- flushing hole according to the size of the rolled stock – H19 6 ± 0,4 mm; R32 9.2 ± 0.5 mm; R38 10.3 ± 0.6 mm;

- the allowable curvature of the rods is db ≤ 0.1% (≤1.0 mm per 1000.0 mm length);

- Hardness of rolled products in the state of delivery 35-45 HRС;


- the depth of the decarburized layer on the outer surface is ≤0.3mm, on the inner surface -≤0.2mm;

- deviation of the axis of the flushing hole according to each size - H19 ≤0.6mm; R32≤0.75mm and R38 ≤0.8mm;


- deviation of the size along the faces and outer diameter, respectively, H19 ± 0,15mm; R32 ± 0,18mm; R38 ± 0,30mm;

- steel 55SiMnMo with the following mass parts of chemical elements (nominal)%:


carbon, С – 0,52 ... 0,55;
manganese, Mn – 0,71 ... 0,76;
silicium, Si – 1.24 ... 1.31;
molybdenum, Mo – 0,47 ... 0,49;
Aluminum, Al – 0.025 ... 0.032;
chromium, Cr - ≥0.09;


nickel, Ni - ≥0,03;

titanium, Ti - ≥0,05;

tungsten, W- ≥0.01;

vanadium, V- ≥0.01;

phosphorus P, sulfur S, copper Cu – within the range of 0.003 ... 0.01 each;
rest (base) iron Fe.


- angle of pruning of rods 90 ° ± 1,5 mm;
- protection against corrosion.
- Material of steel: 55SiMnMo
- Packing Bulk; 1500kg/packing.

Quantity ordered by Customer from Ukraine
H19 Hollow Drill Steels: 10Tons
R32 Hollow Drill Steels: 10Tons
R38 Hollow Drill Steels: 10 Tons.