GB/T 4187-2017 in English

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Standard No:	GB/T 4187-2017
Document status:	VALID
Title in English:	Tungsten bars and rods
Title in Chinese:	钨条和钨杆
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-07-31
Implemented on:	2018-02-01
Superseding:	GB/T 4187-1984 Tungsten rods GB/T 4189-1984 Doped tungsten bars
Chinese Classification:	L90-Special electronic technology material
Professional Classification:	GB-National Standard
Related Keywords:	tungsten bars accuracy practical application case analysis taking wk80 tantalum bars version chemical composition control impurity element range chemical composition requirements new tungsten round bar varieties
Related Topics:	tungsten Hardened tungsten Ten tungsten sn/t 4187 Alkyl tungsten Tungsten wavelength icp tungsten surgical tungsten Tungsten drop Benzene tungsten Sample Rod Regulations Tungsten Page Thiourea Tungsten Tungsten Tungsten bromide GBT4187 GB/T 4187-1984 GB/T 4187-2017

《GB/T 4187-2017钨条和钨杆》由339-1（工业和信息化部（电子））归口，主管部门为工业和信息化部（电子）。

Introduction

In-depth interpretation of the National Standard of the People's Republic of China GB/T 4187—2017

GB/T 4187—2017 replaced the original GB/T 4187—1984 and GB/T 4189—1984, and made technical improvements mainly in the following aspects:

Projects	Requirements of the 1984 version	Improvements of the 2017 version
Chemical composition control	Impurity element range is not specified	Added content limits of K, Fe and other elements
Dimension specifications	Only basic range is specified	Refine classification and increase inspection requirements
Straightness control	Uniform standards, no distinction between specifications	Divided by diameter to improve accuracy

Taking WK80 tantalum bars as an example, the chemical composition requirements are as follows:

This grade is suitable for precision machining scenarios under high temperature environment.

Chemical composition inspection:Strictly follow the GB/T4324.1~4324.28 method to ensure that the impurity elements meet the requirements.
Dimension and tolerance control:Use high-precision measuring tools (such as vernier calipers, lever micrometers) to perform deviation inspection according to the requirements in the table.
Surface quality assessment: It is recommended to use an eddy current flaw detector and a standard sample block for roughness comparison to ensure there are no cracks and oxidation color.

More samples: GB 50021-2001(2009) DL/T 368-2010 JJG 21-2008

Sample only — not a preview of GB/T 4187-2017

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