1、Designation: A684/A684M 10Standard 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 Department of Defense.1. Scope*1.1 This specification covers cold-rolled, high-carbon s
3、tripin coils or cut lengths. Strip is classified as product that is0.3000 in. 7.6 mm or less in thickness and over12 to 231516in. 12.5 to 600 mm in width, inclusive. Strip toleranceproducts may be available in widths wider than 231516 in. (600mm) by agreement between purchaser and supplier; however,
4、such products are technically classified as cold-rolled sheet.The maximum of the specified carbon range is over 0.25 to1.35 %, 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 forming
5、. 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 applicati
6、ons 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 Rockwell ha
7、rdness require-ments, which vary with grade, microstructure and gauge. Fullhard can be produced with either a pearlitic or spheroidizedmicrostructure or a mixture of both. The minimum hardnessshould be established between the consumer and the producer.1.2 This specification is applicable for orders
8、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 syst
9、ems 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 theright
10、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 shall b
11、efurnished 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. Conform
12、ance 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), C
13、old-RolledA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA568/A568M Specification for Steel, Sheet, Carbon, Struc-tural, and High-Strength, Low-Alloy, Hot-Rolled andCold-Rolled, General Requirements forA700 Practices for Packaging, Marking, and Loading Meth-ods for Steel Pr
14、oducts for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA941 Terminology Relating to Steel, Stainless Steel, Re-lated Alloys, and FerroalloysE3 Guide for Preparation of Metallographic SpecimensE29 Practice for Using Significant Digits in Test Data toD
15、etermine 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 SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved May 1, 2010. Published June 2010. Originall
16、yapproved in 1973. Last previous edition approved in 2008 as A684/A684M 08.DOI: 10.1520/A0684_A0684M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard
17、s 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, United States.E112 Test Methods for Determining Average Grain SizeE527 Practice for Number
18、ing Metals and Alloys in theUnified Numbering System (UNS)2.2 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
19、 1086 Recommended 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
20、the same cast or heat, 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
21、of the strip when 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 designat
22、ion and date of issue,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, etc.),4.1.9 Finish (indicat
23、e and specify),4.1.10 Conditions (specify whether material is oiled or dry),4.1.11 Package (bare coils, skid, etc.),4.1.12 Cast or heat (formerly ladle) analysis report (ifrequired),4.1.12.1 Silicon requirement specified (Type 1, Type 2, orother as agreed between purchaser and producer). If nospecif
24、ication is supplied, then Type 1 (see Table 1, Footnote B)will be supplied.4.1.13 Special 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 A684d
25、ated _ Cold Rolled, High-Carbon Soft, Strip, Spheroidized 1064,0.042 in. by 6 in. by coil (16 in. ID by 40 in. OD max), No. 5 Edge, No.2 Finish, Oiled, Bare Skid or “ASTM A684 dated _ Cold Rolled,High-Carbon, Soft, Strip, Spheroidized 1064, 0.6 mm by 200 mm by coil(400 mm ID by 7500 mm OD max), No.
26、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 annealing or by v
27、arying 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 thepurchaser.3Available f
28、rom Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, 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) Analysi
29、s Chemical Composition, %UNS DesignationASteel Grade Carbon Manganese Phosphorus, max Sulfur, max SiliconG10300 1030 0.28 to 0.34 0.60 to 0.90 0.030 0.035BG10350 1035 0.32 to 0.38 0.60 to 0.90 0.030 0.035BG10400 1040 0.37 to 0.44 0.60 to 0.90 0.030 0.035BG10450 1045 0.43 to 0.50 0.60 to 0.90 0.030 0
30、.035BG10500 1050 0.48 to 0.55 0.60 to 0.90 0.030 0.035BG10550 1055 0.50 to 0.60 0.60 to 0.90 0.030 0.035BG10600 1060 0.55 to 0.65 0.60 to 0.90 0.030 0.035BG10640 1064 0.60 to 0.70 0.50 to 0.80 0.030 0.035BG10650 1065 0.60 to 0.70 0.60 to 0.90 0.030 0.035BG10700 1070 0.65 to 0.75 0.60 to 0.90 0.030 0
31、.035BG10740 1074 0.70 to 0.80 0.50 to 0.80 0.030 0.035BG10800 1080 0.75 to 0.88 0.60 to 0.90 0.030 0.035BG10850 1085 0.80 to 0.93 0.70 to 1.00 0.030 0.035BG10860 1086 0.80 to 0.93 0.30 to 0.50 0.030 0.035BG10950 1095 0.90 to 1.03 0.30 to 0.50 0.030 0.035BANew designation established in accordance wi
32、th Practice E527 and SAE J 1086.BSilicon composition as one of the following:Type 1: 0.15 0.30Type 2: 0.10 maxOr other silicon ranges are permissible when agreed upon by purchaser and producer.A684/A684M 1026. Chemical Requirements6.1 Limits:6.1.1 When carbon steel strip is specified to chemicalcomp
33、osition, 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 maximum limit,6.1.1.2 By a minimum limit, or6.1.1.3 By minimum and maximum limits, termed the“range.”
