1、Designation: A 626/A 626M 03 (Reapproved 2008)1Standard Specification forTin Mill Products, Electrolytic Tin Plate, Double Reduced1This standard is issued under the fixed designation A 626/A 626M; the number immediately following the designation indicates the yearof original adoption or, in the case
2、 of revision, 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 Department of Defense.1NOTEEditorially change
3、d 4.1 and 5.1.2 in October 2008.1. Scope*1.1 This specification covers double-reduced electrolytic tinplate produced from low-carbon cold-reduced steel furnishedin coils and cut sizes for use predominately in the manufactureof cans. It is furnished in commercially available tin coatingweights masses
4、 and is normally supplied with a trimmededge.1.2 This specification is applicable to orders in eitherinch-pound units (as A 626) which is supplied in thicknessesfrom 0.0050 to 0.0118 in. or SI units as A 626M which issupplied in thicknesses from 0.127 to 0.300 mm.1.3 The values stated in either inch
5、-pound or SI units 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 thi
6、s specification.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 and health practices and determine the applica-bility of regulatory limitations prior to use
7、.2. Referenced Documents2.1 ASTM Standards:2A 623 Specification for Tin Mill Products, General Require-mentsA 623M Specification for Tin Mill Products, General Re-quirements MetricA 630 Test Methods for Determination of Tin CoatingWeights for Electrolytic Tin PlateA 754/A 754M Test Method for Coatin
8、g Weight (Mass) ofMetallic Coatings on Steel by X-Ray FluorescenceB 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
9、(double-reduced electrolytic tinplate) (Section 1),3.1.2 Tin coating weight mass designation, and marking, ifany (Section 5, Table 1, and Fig. 1 and Fig. 2),3.1.3 Surface appearance and finish (Section 6),3.1.4 Chemical treatment (Section 7),3.1.5 Oiling (Section 8),3.1.6 Thickness (Specification A
10、623 A 623M) (consistentwith the intended application),3.1.7 Coil width or cut size in increments of116 in. or 1 mm,3.1.8 Due to the very distinct directional properties, rollingdirection must be specified on cut sizes by underlining the slit(rolling width) dimension (Section 4) (consistent with thei
11、ntended application),3.1.9 Steel type (Specification A 623 A 623M),3.1.10 Mechanical requirement designation (SpecificationA 623 A 623M) (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 o
12、f acceptableinside diameters. The standard inside diameter is approxi-mately 16 in. if ordered to Specification A 626 410 mm ifordered to Specification A 626M. Coils should be specified toa maximum coil weight if ordered to SpecificationA 626 massif ordered to Specification A 626M or maximum outside
13、diameter, or both,3.1.14 Packaging,3.1.15 Special requirements, where applicable (J = plate orK = plate), and3.1.16 ASTM specification number and year of issue.NOTE 1A typical ordering description is as follows: 1000 base boxes,double-reduced electrolytic tin plate, D 50/25, melted, CDC, DOS,1This s
14、pecification 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 Oct. 1, 2008. Published October 2008. Originallyapproved in 1968. Last previous edition approv
15、ed in 2003 as A 626/A 626M - 03.2For 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 standards Document Summary page onthe ASTM website.1*A Summary of Changes sectio
16、n appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.0.0066-in. thickness, 30 by coil, MR, DR-8 CA, for 307 by 401 weldedcan bodies in accordance with Specification A 626/A 626M - XX. 250SITAS, double-
17、reduced electrolytic tin plate, D 5.6/2.8, melted, CDC,DOS, 0.17-mm thickness, 760 by coil, MR, DR-8, for 99 by 105 mmwelded can bodies to Specification A 626/A 626M - XX.NOTE 2A typical ordering description for cut sizes is as follows: 500base boxes, single reduced electrolytic tin plate, No. 25, D
18、OS, MR, T-2BA, 7C, 0.0110 in. thickness, 3034 in. by 30716 in., for 307 diametergeneral line rings in accordance with Specification A 626/A 626M-XX.100 SITAS, single reduced electrolytic tin plate, 2.8/2.8, DOS, MR, DR-8CA, 7C, 0.28 mm thickness, 781 by 773 mm, for 99 by 105 mm weldedcan bodies to S
19、pecification A 626/A626M-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 arerequired by the purchaser to obtain optimum utilization of the
20、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, double-reduced electrolytic tin plate issupplied on an area basis expressed in base boxes. In co
21、ils, 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, double-reducedelectrolytic tin plate is supplied on an area basis expressed in SITA
22、S. 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 for tin mill products is 0.2836 lb/in.37850kg/m3.4. Roll
23、ing Direction4.1 Double-reduced plate is stronger and less ductile thansingle reduced plate and has very distinct directional proper-ties. The rolling direction must be specified on cut sizes andwill be indicated by underlining the slit (rolling width) dimen-sion. To minimize the flange-cracking haz
24、ard when the productis used for can bodies, the rolling direction must be around thecircumference of the can.5. Tin Coating Weight Mass5.1 Class Designation and Marking:5.1.1 Electrolytic tin plate is commonly produced to theclass designations shown in Table 1. Other combinations ofcoatings may be s
25、pecified by agreement between the producerand the purchaser.5.1.2 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, 50/25D 5.
