GB/T 6885-2020 English PDF (GBT6885-2020)

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GB/T 6885-2020: Hard metals -- Sampling and testing method of mixed powders
GB/T 6885-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 70
Replacing GB/T 6885-1986
Hardmetals – Sampling and Testing Method of Mixed
Powders
(ISO 4884:1978, Hardmetals – Sampling and Testing of Powders Using
Sintered Test Pieces, NEQ)
ISSUED ON: MARCH 06, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Sampling ... 5
5 Preparation of the Test Piece ... 5
6 Test Methods ... 5
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 6885-1986 Hardmetals - Sampling and Testing of Mixed
Powder. Compared with GB/T 6885-1986, this Standard made the major technical
changes as follows besides the editorial modifications:
--- Modify the description of batching in sampling (see 4.2 of this Edition; 3.2 of 1986
Edition);
--- Modify the process requirements for preparation of test pieces (see Clause 5 of
this Edition; Clause 4 of 1986 Edition);
--- Add the test methods for the Vickers hardness of hardmetals (see Clause 6 of
this Edition).
This Standard was formulated by using the re-drafting method and referring to ISO
4884:1978 Hardmetals – Sampling and Testing of Powders Using Sintered Test Pieces;
the degree of consistency between this Standard and ISO 4884:1978 is inequivalent.
This Standard was proposed by China Non-Ferrous Metals Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Non-ferrous Metals (SAC/TC 243).
Drafting organizations of this Standard: Zhuzhou Cemented Carbide Group Co., Ltd.;
Zigong Cemented Carbide Co., Ltd.; and Shenzhen Zhucheng Science and
Technology Co., Ltd.
Chief drafting staffs of this Standard: Mao Shanwen, Yao Xiongzhi, Liang Hong, Liu
Tiemei, Zhang Yue, and Li Siyuan.
The historical edition replaced by this Standard is as follows:
--- GB/T 6885-1986.
Hardmetals – Sampling and Testing Method of Mixed
Powders
1 Scope
This Standard specifies mixed powder sampling, test piece preparation and test
methods for determining the properties of hardmetals by sintering test pieces.
This Standard is applicable to the sampling and test methods of mixed powder of
hardmetals.
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) are applicable to this document.
GB/T 3488.1 Hardmetals - Metallographic Determination of Microstructure - Part
1: Photomicrographs and Description
GB/T 3489 Hardmetals - Metallographic Determination of Porosity and
Uncombined Carbon
GB/T 3848 Hardmetals - Determination of (the Magnetization) Coercivity
GB/T 3849.1 Hardmetals - Rockwell Hardness Test (Scale A) - Part 1: Test Method
GB/T 3850 Impermeable Sintered Metal Materials and Hardmetals - Determination
of Density
GB/T 3851 Hardmetals - Determination of Transverse Rupture Strength
GB/T 5314 Powders for Powder Metallurgical Purposes - Sampling
GB/T 7997 Hardmetals - Vickers Hardness Test