EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

The paper describes the converting to a new generation of descaling nozzles in a conventional hot strip mill for steel. There are descaling stations behind the reheating furnace, on the roughing mill stands and in front of the finishing mill. Before the converting, there had been three high pressure pumps in operation to supply the descaling stations. The new descaling nozzles had been tested...

In June 2010, after almost three years of intensive preparation work and intense technical discussions, PRIMETALS TECHNOLOGIES (PT) received an order from Allegheny Technologies Incorporated (ATI) to design, engineer and supply a new, fully integrated hot-rolling mill on a process-turn-key basis which included a water treatment plant. PRIMETALS successfully executed this project by using the...

IMS Messsysteme GmbH has developed the first width measurement system based on radar technology for hot rolling mills. In contrast to laser radiation or light, radar waves are insensitive to steam and dust. Therefore, the system allows for width measurement under harsh environmental conditions, where the use of other measurement technologies is difficult or not possible at all. As the...

Lubrication is a key parameter for improving the finishing mill process in hot rolling. The lubrication changes the contact interface between the work rolls and the hot strip. The lubrication can reduce the rolling force, the rolling torque, the energy consumption, the work rolls consumption and the work rolls degradation. Lubrication is also a lever to optimize finishing mill capability. The...

Yield and economy during hot rolling of flat products depend on developing high capacity components fulfilling further increasing customers demands for cost and resource effective production of steel strip and plate material. The paper gives an overview of the latest developments for high capacity components and tools of SMS group for conventional hot strip mills, CSP® plants and heavy plate...

To decrease time in defect crisis solving in roughing mill in ArcelorMittal Dofasco, a very robust vision system, RollScope, has been installed in stand in front of lower roll. The RollScope developed by CRM allows to take images of roll surface using a water column to avoid vapour and waste disturbances. This water column acts so as a guide light resulting in very good quality of images of...

In the field of down coiler technology in hot strip mills PRIMETALS Technologies has developed new innovative products which remove a head-ache by substantially simplifying operation and maintenance work and considerably reducing operation and maintenance costs. Contrary to conventional wear plates where the passing strip always cuts into the plates along the same line, wear on Primetals’...

Pair Cross mill(hereinafter PC mill) was developed widely to control the shape and crown of rolled strips for high productivity and saving energy. Recently, the demand for harder and thinner hot rolled strip, such as high strength steel or dual phase type high strength steel, has been increasing. In such production for harder and thinner hot rolled strip, higher reductions and larger rolling...

Threading is a critical phase in hot rolling both in the finishing and the roughing mill. To avoid threading refusals which cause loss of productivity and steel yield, some constrains are applied on the process: no lubrication or only on the strip body, limitation of thickness reduction, high slab temperature at the furnace exit… However, we had no means to estimate the threading risk for each...

Harder grades and better surface quality in longer rolling campaigns are the todays challenges in the hot rolling finishing mill. One of the key factors to achieve these objectives is the application of roll gap lubrication. It is essential to have a high performance, robust and highly efficient industrial lubrication installation. During the last years, also the economic aspect has gained...

For several decades, researchers did many hypotheses on the unique behaviour of ICDP in rear finishing stands. All those hypotheses will be discussed to make the clear link between the role of graphite, the mechanical and structural properties of ICDP that make this grade so unique. The aim is to highlight which properties are required to bear the specific degradation and incidents occurring...

Primetals Technologies Japan, Ltd. has developed the contact-type inline strip shape meter (Looper Shape Meter, hereinafter LSM) and has been marketing it for hot strip mills, where continuous inline strip shape measurement is long-awaited. The LSM consists of seven segmented rolls aligned in the width direction. Low hysteresis is obtained by applying torque meters at each segment. An internal...

Rolling of thin strips in a finishing mill of Endless Strip Production (ESP), Compact Strip Production (CSP) and Hot Strip Mill (HSM) with an outstanding thickness performance and stability has increased requirements to the tension and thickness control concept of finishing mills. To fulfill these requirements Primetals Technologies developed in the first step a new control concept for...