1、Designation: A 749/A749M 08Standard Specification forSteel, Strip, Carbon and High-Strength, Low-Alloy, Hot-Rolled, General Requirements for1This standard is issued under the fixed designation A 749/A749M; the number immediately following the designation indicates the yearof original adoption or, in
2、 the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript 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.1. Scope*1.1 T
3、his specification covers the general requirements forhot-rolled steel strip in coils and cut lengths. It applies tocarbon steel and high-strength, low-alloy steel furnished ashot-rolled.1.2 This specification is not applicable to hot-rolled heavy-thickness carbon sheet and strip coils (Specification
4、 A 635/A 635M), cold-rolled carbon steel strip (Specification A 109/A 109M), high-strength, low-alloy cold-rolled steel(Specifications A 606 and A 1008/A 1008M) or cold-rolledcarbon spring steel (Specification A 682/A 682M).1.3 In case of any conflict in requirements, the requirementsof the individu
5、al material specification shall prevail over thoseof this general specification.1.4 For the purposes of determining conformance with thisand the appropriate product specification referenced under 2.1,values shall be rounded to the nearest unit in the right handplace of figures used in expressing the
6、 limiting values inaccordance with the rounding method of Practice E29.1.5 Annex A1 lists permissible variations in dimensions andmass (Note 1) in SI metric units. The values listed are notexact conversions of the values listed in the inch-pound tables,but instead are rounded or rationalized values.
7、 Conformance toAnnex A1 is mandatory when the “M” specification is used.NOTE 1The term “weight” is used when inch-pound units are thestandard; however, under SI, the preferred term is “mass.”1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The va
8、lues 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 specification and the applicable material specifica-tions are expressed in both inch-po
9、und units and SI units.However, unless the order specifies the applicable “M” speci-fication designation (SI units), the material shall be furnishedto inch-pound units.2. Referenced Documents2.1 ASTM Standards:2A 109/A 109M Specification for Steel, Strip, Carbon (0.25Maximum Percent), Cold-RolledA 3
10、70 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 606 Specification for Steel, Sheet and Strip, High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, withImproved Atmospheric Corrosion ResistanceA 635/A 635M Specification for Steel, Sheet and Strip,Heavy-Thickness Coils, Hot-R
11、olled, Carbon, Structural,High-Strength Low-Alloy, and High-Strength Low-Alloywith Improved Formability, General Requirements forA 682/A 682M Specification for Steel, Strip, High-Carbon,Cold-Rolled, General Requirements ForA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products
12、 for ShipmentA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsA 1008/A 1008M Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy,High-Strength Low-Alloy with Improved Formability, So-lution Hardened, and Bake HardenableE11 Spec
13、ification for Wire Cloth and Sieves for TestingPurposesE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of
14、 SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved Oct. 1, 2008. Published October 2008. Originallyapproved in 1981. Last previous edition approved in 2002 as A 749 97 (2002).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
15、erviceastm.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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
16、United States.E 290 Test Methods for Bend Testing of Material forDuctility2.2 Military Standards:3MIL-STD-129 Marking for Shipment and Storage2.3 Federal Standards:3Fed. Std. No. 123 Marking for Shipments (Civil Agencies)Fed. Std. No. 183 Continuous Identification Marking of Ironand Steel Products3.
