EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

This paper provides a short overview of recent steel market developments considering the global steel oversupply and recessions in some emerging economies. The enormous Chinese overcapacity combined with their lower demand is a major reason for the deterioration on the steel market. The general steel demand also declines due to slow growth or even reductions in technology fields like ship...

Actual improvements in rolling e.g. in relation to power requirements, energy consumption and final material properties demand powerful and robust simulation tools for process optimization, pre-setting calculations or automation. The semi-industrial rolling equipment of the institute of Metal Forming of TU Bergakademie Freiberg is used during the period of simulation development as well as for...

The article focuses on the hot rolling of large diameter bars (round bars of 500mm) using either continuous casted blooms or ingots. This kind of product is often manufactured by forging an ingot. The forging process is able to applied large deformation and thus to ensure a good metallurgical microstructure (small grain size, no porosities or micro-cracks…). However, this process has two main...

The need for more effective and flexible roll-gap lubrication technologies in hot- and cold-rolling mills is steadily increasing due to ever-greater requirements placed on the rolling process and the final products. This paper focuses on two innovative technologies for highly efficient roll-gap lubrication for hot and cold rolling. For cold rolling mills, MQL® (a new generation of roll gap...

An electrical steel with 1.24wt.% Si was hot rolled, hot band annealed and cold rolled (CR) to a rolling reduction of 78%. The as-CR specimen was subsequently annealed at the temperature range between 500°C and 900°C, and Vickers microhardness tests was performed on these specimens to determine the recrystallization (RX) temperature. Recrystallization was found to start at the temperature of...

The many new steels being developed to address the light-weighting car initiative put new demands on the thermal processing equipment in order to obtain the desired mechanical properties. Higher annealing temperatures, faster cooling rates, tighter control of the cooling curve, better strip shape and more uniform tempering are needed. Interestingly, many of these demanding requirements are...

The performance of a flat product rolling mill is directly related to the design concept and performance of the upstream reheating furnace(s), both in terms of productivity but ever more importantly for final rolled quality and yield increase purposes. Many such production plants are also located near residential areas and thus as very demanding emissions reductions laws are set, steel...

Beside computational intensive methods like CFD or FEM, reduced modelling approaches for technical process may be more practical, especially in production environments. A modelling approach, which can be applicable for industrial processes to predict the heating of products, semi-finished materials or raw materials, will be shown. To derive such models many different approaches, depending on...

The increased demand for higher precision and lower tolerances of rolled steel products poses an enormous challenge for the development of roll materials. New high speed steel grades **HSS** offer a solution in many cases for hot strip mills, strip casters or plate mills because of their extreme wear and heat resistance as well as superior surface properties. For ***early roughing...

The target of this work has been to in detail measure the conditions inside the roll gap during hot and cold rolling. For this purpose rolling was done using an instrumented work roll. The purpose was to measure contact length, contact force distribution, friction coefficient and heat transfer coefficient. The work roll used three contact sensors, two for measuring the contact loads and one...

In this work, the use of a low-carbon steel AISI 1005 (Wr. N. 1.0303) is proposed as a substitute of CuZn39Pb3 brass in order to produce fashion accessories by hot forming. The heating process of the billets for hot forming has been carried out at 1050°C through a single heating step inside an induction furnace or by double step inside muffle and induction furnaces. The surface quality of the...

Muffle furnaces are most often used in wire drawing mills. In most cases, protective gas(es) is fed into the muffle tube. This shielding gas can be hydrogen, nitrogen, cracked ammonia or endogas. Some of these gases are very aggressive and will shorten the life of the muffle tubes significantly. In the annealing furnaces, the temperature is usually between 800 and 1,120°C. These aggressive...

In order to optimize the conduction of steel billets reheating furnaces, advanced multivariable process control techniques are needed so as to guarantee a suitable handling of all furnace conditions. The final goal is the achievement of energy efficiency while preserving product quality: a profitable tradeoff between energy saving, environmental impact decreasing and throughput maximization...

Louisville | Cincinnati | Evansville | Columbus | Indianapolis Improving Reliability for Steel Mill Furnace Rolls Author: Jeremy Rydberg Atlas was approached by a major steel manufacturer and asked to develop methods to improve overall reliability of steel mill furnace rolls. To accomplish this it was determined we would need to develop methods to inspect new, used and failed...

3D-Measurements for slabs and heavy plate are now available and close the gap in the production chain. The measuring systems described in this presentation must be seen as high-tech solutions in the field of casting and rolling technology. The measuring systems were developed taking into consideration the harsh casting and rolling mill environment in which they are to be used, with the aim of...

For demands of production increasing of advanced high strength steel (hereinafter AHSS), steel manufacturers face short production capacity of pickling line. Primetals Technologies Japan, Ltd (herein after PTJ) have proposed *i* Box pickling tank to improve production capacity, which is most advanced, maintenance easy and saving energy. Since *i* Box pickling tank need storage tanks of acid...

Primetals Technologies had developed a new mash seam welder (Cross Seam Welder, CSW) based on MSW features including low cost and compactness, enhancing its compatibility with Continuous Rolling of Steel Sheets at Thicknesses up to 6.5 mm. The first order and second order for the CSW were received form JFE Steel Corporation, where they were installed in the Continuous Pickling Line. These...

Pickling lines are often considered as a bottleneck of steel production. Increasing the throughput has been the declared goal of many research projects. Yet, high quality pickling results depend on a complicated mixture of constraints like careful choice of pickling speed, suited entry temperature and a good estimate about how many scale resides on the strip surface. In this paper, a technique...