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GB/T 40391-2021 PDF in English


GB/T 40391-2021 (GB/T40391-2021, GBT 40391-2021, GBT40391-2021)
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GB/T 40391-2021: PDF in English (GBT 40391-2021)

GB/T 40391-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Aluminum matrix composite wafers
铝基复合圆片
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
FOREWORD ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 5 
4 Product classification ... 5 
5 Requirements ... 6 
6 Test methods ... 9 
7 Inspection rules ... 11 
8 Marking, packaging, transportation, storage and quality certificate ... 14 
9 Order form (or contract) contents ... 15 
Appendix A (Normative) Test method for peel strength between layers ... 17 
Aluminum matrix composite wafers
1 Scope
This document specifies the product classification, requirements, test methods,
inspection rules and marking, packaging, transportation, storage, and quality
certificates and order form (or contract) contents of aluminum matrix composite wafers.
This document applies to aluminum matrix composite wafers for cooking pots and pans,
including aluminum matrix composite wafers produced by rolling composite and
explosive composite methods (hereinafter referred to as composite wafers).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 223 (all parts), Methods for chemical analysis of iron, steel and alloy
GB/T 700, Carbon structural steels
GB/T 3190, Wrought aluminum and aluminum alloy - Chemical composition
GB/T 3199, Wrought aluminium and aluminium alloy products - Packing, marking,
transporting and storing
GB/T 3246.1, Inspection method for structure of wrought aluminum and aluminum
alloy products - Part 1: Inspection method for microstructure
GB/T 3880.3, Wrought aluminium and aluminium alloy plates, sheets and strips for
general engineering - Part 3: Tolerances on forms and dimensions
GB/T 4156, Metallic materials - Sheet and strip - Erichsen cupping test
GB/T 7999, Optical emission spectrometric analysis method of aluminum and
aluminum alloys
GB/T 8170, Rules of rounding off for numerical values & expression and judgment
of limiting values
GB/T 16865, Test pieces and method for tensile test for wrought aluminium and
magnesium alloys products
GB/T 17432, Methods of sampling for analyzing the chemical composition of
wrought aluminum and aluminum alloys
GB/T 20066, Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20878, Stainless and heat-resisting steels - Designation and chemical
composition
GB/T 20975 (all parts), Methods for chemical analysis of aluminium and aluminium
alloys
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1
clad layer
Other single-layer metals other than aluminum and aluminum alloy matrix in aluminum
matrix composite wafers.
3.2
clad ratio
The metal thickness of the clad layer (3.1) as a percentage of the total thickness of the
aluminum matrix composite wafer (3.3).
3.3
aluminum matrix composite wafers
A circular sheet made of two or more metal materials (aluminum and aluminum alloys
as the matrix) after rolling composite or explosive composite.
4 Product classification
4.1 Designation, food contact layer, clad ratio and dimensions
According to the number of layers, composite wafers are divided into three types: multi-
layer (steel/multi-layer aluminum/steel), three-layer (steel/aluminum/steel) and two-
layer (steel/aluminum), where the typical designation, food contact layer, clad ratio and
dimensions are shown in Table 1. Where the buyer has special requirements on the
number of layers, designation, food contact layer, clad ratio, designations, and the state
6.2.3 Diameter
Use a steel tape with an accuracy of 0.1 mm or a tool with corresponding accuracy for
the measurement.
6.2.4 Unevenness
6.2.4.1 Total unevenness
Take a whole piece of composite wafer and use a tool with a resolution of 1 mm to
measure its diameter. Then, put it freely on the platform, according to the provisions of
GB/T 3880.3; use a feeler gauge with a resolution of 0.1 mm to measure the wave height;
the ratio of the wave height to the diameter is the total unevenness of the composite
wafer.
6.2.4.2 Local unevenness
For a composite wafer with a diameter of not less than 300 mm, take the entire
composite wafer and place it freely on the platform. According to the method specified
in GB/T 3880.3, use a tool with a resolution of 1 mm to measure any chord length; use
a feeler gauge with a resolution of 0.1 mm to measure the corresponding wave height;
the ratio of the wave height to the chord length is the local unevenness of the composite
wafer.
