Hypoeutectic high-chromium cast iron for slurry pump blade and heat treatment process

Abstract

The invention discloses hypoeutectic high-chromium cast iron for a slurry pump blade and a heat treatment process. The cast iron comprises chemical components by weight percentage: 2.6-2.8 percent of C, 26-32 percent of Cr, 0.5-0.7 percent of Si, 0.3-0.6 percent of Mn, 0.2-0.4 percent of Ni, 0.1-0.2 percent of Mo, 0.02-0.04 percent of Cu, less than or equal to 0.05 percent of P, less than or equal to 0.05 percent of S and Fe in balancing amount. The heat treatment process comprises the following steps: smelting the cast iron in an electric furnace; performing composite modification treatment on the molten iron by using a Re-V-Ti-Bi-Mg compound modifier; performing pilling treatment; performing stress relief annealing; machining; and quenching and tempering; a carbide can be changed in form into dispersed masses, so as to reduce the fragmentation effect on a substrate material; and an impeller product of a slurry pump, with high performances and a long service life, can be obtained.

Description

technical field

[0001] The invention relates to a special hypoeutectic high-chromium cast iron in the field of slurry pump blade manufacturing and a heat treatment process. Background technique

[0002] Slurry pumps are widely used in industries such as electric power, coal mines and metallurgy to transport solid-liquid mixtures containing hard particles. Most of the slurry pump products are centrifugal slurry pumps, and their working principle is the same as that of centrifugal clean water pumps. The working medium of the slurry pump is a solid-liquid mixture composed of solid materials with a certain particle size, hardness and concentration and water, such as mud, ore pulp and mortar. Working under the ground not only bears the erosion and wear of materials, but also bears the corrosive effect of slurry, and the working conditions are extremely harsh. Severe wear is the biggest long-standing problem of slurry pumps, and it is also the main direction of scientific resear...