1、Designation: A490M 101Standard Specification forHigh-Strength Steel Bolts, Classes 10.9 and 10.9.3, forStructural Steel Joints (Metric)1This standard is issued under the fixed designation A490M; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1NOTE7.2.1 was editoriall
3、y corrected in November 2011.1. Scope*1.1 This specification covers two types of quenched andtempered alloy steel, metric heavy hex structural bolts havinga tensile strength of 1040 to 1210 MPa.1.2 These bolts are intended for use in structural connec-tions comparable to those covered under the requ
4、irements ofthe Specification for Structural Joints Using ASTM A325 andA490 bolts, approved by the Research Council on StructuralConnections; endorsed by the American Institute of SteelConstruction and by the Industrial Fastener Institute.21.3 The bolts are furnished in nominal bolt diameters M12to M
5、36, inclusive. They are designated by type denotingchemical composition as follows:Type DescriptionType 1 Medium carbon alloy steelType 2 Withdrawn in 2002Type 3 Weathering steel1.4 This specification is applicable to metric heavy hexstructural bolts and alternate designs as established by theResear
6、ch Council in its publication, Specification for StructuralJoints Using ASTM A325 and A490 bolts.1.5 For inch-pound bolts, see Specification A490.1.6 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.7 The following safety hazar
7、ds caveat pertains only to theTest Methods portion, Section 13, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and det
8、ermine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:3A325 Specification for Structural Bolts, Steel, Heat Treated,120/105 ksi Minimum Tensile StrengthA490 Specification for Structural Bolts, Alloy Steel, HeatTreated, 150 ksi Minimum Tensile Stre
9、ngthA490M Specification for High-Strength Steel Bolts, Classes10.9 and 10.9.3, for Structural Steel Joints (Metric)A563M Specification for Carbon and Alloy Steel Nuts(Metric)A751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsD3951 Practice for Commercial PackagingE
10、384 Test Method for Knoop and Vickers Hardness ofMaterialsE709 Guide for Magnetic Particle TestingE1444 Practice for Magnetic Particle TestingF436M Specification for Hardened Steel Washers (Metric)F568M Specification for Carbon and Alloy Steel ExternallyThreaded Metric Fasteners (Metric)F606M Test M
11、ethods for Determining the MechanicalProperties of Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric)F788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF959M Specification for Compressible-Washer-Type DirectTension Indicators
12、 for Use With Structural Fasteners (Met-ric)F1136M Specification for Zinc/Aluminum Corrosion Pro-tective Coatings for Fasteners (Metric)F1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2328M Test Method
13、 for Determining Decarburization andCarburization in Hardened and Tempered Threaded Steel1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts, Rivets and Washers.Current edition approved Dec. 1, 20
14、10. Published January 2011. Originallyapproved in 1982. Last previous edition approved in 2009 as A 490M 09a.DOI:10.1520/A0490M-10E01.2Available from American Institute of Steel Construction (AISC), One E.Wacker Dr., Suite 700, Chicago, IL 60601-2001, http:/www.aisc.org3For referenced ASTM standards
15、, visit the ASTM webbiest, 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 webbiest.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM Interna
16、tional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Bolts, Screws and Studs (Metric)G101 Guide for Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels2.2 ASME Standards:4B1.13M Metric Screw ThreadsB18.2.3.7M Metric Heavy Hex Structural BoltsB18.
17、24 Part Identifying Number (PIN) Code System Stan-dard for B18 Fastener Products2.3 ISO Standards:47412 Hexagon Bolts for High Strength StructuralBolting With Large Width Across Flats (Short ThreadLength)Product Grade CProperty Classes 8.8 and 10.92.4 IFI Standard5:IFI 144 Test Evaluation Procedures
18、 for Coating Qualifica-tion Intended for Use on High-Strength Structural Bolts3. Terminology3.1 Terms used in this specification are defined in Termi-nology F1789, unless otherwise defined herein.4. Ordering Information4.1 Orders for bolts under this specification shall include thefollowing (see Not
19、e 1):4.1.1 Quantity (number of pieces of bolts and accessories);4.1.2 Size, including nominal bolt diameter, thread pitch,and bolt length;4.1.3 Name of product: metric heavy hex structural bolts;4.1.4 Type of bolt (Type 1 or 3). When type is not specified,either Type 1 or Type 3 shall be furnished a
20、t the suppliersoption;4.1.5 ASTM designation and year of issue;4.1.6 Other components such as nuts, washers, and washer-type direct tension indicators, if required;4.1.7 Certification, if required (see Section 16); and4.1.8 Protective Coating per Specification F1136M, Grade3, if required. See 5.3.4.
