1、Designation: A626/A626M 13A626/A626M 16Standard Specification forTin Mill Products, Electrolytic Tin Plate, Double Reduced1This standard is issued under the fixed designation A626/A626M; the number immediately following the designation indicates the yearof original adoption or, in the case of revisi
2、on, 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. Scope*1.1 This specificat
3、ion covers double-reduced electrolytic tin plate produced from low-carbon cold-reduced steel furnished incoils and cut sizes for use predominately in the manufacture of cans. It is furnished in commercially available tin coating weightsmasses and is normally supplied with a trimmed edge.1.2 This spe
4、cification is applicable to orders in either inch-pound units (as A626) which is supplied in thicknesses from 0.0050to 0.0118 in. or SI units as A626M which is supplied in thicknesses from 0.127 to 0.300 mm.1.3 The values stated in either inch-pound or SI units are to be regarded as standard. Within
5、 the text, the SI units are shownin brackets. The values stated in each system are not exact equivalents. Therefore, each system must be used independently of theother. Combining values from the two systems may result in nonconformance with this specification.1.4 This standard does not purport to ad
6、dress all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A623 Specifica
7、tion for Tin Mill Products, General RequirementsA623M Specification for Tin Mill Products, General Requirements MetricA630 Test Methods for Determination of Tin Coating Weights for Electrolytic Tin PlateA754/A754M Test Method for Coating Weight (Mass) of Metallic Coatings on Steel by X-Ray Fluoresce
8、nceB339 Specification for Pig Tin3. Ordering Information3.1 Orders for product under this specification shall include the following information, as required and applicable, to describeadequately the desired product:3.1.1 Name of product (double-reduced electrolytic tin plate) (Section 1),3.1.2 Tin c
9、oating weight mass designation, and marking, if any (Section 5, Table 1, and Fig 1 and 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 A623 A623M) (consistent with the intended application),3.1.7 Coil wid
10、th or cut size in increments of 116 in. or 1 mm,3.1.8 Due to the very distinct directional properties, rolling direction must be specified on cut sizes by underlining the slit(rolling width) dimension (Section 4) (consistent with the intended application),3.1.9 Steel type (Specification A623 A623M),
11、3.1.10 Mechanical requirement designation (Specification A623 A623M) (consistent with the intended application),3.1.11 Intended application,1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
12、 A01.20on Tin Mill Products.Current edition approved Oct. 1, 2013Dec. 1, 2016. Published October 2013December 2016. Originally approved in 1968. Last previous edition approved in 20082013as A626/A626M - 08A626/A626M1. -13. DOI: 10.1520/A0626_A0626M-13.10.1520/A0626_A0626M-16.2 For referencedASTM sta
13、ndards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an
14、ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as publish
15、ed by ASTM is to be considered the official document.*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 States13.1.12 Quantity in base boxes SITAs (see Note 4),3.1.13 On coils, sp
16、ecify minimum or range of acceptable inside diameters. The standard inside diameter is approximately 16in. if ordered to Specification A626 410 mm if ordered to Specification A626M. Coils should be specified to a maximum coilweight if ordered to Specification A626 mass if ordered to Specification A6
17、26M or maximum outside diameter, or both,3.1.14 Packaging,3.1.15 Special requirements, where applicable (J = plate or K = 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, D50/25,
18、melted, CDC, ATBC, 0.0066-in.thickness, 30 by coil, MR, DR-8 CA, for 307 by 401 welded can bodies in accordance with Specification A626/A626M - XX. 250 SITAs, double-reducedelectrolytic tin plate, D 5.6 2.8, melted, CDC, ATBC, 0.17-mm thickness, 760 by coil, MR, DR-8, for 99 by 105 mm welded can bod
19、ies to SpecificationA626/A626M - XX.NOTE 2A typical ordering description for cut sizes is as follows: 500 base boxes, single reduced electrolytic tin plate, No. 25, ATBC, MR, T-2 BA,7C, 0.0110 in. thickness, 30 34 in. by 30 716 in., for 307 diameter general line rings in accordance with Specificatio
20、n A626/A626M-XX. 100 SITAs, singlereduced electrolytic tin plate, 2.8/2.8, ATBC, MR, DR-8 CA, 7C, 0.28 mm thickness, 781 by 773 mm, for 99 by 105 mm welded can bodies toSpecification A626/A626M-XX.NOTE 3The production of coils does not afford the same opportunity for inspection, grading, and sorting
21、 as does the production of cut sizes.Accordingly, appropriate processing and quality control procedures are required by the purchaser to obtain optimum utilization of the material. Cut sizesare line inspected visually and mechanically during production. Sheets having surface imperfections that will
22、not interfere with their utilization areincluded.NOTE 4In inch-pound units, double-reduced electrolytic tin plate is supplied on an area basis expressed in base boxes. In coils, the number of baseboxes is computed from the measured length and the specified width. In cut sizes, the number of base box
23、es is computed from the specified length andwidth dimensions and sheet count. In SI units, double-reduced electrolytic tin plate is supplied on an area basis expressed in SITAs. In coils, the numberof SITAs is computed from the measured length and the specified width. In cut sizes, the number of SIT
24、As is computed from the specified length andwidth dimensions and sheet count. For calculating mass, the density of steel for tin mill products is 0.2836 lb/in.3 7850 kg/m3.4. Rolling Direction4.1 Double-reduced plate is stronger and less ductile than single reduced plate and has very distinct direct
25、ional properties. Therolling direction must be specified on cut sizes and will be indicated by underlining the slit (rolling width) dimension. To minimizethe flange-cracking hazard when the product is used for can bodies, the rolling direction must be around the circumference of thecan.5. Tin Coatin
26、g Weight Mass5.1 Class Designation and Marking:5.1.1 Electrolytic tin plate is commonly produced to the class designations shown in Table 1. Other combinations of coatingsmay be specified by agreement between the producer and the purchaser.TABLE 1 Electrolytic Tin Plate Coating Weight MassNOTE 1List
27、ed 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 eachSurface, lb/base box g/m2Mini
28、mum Average CoatingWeight Mass each Sur-face Test Value, lb/baseboxA g/m 25 0.6 0.6B 0.025/0.025 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 2.8/2.8 0.11/0.
