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GB/T 40123-2021 English PDF (GBT40123-2021)

GB/T 40123-2021 English PDF (GBT40123-2021)

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GB/T 40123-2021: Aluminium and aluminium alloy billet with high purity and fine grain

This Standard specifies product classification, quality assurance, technical requirements, test methods, inspection rules, marks, packaging, transportation, storage, quality certificates and purchase order (or contract) content for aluminium and aluminium alloy billet with high purity and fine grain. This Standard is applicable to aluminium and aluminium alloy (except 4?????? aluminum alloy) solid billet with high purity and fine grain (hereinafter referred to as the billet), which are used for 3C electronic high-quality surface materials, automotive high-performance forged wheels, porous micro-channel flat tubes.
GB/T 40123-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Aluminium and aluminium alloy billet with high purity
and fine grain
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
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 Quality assurance ... 6
6 Technical requirements ... 6
7 Test methods ... 10
8 Inspection rules ... 12
9 Marks, packaging, transportation, storage, quality certificate ... 15 10 Purchase order (or contract) content ... 16
Annex A (informative) Product quality assurance ... 17
Annex B (normative) Test method for segregation layer thickness ... 21 Annex C (normative) Test method for unmelted phase area percentage ... 23 Annex D (normative) Test method for phase transformation rate of 6??????
aluminum alloy billet ... 25
Bibliography ... 28
Aluminium and aluminium alloy billet with high purity
and fine grain
1 Scope
This Standard specifies product classification, quality assurance, technical requirements, test methods, inspection rules, marks, packaging, transportation, storage, quality certificates and purchase order (or contract) content for aluminium and aluminium alloy billet with high purity and fine grain.
This Standard is applicable to aluminium and aluminium alloy (except 4?????? aluminum alloy) solid billet with high purity and fine grain (hereinafter referred to as the billet), which are used for 3C electronic high-quality surface materials, automotive high-performance forged wheels, porous micro-channel flat tubes. 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 aluminium and aluminium alloys - Chemical
composition limits
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 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 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 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 aluminium and
aluminium alloys
GB/T 26492.1, Defects for wrought aluminium and aluminium alloys ingots and products - Part 1: Defects for ingots
GB/T 32186, Test methods of cleanliness of aluminium and aluminium alloy ingots
YS/T 67, Wrought aluminium and aluminium alloy columniform ingots
YS/T 600, Analysis method of hydrogen in liquid aluminium and aluminium alloys the method of the closed gas loop circulation
YS/T 874-2013, Ultrasonic inspection of wrought aluminium alloy
columniform ingots by the water immersion method
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 8005.1, GB/T 26492.1 apply.
4 Product classification
4.1 Product designation, state and size specifications
The designation, state and size specifications of the billet shall comply with YS/T 67. When there are special requirements, the supplier and the purchaser shall negotiate and indicate in the purchase order (or contract).
4.2 Marking and example
The marking of the billet is indicated in the order of product name, number and sequence number of this Standard, designation, state (when it is cast state, it shall not be marked), and size specifications. A marking example is as follow: The homogenized billet, of which the designation is 6061, the diameter is 254mm, the length is 6000mm, is marked as:
Billet GB/T 40123-6061 homogenization-??254??6000
7.3 Purity
7.3.1 Hydrogen content
The measurement of liquid hydrogen shall comply with the method specified in YS/T 600.
7.3.2 Slag content
The off-line slag measurement shall comply with the method specified in GB/T 32186.
7.4 Macrostructure
The determination of macrostructure shall comply with the method specified in GB/T 3246.2.
7.5 Microstructure
7.5.1 Over-burning
The determination of over-burning shall comply with the method specified in GB/T 3246.1.
7.5.2 Non-metallic inclusions
The determination of non-metallic inclusions shall comply with the method specified in GB/T 3246.1. Conduct grinding and mechanical polishing of the specimen. After polishing, the specimen is rinsed with alcohol and then blown dry. Under a metallurgical microscope, use 200 times magnification to scan the inspection surface of the specimen. Use 500 times magnification to judge the observed non-metallic inclusions. Use 200 times magnification to measure the size of the confirmed non-metallic inclusions.
