1、Designation: A684/A684M 15Standard Specification forSteel, Strip, High-Carbon, Cold-Rolled1This standard is issued under the fixed designation A684/A684M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A
2、 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 Defense.1. Scope*1.1 This specification covers cold-rolled, high-car
3、bon stripin coils or cut lengths. Strip is classified as product that is0.3000 in. 7.6 mm or less in thickness and over12 to231516 in. 12.5 to 600 mm in width, inclusive. Strip toleranceproducts may be available in widths wider than 231516 in.(600 mm) by agreement between purchaser and supplier;howe
4、ver, such products are technically classified as cold-rolledsheet. The maximum of the specified carbon range is over 0.25to 1.35 %, inclusive. It is furnished in the following types asspecified:1.1.1 Soft spheroidized annealed high-carbon steel is in-tended for applications requiring maximum cold fo
5、rming. It isnormally produced to give the lowest maximum Rockwellhardness for each grade.1.1.2 Soft annealed high-carbon steel is intended for appli-cations requiring moderate cold forming. It is produced to amaximum Rockwell hardness.1.1.3 Intermediate hardness high-carbon steel is intendedfor appl
6、ications where cold forming is slight or a stiff, springyproduct is needed, or both. It is produced to specified Rockwellhardness ranges, the maximum being higher than obtained forthe annealed type.1.1.4 Full hard high-carbon steel is intended for flat appli-cations. It is produced to minimum Rockwe
7、ll hardnessrequirements, which vary with grade, microstructure andgauge. Full hard can be produced with either a pearlitic orspheroidized microstructure or a mixture of both. The mini-mum hardness should be established between the consumerand the producer.1.2 This specification is applicable for ord
8、ers in eitherinch-pound units or SI units.1.3 The values stated in either 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
9、systems may result in non-conformancewith the standard.1.4 The tolerances in this specification are different thanthose in Specification A568/A568M and Specification A109/A109M.1.5 For the purpose of determining conformance with thisspecification, values shall be rounded to the nearest unit in theri
10、ght hand place of figures used in expressing the limitingvalues in accordance with the rounding method of PracticeE29.1.6 This specification is expressed in both inch-pound unitsand SI units. However, unless the order specifies the applicable“M” specification designation (SI units), the material sha
11、ll befurnished to inch-pound units. The metric portions of the tablesherein list permissible variations in dimensions and mass (seeNote 1) in SI (metric) units. The values listed are not exactconversions of the values listed in the inch-pound tables butinstead are rounded or rationalized values. Con
12、formance to SItolerances 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.2. Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel, Strip, Carbon (0.25Maximum Percent
13、), Cold-RolledA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA568/A568M Specification for Steel, Sheet, Carbon,Structural, and High-Strength, Low-Alloy, Hot-Rolled andCold-Rolled, General Requirements forA700 Guide for Packaging, Marking, and Loading Methodsfor Steel Produc
14、ts for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA941 Terminology Relating to Steel, Stainless Steel, Related1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsib
15、ility of SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved Nov. 1, 2015. Published November 2015. Originallyapproved in 1973. Last previous edition approved in 2014 as A684/A684M 14.DOI: 10.1520/A0684_A0684M-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org,
16、orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700,
17、West Conshohocken, PA 19428-2959. United States1Alloys, and FerroalloysA1073/A1073M Practice for Using Hand Micrometers toMeasure the Thickness of Nonmetallic and Metallic-Coated Steel SheetE3 Guide for Preparation of Metallographic SpecimensE29 Practice for Using Significant Digits in Test Data toD
18、etermine Conformance with Specifications2.2 Federal Standards:Fed. Std. No. 123 Marking for Shipments (Civil Agencies)3Fed. Std. No. 183 Continuous Identification Marking of Ironand Steel Products32.3 Military Standard:MIL-STD-129 Marking for Shipping and Storage32.4 SAE Standard:J 1086 Recommended
19、Practice for Numbering Metals andAlloys (UNS)43. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 burrmetal displaced beyond the plane of the surfaceby slitting or shearing.3.1.2 lotquantity of material of the same type, size, andfinish produced at one time from the same cast or h
