The range of HSMs for the rolling of hot rolled coils has undergone significant changes in the last few decades with minimum thickness of the hot rolled strips has been decreased from 1.8 mm to 2 mm to 0.8 mm to 1.2 mm. The strips of such thickness were earlier produced only in the cold rolling mills.
اقرأ المزيد
4.2 Roll bonding Steel sticking on the roll, tail flicking or steel piling accidents cause the steel sticking on the roll. Treatment method: when the thickness of the roll is more than 3mm, the adhered strip needs to be turned off first. Check the surface of the roll body after the attached sheet metal is removed.
اقرأ المزيد
2.1.1. Roll Bite Zone From the measurements of work roll temperature in a roughing mill, Stevens et. al.1) estimated that the heat trans-fer coefficient (HTC) within the roll bite (zone 1 in Fig. 1) was 37.6kW/(m2K) during the first 30ms in the arc of con-tact and 18kW/(m2K) thereafter. These values of HTCs.
اقرأ المزيد
Continuous casting is the process through which molten metal is solidified into a "semifinished" slab which can then be rolled in the finishing mills. Using a continuous casting process, the stainless steel is produced for a wide variety of applications. The low casting temperatures as well as the chill mold and directional solidification result in a …
اقرأ المزيد
These costs can be significant – in fact, water-cleaning costs are typically higher than the cost of the lubricants themselves. SKF's range of solutions for hot rolling mills can help you meet the demands of increased productivity and quality in cost-effective ways. Our specialized bearings can handle the high loads and harsh environments ...
اقرأ المزيد
Cooling water. Cooling water refers to streams that are used to dissipate excess heat from steel products and associated machinery. Cooling applications account for the bulk of water used in a steel plant, and include contact cooling in hot and cold rolling processes, off-gas …
اقرأ المزيد
In fact, in a steel plant, water carries out a number of functions. Major functions of water in a steel plant are given below. Most of the water used in a steel plant is for cooling. Examples are coke quenching, cooling of blast furnace shell, oxygen lance in converter, cooling in continuous casting machines and hot rolling mills.
اقرأ المزيد
Contemporary controlled rolling technology with accelerated cooling is assimilated at the Azovstal Metallurgical Combine, used in production of plate intended for manufacturing gas and oil pipelines of considerable diameter. General characteristics are provided for the SMS-Demag accelerated controlled cooling unit in the plate workshop …
اقرأ المزيد
This steel production facility is a retained mandrel hot roll mill with a walking beam reheat furnace. Cooling water is reused in the steel production. Products produced at the facility include: • Oil country tubular goods (OCTG – 2/3 of production) • Line pipe • Standard pipe • Coupling stock • Mechanical tube
اقرأ المزيد
In this work, the relationship between the friction and wear of a work roll grade high speed steel (1.55% C, 7.70% Cr, 4.90% V, 2.00% Mo) and oxidation was investigated at 400, 500 and 600°C for ...
اقرأ المزيد
Wastewater from the coke making process is some of the more difficult wastewater to treat at integrated steel mills. . Salt Creek Technologies, Inc. 188 Industrial Drive, Suite 14C, Elmhurst, IL 60126 630-530-2808, FAX: 630-626-0684, info@saltcreektech. A summary of wastewater sources generated at steel mills and treatment technologies.
اقرأ المزيد
Hot rolling rollers often work in a high-temperature environment of 700°C to 800°C. They are in contact with the hot steel billet and need to withstand strong rolling force. At the same time, the surface has to withstand the strong wear of the rolled material and is repeatedly heated by the hot-rolled material and cooled by cooling water.
اقرأ المزيد
4.2.3.1.1 Roll Mills. The roll mill is the simplest batch mixing equipment. The principal design consists of two horizontal rolls, usually of equal size, arranged side by side and rotating toward each other at different speeds. The ratio of the peripheral speeds of the rolls, known as friction ratio, ranges from 1 to 2 but is usually around 1.2 ...
