GB/T 3880.3-2024 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3880.3-2024 | English | 395 |
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Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 3: Tolerances on forms and dimensions
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| GB/T 3880.3-2012 | English | 125 |
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Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering -- Part 3: Tolerances on forms and dimensions
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| GB/T 3880.3-2006 | English | 519 |
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Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering -- Part 3: Tolerances on forms and dimensions
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Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 3880.3-2024
GB/T 3880.3-2024: Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 3: Tolerances on forms and dimensions
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3880.3-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Replacing GB/T 3880.3-2012
Wrought aluminum and aluminum alloy plates, sheets and
strips for general engineering - Part 3.Tolerances on forms
and dimensions
Issued on. APRIL 25, 2024
Implemented on. NOVEMBER 01, 2024
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Symbols... 6
5 Deviation grade... 7
6 Technical requirements... 7
7 Test methods... 20
1 Scope
This document specifies the dimensional deviation grade, technical requirements, test
methods of general industrial aluminum and aluminum alloy plates and strips.
This document applies to general industrial aluminum and aluminum alloy rolled plates
and strips (hereinafter referred to as "plates and strips").
2 Normative references
The contents of the following documents constitute the essential terms of this document
through normative references in the text. Among them, for dated references, only the
version of that date applies to this document; for undated references, the latest version
(including all amendments) applies to this document.
GB/T 1031 Geometrical product specifications (GPS) - Surface texture. Profile
method - Surface roughness parameters and their values
GB/T 8005.1 Aluminium and aluminium alloy terms and definitions - Part 1.
Product and method of processing and treatment
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 26492.3 Defects of wrought aluminium and aluminium alloys ingots and
products - Part 3.Defects for plates, sheets and strips
3 Terms and definitions
The terms and definitions, which are defined in GB/T 8005.1 and GB/T 26492.3, apply
to this document.
4 Symbols
The symbols in Table 1 apply to this document.
5 Deviation grade
The dimensional deviation grade of plates and strips shall comply with the provisions of Table 2.
6 Technical requirements
6.1 Thickness
6.1.1 Single point thickness deviation
6.1.1.1 Cold-rolled plate and strip
6.1.1.2 Hot-rolled plates and strips
6.1.2 Thickness range
The thickness range of plates and strips in the same batch (the difference between the
maximum and minimum measured thickness) shall comply with the provisions of Table
8.When the purchaser has special requirements for the thickness range, it shall be
determined by negotiation between the supplier and buyer and indicated in the order (or
contract).
6.2 Width
6.2.1 Width deviation of plates
6.2.1.1 The width deviation of plates is divided into ordinary grade and high-precision
grade. When the purchaser requires high-precision grade, it shall be determined by
negotiation between the supplier and buyer and indicated in the order form (or contract).
6.2.2 Width deviation of strip
6.2.2.1 The width deviation of strip is divided into ordinary grade and high precision
grade. When the purchaser requires high precision grade, it shall be determined by
negotiation between the supplier and buyer and indicated in the order (or contract). If
not indicated, it shall be ordinary grade.
6.2.2.2 The width deviation of strip of finished product secondary trimming shall
comply with the provisions of Table 10.When the purchaser requires positive or
negative symmetrical deviation, it shall be indicated in the order (or contract); the
allowable deviation value is half of the value in Table 10.
6.3 Length
6.3.1 The length deviation of the plate is divided into ordinary grade and high precision
grade. When the purchaser requires high precision grade, it shall be determined by
negotiation between the supplier and buyer and indicated in the order (or contract). If
not indicated, it shall be based on ordinary grade.
6.3.2 The length deviation of the plate shall comply with the provisions of Table 11.
When the purchaser requires positive and negative symmetrical deviations, it shall be
6.4 Unevenness
6.4.1 The unevenness of the plate is divided into ordinary grade and high-precision
grade. When the purchaser requires high-precision grade, the supplier and buyer shall
negotiate and determine, meanwhile indicate it in the order form (or contract). If it is
not indicated, the ordinary grade shall be used. The ordinary grade unevenness of the
plate shall comply with the provisions of Table 12; the high-precision grade unevenness
shall comply with the provisions of Table 13.
