ASTM A624/A624M-22

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it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: A624/A624M − 13 (Reapproved 2018) A624/A624M − 22
Standard Specification for
Tin Mill Products, Electrolytic Tin Plate, Single Reduced
This standard is issued under the fixed designation A624/A624M; the number immediately following the designation indicates the year
of original adoption or, in the case 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 U.S. Department of Defense.
1. Scope Scope*
1.1 This specification covers single-reduced electrolytic tin plate produced from low-carbon cold-reduced steel furnished in coils
and cut sizes for use in the manufacture of cans, closures, crowns, and other products. It is furnished in commercially available
tin coating weights [masses], and is normally supplied with a trimmed edge.
1.2 This specification is applicable to orders in either inch-pound units (as A624) which is supplied in nominal thicknesses from
0.0061 to 0.0149 in. or SI units [as A624M] which is supplied in nominal thicknesses from 0.155 to 0.378 mm.
1.3 Units—The values stated in either inch-pound or SI units or inch-pound units are to be regarded as standard. Within the text,
the SI units are shown in brackets. separately as standard. The values stated in each system are not exact equivalents. Therefore,
each system mustnecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other. Combiningother, and values from the two systems may result in nonconformance with this
specification. shall not be combined.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A623 Specification for Tin Mill Products, General Requirements
A623M Specification for Tin Mill Products, General Requirements [Metric]
A630 Test Methods for Determination of Tin Coating Weights for Electrolytic Tin Plate
A754/A754M Test Method for Coating Weight [Mass] of Metallic Coatings on Steel by X-Ray Fluorescence
B339 Specification for Pig Tin
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.20
on Tin Mill Products.
Current edition approved Sept. 1, 2018March 1, 2022. Published September 2018March 2022. Originally approved in 1968. Last previous edition approved in 20132018
as A624/A624M – 13.A624/A624M – 13(2018). DOI: 10.1520/A0624_A0624M-13R18.10.1520/A0624_A0624M-22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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A624/A624M − 22
3. Ordering Information
3.1 Orders for product under this specification shall include the following information, as required and applicable, to describe
adequately the desired product:
3.1.1 Name of product (single-reduced electrolytic tin plate) (Section 1),
3.1.2 Tin coating weight [mass] designation and marking, if any (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 (Specification A623 [A623M]) (this must be consistent with the intended application),
3.1.7 Coil width or cut size in increments of ⁄16 in. or 1 mm,
3.1.8 Where required, rolling direction will be specified on cut sizes and will be indicated by underlining the slit (rolling width)
dimension,
3.1.9 Steel type (Specification 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 acceptable inside diameters. The standard inside diameter is approximately 16 in.
16 in. if ordered as A624 [410 mm [410 mm if ordered as A624M]. Coils should be specified to a maximum coil weight if ordered
as A624 [mass if ordered as A624M], or maximum outside diameter or both,
3.1.14 Packaging,
3.1.15 Special requirements where applicable, J = plate or K = plate, and
3.1.16 ASTM specification designation and year of issue.
NOTE 1—A typical ordering description for coils is as follows: 1250 base boxes, single reduced, electrolytic tin plate, No. 20, ATBC, L, T-5 CA, 7C,
0.0088 in. 0.0088 in. thickness 31 ⁄4 in. in. by coil, 16 in. 16 in. inside diameter, 65 in. 65 in. maximum outside diameter, 25 000 lbs 25 000 lbs maximum
coil weight, for 300 diameter sanitary open top ends in accordance with Specification 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 794 mm by coil, 410 mm 410 mm inside diameter, 1650 mm 1650 mm maximum outside
diameter, 11 500 kg 11 500 kg maximum coil mass, for 73-mm73 mm diameter sanitary open top ends in accordance with Specification A624/
A624M - XX.]
