Chemical high-chromium cast iron roller and preparation method thereof

Abstract

The invention discloses a chemical high-chromium cast iron roller which comprises a high-chromium cast iron work layer and a nodular cast iron roller core. Chemical components of the high-chromium cast iron work layer comprise, by mass percent, 2.1%-2.9% of C, 0.4%-0.8% of Si, 0.5%-08% of Si, 0.5%-0.8% of Mn, 15%-20% of Cr, 0.5%-2% of Ni, 0.5%-2% of Mo, 0.2%-3.0% of V, 0.1%-0.4% of Ti, 0.2%-0.8% of Cu, 0.01%-0.03% of RE, smaller than 0.15% of P, smaller than 0.15% of S and the balance iron. During preparation, a composite centrifugation method is adopted for casting; during heat treatment, thetemperature of a forming roller is increased to range from 920 DEG C to 960 DEG C at the speed ranging from 9 DEG/h to 12 DEG/h, heat preservation is carried out, after quenching, the temperature isincreased to range from 200 DEG C to 250 DEG C for tempering, and heat preservation is carried out for 8 h to 10 h. Laser strengthening treatment is carried out, tempering is carried out at the temperature ranging from 200 DEG C to 250 DEG C, and after heat preservation is carried out for 2 h to 3 h, the chemical high-chromium cast iron roller is obtained. According to the chemical high-chromium cast iron roller, no chip off-falling phenomenon happens in the use process, the roller has good corrosion resistance and high hardness and wear resistance, and the service life of the roller is prolonged.

Description

technical field [0001] The invention belongs to the technical field of roll manufacturing, and in particular relates to a chemical high-chromium cast iron roll and a preparation method thereof. Background technique [0002] Centrifugally cast high-chromium cast iron rolls are widely used in the chemical industry. The performance of rolls and core components directly affects grinding efficiency, maintenance and replacement cycles, etc. The rolls of the prior art often have the following problems during use: [0003] First, during the use of the working layer of the roll, the surface layer may fall off or crack. [0004] Second, when the roll is processing chemical products, it is prone to corrosion under the condition of acid and alkali corrosion. The occurrence of the above phenomena will lead to a decrease in the wear resistance of the roll, affect the service life of the roll, and cause cracking and block loss. [0005] Third, when the roll is used, especially when used...

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Problems solved by technology

[0003] First, during the use of the working layer of the roll, the surface layer appears to be broken or cracked.

[0004] Second, when the roll is processing chemical products, it is prone to corrosion under the condition of acid and alkali corrosion

The occurrence of the above phenomena will reduce the wear resistance of the roll, affect the service life of the roll, and cause cracking and block loss.

[0005] Third, when the roll is used, especially under corrosive conditions, its wear resistance is poor. Due to the existence of corrosion, the wear of the working layer of the roll is accelerated, and the service life of the roll is greatly reduced.

[0006] Fourth, under corrosion conditions, there is an interaction between corrosion and wear. During the use of high-chromium cast iron rolls for chemical industry, increased wear will lead to increased surface defects and accelerated corrosion

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