Dimensional specifications and processing processes of drill pipes for coal mines

Commonly used dimensions and specifications of drill pipes for coal mines:

Common dimensions of drill pipes used in coal mines include diameter and length. Common diameter specifications include Φ26, Φ38, Φ40, Φ42, Φ43, etc., while length specifications are usually between 0.5M and 6M. Commonly used specifications include 1M, 1.2M, 1.5M, 1.8M, 2M, 2.2M and 2.4M. wait. Suitable for coal electric drill drilling, these drill pipes feature an efficient twist-shaped design and are usually machined from high-quality carbon steel. In addition, the common diameters of cable drill pipes include Φ70mm, Φ73mm, Φ76mm, Φ89mm, etc., and their lengths are usually 1.5m, 2m or 3m, of which 3m is the most commonly used. This dimensional information provides coal mine drilling operations with a variety of options to meet different drilling needs. ‌

Processing process of drill pipe for coal mines:

1. Raw material procurement

The raw material of drill pipe for coal mines is seamless pipe, which requires high quality and relatively low price. Since the price of seamless steel pipes is greatly affected by market fluctuations, production companies usually choose to purchase appropriate quantities to avoid losses caused by price fluctuations.

2. Drill pipe cutting
The purchased seamless steel pipe needs to be cut into an appropriate number of drill pipes. First, it needs to be measured and marked, and then cut off using a saw or other processing equipment. This step needs to be very precise to avoid waste and poor versatility.

3. Processing and shaping
The cut drill pipe needs to be further processed, which mainly includes drilling, turning, stretching and other operations, to ultimately achieve the processing of the drill pipe geometry and accurate size control to ensure that the drill pipe can be effectively used in coal mining.

4. Heat treatment
The processed drill pipe needs to be heat treated to improve the tensile strength and hardness, which mainly includes quenching, tempering and other heat treatment processes. The heat treatment process must strictly control parameters such as temperature and time to ensure that the physical properties of the drill pipe meet standard requirements.

5. Surface treatment
Surface treatment is the last step in drill pipe processing, with the purpose of improving the corrosion resistance and rust-proof performance of the drill pipe. This step includes operations such as oil spraying, grinding, and painting. The surface treatment degree of the drill pipe is also one of the important criteria for considering product quality.

In short, drill pipe is an indispensable and important tool in coal mining, and its quality and processing process are related to coal mining efficiency and safety. Purchasing high-quality raw materials, reasonable cutting, precise processing, scientific heat treatment and effective surface treatment are the keys to ensuring the quality of drill pipes.

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