34、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 specification are shown in Table 3and may be used. Table 4 shows requirements for additionalelem
35、ents.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 analysis.6.2 Heat (Formerly Ladle) Analysis:6.2.1 An analysis of each heat of steel shall be made by
36、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 purchaser or to his represen-tative. Each of the elements listed in Tables 3 and 4 andadditional
37、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 reported as 0.02 %.When the amount of vanadium, columbium, or titanium is lessthan 0.008 %, the an
38、alysis may be reported as 0.008 %. Thereported heat analysis shall conform to the chemical composi-tion requirements of the appropriate grade in Table 3, if used,the additional elements in Table 4, and the limits of any otherelements agreed upon by the purchaser and supplier.6.3 Product AnalysisProd
39、uct 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 composition iswithin specified limits for each element as listed in Table 1including applicable toleranc
40、e for product analysis, or todetermine variations in compositions within a cast or heat.Table 5 lists additional chemical composition requirements.The results of analyses taken from different pieces within aheat may differ from each other and from the cast analysis. Thechemical composition thus dete
41、rmined shall not vary from thelimits specified by more than the amounts shown in Table 6.6.4 Methods of AnalysisTest Methods, Practices, andTerminology A751 shall be used for referee purposes.7. Metallurgical Structure7.1 Grain Size:7.1.1 Unless otherwise specified, the steel strip shall bemanufactu
42、red to a fine grain (austenitic and ferritic) practice.7.1.2 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 maximumpermissible depth of complete plus partial decarburiza
43、tion 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. 0.279mm thick shall show no complete decarburization.7.3 Annealed is mostly a spheroidized structure, but maycontain some vestiges of pearlite.TABLE 2 Rockwell Hardness Testin
44、g Ranges for Cold-RolledHigh-Carbon Steel StripRockwell “B” and “T” Scales Rockwell “C” and “N” ScalesThickness Scale Thickness ScaleOver 0.030 in.over 0.8 mmB Over 0.040 in.over 1.0 mmC0.020 to 0.030 in.0.5 to 0.8 mm30T 0.025 to 0.040 in.0.6 to 1.0 mm30NUnder 0.020 in.under 0.5 mm15T Under 0.025 in
45、.under 0.6 mm15NTABLE 3 Cold Bending RequirementsA,Bfor Spheroidized,Annealed, and Soft-Annealed Cold-Rolled Carbon Steel StripTypeDegree ofBendInsideRadius toThicknessRelation of BendTest Specimen toRolling DirectionAnnealed 180 3t transverseCSpheroidized 180 2t transverseCAUp to 0.100 in. 2.5 mm,
46、incl, thickness maximum. When bend radius forthickness is over 0.100 in. 2.5 mm the producer should be consulted. These ratiosapply to bending performance of the test specimen.BThese bend tests apply to the bending performance of test specimens only.Where material is to be bent in fabricating operat
47、ions a more liberal bend radiusmay be required and should be based on prior experience or consultation with thesteel producer, or both.CIf finished strip width prohibits taking a transverse bend test specimen, alongitudinal specimen may be substituted, except the bend radius shall be reducedby 1 t.T
48、ABLE 4 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 0.40 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
49、, 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 0.07over 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 the carbon ranges shownabove.A
