|The main features:|
Pipes are made from coiled steel that ensures a narrow range of chemical composition, low percentage of impurities (sulfur, phosphorus) and inclusions, minimum difference in wall thickness in the final pipe.
The specified wall thickness of the coiled steel, the-state-of-the-art technology and high precision of the rolls ensure much better precision of geometrical parameters in the final pipe compared to the same seamless pipe. That allows us to make more precise calculations of the production strings and as a result to lower the cost.
In the pipe mill the inside and outside flash shall be removed. The outside flash is completely removed, the height of the inside flash shall not exceed 0.38 mm.
100% of welded seam is annealed that ensures weld seam structure normalization and equal strength both of the weld seam and the base material.
The technology and the equipment allow the application of round and buttress threads on pipe ends to national and international standards and licenses. New Premium threads (ВрТЗ-Н-1 to TU 1327-003-25955489-2010, ВрТЗ-Н-2 to ТУ 1327-011-25955489-2014) are implemented and patented.
Use of specially developed steel groups allows us to produce pipe to be used in cold resistance (18ГФБ) and corrosion resistance applications (15ХГМФ).
Use of different steel groups (including 22ГЮ, 25ГЮ) and full-body heat treatment allows us to achieve the following grades:
- Дс, Кс, Ес, Лс, Мс, Дсх, Ксх, Есх, Лсх (to GOST R 52203 and TU 14-3Р-31-2005);
- J55, К72, N80Q, R95, L80 Type 1, Р110 (to API Spec 5CT).
As agreed with the customer, the pipe of intermediate sizes and grades can be manufactured.
In order to protect pipe from corrosion during transit, the pipe is coated with the protective varnish with subsequent UV-drying at the unique system that ensures a quality coating and a long storage in severe weather conditions.