ASTM B928-03

Standard Specification for High Magnesium Aluminum-Alloy Sheet and Plate for Marine Service

SCOPE
1.1 This specification covers high magnesium (Note 1) marine application aluminum-alloy (Note 2), in those alloy-tempers shown in Table 2 [Table 3], for flat sheet, coiled sheet, and plate, in the mill finish:Note 2
The term high magnesium in the general sense includes those alloys containing 3 % or more nominal magnesium.
Note 1—Throughout this specification use of the term alloy in the general sense includes aluminum as well as aluminum alloy.
1.2 Alloy and temper designations are in accordance with ANSI H35.1 [H35.1M]. The equivalent Unified Numbering System alloy designations are those ofTable 1 preceded by A9, for example, A95083 for 5083 in accordance with Practice E 527.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore each system shall be used independently of each other. Combining values from the two systems may result in non-conformance with the standard.
1.4 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.

General Information

• Status: Historical
• Publication Date: 09-Jul-2003
• ICS: 47.020.01 - General standards related to shipbuilding and marine structures
• ICS: 77.120.01 - Non-ferrous metals in general
• Technical Committee: B07 - Light Metals and Alloys
• Drafting Committee: B07.03 - Aluminum Alloy Wrought Products

Relations

• Replaced By: ASTM B928-04 - Standard Specification for High Magnesium Aluminum-Alloy Sheet and Plate for Marine Service
• Effective Date: 01-Feb-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B 928 – 03
Standard Specification for
High Magnesium Aluminum-Alloy Sheet and Plate for Marine
Service
This standard is issued under the fixed designation B 928; 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.
1. Scope B 881 Terminology Related to Aluminum- and Magnesium-
Alloy Products
1.1 This specification covers high magnesium (Note 1)
E 3 Practice for Preparation of Metallographic Specimens
marine application aluminum-alloy (Note 2), in those alloy-
E 29 Practice for Using Significant Digits in Test Data to
tempers shown in Table 2 [Table 3], for flat sheet, coiled sheet,
Determine Conformance with Specifications
and plate, in the mill finish:
E 34 Test Methods for Chemical Analysis of Aluminum and
NOTE 1—The term high magnesium in the general sense includes those 5
Aluminum-Base Alloys
alloys containing 3 % or more nominal magnesium.
E 55 Practice for Sampling Wrought Nonferrous Metals and
NOTE 2—Throughout this specification use of the term alloy in the
Alloys for Determination of Chemical Composition
general sense includes aluminum as well as aluminum alloy.
E 407 Test Methods for Microetching Metals and Alloys
1.2 Alloy and temper designations are in accordance with
E 527 Practice for Numbering Metals and Alloys (UNS)
ANSI H35.1 [H35.1M]. The equivalent Unified Numbering
E 607 Test Method for Atomic Emission Spectrometric
System alloy designations are those of Table 1 preceded by A9,
Analysis Aluminum Alloys by the Point-to-Plane Tech-
for example, A95083 for 5083 in accordance with Practice 5
nique, Nitrogen Atmosphere
E 527.
E 716 Practices for Sampling Aluminum and Aluminum
1.3 The values stated in either SI units or inch-pound units 5
Alloys for Spectrochemical Analysis
are to be regarded separately as standard. The values stated in
E 1251 Test Method for Optical Emission Spectrometric
each system may not be exact equivalents; therefore each
Analysis of Aluminum and Aluminum Alloys by the Argon
system shall be used independently of each other. Combining
Atmosphere, Point-to-Plane, Unipolar Self-Initiating Ca-
values from the two systems may result in non-conformance 5
pacitor Discharge
with the standard.
G 66 Test Method for Visual Assessment of Exfoliation
1.4 For acceptance criteria for inclusion of new aluminum
Corrosion Susceptibility of 5xxx Series Aluminum Alloys
and aluminum alloys in this specification, see Annex A2.
