1、Designation: A 626/A 626M 03Standard 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 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 do
3、uble-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 and is normally supplied with a trimmededge.1.2 This specification is ap
4、plicable 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-pound or SI units are tobe regarded as standard. Within the text, the SI
5、 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 standard does not purport to address all of thes
6、afety 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 ASTM Standards:2A 623 Specification for Tin M
7、ill Products, General Require-mentsA 623M Specification for Tin Mill Products, General Re-quirements MetricA 630 Test Methods for Determination of Tin CoatingWeights for Hot-Dip and Electrolytic Tin PlateA 754 Test Method for Coating Thickness by X-Ray Fluo-rescenceB 339 Specification for Pig Tin3.
8、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 (double-reduced electrolytic tinplate) (Section 1),3.1.2 Tin coating weight mass designation, and ma
9、rking, 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 623 A 623M) (consistentwith the intended application),3.1.7 Coil width or cut size in increments of1
10、16 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 theintended application),3.1.9 Steel type (Specification A 623 A 623M),3.1.10 Mechanical requirement des
11、ignation (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 of acceptableinside diameters. The standard inside diameter is approxi-mately 16 in. if ordered to Sp
12、ecification A 626 410 mm ifordered to Specification A 626M. Coils should be specified toa maximum coil weight if ordered to Specification A 626 massif ordered to Specification A 626M or maximum outsidediameter, or both,3.1.14 Packaging,3.1.15 Special requirements, where applicable (J = plate orK = p
13、late), 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,0.0066-in. thickness, 30 by coil, MR, DR-8 CA, for 307 by 401 weldedcan bodies in accordance with Specific
14、ation A 626/A 626M - XX. 250SITAS, double-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
15、 reduced electrolytic tin plate, No. 25, DOS, MR, T-21This 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 October 1, 2003. Published Decembe
16、r 2003. Originallyapproved in 1968. Last previous edition approved in 1998 as A 626/A 626M - 98.2For 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 Docume
17、nt 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.BA, 7C, 0.0110 in. thickness, 3034 in. by 30716 in., for 307 diametergeneral line ri
18、ngs 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 Specification A 626/A626M-XX.NOTE 3The production of coils does not afford the same opportunityf
19、or 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 material.Cut sizes are line inspected visually and mechanically during production.Sheets having
20、 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 coils, the number ofbase boxes is computed from the measured length and the specified width.In cu
21、t 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 SITAS. Incoils, the number of SITAS is computed from the measured length and thespecified width. In
22、 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. Rolling Direction4.1 Double-reduced plate is relatively brittle and has verydistinct directional pr
23、operties. The rolling direction must bespecified on cut sizes and will be indicated by underlining theslit (rolling width) dimension. To minimize the flange-crackinghazard when the product is used for can bodies, the rollingdirection must be around the circumference of the can.5. Tin Coating Weight
24、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 specified by agreement between the producerand the purchaser.5.1.2 Differentially coated tin plate is a product having onesurface mo
25、re 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 5.6/2.8. The first number will represent the coating weightmass on the outside of the coil or the top surface of the cutsizes.5.1.3 I
26、n 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 is shownalong with the coating number to indicate the side of the plateto
27、be marked.5.2 Sampling for Tin Coating Weights Masses:5.2.1 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:5.2.1.1 Coil
28、sOne 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.5.2.1.2 From one or two coil lots, each coil should besampled. A minimum of three r
29、andomly selected test stripsshall represent the lot.5.2.1.3 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.5.2.2 Each test sheet shall be spot
30、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 procedure shall be used:5.2.2.1 All test spots are taken on a center line
31、at rightangles to the rolling direction.5.2.2.2 No test spots 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
32、 tests.5.2.2.5 The average of all spot tests on all test strips 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 coati
33、ng 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 TestMethod A 754. In case of dispute, Method B, Referee Method,shall be used.TABLE 1 Electrolytic Tin Plate Coating Weight M
34、assNOTE 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.Nominal Tin CoatingWeight Mass each Sur-face, lb/ba
35、se 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 2.2/2.2 0.08/0.08 1.8/1.825 2.8/2.8 0.125/0.125 2.8
36、/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 5.6/2.8 0.23/0.11 5.2/2.5D 75/25 D 8.4/2.8 0.375/0.125
37、 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 80 % of the minimum averagecoating weight mass (see 5
38、.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 the heavy-coated side is marked(see 5.1.2 and 5.1.3)
39、.A 626/A 626M 0325.5 Pig tin used in the production of 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 (m
40、atte) is also available.6.2 Base Metal FinishDouble-reduced 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 with
41、out 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 maycause poor solderability. A chemical treatment is th
42、ereforeapplied 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 withoutFIG. 1 Standard Heavy-Side Marking System for Different
43、ial Electrolytic Tin PlateA 626/A 626M 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 on the surface. Unless otherwisespecified, the surface
44、 chemical treatment will be left to thediscretion 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
45、 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 PlateA 626/A 626M 034attributes: (1) minimum tin oxide growth after prolongedstorage; (2) minimized dis
46、coloration during subsequent bakingrequired 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
47、range from 350 to 650 g of chromium per 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-
48、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.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 cit
49、rate (ATBC). Other oilfilms may be used. Surface active agents such as glycerolmonooleate (GMO) may be incorporated into the oil film forapplication on tin plate.8.2 Unless indicated by the purchaser the specific oilingtreatment will be left to the discretion of the tin-plate producer.8.3 Weight Mass of Oil FilmThe weight mass of oilfilm as applied by the supplier of tin plate normally rangesfrom appr
