Improved composite high chromium steel roller and preparation process thereof

Abstract

This invention relates to the improvement of high chrome steel working lining of compound roller and its preparation method, the compound roller is used to casting hot band steel. The characteristic is the ingredient of the high chrome steel working lining, it is as follows: C0.8-2.0%, Si 0.5-1.2%, Mn0.4-1.5%, Ni0.4-1.5%, Cr8-16%, Mo 0.2-3.0%, V0.1-1.0%, N0.01-0.25%, B0.001-0.003%, Al0.01-0.3%, P<=0.03% and S<=0.03%, the other is Fe and some residual impurity, it adopts vertical centrifugal laminar casting. As to the existing high chrome roller, the compound high chrome roller has the superiorities, such as the fall of the working lining is less than 3HSD, the abradability of the roller can improve above 30%, and the yield of millimeter steel can improve around 33%. At the same time, the ability of corrosion resistant improves distinctly, the number of copping roller can decrease 20% at one time, and the working lining combines fine with the metallurgy of core, the lifetime of the roller can increase one time than existing one.

Description

Technical field [0001] The invention relates to an improvement of a composite roll with a high chromium steel working layer for hot-rolled strip steel and a preparation method thereof, and particularly relates to a working layer with good thermal crack resistance, small hardness drop, good wear resistance, and high fatigue strength , Composite high chromium steel roll with strong corrosion resistance and preparation method with excellent metallurgical bonding. Background technique [0002] At present, the composite high-chromium steel roll used in the front end of the hot-rolled strip continuous rolling machine, such as the high-chromium steel in the working layer of the roll as described in Chinese Patent 85102865, has a total composition range of C0.9-2.1% and Si0.2-0.6%. Mn0.3~0.8%, Ni0.5~1.5%, Cr6.0~19.0%, Mo0.5~2.0%, W≤2.0%, Co≤2.0%, and one or two of the following elements: Nb0.1 ~1.0%, V0.1~1.0%, Ti0.1~0.5%, Mg≤0.05%, the rest is iron. However, the existing high chromium s...

AI Technical Summary

Problems solved by technology

However, the existing high-chromium steel working layer still has the following deficiencies in actual use: 1. The hardness drop is large, thereby reducing the overall wear resistance of the roll; 2, the fatigue resistance performance is poor, causing the roll to easily produce cracks; 3. The corrosion ability is poor, the roll surface is easily corroded by certain media, and the roll surface is prone to roughness, resulting in a decrease in the surface quality of the rolled strip; 4. The thermal crack resistance is relatively poor, and the roll body is prone to cracks and / or peeling

Therefore, the overall service life of the existing high-chromium steel working layer composite roll is relatively short, and there is still room for improvement