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Cemented Carbide
What is cemented carbide?
Cemented carbide was invented by a German Mr. Schroter in 1923, It is a kind of insoluble compound basis with metal hardness (hard phase) and the metal as binder (metal phase) by powder metallurgic method made high strength and high wear resistant material. WC-Co cemented carbide is composed by WC hard phase and Co bonding phase, the hard phase result in cemented carbide's wear resistant characteristic, the binder phase result in toughness. This composition of normal cemented carbides has the characteristic of contradictory properties, good toughness inverse to poor wear resistance; Good wear resistance inverse to poor toughness.
Basic features of cemented carbide
1、High hardness and high wear resistance, especially at higher temperatures still has high hardness means the red hardness feature；
2、High elastic modulus, good rigidity;
3、High compressive strength;
4、High chemical stability and high resistance to acid corrosion;
5、Low expansion coefficient;
6、Low fracture toughness。
Application of cemented carbide
Commonly known as "the teeth of industry", cemented carbides are widely used as cutting tools, impact tools,wear-resistant and corrosion-resistant parts, and play an important role in cutting, geological exploration, mining, oil drilling, mold manufacturing and other industries.
Main physical and mechanical performance indexes of each grade
| Grade | Density（g/cm³） | Hardness（HV30） | Coercive force（Ka/m） | Grain size（um） | TRS（MPa） |
| 306-G01 | 14.95 | 1460 | 12.6 | Intermediate | ≥3200 |
| 306-G02 | 14.95 | 1440 | 11.6 | Intermediate | ≥3000 |
| 306-G03 | 14.95 | 1500 | 13.2 | Intermediate | ≥3200 |
| 206-S01 | 14.95 | 1460 | 12.6 | Intermediate | ≥3200 |
Button bit insert types
Bit Selection Guide
| ROCK TYPE | DUCTILITY | BREAK ABILITY | WEAR ABILITY | CONTROL ABILITY | THREADED BIT INSERT | THREADED BIT STYLE | TAPER BIT STYLE |
| Talc | High | Low | Low | High | Blade | 2 – Prong 3 – Prong |
2 – Prong 3 – Prong |
| Shale | High | Low | Medium | Medium | Parabolic Ballistic | Flat face Drop center |
Button bit Blade - Multi |
| Limestone | Medium | High | Low | High | Parabolic Ballistic | Flat face Drop center |
Button bit Blade - Multi |
| Sandstone | Medium | High | High | Medium | Parabolic | Flat face Drop center |
Button bit Blade - Multi |
| Marble | Low | Medium | Low | High | Hemi | Flat face | Blade - Multi |
| Gniess | Low | Medium | High | High | Hemi | Flat face | Blade |
| Feldspar | Low | Medium | Low | High | Hemi | Flat face | Blade |
| Granite | Low | Low | Medium | High | Hemi | Flat face | Blade |
| Diorite | Low | Low | Low | High | Hemi, Tent | Flat face X-Cross |
Blade |
| Quartzite | Low | Low | High | High | Hemi, Tent | Flat face X-Cross |
Blade |
