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Heat treatment process for refining 10Cr9MoW2VNbBn crystal grains

A grain refinement and process technology, applied in the field of heat treatment process for grain refinement of 10Cr9MoW2VNbBN, can solve problems such as unsatisfactory effect, achieve uniform distribution, increase temperature, and solve the effect of grain size problem

Active Publication Date: 2019-06-07
WUXI HONGDA HEAVY IND
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Problems solved by technology

[0008] The conventional heat treatment process for grain refinement of 10Cr9MoW2VNbBN steel is normalizing + high temperature tempering, high temperature normalizing + high temperature tempering, and then conventional normalizing + high temperature tempering, complete annealing, the effect is not ideal

Method used

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Embodiment Construction

[0020] 10Cr9MoW2VNbBN grain refinement heat treatment process: the 10Cr9MoW2VNbBN steel forgings are subjected to heat treatment of high temperature isothermal annealing and conventional isothermal annealing, and then quenched and tempered after village processing. After thermal insulation, the temperature rises rapidly through high-power heating, thereby increasing the heating speed of steel forgings and increasing the nucleation rate of austenite.

[0021] High-temperature isothermal annealing includes first austenitization and first isothermal annealing; conventional isothermal annealing includes second austenitization and second isothermal annealing, and the heating temperature of the first austenitization is higher than that of the second austenitization temperature;

[0022] The specific process of the first austenitization is as follows: preheat at 650°C for 2 to 3 hours, then raise the ambient temperature to 1070°C-1100°C with high power, keep it warm for 6 to 8 hours,...

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Abstract

The invention provides a heat treatment process for refining 10Cr9MoW2VNbBn crystal grains. The equilibrium tissue of pearlite and ferrite is obtained, tissue heredity is destroyed, the alloy elementcan be more uniformly distributed, and the heat treatment process can play a good role in solving the problem of crystal mixing. According to the heat treatment process, a 10Cr9MoW2VNbBn steel forgedpiece is sequentially subjected to heat treatment of high-temperature isothermal annealing and conventional isothermal annealing, and then steel forged piece is subjected to line quenching and tempering after being subjected to village processing, wherein the rising temperature of the austenitizing in the high-temperature isothermal annealing and the conventional isothermal annealing after heat preservation is rapidly increasing through high-power heating, so that the heating speed of the steel forging piece is increased, and the nucleation rate of austenite is increased.

Description

technical field [0001] The invention relates to the technical field of material heat treatment, in particular to a heat treatment process for refining 10Cr9MoW2VNbBN grains. Background technique [0002] The forging manufacturing industry is the basic industry of the national equipment manufacturing industry. It is also an indispensable strategic industry related to national security and the lifeline of the national economy. It is also an important component of national capabilities. The development level of large forgings is a measure of a country's comprehensive capabilities important sign. [0003] With the rapid development of my country's shipbuilding, electric power, petroleum, chemical and other industries, the development of my country's free forging industry has been accelerated to a large extent. However, the product size is getting larger and the technical requirements are getting higher and higher. It not only promotes It has not only promoted the continuous upgr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/26C21D1/18
Inventor 张瑞庆张忠明张伟东孙景会马晗珺
Owner WUXI HONGDA HEAVY IND
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