ASTM A626/A626M-98
(Specification)Standard Specification for Tin Mill Products, Electrolytic Tin Plate, Double Reduced
Standard Specification for Tin Mill Products, Electrolytic Tin Plate, Double Reduced
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. or SI units [as A626M] which is supplied in thicknesses from 0.13 to 0.30 mm.
1.3 The values stated in either inch-pound or SI units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents. Therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 626/A 626M – 98
Standard Specification for
Tin Mill Products, Electrolytic Tin Plate, Double Reduced
This standard is issued under the fixed designation A 626/A 626M; 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 (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 3. Ordering Information
1.1 This specification covers double-reduced electrolytic tin 3.1 Orders for product under this specification shall include
plate produced from low-carbon cold-reduced steel furnished the following information, as required and applicable, to
in coils and cut sizes for use predominately in the manufacture describe adequately the desired product:
of cans. It is furnished in commercially available tin coating 3.1.1 Name of product (double-reduced electrolytic tin
weights [masses] and is normally supplied with a trimmed plate) (Section 1),
edge. 3.1.2 Tin coating weight [mass] designation, and marking, if
1.2 This specification is applicable to orders in either any (Section 5, Table 1, and Fig. 1 and Fig. 2),
inch-pound units (as A 626) which is supplied in thicknesses 3.1.3 Surface appearance and finish (Section 6),
from 0.0050 to 0.0118 in. or SI units [as A 626M] which is 3.1.4 Chemical treatment (Section 7),
supplied in thicknesses from 0.13 to 0.30 mm. 3.1.5 Oiling (Section 8),
1.3 The values stated in either inch-pound or SI units are to 3.1.6 Thickness (Specification A 623 [A 623M]) (consistent
be regarded as standard. Within the text, the SI units are shown with the intended application),
in brackets. The values stated in each system are not exact 3.1.7 Coil width or cut size in increments of ⁄16 in.,
equivalents. Therefore, each system must be used indepen- 3.1.8 Due to the very distinct directional properties, rolling
dently of the other. Combining values from the two systems direction must be specified on cut sizes by underlining the slit
may result in nonconformance with this specification. (rolling width) dimension (4) (consistent with the intended
1.4 This standard does not purport to address all of the application),
safety concerns, if any, associated with its use. It is the 3.1.9 Steel type (Specification A 623 [A 623M]),
responsibility of the user of this standard to establish appro- 3.1.10 Mechanical requirement designation (Specification
priate safety and health practices and determine the applica- A 623 [A 623M]) (consistent with the intended application),
bility of regulatory limitations prior to use. 3.1.11 Intended application,
3.1.12 Quantity in base boxes SITAS (see Note 3),
2. Referenced Documents
3.1.13 On coils, specify minimum or range of acceptable
2.1 ASTM Standards: inside diameters. The standard inside diameter is approxi-
A 623 Specification for Tin Mill Products, General Require-
mately 16 in. if ordered to Specification A 626 [410 mm if
ments ordered to Specification A 626M]. Coils should be specified to
A 623M Specification for Tin Mill Products, General Re-
a maximum coil weight if ordered to Specification A 626 [mass
quirements [Metric] if ordered to Specification A 626M] or maximum outside
A 630 Test Methods for Determination of Tin Coating
diameter, or both,
Weights for Hot-Dip and Electrolytic Tin Plate 3.1.14 Packaging,
A 754 Test Method for Coating Thickness by X-Ray Fluo-
3.1.15 Special requirements, where applicable (J = plate or
rescence K = plate), and
B 339 Specification for Pig Tin
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, D 50/25, melted, CDC, DOS,
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
0.0066-in. thickness, 30 by 34 ⁄16 in., MR, DR-8, for 307 3 401 welded
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
can bodies in accordance with Specification A 626. [250 SITAS, double-
A01.20 on Tin Mill Products.
reduced electrolytic tin plate, D 5.6/2.8, melted, CDC, DOS, 0.17-mm
Current edition approved Nov. 10, 1998. Published March 1999. Originally
published as A 626 – 68. Last previous edition A 626 – 95. thickness, 760 by 865 mm, MR, DR-8, for 99 3 105 mm welded can
Annual Book of ASTM Standards, Vol 01.06.
bodies to Specification A 626M].
