High-pressure fluid storage vessel with oxidation and hydrogen embrittlement resistance through surface treatment

Abstract

To provide a high-pressure fluid storage container which is surface-treated to have oxidation resistance / hydrogen embrittlement resistance, thereby enhancing sealability and enabling long-term use.SOLUTION: A high-pressure fluid storage container comprises: a container body, which has a storage space for storing high-pressure fluid inside, and a plug coupling portion formed at least on one of the two end portions thereof; and an end plug which is coupled to the plug coupling portion, and has a fluid passage hole formed internally to allow the flow of fluid therethrough. A surface-treated embrittlement-resistant layer is formed in an area where at least the plug coupling portion and the end plug come into contact with each other, in order to prevent oxidation and hydrogen embrittlement.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a high-pressure fluid storage vessel, and more particularly to a high-pressure fluid storage vessel having oxidation resistance / hydrogen embrittlement resistance due to a surface treatment. [Background technology]

[0002] Fossil fuels, which have traditionally been used as the main energy source, are expected to run out over time, and due to environmental pollution issues, human interest is gradually shifting to alternative energy sources.

[0003] Among these alternative energy sources, hydrogen fuel is attracting attention. Hydrogen is not only extremely abundant, but also has no environmental pollution concerns and has great potential.

[0004] In particular, hydrogen-fueled automobiles have been researched as an alternative to existing automobiles using internal combustion engines, and the results are now beginning to appear.

[0005] Therefore, various researches are being actively conducted on storage containers that can be installed in automobiles and charging stations and can safely store hydrogen gas filled at high pressure.

[0006] A commonly used method for manufacturing hydrogen storage containers is to prepare a pipe having a hollow interior, and then pressurize the pipe while rotating it in a spinning process to form the overall shape.

[0007] However, because such hydrogen storage containers are continuously exposed to a high-pressure hydrogen gas environment, there is a problem in that hydrogen penetrates into the steel material from which they are made, causing hydrogen embrittlement, which reduces their physical properties.

[0008] This not only significantly reduces the airtightness of the hydrogen storage container, but also acts as a cause of shortening its lifespan.

[0009] Therefore, a solution to this problem is needed. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-2015-0137895 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made to solve the problems of the prior art described above, and aims to provide a high-pressure fluid storage container that is surface-treated to have oxidation resistance / hydrogen embrittlement resistance, thereby improving airtightness and enabling long-term use.

[0012] The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0013] In order to achieve the above object, the present invention provides a high-pressure fluid storage container with oxidation resistance / hydrogen embrittlement resistance through a surface treatment. The container includes a container body having a storage hole formed therein for storing a high-pressure fluid and a plug coupling portion formed at at least one of both ends, and end plugs coupled to the plug coupling portion and having fluid passage holes formed therein through which the fluid flows, and at least the area where the plug coupling portion and the end plug contact each other is formed with an embrittlement-resistant treatment layer that is surface-treated to prevent oxidation and hydrogen embrittlement.

[0014] In this case, the embrittlement-resistant treatment layer may be formed on both the plug coupling portion and the end plug.

[0015] The container body and the end plug may be made of a steel material containing chromium (Cr).

[0016] The embrittlement-resistant treatment layer may be formed by the steps of: (a) loading the plug coupling portion and the end plug into a chamber; (b) injecting air into the chamber and primarily heating the plug coupling portion and the end plug in an atmospheric environment; (c) evacuating the air from the chamber; and (d) injecting hydrogen into the chamber and secondary heating the plug coupling portion and the end plug in a hydrogen atmosphere.

[0017] In this case, in the step (b), the plug coupling portion and the end plug may be heated to a temperature of 600° C. to 900° C. in an atmospheric environment.

[0018] Furthermore, in the step (d), the water vapor partial pressure is set to 10 -8 ~10 -1 The pressure may be controlled to MPa and the temperature may be increased to 1000°C to 1200°C.

[0019] Meanwhile, the present invention may further include an airtightness forming unit provided in a ring-shaped seal groove formed between the end surface of the container body and the opposing surface of the end plug that contacts the end surface of the container body, sealing the inside of the storage space.