7.5.3 Segregation layer thickness
The thickness detection of the segregation layer shall comply with the method specified in Annex B.
7.5.4 Grain size
The determination of grain size shall comply with the method specified in GB/T 3246.1.
7.5.5 Dendrite spacing
7.5.5.1 Specimen preparation and erosion determination shall comply with the methods specified in GB/T 3246.1. Under the metallographic microscope, use 100 times magnification to observe the etched sample. The specimen shall show clear dendrites under a metallurgical microscope. Otherwise, the sample shall be re-prepared until it shows clear dendrites.
7.5.5.2 The measurement of the dendrite spacing of the etched specimen shall comply with the intercept method specified in GB/T 3246.1. For the
measurement of dendrite spacing, no less than 50 dendrite spacings shall be selected.
7.5.5.3 Calculate the ratio of the maximum spacing of the measured dendrites to the average spacing.
7.5.6 Percentage of unmelted phase area
The percentage of unmelted phase area shall be determined according to the method specified in Annex C.
7.5.7 Phase conversion rate
The phase inversion rate shall be determined according to the method specified in Annex D.
7.6 Ultrasonic flaw detection
Ultrasonic flaw detection shall comply with the method specified in YS/T 874- 2013.
7.7 Appearance quality
Under natural scattered light, visually inspect the appearance quality of the billet. When necessary, size measuring tools can be used to determine the size of the defect. Determine the depth of defects by grinding.
8 Inspection rules
8.1 Inspection and acceptance
8.1.1 The billet shall be inspected by the supplier to ensure that the quality of the billet meets the requirements of this Standard and the purchase order (or contract). Fill in the quality certificate.
8.1.2 The purchaser shall inspect the billet received in accordance with the provisions of this Standard. If the inspection result does not conform to the provisions of this Standard and the purchase order (or contract), it shall be submitted to the supplier in written form, and the supplier and the purchaser shall negotiate and resolve it. Objections that belong to the appearance quality and size deviation shall be raised within one month from the date of receipt of the billet. Objections pertaining to organization and performance shall be raised for other heats. Only the qualified ones shall be delivered. If the heat cannot be distinguished, the billets of this batch are unqualified.
8.6.7 When the ultrasonic flaw detection of any billet is unqualified, determine that the billet is unqualified. Inspect the other billets one by one. Only the qualified ones shall be delivered.
8.6.8 When the appearance quality of any billet is unqualified, the billet is judged to be unqualified. Inspect the other billets one by one. Only the qualified ones shall be delivered.
9 Marks, packaging, transportation, storage, quality
certificate
9.1 Marks
9.1.1 Product mark
The qualified billet shall include the following identification (or paste the label containing the following content):
a) Product name;
b) Lot number, melting number, casting number, root number;
c) Designation, state, size specification;
d) Inspection seal of the supplier's quality supervision department;
e) Bar code (when required);
f) Reference to this Standard.
9.1.2 Packaging marks
It shall be in accordance with GB/T 3199.
9.2 Packaging, transportation, storage
The billets are packaged as bare parts. Transportation and storage shall be carried out in accordance with the regulations of GB/T 3199.
Other packaging, transportation, and storage methods can be negotiated
between the supplier and the purchaser and specified in the purchaser order (or contract).
9.3 Quality certificate
Each batch of billets shall be accompanied by a product quality certificate, which shall include the following:
a) Supplier?€?s name, address;
b) Product name;
c) Designation, state, size specification;
d) Lot number, melting number, casting number;
e) Weight (gross weight, net weight);
f) Exit-factory inspection results of each analysis item and the inspection seal of the supplier's quality supervision department;
g) Packing date (or exit-factory date);
h) Reference to this Standard.
10 Purchase order (or contract) content
The purchaser order (or contract) for the products listed in this Standard shall include the following:
a) Product name;
b) Designation, state and size specifications;
c) Weight;
d) Requirements for hydrogen content;
e) Requirements for slag content;
f) Requirements for macrostructures;
g) Microstructure requirements;
h) Packaging requirements;
i) Other special requirements;
j) Reference to this Standard.

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