(ASSET Test)
G 67 Test Method for Determining the Susceptibility to
2. Referenced Documents
Intergranular Corrosion of 5xxx Series Aluminum Alloys
2.1 The following documents of the issue in effect on the
by Mass Loss After Exposure to Nitric Acid (NAMLT
date of material purchase, unless otherwise noted, form a part
Test)
of this specification to the extent referenced herein:
2.3 ANSI Standards:
2.2 ASTM Standards:
H35.1 Alloy and Temper Designation Systems for Alumi-
B 557 Test Methods of Tension Testing Wrought and Cast
num
Aluminum- and Magnesium-Alloy Products
H35.1(M) Alloy and Temper Designation Systems for Alu-
B 557M Test Methods of Tension Testing Wrought and Cast
minum
Aluminum- and Magnesium-Alloy Products [Metric]
H35.2 Dimensional Tolerances for Aluminum Mill Prod-
B 660 Practices for Packaging/Packing of Aluminum and
ucts
Magnesium Products
B 666/B 666M Practice for Identification Marking of Alu-
minum and Magnesium Products
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02.
1 5
This specification is under the jurisdiction of ASTM Committee B07 on Light Annual Book of ASTM Standards, Vol 03.05.
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on Annual Book of ASTM Standards, Vol 01.01.
Aluminum-Alloy Wrought Products. Annual Book of ASTM Standards, Vol 03.02.
Current edition approved July 10, 2003. Published October 2003. Available in the Related Materials section (gray pages) of the Annual Book of
Annual Book of ASTM Standards, Vol 02.02. ASTM Standards, Vol 02.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B928–03
A,B,C
TABLE 1 Chemical Composition Limits
D
Other Elements
Alloy Silicon Iron Copper Manganese Magnesium Chromium Zinc Titanium Aluminum
E
Each Total
5083 0.40 0.40 0.10 0.40 to 1.0 4.0 to 4.9 0.05 to 0.25 0.25 0.15 0.05 0.15 remainder
5086 0.40 0.50 0.10 0.20 to 0.7 3.5 to 4.5 0.05 to 0.25 0.25 0.15 0.05 0.15 remainder
5456 0.25 0.40 0.10 0.50 to 1.0 4.7 to 5.5 0.05 to 0.20 0.25 0.20 0.05 0.15 remainder
A
Limits are in weight percent maximum unless shown as a range or stated otherwise.
B
Analysis shall be made for the elements for which limits are shown in this table.
C
For purposes of determining conformance to these limits, an observed value or a calculated value attained from analysis shall be rounded to the nearest unit in the
last right-hand place of figures used in expressing the specified limit, in accordance with the rounding-off method of Practice E 29.
D
Others include listed elements for which no specific limit is shown, as well as unlisted metallic elements, but doesn’t include elements shown with composition limits
in the footnotes. The producer may analyze samples for trace elements not specified in the specification. However, such analysis is not required and may not cover all
metallic Others elements. Should any analysis by the producer or the purchaser establish that an Others element exceeds the limit of Each or that the aggregate of several
Others elements exceeds the limit of Total, the material shall be considered nonconforming.
E
Other Elements—Total shall be the sum of unspecified metallic elements 0.010 % or more, rounded to the second decimal before determining the sum.
A,B
TABLE 2 Mechanical Property Limits, Inch-Pound Units
Tensile Strength, ksi Yield Strength (0.2 % offset), ksi
Specified Thickness, Elongation in 2 in.