[0020] The airtight seal forming unit may include a seal jacket made of an elastic material that can be fitted into the seal groove and has an insertion space formed therein with one side open, and a pressure spring made of a metal material that is inserted into the insertion space and provides elastic pressure on both sides centered on the opening of the insertion space, thereby tightly adhering the seal jacket to the end surface of the container body and the opposing surface of the end plug. [Effects of the Invention]

[0021] The oxidation-resistant / hydrogen embrittlement-resistant high-pressure fluid storage container of the present invention, which solves the above-mentioned problems, has an embrittlement-resistant surface layer formed at least in the area where the plug joint of the container body and the end plug come into contact with each other. This has the advantage of preventing oxidation of the material and the penetration of hydrogen molecules into the material, thereby improving airtightness.

[0022] Furthermore, the high-pressure fluid storage container according to the present invention has the advantage that it can be used for a long period of time because it can prevent oxidation of the material and embrittlement by hydrogen.

[0023] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a diagram showing a high-pressure fluid storage container having oxidation resistance / hydrogen embrittlement resistance due to surface treatment according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view of one end of a high-pressure fluid storage container having oxidation resistance / hydrogen embrittlement resistance due to a surface treatment according to a first embodiment of the present invention. [Figure 3] 1A to 1C are diagrams showing the overall process of forming an embrittlement-resistant layer of a high-pressure fluid storage container having oxidation resistance / hydrogen embrittlement resistance by surface treatment according to a first embodiment of the present invention. [Figure 4] 1 is a view showing an airtight seal forming unit provided between a container body and an end plug in a high-pressure fluid storage container according to a first embodiment of the present invention. FIG. [Figure 5] 1 is a diagram showing the structure of an airtight seal forming unit applied to a high-pressure fluid storage container according to a first embodiment of the present invention. [Figure 6] FIG. 6 is a view showing the state of a seal jacket in a high-pressure fluid storage container according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a view showing the state of a seal jacket in a high-pressure fluid storage container according to a third embodiment of the present invention. [Figure 8] 10 is a view showing the state of the inside of a seal groove and a seal jacket in a high-pressure fluid storage container according to a fourth embodiment of the present invention. FIG. [Figure 9] FIG. 10 is a view showing the state of the inside of a seal groove in a high-pressure fluid storage container according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] In this specification, when a component (or region, layer, portion, etc.) is referred to as being "on," "coupled," or "bonded" to another component, this means that it may be directly disposed / coupled / or bonded to the other component, or that a third component may be disposed therebetween.

[0026] The same reference numerals refer to the same elements, and in the drawings, thickness, proportions, and dimensions of elements are exaggerated for the purpose of effectively explaining the technical contents.

[0027] "And / or" includes all combinations of one or more of which the associated constructs can be defined.

[0028] Terms such as "first," "second," and "third" may be used to describe various components, but the components should not be limited by these terms. These terms are used only to distinguish one component from another. For example, a first component can be designated a "second component," and similarly, a second component can be designated a "first component," without departing from the scope of the present invention. A singular expression includes a plural expression unless the context clearly dictates otherwise.

[0029] Furthermore, terms such as "under," "below," "up," "on," and "above" are used to describe the relative relationships of the components shown in the drawings. These terms are relative concepts and are described based on the directions shown in the drawings.

[0030] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Furthermore, terms as defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and are not interpreted as idealized or overly formal in meaning unless expressly defined herein.

[0031] Terms such as "comprise" or "have" specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof stated in the specification, but do not preclude the possible presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0033] FIG. 1 is a diagram showing a high-pressure fluid storage container 10 having oxidation resistance / hydrogen embrittlement resistance due to a surface treatment according to a first embodiment of the present invention.

[0034] As shown in FIG. 1, a high-pressure fluid storage container 10 according to a first embodiment of the present invention includes a container body 20 and an end plug 30.

[0035] The container body 20 has a storage space formed therein for storing a high-pressure fluid, and may have various lengths and shapes depending on the location and use to which it is applied.

[0036] In addition, in this embodiment, the high-pressure fluid filled in the storage space is hydrogen, but the high-pressure fluid that can be applied to the high-pressure fluid storage container 10 according to the present invention is not limited to hydrogen.

[0037] The end plug 30 may be coupled to at least one of the ends of the container body 20 .

