1、Designation: A749/A749M 08A749/A749M 14Standard Specification forSteel, Strip, Carbon and High-Strength, Low-Alloy, Hot-Rolled, General Requirements for1This standard is issued under the fixed designation A749/A749M; the number immediately following the designation indicates the yearof original adop
2、tion or, in 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 U.S. Department of Defens
3、e.1. Scope*1.1 This specification covers the general requirements for hot-rolled steel strip in coils and cut lengths. It applies to carbon steeland high-strength, low-alloy steel furnished as hot-rolled.1.2 This specification is not applicable to hot-rolled heavy-thickness carbon sheet and strip co
4、ils (Specification A635/A635MA1018/A1018M), cold-rolled carbon steel strip (Specification A109/A109M), high-strength, low-alloy cold-rolled steel(Specifications A606A606/A606M and A1008/A1008M) or cold-rolled high carbon spring steel (Specification A682/A682MA684/A684M).1.3 In case of any conflict i
5、n requirements, the requirements of the individual material specification shall prevail over those ofthis general specification.1.4 For the purposes of determining conformance with this and the appropriate product specification referenced under 2.1,values shall be rounded to the nearest unit in the
6、right hand place of figures used in expressing the limiting values in accordancewith the rounding method of Practice E29.1.5 Annex A1 lists permissible variations in dimensions and mass (Note 1) in SI metric units. The values listed are not exactconversions of the values listed in the inch-pound tab
7、les, but instead are rounded or rationalized values. Conformance to AnnexA1 is mandatory when the “M” specification is used.NOTE 1The term “weight” is used when inch-pound units are the standard; however, under SI, the preferred term is “mass.”1.6 The values stated in either SI units or inch-pound u
8、nits are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.7 This specification and the applicabl
9、e material specifications are expressed in both inch-pound units and SI units. However,unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-poundunits.2. Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel,
10、 Strip, Carbon (0.25 Maximum Percent), Cold-RolledA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA606A568/A568M Specification for Steel, Sheet and Strip, Sheet, Carbon, Structural, and High-Strength, Low-Alloy,Hot-Rolled and Cold-Rolled, with Improved Atmospheric Corrosion
11、 ResistanceGeneral Requirements forA635/A635MA606/A606M Specification for Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled, Alloy, Carbon,Structural, High-Strength Low-Alloy, and High-Strength Low-Alloy with Improved Formability, General RequirementsforHigh-Strength, Low-Alloy, Hot-Rolled a
12、nd Cold-Rolled, with Improved Atmospheric Corrosion Resistance1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.19on Steel Sheet and Strip.Current edition approved Oct. 1, 2008May 1, 20
13、14. Published October 2008June 2014. Originally approved in 1981. Last previous edition approved in 20022008 asA749 97 (2002).A0749/A749M 08. DOI: 10.1520/A0749_A0749M-08. 10.1520/A0749_A0749M-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at
14、serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous versi
15、on. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes secti
16、on appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1A682/A682MA684/A684M Specification for Steel, Strip, High-Carbon, Cold-Rolled, General Requirements ForCold-Rolled(Withdrawn 2009)A700 Practices for
17、 Packaging, Marking, and Loading Methods for Steel Products for Shipment (Withdrawn 2014)3A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsA941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and FerroalloysA1008/A1008M Specification for Steel, She
18、et, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-StrengthLow-Alloy with Improved Formability, Solution Hardened, and Bake HardenableA1018/A1018M Specification for Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled, Carbon, Commercial, Drawing,Structural, High-Strength Low-Al
19、loy, High-Strength Low-Alloy with Improved Formability, and Ultra-High StrengthE11 Specification for Woven Wire Test Sieve Cloth and Test SievesE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE290 Test Methods for Bend Testing of Material for Ductil
20、ity2.2 Military Standards:4MIL-STD-129 Marking for Shipment and Storage2.3 Federal Standards:4Fed. Std. No. 123 Marking for Shipments (Civil Agencies)Fed. Std. No. 183 Continuous Identification Marking of Iron and Steel Products3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 S
21、teel Types:3.1.2 carbon steelthe designation for steel when no minimum content is specified or required for aluminum, chromium,cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, or any element added to obtain a desiredalloying effect; when the specified minimum for coppe
22、r does not exceed 0.40 %; or when the maximum content specified for anyof the following elements does not exceed the percentages noted; manganese 1.65, silicon 0.60, or copper 0.60.DiscussionIn all carbon steels small quantities of certain residual elements unavoidably retained from raw materials ar
23、esometimes found which are not specified or required, such as copper, nickel, molybdenum, chromium, etc. These elements areconsidered as incidental and are not normally determined or reported.3.1.3 high-strength, low-alloy steela specific group of steels in which higher strength, and in some cases a
24、dditional resistanceto atmospheric corrosion, are obtained by moderate amounts of one or more alloying elements.3.1.1 Product Types:3.1.2 hot-rolled stripmanufactured by hot rolling billets or slabs to the required thickness. It may be produced single widthor by rolling multiple width and slitting t
25、o the desired width. 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, in. Thickness, in.Over Through Over Through. 312 0.044 0.203312 6 0.044 0.2036 12 0.044 0.230 exclWidth, mm Thi
