ASTM A626/A626M-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: A626/A626M − 16 A626/A626M − 22
Standard Specification for
Tin Mill Products, Electrolytic Tin Plate, Double Reduced
This standard is issued under the fixed designation A626/A626M; 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*
1.1 This specification covers double-reduced electrolytic tin plate produced from low-carbon cold-reduced steel furnished in coils
and cut sizes for use predominately in the manufacture of cans. 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 A626) which is supplied in thicknesses from 0.0050
to 0.0118 in. 0.0118 in. or SI units [as A626M] which is supplied in thicknesses from 0.127 to 0.300 mm.0.300 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 safety, health, and healthenvironmental 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 Dec. 1, 2016March 1, 2022. Published December 2016March 2022. Originally approved in 1968. Last previous edition approved in 20132016
as A626/A626M -13. – 16. DOI: 10.1520/A0626_A0626M-16.10.1520/A0626_A0626M-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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A626/A626M − 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 (double-reduced electrolytic tin plate) (Section 1),
3.1.2 Tin coating weight [mass] designation, and marking, if any (Section 5, Table 1, and FigFigs. 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 width or cut size in increments of ⁄16 in. or 1 mm, 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]),
3.1.10 Mechanical requirement designation (Specification A623 [A623M]) (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 to Specification A626 [410 mm [410 mm if ordered to Specification A626M]. Coils should be specified to a
maximum coil weight if ordered to Specification A626 [mass if ordered to Specification A626M] 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 number and year of issue.
NOTE 1—A typical ordering description is as follows: 1000 base boxes, double-reduced electrolytic tin plate, D50/25, melted, CDC, ATBC,
0.0066-in.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-reduced electrolytic 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 105 mm
welded can bodies to Specification A626/A626M - 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-2 BA, 7C,
3 7
0.0110 in. thickness, 30 ⁄4 in. in. by 30 ⁄16 in., in., for 307 diameter general line rings in accordance with Specification A626/A626M -XX. [100 SITAs,
single reduced electrolytic tin plate, 2.8/2.8, ATBC, MR, DR-8 CA, 7C, 0.28 mm thickness, 781 by 773 mm, 773 mm, for 99 by 105 mm 105 mm welded
can bodies to Specification A626/A626M -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, double-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, double-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 ].
A626/A626M − 22
4. Rolling Direction
4.1 Double-reduced plate is stronger and less ductile than single reduced plate and has very distinct directional properties. The
rolling direction must be specified on cut sizes and will be indicated by underlining the slit (rolling width) dimension. To minimize
the flange-cracking hazard when the product is used for can bodies, the rolling direction must be around the circumference of the
can.
5. Tin Coating Weight [Mass]
5.1 Class Designation and Marking:
5.1.1 Electrolytic tin plate is commonly produced to the class designations shown in Table 1. Other combinations of coatings may
be specified by agreement between the producer and the purchaser.
5.1.2 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, 50/25 [D
5.6/2.8]. 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.
5.1.3 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.
5.2 Sampling for Tin Coating Weights [Masses]:
5.2.1 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:
5.2.1.1 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.
TABLE 1 Electrolytic Tin Plate Coating Weight [Mass]
NOTE 1—Listed as follows 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 Coating
Weight [Mass] each Weight [Mass] each Sur-
Designation No.
Surface, lb/base box [g/ face Test Value, lb/base
2 A 2
m ] 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]
...