[0038] That is, the end plug 30 may be provided at only one end of the container body 20 or at both ends of the container body 20 depending on the configuration of the container body 20 .

[0039] For this purpose, a plug coupling portion 20 a for coupling with the end plug 30 may be formed at one of both ends of the container body 20 .

[0040] In addition, a fluid passage hole 31 through which the fluid flows may be formed inside the end plug 30, and the fluid passage hole 31 forms a gas flow path when the high-pressure fluid storage container 10 is docked to external filling equipment or gas extraction equipment.

[0041] Meanwhile, in this embodiment, the container body 20 and the end plug 30 may be formed of a steel material containing chromium (Cr), but the material of the container body 20 and the end plug 30 is not limited to this.

[0042] FIG. 2 is a cross-sectional view of one end of a high-pressure fluid storage container 10 having oxidation resistance / hydrogen embrittlement resistance due to a surface treatment according to a first embodiment of the present invention.

[0043] As shown in FIG. 2, the high-pressure fluid storage container 10 of this embodiment may have an embrittlement-resistant surface-treated layer C formed at least in the region where the plug coupling portion 20a and the end plug 30 contact each other to prevent oxidation and hydrogen embrittlement.

[0044] Such an embrittlement-resistant layer C serves to prevent oxidation of the materials constituting the vessel body 20 and the end plugs 30 and the permeation of hydrogen molecules into the materials.

[0045] As a result, the embrittlement-resistant treated layer C can improve the airtightness of the high-pressure fluid storage container 10 of this embodiment, enabling it to be used for a long period of time.

[0046] Furthermore, the embrittlement-resistant treatment layer C may be formed on only one of the plug coupling portion 20a of the container body 20 or the end plug 30, or may be formed on both the plug coupling portion 20a of the container body 20 and the end plug 30.

[0047] In this embodiment, the embrittlement-resistant treatment layer C is formed on both the plug coupling portion 20a and the end plug 30 as an example.

[0048] On the other hand, the method for forming such an embrittlement-resistant layer C is as follows.

[0049] FIG. 3 is a diagram showing the overall process for forming an embrittlement-resistant layer C of a high-pressure fluid storage container 10 having oxidation resistance / hydrogen embrittlement resistance by surface treatment according to the first embodiment of the present invention.

[0050] As shown in FIG. 3, the process of forming the embrittlement-resistant treatment layer C may include steps (a) to (d).

[0051] Step (a) is a process of inserting the plug coupling portion 20a of the container body 20 and the end plug 30 into the chamber.

[0052] At this time, if the entire container body 20 is to be surface treated, the entire container body 20 may be loaded into the chamber, but if only the plug connection portion 20a of the container body 20 is to be surface treated, only the plug connection portion 20a may be exposed to the chamber, and a pre-treatment may be performed to prevent the treatment gas supplied in the process described below from diffusing to other parts of the container body 20.

[0053] Step (b) is a process of injecting air into the chamber and primarily heating the plug coupling portion 20a and the end plug 30 in an atmospheric environment.

[0054] In this embodiment, step (b) may be performed by heating the plug coupling portion 20a and the end plug 30 to a temperature of 600° C. to 900° C. in an atmospheric environment to form an oxide film.

[0055] The reason for this is that if heating is performed at a temperature below 600° C., the oxide film formed on the surfaces of the plug coupling portion 20a and the end plug 30 will not have a sufficient thickness.

[0056] Furthermore, if heating is performed at a temperature exceeding 900° C., an excessive oxide film will be formed in this step, which will make it difficult to form an embrittlement-resistant film in step (d) described below.

[0057] Next, step (c) is a process of evacuating the air in the chamber.

[0058] This is for step (d) described below, and is a process for completely exhausting the air contained inside the chamber to the outside.

[0059] Step (d) is a process of injecting hydrogen into the chamber and secondarily heating the plug joint portion 20a and the end plug 30 in a hydrogen atmosphere.

[0060] In this embodiment, step (d) is carried out by increasing the water vapor partial pressure to 10 -8 ~10 -1 MPa, and the plug joint portion 20a and the end plug 30 are heated to a temperature of 1000° C. to 1200° C. to form an embrittlement-resistant film.

[0061] The reason for this is that if heating is performed at a temperature below 1000° C., the embrittlement-resistant film formed on the surfaces of the plug coupling portion 20a and the end plug 30 will not have a sufficient thickness.

