Steel material for hydraulic valve and preparing method of steel material

Abstract

The invention provides a steel material for a hydraulic valve. The steel material comprises the following chemical element ingredients in percentage by mass: 2.2 to 2.4 percent of C(Carbon), 0.8 to 0.95 percent of Si(Silicon), 2.1 to 2.3 percent of Mn(Manganese), 1.3 to 1.5 percent of Mo(Molybdenum), 0.8 to 1.1 percent of Ni(Nickel), 7.5 to 7.8 percent of Cr(Chromium), 0.7 to 0.9 percent of Ti(Titanium), 0.04 to 0.07 percent of Pr, at most 0.05 percent of S, at most 0.05 percent of P and the balance Fe(ferrum). The elements such as the Cr, the Pr and the Ti are used for modifying high-carbon steel; a formed alloy has the characteristics of high hardness, high intensity, good wear-resistant performance, anti-corrosion performance, small linear expansion coefficient and small deformation quantity; partial scrap iron is used as raw materials; and through twice refining, the quality is more stable and more uniform. The alloy steel is used for the hydraulic valve; the service life is long; and the cost is low. Refining agents are used for casting production; the finished product rate is obviously improved; particularly, the porosity degree in a casting is reduced by 1 to 2 degrees; and the oxide inclusion is about in Grade 2.

Description

technical field [0001] The invention relates to the field of metal material preparation, in particular to a steel material for hydraulic 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 steel material for hydraulic valves...

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