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Method for improving pitting corrosion resistance of G3 alloy plate by using preferred distribution of closely-spaced crystal plane

A technology of alloy plate and crystal surface, applied in the field of metal corrosion protection, can solve the problems of G3 alloy parts that cannot meet the requirements of strength and environmental pollution, and achieve the effect of facilitating rolling deformation, reducing environmental hazards, and ensuring strong and tough matching

Active Publication Date: 2019-04-16
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, surface treatment requires the introduction of additional processes and causes pollution to the environment, and the use of solid solution treatment alone will cause the strength of G3 alloy parts to fail to meet the demand

Method used

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  • Method for improving pitting corrosion resistance of G3 alloy plate by using preferred distribution of closely-spaced crystal plane
  • Method for improving pitting corrosion resistance of G3 alloy plate by using preferred distribution of closely-spaced crystal plane

Examples

Experimental program
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Effect test

Embodiment 1

[0026] like figure 1 As shown, the steps of the method for improving the pitting corrosion resistance of the G3 alloy plate by using the preferred distribution of close-packed crystal planes in this embodiment are as follows:

[0027] (1) The G3 alloy plate is subjected to solution treatment, the solution temperature is 1070°C±5°C, the holding time is 30min, and the water is cooled to room temperature after the holding.

[0028] (2) Carry out pre-deformation treatment to the G3 alloy plate after solution treatment, the pre-deformation method is cold rolling, and the rolling amount is 30%;

[0029] (3) Detexturize the pre-deformed plate at a temperature of 1100°C ± 5°C, hold for 10 minutes, and cool to room temperature with water after the hold.

[0030] (4) Texturing the de-textured G3 alloy plate by cold rolling with a rolling weight of 50%.

[0031] (5) Stress-relief annealing was performed on the textured G3 alloy plate, the annealing temperature was 430°C±5°C, the holdin...

Embodiment 2

[0034] In this embodiment, the steps of the method for improving the pitting corrosion resistance of the G3 alloy plate by utilizing the preferred distribution of close-packed crystal planes are as follows:

[0035] (1) The G3 alloy plate is subjected to solution treatment, the solution temperature is 1100°C±5°C, the holding time is 40min, and the water is cooled to room temperature after the holding.

[0036] (2) Carry out pre-deformation treatment to the G3 alloy plate after solution treatment, the pre-deformation method is cold rolling, and the rolling amount is 35%;

[0037] (3) Detexturize the pre-deformed sheet at a temperature of 1120°C ± 5°C, hold for 15 minutes, and cool to room temperature with water after the hold.

[0038] (4) Texturing the de-textured G3 alloy plate by cold rolling with a rolling weight of 60%.

[0039] (5) Stress-relief annealing was performed on the textured G3 alloy plate, the annealing temperature was 450°C±5°C, the holding time was 90min, an...

Embodiment 3

[0042] In this embodiment, the steps of the method for improving the pitting corrosion resistance of the G3 alloy plate by utilizing the preferred distribution of close-packed crystal planes are as follows:

[0043] (1) The G3 alloy plate is subjected to solution treatment, the solution temperature is 1080°C±5°C, the holding time is 35min, and the water is cooled to room temperature after the holding.

[0044] (2) Carry out pre-deformation treatment to the G3 alloy plate after solution treatment, the pre-deformation method is cold rolling, and the rolling amount is 33%;

[0045] (3) Detexturize the pre-deformed sheet at a temperature of 1110°C±5°C, hold for 12 minutes, and cool to room temperature with water after the hold.

[0046] (4) Texturing the de-textured G3 alloy plate by cold rolling with a rolling weight of 55%.

[0047] (5) Stress-relief annealing was performed on the textured G3 alloy plate, the annealing temperature was 440°C±5°C, the holding time was 80min, and ...

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Abstract

The invention discloses a method for improving the pitting corrosion resistance of a G3 alloy plate by utilizing a preferred distribution of a closely-spaced crystal plane, belongs to the technical field of metal corrosion and protection. The method specifically comprises the steps of solid solution treatment, pre-deformation, texturing eliminating treatment, texturing treatment and stress reliefannealing. According to the method, the adverse effect of the second phase to the corrosion resistance in the material is eliminated through solid solution treatment, and the pre-deformation - texturing eliminating treatment is carried out to eliminate the adverse textures in the raw materials, and texturing - stress relief annealing are carried out to enable {111}, {110}, {001} and the other closely-spaced crystal plane of the G3 alloy are preferentially distributed on the surface of the plate, so that the effect of improving pitting corrosion resistance is achieved. According to the method,the mechanical property of the G3 alloy plate can be ensured, and meanwhile the pitting corrosion resistance of the G3 alloy plate can be improved, the surface treatment on the plate does not need tobe carry out and the method is environment-friendly.

Description

technical field [0001] The invention relates to a method for improving the pitting corrosion resistance performance of a G3 alloy plate by utilizing the preferred distribution of close-packed crystal planes, and belongs to the technical field of metal corrosion protection. Background technique [0002] Nickel-based corrosion-resistant alloy G3 is used in petrochemical fields such as oil exploration and acid-base manufacturing due to its good corrosion resistance and mechanical properties. With the development of deep-sea oil and gas fields, high H 2 S and Cl - Concentration service conditions put forward higher requirements on the pitting corrosion resistance of G3 alloy parts. Pitting corrosion is localized corrosion due to the appearance of a "big cathode and small anode" structure in metals. The local easy-to-corrosion area formed by the composition segregation of metal materials and the precipitation of the second phase is an important cause of pitting corrosion. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 王珏薛浩李桄王章忠
Owner NANJING INST OF TECH
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