水式电煤钻杆
水式电煤钻杆/ The water type electric coal drill pipe
采用特殊材料，提高了钻杆的韧性和强度、硬度和耐磨性。
直径:φ27、φ38 长度: 1m- 3m
Te
The use ofspecial materials. improved the toughness and strength. hardness and wear resstanceof
drill pipe.
Diameter ：φp27 ,φb38 length： 1m to 3m
