1、Designation: A 624/A 624M 03Standard Specification forTin Mill Products, Electrolytic Tin Plate, Single Reduced1This standard is issued under the fixed designation A 624/A 624M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the y
2、ear of last revision. 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. Scope*1.1 This specification covers si
3、ngle-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 with a trimmed edge
4、.1.2 This specification is applicable to orders in eitherinch-pound units (as A 624) which is supplied in nominalthicknesses from 0.0061 to 0.0149 in. or SI units as A 624Mwhich is supplied in nominal thicknesses from 0.155 to 0.378mm.1.3 The values stated in either inch-pound or SI units are tobe r
5、egarded 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 specification.1.4 This stan
6、dard 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 A
7、STM Standards:2A 623 Specification for Tin Mill Products, General Require-mentsA 623M Specification for Tin Mill Products, General Re-quirements (Metric)A 630 Test Methods for Determination of Tin CoatingWeights for Hot-Dip and Electrolytic Tin PlateA 754 Test Method for Coating Thickness by X-Ray F
8、luo-rescenceB 339 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:3.1.1 Name of product (single-reduced electrolytic tin plate)(Section 1),3.1
9、.2 Tin coating weight mass designation and marking, ifany (Section 4, Table 1, and Fig. 1 and Fig. 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 (Specification A 623 A 623M) (this mustbe consistent with the intended a
10、pplication),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 (Specification A 623 A 623M),3.1.10 Temper designation (Specification
11、 A 623 A 623M)(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 inside diameter is approxi-mately 16 in. if ordered as A 624 410
12、mm if ordered as A624M. Coils should be specified to a maximum coil weight ifordered as A 624 mass if ordered as A 624M, or maximumoutside diameter or both,3.1.14 Packaging,3.1.15 Special requirements where applicable, J = plate or K= plate, and3.1.16 ASTM specification designation and year of issue
13、.NOTE 1A typical ordering description for coils is as follows: 1250base boxes, single reduced, electrolytic tin plate, No. 20, DOS, L, T-5 CA,7C, 0.0088 in. thickness 3114 in. by coil, 16 in. inside diameter, 65 in.maximum outside diameter, 25 000 lbs maximum coil weight, for 300diameter sanitary op
14、en top ends in accordance with Specification A 624/A 624M - XX. 250 SITAS, single reduced electrolytic tin plate, 2.2/2.2,1This 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
15、 Products.Current edition approved Oct. 1, 2003. Published December 2003. Originallyapproved in 1968. Last previous edition approved in 1998 as A 624/A 624M - 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
16、of ASTMStandards volume information, refer to the standards 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.DOS, L, T-5, 7C, 0
17、.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 A 624/A 624M - XX.NOTE 2A typical ordering description for cut sizes is as follows: 500base boxes, single r
18、educed electrolytic tin plate, No. 25, DOS, MR,T-2BA, 7C, 0.0110 in. thickness, 3034 in. by 30716 in., for 307 diametergeneral line rings in accordance with Specification A 624/A 624M - XX.100 SITAS, single reduced electrolytic tin plate, 2.8/2.8, DOS, MR, T-2,7C, 0.28 mm thickness, 781 by 773 mm, f
19、or 83-mm diameter general linerings in accordance with Specification A 624/A 624M - XX.NOTE 3The production of coils does not afford the same opportunityfor inspection, grading, and sorting as does the production of cut sizes.Accordingly, appropriate processing and quality-control procedures arerequ
20、ired 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 with theirutilization are included.NOTE 4In inch-pound units, single reduced electrolytic tin plate
21、 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 from the specifiedlength and width dimensions and sheet count. In SI units, single-reducedelectrolytic
22、 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 thespecified length and width dimensions and sheet count. For calculatingmass, the density of steel
23、 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 1. Other combinations ofcoatings may be specified by agreement between the producerand the purchase
24、r.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 separated by a slash mark, for example,D50/25 D5.6/2.8. The first number will represent the coatingweight m
