GB/T 26725-2023 (English Version)

Standard No.: GB/T 26725-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 26725-2023
Replace: GB/T 26725-2011

Scope: This document specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, accompanying documents and order form contents of ultrafine tungsten carbide powder. This document is applicable to the production of ultrafine tungsten carbide powder for powder metallurgy products such as cemented carbide.

Introduction

1. Background and significance of standard formulation

Ultrafine tungsten carbide powder is an important basic material in the field of powder metallurgy and is widely used in the production of cemented carbide. With the advancement of technology and changes in market demand, the original standard GB/T 26725-2011 can no longer fully meet the development needs of the current industry. This revision aims to improve product quality and meet the needs of high-end manufacturing for high-performance materials.

2. Comparative analysis of standard frameworks

Standard version	Main technical changes	Revision background
GB/T 26725-2011	The original classification and chemical composition requirements were relatively simple.	Industry development needs to increase, requiring more sophisticated technical indicators.
GB/T 26725—2023	- Increased limits on chemical impurity content; - Updated oxygen content and carbon content analysis methods.	Adapt to the needs of high-tech fields and improve material purity.

3. Interpretation of technical requirements

Take the FWC001 grade as an example, its specific surface area requirement is 3.20~3.80 m²/g. This indicator directly affects the activity and performance stability of the material, and needs to be measured using the advanced BET method.

4. Implementation Suggestions

Manufacturers should be equipped with professional testing equipment, such as GCMS and ICP-OES.
In the procurement process, acceptance must be carried out strictly in accordance with standard requirements.
It is recommended to conduct regular quality review and analysis and continuously optimize the production process.

GB/T 26725-2023 Referenced Document

GB/T 19587 Determination of the specific surface area of solids by gas adsorption using the BET method
GB/T 4324.17 Methods for chemical analysis of tungsten.Part 17:Determination of sodium content.Flame atomic absorption spectrometry
GB/T 4324.18 Methods for chemical analysis of tungsten.Part 18:Determination of potassium content.Flame atomic absorption spectrometry
GB/T 4324.23 Methods for chemical analysis of tungsten.Part 23:Determination of sulfur content.The combustion-conductometric titration and high frequency combustion-infrared absorption method
GB/T 4324.24 Methods for chemical analysis of tungsten.Part 24:Determination of phosphorus content.Molybdemum blue photometry
GB/T 4324.25 Methods for chemical analysis of tungsten.Part 25:Determination of oxygen content.Pulse heating inert gas fusion -infrared absorption method
GB/T 5124.2 Methods for chemical analysis of hardmetals.Determination of insoluble (free) carbon content.Gravimetric method
GB/T 5314 Powders for powder metallurgical purposes.Sampling
JB/T 6647 The gas-volumetric method after combustion in the pipe furnace for the determination of total carbon content.Method for chemical analysis of carbonate
YS/T 559 Methods for emission spectrum analysis of tungsten

GB/T 26725-2023 history

2023 GB/T 26725-2023 Ultrafine Tungsten Carbide Powder
2011 GB/T 26725-2011 Superfine tungsten carbide powder