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Production process of nuclear bolt

A production process and bolt technology, which is applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems that the requirements for strength, hardness and impact resistance are very strict, and the production process cannot meet the requirements, so as to achieve strong anti-corrosion ability, Good lubricity and fine phosphating film

Active Publication Date: 2012-12-12
浙江高强度紧固件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the fasteners used in nuclear power equipment are very demanding in terms of strength, hardness and impact resistance. For fasteners that need to meet nuclear power level 1, 2, and 3 equipment, the existing production process cannot meet the requirements

Method used

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  • Production process of nuclear bolt
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  • Production process of nuclear bolt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The production process of nuclear power bolts, the technological process is blank preparation-heat treatment-flaw detection inspection-surface treatment.

[0034] Using 42CrMoE steel as raw material, the chemical composition mass percentage is: C content 0.405%, Si content 0.23%, Mn content 0.78%, P content 0.012%, S content 0.013%, Cr content 0.94%, Mo content 0.17%, the balance is Fe. Raw material production inspection, blanking, plane chamfering, heat treatment, thread blank diameter grinding, thread rolling.

[0035] The heat treatment process quenches and tempers bolts < 0.5M and bolts ≥ 0.5M respectively. Bolts with a length of less than 0.5M are quenched in a mesh belt furnace with alloy steel quenching oil as the medium, the quenching temperature is 850°C, and the holding time is 2 hours. After quenching, continue tempering in the mesh belt furnace, the tempering temperature is 680°C, and the holding time is 2.5 hours.

[0036] Bolts with a length ≥ 0.5M are ...

Embodiment 2

[0039] The raw materials and process flow of this embodiment are the same as those in Embodiment 1, except that in the heat treatment process, for bolts with a length <0.5M, the quenching temperature is 860° C., and the holding time is 2 hours. After quenching, continue tempering in the mesh belt furnace, the tempering temperature is 630°C, and the holding time is 2.5 hours.

[0040] Bolts with a length ≥ 0.5M are quenched in a pit furnace with mechanical oil as the medium, the quenching temperature is 860°C, and the holding time is 2.5 hours. After quenching, continue to temper in the pit furnace, the tempering temperature is 630°C, and the time is 3 hours.

Embodiment 3

[0042] The process flow of this embodiment is the same as that of Embodiment 1, the difference is the raw materials and heat treatment process.

[0043] Using 42CrMoE steel as raw material, the chemical composition mass percentage is: C content 0.38%, Si content 0.10%, Mn content 0.75%, P content 0.025%, S content 0.015%, Cr content 0.80%, Mo content 0.15%, the balance is Fe.

[0044] For bolts with a length less than 0.5M, the quenching temperature is 860°C and the holding time is 2 hours. After quenching, continue tempering in the mesh belt furnace, the tempering temperature is 620°C, and the holding time is 2.5 hours.

[0045] Bolts with a length ≥ 0.5M are quenched in a pit furnace with mechanical oil as the medium, the quenching temperature is 860°C, and the holding time is 2.5 hours. After quenching, continue to temper in the pit furnace, the tempering temperature is 620°C, and the time is 3 hours.

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Abstract

The invention mainly discloses a production process of a nuclear bolt. A 42CrMoE steel material is adopted as a raw material, and the nuclear bolt is produced by blank preparation, heat treatment, surface treatment and flaw detection, wherein the raw material of 42CrMoE comprises the following chemical components by mass percent: 0.38 to 0.48 of C, 0.10 to 0.40 of Si, 0.75 to 1.00 of Mn, no more than 0.025 of P, no more than 0.015 of S, 0.80 to 1.15 of Cr, 0.15 to 0.30 of Mo and the balance of Fe. The product obtained by production in the invention meets the requirements of nuclear 1-stage equipment, nuclear 2-stage equipment and nuclear 3-stage equipment, and the strength, the hardness and the impact resistance all reach standards.

Description

technical field [0001] The invention relates to a production process of fasteners, in particular to a nuclear power bolt production process meeting the requirements of nuclear power level 1, 2 and 3 equipment. Background technique [0002] A nuclear power plant is a power facility that uses the thermal energy generated by one or several power reactors to generate electricity or generate electricity and heat. The fuel used in nuclear power plants is uranium. The nuclear fuel made of uranium is fissioned in the "reactor" equipment to generate a large amount of heat energy, and then the water under high pressure is used to take out the heat energy and generate steam in the steam generator. Push the steam turbine to rotate together with the generator, and electricity is continuously generated and sent to all directions through the grid. [0003] In order to ensure the safety of nuclear power plants, the strictest defense measures conceivable should be taken in terms of design a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B35/00
Inventor 葛少辉葛海泉戴建海肖建敏
Owner 浙江高强度紧固件有限公司
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