Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll

Abstract

A composite roll having uniform roll surface hardness and made of high-speed steel containing boron and a method for manufacturing the composite roll belong to the technical field of manufacture of rolls. A roll body is made of the high-speed steel containing boron, a roll core is made of spheroidal graphite cast iron, the roll body and the roll core are centrifugally cast in a compounded manner,and metallurgical bonding is realized. On the basis of high-tungsten high-speed steel, the chromium content of the roll body is reduced, and the boron and a proper quantity of trace alloying elementssuch as potassium, sodium, calcium, barium, zinc, magnesium, lanthanum, cerium and the like aer added into the roll body. The roll body is heated in a heating furnace, stays warm and then is placed in a cooling control device, a roll neck is coated with a heat-insulating material and is placed outside the cooling control device, the roll body is in spray cooling according to a spray quenching process 1, then is in spray cooling according to a spray quenching process 2 until the temperature of the roll body is lower than 160 DEG C, and is in natural air cooling, when the temperature of the roll surface rises to 300 DEG C, the roll body is in spray cooling according to the spray quenching process 2 again, spray cooling is performed repeatedly until the rising temperature of the roll surfacedoes not exceed 300 DEG C, and then the roll body is in air cooling to the room temperature. The roll surface hardness of the composite roll is high, hardness uniformity of the roll surface is good, wear resistance of the roll is fine, and the service life of the composite roll is long.

Description

technical field [0001] The invention relates to a manufacturing method of a high-speed steel composite roll, in particular to a boron-containing high-speed steel composite roll with uniform roll surface hardness and a manufacturing method thereof, belonging to the technical field of roll manufacturing. Background technique [0002] Modern metallurgical industrial production is a systematic project integrating mining, mineral processing, sintering, ironmaking, steelmaking and steel rolling. Steel rolling is the last link of this systematic project. Most metallurgical products can only enter the market after rolling. The roll is the most important production tool in the rolling process. The quality of the roll directly affects the output and quality of metallurgical products. The level of a country's roll manufacturing technology directly reflects the level of the country's metallurgical industry. Modern metallurgical rolls have experienced several important processes in the d...

AI Technical Summary

Problems solved by technology

However, after quenching and cooling, the roll of this invention also needs to be tempered, which has a long cycle and low efficiency.

Images