<p>The first stage of modernization of the Continuous Casting Machine No 5 has been completed at the Magnitogorsk Iron & Steel Works electric steelmaking shop. These measures made it possible to reduce the duration of long scheduled preventive repairs, to increase the inter-repair interval of replacement equipment and boost the unit's productivity. A joint project was prepared for CCM No 5 modernization with the participation of technical specialists from MMK, Mekhanoremontny Kompleks LLC and SMC Zimag Metallurgical Service Magnitogorsk LLC. Following technical solutions selected to increase equipment reliability and its technical service life were chosen</p><p>1. Reinforcing surfacing of the working surface of the vertical, radial and curvilinear sections of CCM's rollers</p><p>2. Modernization of bearing units, using a new type of bearings with increased wear resistance and modern contact seals</p><p>3. Replacement of obsolete mounted drives of all roller sections of CCM by gearboxes of gear pump type, with a centralised supply of grease to the gearbox</p><p>Cladding of rollers, completion of bearing units, assembly and adjustment of the upgraded CCMZ sections were performed at CRMO-3 of MRK LLC, with the participation of the quality and engineering service and the design and engineering department of MRK LLC. </p><p>These modernization measures will allow reducing the duration of planned preventive maintenance from 952 to 490 hours per year. In the period from July to December 2021 the first operational campaign of the modernised sections of the radial section was carried out. The overhaul interval of the first campaign was 2,418 heats, which is twice as long as the durability of the sections before modernisation.</p><p>The continuous slab double strand caster No 5 was introduced in June 2006. The capacity of the machine is about 1.5 million tonnes of billets per year, with the supplier being Uralmash Metallurgical Equipment. During the operation of CCM No 5, due to its design features, it was not possible to reach the desired production threshold as well as the durability of the equipment to levels declared by the supplier. After the reconstruction of the 2500 hot-rolling mill at LPTs-4 of MMK PJSC, it became necessary to supply it with a large volume of slab billets at CCM-5 of the electric steelmaking shop. Therefore, in 2020 it was decided to modernize CCM-5 in order to increase its production by improving the reliability of its main components. The increase in the maintenance periods of CCM-5 is an important condition for achieving the stated annual capacity of the electric steelmaking shop. Thanks to the measures taken it became possible to reduce the duration of long scheduled preventive maintenance, increase the inter-repair interval of shift equipment and increase the productivity of the unit.</p><p>Total investments in this project amounted to 400 million rubles. The expected economic effect from the implementation of the project will be at least 323 million rubles per year, with a payback period of 1.3 years.</p>
<p>The first stage of modernization of the Continuous Casting Machine No 5 has been completed at the Magnitogorsk Iron & Steel Works electric steelmaking shop. These measures made it possible to reduce the duration of long scheduled preventive repairs, to increase the inter-repair interval of replacement equipment and boost the unit's productivity. A joint project was prepared for CCM No 5 modernization with the participation of technical specialists from MMK, Mekhanoremontny Kompleks LLC and SMC Zimag Metallurgical Service Magnitogorsk LLC. Following technical solutions selected to increase equipment reliability and its technical service life were chosen</p><p>1. Reinforcing surfacing of the working surface of the vertical, radial and curvilinear sections of CCM's rollers</p><p>2. Modernization of bearing units, using a new type of bearings with increased wear resistance and modern contact seals</p><p>3. Replacement of obsolete mounted drives of all roller sections of CCM by gearboxes of gear pump type, with a centralised supply of grease to the gearbox</p><p>Cladding of rollers, completion of bearing units, assembly and adjustment of the upgraded CCMZ sections were performed at CRMO-3 of MRK LLC, with the participation of the quality and engineering service and the design and engineering department of MRK LLC. </p><p>These modernization measures will allow reducing the duration of planned preventive maintenance from 952 to 490 hours per year. In the period from July to December 2021 the first operational campaign of the modernised sections of the radial section was carried out. The overhaul interval of the first campaign was 2,418 heats, which is twice as long as the durability of the sections before modernisation.</p><p>The continuous slab double strand caster No 5 was introduced in June 2006. The capacity of the machine is about 1.5 million tonnes of billets per year, with the supplier being Uralmash Metallurgical Equipment. During the operation of CCM No 5, due to its design features, it was not possible to reach the desired production threshold as well as the durability of the equipment to levels declared by the supplier. After the reconstruction of the 2500 hot-rolling mill at LPTs-4 of MMK PJSC, it became necessary to supply it with a large volume of slab billets at CCM-5 of the electric steelmaking shop. Therefore, in 2020 it was decided to modernize CCM-5 in order to increase its production by improving the reliability of its main components. The increase in the maintenance periods of CCM-5 is an important condition for achieving the stated annual capacity of the electric steelmaking shop. Thanks to the measures taken it became possible to reduce the duration of long scheduled preventive maintenance, increase the inter-repair interval of shift equipment and increase the productivity of the unit.</p><p>Total investments in this project amounted to 400 million rubles. The expected economic effect from the implementation of the project will be at least 323 million rubles per year, with a payback period of 1.3 years.</p>
