Method for producing smooth and ribbed wire rod

摘要

The present invention relates to a method of obtaining plain and ribbed wire rod with multi-phase structure, consisting in pre-heating billets made of different grades of steel, particularly with 0.07 - 0.40%C content, in a walking-beam furnace to a temperature of 1 170-1 195°C and then rolling them to final diameters within the range from 5.5 mm to 9 mm, where the process is characterised in that the wire rod passes through water boxes downstream Morgan mill at the speed not lower than V=30m/s. At least one water box, pinch-roll unit and head for laying coils on the controlled cooling conveyor system are installed downstream Morgan mill, and each water box is equipped with an inlet, at least one cooler, at least one stripper, dryer and outlet what allows to obtain temperature (TUZ) - during laying of wire rod coils on the controlled cooling conveyor system - at the level between T= 760°C (AC3) and T = 800°C (AC1 ); then the wire rod in the form of coils is transferred onto the controlled cooling conveyor system comprising at least 10 sections, each having separate speed adjustment between 0.08-2.50m/s, where at least one fan intended for fast cooling of wire rod to the temperature T2=350-500°C is installed below at least two sections; moreover, above at least six sections cased with side walls, there are covers which, when lowered, create a tunnel allowing for heating wire rod at T2 temperature within a specified time (t2) not less than 60 s; after the heating process, the wire rod is cooled under atmospheric conditions down to the ambient temperature on not less than two sections of the conveyor.