RESEARCH OF WITNESS SAMPLES OF SEAMLESS HOT-ROLLED PIPES AFTER TESTS IN WELLS OF OIL FIELDS OF RUP «ON «BELORUSNEFT» REGARDING THEIR CORROSION RESISTANCE

Field tests of the witness samples of corrosion made of seamless hot-rolled pipes of various steel brands produced by JSC «BMZ – Management Company of Holding «BMK» were carried out in the operating pipelines at three oil fields. The results of the conducted researches made by the experts of RUP «ON «Belorusneft» permitted to define the most stable steel brands against corrosion for each of the oil fields: for a well 146 New and Davydovsky fields – brand steel TT309; for a well 270 Rechitsky fields – steel brands 20 and TT359; for a well 59 Ostashkovichsky fields – TT309 brand steel

RESEARCH OF DEFECTS OF CONTINUOUS CAST BILLET WITH DIAMETER 200 MM AND REASONS OF THEIR ORIGIN IN CONDITIONS OF JSC «BMZ»

Defects of continuous cast still billets, which run because of the deviation from the given technology, are investigated and causes of their forming are established in JSC “BSW”

DEFECT «TRACKS FROM CUTS ON ROLLERS» ON THE EXTERNAL SURFACE OF SEAMLESS HOTROLLED PIPES

The defect, revealed on an external surface of sleeves at piercing of slug at piercing mill of helical rolling of construction «СТР100VD» with twin-pillar rollers of mushroom shape and guiding disks of Disher, is considered

RESEARCH OF INFLUENCE OF OXIDATION ON CONDITION OF THE BLANKS SURFACE FOR IMPROVEMENT OF QUALITY OF HOT­ROLLED SEAMLESS PIPES

It is shown that research of scaling on the uninterruptedly-casted and the hot-rolled blanks, enabling to improve quality of production and due to that to increase its competitiveness, is actua

DECREASE OF CRACK-FORMATION IN LOW-CARBON CONSTRUCTIONAL HIGH-QUALITY BAR OF THE CONTINUOUSLY CAST SLUG

Features formation of cracks in steel 18хГТ are investigated. It is established that in the course of crystallization the peritectic transformation goes on phase reactions: formation of primary ferrite from liquid and formation of peritectic austenite from this ferrite and residual liquid