scholarly journals Improving the technology of rolling rail steels by a comprehensive optimization parameter

2021 ◽  
Vol 64 (11) ◽  
pp. 802-814
Author(s):  
A. A. Umanskii ◽  
A. B. Yur'ev
Keyword(s):  
Structural Steel ◽  
Rolling Mill ◽  
Desirability Function ◽  
Steel Mill ◽  
Optimization Criteria ◽  
Grinding Balls ◽  
Rolling Ball ◽  
Optimization Parameter ◽  
Material Conservation ◽  
Rolling Mode

The authors have developed a technique for improving the rolling modes of rail steels based on a complex optimization parameter. The technology of rolling rail profiles in the roughing stands of rail-and-structural steel mills and the technology of rolling ball blanks and grinding balls from the rejection of continuously cast blanks of rail steels are selected as the methodology objects. The generalized optimization parameter is the generalized Harrington desirability function, which depends on the partial desirability indicators according to the criteria of energy efficiency, quality of rolled products, material conservation and mill productivity. The share of influence of the listed partial optimization criteria on the generalized desirability function is taken into account by using weighting coefficients. Justification of the coefficient values is based on the results of a comparative analysis of reserves for reducing costs or losses in value terms. An algorithm for applying the technique has been developed. The analysis and generalization of the available initial data and additional research were carried out as a part of the first block. These studies are aimed at obtaining justified analytical dependencies of particular optimization criteria and measured rolling parameters. The second block is justification of the specific direction of rolling modes, the choice of which is carried out on the basis of checking the compliance of boundary conditions. The third block includes development of the parameters of the new rolling mode and assessment of its applicability and effectiveness. The fourth block involves pilot testing of a new rolling mode in the conditions of an existing rolling mill and if it is necessary, adjusting the methodology for determining the forecast values of the measured indicators. With the use of the developed methodology, the modes of rolling of railway and sharp rails in the roughing stands of universal rail-and-structural steel mill of JSC “EVRAZ ZSMK” were improved, and the mode of rolling grinding balls from the rejection of rail blanks at the cross-screw rolling mill of JSC “GMZ” was changed. There is a significant improvement in the quality, technical and economic indicators, which indicates the effectiveness of the developed methodology.

scholarly journals Secondary steel mill furnace performance.

2018 ◽  
Vol 7 (2.6) ◽  
pp. 102
Author(s):  
Yogesh Chandra Gupta ◽  
Kamal Bansal ◽  
S N.Sriniwas
Keyword(s):  
Rolling Mill ◽  
Heating Furnace ◽  
Steel Mill ◽  
High Data ◽  
Furnace Performance ◽  
Steel Sector ◽  
The Cost ◽  
Very High

Energy in a steel re-rolling mill is mainly consumed in furnaces. Therefore, furnace performance is very important and its contribution in the cost of product is very high. Data has been collected for two different furnaces in Stackle mill and analyzed for performance of furnace. In this paper, effect of furnace performance on secondary steel sector is analyzed. These data about performance is collected on Walking beam furnace in Stackle mill and Re-heating furnace.

Roll-Force and Torque Coefficients for Hot-Strip Steel Mill

1960 ◽  
Vol 82 (3) ◽  
pp. 683-688
Author(s):  
B. N. Garudachar ◽  
H. A. Peterson
Keyword(s):  
Rolling Mill ◽  
Roll Force ◽  
Steel Mill ◽  
Strip Rolling ◽  
Steel Rolling ◽  
Strip Steel ◽  
Roll Torque ◽  
Hot Strip ◽  
Flat Strip ◽  
Cold Mill

This paper provides results of an analytical and computer investigation to determine the numerical coefficients involved in the roll-force and roll-torque equations pertaining to a single stand in a multistand, tandem, steel rolling mill. To the authors’ knowledge, such information has not appeared in the literature to date. The coefficients for a typical hot mill are compared with those obtained for a typical cold mill. The principles of gage control are discussed. The theories on flat-strip rolling are reviewed briefly.

