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316LN forged round steel for nuclear power pipeline and preparation method of 316LN forged round steel

A pipe and round forging technology, which is applied in the field of 316LN forged round steel for nuclear power pipes and its preparation, can solve the problems of difficult phase transformation of the structure, deformation of grains, improvement of internal structure, etc.

Pending Publication Date: 2022-01-21
浙江大隆特材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, improved materials mainly rely on adding a variety of strengthening alloying elements, and the more alloying elements, the greater the deformation resistance, resulting in poor plasticity of the material and difficulty in phase transformation of the structure, so the internal structure cannot be improved by heat treatment; moreover, nuclear power The forged round steel for pipelines is a large forging, each forging weighs about 1 ton, and has a large size. Therefore, it is difficult to compact and forge through in the process of forging plastic deformation, resulting in uneven internal and external structures, deformation of the core and making it Grain refinement and elimination of internal structural defects

Method used

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  • 316LN forged round steel for nuclear power pipeline and preparation method of 316LN forged round steel
  • 316LN forged round steel for nuclear power pipeline and preparation method of 316LN forged round steel
  • 316LN forged round steel for nuclear power pipeline and preparation method of 316LN forged round steel

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preparation example Construction

[0024] The invention provides a preparation method of 316LN forged round steel for nuclear power pipelines, comprising: sequentially performing segmental heating, forging and solid solution treatment on the 316LN steel ingot to be processed to obtain 316LN forged round steel for nuclear power pipelines; Formula heating includes a preheating section, a heating section, and a soaking section; the forging includes strong pressing and pressing in sequence; the strong pressing is carried out on an anvil; the total deformation of the strong pressing is more than 70%; The amount of deformation per pressing is 5-8%.

[0025] In the invention, the 316LN steel ingot to be processed is heated in sections to obtain the 316LN steel ingot heat-treated before forging.

[0026] The present invention has no special requirements on the composition of the 316LN steel ingot to be processed, and commercially available 316LN steel well known in the art can be used.

[0027] In the present inventio...

Embodiment 1

[0055] A method for preparing 316LN forged round steel for nuclear power pipelines comprises the following steps: sequentially subjecting 316LN steel ingots to be processed to heating in stages, forging, mold forming and solid solution treatment to obtain 316LN forged round steel for nuclear power pipelines.

[0056] First, the 316LN steel ingot to be treated is refined and ground to remove surface defects, and then heated in stages to obtain a 316LN steel ingot that is heat-treated before forging. Sectional heating consists of preheating section, heating section and soaking section, specifically: the 316LN steel ingot to be processed is loaded into a natural gas heating furnace at room temperature, and the temperature is raised to 550°C at a heating rate of 90°C / h in the preheating section heat preservation temperature, and heat preservation at the temperature of the preheating section for 4 hours, and then raise the temperature to the heat preservation temperature of the heat...

Embodiment 2

[0060] The initial anvil width ratio in the high pressure during forging in Example 1 is replaced by 0.53, and the specific parameters of high pressure during forging are shown in Table 2, and the rest of the technical features are the same as in Example 1.

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Abstract

The invention provides 316LN forged round steel for a nuclear power pipeline and a preparation method of the 316LN forged round steel, and belongs to the technical field of metal material machining. The preparation method of the 316LN forged round steel for the nuclear power pipeline comprises the following steps that a 316LN steel ingot to be treated is sequentially subjected to sectional type heating, forging and solution treatment, and the 316LN forged round steel for the nuclear power pipeline is obtained. According to the 316LN forged round steel for the nuclear power pipeline and the preparation method, by adopting a pre-forging segmented heating mode, controlling forging parameters during forging and finally adopting a solid solution strengthening mechanism, the prepared 316LN forged round steel for the nuclear power pipeline has excellent mechanical performance and corrosion resistance, meanwhile, grains are small, non-metallic inclusions are few, and the preparation method is simple, easy to implement and low in cost.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a 316LN forged round steel for nuclear power pipelines and a preparation method thereof. Background technique [0002] AP1000 technology is the third-generation nuclear power technology imported from the United States by my country, and its AP1000 main pipeline is one of the seven key equipment in the nuclear island, known as the "aorta" of the nuclear power plant. The main function is to transport pressurized water containing radioactive substances and maintain the integrity of the pressure boundary to prevent the leakage of radioactive substances. It is required to operate under high temperature and high pressure conditions for 60 years. AP1000 technology is currently the most mature nuclear power technology used at home and abroad. However, with the further improvement of nuclear safety, P1000 technology does not consider the requirements of preventing nuclea...

Claims

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Application Information

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IPC IPC(8): B21J1/06B21J5/00C21D8/06
CPCB21J1/06B21J5/00C21D8/065
Inventor 俞荣新祖宇伟
Owner 浙江大隆特材有限公司
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