1、Designation: A624/A624M 13 (Reapproved 2018)Standard Specification forTin Mill Products, Electrolytic Tin Plate, Single Reduced1This standard is issued under the fixed designation A624/A624M; the number immediately following the designation indicates the yearof original adoption or, in the case of r
2、evision, 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 Defense.1. Scope1.1 This specif
3、ication covers single-reduced electrolytic tinplate produced from low-carbon cold-reduced steel furnishedin coils and cut sizes for use in the manufacture of cans,closures, crowns, and other products. It is furnished in com-mercially available tin coating weights masses, and is nor-mally supplied wi
4、th a trimmed edge.1.2 This specification is applicable to orders in eitherinch-pound units (as A624) which is supplied in nominalthicknesses from 0.0061 to 0.0149 in. or SI units as A624Mwhich is supplied in nominal thicknesses from 0.155 to 0.378mm.1.3 The values stated in either inch-pound or SI u
5、nits are tobe regarded as standard. Within the text, the SI units are shownin brackets. The values stated in each system are not exactequivalents. Therefore, each system must be used indepen-dently of the other. Combining values from the two systemsmay result in nonconformance with this specificatio
6、n.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to u
7、se.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers
8、 to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A623 Specification for Tin Mill Products, General Require-mentsA623M Specification for Tin Mill Products, General Re-quirements MetricA630 Test Methods for Determination of Tin CoatingWeights for Electrolytic Tin PlateA754/A754M Te
9、st Method for Coating Weight (Mass) ofMetallic Coatings on Steel by X-Ray FluorescenceB339 Specification for Pig Tin3. Ordering Information3.1 Orders for product under this specification shall includethe following information, as required and applicable, todescribe adequately the desired product:3.1
10、.1 Name of product (single-reduced electrolytic tin plate)(Section 1),3.1.2 Tin coating weight mass designation and marking, ifany (Section 4, Table 1, and Figs 1 and 2),3.1.3 Surface appearance and finish (Section 5),3.1.4 Chemical treatment (Section 6),3.1.5 Oiling (Section 7),3.1.6 Thickness (Spe
11、cification A623 A623M) (this mustbe consistent with the intended application),3.1.7 Coil width or cut size in increments of116 in. or 1 mm,3.1.8 Where required, rolling direction will be specified oncut sizes and will be indicated by underlining the slit (rollingwidth) dimension,3.1.9 Steel type (Sp
12、ecification A623 A623M),3.1.10 Temper designation (Specification A623 A623M)(this must be consistent with the intended application),3.1.11 Intended application,3.1.12 Quantity in base boxes (SITAs) (see Note 4),3.1.13 On coils, specify minimum or range of acceptableinside diameters. The standard ins
13、ide diameter is approxi-mately 16 in. if ordered as A624 410 mm if ordered asA624M. Coils should be specified to a maximum coil weightif ordered as A624 mass if ordered as A624M, or maximumoutside diameter or both,3.1.14 Packaging,3.1.15 Special requirements where applicable, J = plate or K= plate,
14、and3.1.16 ASTM specification designation and year of issue.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.20 on Tin Mill Products.Current edition approved Sept. 1, 2018. Published Sep
15、tember 2018. Originallyapproved in 1968. Last previous edition approved in 2013 as A624/A624M 13.DOI: 10.1520/A0624_A0624M-13R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
16、on, 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, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordanc
17、e with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1NOTE 1A typical ordering description
18、 for coils is as follows: 1250base boxes, single reduced, electrolytic tin plate, No. 20, ATBC, L, T-5CA, 7C, 0.0088 in. thickness 3114 in. by coil, 16 in. inside diameter, 65in. maximum outside diameter, 25 000 lbs maximum coil weight, for 300diameter sanitary open top ends in accordance with Speci
19、fication A624/A624M - XX. 250 SITAs, single reduced electrolytic tin plate, 2.2/2.2,ATBC, L, T-5, 7C, 0.22 mm thickness, 794 mm by coil, 410 mm insidediameter, 1650 mm maximum outside diameter, 11 500 kg maximum coilmass, for 73-mm diameter sanitary open top ends in accordance withSpecification A624
20、/A624M - XX.NOTE 2A typical ordering description for cut sizes is as follows: 500base boxes, single reduced electrolytic tin plate, No. 25, ATBC, MR,T-2BA, 7C, 0.0110 in. thickness, 3034 in. by 30716 in., for 307 diametergeneral line rings in accordance with Specification A624/A624M - XX.100 SITAs,
