Retained austenite in the cracking process of steel on the working rolls of the cold sheet rolling mill

1992 ◽  
Vol 63 (11) ◽  
pp. 500-503 ◽  
Author(s):  
Jerzy Pacyna
Keyword(s):  
Rolling Mill ◽  
Retained Austenite ◽  
Sheet Rolling ◽  
Cracking Process

scholarly journals Reasonability to use device for making horizontal wedge thrust of rolling stand

2018 ◽  
Vol 170 ◽  
pp. 03011 ◽  
Author(s):  
Viktor Artiukh ◽  
Vladlen Mazur ◽  
Sergey Kargin ◽  
Nikolay Bushuev
Keyword(s):  
Rolling Mill ◽  
Thick Sheet ◽  
Technical Solution ◽  
Tube Rolling ◽  
Sheet Rolling ◽  
Iron And Steel ◽  
Rolling Mills ◽  
Contact Surfaces ◽  
Iron And Steel Works ◽  
Work Rolls

Necessity and reasonability to use gapless connection between contact surfaces of lining straps of work rolls chocks and facing strips of housings (inner lining straps of back-up rolls chocks) to reduce dynamic horizontal forces during rolling and increase durability of equipment are considered. Technical solution is described on base of roughing reversing rolling stand of thick sheet rolling mill 3000 of PJSC ‘ILYICH iron and steel works’ (Mariupol city, Ukraine) which can be used on most heavy loaded sheet and tube rolling mills.

scholarly journals Method for calculation the modes of strips cold rolling on multiple-stand rolling mill ensuring cost reduction of sheet rolling shop production. Report 1

2019 ◽  
Vol 62 (7) ◽  
pp. 511-516
Author(s):  
A. I. Bozhkov ◽  
D. A. Kovalev ◽  
V. S. Potapov ◽  
R. I. Shul’gin
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Surface Defects ◽  
Optimization Method ◽  
Rolling Process ◽  
Optimization Criterion ◽  
Operating Conditions ◽  
Sheet Rolling ◽  
Advantages And Disadvantages ◽  
Conditional Optimization

A method for calculating the modes of strips cold rolling on multiple-stand (reversing) rolling mill is considered providing minimum power consumption with maximum process stabilization at high speeds and obtaining the given quality of cold-rolled strips (minimum probability of surface defects, compliance with thickness tolerances and flatness requirements of the used standards). The problem is solved using the conditional optimization method. As an optimization criterion, it is proposed to use the total energy expenditure spent on the rolling process, as conditions – technological and structural limitations on the rolling parameters and conditions of strips stability to breaks and surface defects formation. The decision to develop this innovative method is due to the fact that a large number of existing approaches to calculation and design of rolling modes have visible advantages and disadvantages. In many cases, the researchers are trying to take into account several requirements that ensure stability of rolling process, its quality, the equipment operating conditions, reduction of energy consumption, metal, auxiliary materials and the specified (maximum) mill productivity. However, some of these requirements can be contradictory and the best one will be the mode that with a high degree of probability guarantees the fulfillment, in a certain proportion, of the entire set of requirements. Therefore, such calculation method is the presented in this article. Calculation of the cold rolling regimes was limited to selection and distribution of the crimping along the cages (passages in the reversing mill). Also, the strip strains are selected in the intercellular spaces, on the decoiler and coiler, and in setting the speed wedge in a particular system of constraints imposed on the input and output process variables as a function of the adopted optimality criterion. As it was noted earlier, the problem was solved with the help of the conditional optimization method with specification of the optimization criterion.

scholarly journals METHOD FOR CALCULATION THE MODES OF STRIPS COLD ROLLING ON MULTIPLE-STAND ROLLING MILL ENSURING COST REDUCTION OF SHEET ROLLING SHOP PRODUCTION. REPORT 2. AN EXAMPLE OF THE METHOD PRACTICAL USE ON FOUR-STAND ROLLING MILL 1400

2019 ◽  
Vol 62 (9) ◽  
pp. 667-673
Author(s):  
A. I. Bozhkov ◽  
D. A. Kovalev ◽  
V. S. Potapov ◽  
R. I. Shul’gin
Keyword(s):  
Energy Consumption ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Surface Defects ◽  
Specific Energy Consumption ◽  
Optimization Method ◽  
Rolling Process ◽  
Rolling Speed ◽  
Total Energy Consumption ◽  
Sheet Rolling

