GB/T 5155-2022 PDF in English
GB/T 5155-2022 (GB/T5155-2022, GBT 5155-2022, GBT5155-2022)
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Magnesium and magnesium alloy extruded rods
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GB/T 5155-2022: PDF in English (GBT 5155-2022) GB/T 5155-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.20
CCS H 61
Replacing GB/T 5155-2013
Magnesium and magnesium alloy extruded rods
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 6
4 Categories ... 6
5 Quality assurance ... 7
6 Requirements ... 7
7 Test methods ... 13
8 Inspection rules ... 16
9 Marking, packaging, transportation, storage, quality certificate ... 18
10 Contents of purchase order (or contract) ... 19
Appendix A (Informative) Comparison of new and old designations and states ... 21
References ... 22
Magnesium and magnesium alloy extruded rods
1 Scope
This document specifies the classification, quality assurance, requirements, test
methods, inspection rules and markings, packaging, transportation, storage, quality
certificates, purchase orders (or contracts) of magnesium and magnesium alloy
extruded rods.
This document applies to magnesium and magnesium alloy extruded round rods, square
rods, hexagonal rods (hereinafter referred to as rods).
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 3499 Magnesium ingots
GB/T 4297 Inspection method for macrostructure of wrought magnesium alloy
products
GB/T 5153 Designation and composition of wrought magnesium and magnesium
alloys
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 13748 (all parts) Chemical analysis methods of magnesium and magnesium
alloys
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 32792 Packing, marking, transporting and storing of magnesium alloy
wrought products
purchaser; meanwhile it shall be indicated in the purchase order (or contract).
6.4.2 There shall be no cracks, fractures, blisters, shrinkage tails, inclusions, bright rings,
large grains, on the macrostructure test piece, that would damage the continuity of the
metal.
6.4.3 There may be layers on the macrostructure test piece, which has a depth not
exceeding half of the margin of diameter deviation. If the buyer requires no layers, it
should be indicated in the purchase order (or contract).
6.4.4 The ZK61M alloy rod shall be inspected for the coarse-grained ring; the depth of
the coarse-grained ring shall not be greater than 5 mm.
6.5 Appearance quality
6.5.1 The surface of the rod shall be clean. There shall be neither cracks, scars, corrosion
spots, that cannot be removed by inspection and grinding, nor various pressed objects
and concentrated bright circles reflecting the internal cracks of the rod. For the defects,
such as cracks, scars, corrosion spots, that can be removed by grinding, they shall be
polished and trimmed before oxidation and coloring; however, the depth of trimming
shall not be greater than the maximum allowable deviation of the rod diameter;
sandpaper should be used for polishing after trimming. Cracks shall not be ground.
6.5.2 The surface of the rod shall not have defects, such as crushing, bumping, cratering,
air bubbles, blisters, abrasions, scratches, that affect the user's use; the depth of the
defects shall not exceed the allowable negative deviation of the diameter. For rods,
which have a diameter of less than 160 mm, the depth of the extrusion marks shall not
exceed 0.1 mm; for rods, which have a diameter of not less than 160 mm, the depth of
the extrusion marks shall not exceed 0.3 mm.
6.5.3 The surface of the rod should be oxidized; its oxide layer shall be intact, without
exposing the base metal or falling off. If the oxidation treatment is not carried out, other
anti-corrosion protection measures for the rod shall be determined, through negotiation
between the supplier and the buyer; meanwhile it shall be specified in the purchase
order (or contract).
7 Test methods
7.1 Chemical composition
7.1.1 For the chemical composition analysis and arbitration of other alloy rods, except
for LA93Z, LZ91N, LA93M, it shall be carried out according to the methods, which
are specified in GB/T 13748 (all parts).
7.1.2 For the chemical composition analysis and arbitration of LA93Z, LZ91N, LA93M
alloy rods, except for Li element, it shall be carried out according to the method, which
7.3 Mechanical properties
The mechanical property test of the rod is inspected, according to the method specified
in GB/T 16865.
7.4 Macrostructure
The macrostructure inspection of the rod is carried out, according to the method
specified in GB/T 4297.
7.5 Appearance quality
The appearance quality of the rods is visually inspected. When the depth of the defect
cannot be determined, the grinding method can be used for measurement.
8 Inspection rules
8.1 Inspection and acceptance
8.1.1 The rod shall be inspected by the supplier, to ensure that the product quality
conforms to the provisions of this document and the purchase order (or contract);
meanwhile it shall fill the quality certificate.
8.1.2 The purchaser shall inspect the received products, according to the provisions of
this document. If the inspection results are inconsistent with the provisions of this
document and the purchase order (or contract), it shall be submitted to the supplier in
writing, to be resolved through negotiation between the supplier and the buyer. For the
objection, which belongs to the appearance quality and size deviation, it shall be raised,
within one month from the date of receipt of the product. For the objection, which
belongs to other properties, it shall be raised, within three months from the date of
receipt of the product. If arbitration is required, both the supplier and the buyer shall
jointly conduct arbitration sampling on the buyer side.
8.2 Group-batching
Rods shall be submitted for acceptance in batches. Each batch shall consist of the same
alloy designation, state, specification. The batch weight is not limited.
8.3 Inspection items
Each batch of rods shall be subject to exit-factory inspection. The inspection items shall
include inspection of chemical composition, dimensional deviation, tensile mechanical
properties at room temperature, macrostructure, appearance quality.
8.4 Sampling
Sampling of rods shall comply with the provisions of Table 9.
the above defects occur; it shall be judged one by one.
8.5.5 When the appearance quality of any rod is unqualified, the rod is judged to be
unqualified.
9 Marking, packaging, transportation, storage, quality
certificate
9.1 Marking
9.1.1 The following imprints (or signs with the following imprints) shall be printed, on
the front end of the accepted rods.
a) Inspection seal by the quality inspection department of the supplier;
b) Alloy designation;
c) Delivery state;
d) Batch number.
9.1.2 For the rod, which has a diameter of not less than 40 mm, it shall be printed on
the front end. For the rod, which has a diameter of less than 40 mm, it shall hang two
labels at the front end of the rod, per batch (or per box).
9.1.3 For rods, which have a diameter of not less than 20 mm AND have passed the
acceptance inspection, the extruded end shall be marked with the letter "W".
9.1.4 The packaging box marking of rods shall be implemented, in accordance with the
provisions of GB/T 32792.
9.2 Packaging, transport, storage
9.2.1 Rods should be greased and packaged. If there are special requirements, they shall
be determined, through negotiation between the supplier and the buyer; meanwhile it
shall be indicated in the purchase order (or contract).
9.2.2 Other requirements for the packaging, transportation, storage of bars shall be
implemented, in accordance with the provisions of GB/T 32792.
9.3 Quality certificate
Each batch of bars shall be accompanied by a product quality certificate, which states:
a) The supplier name;
b) The product name;
c) The designation;
d) The state;
e) Dimensions;
f) Product batch number;
g) Net weight and number of pieces;
h) The results of each analytical inspection;
i) Inspection seal by the quality inspection department of the supplier;
j) The document number;
k) Packaging date (or exit-factory date).
10 Contents of purchase order (or contract)
A purchase order (or contract) for the products, which are listed in this document, shall
include the following:
a) Product name;
b) Designation;
c) State;
d) Dimensions;
e) Weight (or number of pieces);
f) The special requirements of the buyer:
- Special requirements for diameter deviation;
- Special requirements for curvature;
- Special requirements for twisting degree;
- Special requirements for chamfer radius;
- Special requirements for tensile mechanical properties at room temperature;
- Special requirements for appearance quality;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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