Challenges of European roll Foundries in the Near Future.
L. Elizondo, M. Brandner, G.Kowarik. Challenges Eisenwerk Sulzau-Werfen, R&E Weinberger AG.
The European roll foundries, mostly family-owned small and medium-sized enterprises, are facing many different challenges of different nature, which require great efforts and investments to cope with this situation and at the same time pose...
This research investigated the effects of copper (Cu) and molybdenum (Mo) on the isothermal transformation behavior of high chromium cast irons. Two series of 15%Cr and 25%Cr cast irons with Cu and Mo contents of 1 and 2% each were produced by an induction furnace. Test pieces fixed to silica holder were austenitized at 1050 oC for 10 minutes and then quenched into a salt bath which was...
High Cr cast irons have excellent wear resistance because a large amount of chromium carbides is distributed in the matrix. Mechanical properties of the cast iron required for practical uses are generally obtained by the heat treatment. In order to get the guideline for the appropriate heat treatment, however, the transformation behavior must be understood in each cast iron. Since various...
The effect of carbon balance (Cbal), which is defined as the amount of carbon (C) dissolving in the matrix in an equilibrium state, on the microstructure and the abrasive wear behavior of heat-treated multi-component white cast irons for steel hot work rolls was investigated. The test specimens with a wide range of the Cbal value from -0.68% to +0.53% were prepared by altering Cr content in...
Work rolls used in hot rolling of steel suffer severe wear caused by combinations of adhesion, abrasion, rolling contact fatigue, thermal fatigue, and tribo-chemical corrosive attack. Depending on the specific wear mechanisms, damage of these rolls may include loss of material, surface, and subsurface cracking, as well as impairment of the surface finish. In this work, wear tests were...
Development of Newly Designed Materials for Coiler Roll
in Hot Strip Mill
Akio Sonoda1, Hyo-Gyoung Kang1, Hideaki Nagayoshi1, and Hidenor Era2
1FUJICO Co., Ltd., 1-110-10, Hibiki-machi, Wakamatsu-ku, Kitakyushu-city, Fukuoka, 898-0021, JAPAN
2Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu-city, Fukuoka, 804-8550, JAPAN
Abstract
It has been...
Research shows that the wear phenomenon has a ruinous impact on the world's energy expenditure which consumes 23% of the world’s energy. Erosion wear is a material loss process during which the material's surface is eliminated or destroyed. This incident has caused a significant problem with the blades and fans of turbines, pipes of the transport system, and many more. In this age, a...
There is a need to develop materials that have abrasive wear resistance in high-temperature environments. In previous research, the abrasive wear characteristics in a room temperature environment using a rubber wheel wear tester have been clarified. When considering adaptation to actual equipment, it is important to evaluate in an environment similar to the actual wear environment. Based on...
The manufacturing process of seamless steel tubes in hot rolling mills includes piercing, pushing and stretch-reducing of the tubes. Depending on the specific steel grade, the tubes are heat-treated and hot-straightened to achieve the predefined geometric specifications of the final product. As the strength of the tube steel increases, the rolls used in the straightening machines show greater...
Wear and Thermal fatigue (TF) cracking represent very important damage mechanism in hot rolls.
The tribological contact between the roll surface and the hot strip causes wear, characterized by the loss of materials, as well as deterioration of surface finishing. Friction also plays an important phenomenon affecting the surface quality of rolls. The authors’ experience learns that the...
oxidation behavior, thermomechanical fatigue, roughing mill work rolls, simulation, thermogravimetry, isothermal and thermo-mechanical fatigue, damage mechanisms
Delivering consistent product quality and optimizing processing conditions in a cold rolling mill requires a proper understanding of back up roll wear. This paper describes the development of an analytical wear model in rolling contact that integrates the contact mechanics of tractive rolling and Archard’s wear model. The model is developed for two facing cylinders. Then this model is expanded...
Back-up rolls (BURs) in cold and temper rolling mills often exhibit very inhomogeneous wear rates over their barrel length. Associated profiles have a large effect on local stress distribution along the BUR-WR (work roll) contact length, which may impact subsequent stages of BUR (sub)surface degradation, which in turn affects strip profile or flatness. A poor prediction of BUR profile loss,...
Understanding and investigating roll failures in the hot mill is a very complicated subject. Post-mortem analysis requires for precision insights and actual data of the rolling mill. It requires deep technical knowledge of the subject of rolls and the rolling process.
The present papers captures the journey into the investigation of Tata Steel’s Compact Strip Process (CSP) Back Up Roll ( BUR...
Additive manufacturing (AM) is a material-processing technique that is expanding rapidly, with applications in various fields such as repair technology under thin or thick deposits, or the development of complex shaped parts.
In this work, AISI HSS M4 thick deposits of various geometries (thin walls, bulk specimens, and large plate samples) are obtained from a Laser Metal Deposition (LMD)...
Additive manufacturing (AM), and in the particular laser cladding (LC), is a suitable technique for the manufacturing of composite coatings, allowing for a large variability in raw materials. In laser cladding, a stream of a powder, or a mixture of different powders, is fed into a focused laser beam while being scanned across a substrate, thus leaving behind a coating or object. Laser cladding...
The microstructure of steel affects its properties like yield strength and hardness that are critical for the quality of steel products. Typically, the microstructure is ex-situ analyzed by standard metallography or more advanced methods such as electron backscatter diffraction (EBSD). While the information gained is most comprehensive, drawbacks are low throughput and practical limitations of...