The new ball-rolling mill of EVRAZ NTMK – new possibilities for customers

2020 ◽  
Vol 76 (6) ◽  
pp. 602-608
Author(s):  
К. А. Ulegin ◽  
K. N. Shvedov ◽  
А. N. Borodin ◽  
V. Yu. Rubtsov
Keyword(s):  
Rolling Mill ◽  
Investment Project ◽  
Production Quality ◽  
Automation System ◽  
Technological Parameters ◽  
Efficient Operation ◽  
Grinding Balls ◽  
Ball Rolling ◽  
Production Section ◽  
On Line

In view of increase of ferrous and nonferrous ores mining, the need for grinding balls, used for the ores grinding in the process of concentration, is also increasing. Description of technical solutions, realized at accomplishment of an investment project at JSC EVRAZ NTMK, presented. The investment project on the technical modification of the rail and beam shop included construction of the new ball-rolling mil further to production of steel grinding balls. The new ball-rolling mill, which was put into operation in 2018, has a possibility to produce ball of diameter from 60 up to 120 mm with hardness up to 5th group. The mill is equipped by an automation system of the process and balls stocking control. The ball production section comprises a walking beams heating furnace with automated heating modes to ensure energy-efficient operation; automated hot rolling mill for production grinding balls of 60 ‒ 120 mm diameter; balls thermal treatment line, including temperature leveling facility, quenching machine and tempering furnace. The system of the process automation enables to trace on-line all the technological parameters for production quality products, parameters of the environment to increase the energy efficiency of the section, and control system to create safety working area at the section. Within a year after the ball-rolling mill commissioning, the whole nomenclature series of balls was mastered and the passport productivity at each profile was reached. The maximum mill productivity obtained was 22 t/h. The JSC EVRAZ NTMK mill of grinding balls of 60 ‒ 120 mm diameter production meets all the modern market requirements.

Study on Milling Periods on the Iron Mill Scale Particle Size and Properties

2012 ◽  
Vol 626 ◽  
pp. 1001-1005 ◽  
Author(s):  
Mohd Zaki Ruhiyuddin ◽  
Che Pa Faizul ◽  
Darus Murizam ◽  
A.R.M. Nazri
Keyword(s):  
Particle Size ◽  
Milling Process ◽  
Optimum Size ◽  
Steel Mill ◽  
Mill Scale ◽  
Rolling Ball ◽  
Scale Properties ◽  
Scale Particle ◽  
Average Size ◽  
The Relationship

The relations between the milling periods with the iron mill scale particle size have been studied. Iron mill scale has been chosen for this research due to the nature of itself, as a by-product. From this research, the average optimum size for the final iron mill scale particle size intended to produce is at 300 μm. Raw iron mill scale received from the industries was in the form of chip with the average size of 10 mm across and 1.5 mm thickness. Three different samples from three different steel mill companies have been used for this study. Rolling ball mill has been used to mill the iron mill scale with two different milling periods, which were two hours and six hours. After the milling process, the iron mill scale was sieved using sieving machine to a few specified grating sizes. Weight of each sample collected from each grating size was calculated in order to get the percentage of the particle size distribution of the iron mill scale after the milling process. Sample collected from Steel Mill 1 (SM1) and Steel Mill 3 (SM3) showing finer particle size produced after the milling period of six hours as compared to two hours. However sample from Steel Mill 2 (SM2) showing different trend of particle size collected as compared to SM1 and SM3. Coarser particle size was collected after the milling periods of six hours as compared to two hours. Characterization process have been conducted to all mill scale samples from each steel mill company in order to determine the relationship between the mill scale properties and the result gathered after the milling process.

Development of Advanced Calibrations for Point and Wing Rails in a Universal Rail and Structural Steel Mill

Metallurgist ◽  
2019 ◽  
Vol 63 (5-6) ◽  
pp. 566-572
Author(s):  
S. V. Smetanin ◽  
A. B. Yur’ev ◽  
V. V. Dorofeev ◽  
V. N. Peretyat’ko ◽  
A. V. Dobryanskii
Keyword(s):  
Structural Steel ◽  
Steel Mill

scholarly journals MODELING OF A SYSTEM FOR AUTOMATIC REGULATION OF THE TENSION MODE IN THE ROUGHING GROUP OF STANDS OF A CONTINUOUS SECTION MIL