NOTE 2—A typical ordering description for cut sizes is as follows: 500 base boxes, single reduced electrolytic tin plate, No. 25, ATBC, MR, T-2BA, 7C,
3 7
0.0110 in. 0.0110 in. thickness, 30 ⁄4 in. in. by 30 ⁄16 in., in., for 307 diameter general line rings in accordance with Specification A624/A624M - XX.
[100 SITAs, single reduced electrolytic tin plate, 2.8/2.8, ATBC, MR, T-2, 7C, 0.28 mm 0.28 mm thickness, 781 by 773 mm, 773 mm, for 83-mm83 mm
diameter general line rings in accordance with Specification A624/A624M - XX.]
NOTE 3—The production of coils does not afford the same opportunity for inspection, grading, and sorting 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 sizes are line
inspected visually and mechanically during production. Sheets having surface imperfections that will not interfere with their utilization are included.
NOTE 4—In inch-pound units, single reduced electrolytic tin plate is supplied on an area basis expressed in base boxes. In coils the number of base boxes
is computed from the measured length and the specified width. In cut sizes the number of base boxes is computed from the specified length and width
dimensions and sheet count. [In SI units, single-reduced electrolytic tin plate is supplied on an area basis expressed in SITAs. In coils, the number of
SITAs is computed from the measured length and the specified width. In cut sizes, the number of SITAs is computed from the specified length and width
3 3
dimensions and sheet count]. For calculating mass, the density of steel for tin mill products is 0.2836 0.2836 lb lb/in.⁄in. [7850 [7850 kg kg/m⁄m ].
A624/A624M − 22
4. Tin Coating Weight [Mass]
4.1 Class Designations and Marking:
4.1.1 Electrolytic tin plate is commonly produced to the class designations shown in Table 1. Other combinations of coatings may
be specified by agreement between the producer and the purchaser.
4.1.2 Differentially coated tin plate is a product having one surface more heavily tin coated than the opposite. The class
designation is expressed by showing the two tin coating weights [masses] separated by a slash mark, for example, D50/25
[D5.6/2.8]. The first number will represent the coating weight [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.
4.1.3 In order to distinguish material having differential coatings, the face with the heavier coating is normally marked. By
arrangement, a special marking can be supplied on the light-coated face (see Fig. 1 and Fig. 2). The letter D is shown along with
the coating number to indicate the side of the plate to be marked.
4.2 Sampling for Tin Coating Weights [Masses]:
4.2.1 When the purchaser wishes to make tests to ascertain compliance with the requirements of this specification for tin coating
weight [mass] on a lot of any specific item of electrolytic tin plate, the following procedure shall be used:
4.2.1.1 Coils—One test strip shall be taken at random from a representative section of each coil across its width. A minimum of
three test strips, each taken from different coils from any one item of a specific lot shall be selected.
4.2.1.2 From one or two coil lots, each coil shall be sampled. A minimum of three randomly selected test strips shall represent
the lot.
4.2.1.3 Cut Sizes—One sheet shall be taken at random from each 50 packages, or part thereof, with a minimum of three different
sample plates, each taken from different bundles from any one item of a specific shipment.
TABLE 1 Electrolytic Tin Plate Coating Weight [Mass]
NOTE 1—Listed below are commonly produced coating weights
[masses]. By agreement between the producer and the purchaser, other
combinations of the coatings may be specified and the appropriate
minimum average test values will apply.
Nominal Tin Coating Minimum Average
Weight [Mass] each Coating Weight [Mass]
Designation No.
Surface, lb/base box [g/ each Surface Test
2 A
m ] Value, lb/base box
[g/m ]
B
5 [0.6 ⁄0.6] 0.025/0.025 [0.6 ⁄0.6] 0.02/0.02 [0.5 ⁄0.5]
10 [1.1 ⁄1.1] 0.05/0.05 [1.1/1.1] 0.04/0.04 [0.9/0.9]
15 [1.7 ⁄1.7] 0.075/0.075
...