21、single reduced electrolytic tin plate, 2.8/2.8, ATBC, MR, T-2,7C, 0.28 mm thickness, 781 by 773 mm, for 83-mm diameter general linerings in accordance with Specification A624/A624M - XX.NOTE 3The production of coils does not afford the same opportunityfor inspection, grading, and sorting as does the
22、 production of cut sizes.Accordingly, appropriate processing and quality-control procedures arerequired by the purchaser to obtain optimum utilization of the material.Cut sizes are line inspected visually and mechanically during production.Sheets having surface imperfections that will not interfere
23、with theirutilization are included.NOTE 4In inch-pound units, single reduced electrolytic tin plate issupplied on an area basis expressed in base boxes. In coils the number ofbase boxes is computed from the measured length and the specified width.In cut sizes the number of base boxes is computed fro
24、m the specifiedlength and width dimensions and sheet count. In SI units, single-reducedelectrolytic tin plate is supplied on an area basis expressed in SITAs. Incoils, the number of SITAs is computed from the measured length and thespecified width. In cut sizes, the number of SITAs is computed from
25、thespecified length and width dimensions and sheet count. For calculatingmass, the density of steel for tin mill products is 0.2836 lb/in.37850kg/m3.4. Tin Coating Weight Mass4.1 Class Designations and Marking:4.1.1 Electrolytic tin plate is commonly produced to theclass designations shown in Table
26、1. Other combinations ofcoatings may be specified by agreement between the producerand the purchaser.4.1.2 Differentially coated tin plate is a product having onesurface more heavily tin coated than the opposite. The classdesignation is expressed by showing the two tin coatingweights masses separate
27、d by a slash mark, for example,D50/25 D5.6/2.8. The first number will represent the coatingweight mass on the outside of the coil or the top surface of thecut sizes. Other line marking conventions must be brought tothe attention of the supplier at the time of order entry.4.1.3 In order to distinguis
28、h material having differentialcoatings, the face with the heavier coating is normally marked.By arrangement, a special marking can be supplied on thelight-coated face (see Fig. 1 and Fig. 2). The letter D is shownalong with the coating number to indicate the side of the plateto be marked.4.2 Samplin
29、g for Tin Coating Weights Masses:4.2.1 When the purchaser wishes to make tests to ascertaincompliance with the requirements of this specification for tincoating weight mass on a lot of any specific item ofelectrolytic tin plate, the following procedure shall be used:4.2.1.1 CoilsOne test strip shall
30、 be taken at random froma representative section of each coil across its width. Aminimum of three test strips, each taken from different coilsfrom any one item of a specific lot shall be selected.4.2.1.2 From one or two coil lots, each coil shall besampled. A minimum of three randomly selected test
31、stripsshall represent the lot.4.2.1.3 Cut SizesOne sheet shall be taken at random fromeach 50 packages, or part thereof, with a minimum of threedifferent sample plates, each taken from different bundles fromany one item of a specific shipment.4.2.2 Each test sheet shall be spot tested at a minimum o
32、fthree locations across the rolling direction of the sheet. Spottests are customarily disks or squares 4 in.226 cm2 in area;other sizes may be used. In order to secure representativesamples, the following procedure shall be used:4.2.2.1 All test spots are taken on a center line at rightangles to the
33、 rolling direction.4.2.2.2 No test spots shall be closer than 1 in. 25 mm fromthe mill-trimmed edge of the test sheets.4.2.2.3 No test spots shall be closer than 2 in. 50 mm fromone another.4.2.2.4 If the minimum of three test spots are taken theyshall be edge, center, and edge tests.4.2.2.5 The ave
34、rage of all spot tests on all test strips orsheets represents the average coating weight mass test value.4.3 Coating weight mass test values shall conform to thevalues shown in Table 1.4.4 Determination of Tin Coating Weights MassesTypical methods for determination of tin coating weightsmasses are d
35、escribed in Test Methods A630. An acceptablemethod for determining tin coating weight mass is the X-rayfluorescence method, performed in accordance with TestTABLE 1 Electrolytic Tin Plate Coating Weight MassNOTE 1Listed below are commonly produced coating weightsmasses. By agreement between the prod
36、ucer and the purchaser, othercombinations of the coatings may be specified and the appropriateminimum average test values will apply.Designation No.Nominal Tin CoatingWeight Mass eachSurface, lb/base box g/m2Minimum AverageCoating Weight Masseach Surface TestValue, lb/base boxAg/m25 0.6 0.6B0.025/0.