26、ckness, mmWidth, mm Thickness, mmOver Through Over ThroughOver 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 available by size as follows:3 The last approved version of this historical standard is referenced on www.astm.or
27、g.4 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.A749/A749M 142Width, in. Thickness, in.Over Through From ThroughCoils and at any place on the strip when narrower than 1 in. The given toleran
28、cesdo not include crown and therefore the tolerances for crown as shown in Table 54 are in addition to tolerances in Table 32.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
29、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
30、Tolerance, Over Only, for Specified Minimum Thickness, in.Over Through Through 0.057 Over 0.057 to0.118, incl Over 0.118 to0.187, incl Over 0.187 to0.203, incl Over 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 0.012TABLE 3
31、Thickness Tolerances of Hot-Rolled StripA (Carbon and High-Strength, Low-Alloy Steel) Ordered to Minimum Thickness(Coils and Cut Lengths, Including Pickling)NOTE 1Micrometres used for measurement of thickness shall be constructed with either flat anvils having a minimum diameter of 0.188 in. orround
32、ed 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 Tolerance, Over Only, for Specified Minimum Thickness, in.Over Through Through 0.057 Over 0.057 to0.118, incl Over 0.118 to0.187, incl
33、 Over 0.187 to0.203, incl Over 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 0.012A Measurements for 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 tha
34、n 1 in. The given tolerancesdo not include crown and therefore the tolerances for crown as shown in Table 54 are in addition to tolerances in Table 43.A749/A749M 1459.1.2 The ends of plain hot-rolled mill-edge coils are irregular in shape and are referred to as uncropped ends. Where such endsare not
35、 acceptable, the purchasers order should so specify. Processed coils such as pickled or blast cleaned are supplied withsquare-cut ends.9.2 Oiling:9.2.1 Plain hot-rolled strip is customarily furnished not oiled. Oiling must be specified when required for hot-rolled strip.9.2.2 Hot-rolled pickled or d
36、escaled strip is customarily furnished oiled. If the pickled/descaled product is not to be oiled, itmust be so specified since the cleaned surface is prone to rusting.10. General Requirements for Delivery10.1 Products covered by this specification are produced to inch-pound or metric decimal thickne
37、ss only.10.2 Steel may be produced as ingot-cast or strand-cast. When different grades of strand-cast steel are sequentially cast,identification and separation of the transition material is required.11. Retests11.1 If any test specimen shows defective machining or develops flaws, it must be discarde
38、d and another specimen substituted.TABLE 54 Crown Tolerances of 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 point 38 in. from theedge by the following amounts:Specified Width, in. Crown Tolerance, O
39、ver Only, for SpecifiedMinimum Thickness, in.Over Through Through0.118Over 0.118to 0.187,inclOver 0.187to 0.230,excl. . . 312 0.002 0.002 0.001. . . 312 0.002 0.002 0.001312 6 0.003 0.002 0.002312 6 0.003 0.002 0.0026 12 0.004 0.003 0.003TABLE 6 Width Tolerances of Hot-Rolled Strip (Carbon and High-
40、Strength, Low-Alloy Steel)(Coils and Cut Lengths, Including Pickled)Specified Width,in.Width Tolerance, Over andUnder, in.Over ThroughMill Edgeand SquareEdge StripCut EdgeThrough0.109 in.Over0.109 in.Through0.230 excl. . . 2 132 0.008 0.0162 5 364 0.008 0.0165 10 116 0.010 0.01610 12 332 0.016 0.016
41、TABLE 5 Width Tolerances of Hot-Rolled Strip (Carbon and High-Strength, Low-Alloy Steel)(Coils and Cut Lengths, Including Pickled)Specified Width,in.Width Tolerance, Over andUnder, in.Over ThroughMill Edgeand SquareEdge StripCut EdgeThrough0.109 in.Over0.109 in.Through0.230 excl. . . 2 132 0.008 0.0
42、162 5 364 0.008 0.0165 10 116 0.010 0.01610 12 332 0.016 0.016A749/A749M 14611.2 If the percentage of elongation of any tension test specimen is less than that specified and any part of the fracture is morethan 34 in. 20 mm from the center of the gauge length of a 2-in. 50 mm specimen or is outside
43、the middle half of the gaugelength of an 8-in. 200 mm specimen, as indicated by scribe scratches marked on the specimen before testing, a retest is allowed.11.3 If a bend specimen fails, due to conditions of bending more severe than required by the specification, a retest is permittedeither on a dup
44、licate specimen or on a remaining portion of the failed specimen.12. Inspection12.1 When the purchasers order stipulates that inspection and test (except product analyses) for acceptance on the steel be madeprior to shipment from the mill, the manufacturer shall afford the purchasers inspector all r
45、easonable facilities to satisfy him thatthe steel is being produced and furnished in accordance with the specification. Mill inspection by the purchaser shall not interfereunnecessarily with the manufacturers operation.13. Rejection and Rehearing13.1 Unless otherwise specified, any rejection shall b
46、e reported to the manufacturer within a reasonable time after receipt ofmaterial by the purchaser.13.2 Material that is reported to be defective subsequent to the acceptance at the purchasers works shall be set aside, adequatelyprotected, and correctly identified. The manufacturer shall be notified
47、as soon as possible so that an investigation may be initiated.TABLE 76 Length Tolerances of Hot-Rolled Strip (Carbon and High-Strength Alloy)(Cut Lengths, Including Pickled)Specified Widths, in.Length Tolerances over Specified Length, ft for Widths Given, in. No Tolerance UnderTo 5 ft, incl Over 5 t
48、o 10 ft,incl Over 10 to 20 ft,incl Over 20 to 30 ft,incl Over 30 to 40 ft,inclOver 40 ft,inclTo 3, incl 14 “ 12 34 1 112To 3, incl 14 “ 12 34 1 112Over 3 to 6, incl 38 12 58 34 1 112Over 3 to 6, incl 38 12 58 34 1 112Over 6 to 12, incl 12 34 1 114 112 134TABLE 87 Camber TolerancesA of Hot-Rolled Str
49、ip(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 any 8-ft length.B Itis 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. i
