GB/T 38470-2019 English PDF (GB/T38470-2019)

GB/T 38470-2019: Recycling materials for brass
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GB/T 38470-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.30
H 62
Recycling materials for brass
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Classification ... 7 
5 Technical requirements ... 7 
6 Test methods ... 11 
7 Inspection rules ... 14 
8 Marking, packaging, transportation, storage and quality certificate ... 16 
9 Order form (or contract) content ... 17 
Appendix A (Informative) Typical photos of recycling materials for brass ... 18 
Appendix B (Informative) Inspection methods of radioactive contaminants ... 22 
Appendix C (Normative) Testing method of moisture content ... 28 
Appendix D (Normative) Preparation of chemical composition sample and
testing method of metal recycling rate ... 30 
Appendix E (Informative) Inspection process of recycling materials for brass 32 
Bibliography ... 33 
Recycling materials for brass
1 Scope
This Standard specifies the classification, technical requirements, test methods,
inspection rules, marking, packaging, transportation, storage, quality certificate
and order form (or contract) content of recycling materials for brass (hereinafter
referred to as materials).
This Standard applies to brass materials and their recycling and domestic and
foreign trade in the field of circulation.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 5121 (all parts) Methods for chemical analysis of copper and copper
alloys
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
YS/T 482 Methods for analysis of copper and copper alloys - The atomic
emission spectrometry
YS/T 483 Methods for analysis of copper and copper alloys - X-Ray
fluorescence spectrometric (wavelength dispersive)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Recycling materials for brass
material is 0.5 kg; the mass of moisture is 0.2 kg; the mass of non-copper metals
such as aluminum and iron is 2 kg; the mass of copper and copper alloy is 97.3 kg;
then the metal brass content is 97.3%.
3.7
Total metal content
The amount of metal (including metal brass and non-copper metal) per unit
mass of representative sample after removal of foreign material and moisture,
expressed as a percentage.
Note: For example, extract 100 kg of representative sample; of which, the mass of foreign
material is 0.5 kg; the mass of moisture is 0.2 kg; the mass of non-copper metals
such as aluminum and iron is 2 kg; the mass of copper and copper alloy is 97.3 kg;
then the total metal content is 99.3%.
3.8
Coating material
The material coated on the surface of the materials.
Note: Coating material generally includes identification paint, anti-rust paint, insulating
layer, etc.
3.9
Plating material
The material plated on the surface of the materials.
Note: Plating material generally includes nickel, tin, zinc, aluminum, chromium, etc.
3.10
Chemical composition sample
The sample which is directly extracted from the materials or prepared after
melting for detecting the content of copper and other elements.
3.11
Metal recycling rate
The ratio OF the mass of the ingot, obtained after pretreatment, melting and
solidification of a unit mass of representative sample, TO the mass of the
original representative sample, expressed as a percentage.
The inspection of metal recycling rate of the materials shall be carried out in
accordance with Appendix D.
6.8 Other requirements
Other requirements of the materials are inspected by sensory organs.
7 Inspection rules
7.1 Inspection process
Refer to Appendix E for the inspection process of the materials.
7.2 Inspection and acceptance
The purchaser shall inspect the received materials in accordance with the
provisions of this Standard. If the inspection result is not in conformity with the
provisions of this Standard and the order form (or contract), it shall be submitted
to the supplier in written form; the supplier and the purchaser shall negotiate
and resolve. If arbitration is required, it shall be negotiated between the supplier
and the purchaser.
7.3 Lot grouping
The materials shall, in lots, be submitted for acceptance. Each lot shall be
composed of the materials with the same name or code. The lot weight shall
not exceed 50 t.
7.4 Inspection items
The apparent characteristics, radioactive contaminants, foreign material
content, moisture content, total metal content, and metal brass content of each
lot of the materials shall be inspected. When necessary, the chemical
composition and metal recycling rate shall also be inspected.
7.5 Sampling
The sampling of the materials shall meet the requirements of Table 5.
materials does not meet the requirements of this Standard.
8 Marking, packaging, transportation, storage and
quality certificate
8.1 Marking
Each lot of the materials shall be accompanied by a label indicating:
a) Supplier name;
b) Material name;
c) Material code;
d) Lot number;
e) Total weight;
f) Net weight;
g) Number of this Standard;
h) Others.
8.2 Packaging
The materials can be packaged in bulk, packaged, or pressed, etc. The
packaging method, size and mass shall be negotiated and determined by both
the supplier and the purchaser.
8.3 Transportation and storage
8.3.1 During transportation, different categories of bulk materials shall not be
mixed.
8.3.2 The transportation and storage of the materials shall be protected from
rain and snow.
8.4 Quality certificate
Each lot of the materials shall be accompanied by a quality certificate, which
indicates:
a) Supplier name;
Appendix B
(Informative)
Inspection methods of radioactive contaminants
B.1 Inspection instrument
The inspection instrument shall meet the requirements of GB 18871, GB/T
12162.3 and GB/T 5202.
B.2 Measurement of external irradiation penetrating radiation dose rate
B.2.1 Measurement of natural environmental radiation background value
B.2.1.1 Before the measurement of external irradiation penetrating radiation
dose rate, the local natural environmental radiation background value shall be
measured and determined first.
B.2.1.2 Choose 3~5 points (which can be used as fixed survey points) on the
flat open ground, which can represent the local normal natural radiation
background state and have no radioactive contamination, as the measuring
points.