6.3 Clad ratio
First, measure the thickness of each layer according to the provisions of GB/T 3246.1,
then, calculate the clad ratio Fi according to Formula (1); express the value in % (see
Figure 1 for the cross-sectional diagram of the composite wafer):
Where:
ti – thickness of a single clad layer, in millimeters (mm);
h – total thickness of the aluminum matrix composite wafer, in millimeters (mm).
7.1.1 The product shall be inspected by the supplier to ensure that the product quality
conforms to the provisions of this document and the order form (or contract); the quality
certificate shall be filled out.
7.1.2 The buyer shall inspect the received products according to the provisions of this
document. If the inspection result does not conform to the provisions of this document
and the order form (or contract), it shall be submitted to the supplier in written form,
and the supplier and the buyer shall negotiate and resolve. Objections of appearance
quality and dimensional deviation shall be filed within one month from the date of
receipt of the product; objections of other performances shall be filed within three
months from the date of receipt of the product. Arbitration, if required, may be carried
out by an organization which is recognized by both the supplier and the buyer; the
sampling shall be jointly done at the buyer.
7.2 Batch
Products shall be submitted for acceptance in batches, and each batch shall be composed
of products of the same designation, state of aluminum and aluminum alloy, food
contact layer, clad ratio, and dimensions. There is no limit to the weight of each batch.
7.3 Weight
The product shall be weighed on the scales.
7.4 Inspection items
7.4.1 Each batch of composite wafers shall be inspected for chemical composition,
dimensional deviation, clad ratio, tensile mechanical properties at room temperature,
peel strength between layers, cup drawing performance and appearance quality.
7.4.2 The cooling and heating cycle performance shall be guaranteed by the supplier’s
process. When the buyer requests the testing of the cooling and heating cycle
performance, the inspection frequency shall be negotiated between the supplier and the
buyer, and shall be indicated in the order form (or contract).
7.5 Sampling
Sampling shall be in accordance with Table 9.
results of sample properties are still unsatisfactory in the repeated test, then, judge the
batch of products to be unqualified.
7.6.6 When the cooling and heating cycle performance of any product is unqualified, a
double number of samples shall be taken from the batch of products for a repeated test.
If all the repeated test results are qualified, judge the batch of products to be qualified.
If the results of sample properties are still unsatisfactory in the repeated test, then, judge
the batch of products to be unqualified.
7.6.7 When the cup drawing performance of any sample is unqualified, a double number
of samples shall be taken from the batch of products for a repeated test. If all the
repeated test results are qualified, judge the batch of products to be qualified. If the
results of sample properties are still unsatisfactory in the repeated test, then, judge the
batch of products to be unqualified.
7.6.8 When the burrs of any product are unqualified, judge the batch of products as
unqualified. After negotiation between the supplier and the buyer, one-by-one
inspection is allowed, and the qualified ones will be delivered. When other appearance
quality of any product is unqualified, judge the piece of product as unqualified.
8 Marking, packaging, transportation, storage and quality
certificate
8.1 Marking
8.1.1 Product marking
8.1.1.1 A mark (or label) shall be printed on the top wafer of the qualified stack:
a) product name;
b) designation;
c) state of aluminum and aluminum alloy;
d) clad ratio;
e) dimensions;
f) product batch number;
g) net weight;
h) the inspection seal of the supplier's quality inspection department (or the signature
or seal of the quality inspector).
8.1.1.2 The food contact layer of the composite wafer shall be marked (e.g. scribed).
8.1.2 Package marking
The package marking of the product shall comply with the provisions of GB/T 3199.
8.2 Packaging, transportation and storage
The composite wafers shall not be oiled or packed with paper. When the buyer requires
oiling or padding, it shall be determined through negotiation between the supplier and
the buyer, and shall be indicated in the order form (or contract). Other requirements are
in accordance with the provisions of GB/T 3199.
8.3 Quality certificate
Each batch of composite wafers shall be accompanied by a product quality certificate,
which shall include the following:
a) name of the supplier;
b) product name:
c) designation, state of aluminum and aluminum alloy, dimensions and clad ratio;
d) batch number;
e) net weight and quantity;
f) number of this document;
g) results of each analysis and inspection, and the inspection seal from the supplier's
quality inspection department;
h) date of packaging (or date of manufacture).
9 Order form (or contract) contents
An order form (or contract) for the products listed in this document shall include the
following:
a) product name;
b) designation;
c) state of aluminum and aluminum alloy;
d) clad ratio;
e) dimensions;
f) weight (or number of sheets);
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.