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Method for eliminating medium-temperature island-shaped structures during normalization of 15NiCuMoNb5 steel

A normalizing and microstructure technology, applied in the field of elimination of mesophilic island structure, can solve the problems of reducing toughness, impact performance difficult to meet the requirements of use, etc.

Inactive Publication Date: 2014-11-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the appearance of granular structure in steel greatly reduces the toughness of the steel, making it difficult to meet the requirements of impact performance

Method used

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  • Method for eliminating medium-temperature island-shaped structures during normalization of 15NiCuMoNb5 steel
  • Method for eliminating medium-temperature island-shaped structures during normalization of 15NiCuMoNb5 steel
  • Method for eliminating medium-temperature island-shaped structures during normalization of 15NiCuMoNb5 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 15NiCuMoNb5 steel pipes or plates, and cut cylindrical samples with wire cutting. The sample size is 5mm×5mm×20mm. Processing in the experimental device: set the program as follows: the heating rate is 20K / min, from room temperature to the austenite zone of 1173K, keep warm for 5 minutes, then start rolling and deformation by 10%, and then cool at 5K / min after deformation rate down to room temperature.

[0023] The volume fraction of island structure in the 15NiCuMoNb5 steel structure controlled by the austenite zone is reduced from 10.2% to 8.1%, the volume fraction of ferrite is 90.2%, and the impact energy at room temperature is increased from 27J to 39J.

Embodiment 2

[0025] Take 15NiCuMoNb5 steel pipe or plate, and cut cylindrical sample with wire cutting. The sample size is 3mm×3mm×40mm; Processing in the experimental device: set the program as follows: the heating rate is 100K / min, from room temperature to the austenite zone of 1253K, keep warm for 10 minutes, and then start rolling deformation, the deformation amount is 60%, respectively, after deformation Cool down to room temperature at a cooling rate of 20K / min.

[0026] The island structure volume fraction in the 15NiCuMoNb5 steel microstructure controlled by the austenite zone is reduced from 10.2% to 7.5%, the ferrite volume fraction is 91.2%, and the impact energy at room temperature is increased from 27J to 43J.

Embodiment 3

[0028] Take 15NiCuMoNb5 steel pipes or plates, and cut cylindrical samples with wire cutting. The sample size is 5mm×5mm×30mm; Processing in the experimental device: the setting program is: the heating rate is 40K / min, from room temperature to the austenite zone of 1223K, heat preservation for 7 minutes, and then rolling deformation, the deformation amount is 40%, respectively, and then Cool down to room temperature at a cooling rate of 15K / min.

[0029] The island structure volume fraction in the 15NiCuMoNb5 steel microstructure controlled by the austenite zone is reduced from 10.2% to 2.2%, the ferrite volume fraction is 95.1%, and the impact energy at room temperature is increased from 27J to 48J.

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Abstract

The invention relates to a method for eliminating medium-temperature island-shaped structures during normalization of 15NiCuMoNb5 steel. The method comprises the following steps of: processing the 15NiCuMoNb5 steel into a tubular product or a sheet material through hot rolling; performing rolling deformation on a 15NiCuMoNb5 steel sample in a high-temperature austenitic area: setting conditions as follows: raising the temperature of the austenitic area from a room temperature to 1173-1253K at a temperature rise rate of 20-100K / min, and preserving the heat for 5-10 minutes; then carrying out rolling deformation with the deformation amount of 10-60% respectively; and cooling the deformed sample to the room temperature at a cooling rate of 5-20K / min. Compared with a sample which is not subjected to the deformation in the austenitic area, the 15NiCuMoNb5 steel sample which is treated by the method has the advantages that the volume fraction of granular ferrite is greatly increased, and the medium-temperature island-shaped structures basically disappear. The ballistic work of a sample with the deformation amount of 40% is the highest and reaches 55J. By adopting the method, the impact property of the 15NiCuMoNb5 steel can meet operating requirements.

Description

technical field [0001] The invention belongs to the technical field of Ni-Cu-Mo type low-alloy structural steel production, and particularly relates to a method for eliminating the medium-temperature island structure harmful to the impact performance of 15NiCuMoNb5 steel. Background technique [0002] The continuous rapid growth of China's economy has put forward higher requirements for the power generation industry. Thermal power generation will remain the main force of my country's power supply for a long period of time in the future. Therefore, the domestic demand for high-pressure boiler tubes will continue to grow. . [0003] Throughout the development of my country's power plant boiler materials, it is following a route of introduction, digestion and absorption. There are steel grades from the former Soviet Union, and steel grades from the United States, Japan and Germany since the 1980s. While studying the localization of imported steel grades, it is also carrying out ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00
Inventor 刘永长张旦天马宗青余黎明高志明
Owner TIANJIN UNIV
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