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Centrifugal casting method of main pipeline of million-kilowatt nuclear plant

A centrifugal casting, nuclear power plant technology, applied in coating, casting molding equipment, casting molds, etc., can solve the problems of inability to meet the technical requirements of the centrifugal casting of the primary circuit main pipeline, and the inability to meet the centrifugal casting process.

Active Publication Date: 2011-11-16
烟台台海玛努尔核电设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The centrifugal casting process as the prior art cannot meet the above requirements
[0004] In addition, the inner wall of the centrifugal casting mold cylinder needs to be coated with paint, and the existing mold cylinder coating and coating process cannot meet the above-mentioned primary circuit in terms of raw material selection, proportioning and coating process control of the coating. Technical Requirements for Centrifugal Casting of Main Pipe

Method used

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Embodiment Construction

[0019] The following are specific examples of the centrifugal casting method of the present invention.

[0020] 1. Smelting

[0021] It is required that the temperature of the molten steel be controlled at 1640±10°C.

[0022] 2. Cylinder coating and centrifugal pouring:

[0023] (1), type cylinder coating and coating process

[0024] 1. The preparation process of the tube coating:

[0025] Step 1: Prepare zircon powder coating:

[0026] First, according to the ratio of 60kg water to 7 cubic decimeters of bentonite powder, mix water and bentonite powder to make bentonite slurry for zircon powder coating, and let it stand for 24-48 hours, and then mix 1 Raising the ratio of swelling slurry for zircon powder coating and mixing the swelling slurry for zircon powder coating with zircon powder evenly to prepare zircon powder coating for use.

[0027] The second step: prepare quartz powder coating: first, mix water, bentonite powder and water glass according to the ratio of 20kg...

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Abstract

The invention discloses a centrifugal casting method of a main pipeline of a million-kilowatt nuclear plant, which is carried out by centrifugally casting on a horizontal centrifugal casting machine. A mould for forming a centrifugal cast pipe is a forged alloy steel cylinder, inner wall of which is coated through a cylinder. The temperature of used molten steel in a steel ladle is controlled within 1570 plus or minus 10 degrees centigrade. The calm time is not less than 4 min. The rotation speed of the cylinder is controlled within 800-870 r / min. The casting speed is more than or equal to 100 kg / s. After casting, water is cooled below 300 degrees centigrade. Then, the demoulding process is carried out. The thickness of a blank pipe wall of the centrifugal cast pipe is 100 mm. In the event of casting, rapid casting and compulsive water cooling are carried out. Crystal structures can be refined. The operation safety of equipment is improved.

Description

technical field [0001] The invention belongs to the technical field of special casting. Specifically, it is a centrifugal pouring method for the main pipeline of a million-kilowatt nuclear power plant. Background technique [0002] The reactor cooling system (also known as the primary circuit) of the pressurized water reactor nuclear power plant is a nuclear primary equipment system located in the nuclear island, which undertakes the function of transferring the heat generated by the reactor to the steam generator. Since the primary loop coolant directly enters and exits the nuclear reactor, it has radioactive pollution, so the requirements for its reliability are very high. The operating conditions of the primary circuit are harsh, and it must withstand 280-320 ° C, 150-160 atmospheric pressure and corrosive media (the reactor coolant contains boric acid, etc.), so the requirements for materials and manufacturing technology are very high. The main pipe material is stainle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/12B22D13/10B22C3/00
Inventor 王根启李政军赵天明张吉雁
Owner 烟台台海玛努尔核电设备有限公司
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