21、1.9 Special requirements, if required.4.1.10 For establishment of a part identifying system, seeASME B18.24.NOTE 1A typical ordering description follows: 1000 pieces M24 3 33 100 mm long, heavy hex structural bolt, Type 1, ASTM A 490 M 03;each with two hardened washers, ASTM F436M, Type 1; and one h
22、eavyhex nut, ASTM A563M, Grade DH.4.2 Recommended Nuts4.2.1 Nuts conforming to the requirements of SpecificationA563M are the recommended nuts for use with SpecificationA 490M heavy hex structural bolts. The nuts shall be of theclass and have a surface finish for each type of bolt as follows.Bolt Ty
23、pe and Finish Nut Class and Finish1, plain (uncoated) A563M10S, 10S3, plain (uncoated)1, coated in accordance withF1136M, Grade 3A563M10S, 10S3coated in accordance withF1136M, Grade 53, weathering steel A563M10S3, weathering steel4.3 Recommended Washers4.3.1 Washers conforming to Specification F436M
24、 are therecommended washers for use with Specification A490Mheavy hex structural bolts. The washers shall have a surfacefinish for each type of bolt as follows.Bolt Type and Finish Washer Finish1, plain (uncoated) plain (uncoated)1, coated in accordance withF1136M, Grade 3coated in accordance withF1
25、136M, Grade 33, weathering steel weathering steel4.4 Other Accessories4.4.1 When compressible washer type tension indicators arespecified to be used with these bolts, they shall conform toSpecification F959M, Type 10.9.5. Materials and Manufacture5.1 Heat TreatmentType 1 and Type 3 bolts shall be he
26、attreated by quenching in oil from the austenitic temperature andthen tempered by reheating to a temperature of not less than425C.5.2 ThreadingThe threads shall be cut or rolled.5.3 Protective Coatings:5.3.1 When a protective coating is required and specified,the bolts shall be coated with Zinc/Alum
27、inum CorrosionProtective Coatings in accordance with F1136M Grade 3,which has been qualified in accordance with IFI 1446.5.3.2 No other metallic coatings are permitted unless autho-rized by Committee F16. Future consideration of any coating4Available from American Society of Mechanical Engineers (AS
28、ME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.5Available from Industrial Fastener Institute (IFI), 6363 Oak Tree Boulevard,Independence, OH 44131, www.industrial-fasteners.org.6Supporting data have been filed at ASTM International Headquarters and
29、maybe obtained by requesting Research Report RR:F161001.TABLE 1 Chemical Requirements for Type 1 BoltsElement Heat Analysis, % ProductAnalysis, %CarbonFor sizes through M30 0.300.48 0.280.50For size M36 0.350.53 0.330.55Phosphorus, max 0.040 0.045Sulfur, max 0.040 0.045Alloying Elements See 6.1 TABL
30、E 2 Chemical Requirements for Type 3 BoltsElement Heat Analysis, % Product Analysis, %CarbonSizes M20 and smaller 0.200.53 0.190.55Sizes larger than M20. 0.300.53 0.280.55Manganese, min 0.40 0.37Phosphorus, max 0.035 0.040Sulfur, max 0.040 0.045Copper 0.200.60 0.170.63Chromium, min 0.45 0.42Nickel,
31、minor0.20 0.17Molybdenum, min 0.15 0.14A490M 1012will be based on a review of test results submitted to Commit-tee F16 in accordance with the requirements of IFI 144.6. Chemical Composition6.1 Type 1 bolts shall be alloy steel conforming to thechemical composition requirements in Table 1. The steel
32、shallcontain sufficient alloying elements to qualify it as an alloysteel (see Note 2).NOTE 2Steel is considered to be alloy, by theAmerican Iron and SteelInstitute, when the maximum of the range given for the content of alloyingelements exceeds one or more of the following limits: manganese, 1.65 %;
33、silicon, 0.60 %; copper, 0.60 %; or in which a definite range or a definiteminimum quantity of any of the following elements is specified orrequired within the limits of the recognized field of constructional alloysteels: aluminum, chromium up to 3.99 %, cobalt, columbium, molybde-num, nickel, titan
34、ium, tungsten, vanadium, zirconium, or any otheralloying elements added to obtain a desired alloying effect.6.2 Type 3 bolts shall be weathering steel conforming to thechemical composition requirements in Table 2. See GuideG101 for methods of estimating the atmospheric corrosionresistance of low all
35、oy steel.6.3 Product analyses made on finished bolts representingeach lot shall conform to the product analysis requirementsspecified in Table 1 or Table 2, as applicable.6.4 Applications of heats of steel to which bismuth, sele-nium, tellurium, or lead has been intentionally added shall notbe permi
