Method for manufacturing double metal composite wear-resistant metallurgical rollers

Abstract

A method for manufacturing double metal composite wear-resistant metallurgical rollers includes steps of roller core processing, preheating, surfacing of a composite layer, finish machining and thermal treatment. The roller core processing step includes subjecting steel good in tensile strength, yield strength and impact resistance to forging, pressing and tempering, manufacturing roller core blanks, subjecting the roller core blanks to rough machining to reserve size for a surfaced composite layer. The preheating step includes preheating the roller cores to the optimum surfacing temperature of 380 DEG C +/- 5 DEG C. The surfacing step of the composite layer includes surfacing and filling the reserved surfaced composite layer by flux-cored wires on the surface of the preheated roller cores by means of submerged-arc welding process. The finish machining step includes processing the surfaced double metal composite wear-resistant metallurgical roller blanks into design size. The thermal treatment step includes quenching and tempering the double metal composite wear-resistant metallurgical rollers subjected to finish machining, so that the surfaces of the double metal composite wear-resistant metallurgical rollers can meet the requirements for good anti-sticking abrasion, grain abrading resistance, red hardness, resistance to cold and hot fatigue, and peeling resistance.

Description

technical field [0001] The invention relates to a manufacturing method of a roll, especially a manufacturing method of a bimetal composite wear-resistant metallurgical roll. The roll manufactured by the method not only has low cost, but also has a long service life, which can reduce steel rolling accidents and reduce rolling costs. It belongs to the technical field of surface hardening. Background technique [0002] At present, traditional metallurgical rolls are generally made of cast steel or forged steel made of 60CrNiMo, 65CrNiMo, and 60CrMnMo through quenching and tempering, quenching and other heat treatment processes. The material contains a large amount of precious metals; The weight of each roll is between 15 and 120 tons, and the price of each roll is between 360,000 and 7.2 million yuan. The price is very high, and the manufacturing period is long. Due to the wear of the rolls caused in the rolling process, the rolls need to be repaired by shrinking after a peri...

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Problems solved by technology

[0002] At present, traditional metallurgical rolls are generally made of cast steel or forged steel made of 60CrNiMo, 65CrNiMo, and 60CrMnMo through quenching and tempering, quenching and other heat treatment processes. The material contains a large amount of precious metals; The weight of each roll is between 15 and 120 tons, and the price of each roll is between 360,000 and 7.2 million yuan. The price is very high, and the manufacturing period is long

Due to the wear of the rolls caused in the rolling process, the rolls need to be repaired by shrinking after a period of use. After repeated several times, the rolls will be scrapped. From the original diameter to scrapping, the effective usage of a roll is about 100% of the total weight of the roll. 20-25%, the weight treated as scrap steel is 75-80% of the total weight of the roll; in addition, the current internal and external materials of the roll are consistent, due to the excessive emphasis on the material's anti-adhesive wear, anti-abrasive wear, red hardness, and resistance to cold and heat fatigue The toughness and yield strength of the roll material are low, coupled with operational errors and other reasons, the phenomenon of broken rolls occurs from time to time, and the failure of broken rolls accounts for about 5-8% of the total amount of rolls; data show that in 2010 China consumes about 4.5 million tons of various rolls, of which steel rolls account for 80% of the total consumption, steel roll consumption is about 3.6 million tons, broken rolls are directly scrapped 200,000 to 300,000 tons, and normal scrapping is about 250 to 270 tons 10,000 tons, the total annual consumption is about 2.7-3 million tons; the quantity is very alarming; the metallurgical rolls made of 60CrNiMo, 65CrNiMo, and 60CrMnMo currently have a low amount of passing steel

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