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High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method

A technology for a pressure vessel and a manufacturing method, applied in the field of steel for pressure vessels, can solve the problems of composition segregation, high Si content, excessive non-metallic inclusions, etc. The effect of excellent impact toughness

Inactive Publication Date: 2012-03-28
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large forgings, high Si content is likely to cause serious composition segregation and non-metallic inclusions exceeding the standard

Method used

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  • High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method
  • High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method
  • High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 50kg test steel smelted for vacuum induction melting furnace. Smelt and cast steel slabs according to the chemical composition shown in Table 1, heat the slabs to 1150°C, and carry out forging at a temperature above 950°C. The forging ratio is controlled at >3. After forging, the forgings were annealed at 650°C×8h, normalized and homogenized at 900°C×5h, and then air-cooled at 640°C×8h. Then, in the laboratory, a controllable speed heat treatment furnace was used to simulate the cooling rate of the 200mm thick industrial forging at the water-cooled 1 / 4T wall thickness. After 880°C×5h, it was cooled to 300°C at 36°C / min and then air-cooled at 640°C×8h. Tempering treatment, followed by simulated post-weld stress relief treatment, the heat treatment process is 610 ° C × 24h furnace cooling.

Embodiment 2

[0048] The implementation is the same as in Example 1, wherein the quenching temperature is 890°C, and the tempering temperature is 630°C. The laboratory controllable speed heat treatment furnace is used to simulate the cooling rate at the water-cooled 1 / 4T wall thickness of industrial forgings with a thickness of 180mm, and the simulated cooling rate is selected. 47°C / min.

Embodiment 3

[0050] The implementation is the same as in Example 1, wherein the quenching temperature is 870°C, and the tempering temperature is 645°C. The laboratory controllable speed heat treatment furnace is used to simulate the cooling rate at the water-cooled 1 / 4T wall thickness of industrial forgings with a thickness of 150 mm, and the simulated cooling rate is selected. 60°C / min. The simulated post-weld stress relief heat treatment process is 610℃×48h furnace cooling.

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Abstract

High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method belong to the technical field of steel for pressure vessel. The steel provided by the invention comprises the following chemical components of: by weight, 0.2-0.25% of C; Si being less than 0.1%; 1.3-1.5% of Mn; P being less than or equal to 0.008%; S being less than or equal to 0.008%; 0.6-1% of Ni; 0.1-0.25% of Cr; 0.45-0.6% of Mo; V being less than or equal to 0.01%; Cu being less than or equal to 0.05%; 0.02-0.04% of Al; 0.005-0.015% of N; B being less than or equal to 0.001%; and the balance being Fe and unavoidable impurities, wherein C equivalent range is controlled within 0.6-0.75%. By alloying and appropriate smelting, forging and heat treatment technologies, the forging provided by the invention has high strength and high toughness and less segregation and nonmetal field trash, and can be used for manufacturing large-scale forgings such as a nuclear power station reactor pressure vessel with its wall thickness being greater than 100mm, an evaporator head, a cylindrical shell, a tube plate and the like.

Description

technical field [0001] The invention belongs to the technical field of steel for pressure vessels, and in particular provides a high-strength and high-toughness nuclear power pressure vessel forging steel and a manufacturing method thereof. The forging steel of the invention can be used to manufacture large-scale equipment in nuclear islands such as nuclear power plant reactor pressure vessels and steam generators with a wall thickness greater than 100mm. Background technique [0002] With the further increase of electricity demand and the increasing pressure of energy conservation and emission reduction, nuclear power has become an indispensable clean energy. All countries in the world, especially China, are actively planning their own future nuclear power plant construction goals. In the design of the new-generation pressurized water reactor nuclear power plant, in order to improve the efficiency and safety of the reactor, the reactor is gradually developing in the direct...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/00
Inventor 刘正东林肇杰何西扣杨钢干勇张文辉王宝忠
Owner CENT IRON & STEEL RES INST
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