Alloy steel material for low temperature resistant pump valve and preparation method thereof

Abstract

The invention relates to a low-temperature-resistant alloy steel material for pump valves, which contains the following chemical components in percentage by mass: 0.2-0.4% of carbon, 1.3-1.5% of silicon, 3.2-3.4% of manganese, 0.3-0.4% of vanadium, 0.12-0.24% of niobium, 1.0-1.1% of titanium, 0.04-0.07% of Mg, at most 0.04% of S, at most 0.04% of P and the balance of iron. The titanium, manganese, niobium and other elements are added on the basis of medium / low-carbon steel, so the cold brittleness of the alloy is greatly lowered, and the alloy can resist low temperature. The material has the characteristics of excellent wear resistance, higher hardness and favorable plasticity. Part of scrap iron is used as the raw material, and secondary refining is performed, so that the product quality is more stable and uniform. When the refining agent is used for casting production, the porosity in the casting is lowered by 1-2 degrees, and the oxide inclusions are in the second grade or so. The alloy steel is used for pump valves, impellers and delivery pipelines operating in a low-temperature environment, can not be easily damaged, and has long service life.

Description

technical field [0001] The invention relates to the field of metal material preparation, in particular to an alloy steel material for low temperature resistant pump valves 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 low tem...

AI Technical Summary

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