25、ass on the outside of the coil or the top surface of thecut sizes.4.1.3 In order to distinguish 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 i
26、s shownalong with the coating number to indicate the side of the plateto be marked.4.2 Sampling 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 ofe
27、lectrolytic tin plate, the following procedure shall be used:4.2.1.1 CoilsOne test strip shall 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 Fr
28、om one or two coil lots, each coil shall besampled. A minimum of three randomly selected test 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 fro
29、many one item of a specific shipment.4.2.2 Each test sheet shall be spot tested at a minimum ofthree 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 p
30、rocedure shall be used:4.2.2.1 All test spots are taken on a center line at rightangles to the 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 m
31、inimum of three test spots are taken theyshall be edge, center, and edge tests.4.2.2.5 The average 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
32、Tin Coating Weights MassesTypical methods for determination of tin coating weightsmasses are described in Test Methods A 630. An acceptablemethod for determining tin coating weight mass is the X-rayfluorescence method, performed in accordance with TestMethodA 754. In cases of dispute, Method B, Refe
33、ree Method,shall be used.4.5 Pig tin used in the production of tin plate shall be GradeA as shown in the latest revision of Specification B 339.TABLE 1 Electrolytic Tin Plate Coating Weight MassNOTE 1Listed below are commonly produced coating weightsmasses. By agreement between the producer and the
34、purchaser, othercombinations of the coatings may be specified and the appropriateminimum average test values will apply.Designation No.Nominal Tin CoatingWeight Mass each Sur-face, lb/base box g/m2Minimum AverageCoating Weight Masseach Surface TestValue, lb/base boxAg/m25 0.6/0.6B0.025/0.025 0.6/0.6
35、 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 0.23/0.23 5.2/5.2
36、75 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 7.8/2.5D 100/25 D 11.2/2.8 0.50/0.125 11.2/2.8 0.45/0.11 10.1/2.5D 100/50 D 11.2/5.6 0.50/0.25 11
37、.2/5.6 0.45/0.23 10.1/5.2D 135/25 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 end uses
38、.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).A 624/A 624M 0325. Surface Appearance and Finish5.1 Surface AppearanceSingle-reduced electrolytic tinplate is custo
39、marily produced with a melted coating (bright).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
40、):5.2.1.1 7BA smooth finish which may contain 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/
41、or Otherwise Textured Roll Finish-es (produced as either melted or unmelted coatings):5.2.2.1 5C A 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
42、Treatment6.1 Electrolytic tin plate as produced 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 may
43、cause 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 bypassing the strip through a chemical solution with or withoutFI
44、G. 1 Standard Heavy Side Marking System for Differential Electrolytic Tin PlateA 624/A 624M 033current. 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 o
45、n the surface. Unless otherwisespecified, 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.
46、1 The cathodic sodium dichromate treatment is themost widely used treatment, and provides a highly passivatedsurface against the formation of tin oxides. It has the followingattributes: (1) minimum tin oxide growth after prolongedstorage; (2) minimized discoloration during subsequent bakingrequired
47、for organic coatings and lithography; (3) minimizeddiscoloration due to soldering operation; and (4) provides someresistance to tin sulfide discoloration of certain sulfur-bearingfood products.FIG. 2 Standard Light Side Marking System for Differential Electrolytic Tin PlateA 624/A 624M 0346.2.1.2 Ca
48、thodic sodium dichromate-treated tin plate has anaim range of 350 to 650 g of chromium per square foot ofsurface. 4000 to 7000 g of chromium per square metre ofsurface.6.2.2 Sodium Dichromate Dip (SDCD/SDD) Treatment:6.2.2.1 The sodium dichromate dip treatment provides mod-erate passivation against
49、tin oxide formation.6.2.2.2 Sodium dichromate dip-treated tin plate has a maxi-mum of 200 g of chromium per square foot of surface. 2200g of chromium per square metre of surface.7. Oiling7.1 Electrolytic tin plate is furnished with an oil film appliedto both surfaces. The most commonly used oil films are dioctylsebacate (DOS) and acetyl tributyl citrate (ATBC). Other oilfilms may be used. Surface act