[0062] Furthermore, if heating is performed at a temperature exceeding 1200° C., the embrittlement-resistant film will become thicker in this step, which may reduce the adhesiveness of the entire embrittlement-resistant layer C.

[0063] As described above, the high-pressure fluid storage container 10 according to the present invention has a surface-treated embrittlement-resistant layer C formed at least in the area where the plug coupling portion 20a of the container body 20 and the end plug 30 come into contact with each other, which has the advantage of preventing oxidation of the material and the penetration of hydrogen molecules into the material, improving airtightness, and enabling long-term use.

[0064] On the other hand, the high-pressure fluid storage container 10 of this embodiment may further include an airtightness forming unit provided in a ring-shaped seal groove formed between the end face of the container body 20 and the opposing surface of the end plug 30 that contacts the end face of the container body 20, sealing the inside of the storage space.

[0065] FIG. 4 is a diagram showing the state of the airtight seal forming unit 100 provided between the container body 20 and the end plug 30 in the high-pressure fluid storage container according to the first embodiment of the present invention.

[0066] As shown in FIG. 4, an airtight seal forming unit 100 is provided between the container body 20 and the end plug 30 to seal the storage space.

[0067] Such an airtight sealing unit 100 is provided in a ring-shaped seal groove 32 formed between the end face of the container body 20 and the opposing surface of the end plug 30 that contacts the end face of the container body 20, and serves to seal the inside of the storage space.

[0068] In addition, the airtight seal forming unit 100 may specifically include a seal jacket 110 and a pressure spring 120. The details of each of these detailed components will be described later.

[0069] Furthermore, in this embodiment, the seal groove 32 has a recessed shape on the side of the end plug 30, but this is merely one example, and it goes without saying that the seal groove 32 may have a recessed shape on the side of the container body 20, or may have a recessed shape on both the end plug 30 and the container body 20.

[0070] FIG. 5 is a diagram showing the structure of an airtight seal forming unit 100 applied to a high-pressure fluid storage container 10 according to the first embodiment of the present invention.

[0071] As shown in FIG. 5, the seal jacket 110 is made of an elastic material and is configured to be able to fit into the seal groove 32, and has a shape in which an insertion space 111 having one open side is formed inside.

[0072] At this time, the seal jacket 110 can be disposed in the seal groove 32 so that the opening of the insertion space 111 faces the direction of the storage space on the leakage path of the high-pressure fluid.

[0073] In this embodiment, the seal jacket 110 may also include a pair of tightly sealing portions 113 and a connecting portion 112 .

[0074] A pair of tightly contacting seal portions 113 are provided so as to come into contact with the end face of the container body 20 or the opposing face of the end plug 30, respectively.

[0075] The connecting portion 112 connects one side of the pair of tight seal portions 113 to each other, and forms the insertion space 111 together with the pair of tight seal portions 113 .

[0076] That is, the seal jacket 110 has an insertion space 111 formed therein, and the insertion space 111 has a shape in which an opening is formed in a partial area.

[0077] More specifically, in this embodiment, the outer surface of the connecting portion 112 may be formed with a lip 113a that protrudes in an outwardly curved shape.

[0078] Such a lip 113 can be elastically deformed while in contact with the end face of the container body 20 or the opposing face of the end plug 30, thereby improving airtightness.

[0079] In this embodiment, the connecting portion 112 may be formed with a separation prevention protrusion 113 b that extends toward the other connecting portion 112 on the opposite side and blocks a part of the opening of the insertion space 11 .

[0080] Such a separation prevention protrusion 113b can prevent the pressure spring 120 inserted into the insertion space 111 from coming off through the opening.

[0081] The pressure spring 120 is made of a metal material and is inserted into the insertion space 111, applying elastic pressure to both sides of the opening of the insertion space 111. As a result, the pressure spring 120 serves to bring the seal jacket 110 into close contact with the end surface of the container body 20 and the opposing surface of the end plug 30.

[0082] In this embodiment, the pressure spring 120 has a shape including an elasticity imparting portion 121 and a pair of pressure portions 122 .

[0083] Of these, the elasticity imparting portion 121 is curved and serves to generate elastic force.