Temper
in. or 43 Diameter, min, %
min max min max
Alloy 5083
H116 0.063 to 0.499 44.0 . . . 31.0 . . . 10
0.500 to 1.250 44.0 . . . 31.0 . . . 12
1.251 to 1.500 44.0 . . . 31.0 . . . 12
1.501 to 3.000 41.0 . . . 29.0 . . . 12
H321 0.188 to 1.500 44.0 56.0 31.0 43.0 12
1.501 to 3.000 41.0 56.0 29.0 43.0 12
Alloy 5086
H116 0.063 to 0.249 40.0 . . . 28.0 . . . 8
0.250 to 0.499 40.0 . . . 28.0 . . . 10
0.500 to 1.250 40.0 . . . 28.0 . . . 10
1.251 to 2.000 40.0 . . . 28.0 . . . 10
Alloy 5456
H116 0.063 to 0.499 46.0 . . . 33.0 . . . 10
0.500 to 1.250 46.0 . . . 33.0 . . . 12
1.251 to 1.500 44.0 . . . 31.0 . . . 12
1.501 to 3.000 41.0 . . . 29.0 . . . 12
3.001 to 4.000 40.0 . . . 25.0 . . . 12
H321 0.188 to 0.499 46.0 59.0 33.0 46.0 12
0.500 to 1.500 44.0 56.0 31.0 44.0 12
1.501 to 3.000 41.0 54.0 29.0 43.0 12
A
To determine conformance to this specification, each value for tensile strength and for yield strength shall be rounded to the nearest 0.1 ksi and each value for
elongation to the nearest 0.5 %, both in accordance with the rounding method of Practice E 29.
B
The basis for establishment of mechanical property limits is shown in Annex A1.
H35.2(M) Dimensional Tolerances for Aluminum Mill 3.2.4 stress-corrosion cracking—a cracking process that
Products
requires the simultaneous action of a corrodent, and sustained
tensile stress. (This excludes corrosion-reduced sections, which
3. Terminology
fail by fast fracture. It also excludes intercrystalline or tran-
3.1 Definitions—Refer to Terminology B 881 for definitions scrystalline corrosion which can disintegrate an alloy without
of product terms used in this specification. either applied or residual stress.)
3.2 Definitions of Terms Specific to This Standard:
3.2.1 exfoliation—corrosion that proceeds laterally from the
4. Ordering Information
sites of initiation along planes parallel to the original rolling
4.1 Orders for material to this specification shall include the
surface, generally at grain boundaries, forming corrosion
following information:
products that force metal away from the body of the material,
4.1.1 This specification designation (which includes the
giving rise to a layered appearance.
number, the year, and the revision letter, if applicable),
3.2.2 intergranular corrosion—corrosion that preferentially
occurs at, or adjacent to, the grain boundaries of a metal or
4.1.2 Quantity in pieces or pounds [kilograms],
alloy.
4.1.3 Alloy (see 7.1 and Table 1),
3.2.3 sensitization—the development of a continuous or
4.1.4 Temper (see 8.1 and Table 2 [Table 3]),
nearly continuous grain boundary precipitate in 5xxx alloy-
4.1.5 For sheet, whether flat or coiled, and
temper material, that causes the material to be susceptible to
intergranular forms of corrosion. 4.1.6 Dimensions (thickness, width, and length or coil size).
B928–03
A,B
TABLE 3 Mechanical Property Limits [SI Units]
C
Specified Thickness, mm Tensile Strength, MPa Yield Strength (0.2 % offset), MPa Elongation, min, %
Temper
in 53 Diameter
over through min max min max in 50 mm
(5.65 A )
=
Alloy 5083
H116 1.60 12.50 305 . . . 215 . . . 10 . . .
12.50 30.00 305 . . . 215 . . . . . . 10
30.00 40.00 305 . . . 215 . . . . . . 10
40.00 80.00 285 . . . 200 . . . 10
H321 4.00 12.50 305 385 215 295 12 . . .
12.50 40.00 305 385 215 295 . . . 10
40.00 80.00 285 385 200 295 . . . 10
Alloy 5086
H116 1.60 6.30 275 . . . 195 . . . 8 . . .
6.30 12.50 275 . . . 195 . . . 10 . . .
12.50 30.00 275 . . . 195 . . . . . . 9
30.00 50.00 275 . . . 195 . . . . . . 9
Alloy 5456
H116 1.60 12.50 315 . . . 230 . . . 10 . . .
12.50 30.00 315 . . . 230 . . . . . . 10
30.00 40.00 305 . . . 215 . . . . . . 10
40.00 80.00 285 . . . 200 . . . . . . 10
80.00 110.00 275 . . . 170 . . . . . . 10
H321 4.00 12.50 315 405 230 315 12 . . .