20、eat, and heattreated in the same heat-treatment cycle.3.1.3 spheroidizingthe heating and cooling of the strip incontrolled conditions (annealing) to produce a spheroidal orglobular form of carbide microconstituent.3.1.4 stretcher strainselongated markings that appear onthe surface of the strip when
21、dead soft (fully annealed) materialis deformed beyond its yield point (see 5.2).3.2 Refer to Terminology A941 for additional terms used inthis standard.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 ASTM designation and date of is
22、sue.4.1.2 Name, type, and steel grade number.4.1.3 Hardness (if intermediate or restricted hardness isspecified).4.1.4 Decarburization (if required).4.1.5 Application.4.1.6 Dimensions.4.1.7 Coil size requirements.4.1.8 Edge (indicate No. 1 round, square, and so forth).4.1.9 Finish (indicate and spec
23、ify).4.1.10 Conditions (specify whether material is oiled or dry).4.1.11 Package (bare coils, skid, and so forth).4.1.12 Cast or heat (formerly ladle) analysis report (ifrequired).4.1.12.1 The additional chemical composition requirements(heat analysis) for copper, nickel, chromium, and molybdenumsha
24、ll be specified as Limits L or Limits H. If no limits arespecified, Limits L will be provided.4.1.12.2 Silicon requirement specified (Type 1, Type 2, orother as agreed between purchaser and producer). If nospecification is supplied, then Type 1 (see Table 1, Footnote A)will be supplied.4.1.13 Specia
25、l requirements (if required).4.2 Products covered by this specification are produced todecimal thickness only, and decimal thickness tolerances apply.NOTE 2A typical ordering description is as follows: ASTM A684dated _ Cold Rolled, High-Carbon Soft, Strip, Spheroidized 1064,0.042 in. by 6 in. by coi
26、l (16 in. ID by 40 in. OD max), No. 5 Edge, No. 2Finish, Oiled, Bare Skid or “ASTM A684 dated _ Cold Rolled,High-Carbon, Soft, Strip, Spheroidized 1064, 0.6 mm by 200 mm by coil3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5
27、098, http:/www.dodssp.daps.mil.4Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.TABLE 1 Heat (Formerly Ladle) Analysis Chemical Composition, %SteelDesignationNo.Carbon Manganese Phosphorus, max Sulfur, max Silicon1030 0.28 to 0.
28、34 0.60 to 0.90 0.030 0.035A1035 0.32 to 0.38 0.60 to 0.90 0.030 0.035A1040 0.37 to 0.44 0.60 to 0.90 0.030 0.035A1045 0.43 to 0.50 0.60 to 0.90 0.030 0.035A1050 0.48 to 0.55 0.60 to 0.90 0.030 0.035A1055 0.50 to 0.60 0.60 to 0.90 0.030 0.035A1060 0.55 to 0.65 0.60 to 0.90 0.030 0.035A1064B0.59 to 0
29、.70 0.50 to 0.80 0.030 0.035A1065 0.60 to 0.70 0.60 to 0.90 0.030 0.035A1070 0.65 to 0.75 0.60 to 0.90 0.030 0.035A1074 0.70 to 0.80 0.50 to 0.80 0.030 0.035A1075 0.70 to 0.80 0.40 to 0.70 0.030 0.035A1080 0.75 to 0.88 0.60 to 0.90 0.030 0.035A1085 0.80 to 0.93 0.70 to 1.00 0.030 0.035A1086 0.80 to
30、0.93 0.30 to 0.50 0.030 0.035A1095 0.90 to 1.03 0.30 to 0.50 0.030 0.035AASilicon composition as one of the following:Type 1: 0.150.30Type 2: 0.10 maxOr other silicon ranges are permissible when agreed upon by purchaser and producer.B1064 is not an SAE steel grade.A684/A684M 152(400 mm ID by 7500 mm
31、 OD max), No. 3 Edge, No. 2 Finish, Oiled, BareSkid.”5. Manufacture5.1 Condition:5.1.1 The strip shall be furnished cold rolled spheroidizedannealed, soft annealed, intermediate hardness, or full hard, asspecified.5.1.2 Intermediate hardness may be obtained by eitherrolling the strip after final ann
32、ealing or by varying theannealing treatment, or both.5.2 Pinch PassSpheroidized annealed and annealed ma-terial may be pinch rolled after the final anneal to improveflatness, uniformly oil, modify surface, obtain proper mechani-cal properties, and minimize stretcher strains if required by thepurchas
33、er.6. Chemical Requirements6.1 Limits:6.1.1 When carbon steel strip is specified to chemicalcomposition, the compositions are commonly prepared usingthe ranges and limits shown in Table 2. The elements compris-ing the desired chemical composition are specified in one ofthree ways:6.1.1.1 By a maximu
34、m limit,6.1.1.2 By a minimum limit, or6.1.1.3 By minimum and maximum limits, termed the“range.” By common usage, the range is the arithmeticaldifference between the two limits (for example, 0.60 to 0.71 is0.11 range).6.1.2 Steel grade numbers indicating chemical compositioncommonly produced to this
35、specification are shown in Table 1and may be used. Table 3 shows requirements for additionalelements.6.1.3 Additional elements may be present. Limits on suchelements are by agreement between purchaser and supplier.6.1.3.1 Any additional elements specified shall be includedin the report of heat analy
