High-molybdenum high-vanadium microsegregation cast high speed steel for rolls

Abstract

The invention relates to a high molybdenum and high vanadium micro-segregation casting high speed steel for milling roller, belonging to steel rolling and manufacturing field. The composition (wt%) is as follows: C 1.2 to 2.8%, Si 0.2 to 1.0%, Mn 0.2 to 1.0%, Ni 0.3 to 1.2, Cr 3.0 to 6.0%, Mo 5.0 to 10.0%, V 5.0 to 12.0%, Al 0.1 to 0.7%, P less than or equal to 0.025%, S less than or equal to 0.025%, and remaining part of Fe. The high molybdenum and high vanadium micro-segregation casting high speed steel is characterized in increasing content of Mo and V in high speed steel to substitute element W in the prior art, reducing gravity segregation caused by heavy element W during centrifugal casting, enabling even radial performance of milling roller, and improving application stability. The high molybdenum and high vanadium micro-segregation casting high speed steel for milling roller has the advantages of less casting segregation, high hardness, strong abradability, good red hardness and excellent toughness.

Description

technical field [0001] The invention belongs to the field of rolling steel manufacturing, and specifically relates to a high-molybdenum and high-vanadium micro-segregation cast high-speed steel for rolls, which is suitable for manufacturing working layers of centrifugal composite high-speed steel rolls. Background technique [0002] High-speed steel rolls are more and more popular in the field of steel production because of their high red hardness, high wear resistance and hardenability. Relevant enterprises and scientific research units in various countries and regions continue to explore and research high-speed steel rolls. It has become a general trend for high-speed steel rolls to replace high-chromium cast iron rolls in the front section of finishing rolling in strip mills. [0003] Cast high-speed steel rolls were first successfully developed by the Japanese in 1988 and used on hot strip rolling mills. The United States began to introduce high-speed steel rolls in the ...

AI Technical Summary

Problems solved by technology

[0006] Using high-speed steel with high W content and using the centrifugal casting method to produce rolls will inevitably cause gravity segregation due to the large proportion of W, resulting in a large W content in the outer layer of the roll and a small W content in the inner layer. The composition gradient is caused in the radial direction of the roll, which seriously affects the uniformity of the radial performance of the roll

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