12.50 40.00 305 385 215 305 . . . 10
40.00 80.00 285 370 200 295 . . . 10
A
To determine conformance to this specification, each value for tensile strength and for yield strength shall be rounded to the nearest 1 MPa and each value for
elongation to the nearest 0.5 %, both in accordance with the rounding method of Practice E 29.
B
The basis for establishment of mechanical property limits is shown in Annex A1.
C
Elongations in 50 mm apply for thicknesses up through 12.50 mm and in 53 diameter (5.65 =A ) for thicknesses over 12.50 mm where A is the cross-sectional area
of the specimen.
4.2 Additionally, orders for material to this specification requirements of this specification and shall be commercially
shall include the following information when required by the sound. Any requirement not so covered is subject to negotia-
purchaser: tion between producer and purchaser.
4.2.1 Whether inspection or witness of inspection and tests
6.2 Each coil, sheet and plate shall be examined to deter-
by the purchaser’s representative is required prior to material
mine conformance to this specification with respect to general
shipment (see 11.1),
quality and identification marking. On approval of the pur-
4.2.2 Whether Practices B 660 applies and, if so, the levels
chaser, however, the producer may use a system of statistical
of preservation, packaging, and packing required (see 15.3),
quality control for such examinations.
and
4.2.3 Whether certification is required (see Section 13).
7. Chemical Composition
7.1 Limits—The sheet and plate shall conform to the chemi-
5. Responsibility for Quality Assurance
cal composition limits specified in Table 1. Conformance shall
5.1 Responsibility for Inspection and Tests—Unless other-
be determined by the producer, by the analysis of samples
wise specified in the contract or purchase order, the producer is
taken at the time the ingots are cast or samples taken from the
responsible for the performance of all inspection and test
finished or semifinished product. If the producer has deter-
requirements specified herein. The producer may use his own
mined the chemical composition of the material during the
or any other suitable facilities for the performance of the
course of manufacture, additional sampling and analysis of the
inspection and test requirements specified herein, unless dis-
finished product shall not be required.
approved by the purchaser in the order or at the time of contract
7.2 Number of Samples—The number of samples taken for
signing. The purchaser shall have the right to perform any of
determination of chemical composition shall be as follows:
the inspections and tests set forth in this specification where
7.2.1 When samples are taken at the time the ingots are cast,
such inspections are deemed necessary to ensure that material
at least one sample shall be taken for each group of ingots cast
conforms to prescribed requirements.
simultaneously from the same source of molten metal.
5.2 Lot Definition—An inspection lot shall consist of an
7.2.2 When samples are taken from the finished or semifin-
identifiable quantity of material of the same mill form, alloy,
ished product, a sample shall be taken to represent each 4000
temper, cast or melt lot and thickness, subjected to inspection
lb [2000 kg] or fraction thereof, of material in the lot, except
at one time.
that not more than one sample shall be required per piece.
6. General Quality
7.3 Methods of Sampling—Samples for determination of
6.1 Unless otherwise specified, the material shall be sup- chemical composition shall be taken in accordance with one of
plied in the mill finish, shall be uniform as defined by the the following methods:
B928–03
the morphology of the grain structure and on the residual and applied
7.3.1 Samples for chemical analysis shall be taken by
stresses that are present. The extent of corrosion that will occur depends
drilling, sawing, milling, turning, or clipping a representative
on the degree of continuity of the grain boundary precipitation and the
piece or pieces to obtain a prepared sample of not less than 75
corrosiveness of the environment. Re-crystallized 5xxx alloys that have
g. Sampling shall be in accordance with Practice E 55.
been sensitized, are susceptible to intergranular corrosion, and when
7.3.2 Sampling for spectrochemical analysis shall be in
subjected to sustained tensile stress, may exhibit intergranular stress
accordance with Practices E 716. Samples for other methods of
corrosion cracking. Un-re-crystallized 5xxx alloys that have been sensi-
analysis shall be suitable for the form of material being tized are susceptible to exfoliation corrosion.
analyzed and the type of analytical method used.
9.2 Exfoliation-Corrosion Resistance—The alloy-te
...