36、sis.6.2 Heat (Formerly Ladle) Analysis:6.2.1 An analysis of each heat of steel shall be made by themanufacturer to determine the percentage of elements specifiedor restricted by the applicable specification.6.2.2 When requested, heat analysis for elements listed orrequired shall be reported to the p
37、urchaser or to his represen-tative. Each of the elements listed in Tables 1 and 3 andadditional elements agreed upon by the purchaser, and thesupplier shall be included in the report of heat analysis. Whenthe amount of copper, nickel, chromium, or molybdenum isless than 0.02 %, the analysis may be r
38、eported as 0.02 %.When the amount of vanadium, columbium, or titanium is lessthan 0.008 %, the analysis may be reported as 0.008 %. Thereported heat analysis shall conform to the chemical composi-tion requirements of the appropriate grade in Table 1, if used,the additional elements in Table 3, and t
39、he limits of any otherelements agreed upon by the purchaser and supplier.6.3 Product AnalysisProduct analysis is the chemicalanalysis of the semi-finished product form. The strip may besubjected to product analysis by the purchaser either for thepurpose of verifying that the ordered chemical composi
40、tion iswithin specified limits for each element as listed in Table 1,including applicable tolerance for product analysis, or todetermine variations in compositions within a cast or heat. Theresults of analyses taken from different pieces within a heatmay differ from each other and from the cast anal
41、ysis. Thechemical composition thus determined shall not vary from thelimits specified by more than the amounts shown in Table 4.6.4 Methods of AnalysisTest Methods, Practices, andTerminology A751 shall be used for referee purposes.7. Metallurgical Structure7.1 Grain Size:7.1.1 Unless otherwise speci
42、fied, the steel strip shall bemanufactured to a fine grain (austenitic and ferritic) practice.TABLE 2 Heat (Formerly Ladle) Analysis Limits and RangesElementStandard Chemical Limitsand Ranges, Limit or Maxof Specified RangeRange, %CarbonAover 0.25 to 0.30, incl 0.06over 0.30 to 0.40, incl 0.07over 0
43、.40 to 0.60, incl 0.08over 0.60 to 0.80, incl 0.11over 0.80 to 1.35, incl 0.14Manganese to 0.50, incl 0.20over 0.50 to 1.15, incl 0.30over 1.15 to 1.65, incl 0.35Phosphorous to 0.08, incl 0.03over 0.08 to 0.15, incl 0.05Sulfur to 0.08, incl 0.03over 0.08 to 0.15, incl 0.05over 0.15 to 0.23, incl 0.0
44、7over 0.23 to 0.33, incl 0.10Silicon to 0.20, incl 0.10over 0.20 to 0.30, incl 0.15over 0.30 to 0.60, incl 0.30AThe carbon ranges shown in the column headed “Range” apply when thespecified maximum limit for manganese does not exceed 1.00 %. When themaximum manganese limit exceeds 1.00 %, add 0.01 to
45、 the carbon ranges shownabove.TABLE 3 Additional Chemical Composition RequirementsHeatAnalysisElement CompositionWeight %AluminumA.VanadiumA.ColumbiumA.TitaniumA.LimitsLHCopper, maxB0.30 0.50Nickel, maxB0.30 0.30Chromium, maxB, C0.25 0.30Molybdenum, maxB0.10 0.16AWhere an ellipsis (. . .) appears in
46、 this table, there is no specified limit, but theanalysis shall be reported.BThe sum of copper, nickel, chromium, and molybdenum shall not exceed 0.80 %on heat analysis. When one or more of these elements is specified, the sum doesnot apply, in which case only the individual limits on the remaining
47、elements willapply.CFor antigraphitization, the maximum for chromium shall be 1.40 %.A684/A684M 1537.1.2 Pearlite is the normal structure of cold rolled high-carbon strip unless it has had an intermediate anneal.7.2 Decarburization:7.2.1 When specified, the steel strip shall have a maximumpermissibl
48、e depth of complete plus partial decarburization of0.001 in. 0.025 mm or 1.5 % of the thickness of the strip,whichever is greater, except that strip less than 0.011 in.0.279 mm thick shall show no complete decarburization.7.3 Annealed is mostly a spheroidized structure, but maycontain some vestiges
49、of pearlite.7.4 Spheroidized annealed is essentially free of pearlite.7.5 At least one specimen shall be taken from each lot formicroexamination.7.5.1 The specimens shall be prepared for microscopicexamination in accordance with Guide E3.8. Mechanical Requirements8.1 Unless otherwise specified in the applicable productspecification, test specimens must be prepared in accordancewith Test Methods and Definitions A370.8.2 Mechanical tests shall be conducted in accordance withTest Methods and Definitions A370.8.3 Hardness:8.3.1 Spheroidized Annealed
