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GB/T 4295-2019 (GBT4295-2019)

GB/T 4295-2019_English: PDF (GBT 4295-2019, GBT4295-2019)
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BASIC DATA
Standard ID GB/T 4295-2019 (GB/T4295-2019)
Description (Translated English) Tungsten carbide powder
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H71
Classification of International Standard 77.160
Word Count Estimation 7,731
Date of Issue 2019-06-04
Date of Implementation 2020-05-01
Drafting Organization Zigong Cemented Carbide Co., Ltd., Chongyi Zhangyuan Tungsten Industry Co., Ltd., Zhuzhou Cemented Carbide Group Co., Ltd., Nanchang Cemented Carbide Co., Ltd., Central South University
Administrative Organization National Nonferrous Metals Standardization Technical Committee (SAC/TC 243)
Proposing organization China Nonferrous Metals Industry Association
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

Standards related to: GB/T 4295-2019

GB/T 4295-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 71
Replacing GB/T 4295-2008
Tungsten Carbide Powder
碳化钨粉
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: MAY 01, 2020
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 Requirements ... 4
4 Test Method ... 8
5 inspection Rules ... 8
6 Marking, Packaging, Transportation, Storage and Quality Certificate ... 9
7 Order Form (or Contract) Content ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 4295-2008 Tungsten Carbide Powder. Compared with GB/T
4295-2008, the major technical changes of this Standard are as follows besides the editorial
modifications:
--- clarify that "this standard is applicable to tungsten carbide powder with an average
particle size no less than 0.6μm for the production of cemented carbide and other powder
metallurgy products" (see Clause 1 of this Edition; Clause 1 of the 2008 Edition);
--- Modify the product designation; and divide tungsten carbide powder into 18 designations
according to the average particle size (see 3.1 of this Edition; 3.1 of the 2008 Edition);
--- Increase the content requirements of impurities, such as As, Bi, Cd, Co, Cr, Cu, Mn, Ni,
P, Pb, Sb, Sn, Ti, V; and increase the content requirements of impurities, such as Ca, Fe,
Mg, Mo, S, Si (see 3.2 of this Edition; 3.2 of the 2008 Edition);
--- Add specific surface area requirements for three designations of FWC06-07, FWC07-08,
and FWC08-10; modify the requirements for free carbon content, combined carbon
content and oxygen content of some designations of tungsten carbide powder (see 3.3 of
this Edition; 3.3 of the 2008 Edition).
This Standard was proposed by China Non-Ferrous Metals Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee on Non-Ferrous
Metals of Standardization Administration of China (SAC/TC 243).
Drafting organizations of this Standard: Zigong Cemented Carbide Co., Ltd.; Chongyi
Zhangyuan Tungsten Co., Ltd.; Zhuzhou Cemented Carbide Group Co., Ltd.; Nanchang
Cemented Carbide Limited Liability Company; and Central South University.
Chief drafting staffs of this Standard: Shu Jun, Zhang Huamin, Liao Jun, Shi Kaihua, Zhang
Qiulin, Li Siyuan, Liang Hong, Wu Aihua, and Zeng Jie.
The historical editions replaced by this Standard are as follows:
--- GB/T 4295-1984, GB/T 4295-1993, and GB/T 4295-2008.
Tungsten Carbide Powder
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking, packaging,
transportation, storage, quality certificates and purchase orders (or contracts) for tungsten
carbide powder.
This Standard applies to tungsten carbide powder with an average particle size no less than
0.6μm for the production of cemented carbide and other powder metallurgy products.
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
Document.
GB/T 3249 Test method for fisher number of metal powders and related compounds
GB/T 4324 (all parts) Methods for chemical analysis of tungsten
GB/T 5124.1 Methods for chemical analysis of hard-metals - Determination of total carbon
content - Gravimetric method
GB/T 5124.2 Methods for chemical analysis of hard-metals - Determination of insoluble
(free) carbon content - Gravimetric method
GB/T 5314 Powders for powder metallurgical purposes - Sampling
GB/T 13390 Metallic powder - Determination of the specific surface area - Method of
nitrogen adsorption
YS/T 559 Methods for emission spectrum analysis of tungsten
3 Requirements
3.1 Product classification
Tungsten carbide powder is divided into 18 designations according to the average particle size,
such as FWC06-07, FWC07-08, FWC08-10, FWC10-15, FWC15-20, FWC20-25, FWC25-30,
4 Test Method
4.1 The main composition content is calculated by impurity reduction method.
4.2 The determination of impurity content shall be carried out according to the provisions of
GB/T 4324 or YS/T 559; and the arbitration analysis method shall be carried out according to
the provisions of GB/T 4324.
4.3 The determination of the average particle size shall be carried out in accordance with the
provisions of GB/T 3249.
4.4 The determination of the specific surface area shall be carried out in accordance with the
provisions of GB/T 13390.
4.5 The determination of the total carbon content shall be carried out according to the provisions
of GB/T 5124.1; the determination of the free carbon content shall be carried out according to
the provisions of GB/T 5124.2; and the combined carbon content shall be obtained by
subtracting the free carbon content from the total carbon content. The determination of total
carbon and free carbon contents can also be carried out according to the method negotiated
between the supplier and the purchaser.
4.6 The determination of oxygen content shall be carried out according to the provisions of
GB/T 4324.
4.7 Sieving shall be carried out in a manner agreed upon by both the supplier and the purchaser.
4.8 The appearance quality shall be inspected visually.
5 inspection Rules
5.1 Inspection and acceptance
5.1.1 The product shall be inspected by the quality supervision department of the supplier to
ensure that the product quality complies with the provisions of this Standard; and fill in the
product quality certificate.
5.1.2 The purchaser can inspect the received product according to the provisions of this
Standard. If the inspection result is inconsistent with the provisions of this Standard, it shall be
submitted to the supplier within 30 days from the date of receipt of the product, and the supplier
and the purchaser can negotiate to resolve it. If arbitration is required, arbitration sampling shall
be carried out jointly by both parties on the purchaser side.
5.2 Batching
The products shall be submitted for acceptance in batches; and each batch is composed of
"upward".
6.2 Packaging
The outer packaging of the product is in an iron drum; and the inner packaging is in a
polyethylene plastic bag, which is tightly sealed. Or packaged in a method determined by both
the supplier and the purchaser. The weight of each piece is determined through negotiation
between the supplier and the purchaser.
6.3 Transportation
When the product is transported, it shall be protected from moisture and shall not be violently
bumped.
6.4 Storage
The product shall be stored in a dry, ventilated, acid-base-free environment to prevent oxidation.
The storage period should not exceed half a year.
6.5 Quality certificate
Each batch of products shall be accompanied by a product quality certificate stating:
a) Name, address, zip code of the supplier;
b) Product name and designation;
c) Batch number;
d) Net weight;
e) The number of this Standard;
f) Various analysis and inspection results and the seal of the quality supervision department;
g) Inspector number;
h) Date of inspection.
7 Order Form (or Contract) Content
The order form (or contract) shall include the following contents:
a) Product name;
b) Product designation;
...