What is the specific alloy used on tungsten carbide drill bits for rock drilling?

Tungsten carbide drill bits used for rock drilling are primarily made from a combination of tungsten carbide and cobalt. This alloy is known for its exceptional hardness, wear resistance, and toughness, making it suitable for drilling through hard rock formations. Here are some common grades and their applications:

1. YG11C

- Density: 14.40 g/cm³

- Hardness: 86.5 HRA

- Flexural Strength: 2450 MPa

- Applications: Heavy rock drills, impact rotary drills, coal cutter teeth, and oil drill bits for medium and hard rock layers.

2. YG13C

- Density: 14.30 g/cm³

- Hardness: 86.0 HRA

- Flexural Strength: 2500 MPa

- Applications: Oil roller cone bits, impact rotary drills, and heavy rock drills for medium and hard rock layers.

3. YG15

- Density: 14.00 g/cm³

- Hardness: 86.5 HRA

- Flexural Strength: 2550 MPa

- Applications: Impact rotary drills and heavy rock drills for hard and extremely hard rock layers.

4. JK15

- Density: 14.10 g/cm³

- Hardness: 85.0 HRA

- Flexural Strength: 2600 MPa

- Applications: Impact rotary drills and heavy rock drills for hard and extremely hard rock layers.

5. JK13

- Density: 14.30 g/cm³

- Hardness: 86.0 HRA

- Flexural Strength: 2550 MPa

- Applications: Oil roller cone bits, impact rotary drills, and heavy rock drills for hard and medium-hard rock layers.

6. JK1

- Density: 14.45 g/cm³

- Hardness: 86.7 HRA

- Flexural Strength: 2500 MPa

- Applications: Impact rotary drills and heavy rock drills for medium-hard and hard rock layers.

7. JK2

- Density: 14.55 g/cm³

- Hardness: 87.0 HRA

- Flexural Strength: 2450 MPa

- Applications: Impact rotary drills and coal cutter teeth for medium-hard and hard rock layers.

8. JK2.5

- Density: 14.60 g/cm³

- Hardness: 87.3 HRA

- Flexural Strength: 2450 MPa

- Applications: Heavy mining machine picks for medium-hard and hard rock layers.

9. JK3

- Density: 14.70 g/cm³

- Hardness: 87.7 HRA

- Flexural Strength: 2400 MPa

- Applications: Column teeth bits and anchor drill bits for medium-hard rock layers.

10. JK4

- Density: 14.80 g/cm³

- Hardness: 88.2 HRA

- Flexural Strength: 2350 MPa

- Applications: Column teeth bits and anchor drill bits for soft and medium-hard rock layers.

11. DS25-10

- Density: 14.30 g/cm³

- Hardness: 87.5 HRA

- Flexural Strength: 2500 MPa

- Applications: Impact drill bits and coal cutter teeth for medium-hard rock layers.