36、tted for bolts. Compliance with this requirement shallbe based on a statement on the steel certificate indicating thatthese elements were not intentionally added.6.5 Chemical analyses shall be performed in accordancewith Test Methods, Practices, and Terminology A751.7. Mechanical Properties7.1 Hardn
37、essThe bolts shall conform to the hardnessspecified in Table 3.7.2 Tensile Properties:7.2.1 Except as permitted in 7.2.2 for long bolts and 7.2.3for short bolts, nominal bolt diameters M24 and smaller havinga length of 214 D and longer, and nominal bolt diameters largerthan M24 having a length of 3D
38、 and longer shall be wedgetested full size and shall conform to the minimum andmaximum wedge tensile load, and proof load or alternativeproof load specified in Table 4. The load achieved during proofload testing shall be equal to or greater than the specified proofload.7.2.2 When the length of the b
39、olt makes full-size testingimpractical, machined specimens shall be tested and shallconform to the requirements specified in Table 5. When boltsare tested by both full-size and machined specimen methods,the full-size test shall take precedence.7.2.3 Nominal bolt diameters M24 and smaller having alen
40、gth shorter than 214 D down to 2D inclusive, which cannotbe wedge tensile tested shall be axially tension tested full sizeand shall conform to the minimum tensile load and proof loador alternate proof load specified in Table 4. Nominal boltdiameters M24 and smaller having a length shorter than 2Dwhi
41、ch cannot be axially tensile tested shall be qualified on thebasis of hardness.7.2.4 For bolts on which both hardness and tension tests areperformed, acceptance based on tensile requirements shall takeprecedence in the event of low hardness readings.8. Carburization/Decarburization8.1 DefinitionThis
42、 test is intended to evaluate the pres-ence or absence of carburization and decarburization as deter-mined by the difference in microhardness near the surface andcore.8.2 Requirements:8.2.1 CarburizationThe bolts shall show no evidence of acarburized surface when evaluated in accordance with thehard
43、ness methods established in Test Method F2328M.8.2.2 DecarburizationHardness value differences shallnot exceed the requirements set forth for decarburization inTest Method F2328M materials.8.3 ProcedureTesting for carburization/decarburizationshall be performed in accordance with the microhardness(r
44、eferee) methods established in Test Method F2328M.9. Dimensions9.1 Head and Body:9.1.1 The bolts shall conform to the dimensions for heavyhex structural bolts specified in ASME B18.2.3.7M for nomi-nal bolt diameter M16 to M36 inclusive and ISO 7412 for sizeM12.9.2 Threads:9.2.1 Threads shall Metric
45、Coarse Thread Series as specifiedin ASME B1.13M, and shall have Grade 6g tolerance.9.2.2 The thread length shall not be changed from thatspecified for heavy hex structural bolts in ASME B18.2.3.7Mand ISO 7412 in 9.1.1. Bolts requiring thread lengths otherthan those required by this specification sha
46、ll be ordered underSpecification F568M, Class 10.9 and 10.9.3.10. Workmanship10.1 The allowable limits, inspection, and evaluation of thesurface discontinuities, quench cracks, forging cracks, headbursts, shear bursts, seams, folds, thread laps, voids, toolmarks, nicks, and gouges shall be in accord
47、ance with Specifi-cation F788/F788M.11. Magnetic Particle Inspection for LongitudinalDiscontinuities and Transverse Cracks11.1 Requirements:11.1.1 Each sample representative of the lot shall be mag-netic particle inspected for longitudinal discontinuities andtransverse cracks.TABLE 3 Hardness Requir
48、ements for Bolt SizesM12 to M36 InclusiveNominal BoltDiameter, mmLengthABrinell Rockwell Cmin max min maxM12 to M24, Less than 2D 311 352 33 38inclusive 2D and longer . . . 352 . . . 38Over M24 to M36, Less than 3D 311 352 33 38inclusive 3D and longer . . . 352 . . . 38AHeavy hex structural bolts M2
49、4 and smaller and shorter than 2D are subjectonly to minimum and maximum hardness. Heavy hex structural bolts larger thanM24 to M36 inclusive and shorter than 3D are subject only to minimum andmaximum hardness.A490M 101311.1.2 The lot, as represented by the sample, shall be freefrom nonconforming bolts, as defined in 11.3, when inspectedin accordance with 11.2-11.2.4.11.2 Inspection Procedure:11.2.1 The inspection sample shall be selected at randomfrom each lot in accordance with Table 6 and examined forlongitudinal discontinuities and trans