6.5 Side curvature
6.6 Diagonal
The diagonal deviation of the plate is divided into ordinary grade and high-precision
grade. When the buyer requires high-precision grade, it shall be determined by
negotiation between the supplier and buyer and indicated in the order form (or contract).
If not indicated, the ordinary grade shall be used. The diagonal deviation of the plate
shall comply with the provisions of Table 18 for ordinary grade and Table 19 for high-
precision grade.
6.7 Center convexity
When the buyer has requirements for the center convexity of plates and strips, the
supplier and buyer shall negotiate and determine, meanwhile indicate in the order (or
contract). The convexity of the mother plate or mother strip of the plate or strip shall be
0% ~ 1.5%.
6.8 Roughness
When the purchaser has requirements for the surface roughness of cold-rolled plates
and strips, the supplier and the purchaser shall negotiate and determine, meanwhile
indicate it in the order (or contract). The surface roughness (Ra) of cold-rolled plates
and strips shall not exceed 0.50 μm.
6.9 Staggered layers and tower shapes
The staggered layers of strips shall not exceed 3 mm; the tower shape shall not exceed
10 mm (except for the inner 5 circles and the outer 2 circles). When the purchaser has
special requirements for the staggered layers and tower shapes of strips, the supplier
and the purchaser shall negotiate and determine, meanwhile indicate it in the order (or
contract).
6.10 Others
Where there are other requirements for the dimensional deviation of plates and strips,
the supplier and the purchaser shall negotiate and determine, meanwhile indicate it in
the order (or contract).
7 Test methods
7.1 Dimension rounding
Dimension measurement values are not allowed to be rounded off; the method for
determining the limit value shall comply with the provisions of GB/T 8170.
7.2 Thickness
The thickness of plates and strips shall be measured at a distance of not less than 10
mm from the side and not less than 115 mm from the end, using a micrometer which
has an accuracy of 0.01 mm or a measuring tool which has the same accuracy.
7.3 Width and length
The width and length of plates and strips shall be measured using tools which have
corresponding accuracy.
7.4 Unevenness
7.4.1 Unevenness of plate
7.4.1.1 General requirements
7.4.1.2 Single wave unevenness
7.4.1.3 Multiple waves
7.4.2 Unevenness of strip
Cut a specimen from the strip; the specimen length is 1000 mm ~ 2000 mm, which
contains at least one wave; measure the unevenness of the strip according to 7.4.1.
7.5 Side curvature
Draw a straight line (preferably a polyamide line) between the two ends of the plate
side, or any two points on the side of the strip 2000 mm (or specified length) apart; then
use a ruler (or triangle ruler) to measure the maximum vertical distance between the
plate or strip side and the straight line, which is the side curvature (d1), as shown in
Figure 7.
7.6 Diagonal
The allowable deviation of the diagonal of the plate is to measure the length of the two
diagonals AA and BB using a steel tape measure at an accuracy of 1 mm and then
calculate the difference, as shown in Figure 8.
7.7 Center convexity
Use an outside micrometer, which has an accuracy of 0.001, to measure the center
thickness and the thickness of both sides of any cross section of the mother plate or
mother strip of the plate or strip, as shown in Figure 9.The center convexity (Cw) of
plates and strips is calculated according to formula (1); the value is expressed as a
percentage. The calculation result is expressed to one decimal place; the value is
rounded according to the provisions of GB/T 8170.
7.8 Roughness
Measure the surface roughness perpendicular to the rolling direction according to the
provisions of GB/T 1031.Take not less than 1 sample from each batch, to make
measurement at the two sides, the center, the two ribs (a total of 5 positions, as shown
in Figure 10); take the average value. The calculation result is expressed to two decimal
places; the value is rounded according to the provisions of GB/T 8170.If there is
obvious color difference visible to the naked eye, the measurement result shall include
the uneven color.
7.9 Staggered layer, tower shape
7.9.1 Staggered layer
Use a steel ruler, which has an accuracy of 1 mm, to measure the maximum distance of
the shift between the strip layers.
7.10 Others
Other dimensional measurement methods for plates and strips shall be determined by
negotiation between the supplier and the buyer, meanwhile it shall be indicated in the
order (or contract).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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