[0084] In addition, the pressure applying portion 122 extends a predetermined length from both sides of the elasticity imparting portion 121, and when inserted into the insertion space 111, it serves to tightly adhere the pair of tightly contacting seal portions 113 to the end face of the container body 20 or the opposing face of the end plug 30, respectively.

[0085] That is, in this embodiment, the pressure spring 120 is characterized in that it is curved at a predetermined location to generate elastic force and has a cross section formed in the shape of an open curve.

[0086] This allows the present invention to provide a sealing force superior to that of conventional sealing means such as O-rings.

[0087] Other embodiments of the present invention will be described below. In each of the following embodiments, duplicated descriptions of components that are the same as those in the first embodiment will be omitted. Furthermore, in the following embodiments, components that are not shown in the drawings will be denoted by the same reference numerals as those in the first embodiment.

[0088] FIG. 6 is a diagram showing the state of the seal jacket 110 in the high-pressure fluid storage container 10 according to the second embodiment of the present invention.

[0089] In a second embodiment of the present invention shown in FIG. 6, a seal jacket 110 includes a connecting portion 112 and a tight seal portion 113, and is formed to have substantially the same overall shape as the first embodiment described above.

[0090] However, the seal jacket 110 of this embodiment is characterized by further including a gap sealing portion 114 formed on one side of the connecting portion 112 .

[0091] The gap sealing portion 114 is formed in a volume-expanding shape on one side of the connecting portion 112 so that it can fill the gap G (see Figure 8) formed at the connecting point between the container body 20 and the end plug 30, thereby preventing leakage of high-pressure fluid through the gap G.

[0092] In this embodiment, the gap sealing portion 114 is illustrated as having a cross-sectional arc shape, but the shape of the gap sealing portion 114 is of course not limited and can be changed.

[0093] FIG. 7 is a diagram showing the state of the seal jacket 110 in the high-pressure fluid storage container 10 according to the third embodiment of the present invention.

[0094] In the third embodiment of the present invention shown in FIG. 7, the seal jacket 110 also includes a connecting portion 112 and a tightly sealed portion 113, and is formed to have substantially the same overall shape as the first embodiment described above.

[0095] However, the seal jacket 110 of this embodiment is characterized by further including an auxiliary groove 115 recessed from the inside of the insertion space 111 toward the connecting portion 112 side.

[0096] The auxiliary grooves 115 serve to allow the pair of tightly contacting seal portions 113 to more easily expand when they are elastically deformed outward by the pressure springs 120 .

[0097] In this embodiment, the inner surface of the auxiliary groove 115 is formed as a curved surface overall so as not to be easily damaged, but the shape of the auxiliary groove 115 can also be modified in various ways.

[0098] FIG. 8 is a diagram showing the inside of the seal groove 32 and the seal jacket 110 in the high-pressure fluid storage container 10 according to the fourth embodiment of the present invention.

[0099] In the fourth embodiment of the present invention shown in FIG. 8, the seal jacket 110 also includes a connecting portion 112 and a tightly sealed portion 113, and is formed to have substantially the same overall shape as the previously described embodiments.

[0100] However, in this embodiment, the container body 20 is formed with a fluid blocking projection 21 that projects toward the internal space of the seal groove 32 by a predetermined length.

[0101] In addition, in this embodiment, the seal jacket 110 has a shape in which a protrusion insertion groove 116 is formed that is recessed in a shape corresponding to the fluid cutoff protrusion 21 and into which the fluid cutoff protrusion 21 can be inserted, based on the state in which the seal jacket 110 is inserted into the seal groove 32.

[0102] As a result, in this embodiment, when the seal jacket 110 is inserted into the seal groove 32, the fluid blocking protrusion 21 is inserted into the protrusion insertion groove 116 of the seal jacket 110, so that the flow of high-pressure fluid into the gap G between the container body 20 and the end plug 30 inside the storage space of the high-pressure fluid storage container 10 can be physically blocked.

[0103] FIG. 9 is a diagram showing the state of the inside of the seal groove 32 in the high-pressure fluid storage container 10 according to the fifth embodiment of the present invention.

[0104] The fifth embodiment of the present invention shown in Figure 9 is characterized in that a plurality of adhesion protrusions 22, 33 protruding toward the internal space of the seal groove 32 are sequentially arranged on each of the end face of the container body 20 and the opposing face of the end plug 30.

