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Heat treatment method of Hastelloy casting

A heat treatment method and technology of Hastelloy, applied in the field of heat treatment processing, can solve the problems of inability to improve the quality of castings, hot cracks, heat treatment deformation, etc., and achieve good economic benefits, cost reduction, and reduction of thermal deformation and hot cracks.

Inactive Publication Date: 2012-02-08
绍兴万龙精密机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the heat treatment of existing Hastelloy castings, heat treatment deformation often occurs, and even thermal cracks occur, so that the quality of treated castings cannot be improved

Method used

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  • Heat treatment method of Hastelloy casting
  • Heat treatment method of Hastelloy casting
  • Heat treatment method of Hastelloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical composition of Hastelloy alloy is:

[0024] C mn P S Si Cr Mo V Fe N 0.02 0.8 0.020 0.018 0.5 20.5 12.5 0.15 4.0 3

[0025] The solid melting temperature of Hastelloy castings is set at 1050°C, and the holding time is 1.5 hours. The castings are placed under control before heating in the high-temperature furnace to prevent the heat treatment deformation of equipment components from affecting the deformation of the castings, such as figure 1 As shown, the reinforcement ring 1 is used to alternate the castings 2 and place them layer by layer. Then put the Hastelloy casting into a high-temperature furnace for heating, and before loading the furnace, coat the surface of the casting with an oxidation coating to prevent excessive oxidation and thermal cracks on the surface of the casting. The composition of the oxidation coating is refractory mud: zircon powder: water with a mass ratio ...

Embodiment 2

[0028] The difference from the first embodiment is that the chemical composition of the Hastelloy alloy is different and the control parameters are different.

[0029] The chemical composition of Hastelloy alloy is:

[0030] C mn P S Si Cr Mo V Fe N 0.02 0.85 0.020 0.020 0.6 21 12.7 0.15 4.5 3

[0031] The solid melting temperature of Hastelloy castings is set at 1100°C, and the holding time is 1.5 hours. Put the Hastelloy castings into a high-temperature furnace for heating, and quickly immerse the castings in 30°C water to cool after coming out of the furnace.

Embodiment 3

[0033] The difference from the first embodiment is that the chemical composition of the Hastelloy alloy is different and the control parameters are different.

[0034] The chemical composition of Hastelloy alloy is:

[0035] C mn P S Si Cr Mo V Fe N 0.02 0.8 0.02 0.02 0.8 21.5 13 0.25 4.8. 3

[0036] The solid melting temperature of Hastelloy castings is set at 1150°C, and the holding time is 1.5 hours. Put the Hastelloy castings into a high-temperature furnace for heating, and quickly immerse the castings in 20°C water to cool after coming out of the furnace.

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Abstract

The invention mainly discloses a heat treatment method of a Hastelloy casting. The method comprises the steps of: 1, setting a furnace temperature: according to the chemical components of the Hastelloy casting, heating a heat treatment casting to reach a temperature between a solid phase line and a liquid phase line of the Hastelloy casting, and carrying out heat preservation; 2, heating and preserving the temperature: placing the Hastelloy casting into a high-temperature furnace for heating, discharging automatically and obliquely by adopting a trolley, adding a body temperature-measuring thermocouple in the high-temperature furnace for detecting the temperature of a casting body, comparing with an air thermocouple, and ensuring that a temperature curve is consistent with a program set curve; and 3, water-cooling: when the casting reaches the preset heat preservation time, discharging at a temperature of 1150-1175 DEG C, and rapidly placing the casting in water of below 10 DEG C for cooling, thereby obtaining high-strength corrosion resistance. According to the invention, heat deformation and heat cracks in a heat treatment process are reduced, and the Hastelloy casting with highstrength and high flexibility is obtained.

Description

technical field [0001] The invention relates to the technical field of heat treatment processing, in particular to a heat treatment method for Hastelloy castings. Background technique [0002] Hastelloy belongs to nickel-molybdenum-chromium-iron-tungsten nickel-based alloy. It is one of the most corrosion-resistant modern metal materials. It is mainly resistant to wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has good corrosion resistance in low temperature and medium temperature hydrochloric acid. Therefore, in the past three decades, it has been widely used in harsh corrosive environments, such as chemical industry, petrochemical industry, flue gas desulfurization, pulp and paper, environmental protection and other industrial fields. [0003] As-cast Hastelloy castings need to undergo solution heat treatment, and rapid cooling can obtain the best corrosion resistance. During any heating operation, precautions ...

Claims

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Application Information

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IPC IPC(8): C22F1/10
Inventor 程序
Owner 绍兴万龙精密机械制造有限公司
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