High-toughness alloy steel material used for shaft sleeves of centrifugal pumps and preparation method of the material

Abstract

The invention discloses a high-toughness alloy steel material used for shaft sleeves of centrifugal pumps. The alloy steel material comprises following chemical elements by weight: 0.2-0.4% of carbon, 0.3-0.45% of silicon, 1.7-2.1% of manganese, 0.7-0.9% of chromium, 2.3-2.5% of molybdenum, 0.5-0.7% of vanadium, 0.12-0.16% of aluminum, 0.05-0.08% of copper, 0.04-0.07% of Tb, S not more than 0.05% and P not more than 0.05%, with the balance being iron. An alloy formed has characteristics of high toughness, strength and wear resistance, and is impact resistant and corrosion resistant by adding the chromium, the aluminium, the rare earth element terbium, and other elements, and by adding raw materials in batches and reasonably controlling the thermal treatment temperature after casting. The alloy steel material is suitable for the shaft sleeves of the centrifugal pumps and can effectively protect bearings. A refining agent provided by the invention is used for casting production, and therefore the yield of finished product is increased, and in particular, the porosity degree in castings is reduced by 1-2 degrees and 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 an alloy steel material for a high-strength toughness centrifugal pump shaft sleeve 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...

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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