The second part of the paper describes the method practical use on four-stand rolling mill 1400. When rolling the chosen typical sizes, the task was to determine the specific rolling mode, which will ensure a minimum of the total specific energy consumption at the maximum rolling speed, maximum process stabilization (minimum breaks, idle times, etc.) and obtaining the specified quality of the rolled strips (no surface defects, meeting the thickness and flatness requirements). It was achieved by including the above requirements in the constraint system with respect to the determined rolling modes for the selected strip sizes. For example, ensuring a given (maximum) performance for a specific size and brand of a strip is equivalent to realizing a gi673 ven (increased) rolling speed in the absence of unscheduled downtime occurring in emergency situations (in particular, in strip breaks). The speed limit depends on the power of engines, which is included in the complex of structural and technological limitations. The obtained examples, given in the article, have shown that the use of the method leads to fulfillment of all the specified requirements, which, in turn, ensures a reduction in production cost and an increase in the mill’s productivity. The calculation of the cold rolling modes was reduced to selection and distribution of the crimping along the stands (passages – in the reversible mill) and to a choice of specific strip tension in the interstand spaces, on decoiler and coiler, and in setting the wedge of speeds in a particular system of constraints imposed on the input and output process variables as a function of the adopted optimality criterion. The task was solved using the conditional optimization method, through the specification of the optimization criterion. As such criterion, the total energy consumption of the rolling process was used, as requirements – technological and design constraints on the rolling parameters and conditions for strip stability to breaks and to formation of rolls surface defects (“brews”, “chippings”, etc.), as well as to strip breaks.

Controlled Rolling and Controlled Cooling Technology of Fe-C-Mn-Si Multiphase Steel

2013 ◽  
Vol 377 ◽  
pp. 107-111
Author(s):  
Zhuang Li ◽  
Di Wu ◽  
Ming Fu Shao
Keyword(s):  
Mechanical Properties ◽  
Rolling Mill ◽  
Retained Austenite ◽  
Controlled Rolling ◽  
Granular Bainite ◽  
Trip Effect ◽  
Controlled Cooling ◽  
Hot Rolling Mill ◽  
Cooling Technology ◽  
Multiphase Steel

In the present paper, controlled rolling and controlled cooling of Fe-C-Mn-Si multiphase steel was conducted by a laboratory hot rolling mill. The results show that ferrite (grey), granular bainite (black) and retained austenite (white) and/or MA islands (white) are observed in a color etched LOM micrograph. The presence of the retained austenite is confirmed by SEM observation. Controlled rolling and controlled cooling technology contributes to the improvement of the microstructure. Excellent mechanical properties for Fe-C-Mn-Si multiphase steel are attributed to the TRIP effect of the stable retained austenite.

scholarly journals Mathematical Modeling of Steel Temperature on a Hot Sheet Rolling Mill

2020 ◽  
Vol 18 (4) ◽  
pp. 24-31
Author(s):  
Sosedkova M.A. ◽  
◽  
Grigorenko A.S. ◽  
Radionova L.V. ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Rolling Mill ◽  
Sheet Rolling ◽  
Steel Temperature

Analysis of interconnections between technical systems on hierarchically connected technological levels of steel sheet production by hot rolling

2020 ◽  
Vol 76 (8) ◽  
pp. 847-855
Author(s):  
E. N. Shiryaeva ◽  
M. A. Polyakov ◽  
D. V. Terent'ev
Keyword(s):  
Hot Rolling ◽  
Systems Analysis ◽  
Rolling Mill ◽  
Steel Sheet ◽  
Technological System ◽  
Necessary Condition ◽  
Rolled Sheet ◽  
Technological Systems ◽  
Hot Rolling Mill ◽  
Technical Systems

Complexity of modern metallurgical plants, presence of great number of horizontal and vertical interactions between their various structural subdivisions makes it necessary to apply a systems analysis to elaborate effective measures for stable development of a plant operation. Among such measures, digitalization of a plant is widespread at present. To implement the digitalization it is necessary to have clear vision about links at all the levels of the technological system of a plant. A terminology quoted, accepted in the existing regulatory documents for defining of conceptions, comprising the technological system. It was shown, that the following four hierarchical levels of technological systems are distinguished: technological systems of operations, technological systems of processes, technological systems of production subdivisions and technological systems of plants. A hierarchical scheme of technological systems of hot-rolled sheet production at an integrated steel plant presented. Existing horizontal and vertical links between the basic plant’s shops shown. Peculiarities of flows of material, energy and information at the operation “rolling” of the technological system “hot rolling of a steel sheet” considered. As a technical system of the technological process of the hot rolling, the hot rolling mill was chosen. A structural diagram of the hot rolling mill was elaborated, the mill being consisted of reheating furnaces, roughing and finishing stand groups, with an intermediate roll-table between them, and down-coilers section. Since the rolling stands are the basic structural elements of the hot rolling mill, structural diagrams of a roughing and a finishing stands were elaborated. Results of the systems analysis of the technological and technical systems, hierarchically linked in the process of steel sheet hot rolling, can be applied for perfection of organization structure of the whole plant, as well as for elaboration mathematical models of a system separate elements functioning, which is a necessary condition for a plant digitalization.

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