B.2.1.3 PLACE the measuring probe of the measuring instrument at a height of
1 m from the ground above the measuring point; determine its external
irradiation penetrating radiation dose rate. The measured value is read once
every 10 s. The average of the 10 readings is taken as the measured value at
this point. USE the arithmetic mean of the measured values of each measuring
point as the average of normal natural radiation.
B.2.2 Tour testing
B.2.2.1 Before the materials pass through the port channel, they shall be
subjected to the tour testing of radioactive contamination. During the tour
testing, the measuring instrument shall be as close as possible to the surface
of the measured object or the surface of the container, car body, warehouse
body, etc. loaded with the materials. The peripheral surface of the measured
object shall be tour-tested.
B.2.2.2 During the tour testing, when it is found that the radioactivity has
obviously exceeded the management limits of three detection indicators, it is
judged as nonconformity. When the radioactive contamination has been found
to exceed the management limits of three detection indicators, no sub-
Dሶ - The corrected measured value of the measuring instrument, in microGy per
hour (μGy/h);
K1 - The scale factor of measuring instrument (given by the instrument's
verification certificate);
Kη - The efficiency factor of measuring instrument; Dሶ c - The measured value reading of measuring instrument, in microGy per hour
(μGy/h).
B.3 Inspection of α, β surface contamination
B.3.1 Testing requirements
In general, the tour testing and point measurement of α and β surface
contamination level shall be carried out at the same time as the measurement
of external irradiation penetrating radiation dose rate. If necessary, the tour
testing and point measurement of this item can also be carried out separately.
B.3.2 Arrangement of test points
For the detection of α and β surface contamination levels, the test points shall
be arranged in accordance with B.2.3. The measurement area shall be greater
than 300 cm2.
B.3.3 Efficiency determination of α surface contamination meter
B.3.3.1 USE α surface contamination meter to measure the count N0,α of the
natural environmental radiation background 10 min.
B.3.3.2 Measure the check source of the instrument for 5 min and obtain the
count N1,α.
B.3.3.3 Reverse the instrument probe by 180° and measure it for 5 min, to
obtain the count N2,α of the check source (considering the unevenness of the
plane source).
B.3.3.4 According to formula (B.3), calculate the efficiency factor η4π(α) of the
instrument.
Where:
η4π(α) - The efficiency factor of α surface radiation contamination meter;
Appendix C
(Normative)
Testing method of moisture content
C.1 Scope
This appendix specifies the testing method for the moisture content of the
materials.
This appendix applies to the testing of the moisture content of the materials.
C.2 Method summary
USE alcohol and clear water to clean the sample; HEAT to a fixed temperature
and keep to a constant weight. The mass loss is measured, to calculate the
moisture content.
C.3 Reagents or materials
C.3.1 Industrial alcohol; the mass fraction of ethanol is not less than 95%.
C.3.2 Water: Grade 2 water specified in GB/T 6682.
C.4 Apparatus
C.4.1 Drying oven: The temperature control range is 105 °C±5 °C.
C.4.2 Drying disc.
C.4.3 Electronic scale: The accuracy is 0.01 g.
C.5 Sampling
In each inspection lot, take 2 representative samples of the materials. The mass
of each representative sample is not less than 1.0 kg.
C.6 Test procedure
C.6.1 After the drying disc has a constant weight at 105 °C, it is placed in a
drying oven and cooled to room temperature. The mass is weighed and
recorded as m6.
C.6.2 PUT the representative sample into the drying disc and spread it flat;
WEIGH the mass of the drying disc with the sample and record it as m7.
Appendix D
(Normative)
Preparation of chemical composition sample and testing method of
metal recycling rate
D.1 Scope
This appendix specifies the preparation method of chemical composition
sample and the testing method of material metal recycling rate.
This appendix applies to the preparation of chemical composition sample and
testing of metal recycling rate.
D.2 Method summary
TAKE representative samples of the materials; after pretreatment, put them into
the melting furnace; fully melt and clear the slag; prepare chemical composition
samples. After the melt is solidified, the ratio of the mass of the obtained ingot
to the mass of the sample is the metal recycling rate.
D.3 Reagents or materials
Melting covering agents and slag cleaning agents (such as charcoal, salt, borax,
etc.).
D.4 Apparatus
D.4.1 Melting electric furnace.
D.4.2 Crucible; preferably a graphite crucible.
D.4.3 Mold.
D.4.4 Electronic scale: Accuracy is 0.01 kg.
D.5 Test procedure
D.5.1 Sampling
In each inspection lot, take representative samples. The mass is not less than
10 kg.
D.5.2 Weighing
GB/T 38470-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.30
H 62
Recycling materials for brass
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Classification ... 7 
5 Technical requirements ... 7 
6 Test methods ... 11 
7 Inspection rules ... 14 
8 Marking, packaging, transportation, storage and quality certificate ... 16 
9 Order form (or contract) content ... 17 
Appendix A (Informative) Typical photos of recycling materials for brass ... 18 
Appendix B (Informative) Inspection methods of radioactive contaminants ... 22 
Appendix C (Normative) Testing method of moisture content ... 28 
Appendix D (Normative) Preparation of chemical composition sample and
testing method of metal recycling rate ... 30 
Appendix E (Informative) Inspection process of recycling materials for brass 32 
Bibliography ... 33 
Recycling materials for brass
1 Scope
This Standard specifies the classification, technical requirements, test methods,
inspection rules, marking, packaging, transportation, storage, quality certificate
and order form (or contract) content of recycling materials for brass (hereinafter
referred to as materials).
This Standard applies to brass materials and their recycling and domestic and
foreign trade in the field of circulation.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition