Research on the Process of Improved High Chromium Steel Roll for Hot Rolled Plate and Strip
The technology of hot strip high chromium steel roll was studied.In order to improve the hardness and wear resistance of the use layer,the chemical composition ratio of the use layer is optimized,and the design idea is low carbon,low vanadium and high chromium.The intermediate layer is introduced to effectively control the diffusion of anti-graphitized alloy elements such as Cr,Mo and V to the roll core and improve the strength of the roll neck.In order to enhance the strength of roll neck and improve the nodular-ization effect of roll core,yttrium-based heavy rare earth nodularization agent and composite inoculation method were used to enhance the nodularization effect,prolong the inoculation time,and improve the ability of core hot metal to resist nodularization and inoculation decline.In order to prevent excessive stress caused by high chromium in the outer layer after pouring,the outer layer should be put on the insulation cover to slow cooling immediately after pouring.The bonding quality is improved by improving the cleanliness of the mol-ten steel and upgrading the refractories.The quality problems of the products produced by the trial production were summarized,and the rotation time and interval time of the centrifugal outer layer were adjusted to further improve the combined quality of the products.Through the continuous adjustment of the process,the qualified rate of the product has been significantly improved.
centrifugal compound rollerhigh chromium steelimproved compositiongating system
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NSTL
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