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GB/T 13247-2019 PDF in English


GB/T 13247-2019 (GB/T13247-2019, GBT 13247-2019, GBT13247-2019)
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GB/T 13247-2019: PDF in English (GBT 13247-2019)

GB/T 13247-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.100
H 42
Replacing GB/T 13247-1991
Methods for Sampling and Testing the Grain Size of
Ferroalloys Products
(ISO 4551:1987, Ferroalloys - Sampling and Sieve Analysis, MOD)
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative References ... 6
3 Equipment and Tools ... 7
3.1 Forklift or Crane ... 7
3.2 Unpacking Tools ... 7
3.3 Sampling Shovel ... 7
3.4 Sampling Drill ... 7
3.5 Measuring Scales ... 8
3.6 Ruler or Tape Measure ... 8
3.7 Test Sieve ... 8
3.8 Vibrating Sieving Machine ... 9
4 Specimen Composition ... 9
4.1 Directly Formation of Bulk Sample ... 9
4.2 Formation of Bulk Sample from Subsample... 9
5 Sampling ... 10
5.1 Sampling Shovel ... 10
5.2 Sampling Drill ... 12
5.3 Manual Selection Method ... 13
5.4 Whole Package ... 13
6 Reduction ... 14
7 Grain Size Testing ... 14
8 Test Results and Expression ... 16
8.1 Calculation of Excessively Large Grain Size ... 16
8.2 Calculation of Excessively Small Grain Size ... 16
8.3 Calculation of Comprehensive Grain Size ... 16
8.4 Determination and Expression of Grain Size Test Results ... 17
9 Handling of Objections to Screening Results ... 17
10 Inspection Report ... 17
Appendix A (informative) Comparison of Chapter No. between This Standard and ISO
4551:1987 ... 19
Appendix B (informative) Technical Differences between This Standard and ISO
4551:1987, and the Causes for These Differences ... 20
Appendix C (informative) Comprehensive Accuracy of the Determination of Ferroalloy
Grain Size ... 21
Appendix D (informative) Relational Graph of the Rated Maximum Grain Size and the
Minimum Increment Size of Ferroalloys ... 23
Methods for Sampling and Testing the Grain Size of
Ferroalloys Products
WARNING---personnel using this Standard shall have practical experience in formal
sampling and grain size testing. When conducting screening tests, safety protection and
dust-proof supplies, such as: goggles and dust masks, must be worn to avoid injuries
caused by particle splash or dust.
1 Scope
This Standard specifies the equipment and tools, specimen composition, sampling, reduction,
grain size testing, test results and expression, handling of objections to screening results and
inspection report for grain size inspection of ferroalloy products.
This Standard is applicable to the sampling and testing during grain size acceptance and
arbitration of ferroalloy products.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 4010 Ferroalloys Sampling and Preparation of Samples for Chemical Analysis (GB/T
4010-2015, ISO 4552:1987, MOD)
GB/T 6003.1 Test Sieves - Technical Requirements and Testing - Part 1: Test Sieves of Metal
Wire Cloth (GB/T 6003.1-2012, ISO 3310-1:2000, MOD)
GB/T 6003.2 Test Sieves - Technical Requirements and Testing - Part 2: Test Sieves of Metal
Wire Cloth (GB/T 6003.2-2012, ISO 3310-2:1999, MOD)
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of
Limiting Values
GB/T 28369 Ferroalloys - Experimental Methods for the Evaluation of the Quality Variation
and Methods for Checking the Precision of Sampling (GB/T 28369-2012, ISO 7087:1984,
MOD)
other specifications, use square hole test sieves.
7.5 The testing and screening operation of the grain size of ferroalloys is generally carried out
from the largest sieve hole to the smallest sieve hole. The oversize material (excessively large
grain size) with the largest sieve hole and the undersize material (excessively small grain size)
with the smallest sieve hole will be respectively weighed.
7.6 During manual screening, the height of the broken bag shall not exceed 300 mm from the
ground. If a drainage plate is used, the landing point between the broken packaging bag and the
drainage plate shall not be greater than 300 mm, and the included angle between the drainage
plate and the sieve mesh shall not be greater than 45. A fork or other tools may be used first to
separate the parts that are significantly larger than the lower screening limit, then, sieve the
parts that cannot be separated. The ferroalloy added for each screening shall ensure that the
oversize ferroalloy can fully contact the screen surface during the screening operation. Shake
the screen back and forth, the moving distance is about one arm length (about 300 mm), and
reciprocate once every 1 s ~ 2 s. The amount of feed for each screening and the number of
reciprocating screenings shall comply with the stipulations of Table 8.
7.7 During mechanical screening, check that the sieve holes of the vibrating sieving machine
are not blocked. Adjust the amplitude and frequency of the vibrating sieving machine to be
basically the same as manual screening. Use a forklift or hoisting method to lift the sample to
be screen to the feed inlet o the vibrating sieving machine; use a tool to cut the bottom of the
package, and the drop point between the broken packaging bag and the drainage plate of the
vibrating sieving machine shall not be greater than 300 mm, and the included angle between
the drainage plate and the sieve mesh shall not be greater than 45. The materials shall be fed
at a constant speed, so that all samples in the package can pass through the vibration sieving
machine.
7.8 Due to the difference brittleness of various ferroalloys, they cannot become regular-shaped
particles (blocks) when broken. After screening, the oversize product (excessively large grain
size) with the largest sieve hole can be manually sorted. The side length of the ferroalloy
particles in one direction does not exceed 1.5 times the maximum limit value. Change its
direction or position, and the ferroalloy particles that smoothly pass through the sieve holes are
the undersize material with the largest sieve hole.
m1---the mass of excessively large grain size, expressed in (kg);
m2---the mass of excessively small grain size, expressed in (kg);
m---the total mass of the specimen for grain size testing, expressed in (kg).
8.4 Determination and Expression of Grain Size Test Results
8.4.1 The grain size test of a delivery batch shall be based on the screening test results of one
random sampling.
8.4.2 The grain size test results shall be rounded to one decimal place in accordance with GB/T
8170.
8.4.3 See Appendix D (TRANSLATOR NOTE: it should be Appendix C) for the comprehensive
accuracy of grain size determination.
9 Handling of Objections to Screening Results
9.1 If there is any objection to the screening results, manual screening will be used as the
arbitration method for grain size testing.
9.2 During arbitration sampling, representatives of both the supply-side ad demand-side must
be present. The sampling tools, inspection equipment and inspection site shall be provided by
the party where the goods are located, so as to facilitate the work of both parties.
9.3 During the re-inspection or arbitration of the user’s site, consider that various ferroalloy
products will increase a certain amount of excessively small grain size during the transportation.
For excessively small grain size, an increase of 2% is allowed for medium-carbon
ferromanganese, micro-low carbon ferromanganese, silicon-manganese alloy, metallic
manganese, ferrotitanium and ferrosilicon, and for other products, an increase of 1% is allowed.
10 Inspection Report
The inspection report shall include the following contents:
a) All information needed to identify the sample, laboratory name, address and test date;
b) Serial No. of implemented Standard;
c) Results and their expression;
d) Necessary detailed description of the specimen itself;
e) Any abnormal phenomena during the determination process and any operations not
specified in this Standard that may affect the specimen determination results;
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.