17、 Terminology3.1 Definitions of Terms Specific to This Standard: Descrip-tions of Terms Specific to This Standard:3.1.1 Steel Types:3.1.2 carbon steelthe designation for steel when no mini-mum content is specified or required for aluminum, chromium,cobalt, columbium, molybdenum, nickel, titanium, tun
18、gsten,vanadium, zirconium, or any element added to obtain a desiredalloying effect; when the specified minimum for copper doesnot exceed 0.40 %; or when the maximum content specified forany of the following elements does not exceed the percentagesnoted; manganese 1.65, silicon 0.60, or copper 0.60.D
19、iscussionIn all carbon steels small quantities of certainresidual elements unavoidably retained from raw materials aresometimes found which are not specified or required, such ascopper, nickel, molybdenum, chromium, etc. These elementsare considered as incidental and are not normally determined orre
20、ported.3.1.3 high-strength, low-alloy steela specific group ofsteels in which higher strength, and in some cases additionalresistance to atmospheric corrosion, are obtained by moderateamounts of one or more alloying elements.3.1.4 Product Types:3.1.5 hot-rolled stripmanufactured by hot rolling bille
21、tsor slabs to the required thickness. It may be produced singlewidth or by rolling multiple width and slitting to the desiredwidth. It can be supplied in coils or cut lengths as specified.Width, in. Thickness, in.Over Through Over Through. 312 0.044 0.203312 6 0.044 0.2036 12 0.044 0.230 exclWidth,
22、mm Thickness, mmOver Through Over Through. 100 1.2 5.0100 200 1.2 5.0200 300 1.2 6.0, exclHot-rolled, high-strength, low-alloy strip is commonly avail-able by size as follows:Width, in. Thickness, in.Over Through From ThroughCoils and at any place on the strip when narrower than 1 in. The given tole
23、rancesdo not include crown and therefore the tolerances for crown as shown in Table 5 are in addition to tolerances in Table 3.TABLE 4 Thickness Tolerances of Hot-Rolled StripA(Carbon and High-Strength, Low-Alloy Steel) Ordered to Minimum Thickness(Coils and Cut Lengths, Including Pickling)NOTE 1Mic
24、rometres used for measurement of thickness shall be constructed with either flat anvils having a minimum diameter of 0.188 in. orrounded anvils having a minimum radius of curvature of 0.100 in. Micrometres with pointed anvils are not suitable for thickness measurement.Specified Width, in. Thickness
25、Tolerance, Over Only, for Specified Minimum Thickness, in.Over Through Through 0.057Over 0.057 to0.118, inclOver 0.118 to0.187, inclOver 0.187 to0.203, inclOver 0.203 to0.230, excl. 312 0.006 0.008 0.010 0.012 . . .312 6 0.006 0.010 0.010 0.012 . . .6 12 0.008 0.010 0.010 0.012 0.012AMeasurements fo
26、r the above table are taken“in. from the edge of a strip on 1 in. or wider; and at any place on the strip when narrower than 1 in. The given tolerancesdo not include crown and therefore the tolerances for crown as shown in Table 5 are in addition to tolerances in Table 4.TABLE 5 Crown Tolerances of
27、Hot-Rolled Strip (Carbon andHigh-Strength, Low-Alloy Steel)(Coils and Cut Lengths, Including Pickled)Strip may be thicker at the center than at a point38 in. from theedge by the following amounts:Specified Width, in. Crown Tolerance, Over Only, for SpecifiedMinimum Thickness, in.Over ThroughThrough0
28、.118Over 0.118to 0.187,inclOver 0.187to 0.230,excl. 312 0.002 0.002 0.001312 6 0.003 0.002 0.0026 12 0.004 0.003 0.003TABLE 6 Width Tolerances of Hot-Rolled Strip (Carbon andHigh-Strength, Low-Alloy Steel)(Coils and Cut Lengths, Including Pickled)Specified Width,in.Width Tolerance, Over andUnder, in
29、.Over ThroughMill Edgeand SquareEdge StripCut EdgeThrough0.109 in.Over0.109 in.Through0.230 excl. 2132 0.008 0.01625364 0.008 0.016510116 0.010 0.01610 12332 0.016 0.016A 749/A749M 08412. Inspection12.1 When the purchasers order stipulates that inspectionand test (except product analyses) for accept
30、ance on the steelbe made prior to shipment from the mill, the manufacturer shallafford the purchasers inspector all reasonable facilities tosatisfy him that the steel is being produced and furnished inaccordance with the specification. Mill inspection by thepurchaser shall not interfere unnecessaril
31、y with the manufac-turers operation.13. Rejection and Rehearing13.1 Unless otherwise specified, any rejection shall bereported to the manufacturer within a reasonable time afterreceipt of material by the purchaser.13.2 Material that is reported to be defective subsequent tothe acceptance at the purc
32、hasers works shall be set aside,adequately protected, and correctly identified. The manufac-turer shall be notified as soon as possible so that an investiga-tion may be initiated.13.3 Samples that are representative of the rejected materialshall be made available to the manufacturer. In the event th
33、atthe manufacturer is dissatisfied with the rejection, he mayrequest a rehearing.14. Test Reports and Certification14.1 When test reports are required by the purchase order orthe material specification, the supplier shall report the results ofall tests required by the material specification and the
34、order.14.2 When certification is required by the purchase order,the supplier shall furnish a certification that the material hasbeen manufactured and tested in accordance with the require-ments of the material specification.14.3 A signature is not required on test reports or certifica-tions. However
35、, the document shall clearly identify the orga-nization submitting the document. Notwithstanding the ab-sence of a signature, the organization submitting the documentis responsible for the content of the document.14.4 When test reports are required, copies of the originalmaterial manufacturers test
36、report shall be included with anysubsequent test report.14.5 A material test report, certificate of inspection, orsimilar document printed from or used in electronic form froman electronic data interchange (EDI) transmission shall beregarded as having the same validity as a counterpart printed inthe
37、 certifiers facility. The content of the EDI transmitteddocument must meet the requirements of the invoked ASTMstandard(s) and conform to any existing EDI agreement be-tween the purchaser and the supplier. Notwithstanding theabsence of a signature, the organization submitting the EDItransmission is
38、responsible for the content of the report.NOTE 2The industry definition as invoked here is: EDI is thecomputer to computer exchange of business information in an agreed uponstandard format such as ANSI ASC X12.15. Marking15.1 As a minimum requirement, the material shall beidentified by having the ma
39、nufacturers name, ASTM designa-tion, weight, purchasers order number, and material identifi-cation legibly stenciled on top of each lift or shown on a tagattached to each coil or shipping unit.15.2 When specified in the contract or order, and for directprocurement by or direct shipment to the govern
40、ment, markingfor shipment, in addition to requirements specified in thecontract or order, shall be in accordance with MIL-STD-129for military agencies and in accordance with Fed. Std. No. 123for civil agencies.15.3 For Government procurement by the Defense SupplyAgency, strip material shall be conti
41、nuously marked for iden-tification in accordance with Fed. Std. No. 183.15.4 Bar coding is acceptable as a supplementary identifi-cation method. Bar coding should be consistent with theTABLE 7 Length Tolerances of Hot-Rolled Strip (Carbon and High-Strength Alloy)(Cut Lengths, Including Pickled)Speci
42、fied Widths, in.Length Tolerances over Specified Length, ft for Widths Given, in. No Tolerance UnderTo 5 ft, inclOver 5 to 10 ft,inclOver 10 to 20 ft,inclOver 20 to 30 ft,inclOver 30 to 40 ft,inclOver 40 ft,inclTo 3, incl14 “1234 1112Over 3 to 6, incl3812583412Over 6 to 12, incl1234 1114 112 134TABL
43、E 8 Camber TolerancesAof Hot-Rolled Strip(Carbon and High-Strength Low-Alloy)(Coils and Cut Lengths, Including Pickled, Applicable to MillEdge, Square Edge, and Slit or Cut Edge)NOTE 1 Camber is the deviation of a side edge from a straight line.The standard for measuring this deviation is based on a
44、ny 8-ft length.BItis obtained by placing an 8-ft straightedge on the concave side andmeasuring the maximum distance between the strip edge and the straight-edge.For strip wider than 112 in.14 in. in any 8 ft.For strip 112 in. and narrower12 in. in any 8 ft.AWhen the camber tolerances shown in the ab
45、ove table are not suitable for aparticular purpose, hot-rolled strip is sometimes machine straightened.BFor strip less than 8 ft tolerances are to be established in each instance.A formula for calculating camber is as follows:L23 C1645 C2in Lwhere:C1= Camber in 8 ft andC2= Camber in any given length
46、 L.TABLE 9 Flatness Tolerances of Hot-Rolled Strip(Carbon and High-Strength Low-Alloy)It has not been practicable to formulate flatness tolerances for hot-rolled carbonstrip steel because of the wide range of widths and thicknesses, and variety ofchemical compositions, mechanical properties and type
47、s, produced in coils andcut lengths.A 749/A749M 085Automotive Industry Action Group (AIAG) standard preparedby the primary metals subcommittee of the AIAG bar codeproject team.16. Packaging16.1 Unless otherwise specified, the strip shall be packagedand loaded in accordance with Practices A 700.16.2
48、When coils are ordered it is customary to specify aminimum or range of inside diameter, maximum outsidediameter, and a maximum coil weight, if required. The abilityof manufacturers to meet the maximum coil weights dependsupon individual mill equipment. When required, minimum coilweights are subject
49、to negotiation.17. Keywords17.1 carbon; steel; stripANNEX(Mandatory Information)A1. PERMISSIBLE VARIATIONS IN DIMENSIONS AND MASS IN SI UNITSA1.1 Listed in Tables A1.1-A1.7 are permissible varia-tions in dimensions and mass expressed in the InternationalSystem of Units (SI) terminology.TABLE A1.1 Thickness Tolerances of Hot-Rolled StripA(Carbon and High-Strength, Low-Alloy Steel) Ordered to Nominal Thickness(Coils and Cut Lengths, Including Pickled)NOTE 1Micrometres used for measurement of thickness shall be constructed with either
