Cemented carbide for coal-mining tools M23 type
| Grade Introduction of Mineral |
| Grade | Co | Grain Size of WC | Hardness | Density | Flexural Strength | Bending Tough- ness | Elastic
Modulus | Coeffi-
cient of Thermal Expan- sion | Application |
| Co% | HRA | HV30 | g/cm3 | MPa | N/mm2 | GPa | 10-6/°C |
| G206 | 6 | Medium | 90.8 | 1500 | 14.9 | 3200 | | 530 | 4.9 | Suitable for DTH drilling with high wind pressure |
| G506 | 6 | Coarse | 88.0 | 1200 | 14.9 | 2500 | | 530 | 4.9 | Suitable for gear shaper cutting of concrete and
asphalt road |
| G208 | 8 | Medium | 89.1 | 1300 | 14.7 | 2750 | | 510 | 5.1 | Suitable for DTH drilling with medium and low
wind pressure,and rock breaking |
| G308 | 8 | Medium | 88.8 | 1270 | 14.7 | 2750 | | 510 | 5.1 | Suitable for tri-cone drill bit in milling, and tri-cone |
| G211 | 11 | Medium | 88.0 | 1200 | 14.4 | 2800 | | 478 | 5.6 | tri-cone drill bit in milling,
drill bit in engineering |
| G215 | 15 | Medium | 86.8 | 1100 | 14 | 2800 | | 430 | 6.3 | Suitable for oilfield composite sheet |
| G510 | 10 | Coarse | 86.2 | 1040 | 14.5 | 2700 | | 490 | 5.4 | Suitable for rotary drilling cutter, and coal cutters |
| G512 | 12 | Coarse | 86.0 | 1030 | 14.3 | 2900 | | 470 | 5.7 | Suitable for tunnel boring machine of scraper,cut-
ter and wear plate |
| G513 | 13 | Coarse | 85.6 | 1000 | 14.2 | 2900 | | 460 | 5.8 | Suitable for tunnel boring machine of scraper,cut-
ter and wear plate |
| G707 | 7 | Extra
Coarse | 86.3 | 1050 | 14.8 | 2200 | | 520 | 5 | Suitable for hard rock in engineering, and DTH
drilling cutter |
| G806 | 6 | Extra
Coarse | 86.2 | 1040 | 14.9 | 2100 | | 530 | 4.9 | Suitable for high rock of rotary drilling cutter |
Hunan Boyun Dongfang Powder Metallurgy Co., Ltd. was founded in
1994 by the Institute
of powder metallurgy of Central South University of Technology (now
the research center
of powder metallurgy engineering of Central South University) and
Hunan Yinzhou Co.,
Ltd. (now the wholly-owned member company of China Dongfang asset
management
company, Bangxin Asset Management Co., Ltd.),now it is the holding
subsidiary of
Hunan Boyun New Material Co., Ltd. (Stock Code: 002297), with a
registered capital
of 60 million yuan.The company is a national high-tech enterprise
with Academician
Huang Boyun, the top material scientist in China, as the chief
scientist and honorary
chairman of the board, integrating domestic and foreign talents and
technological
advantages, integrating production, learning, research and
application, engaged in the
research, development, production and sales of high-performance
cemented carbide.
The member of China Tungsten Industry Association, China mold
industry association,
China machinery industry metal cutting tool technology association.
With strong support from Central South University, State Key
Laboratory of
Powder Metallurgy, National Engineering Research Center of Powder
Metallurgy,
Quality Supervision and Inspection Center of Powder Metallurgy
Products of
Chinese Nonferrous Material Industry , the Company has played
leading role in
three projects of “National High Technology Research and
Development Program
(863 plan)”.
