Hollow Hexagonal Drill Steel

Hollow Hexagonal Drill Steel, is a rock drill steel or integral drill steel without tips. Hollow Drill Steel Bar is a type of steel specially used in drill rod manufacture, high intension and toughness.

Integral drill rod's shank sizes 82.5 mm*22mm(3 1/4”*7/8”), 108mm*22mm(4 1/4”*7/8”), 108mm*25mm(4 1/4”*1”), 159,*25mm(6 1/4”*1). Lengths: 400mm to 6400mm(1’4”-21’). Head diameters: 27mm to 40mm.

Bloom Hollow Hexagonal Drill Steel has following advantages:

1. High fatigue strength and toughness, high intension.

2. High resistance to wear and permanent distortion.

3. Industrial process of heat treatment.

4. Uniform straightness, eliminating the need for straightening.

Hot Rolled Hexagonal Hollow Drill Steel

Steel Grade:55SiMnMo

Chemical Composition:

C: 0.92-1.03PCT

Si: 0.25-0.45PCT

Mn: 0.25-0.45PCT

Cr: 0.80-1.20PCT

Ni: 0.25PCT MAX

Mo: 0.20-0.30PCT

S,P: 0.025PCT MAX

Cu: 0.30PCT MAX