【摘 要】
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Results of work on melting,pouring,forging and heat treatment of 415 ton ingots from steel of 45 H3 MIF as semiproducts for manufacturing of large backup rolls according to order of company《 Severstal
【机 构】
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PJSC《 Energomashspetsstal》,Kramatorsk 84306,Ukraine
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Results of work on melting,pouring,forging and heat treatment of 415 ton ingots from steel of 45 H3 MIF as semiproducts for manufacturing of large backup rolls according to order of company《 Severstal》 are described.For the production of rollers new grade of steel on a base 0.45% C and 3% Cr,alloyed additionally by Mo and V is developed on PJSC《 Energomashspetsstal》 and applied in industry.Steel of bainite class,provides the best combination of strength and plasticity properties.Preparation of metal was produced by melting of the 7 heats in arc steel-melting furnaces with the capacity 100 and 50 tons with subsequent out-of-furnace treatment on ladle- furnace and ladle-degassing units.The pouring of steel was carried out from four steel-pouring ladles in vertical mould under a vacuum through a tundish ladle with protection of stream by argon.Forging of ingots was conducted on the automated forging complex by force of 150 MN.Obtained billets exposed to primary heat treatment,which consisting in heating for recrystallization,isothermal soaking,to providing the removal of residual stresses,additional dehydrogenization,giving to material the lower hardness and controlled cooling for prevention of snowflake formation.Heating of ingots for forging and preliminary heat treatment was carried out in heat treatment furnaces with carrying capacity t0 500 ton.For heat treatment of backup roll horizontal sprayer unit was applied.Tooling of backup roll was executed on a lathe with one pace-plate and final mechanical treatment conducted on the machine-tool of Hercules NWD 1 500 × 18 000 CNC.Finished products with mass of 225 ton of the followings sizes:a diameter and length of barrel 2 360 mm and 4 800 mm accordingly at general length 10 650 mm were obtained.
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