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GB/T 34493-2017 English PDF (GBT34493-2017)

GB/T 34493-2017 English PDF (GBT34493-2017)

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GB/T 34493-2017: Aluminium alloys extruded rods for easy cutting

This Standard specifies the requirements, test methods, test rules and marking, packaging, transportation, storage, quality certificate and order form (or contract) contents of aluminium alloys extruded rods for easy-cutting. This Standard applies to aluminium alloys extruded rods for easy-cutting.
GB/T 34493-2017
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.150.10
H 61
Aluminium Alloys Extruded Rods for Easy-cutting
ISSUED ON: OCTOBER 14, 2017
IMPLEMENTED ON: MAY 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 method ... 9
5 Test rules ... 12
6 Marking, packaging, transportation, storage and quality certificate ... 15 7 Order form (or contract) contents ... 17
Aluminium Alloys Extruded Rods for Easy-cutting
1 Scope
This Standard specifies the requirements, test methods, test rules and marking, packaging, transportation, storage, quality certificate and order form (or contract) contents of aluminium alloys extruded rods for easy-cutting.
This Standard applies to aluminium alloys extruded rods for easy-cutting (hereinafter referred to as rods).
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
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 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
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 20975, Methods for chemical analysis of aluminium and aluminium
alloys
the rod cannot be more than two points, and the diameter of each point cannot be larger than 0.5 mm.
3.7.5 The depth of the coarse grain zone on the low-magnification sample of the rod shall not be larger than 5 mm. For rods that need to be machined, the depth of the coarse grain zone of the machined part is allowed to be larger than 5 mm; however, it shall not be larger than the machining allowance.
3.7.6 The oxide film on the low-magnification sample of the rod shall comply with the requirements of Table 8.
Table 8 -- Oxide film requirements
Name of the
defect Area under test
Oxide film requirements of single-point lengths in
the following ranges
??? 0.3 mm > 0.3 mm ~ 2.0 mm > 2.0 mm
Oxide film The tested surface
Allowed to
exist ??? 4 points
Not allowed
to exist
3.8 Microstructure
The microstructure of the rod is not allowed to be overburnt.
3.9 Appearance quality
3.9.1 Cracks, bubbles or corrosive spots are not permitted on the surface of the rod.
3.9.2 Peeling on the surface of the rod, if any, shall be removed; however, the diameter of the rod after removal must not exceed the allowable deviation of the diameter.
3.9.3 Defects such as bruises, scratches, abrasions and indentations, of which the depth exceed the diameter deviation, AND straightening marks which are caused by straightening, are not allowed on the surface of the rod; however, the diameter of the rod, after the depth of the defect is deducted, must not exceed the allowable range of the diameter.
4 Test method
4.1 Chemical composition
4.1.1 The analysis method of chemical composition shall comply with
requirements of GB/T 20975 or GB/T 7999; the arbitration analysis shall adopt the methods which are specified in GB/T 20975.
4.1.2 Perform routine chemical analysis only on the numerically specified elements other than those in the columns of the ?€?Al?€? and ?€?Other?€? of
The test method of the shear performance of the rod is carried out in
accordance with the provisions of GB/T 34487.
4.6 Low-magnification organization
The test method of the low-magnification organization of the rod is carried out in accordance with the provisions of GB/T 3246.2.
4.7 Microstructure
The test method of the microstructure of the rod is carried out in accordance with the provisions of GB/T 3246.1.
4.8 Appearance quality
Visually inspect the appearance quality under natural scattered light. If necessary, use dimensional measurement tools to define the defect size; determine the defect depth by grinding.
5 Test rules
5.1 Inspection and acceptance
5.1.1 The product shall be inspected by the supplier to ensure that the product quality complies with the requirements of this Standard and the order form (or the contract); the supplier shall fill in the quality certificate.
5.1.2 The buyer shall inspect the received products in accordance with the provisions of this Standard. If the test result is inconsistent with the provisions of this Standard and the order form (or the contract), a written form shall be submitted to the supplier; the issue shall be settled by negotiation between the supplier and the buyer. 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 by the buyer.
5.2 Batch
Products shall be submitted for acceptance in batches. Each batch shall consist of products of the same grade, status and dimensions; the weight of each batch is not limited.
5.3 Weight
The product shall be weighed on the scales.
5.4 Inspection items
