Wear-resistant high holding precision rolling rear working roller and production method thereof

Abstract

The invention discloses a wear-resistant high holding precision rolling rear working roller which is applied to working roller at precision rolling rear section of hot belt continuous mill in rolling industry. The working layer material thereof comprises a roller body of alloy cast iron and a roller core made of ductile cast iron; the working layer comprises the following alloy components according to percentages by weight: 3.00-3.50% of C, 0.40-1.20% of Si, 0.50-1.20% of Mn, not more than 0.10% of P, not more than 0.05% of S, 1.30-2.50% of Cr, 3.20-4.50% of Ni, 0.20-1.00% of Mo, 0.50-1.00% of W, 1.5-2.0% of V, and Fe and unavoidable impurities as the rest. The casting method thereof comprises the following steps: using a horizontal centrifuging machine to cast working layer of roller; statically casting core portion and roller neck portion after condensation of the working layer; then annealing the roller for 28-30h at 420-430 DEG C and annealing the roller for 28-30h at 490-510 DEG C. The working roller prepared in the invention has high wearing resistance and excellent roller holding ability, and is capable of completely meeting quality requirement of rolling high-grade plate.

Description

technical field [0001] The invention relates to a roll made of a new material, in particular to a work roll with high wear resistance and high holding capacity, which is suitable for the work roll in the post-finishing section of a hot strip continuous rolling mill in the steel rolling industry. Background technique [0002] The work rolls in the post-finishing section of the hot-rolled strip are set on the exit frame of the strip and plate, which is the final process of rolling the strip and plate. degree has an important influence. In recent years, high-speed steel rolls have begun to be promoted in the post-finishing section, but high-nickel-chromium infinite chilled cast iron rolls still occupy a dominant position on the finished frame. Infinite chilled cast iron mainly refers to nickel-chromium-molybdenum infinite chilled cast iron material, commonly known as high nickel-chromium material. Chinese patent document ZL94111491.0 discloses the above-mentioned cast iron co...

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Problems solved by technology

[0003] All these changes will inevitably lead to higher and higher requirements for the work rolls in the finishing rolling stage. Some problems have occurred in the production of the original high-nickel-chromium products, which are mainly manifested in two aspects: First, due to the high nickel-chromium rolls The hardness drop in the working layer is large, and the hardness of the roll will drop greatly after the surface layer is worn for a period of time, resulting in the roll being not wear-resistant. The wear resistance is poor during use, and the working layer will be worn during use. Thin, severe on-line wear, poor roll shape retention ability, sharply increased wear in the middle and late stages of use, and difficulty in ensuring the dimensional accuracy and shape of the plate; second, the roughness of the roll surface deteriorates rapidly in the middle and late stages of use. In the later period of use, the roll surface will peel off and fall off, which will affect the quality of the rolled steel plate surface

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