[0105] These tight-fitting protrusions 22, 33 can apply strong pressure to the outer surface of the tight-fitting seal portion 113 when the seal jacket 110 is inserted into the seal groove 32, thereby maximizing the sealing effect.

[0106] Although the preferred embodiments of the present invention have been described above, it will be apparent to those skilled in the art that the present invention may be embodied in other specific forms other than those described above without departing from the spirit and scope of the present invention. Therefore, the above-described embodiments are considered to be illustrative rather than limiting, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents. [Explanation of symbols]

[0107] 10. High-pressure fluid storage vessel 20 Container body 20a plug connection 21 Fluid blocking protrusion 22, 33 Adhesion protrusion 30 end plugs 31 Fluid passage hole 32 Seal groove 100 Airtight Forming Unit 110 Seal Jacket 111 Insertion Space 112 Connection section 113 Close seal part 113a Lip 113b Anti-detachment protrusion 114 Gap sealing part 115 Auxiliary groove 116 Protrusion insertion groove 120 Pressure spring 121 Elasticity imparting part 122 Pressure section C. Anti-embrittlement treatment layer

Claims

1. a container body having a storage space formed therein for storing a high-pressure fluid and a plug coupling portion formed at at least one of both ends; an end plug coupled to the plug coupling portion and having a fluid passage hole formed therein through which a fluid flows; Including, At least the area where the plug joint portion and the end plug come into contact with each other is provided with an embrittlement-resistant surface treatment layer that is surface-treated to prevent oxidation and hydrogen embrittlement. A high-pressure fluid storage vessel.

2. The embrittlement-resistant treatment layer is formed on both the plug coupling portion and the end plug.

2. The high pressure fluid storage vessel of claim 1.

3. The container body and the end plug are made of a steel material containing chromium (Cr).

3. The high-pressure fluid storage vessel of claim 2.

4. A container body having a storage space formed therein for storing a high-pressure fluid and a plug coupling portion formed at at least one of both ends; an end plug coupled to the plug coupling portion and having a fluid passage hole formed therein through which a fluid flows; Including, an embrittlement-resistant layer that is surface-treated to prevent oxidation and hydrogen embrittlement is formed at least in a region where the plug coupling portion and the end plug contact each other; The embrittlement-resistant treatment layer is formed on both the plug coupling portion and the end plug, A high-pressure fluid storage container, wherein the container body and the end plug are made of a steel material containing chromium (Cr), A method for producing the embrittlement-resistant treatment layer, comprising: (a) inserting the plug coupling portion and the end plug into a chamber; (b) injecting air into the chamber and primarily heating the plug coupling portion and the end plug in an atmospheric environment; (c) evacuating the air in the chamber; and (d) injecting hydrogen into the chamber and secondarily heating the plug joint and the end plug in a hydrogen atmosphere.

1. A method for manufacturing an embrittlement-resistant treated layer for a high-pressure fluid storage container, comprising:

5. In the step (b), the plug joint and the end plug are heated to a temperature of 600°C to 900°C in an atmospheric environment. A method for manufacturing the embrittlement-resistant treated layer of the high-pressure fluid storage container according to claim 4.

6. In the step (d), In a hydrogen atmosphere, the water vapor partial pressure is 10 －８ ~10 －１ MPa and heated to a temperature of 1000 to 1200°C. A method for manufacturing the embrittlement-resistant treated layer of the high-pressure fluid storage container according to claim 4.

7. The container further includes an airtight seal unit provided in a ring-shaped seal groove formed between the end surface of the container body and an opposing surface of the end plug that contacts the end surface of the container body, and that seals the inside of the storage space.

2. The high pressure fluid storage vessel of claim 1.

8. The airtight sealing unit comprises: a seal jacket made of an elastic material and adapted to be fitted into the seal groove, the seal jacket having an insertion space therein and one side of which is open; a pressure spring formed of a metal material and inserted into the insertion space to apply elastic pressure to both sides of the opening of the insertion space, thereby tightly contacting the seal jacket with the end surface of the container body and the opposing surface of the end plug.

8. The high pressure fluid storage vessel of claim 7.

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