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GB/T 33912-2017 (GB/T33912-2017)

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GB/T 33912-2017: PDF in English (GBT 33912-2017)
GB/T 33912-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
H 61
Wrought aluminum and aluminum alloy ingots
made of high pure materials
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: JUNE 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test methods ... 10 
5 Inspection rules ... 12 
6 Marks, packaging, transport, storage and quality certificate ... 14 
7 Contents of order sheet (or contract) ... 15 
Wrought aluminum and aluminum alloy ingots
made of high pure materials
1 Scope
This Standard specifies requirements, test methods, inspection rules, marks,
packaging, transport, storage as well as contents quality certificate and order
sheet (or content) for wrought aluminum and aluminum alloy ingots made of
high pure materials.
This Standard is applicable to wrought aluminum and aluminum alloy ingots
that require low content of impurity elements (hereinafter referred to as ingots).
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 3190, Wrought aluminum and aluminum alloys - Chemical composition
limits
GB/T 3199, Wrought aluminum and aluminum 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 3246.2, Inspection method for structure of wrought aluminum and
aluminum alloy products - Part 2: Inspection method for macrostructure
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
judgement of limiting values
GB/T 17432, Methods for sampling for analyzing the chemical composition
of wrought aluminum and aluminum alloys
GB/T 20975 (all parts), Methods for chemical analysis of aluminum and
extremely low content of impurity element.
3.1.2 Dimensions
Dimensions of round ingots shall comply with provisions of YS/T 67.
Dimensions of flat ingots shall comply with provisions of YS/T 590.
3.1.3 Marks and examples
Ingot marks shall be represented according to a sequence of product name,
reference to standard, purity level of main raw material, designation,
dimensions. Marking examples are as follows:
Example 1:
Flat ingots of which designation is Al99.99, purity level of main raw material is
4N, thickness is 420mm, width is 1620mm, length is 6000mm, are marked as
follow:
Flat ingots GB/T 33912-4NAl99.99 420×1620×6000
Example 2:
Round ingots of which designation is 1G50, purity level of main raw material is
5N, diameter is 220mm, length is 6000mm, are marked as follow:
Round ingots GB/T 33912-5N1G50 Φ220×6000
3.2 Chemical composition
3.2.1 Chemical composition of main raw material shall comply with provisions
of Table 2. Chemical composition of other raw material shall be indicated in
order sheet (or contract) after supplier and purchaser negotiate. When it is not
indicated, it shall be decided by supplier.
3.2.2 Chemical composition of ingots of which designations are Al99.99,
Al99.998, Al99.999, Al99.9995 shall comply with provisions of Table 2.
Chemical composition of ingots of which designations are 1G50, 4G60, 5G82,
6G61 shall comply with provisions of Table 3.
supplier and purchaser. Arbitration analysis shall adopt method specified in
GB/T 20975 or method agreed by supplier and purchaser.
4.1.2 Conventional chemical analysis is only carried out for elements that have
numerical regulation other than columns of “Al” and “Other” in Table 2, Table 3.
When it is suspected that mass fraction of non-conventional analysis elements
exceeds limit value of this Standard, manufacturer shall analyze these elements.
4.1.3 “Al” content is calculated by method specified in GB/T 3190. When
calculating “Al” content, take the sum of analysis values of conventional
analysis element and suspected excess unconventional analysis elements as
“Sum of element content”.
4.1.4 Determination of analysis value uses rounding-off comparison method.
Value rounding-off rules are in accordance with relevant provisions in GB/T
8170. Rounding-off digit shall be the same as limit digit specified in Table 2,
Table 3 or agreed between supplier and purchaser.
4.2 Hydrogen content
4.2.1 Testing of hydrogen content may use online liquid-state hydrogen
measurement or solid-state hydrogen measurement. In arbitration, it shall use
solid-state hydrogen measurement.
4.2.2 Liquid-state hydrogen measurement method shall be in accordance with
provisions on closed-loop method in YS/T 600-2009.
4.2.3 Solid-state hydrogen measurement method shall be in accordance with
provisions in Annex B of GB/T 33911-2017.
4.3 Slag content
Inspection method for slag content shall be determined by supplier and
purchaser after negotiation.
4.4 Size deviation
Testing method for size deviation of round ingots shall be in accordance with
method specified in YS/T 67. Testing method for size deviation of flat ingots
shall be in accordance with method specified in YS/T 590.
4.5 Macrostructure
Inspection method for macrostructure shall be in accordance with provisions of
GB/T 3246.2.
4.6 Microstructure
Inspection of grain size shall be performed according to provisions of GB/T
3246.1.
4.7 Appearance quality
Under natural scattered light, visually check appearance quality. When
necessary, it may borrow dimensional measurement tools to define defect size.
Determine defect depth by grinding.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 Ingots are inspected by supplier to ensure ingot quality complies with
provisions of this Standard and order sheet (or contract). Fill quality certificate
by supplier.
5.1.2 Purchaser shall inspect received ingots according to this Standard. When
inspection results fail to comply with provisions of this Standard and order sheet
(or contract), it shall be proposed to supplier in written form and be solved by
supplier and purchaser after negotiation. Objections to appearance quality and
size deviation shall be proposed within one month since ingots are received.
Objections to other performances shall be proposed within three months since
ingots are received. If arbitration is required, it may entrust authority recognized
by supplier and purchaser to perform. Sampling shall be conducted jointly at
purchaser’s site.
5.2 Batching
Ingots shall be submitted for acceptance in batches. Each batch shall be
composed of ingots of same furnace time (or two furnace times), of same
dimensions.
5.3 Weighing
Ingots shall be weighed out.
5.4 Inspection items
5.4.1 Each batch of ingots shall be subject to inspections of chemical
composition, size deviation and appearance quality.
5.4.2 Selectively check hydrogen content, slag content, grain size and
macrostructure.
5.5 Sampling
Only accepted products are delivered.
5.6.6 When appearance quality of any ingot fails, this ingot shall be rejected.
6 Marks, packaging, transport, storage and quality
certificate
6.1 Marks
On side and sawing upper part of ingots that are inspected as accepted, print
mark that contains following information (or stick label that contains following
information):
a) inspection seal of supplier’s quality inspection department (signature or
stamp of inspector);
b) melting sequence number, designation and dimensions;
c) product lot number or date of production.
6.2 Packaging
Ingots are not applied with oils, are not packed in case. Others are in
accordance with GB/T 3199. If oil application, casing or packing mode, method
different from GB/T 3199 is required, it shall be agreed by supplier and
purchaser and indicated in order sheet (or contract).
6.3 Transport and storage
Transport and storage of ingots shall comply with provisions of GB/T 3199.
6.4 Quality certificate
Each batch of ingots shall be attached with quality certificate, indicating:
a) supplier’s name;
b) product name and dimensions;
c) designation;
d) melting sequence number;
e) weight, number of pieces;
f) reference to this Standard;
......
 
(Above excerpt was released on 2019-07-12, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT33912-2017