Heat treatment method of large heat-resistant high alloy steel castings

A heat treatment method and alloy cast steel technology, which is applied in the field of heat treatment of steel castings, can solve the problems of high content, difficult smelting, and many alloy elements, and achieve the effects of high alloy content, large residual stress, and avoiding cracking

Inactive Publication Date: 2018-05-25
RUGAO OUTONG MACHINERY FITTINGS
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Problems solved by technology

[0003] Due to the many alloy elements and high content of this type of material, the difficulty of smelting, the high requirements of welding technology and heat treatment, and other technical barriers, it is still very difficult for my country's manufacturing enterprises to produce such castings.

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Embodiment Construction

[0008] The present invention will be described in detail below with specific embodiments.

[0009] The heat treatment method of the large-scale heat-resistant high-alloy steel casting of the present invention comprises the following steps:

[0010] 1) High-temperature diffusion annealing: Cool the large steel casting after pouring to 200-150°C in the sand mold naturally, then shake out the sand, remove the sand block, mold bone and cold iron on the surface of the casting, and then pour it together The risk system moves the cast steel as a whole into the heat treatment furnace for high-temperature diffusion annealing. At a heating rate of 20-50°C / h, the temperature is raised to 1050°C-1110°C for T time, where the holding time T=D*2min / mm, The value of D is the maximum value of the maximum wall thickness of the casting or the thickness of the riser, and then the casting is cooled to 500-550°C with the furnace at a cooling rate of 20-40°C / h, and kept for 4h-8h to reduce the casti...

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Abstract

The invention relates to a heat treatment method of large heat-resistant high alloy steel castings in the technical field of steel casting heat treatment. The heat treatment method of the large heat-resistant high alloy steel castings includes the process of high-temperature diffusion annealing, gating and risering system cutting, normalizing air cooling, primary tempering and secondary tempering,and it is set that carbon arc air gouging dressing is performed on the surfaces of the castings between the primary tempering and the secondary tempering. The method solves the problem that the largeheat-resistant high alloy steel castings with a ZG12Cr9Mo1CoNiVNbNB material are prone to cracking in the heat treatment process, and makes various normal temperature and high temperature mechanicalproperties of the steel castings meet the using requirement.

Description

technical field [0001] The invention relates to the technical field of heat treatment of steel castings, in particular to a heat treatment method for large heat-resistant high-alloy steel castings. Background technique [0002] The high heat-resistant high-alloy steel casting material is ZG12Cr9Mo1CoNiVNbNB, which is a new type of heat-resistant material. This material will be the mainstream steel grade for high-temperature resistant parts of clean and efficient ultra-supercritical steam turbines in the future. Castings of this type of material can be used at 600-620 Under the extreme conditions of ℃ and 30MPa for long-term service, due to the high temperature and high pressure characteristics of the material itself, its service conditions are 30℃ and 3MPa higher than the most advanced heat-resistant materials at present, which can not only improve power generation energy enterprises by 8-10 % efficiency, and can greatly reduce carbon dioxide emissions, it is the main high-e...

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Application Information

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IPC IPC(8): C21D6/00C21D1/26C21D1/28C21D1/18
CPCC21D6/00C21D1/18C21D1/26C21D1/28
Inventor 石卫明
Owner RUGAO OUTONG MACHINERY FITTINGS
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