Preparation method of heat-resistant CrMoV steel casting part and heat-resistant CrMoV steel casting material

Abstract

The invention discloses a preparation method of a heat-resistant CrMoV steel casting part. The steel casting part comprises the following main chemical components in percentage by weight: 0.12-0.20% of C, 0.20-0.60% of Si, 0.5-0.9% of Mn, not greater than 0.020% of P, not greater than 0.012% of S, 1.0-1.5% of Cr, 0.9-1.2% of Mo, 0.1-0.5% of Ni, 0.20-0.35% of V, and the balance iron and residual elements; the steel casting part prepared through the abovementioned components is treated by normalizing and tempering. The method for producing the casting part is applicable to the production of thecasting part used in high-temperature environment, such as a gas turbine casting part; the produced casting part is high in high-temperature lasting mechanical performance and meets the requirements on the mechanical performance under normal temperature and high temperature.

Description

technical field [0001] The patent of the invention relates to a method for preparing heat-resistant CrMoV steel castings, in particular to a heat treatment process for preparing steel castings with high-temperature-resistant mechanical properties, and the heat-resistant CrMoV steel castings produced by the preparation method. Background technique [0002] The gas turbine has the advantages of light weight, small size, high single-unit power, stable operation, long life, and convenient maintenance. It is a high-tech product that is related to the national economy and the people's livelihood such as national defense, energy, transportation, and environmental protection, and has great development prospects. As the main model of power generation equipment, gas turbine is the core of power equipment in the 21st century, and the corresponding steel castings for heavy-duty gas turbines have broad market prospects. [0003] High-efficiency air-cooled gas turbines are made of CrMoV ...

AI Technical Summary

Problems solved by technology

[0004] The difficulty in the production of this kind of steel castings lies in how to ensure that the castings meet the mechanical performance requirements of both room temperature and high temperature conditions. The strength and hardness of castings produced by existing production technologies exceed the upper limit of the standard, and the short-term high-temperature durability meets the requirements, but there is plastic toughness. It does not meet the standard requirements. If the strength and hardness are reduced to improve the plasticity and toughness, the short-term high-temperature durability performance will not meet the standard requirements.

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