Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump

Abstract

The invention belongs to the field of manufacture of a wear-resistant material of a slurry pump, and discloses a casting and thermal treatment technology for high-chromium iron on a flow passage component of the slurry pump. The high-chromium iron comprises the following components in percentage by weight: 2.7-3.4% of C, 26-28% of Cr, 0.3-0.5% of Si, 0.02-0.04% of RE, 0.6-1.0% of Mo, 0.6-0.8% of Cu, 0.4-0.7% of Mn, 0.6-0.8% of Ni, 1.2-1.6% of W, 0.03-0.05% of B, 0.05-0.15% of Ti and 0.05-0.15% of V. The casting and thermal treatment technology comprises the manufacturing steps of: (1) modeling; (2) material proportioning; (3) electric induction furnace melting; (4) casting; (5) thermal treatment; (6) cleaning and machining. The casting defects can be eliminated by adopting random risers and cast steel coating and enlarging a gate cup for fast gating; quenching and annealing technologies are adopted, the temperature rise speed is controlled to be between 30DEG C / h and 40DEG C / h, the gradient temperature holding is carried out for 1-2h in a temperature interval from 200DEG C to 700DEG C, the quenching temperature is 980-1020DEG C, and the temperature holding time is two to four hours; the high-chromium iron has excellent textures, the Rockwell hardness can reach 63HRC, the impact toughness (20DEG C impact absorbed energy) can reach 4.6J, the service life can be prolonged by 20%, and the properties such as wear resistance and corrosion resistance can be greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of manufacture and processing of a wear-resistant material for a slurry pump, and in particular relates to a wear-resistant material used for a slurry pump and a heat treatment process. Background technique [0002] The slurry pump is the main equipment used to transport the slurry. The commonly used sheaths, impellers and guard plates on the slurry pump are washed by the high-speed, high-temperature, strong alkaline slurry carrying hard particles when they are working. Under the joint action of erosion wear, strong acid or strong alkali corrosion and cavitation, the material loss on the surface of the flow parts is serious, and the flow parts such as the sheath, impeller and guard plate are under the harsh working conditions of corrosive slurry erosion wear. Under the circumstances, it is a wearing part that is consumed in large quantities, and its life is very short. This situation has greatly affected pro...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a casting and heat treatment process of high chromium cast iron used in the flow parts of the slurry pump, so as to solve the problem of frequent replacement in the prior art, which causes equipment and even production lines to stop, which will reduce production efficiency and wear resistance. gender issues