5.4.1 Each batch of products, before being delivered, shall be tested for chemical composition, dimensional deviation, tensile mechanical properties at room temperature, low-magnification organization and appearance quality. 5.4.2 Each batch of off-quenched rods shall be inspected for microstructure. 5.4.3 The machinability of the product is guaranteed by the supplier process. When the buyer indicates the inspection in the order form (or contract), the machinability test shall be carried out.
5.4.4 The shear performance of the product is guaranteed by the supplier process. When the buyer indicates the inspection in the order form (or contract), the shear performance test shall be carried out.
5.5 Sampling
The sampling of the product shall comply with the requirements of Table 9. Table 9 -- Sampling regulations
Inspection items Sampling regulations
Required
article
number
Article
number of
the test
method
Chemical
composition
Perform according to the provisions of
GB/T 17432 3.2 4.1
Dimensional
deviation Test one by one 3.3 4.2
Tensile mechanical
properties at room
temperature a
The sampling amount is as specified
in Table 10. Cut one sample at the
extrusion front end of each rod; other
requirements are in accordance with
GB/T 16865
3.4 4.3
Machinability
When inspection is indicated in the
order form (or contract), take 1 rod
and cut 1 sample on the selected rod.
3.5 4.4
Shear performance
When inspection is indicated in the
order form (or contract), take 5 rods
and cut 1 sample on each selected
rod.
3.6 4.5
Low-magnification
organization
The sampling amount is as specified
in Table 10. Cut one sample at the
extrusion end of each selected rod
3.7 4.6
Microstructure a Take 2 rods from each batch (or heat treatment furnace); cut 1 sample on 3.8 4.7 test, then, judge the batch of products to be unqualified.
5.6.5 When the shear performance of any of the samples is unqualified, take double the number of samples from the batch (or heat treatment furnace) of products to perform repeated tests. If all the repeated test results are qualified, judge the batch of products to be all qualified. If the result of sample properties is still unsatisfactory in the repeated test, then, judge the batch (or heat treatment furnace) of products to be unqualified.
5.6.6 When the low-magnification organization of any sample is unqualified, judge as follows:
a) If it is unqualified because of metallurgical defects such as cracks, pores, bright grains, non-metallic inclusions, foreign metal inclusions, white spots, primary crystals, grain size and oxide film, judge the batch of products to be unqualified.
b) If it is unqualified because of shrinkage, layering and coarse grain zone, it is allowed to cut a portion from the extrusion end of the product for
repeated test until it is qualified; then, other products of the batch shall be tailed according to the maximum length of the above defect distribution OR inspected one by one; deliver the qualified ones.
5.6.7 When the microstructure of any sample is unqualified, if the heat treatment number of the product can be distinguished, judge the heat number that is represented by the sample as unqualified; inspect other heat numbers in turn, and deliver the qualified ones. If the heat number cannot be distinguished, judge the batch as unqualified.
5.6.8 When the appearance quality of any product is unqualified, judge the root product to be unqualified.
6 Marking, packaging, transportation, storage and
quality certificate
6.1 Marking
6.1.1 Product marking
6.1.1.1 The extrusion front end of the qualified rod shall be printed with the markings of the following contents (or be attached with labels of the following contents):
a) the inspection stamp of the supplier's quality inspection department (or the signature or stamp of the quality inspection personnel);
b) grade, status and dimensions;
c) product batch number or date of manufacture.
6.1.1.2 The ?€?W?€? mark (or label) shall be attached to the extrusion end of the qualified rod.
6.1.2 Package marking
The package marking of the product shall comply with the provisions of GB/T 3199.
6.2 Packaging
Rods are not oiled. Rods with the diameter of less than 50.00 mm shall be packed in a packaging box that is lined with packaging materials; the weight of each box shall not exceed 1 000 kg. Other rods shall be bundled in bare parts. When oiling is required or when the user has other special requirements for the packaging, it shall be marked on the order form (or contract). Other
requirements shall comply with the provisions of GB/T 3199.
6.3 Transportation and storage
The transportation and storage of the rods shall comply with the provisions of GB/T 3199.
6.4 Quality certificate
Each batch of products shall be accompanied by a product quality certificate, which indicates:
a) the name of the supplier;
b) product name:
c) grade, status, dimensions;
d) product batch number or date of manufacture;
e) net weight or number of pieces;
f) various of analysis and test results;
g) the inspection stamp of the supplier's quality inspection department; h) code of this Standard;
i) Date of packaging (or date of manufacture).

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