1、Designation: A 684/A 684M 06Standard Specification forSteel, Strip, High-Carbon, Cold-Rolled1This standard is issued under the fixed designation A 684/A 684M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) 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. Scope1.1 This specification covers cold-rolled, high-carb
3、on strip.It is furnished in the following types as specified:1.1.1 Soft spheroidized annealed high-carbon steel is in-tended for applications requiring maximum cold forming. It isnormally produced to give the lowest maximum Rockwellhardness for each grade.1.1.2 Soft annealed high-carbon steel is int
4、ended for appli-cations requiring moderate cold forming. It is produced to amaximum Rockwell hardness.1.1.3 Intermediate hardness high-carbon steel is intendedfor applications where cold forming is slight or a stiff, springyproduct is needed, or both. It is produced to specified Rockwellhardness ran
5、ges, 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 hardness require-ments, which vary with grade, microstructure and gage. Fullhard can be produced with either a pearlitic or sphero
6、idizedmicrostructure or a mixture of both. The minimum hardnessshould be established between the consumer and the producer.1.2 This specification is applicable for orders in eitherinch-pound units or SI units.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately a
7、s standard. The values 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.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions
8、for Mechanical Testingof Steel ProductsA 682/A 682M Specification for Steel, Strip, High-Carbon,Cold-Rolled, General Requirements ForE3 Guide for Preparation of Metallographic Specimens3. Terminology3.1 Number 1 or matte (dull) finishfinish without luster,produced by rolling on rolls roughened by me
9、chanical orchemical means. This finish is especially suitable for lacquer orpaint adhesion, and is beneficial in aiding drawing operationsby reducing the contact friction between the die and the strip.3.2 Number 2 (regular bright) finishfinish produced byrolling on rolls having a moderately smooth f
10、inish. It is lesssuitable that No. 1 (matte) finish for cold forming and may beapplicable for certain types of plating.3.3 spheroidizingthe heating and cooling of the strip incontrolled conditions (annealing) to produce a spheroidal orglobular form of carbide microconstituent.3.4 stretcher strainsel
11、ongated markings that appear onthe surface of the strip when dead soft (fully annealed) materialis deformed beyond its yield point (see 5.2).4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 ASTM designation and date of issue,4.1.2 N
12、ame, 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 (indicate and specify),4.1.10 Conditi
13、ons (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), and4.1.13 Special requirements (if required).NOTE 1A typical ordering description is as follows: ASTM A 684dated Cold Rolled, High-Carbon Soft, St
14、rip, 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 or1This 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
15、 Sheet and Strip.Current edition approved Oct. 1, 2006. Published October 2006. Originallyapproved in 1973. Last previous edition approved in 2002 as A 684/A 684M 86(2002).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For An
16、nual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.“ASTM A 684 dated Cold Rolled, High-Carbon, Soft, Strip,Spheroidized 1064,
17、 0.6 mm by 200 mm by coil (400 mm ID by 7500 mmOD max), No. 3 Edge, No. 2 Finish, Oiled, Bare Skid.”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 obta
18、ined by eitherrolling the strip after final annealing 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, and minimize stretcherstrains if required by th
19、e purchaser.6. Chemical Requirements6.1 Cast or Heat AnalysisThe heat or cast analysis shallconform to that specified in Specification A 682/A 682M forthe steel grade ordered; or to such other limits as may bespecified using the standard ranges in Specification A 682/A 682M.7. Metallurgical Structur
20、e7.1 Pearlite is the normal structure of cold rolled high-carbon strip unless it has had an intermediate anneal.7.2 Annealed is mostly a spheroidized structure, but maycontain some vestiges of pearlite.7.3 Spheroidize annealed is essentially free of pearlite.7.4 At least one specimen shall be taken
