Mastering the Production of Hot-Deformed Casing from 32Г2 Steel at “Baku Steel Company” Ltd

Abstract

The results of studies on the development of the production of casing pipes with a size of 114×7.4 mm from the steel 32Г2 according to GOST 31446-2017, ARI 5ST 10 edition, accuracy class 1 strength group H40 at “Baku Steel Company” Ltd are presented. In an electric arc furnace, several batches of steel graded 32Г2 were smelted from a charge consisting of metal waste and about 20% of metallized HBI pellets. Then, pipe blanks with a diameter of Ø130 mm were cast on a continuous casting machine (CCM). From these blanks, casing pipes with an outer diameter of Ø117 and a wall thickness of 7.4 mm were rolled on a piercing and rolling machine. After hot rolling of tubular billets, the casing pipes were subjected to thermal hardening. The tubes were heated in a continuous sectional furnace to the quenching temperature, then they were cooled with water from the outer surface, in a sprayer, and then subjected to tempering when leaving the furnace, i.e. there was a self-release with subsequent warm calibration and editing. When using low-alloy steel, the developed technology provides uniform structures and properties of the metal along the wall thickness. The strength class of casing pipes made of the steel 32Г2 corresponds to 1, and the strength group is H40.