1、Designation: A1090/A1090M 14Standard Specification forForged Rings and Hollows Produced from Steels withAtmospheric Corrosion Resistance1This standard is issued under the fixed designation A1090/A1090M; the number immediately following the designation indicates theyear of original adoption or, in th
2、e case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers high-strength, low-alloy steelring and hollow forgings inten
3、ded primarily for use as baseplates in welded tubular structures. However use of thisspecification is not restricted to such applications and it may beused in other applications for which the attributes of thematerials, as defined by this specification, are appropriate.1.2 The atmospheric corrosion
4、resistance of these steels inmost environments is substantially better than that of carbonstructural steel with or without copper addition (see Note 1).When exposed to the atmosphere, this steel is suitable for manyapplications in the bare (unpainted) condition.NOTE 1See Guide G101 for methods of es
5、timating the atmosphericcorrosion resistance of low-alloy steels.1.3 The thickness of forgings is limited only by the capacityof the composition to meet the specified mechanical propertyrequirements; however, current practice normally limits thethickness of forgings furnished under this specificatio
6、n to arange of 2 to 6 in. 51 to 152 mm.NOTE 2When the steel is to be welded, a welding procedure suitablefor the grade of steel and intended use or service should be used. SeeAppendix X3 of Specification A6/A6M for information on weldability.1.4 The text of this specification contains notes, footnot
7、es,or both that provide explanatory material. Such notes andfootnotes, excluding those in tables and figures, do not containany mandatory requirements.1.5 Supplementary requirements are available but shallapply only when specified by the purchaser at the time ofordering.1.6 The values stated in eith
8、er SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 This standar
9、d 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 limitations prior to use.2. Referenced Documents2.1 ASTM
10、 Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA788/A788M Specification for Steel Forgings, General Re-quirementsA1058 Test Methods for Mechanical Test
11、ing of SteelProductsMetricE112 Test Methods for Determining Average Grain SizeG101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-Alloy Steels3. Ordering Information3.1 In addition to the ordering information required bySpecification A788/A788M, the purchaser shall specify:3.1.1 G
12、rade designation.3.1.2 Surface condition (for example, as-forged, rough ma-chined etc.).3.1.3 Include a sketch or written description of the forgingwith the inquiry and order.3.2 The purchaser may specify:3.2.1 Limits on repair welding, if permissible.3.2.2 Non-destructive evaluation, in which case
13、reportingand acceptance criteria must be provided.4. Materials and Manufacture4.1 The steel shall be deoxidized and shall be capable ofachieving an ASTM grain size of 6 or finer when evaluatedusing any of the methods in Test Methods E112.1This specification is under the jurisdiction of ASTM Committe
14、e A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1, 2014. Published March 2014. DOI: 10.1520/A1090_A1090M-142For referenced ASTM standards, visit the ASTM website, www.astm.org, orcon
15、tact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Chemical Compositio
16、n5.1 The heat analysis shall conform to the requirementsprescribed in Table 1.5.2 Product analysis shall be conducted once per heat andshall conform to the requirements prescribed in Table 1 subjectto the product tolerances in Specification A788/A788M.5.3 The atmospheric corrosion-resistance index,
17、calculatedon the basis of the heat analysis of the steel, as described inGuide G101 shall be 6.0 or higher.NOTE 3The user is cautioned that the Guide G101 predictive equation(predictive method based on the data of Larabee and Coburn) forcalculation of an atmospheric corrosion-resistance index has on
18、ly beenverified for the composition limits stated in the guide.5.4 When required, the manufacturer shall supply evidenceof corrosion resistance satisfactory to the purchaser in accor-dance with a recognized test method.6. General Requirements for Delivery6.1 Forgings produced to this specification s
19、hall conform tothe current edition of Specification A788/A788M unless aconflict exists, in which case this specification shall prevail.7. Heat Treatment7.1 Materials supplied to this specification shall bequenched and tempered and shall meet the requirements ofTable 2.8. Mechanical Requirements8.1 T
20、ension TestsThe steel shall conform to the require-ments for longitudinal tensile properties prescribed in Table 2when tested in accordance with Test Methods A370 or TestMethods A1058.8.2 Charpy V-Notch Impact Tests:8.2.1 The steel, as represented by the Charpy V-notch test,shall conform to the impa
21、ct test requirements of Table 3 whentested in accordance with Test Methods A370 or Test MethodsA1058.8.3 Test FrequencyTesting shall be conducted a minimumof once per heat. When tests are taken from forgings that werenot heat treated with the product to be qualified, the forgingtested shall have a t
22、hickness equal to or greater than the partsto be qualified. The forging tested shall be processed usingthermal cycles that are within 25F 10C of the thermalcycles used on the forgings to be qualified.8.4 Test Location:8.4.1 The test specimen shall be extracted from an integralprolongation or a sacri
23、ficial forging and the center of the gaugelength of tension test specimens shall be located midwaybetween the inner and outer diameter surfaces and a minimumof one quarter the thickness from all other surfaces.8.4.2 As an alternate to removing test specimens fromintegral prolongations or sacrificial
24、 forgings, test specimensmay be extracted from separately forged test blocks. The testblock shall not receive more reduction than the part it qualifies.Test specimens cut from test blocks shall be extracted in sucha manner that the center of the gauge length is located at themid-thickness and a mini
25、mum of one quarter the thicknessfrom all other heat-treated surfaces.9. Keywords9.1 atmospheric corrosion resistance; bars; bolted construc-tion; bridges; buildings; durability; forgings; high strength; lowalloy; riveted constructions; shapes; steel; structural steel;weight; welded constructionTABLE
26、 1 Chemical RequirementsNOTE 1Values are maximums unless a minimum or a range isspecified. Where “.” appears in this table, there is no requirement.Element Grade A Grade B Grade CCarbonA0.19 0.20 0.17ManganeseA0.80 to 1.35 0.75 to 1.35 0.50 to 1.20Phosphorous 0.025 0.025 0.025Sulfur 0.025 0.025 0.02
27、5Silicon 0.30 to 0.65 0.15 to 0.50 0.25 to 0.50Nickel 0.40 0.50 0.40Chromium 0.40 to 0.70 0.40 to 0.70 0.40 to 0.70Molybdenum . . 0.10Copper 0.25 to 0.40 0.20 to 0.40 0.30 to 0.50Vanadium 0.02 to 0.10 0.01 to 0.10 .Columbium . . 0.005 to 0.05BAFor each reduction of 0.01 percentage point below the sp
28、ecified maximum forcarbon, an increase of 0.06 percentage point above the specified maximum formanganese is permitted up to a maximum of 1.50 %.BFor sections under12 in. 13 mm, the columbium is waived.TABLE 2 Tensile RequirementsYield Point, min,ksi MPaTensile Strength, min,ksi MPaElongation in2 in.
29、 50 mmmin, %60 415 75 520 18TABLE 3 Charpy V-Notch RequirementsAverage Absorbed Energy, ft-lb J Temperature, F C15 20 -20 -29A1090/A1090M 142ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this
30、 standard are expressly advised that determination of the validity of any such patent 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 year
31、s andif not revised, either reapproved or withdrawn. Your comments are invited either 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 committ
32、ee, which you may attend. If you feel that your comments have not received a fair hearing 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
33、-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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A1090/A1090M 143
