This standard specifies the product classification, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of tungsten carbide powder. This standard is mainly applicable to tungsten carbide powder used in the production of cemented carbide, etc. GB/T 4295-1993 Tungsten Carbide Powder GB/T4295-1993 Standard Download Decompression Password: www.bzxz.net

UDC 669. 27
National Standard of the People's Republic of China
GB/T 4295—93
Tungsten carbide powder
Tungsten carbide powder
1993-03-20 Issued
1993-12-01 Implementation
Issued by the State Administration of Technical Supervision
National Standard of the People's Republic of China
Subject Content and Scope of Application
Tungsten carbide powder
GB/T 4295—93
Replaces GB 429581
This standard specifies the product classification, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of calcium carbide powder. This standard is mainly applicable to tungsten carbide powder used in the production of cemented carbide, etc. Reference standards
GB3249
Method for determination of particle size of refractory metal and chemical powdersFischer methodGB4324
GB 5124
Chemical analysis method for tungsten
Analysis method for cemented carbide
GB5314 Sampling method for powder metallurgy 3
Product classification
Tungsten carbide powder is divided into two grades, FWCA and FWCB, according to its chemical composition. Tungsten carbide powder is divided into two specifications according to its average particle size range. Product grade and specification representation method.
Final example:
4 Technical requirements
100-140
Indicates the average particle size range of 10.0~14.0um and the grade with tungsten carbide content of more than 99.8%
Tungsten carbide powder
4.1 The appearance of tungsten carbide powder should be uniform and dark gray, without mechanical inclusions. 4. 2 The chemical composition of tungsten carbide powder should comply with the requirements of Table 1. Approved by the State Bureau of Technical Supervision on March 20, 1993, implemented on December 1, 1993
Product brand
Dust content
Combined carbon
GB/T4295--93
Free carbon
, not more than
≥99. 8 6. 13± 0. 05
26.070.060. 02 0.0036.0020.0020.00150.00150. 0020.0020,01
6.13±0.05
6.070.080.03
0.0050.0050,0020.0030.0030.0050,0030.03Note: () The content of tungsten phosphide powder is 100% minus the content of various impurities (except gas impurities) and free carbon. ② The total carbon and combined carbon of tungsten carbide powder used in domestic rubber production process are allowed to be adjusted. ③ Combined carbon is the pad of total carbon and free carbon. 4.3 The Fisher average particle size range and oxygen content of tungsten carbide powder should comply with the provisions of Table 2. Table 2
Average particle size model F·SSS
Product specifications
FWCA OB-10
FWCB 08-10
FWCA 10-14
FWCB 10-14
FWCA 14-18
FWC 14-18
FWCA 18-24
FWCB 18-24
FWCA 24-30
FWCB24-30
FWCA30-40
FWCB 30-40
20.80~1.00
>1. 00~1. 40
>1. 40 ~ 1. 80 | | tt | | > 1. 80 ~ 2. 40 | | tt | 40-50
FWCA 50-70
FWCB 50-70
FWCA 70-100
FWCB 70-100
FWCA 100-140
FWCR 100-140
FWCA 140-200bzxz.net
FWCB140-200
FWCA 200-260
FWCB 200-260
Average particle size range F·SSS
>4. 00~5. 00
>5.00~7.00
7. 00~-10. 00
10.00~14,00
3-14. 00--20. 00
>20, 00--26. 00
Oxygen content
not more than
4.4 Tungsten carbide powder should be sieved. For powders with a Fisher average particle size of <2μm, the mesh aperture shall not be less than 150um; for powders with an average particle size of 2~10xm, the mesh aperture shall not be less than 75μm; for powders with an average particle size of >10pm, the mesh aperture shall not be less than 180μm. 5 Test methods
5.1 The chemical composition analysis of tungsten carbide powder shall be carried out in accordance with the provisions of GB.4324. 5.2 The carbon content (total carbon and free carbon) of tungsten carbide powder shall be determined in accordance with the provisions of GB5124. 5.3 The average particle size of tungsten carbide powder shall be determined in accordance with the provisions of GB3249. 6 Inspection rules
6.1 The product shall be inspected by the technical supervision department of the supplier. Ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 6.2 The buyer may inspect the received products in accordance with the provisions of this standard. If the inspection results do not conform to the provisions of this standard, they should be reported to the supplier within one month from the receipt of the product, and the supply and demand parties shall negotiate to resolve the problem. If arbitration is required, the supplier and the buyer shall jointly take samples at the buyer's side. 2
GB/T 4295—93
6.3 Products shall be submitted for acceptance in batches. Each batch shall consist of powders produced by the same process system, with a batch of not less than 1000k or as agreed upon by the supplier and the buyer.
6.4 The arbitration sampling method shall be carried out in accordance with the relevant provisions of GB5314, and the number of samples shall be in accordance with the provisions of Table 3 Table 3
Number of powder containers for a batch of powder, pieces
12~-20
21-~35
Number of containers for sample collection, pieces
If one item of the arbitration test results does not meet the requirements of this standard, the item shall be doubled for re-sampling in the batch of products. If about 6.5
does not meet the requirements of this standard, the batch of products shall be unqualified. Marking, packaging, transportation, storage
7.1 The product is packaged in iron drums lined with polyethylene plastic bags and sealed. The net weight of each piece shall not exceed 50kg. It can also be packaged in the packaging requirements of the supplier and demander.
7.2 The outer packaging shall be marked with the supplier name, product name and brand, specification, batch number and net weight. And with "moisture-proof" "upward" and other words or mark
Each batch of products should be accompanied by a quality certificate indicating: 7.3
Supply name,
Product name
Product brand and specification;
Product batch number and weight;
Results of various analysis and inspection and the stamp of the inspection department; This standard number:
Factory date.
When transporting products, prevent moisture and do not touch them violently. The products should be stored in a dry, ventilated place without acid or alkali atmosphere to prevent simplification. The storage period shall not exceed half a year. Additional remarks:
This standard is proposed by China Nonferrous Metals Industry Corporation and drafted by Zigong Cemented Carbide Factory. This standard is mainly The main drafter is Yao Yongan.
(Beijing) Xindengzi No. 023
National Standard of the People's Republic of China
Tungsten Carbide Powder
GB/T429503
Published by China Standards Press
(Yilihe, Fuwai, Beijing)
Printed by Li Huangzhu Printing Factory of China Standards Press
Distributed by Beijing Distribution Office of Xinhua Bookstore Sold by Xinhua Bookstores in various places Copyright is exclusive and reproduction is prohibited
Format 880×12301716 Printing Sheet 1/2 Number of Words 6,000 Words Edition September 1993 First Printing
September 1993
Printing Number 1-3000
Number of Embossing: 155066 *1-9998
Price 0.90 yuan
Standard 225--31
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