Infinite chilled centrifugal composite casting roller for bright steel finished product rack and process

Abstract

The invention discloses an infinite chilled centrifugal composite casting roller and process for a bright steel finished product rack, the roller comprises a roller outer layer and a roller core part, the roller outer layer comprises the following chemical components in percentage by mass: 3.00-3.50% of C, 0.60-1.20% of Si, 0.60-1.20% of Mn, 1.20-1.80% of Cr, 3.50-4.50% of Ni, 0.40-0.80% of Mo, 1.00-2.00% of niobium and vanadium, less than or equal to 0.03% of P, less than or equal to 0.025% of S, more than or equal to 0.02% of Re and the balance of Fe and inevitable impurities; the roller core part comprises the following chemical components in percentage by mass: 3.00 to 3.40 percent of C, 200 to 2.50 percent of Si, 0.40 to 0.60 percent of Mn, 0.10 to 0.20 percent of Cr, more than or equal to 0.04 percent of Mg and the balance of Fe and inevitable impurities; the process comprises the following steps: selecting furnace charge; alloy is added in the smelting process; a pouring process; a roller special heat treatment process; and roller performance detection. The carbide is added to form the vanadium element and the high-rigidity element niobium with strong refined grain compactness, the physical and chemical properties of the roller are improved, a working layer is high in hardness, good in wear resistance and excellent in rigidity, and oxidative hot cracks are not prone to being generated during rolling operation.

Description

technical field [0001] The invention belongs to the field of rolls, and in particular relates to an infinite chilled centrifugal composite casting roll for a finished frame of bright steel and a process thereof. Background technique [0002] Bright (silver) bright steel refers to bright steel products with a silver surface after hot rolling of special steel grades and pickling, including bars and profiles. The steel grades produced by such steel products are as follows: [0003] First, tool and die steel, high-speed steel, such as 9CrWMn; [0004] Second, bearing steel, such as GCr15; [0005] Third, spring steel, such as 50Gr; [0006] Fourth, austenitic stainless steel and valve steel, such as 1Cr18Ni9, Cr14Ni9Mo2; [0007] Fifth, martensitic stainless steel and valve steel, such as 2Cr13, 4Cr9Si2; [0008] Sixth, carbon structure and valve steel, such as 45, 40Cr. [0009] Due to the relatively high stiffness of these steel grades, the rolling load of the roll during...

AI Technical Summary

Problems solved by technology

[0011] As the market continues to put forward new requirements for the surface quality of bright (silver) steel production, if the rolls of the above-mentioned traditional materials meet the new requirements, either the rolling output is low, which affects production efficiency, or the surface of the pass is prone to heat generation. Cracks, affecting the surface quality of the rolled piece, or bursting grooves, causing the roll to fail early

[0012] The existence of these factors seriously affects the production cost, production efficiency and benefit of the enterprise

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