Red-hardness high alloy steel material for pump valves and preparation method thereof

Abstract

A red-hardness high alloy steel material for pump valves comprises the following chemical element components by mass percent: 0.2-0.4% of carbon, 0.6-0.9% of silicon, 1.7-1.9% of manganese, 2.1-2.4% of molybdenum,1.6-1.8% of chromium, 0.02-0.04% of vanadium, 0.02-0.05% of nickel, 0.1-0.15% of niobium, 0.04-0.06% of Ta, not more than 0.04% of S, not more than 0.04% of P, and the balance of iron. The alloy steel of the invention not only has high hardness and good red hardness, but also has good toughness and good wear resistance. The method of the invention partly adopts scrap iron as a raw material; secondary refining is performed; and the comprehensive mechanical properties are improved. The alloy steel of the invention is suitable for high-wear rate parts used at high temperature, such as pump shafts, pipelines, valves and the like. The method of the invention adopts a refining agent in the casting production, which significantly improves the yield, especially reduces the degree of porosity in casting by 1-2 degrees, and controls the oxide inclusion level at about grade two.

Description

technical field [0001] The invention relates to the field of metal material preparation, in particular to a red hardness high alloy steel material for 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 red hardness hig...

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