A refractory steel material used for blades of centrifugal pumps and a preparation method of the material

Abstract

The invention discloses a refractory steel material used for blades of centrifugal pumps. The refractory steel material comprises following chemical elements by weight: 0.2-0.4% of carbon, 0.7-0.9% of silicon, 1.2-1.5% of manganese, 0.6-0.9% of nickel, 0.5-0.7% of molybdenum, 1.4-1.6% of vanadium, 0.04-0.07% of Ho, S not more than 0.05% and P not more than 0.05%, with the balance being iron. By utilization of the silicon, the vanadium, the rare earth element holmium, and other elements, and by adding the raw materials in batches and reasonably controlling the thermal treatment temperature after casting, an alloy formed has characteristics of high strength and high hot strength, and capability of being impact resistant, corrosion resistant and wear resistant. A portion of waste iron is used as a raw material of the steel material and a secondary refining process is performed so that the quality of the steel material is stable and uniform. The steel material is suitable for centrifugal pump blades operated at high temperature so that the blades have high lift and are not liable to damage. A refining agent provided by the invention is used for casting production. The porosity degree in castings is reduced by 1-2 degrees. Oxide inclusion is at about the 2 level.

Description

technical field [0001] The invention relates to the field of metal material preparation, in particular to a heat-strength steel material for centrifugal pump blades and a preparation method thereof. Background technique [0002] The working environment of pump valves is diverse and harsh, and the requirements for materials are very high. At present, there are many kinds of alloy steel used in pump valves, and the technology has made great progress, but there are still many problems, such as wear resistance, hardness, rust resistance Performance, corrosion resistance, high and low temperature resistance, brittleness, toughness, etc., cannot meet the production requirements in many occasions, and further improvement is needed to improve production efficiency, reduce costs, and improve safety. Guaranteeing and providing impetus for social development are still arduous tasks. Contents of the invention [0003] The object of the present invention is to provide a heat-strength ...

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Problems solved by technology

[0002]Pumps and valves work in various and harsh environments, and have high requirements for materials. At present, there are many kinds of alloy steels used for pumps and valves, and the technology has made great progress, but There are still many problems, such as wear resistance, hardness, antirust performance, corrosion resistance, high and low temperature resistance, brittleness, toughness, etc., which cannot meet the production requirements in many occasions, and further improvement is needed to increase production efficiency. , reduce costs, improve safety, provide guarantee for the development of high-precision technology, and provide impetus for social development, the task is still very arduous