29、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 2.8C 0.25/0.125 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.
30、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 0.50/0.25 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 5.3 and 5.4).BS
31、ome 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).A626/A626M 16
32、25.1.2 Differentially coated tin plate is a product having one surface more heavily tin coated than the opposite. The classdesignation is expressed by showing the two tin coating weights masses separated by a slash mark, for example, 50/25 D5.6/2.8. The first number will represent the coating weight
33、 mass on the outside of the coil or the top surface of the cut sizes.Other line marking conventions must be brought to the attention of the supplier at the time of order entry.5.1.3 In order to distinguish material having differential coatings, the face with the heavier coating is normally marked. B
34、yarrangement, a special marking can be supplied on the light-coated face (see Fig. 1 and Fig. 2). The letter D is shown along withthe coating number to indicate the side of the plate to be marked.5.2 Sampling for Tin Coating Weights Masses:5.2.1 When the purchaser wishes to make tests to ascertain c
35、ompliance with the requirements of this specification for tin coatingweight mass on a lot of any specific item of electrolytic tin plate, the following procedure shall be used:5.2.1.1 CoilsOne test strip shall be taken at random from a representative section of each coil across its width. A minimumo
36、f three test strips, each taken from different coils from any one item of a specific lot shall be selected.FIG. 1 Standard Heavy-Side Marking System for Differential Electrolytic Tin PlateA626/A626M 1635.2.1.2 From one or two coil lots, each coil should be sampled.Aminimum of three randomly selected
37、 test strips shall representthe lot.5.2.1.3 Cut SizesOne sheet shall be taken at random from each 50 packages or part thereof, with a minimum of three differentsample plates, each taken from different bundles from any one item of a specific shipment.5.2.2 Each test sheet shall be spot tested at a mi
38、nimum of three locations across the rolling direction of the sheet. Spot tests arecustomarily disks or squares 4 in.2 26 cm2 in area; other sizes may be used. In order to secure representative samples, thefollowing procedure shall be used:5.2.2.1 All test spots are taken on a center line at right an
39、gles to the rolling direction.FIG. 2 Standard Light-Side Marking System for Differential Electrolytic Tin PlateA626/A626M 1645.2.2.2 No test spots shall be closer than 1 in. 25 mm from the mill-trimmed edge of the test sheets.5.2.2.3 No test spots shall be closer than 2 in. 50 mm from one another.5.
40、2.2.4 If the minimum of three test spots are taken, they shall be edge, center, and edge tests.5.2.2.5 The average of all spot tests on all test strips or sheets represents the average coating weight mass test value.5.3 Coating weight mass test values shall conform to the values shown in Table 1.5.4
41、 Determination of Tin Coating Weights MassesTypical methods for determination of tin coating weights masses aredescribed in Test Methods A630. An acceptable method for determining tin coating weight mass is the X-ray fluorescencemethod, performed in accordance with Test Method A754/A754M. In case of
42、 dispute, Method B, Referee Method, shall be used.5.5 Pig tin used in the production of tin plate shall be Grade A for the production of tin plate or ultra thin pure tin as shownin the latest edition of Specification B339.6. Surface Appearance and Finish6.1 Surface AppearanceDouble-reduced electroly
43、tic tin plate is customarily produced with a melted coating (bright).Unmelted coating (matte) is also available.6.2 Base Metal FinishDouble-reduced electrolytic tin plate is produced with ground roll finishes.6.2.1 7CA smooth finish with grit lines. The surface roughness will range between 6 and 25
44、in. Ra 0.152 to 0.635 m Ra.7. Chemical Treatment7.1 Electrolytic tin plate as produced without a surface chemical treatment is subject to tin oxide growth that is manifested bysurface discoloration during storage and subsequent baking operations and may adversely affect application and adhesion ofor
45、ganic coatings and lithography, and may cause poor solderability. A chemical treatment is therefore applied in most cases afterthe tin coating has been deposited and immediately preceding the oiling to control tin oxide formation and growth. The chemicaltreatment is applied by passing the strip thro
46、ugh a chemical solution with or without current. Chemical treatments on electrolytictin plate are applied commensurate with each suppliers method and equipment, however, one of the controlling factors is theamount of combined chromium present on the surface. Unless otherwise specified, the surface c
47、hemical treatment will be left tothe discretion of the tin plate producer.7.2 In order of decreasing surface passivation, the commonly 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 the most w
48、idely used treatment, and provides a highly passivated surfaceagainst the formation of tin oxides. It has the following attributes: (1) minimum tin oxide growth after prolonged storage; (2)minimized discoloration during subsequent baking required for organic coatings and lithography; (3) minimized d
49、iscoloration dueto soldering operation; and (4) provides some resistance to tin sulfide discoloration of certain sulfur-bearing food products.7.2.1.2 Cathodic sodium dichromate-treated tin plate has an aim range from 350 to 650 g of chromium per square foot ofsurface 4 000 to 7 000 g of chromium per square metre of surface.7.2.2 Sodium Dichromate Dip (SDCD/SDD) Treatment:7.2.2.1 The sodi
