operations necessary for applic
34、ationwithout developing defects.10. Product Marking10.1 In addition to the marking prescribed in SpecificationA 1016/A 1016M, the marking shall include the words “Elec-tric Resistance-Welded Steel.”11. Keywords11.1 boiler tube; resistance welded steel tube; steel tube,alloy; superheater tube; welded
35、 steel tubeTABLE 3 Minimum Elongation ValuesWall Thickness Elongation in 2 in. or50 mm, min,%Ain. mm Grades T1, T1a, T1b,T2, T11, T12, and T22516 (0.312) 8 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 18AC
36、alculated elongation requirements shall be rounded to the nearest whole number.TABLE 4 Hardness RequirementsGrade Brinell HardnessNumber (Tubes 0.200in. 5.1 mm and overin wall thickness), HBWRockwell HardnessNumber (Tubes lessthan 0.200 in. 5.1 mmin wall thickness), HRBT1 146 80T1a 153 81T1b 137 77T
37、2 163 85T11 163 85T12 163 85T22 163 85TABLE 5 Number of Tubes in a Lot Heat Treated by theContinuous ProcessSize of Tube Size of Lot2 in. 50.8 mm and over in outside diameter and0.200 in. 5.1 mm and over in wall thicknessnot more than 50tubesLess than 2 in. 50.8 mm but over 1 in. 25.4 mmin outside d
38、iameter or over 1 in. 25.4 mm inoutside diameter and under 0.200 in. 5.1 mm inwall thicknessnot more than 75tubes1 in. 25.4 mm or less in outside diameter not more than 125tubesA 250/A 250M 053SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements may become a part of the specification w
39、hen specifiedin the inquiry or invitation to bid, and purchase order or contract. These requirements shall not beconsidered, unless specified in the order and the necessary tests shall be made at the mill.S1. Additional Testing of Welded Tubing for 100 % JointEfficiency in Certain ASME ApplicationsS
40、1.1 Where this supplement is specified in the purchaseorder, in certain ASME applications it is permissible to use100 % joint efficiency for the longitudinal weld, provided thefollowing additional requirements are met:S1.1.1 Each tube shall be subjected to an ultrasonic inspec-tion employing Practic
41、es E 273 or E 213 with the rejectioncriteria referenced in Specification A 1016/A 1016M.S1.1.2 If Practice E 273 is employed, a 100 % volumetricinspection of the entire length of each tube shall also beperformed using one of the non-destructive electric testspermitted by Specification A 1016/A 1016M
42、.S1.1.3 The test methods described in the supplement maynot be 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.S1.1.4 In addition to the marking prescribed in SpecificationA
43、1016/A 1016M, “S1” shall be added after the gradedesignation.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this specification since the last issue,A 250/A 250M 04, that may impact the use of this specification. (Approved March 1, 2005)(1) Clarified when ASME requ
44、est applied in S1.Committee A01 has identified the location of selected changes to this specification since the last issue,A 250/A 250M 95(2001), that may impact the use of this specification. (Approved March 1, 2004)(1) Revised and reformatted extensively to adopt the newgeneral requirements specif
45、ication and conform to the guide-lines for form and style.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 pate
46、nt rights, and the riskof infringement of such rights, 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 eith
47、er for revision of this standard or for additional 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 h
48、earing you shouldmake your views known to the ASTM 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 250/A 250M 054
