Major-diameter continuously cast and rolled grinding ball and preparation method thereof

Abstract

The invention discloses a major-diameter continuously cast and rolled grinding ball and a preparation method thereof. The preparation method comprises the following steps: mixing and smelting following raw materials by weight percent: 0.6-0.9% of C, 0.5-0.75% of Si, 0.5-1.2% of Mn, less than or equal to 0.03% of S, less than or equal to 0.03% of P, 0.1-0.5% of Cr and the balance of Fe; and then adding 0.02-0.03% of B4C and 0.05-0.12% of Re and fully mixing with molten steel; pouring into a metal mould cavity at 1420 DEG C-1470 DEG C; taking out of the mould and forging at 1200 DEG C; oil quenching; and tempering, thereby obtaining an end product. According to the preparation method provided by the invention, nanometer materials B4C and Re are uniformly mixed with metal powder of a cast iron grinding ball material, so that the hardness and impact toughness of the cast iron grinding ball are increased and the service life of the grinding ball is prolonged.

Description

technical field [0001] The invention relates to a large-diameter continuous casting and rolling grinding ball and a preparation method thereof, belonging to the field of mechanical processing. Background technique [0002] At present, adding nanomaterials to the metal melt of alloy cast iron grinding balls can greatly increase the number of crystal nuclei in the melt, and part of them become nuclei cores, making the structure dense and the grains fine; at the same time, some nanoparticles in the metal It becomes particles in the melt, but due to the small grain size of nanomaterials, some of them will float on the surface of the metal melt when directly added, and the effect of uniform dispersion cannot be achieved. Contents of the invention [0003] In order to improve the hardness and impact toughness of the cast iron grinding ball, thereby prolonging the service life of the grinding ball, the object of the present invention is to provide a large-diameter continuous cast...

AI Technical Summary

Problems solved by technology

[0002] At present, adding nanomaterials to the metal melt of alloy cast iron grinding balls can greatly increase the number of crystal nuclei in the melt, and part of them become nuclei cores, making the structure dense and the grains fine; at the same time, some nanoparticles in the metal It becomes a particle in the melt, but due to the fine grain size of the nanomaterial, it will partially float on the surface of the metal melt when directly added, and the effect of uniform dispersion cannot be achieved.