26、6/2.8. The first number will represent the coating weightmass on the outside of the coil or the top surface of the cutsizes. Other line marking conventions must be brought to theattention of the supplier at the time of order entry.5.1.3 In order to distinguish material having differentialcoatings, t
27、he 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.5.2 Sampling for Tin Coating Weights Masses:5.2.1 Wh
28、en 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:5.2.1.1 CoilsOne test strip shall be taken at random froma representative
29、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.5.2.1.2 From one or two coil lots, each coil should besampled. A minimum of three randomly selected test stripsshall represent the lot.5.2.1.3 Cu
30、t 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.5.2.2 Each test sheet shall be spot tested at a minimum ofthree locations across the rolling direc
31、tion 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:5.2.2.1 All test spots are taken on a center line at rightangles to the rolling direction.5.2.2.2 No test spots
32、shall be closer than 1 in. 25 mm fromthe mill-trimmed edge of the test sheets.5.2.2.3 No test spots shall be closer than 2 in. 50 mm fromone another.5.2.2.4 If the minimum of three test spots are taken, theyshall be edge, center, and edge tests.5.2.2.5 The average of all spot tests on all test strip
33、s orsheets represents the average coating weight mass test value.5.3 Coating weight mass test values shall conform to thevalues shown in Table 1.5.4 Determination of Tin Coating Weights MassesTypical methods for determination of tin coating weightsmasses are described in Test Methods A 630. An accep
34、tableTABLE 1 Electrolytic Tin Plate Coating Weight MassNOTE 1Listed as follows are commonly produced coating weightsmasses. By agreement between the producer and the purchaser, othercombinations of the coatings may be specified and the appropriateminimum average test values will apply.Designation No
35、.Nominal Tin CoatingWeight Mass each Sur-face, lb/base box g/m2Minimum Average CoatingWeight Mass each Sur-face Test Value, lb/baseboxAg/m25 0.6/0.6B0.025/0.025 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
36、 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 5.2/5.275 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.
37、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 11.2/5.6 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 8
38、0 % of the minimum averagecoating weight mass (see 5.3 and 5.4).BSome No. 5 melted applications may require revised minimum and maximumlevels for fully alloyed end uses.CThe letter D on differentially coated tin plate indicates the coated surface to bemarked. For example, the examples indicate that
39、the heavy-coated side is marked(see 5.1.2 and 5.1.3).A 626/A 626M 03 (2008)12method for determining tin coating weight mass is the X-rayfluorescence method, performed in accordance with TestMethod A 754. In case of dispute, Method B, Referee Method,shall be used.5.5 Pig tin used in the production of
40、 tin plate shall be GradeA as shown in the latest edition of Specification B 339.6. Surface Appearance and Finish6.1 Surface AppearanceDouble-reduced electrolytic tinplate is customarily produced with a melted coating (bright).Unmelted coating (matte) is also available.6.2 Base Metal FinishDouble-re
41、duced electrolytic tinplate is produced with ground roll finishes.6.2.1 7CA smooth finish with grit lines. The surfaceroughness will range between 6 and 25 in. Ra 0.152 to 0.635m Ra.7. Chemical Treatment7.1 Electrolytic tin plate as produced without a surfacechemical treatment is subject to tin oxid
42、e 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 maycause poor solderability. A chemical treatment is thereforeapplied in most cases after the tin coating has
43、 been depositedand immediately preceding the oiling to control tin oxideFIG. 1 Standard Heavy-Side Marking System for Differential Electrolytic Tin PlateA 626/A 626M 03 (2008)13formation and growth. The chemical treatment is applied bypassing the strip through a chemical solution with or withoutcurr
44、ent. 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 otherwisespecified, the surface chemical treatment will be left to thediscret
45、ion of the tin plate producer.7.2 In order of decreasing surface passivation, the com-monly used chemical treatments for tin plate are as follows:7.2.1 Cathodic Sodium Dichromate (CDC) Treatment:7.2.1.1 The cathodic sodium dichromate treatment is themost widely used treatment, and provides a highly
46、passivatedsurface against the formation of tin oxides. It has the followingattributes: (1) minimum tin oxide growth after prolongedstorage; (2) minimized discoloration during subsequent bakingFIG. 2 Standard Light-Side Marking System for Differential Electrolytic Tin PlateA 626/A 626M 03 (2008)14req
47、uired for organic coatings and lithography; (3) minimizeddiscoloration due to soldering operation; and (4) provides someresistance to tin sulfide discoloration of certain sulfur-bearingfood products.7.2.1.2 Cathodic sodium dichromate-treated tin plate has anaim range from 350 to 650 g of chromium pe
48、r square foot ofsurface 4 000 to 7 000 g of chromium per square metre ofsurface.7.2.2 Sodium Dichromate Dip (SDCD/SDD) Treatment:7.2.2.1 The sodium dichromate dip treatment provides mod-erate passivation against tin oxide formation.7.2.2.2 Sodium dichromate dip-treated tin plate has a maxi-mum of 20
49、0 g of chromium per square foot of surface 2200g of chromium per square metre of surface.8. Oiling8.1 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 active agents such as glycerolmonooleate (GMO) may be incorporated into the oil film forapp
