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Austenitic stainless steel hydrogen embrittlement-resistant weldment for hydrogen energy equipment and preparation method

A technology of austenitic stainless steel and stainless steel is applied in the field of austenitic stainless steel anti-hydrogen embrittlement weldments for hydrogen energy equipment and its preparation, which can solve the problem of high production cost of weldments and difficulty in determining the improvement effect of the anti-hydrogen embrittlement performance of weldments. Issues not considered

Pending Publication Date: 2022-02-25
SOUTH CHINA UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, the method proposed in this document does not consider the influence of the inherent ferrite in the base metal and the newly formed ferrite on the hydrogen embrittlement of the weldment caused by the welding heat cycle, and there are no comparative examples in the document, so it is difficult to determine the method Improve the hydrogen embrittlement resistance of weldments. At the same time, welding filler materials with high nickel content are expensive, resulting in high production costs of weldments

Method used

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  • Austenitic stainless steel hydrogen embrittlement-resistant weldment for hydrogen energy equipment and preparation method
  • Austenitic stainless steel hydrogen embrittlement-resistant weldment for hydrogen energy equipment and preparation method
  • Austenitic stainless steel hydrogen embrittlement-resistant weldment for hydrogen energy equipment and preparation method

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preparation example Construction

[0043] In a second aspect, the present invention provides a method for preparing an austenitic stainless steel anti-hydrogen embrittlement weldment for hydrogen energy equipment, the preparation method comprising the following steps:

[0044] Position and place two stainless steel plates to be welded in the welding environment, and use flat plate butt welding;

[0045] The welding torch equipped with stainless steel electrodes is welded to two stainless steel plates to be welded by melting tungsten argon arc welding. The welding current is 195-205A, the welding voltage is 25-27V, and the welding speed is 33-37cm / min.

[0046] Further, the material of the stainless steel electrode is E308.

Embodiment 1

[0061] Using 304 austenitic stainless steel as the base material, the experimental base metal was plate butt welded by melting electrode tungsten argon arc welding. The welding current was 200A, the welding voltage was 25V, the welding speed was 35cm / min, and the weldment was air-cooled to room temperature. , inspect the appearance of the weld, and conduct welding defect detection to confirm that the welding quality of the weldment is good;

[0062] Cut a 10mm*10mm*1mm weld thin-section sample, after polishing, observe the microstructure of the sample, as shown in Figure 2(c), the ferrite is distributed in a dendritic form;

[0063] The SKPFM atomic force microprobe technology was used to conduct a comparison experiment of the potential distribution of the sample before and after hydrogen charging, as shown in Figure 3(c);

[0064] Cut the standard tensile sample, after polishing and hydrogen charging, the slow strain rate experiment is carried out on the sample, as shown in ...

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Abstract

The invention discloses an austenitic stainless steel hydrogen embrittlement-resistant weldment for hydrogen energy equipment and a preparation method. The content of ferrite in the austenitic stainless steel hydrogen embrittlement-resistant weldment is 7%-9%, and the content of dendritic ferrite accounts for more than 70% of the total content of the ferrite. According to the invention, more channels can be provided for diffusion of hydrogen atoms through the dendritic form characteristic of ferrite, the enrichment degree of the hydrogen atoms at the two-phase interface of austenite and ferrite is reduced, overall hydrogen distribution of a weldment can be homogenized through dominant distribution of the dendritic form, and therefore the hydrogen embrittlement resistance of the weldment is improved.

Description

technical field [0001] The invention relates to the technical field of anti-hydrogen embrittlement equipment, in particular to an austenitic stainless steel anti-hydrogen embrittlement weldment for hydrogen energy equipment and a preparation method thereof. Background technique [0002] As a new type of development energy, hydrogen energy has the advantages of wide sources, no pollution, and recycling, which effectively alleviates the world's resource shortage and environmental pollution problems. It is known as the most ideal ultimate energy in the 21st century. Among them, the high-pressure gas-phase hydrogen storage system has become the focus of promoting the hydrogen energy industry in various countries in the world, and austenitic stainless steel has good application prospects in the field of high-pressure gas-phase hydrogen storage due to its good resistance to hydrogen embrittlement, and is widely used in high-pressure gas-phase storage Preparation of Hydrogen Parts....

Claims

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Application Information

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IPC IPC(8): B23K9/173F17C13/00
CPCB23K9/173F17C13/00C21D2211/005F17C2209/221F17C2221/012Y02E60/32Y02P90/45
Inventor 周池楼戴鹏智何默涵刘先晖
Owner SOUTH CHINA UNIV OF TECH
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