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Manufacturing method for sealing head of high strength austenite nickel iron chrome alloy

A technology of nickel-iron-chromium alloy and production method, which is applied in the field of production of high-strength austenitic nickel-iron-chromium alloy head, can solve problems such as easy cracks, improve plasticity, eliminate defects, and improve intergranular resistance The effect of corrosion performance

Inactive Publication Date: 2012-10-10
NANJING DUBLE METAL EQUIP ENG
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Problems solved by technology

[0003] The purpose of the present invention is: to solve the problem that the high-strength austenitic nickel-iron-chromium alloy N08810 series heads are prone to cracks during the production process, the present invention provides a production plan for the N08810 series heads

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  • Manufacturing method for sealing head of high strength austenite nickel iron chrome alloy

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Embodiment Construction

[0009] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. figure 1 L1 is heated by an empty furnace, L2 is heated with the furnace, L3 is kept warm in the furnace, and L4 is rapidly water-cooled. After the N08810 head has passed the re-inspection of the raw materials, it is cut according to the size required by the process. The head plates that need to be spliced ​​are spliced ​​according to the process requirements. Various parameters and testing requirements must meet the process requirements. The surface is 100% PT tested. According to JB / T4730-2005 Class I qualification inspection, after passing the non-destructive testing, the spliced ​​welds shall be ground, and the weld reinforcement after grinding shall be 0.5~1mm to ensure that the welds are flush with the base metal after the head is pressed. After grinding, 100% PT inspection is performed on the weld again. According to JB / T4730-2005 level I qua...

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Abstract

Disclosed is a manufacturing method for a sealing head of a high strength austenite nickel iron chrome alloy. A solid solution process is utilized before pressing the sealing head, a hot molding process is utilized after solid solution, and another solid solution process is utilized after hot molding; the conditions of the solid solution processes before and after pressing include when an empty furnace is heated to 1000 DEG C, a sealing head alloy plate is placed into the furnace, the temperature during placing the sealing head alloy plate into the furnace is guaranteed to be larger than or equal to 800 DEG C, the temperature of the sealing head alloy plate with furnace is raised to a solid solution temperature of 115 DEG C+ / -20 DEG C, the sealing head alloy plate is taken out of the furnace rapidly after being kept for a certain period of time (3-8h) and cooled instantly, hot pressing is utilized for the sealing head pressing, the sealing head alloy plate is taken out of the furnace after being heated to 1150 DEG C+ / -20 DEG C, and is subjected to hot pressing while the plate is hot, the hot pressing times are more than or equal to 2 times, the temperature of the sealing head is measured at any time during the pressing process, when the temperature is below 890 DEG C, the sealing head is placed into the furnace to be heated again, and balanced temperature rising is required.

Description

technical field [0001] The invention relates to the manufacture of high-strength austenitic nickel-iron-chromium alloy (N08810 series) heads, especially the manufacturing process of the heads. Background technique [0002] N08810 is a solid solution high strength austenitic nickel-iron-chromium alloy. Resistant to high-temperature oxidation, high-temperature peeling and high-temperature carbonization, the nickel content of the alloy is 30.%~35.0%, which is sufficient to resist chloride stress corrosion. Compared with stainless steel and other non-ferrous materials, N08810 material has better corrosion resistance to strong corrosive media such as strong acid and strong alkali, and has a higher service temperature. N08810 materials are mainly used in nuclear reactors; heat treatment furnace components; catalytic regenerators and other processing and production equipment for the petrochemical industry. In recent years, this material has been widely used in production equipmen...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/40
Inventor 邓家爱郝雪霞吴厚金成一冰郭俊霞
Owner NANJING DUBLE METAL EQUIP ENG
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