2021 ◽  
pp. 67-73
Author(s):  
Ivan Marynych ◽  
Olga Serdiuk
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Control Systems ◽  
Automatic Control System ◽  
Rolling Mill ◽  
Rolling Speed ◽  
Automatic Regulation ◽  
Automatic Control Systems ◽  
Rolling Mode ◽  
Uneven Heating

The subject of the research is automatic control system modeling features for tensioning of stands roughing group, which takes into account changes in the rolling speed at exit of the previous stand and entrance to the next stand. Control systems for high-speed rolling on section mills are the most critical systems, since the trouble-free operation of rolling mill largely depends on their work. Rolling speed control is understood to mean tension regulation in the roughing group of stands and stabilization of the rolling loop in the finishing groups. The influence of such technological factors as uneven heating of blanks, change in the crimping mode in stands, etc. leads to the appearance of tension or back-up forces, deviation of rolled loop from the specified values. Tension rolling, in contrast to loop rolling, is a stable rolling mode. However, (at significant values of tension in the rolled products) such a rolling mode leads to different thicknesses of the finished product. The loop rolling mode is an unstable mode and is impossible without automatic control systems. Both in the tension rolling mode and in the free rolling mode with a loop, it is necessary to study automatic control systems in order to determine the possibilities of compensating for disturbing influences and obtaining rolled products of the given accuracy. Therefore, the main task of the automatic control system is to maintain the rolling mode with the lowest possible tension. To achieve this goal, direct control of the tension of the rolled strip with modern technical means is rather difficult, and the operation of tension control systems is based on indirect methods of measuring it, and the study of the system efficiency is reduced to modeling the process itself. The developed model consists of three stands and two inter-stand spaces, since it takes into account changes in rolling speed at the exit of previous stand and the entrance to the next stand. It is due to this that adequate simulation results are obtained that are close to the real rolling process. Keywords: automation, rolls, stand, inter-stand spacing, modeling, loop tension, rolling mill, roughing group.

Advanced Techniques for Rolling Mill Gearing

1973 ◽  
Vol 95 (4) ◽  
pp. 1101-1107
Author(s):  
G. Henriot
Keyword(s):  
Rolling Mill ◽  
Steel Mill ◽  
Advanced Technique ◽  
Steel Rolling ◽  
Rolling Mills ◽  
Conventional Steel ◽  
Manufacturing Operations ◽  
Marine Propulsion

This paper explains some of the problems arising from the increased speed and horsepower being applied to modern steel rolling mills. To deal with these problems techniques have been adopted which have already been used in cement mill and marine propulsion gearing. The use of harder materials, including case carburized steels is the primary recommendation. A modern steel mill operating in Holland is used as a basis for comparing the “advanced technique” gearing with conventional steel mill gearing. The paper also includes a brief description of some of the manufacturing operations which are unique to this type of gearing.

scholarly journals Development of Structural Steel Containing 3÷5 wt% Al with Microlaminated Microstructure

2017 ◽  
Vol 62 (4) ◽  
pp. 2309-2315
Author(s):  
B. Garbarz ◽  
M. Adamczyk ◽  
B. Niżnik-Harańczyk
Keyword(s):  
Structural Steel ◽  
Rolling Mill ◽  
Lamellar Microstructure ◽  
Total Elongation ◽  
Mechanical Processing ◽  
Controlled Cooling ◽  
Final Microstructure ◽  
Basic Parameters ◽  
Cooling Technology ◽  
Better Than

AbstractThe aim of this work was to develop basic parameters of hot rolling and controlled cooling technology allowing to obtain the microlaminated (lamellar) microstructure in a lean-alloy structural steel containing 3÷5 wt % Al. Thermo-mechanical rolling tests of two experimental steels were carried out in a semi-industrial line comprising a one – stand reversing rolling mill. The final microstructure of the specimens subjected to rolling in theγ+αstability region characterised with the microlaminated morphology composed of lamellae of ferrite with thickness down to 1 μm or less and lamellae or grains of phases developed during transformation of the austenite. Determined parameters of the thermo-mechanical processing allowed to achieve very attractive mechanical properties of the experimental steels: tensile strength over 1.0 GPa and ductility level (total elongation) better than 15%.

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