اقرأ المزيد
The objective of a wire rod mill (WRM) is to reheat and roll steel billets into wire rods. Wire rods are normally rolled in a high-speed rolling mill, where steel temperature is above 1,000 deg C, maximum speed of rolling can go up to 140 metres per second (m/s) and coils of wire rod produced can be up to 2.5 tons of weight and up to 10 ...
اقرأ المزيد
The present study presents an overview of the qualitative and quantitative characteristics of the contact cooling water cycle at a steel hot rolling mill, where the cooling water circuit is fed with make-up water from ... The Chemical Treatment of Cooling Water. New York: Chemical Publishing, New York, 1974:19-110
اقرأ المزيد
SKF's range of products, services and solutions for hot rolling mills help you maximize quality, productivity and uptime.
اقرأ المزيد
The present study presents an overview of the qualitative and quantitative characteristics of the contact cooling water cycle at a steel hot rolling mill, where the cooling water …
اقرأ المزيد
In a hot strip mill, the hot rolled coils are produced from slabs through hot deformation and subsequent cooling with water on a run out table. In conventional rolling, the starting slab thickness is around …
اقرأ المزيد
subsequent heating to 840 – 860°C, cooling to 650°C, heating to 840 – 860°C and cooling to 350 – 400°C there austenite grain refinement. With provision of three heat treatment cycles differences in grain size are overcome. The microstructure after the third cycle is sorbite + carbide.
اقرأ المزيد
Cooling water discharges comprise the largest percentage of steel mill effluents and are usually 10°-15°F warmer than the water withdrawn from the source of supply. The rise in temperature is the only change in water used for indirect cooling and is usually not significant if the effluent is discharged into a reasonably large stream.
اقرأ المزيد
The Area of Contact (roll and Strip) between the hard work roll surface and the softer steel strip surface is where friction is created, deformation occurs and heat is generated. The "Area of contact" is defined by the strip width in the transverse plane and the circumferential "Arc of Contact" (AoC) between the roll and strip
اقرأ المزيد
The Lechler SELECTOSPRAY® roll cooling system is the industry standard for selective roll cooling in the rolling of flat steel, aluminium and other non-ferrous strip. Advanced design and engineering capabilities with more than 400 systems and 1000 headers designed and manufactured. In depth application experience and process knowledge.
اقرأ المزيد
4.1 Improvement of roll cooling device. In order to improve the utilization efficiency of cooling water and enhance the cooling effect of cooling water, the method of improving the performance of the roll cooling device can be adapted to prolong the service life of the roll. The rolling mill will generate a lot of heat during the rolling process.
اقرأ المزيد
models were used to predict temperatures and thermal stresses/strains in the roll under various cooling conditions, thus examining the efficiency of the existing roll cooling …
اقرأ المزيد
The roller from this steel after water drip cooling at H = 0.35 m contains up to 15% pearlite even at a distance h = 2.5 mm from the surface, wheres the concentration of pearlite in the hardened layer of mill rollers should not exceed 5% . The roller from steel 50KhN with diameter 0.2 m has a hardened layer with a thickness of about 12.5 mm ...
اقرأ المزيد
High-carbon high-speed steels (HSS) are very abrasion-resistant materials primarily due to their high hardness MC-type carbide and high hardness martensitic matrix. The effects of quenching and tempering treatment on the microstructure, mechanical properties, and abrasion resistance of centrifugal casting high-carbon HSS roll were …
اقرأ المزيد
The first major operation in the hot rolling mill is the reheating of s lab or billet. There is a lot to be. said about reheating furnaces, both about their technology and their exploitation. The ...
اقرأ المزيد
the final heat treatment, when the active surface layer is formed. It defines, to a great extent, the quality of the finished mill roll. Significant unrelieved stresses develop in a mill roll during the accelerated cooling modes (quenching in water), which are characteristic for the final heat treatment. These stresses can greatly affect
اقرأ المزيد
(1) Improve the cooling water of the work rolls. The temperature of the rolls is controlled below 80°C, which is more than 10°C lower than that before the …
اقرأ المزيد
Cooling water is a critical commodity in the steel industry due to the very high heat generation and energy transfer in blast furnaces, basic oxygen and electric arc …
اقرأ المزيد