A method for controlling the microstructure and properties of the working layer of a centrifugal roll

Abstract

The invention discloses a method for controlling the microstructure and performance of the working layer of a centrifugal roll, which belongs to the technical field of steel rolling, and includes post-cast isothermal quenching cooling control and blank isothermal annealing+tempering heat treatment in the solidification process of the roll; it is suitable for the mass fraction of the component content C: 2.6~3.6%, Ni≥4.0%, Σ(Cr+Mo+V+W)≥2% infinitely chilled cast iron centrifugal roll solidification + heat treatment method. In the present invention, by rationally controlling the solidification and cooling process, the annealing temperature and time of the centrifugal roll made of infinitely chilled cast iron, the microstructure after heating can reach the performance equivalent to that of the annealed microstructure twice or more, and it replaces and solves the problem that such rolls have to go through more than two times of annealing. Annealing treatment, the problems of long equipment occupation time, long production cycle and high cost have the characteristics of simple production process and stable performance.

Description

technical field [0001] The invention relates to the technical field of steel rolling manufacturing, in particular to a method for controlling the microstructure and properties of a working layer of a centrifugal roll, which is used in a method for coordinating solidification and heat treatment of a centrifugal roll made of infinitely chilled cast iron. Background technique [0002] The working rolls in the rear section of the hot-rolled strip mill generally choose a working layer made of infinitely chilled cast iron and a ductile iron core, and are produced by a centrifugal composite process. They are often used in hot continuous rolling finishing stands and rough and finishing rolling of medium-width and thick plates. The work roll, the working layer generally adopts the composition of hypoeutectic cast iron. By adding a higher alloy ratio, the as-cast structure is made of a certain amount of eutectic graphite and carbide, and the matrix is ​​mainly paraben. After casting, i...

AI Technical Summary

Problems solved by technology

[0002] The working rolls in the rear section of the hot-rolled strip mill generally choose a working layer made of infinitely chilled cast iron and a ductile iron core, and are produced by a centrifugal composite process. They are often used in hot continuous rolling finishing stands and rough and finishing rolling of medium-width and thick plates. The work roll, the working layer generally adopts the composition of hypoeutectic cast iron. By adding a higher alloy ratio, the as-cast structure is made of a certain amount of eutectic graphite and carbide, and the matrix is ​​mainly paraben. After casting, in order to achieve Tissue performance requirements, generally two or even multiple annealing treatments, there are problems of long equipment occupation time, long production cycle, and high cost