37、025 0.6 0.6 0.02/0.02 0.5 0.510 1.1 1.1 0.05/0.05 1.1/1.1 0.04/0.04 0.9/0.915 1.7 1.7 0.075/0.075 1.7/1.7 0.06/0.06 1.4/1.420 2.2 2.2 0.10/0.10 2.2/2.2 0.08/0.08 1.8/1.825 2.8 2.8 0.125/0.125 2.8/2.8 0.11/0.11 2.5/2.535 3.9 3.9 0.175/0.175 3.9/3.9 0.16/0.16 3.6/3.650 5.6 5.6 0.25/0.25 5.6/5.6 0.23/0
38、.23 5.2/5.275 8.4 8.4 0.375/0.375 8.4/8.4 0.35/0.35 7.8/7.8100 11.2/11.2 0.50/0.50 11.2/11.2 0.45/0.45 10.1/10.1D 50/25 D 5.6 2.8C0.25/0.125 5.6/2.8 0.23/0.11 5.2/2.5D 75/25 D 8.4 2.8 0.375/0.125 8.4/2.8 0.35/0.11 7.8/2.5D100/25 D 11.2 2.8 0.50/0.125 11.2/2.8 0.45/0.11 10.1/2.5D100/50 D 11.2 5.6 0.5
39、0/0.25 11.2/5.6 0.45/0.23 10.1/5.2D135/25 D 15.2 2.8 0.675/0.125 15.2/2.8 0.62/0.11 14.0/2.5AThe minimum spot value shall be not less than 80 % of the minimum averagecoating weight mass (see 4.3 and 4.4).BSome No. 5 melted applications may require revised minimum and maximumlevels for fully alloyed
40、end uses.CThe letter D on differentially coated tin plate indicates the coated surface to bemarked. For example, the examples indicate that the heavy-coated side is marked(see 4.1.2 and 4.1.3).A624/A624M 13 (2018)2Method A754/A754M. In cases of dispute, Method B, RefereeMethod, shall be used.4.5 Pig
41、 tin used in the production of tin plate shall be GradeA for the production of tin plate or ultra pure tin as shown inthe latest revision of Specification B339.5. Surface Appearance and Finish5.1 Surface AppearanceSingle-reduced electrolytic tinplate is customarily produced with a melted coating (br
42、ight).Unmelted coating (matte) is also available.5.2 Base Metal FinishSingle-reduced electrolytic tin plateis produced with ground roll finishes and shot-blasted rollfinishes as follows:5.2.1 Ground Roll Finishes (produced as either melted orunmelted coatings):5.2.1.1 7BA smooth finish which may con
43、tain fine gritlines. This finish is specified for special applications.5.2.1.2 7CA smooth finish with grit lines. The surfaceroughness will range between 10 and 25 in. Ra 0.254 to0.635 m Ra. This is the standard finish for tin mill products.5.2.2 Blasted and/or Otherwise Textured Roll Finishes (pro-
44、duced as either melted or unmelted coatings):5.2.2.1 5CA shot blasted finish (SBF) for general appli-cations. The surface roughness will range from 30 to 60 in. Ra0.760 to 1.52 m Ra.5.2.2.2 5DA shot blasted finish (SBF) for special appli-cations.6. Chemical Treatment6.1 Electrolytic tin plate as pro
45、duced without a surfacechemical treatment is subject to tin oxide growth that ismanifested by surface discoloration during storage and subse-quent baking operations and may adversely affect applicationand adhesion of organic coatings and lithography, and mayFIG. 1 Standard Heavy Side Marking System
46、for Differential Electrolytic Tin PlateA624/A624M 13 (2018)3cause poor solderability. A chemical treatment is thereforeapplied in most cases after the tin coating has been depositedand immediately preceding the oiling, to control tin oxideformation and growth. The chemical treatment is applied bypas
47、sing the strip through a chemical solution with or withoutcurrent. Chemical treatments on electrolytic tin plate areapplied commensurate with each suppliers method and equip-ment; however, one of the controlling factors is the amount ofcombined chromium present on the surface. Unless otherwisespecif
48、ied, the surface chemical treatment will be left to thediscretion of the tin plate producer.6.2 In order of decreasing surface passivation, the com-monly used chemical treatments for tin plate are as follows:6.2.1 Cathodic Sodium Dichromate (CDC) Treatment:6.2.1.1 The cathodic sodium dichromate trea
49、tment is themost widely used treatment, and provides a highly passivatedsurface against the formation of tin oxides. It has the followingFIG. 2 Standard Light Side Marking System for Differential Electrolytic Tin PlateA624/A624M 13 (2018)4attributes: (1) minimum tin oxide growth after prolongedstorage; (2) minimized discoloration during subsequent bakingrequired for organic coatings and l
