GB/T 21182-2022 PDF in English
GB/T 21182-2022 (GB/T21182-2022, GBT 21182-2022, GBT21182-2022)
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Scraps of cemented carbide
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GB/T 21182-2022: PDF in English (GBT 21182-2022) GB/T 21182-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120
CCS H 69
Replacing GB/T 21182-2007
Scraps of cemented carbide
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
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 Classification ... 5
5 Technical requirements ... 6
6 Test methods ... 7
7 Inspection rules ... 7
8 Marking, packaging, transportation, storage and accompanying documents ... 8
9 Order form content... 9
Appendix A (Informative) Reference pictures of conventional bulk scraps of cemented
carbide ... 10
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020,
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document replaces GB/T 21182-2007 Scraps of cemented carbide; compared with
GB/T 21182-2007, in addition to structural adjustments and editorial changes, the main
technical changes are as follows:
a) Change the scope of application (see Chapter 1; Chapter 1 of the 2007 edition);
b) Change some normative references (see Chapter 2; Chapter 2 of the 2007 edition);
c) Add instructions for classification (see Chapter 4);
d) Add “profiles” to the group of “conventional bulk scraps of cemented carbide”,
including four varieties of “bars”, “boards”, “tubes” and “micro-drills” (see
Chapter 4);
e) Add the general requirements (see 5.1);
f) Add the requirements for appearance quality (see 5.2);
g) Change the requirements for chemical composition (see 5.3; 3.2 of the 2007
edition);
h) Change the sampling method (see 7.4; 5.4 of the 2007 edition).
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document was proposed by the China Nonferrous Metals Industry Association.
This document shall be under the jurisdiction of National Technical Committee 243 on
Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
Drafting organizations of this document: Zigong Great Wall CRD New Material Co.,
Ltd., Xiamen Golden Heron Special Alloy Co., Ltd., Zhuzhou Cemented Carbide Group
Co., Ltd., Nanchang Cemented Carbide Co., Ltd.
Chief drafting staffs of this document: Liu Zhi, Yang Hao, Dong Zhiping, Liu Jiang,
Chen Chengyi, Xie Haiwei, Liang Hong, Gong Bin, Huang Shuai, Wu Xiaogang.
This document was first published in 2007, and this is the first revision.
Scraps of cemented carbide
1 Scope
This document specifies the classification, technical requirements, test methods,
inspection rules, marking, packaging, transportation, storage, accompanying
documents and order form for scraps of cemented carbide.
This document applies to the recyclable residues and wastes containing tungsten and
cobalt generated during the production and use of cemented carbide products
(hereinafter referred to as scraps of cemented carbide).
2 Normative references
The following documents are normatively referenced in this document and are
indispensable for its application. For dated references, only the version corresponding
to that date is applicable to this document; for undated references, the latest version
(including all amendments) is applicable to this document.
GB/T 4324.11, Methods for chemical analysis of tungsten - Part 11: Determination
of aluminum content - Inductively coupled plasma atomic emission spectrometry
GB/T 4324.12, Methods for chemical analysis of tungsten - Part 12: Determination
of silicon content - Chlorination-molybdenum blue spectrophotometry
GB/T 5124.1, Methods for chemical analysis of hardmetals - Determination of total
carbon content - Gravimetric method
GB/T 5124.2, Methods for chemical analysis of hardmetals - Determination of
insoluble (free) carbon content - Gravimetric method
GB/T 5158 (all parts), Metallic powders - Determination of oxygen content by
reduction methods
GB/T 5314, Powders for powder metallurgical purposes - Sampling
GB/T 20255.1, Methods for chemical analysis of hardmetals - Determination of
calcium, potassium, magnesium and sodium contents - Flame atomic absorption
spectrometric method
GB/T 26050, Hardmetals - Determination of contents of metallic elements by X-ray
fluorescence - Fusion method
6 Test methods
6.1 General requirements
The general requirements for scraps of cemented carbide are visually inspected or
measured with a measuring tool of corresponding precision.
6.2 Appearance quality
The appearance quality of scraps of cemented carbide is visually inspected.
6.3 Chemical composition
6.3.1 The detection of W, Co, Fe, Ni, Ti, Ta, Nb, V, Cr, Mn, Mo element content in the
chemical composition of scraps of cemented carbide shall be carried out according to
the provisions of GB/T 26050.
6.3.2 The detection of the total carbon content in the chemical composition of scraps of
cemented carbide shall be carried out according to the provisions of GB/T 5124.1.
6.3.3 The detection of free carbon content in the chemical composition of scraps of
cemented carbide shall be carried out according to the provisions of GB/T 5124.2.
6.3.4 The detection of Al element content in the chemical composition of scraps of
cemented carbide shall be carried out according to the provisions of GB/T 4324.11.
6.3.5 The detection of Si element content in the chemical composition of scraps of
cemented carbide shall be carried out according to the provisions of GB/T 4324.12.
6.3.6 The detection of Ca and Mg element content in the chemical composition of scraps
of cemented carbide shall be carried out according to the provisions of GB/T 20255.1.
6.3.7 The detection of oxygen content in the chemical composition of scraps of
cemented carbide shall be carried out according to the provisions of GB/T 5158 (all
parts).
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 Scraps of cemented carbide shall be inspected by the supplier or a third party, to
ensure that the quality complies with the provisions of this document and the order form.
7.1.2 The buyer can inspect the received scraps of cemented carbide in accordance with
the provisions of this document and the order form. If the inspection results are
inconsistent with the provisions of this document and the order form, they shall be
sealed separately, and submitted to the supplier within one month from the date of
receipt, and negotiated by both parties.
7.2 Batch
Scraps of cemented carbide shall be submitted for acceptance in batches, and each batch
shall consist of scraps of the same type and composition.
7.3 Inspection items
Each batch of scraps of cemented carbide shall be inspected for general requirements
and appearance quality, as well as chemical composition when it is specified in the order
form.
7.4 Sampling
The sampling for testing the chemical composition of scraps of cemented carbide shall
be representative. Each batch of bulk scraps can be divided into 2 ~ 3 types according
to the principle of similar appearance, shape and size. For each type, take one sample,
which is about 100 g. For powder scraps, after mixing evenly, take 2 ~ 3 parts according
to the provisions of GB/T 5314. If there are special requirements, it shall be determined
by the supplier and the buyer through negotiation.
7.5 Determination of the test result
7.5.1 When the inspection result of the general requirements or the appearance quality
of scraps of cemented carbide is unqualified, judge the batch of scraps as unqualified.
7.5.2 When the inspection result of chemical composition of scraps of cemented carbide
is unqualified, double sampling is allowed for repeated inspection. If any result of the
repeated inspection is unqualified, judge the batch of scraps as unqualified.
8 Marking, packaging, transportation, storage and
accompanying documents
8.1 Marking
Each batch of scraps of cemented carbide shall be labeled and indicated with:
a) name of the supplier;
b) category, variety;
c) batch number;
d) weight.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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