Purpose of the development: Obtaining of composite billets and products, including multi-layer and bimetallic ones (forming rolls, bimetal reinforcement, hearth steel-copper electrodes of arc furnaces, etc.).

Recommended application field: Metallurgy

Advantages over analogues: * In contrast to conventional methods of cladding, ESC LM enables to fuse outer surfaces of cylindric billets of practically any diameter. The clad layer thickness is determined exclusively by customer's requirements and can come to 20…100 mm and more. * ESC LM features high efficiency of the process which dozens of times surpasses that of conventional cladding methods and amounts to 200…800 kg/h and more, depending on sizes of parts clad and materials applied. * Durability of working rolls with a high-chromium layer clad by ESC LM method made for continuous wide-strip rolling mills is 2…3 times higher as compared with standard cast iron rolls.

The development stage readiness: Pre-production model is made

Description of the development:
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One of the most important conditions of producing a high-quality composite billet is minimizing change in chemical composition of clad layer metal by its dilution with metal of the billet being clad. Development of the new process of electroslag cladding with liquid metal (ECS LM) and a novel technological scheme ESR with two power sources (ESR DC) with use of a current-carrying mold has enabled to improve the billet technology. Special design of the current-carrying mold makes it possible to implement constant regulated rotation of the slag-metal melt in the process of bimetal billet cladding. This enables to align temperature and chemical composition of the metal pool in its cross-section, thus obtaining more uniform melting of the base layer and preset thickness of the cladding layer along its whole length. The study of isotropy of the chemical composition of composite billets of ESC LM rolls (samples were cut out from lower, middle and upper parts of the billet) showed almost uniform distribution of basic alloying elements both along the height and cross-section of the fused layer. Similar results were obtained in measurement of clad billets hardness, which proves isotropy of the properties of the working layer of composite roll billets. ESC LM technology was applied for fabrication of bimetal billets of 350 mm in diameter with a corrosion-resistant cladding of 316L austenitic steel and a base layer of 20GS steel for a 16 mm reinforcement bar. Metallographic examinations proved lack of any defects (laminations, cracks, slag inclusions, etc.) along the line of dissimilar steels fusion.

Possibility of transfer abroad:
Licence's sale
Combinated reduction to industrial level

Photo

Country Russia

For additional information turn to:
E-mail: gal@uintei.kiev.ua