Annual Book of ASTM Standards, Vol 02.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 626/A 626M – 98
TABLE 1 Electrolytic Tin Plate Coating Weight [Mass]
designation is expressed by showing the two tin coating
weights [masses] separated by a slash mark, for example, 50/25
NOTE 1—Listed as follows are commonly produced coating weights
[D 5.6/2.8]. The first number will represent the coating weight
[masses]. By agreement between the producer and the purchaser, other
combinations of the coatings may be specified and the appropriate [mass] on the outside of the coil or the top surface of the cut
minimum average test values will apply.
sizes.
Minimum Average Coating 5.1.3 In order to distinguish material having differential
Nominal Tin Coating
Weight [Mass] each Sur-
coatings, the face with the heavier coating is normally marked.
Designation No. Weight [Mass] each Sur-
face Test Value, lb/base
face, lb/base box [g/m ]
A 2
By arrangement, a special marking can be supplied on the
box [g/m ]
light-coated face (see Fig. 1 and Fig. 2). The letter D is shown
B
5 [0.6/0.6] 0.025/0.025 [0.6/0.6] 0.02/0.02 [0.5/0.5]
along with the coating number to indicate the side of the plate
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 [1.7/1.7] 0.06/0.06 [1.4/1.4]
to be marked.
20 [2.2/2.2] 0.10/0.10 [2.2/2.2] 0.08/0.08 [1.8/1.8]
5.2 Sampling for Tin Coating Weights [Masses]:
25 [2.8/2.8] 0.125/0.125 [2.8/2.8] 0.11/0.11 [2.5/2.5]
35 [3.9/3.9] 0.175/0.175 [3.9/3.9] 0.16/0.16 [3.6/3.6] 5.2.1 When the purchaser wishes to make tests to ascertain
50 [5.6/5.6] 0.25/0.25 [5.6/5.6] 0.23/0.23 [5.2/5.2]
compliance with the requirements of this specification for tin
75 [8.4/8.4] 0.375/0.375 [8.4/8.4] 0.35/0.35 [7.8/7.8]
coating weight [mass] on a lot of any specific item of
100 [11.2/11.2] 0.50/0.50 [11.2/11.2] 0.45/0.45 [10.1/10.1]
C
D 50/25 [D 5.6/2.8] 0.25/0.125 [5.6/2.8] 0.23/0.11 [5.2/2.5]
electrolytic tin plate, the following procedure shall be used:
D 75/25 [D 8.4/2.8] 0.375/0.125 [8.4/2.8] 0.35/0.11 [7.8/2.5]
5.2.1.1 Coils—One test strip shall be taken at random from
D 100/25 [D 11.2/2.8] 0.50/0.125 [11.2/2.8] 0.45/0.11 [10.1/2.5]
a representative section of each coil across its width. A
D 100/50 [D 11.2/5.6] 0.50/0.25 [11.2/5.6] 0.45/0.23 [10.1/5.2]
D 135/25 [D 15.2/2.8] 0.675/0.125 [15.2/2.8] 0.62/0.11 [14.0/2.5]
minimum of three test strips, each taken from different coils
A
The minimum spot value shall be not less than 80 % of the minimum average from any one item of a specific lot shall be selected.
coating weight [mass] (see 5.3 and 5.4).
5.2.1.2 From one or two coil lots, each coil should be
B
Some No. 5 melted applications may require revised minimum and maximum
sampled. A minimum of three randomly selected test strips
levels for fully alloyed end uses.
C
The letter D on differentially coated tin plate indicates the coated surface to be
shall represent the lot.
marked. For example, the examples indicate that the heavy-coated side is marked
5.2.1.3 Cut Sizes—One sheet shall be taken at random from
(see 5.1.2 and 5.1.3).
each 50 packages or part thereof, with a minimum of three
different sample plates, each taken from different bundles from
NOTE 2—The production of coils does not afford the same opportunity
any one item of a specific shipment.
for inspection, grading, and sorting as does the production of cut sizes.
Accordingly, appropriate processing and quality control procedures are
5.2.2 Each test sheet shall be spot tested at a minimum of
required by the purchaser to obtain optimum utilization of the material.
three locations across the rolling direction of the sheet. Spot
Cut sizes are line inspected visually and mechanically during production. 2 2
tests are customarily disks or sq
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