21、from each lot (seeSpecification A 682/A 682M) for microexamination.7.4.1 The specimens shall be prepared for microscopicexamination in accordance with Guide E3.8. Mechanical Requirements8.1 Hardness:8.1.1 Spheroidized Annealed and Annealed TypesWhenfurnished spheroidized annealed or annealed, the ha
22、rdness ofthe strip shall not exceed the maximum values specified in Fig.1 and Fig. 2 for the applicable carbon range and type.8.1.2 Intermediate Hardness TypeWhen furnished as in-termediate hardness, the hardness of the strip shall conform tothe range specified on the purchase order. The maximumhard
23、ness limit and the corresponding minimum shall be speci-fied by the purchaser. If the maximum temper is underRockwell B 100 (15T93 or 30T82), that scale should be usedexclusively. If the minimum temper is over Rockwell C 20(15N69.5 or 30N41.5), that scale should be used exclusively.For accuracy in t
24、esting, the hardness scales should not overlap.On either hardness scale, a range of ten points arithmeticdifference is required. Refer to Table 1 for appropriate scaletesting requirements.8.1.3 Full hard is specified to a minimum hardness value.Refer to Table 1 for appropriate scale testing requirem
25、ents.8.1.4 At least one specimen shall be taken from each lot (seeSpecification A 682/A 682M).8.1.5 The sample shall be tested in accordance with TestMethods and Definitions A 370.FIG. 1 Approximate Relationship Between Carbon Designations and the Maximum Hardness Limit of Soft Type Annealed Cold Ro
26、lledHigh Carbon Steel StripA 684/A 684M 0628.2 Bend Test:8.2.1 The steel strip produced as spheroidized, or theannealed type shall meet the cold bend requirement in Table 2.Any visible cracking on the tension side of the bend portionshall be cause for rejection.8.2.2 At least one specimen shall be t
27、aken from each lot (seeSpecification A 682 or A 682M).8.2.3 The specimen shall be the full thickness and shall betaken transverse to the rolling direction as described in TestMethods and Definitions A 370. The edges of the bend testspecimens shall be rounded and free of burrs; filing ormachining is
28、permissible.9. Finish and Edges9.1 SurfaceThe strip shall be furnished with a No. 2Regular Bright or No. 1 Matte (Dull) finish, as specified.9.2 OilingThe strip shall be furnished oiled or dry, asspecified.9.3 EdgesThe strip shall be furnished with a No. 1 roundor Square, No. 2 Mill, No. 3 Square Sl
29、it, No. 4 ApproximatelyRound, No. 5 Approximately Square Burr Free, or No. 6Approximately Square Edge, as specified.10. General Requirements10.1 Material furnished under this specification shall con-form to the applicable requirements for the current edition ofeither Specification A 682/A 682M.FIG.
30、2 Approximate Relationship Between Carbon Designations and the Maximum Hardness Limit of Spheroidized Annealed ColdRolled High Carbon Steel StripTABLE 1 Rockwell Hardness Testing Ranges for Cold-RolledHigh-Carbon Steel StripRockwell “B” and “T” Scales Rockwell “C” and “N” ScalesThickness Scale Thick
31、ness 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.under 0.6 mm15NTABLE 2 Cold Bending RequirementsA,Bfor Spheroidized,Annealed, and Soft-Annealed Cold-Rolled Carbon Steel S
32、tripType Degree ofBendInsideRadius toThicknessRelation of BendTest Specimen toRolling DirectionAnnealedSpheroidized1801803t2ttransverseCtransverseCAUp to 0.100 in. 2.5 mm, incl, thickness maximum. When bend radius forthickness is over 0.100 in. 2.5 mm the producer should be consulted. These ratiosap
33、ply 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 operations a more liberal bend radiusmay be required and should be based on prior experience or consultation with thesteel producer, o
34、r both.CIf finished strip width prohibits taking a transverse bend test specimen, alongitudinal specimen may be substituted, except the bend radius shall be reducedby 1t.A 684/A 684M 063ASTM International takes no position respecting the validity of any patent rights asserted in connection with any
35、item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical c
36、ommittee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at
37、a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Dr
38、ive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).A 684/A 684M 064
