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

Abstract

A high-hardness alloy steel material for pump valves comprises the following chemical element components by mass percent: 0.9-1.4% of carbon, 0.8-1.1% of silicon, 2.1-2.4% of manganese, 0.6-0.8% of chromium, 0.03-0.05% of vanadium, 0.12-0.14% of molybdenum, 0.01-0.02% of lanthanum, 2.1-2.3% of magnesium, 0.04-0.06% of W, 0.12-0.16% of Tm, not more than 0.04% of S, not more than 0.04% of P, and the balance of iron. The low alloy steel provided by the invention not only has high hardness, but also has good toughness, good wear resistance, high thermal strength, low dynamic load gap sensitivity, and high fatigue strength, and also is good in casting performance, and high in casting yield. The method of the invention partly adopts scrap iron as a raw material; secondary refining is performed; heat treatment temperature after casting is controlled reasonably; raw materials are fed in batches; and thus the alloy is provided with more stable and uniform quality, and improved comprehensive mechanical properties.

Description

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

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