ASTM A618 A618M-2004 Standard Specification for Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing.pdf
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1、Designation: A 618/A 618M 04Standard Specification forHot-Formed Welded and Seamless High-Strength Low-AlloyStructural Tubing1This standard is issued under the fixed designation A 618/A 618M; the number immediately following the designation indicates the yearof original adoption or, in the case of r
2、evision, 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specifica
3、tion covers grades of hot-formed weldedand seamless high-strength low-alloy square, rectangular,round, or special shape structural tubing for welded, riveted, orbolted construction of bridges and buildings and for generalstructural purposes. When the steel is used in welded construc-tion, the weldin
4、g procedure shall be suitable for the steel andthe intended service.1.2 Grade II has atmospheric corrosion resistance equiva-lent to that of carbon steel with copper (0.20 minimum Cu)Grades Ia and Ib have atmospheric corrosion resistance sub-stantially better than that of Grade II (Note 1). When pro
5、perlyexposed to the atmosphere, Grades Ia and Ib can be used bare(unpainted) for many applications. When enhanced corrosionresistance is desired, Grade III, copper limits may be specified.NOTE 1For methods of estimating the atmospheric corrosion resis-tance of low alloy steels see Guide G 101 or act
6、ual data.1.3 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 shallbe used independently of the other. Combining val
7、ues from thetwo systems may result in nonconformance with the standard.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic ShipmentA 751 Test Me
8、thods, Practices, and Terminology forChemical Analysis of Steel ProductsG 101 Guide for Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels3. Ordering Information3.1 Orders for material under this specification shouldinclude the following as required to describe the materialadequately
9、:3.1.1 Quantity (feet, metres, or number of lengths),3.1.2 Grade (Table 1 and Table 2),3.1.3 Material (round, square, or rectangular tubing),3.1.4 Method of manufacture (seamless, buttwelded, orhot-stretch-reduced electric-resistance welded),3.1.5 Size (outside diameter and nominal wall thickness fo
10、rround tubing and the outside dimensions and calculated nomi-nal wall thickness for square and rectangular tubing),3.1.6 Length (specific or random, see 8.2),3.1.7 End condition (see 9.2),3.1.8 Burr removal (see 9.2),3.1.9 Certification (see 12.1),3.1.10 Specification designation (A 618 or A 618M, i
11、nclud-ing yeardate),3.1.11 End use, and3.1.12 Special requirements.4. Process4.1 The steel shall be made by one or more of the followingprocesses: open-hearth, basic-oxygen, or electric-furnace.4.2 Steel may be cast in ingots or may be strand cast. Whensteels of different grades are sequentially str
12、and cast, identifi-cation of the resultant transition material is required. Theproducer shall remove the transition material by any estab-lished procedure that positively separates the grades.5. Manufacture5.1 The tubing shall be made by the seamless, furnace-buttwelded (continuous-welded), or hot-s
13、tretch-reducedelectric-resistance-welded process.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 March 1, 2004. Published
14、March 2004. Originallyapproved in 1968. Last previous edition approved in 2001 as A 61801.2For 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 Sum
15、mary page onthe ASTM website.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.6. Chemical Composition6.1 When subjected to the heat and product analysis, respec-tively,
16、 the steel shall conform to the requirements prescribed inTable 1.6.1.1 For Grades Ia and Ib, the choice and use of alloyingelements, combined with carbon, manganese, and sulfur withinthe limits prescribed in Table 1 to give the mechanicalproperties prescribed in Table 2 and to provide the atmospher
17、iccorrosion resistance of 1.2, should be made by the manufac-turer and included and reported in the heat analysis forinformation purposes only to identify the type of steel applied.For Grades Ia and Ib material, the atmospheric corrosion-resistance index, calculated on the basis of the chemicalcompo
18、sition of the steel as described in Guide G 101, shall be6.0 or higher.NOTE 2The user is cautioned that the Guide G 101 predictiveequation for calculation of an atmospheric corrosionresistance index hasbeen verified only for the composition limits stated in that guide.6.1.2 When Grade III is require
19、d for enhanced corrosionresistance, copper limits may be specified and the minimumcontent shall be 0.20 % by heat analysis and 0.18 % by productanalysis.6.2 Heat AnalysisAn analysis of each heat of open-hearth,basic-oxygen, or electric-furnace steel shall be made by themanufacturer. This analysis sh
20、all be made from a test ingottaken during the pouring of the heat. The chemical compositionthus determined shall conform to the requirements specified inTable 1 for heat analysis.6.3 Product Analysis:6.3.1 An analysis may be made by the purchaser fromfinished tubing manufactured in accordance with t
21、his specifi-cation, or an analysis may be made from flat-rolled stock fromwhich the welded tubing is manufactured. When productanalyses are made, two sample lengths from a lot of each 500lengths, or fraction thereof, shall be selected. The specimensfor chemical analysis shall be taken from the sampl
22、e lengths inaccordance with the applicable procedures of Test Methods,Practices, and Terminology A 751. The chemical compositionthus determined shall conform to the requirements specified inTable 1 for product analysis.6.3.2 In the event the chemical composition of one of thesample lengths does not
23、conform to the requirements shown inTable 1 for product analysis, an analysis of two additionallengths selected from the same lot shall be made, each of whichshall conform to the requirements shown in Table 1 for productanalysis, or the lot is subject to rejection.7. Mechanical Requirements7.1 Tensi
24、le Properties:7.1.1 The material, as represented by the test specimen,shall conform to the requirements prescribed in Table 2.7.1.2 Elongation may be determined on a gage length ofeither 2 in. 50 mm or 8 in. 200 mm at the manufacturersoption.7.1.3 For material under516 in. 8.0 mm in thickness, adedu
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