# US 2021/0278043 A1 · Pressure vessel for hydrogen and method for manufacturing same

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- Number: US 2021/0278043 A1
- Document ID: US20210278043A1
- Status: Published application
- Kind: A1
- Application number: 16/315,287
- Filed: 2017-07-14
- Published: 2021-09-09
- Earliest claimed: 2016-07-15
- Assignees: The Japan Steel Works, Ltd.
- Applicants: The Japan Steel Works, Ltd.
- Inventors: Hironobu ARASHIMA; Yoru WADA; Yusuke YANAGISAWA
- Web page: https://patentgrep.com/patent/US20210278043A1

## CPC

- F17C 1/00: Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge (pressurised apparatus for purposes other than storage, see the relevant subclasses such as A62C, B05B; associated with vehicles, see the appropriate subclass of classes B60 - B64; pressure vessels in general F16J12/00 {; autoclaves B01J3/04; tank vehicles B60P3/22; railway tank wagons for carrying fluent materials B61D5/00; accumulators for supplying fluid under pressure F15B1/04; liquefied gas stoves F24C3/00})
- C21D 7/12: by expanding tubular bodies
- C22C 38/46: with vanadium
- F17C 2201/0119: with flat end-piece
- F17C 2201/0138: tubular
- F17C 2201/056: Small (<1 m3)
- F17C 2201/058: portable (<30 l)
- F17C 2203/0617: with one layer
- F17C 2203/0643: Stainless steels
- F17C 2203/0648: Alloys or compositions of metals
- F17C 2209/2181: Metal working processes, e.g. deep drawing, stamping or cutting
- F17C 2209/224: Press-fitting; Shrink-fitting
- F17C 2209/232: of walls
- F17C 2221/012: Hydrogen
- F17C 2223/0123: gaseous, e.g. CNG, GNC
- F17C 2223/036: Very high pressure (>80 bar)
- F17C 2260/011: Improving strength
- F17C 2260/012: Reducing weight
- F17C 2270/01: for fluid transport or storage
- F17C 2270/0139: Fuel stations
- H01M 8/04: Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- Y02E 60/32: Hydrogen storage
- Y02E 60/50: Fuel cells
- F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention provides a pressure vessel for hydrogen in which the development of cracking in the pressure vessel for hydrogen can be effectively inhibited and that is excellent in terms of safety, reliability, and durability. The present invention pertains to a pressure vessel for hydrogen in which a plastic region is present on the inner face side of a hydrogen pressure vessel main body, an elastic region is present on the outer face side, and compressive residual stress is generated on the inner face, wherein preferably: the equivalent plastic strain remaining on the inner surface of the hydrogen pressure vessel main body is 1% or below; the plastic region on the inner face side measures 50% or less of the wall thickness in the radial direction of the hydrogen pressure vessel main body; and the steel used has a tensile strength of at least 725 MPa.

## Claims

### Claim 1

A pressure vessel for hydrogen which is made of steel,
wherein a compressive residual stress is present on an inner surface side of a pressure vessel body for hydrogen, and
wherein an elastic region is provided on an outer surface side of the pressure vessel body for hydrogen.

### Claim 2 (depends on 1)

The pressure vessel for hydrogen according to claim 1, wherein an equivalent plastic strain remaining on an inner front surface of the pressure vessel body for hydrogen is 1% or less.

### Claim 3 (depends on 1)

The pressure vessel for hydrogen according to claim 1, wherein in a radial direction of the pressure vessel body for hydrogen, a plastic region on the inner surface side is 50% or less of a wall thickness

### Claim 4 (depends on 1)

The pressure vessel for hydrogen according to claim 1, wherein the steel used for the pressure vessel for hydrogen has a tensile strength of 725 MPa or more

### Claim 5 (depends on 4)

The pressure vessel for hydrogen according to claim 4, wherein the steel is a Cr—Mo steel, a Ni—Cr—Mo steel, or a Ni—Cr—Mo—V steel.

### Claim 6

A method of manufacturing a pressure vessel for hydrogen which is made of steel, the method comprising:
performing an autofrettage treatment by applying a pressure of an internal yield stress or higher of a pressure vessel body for hydrogen to an inside thereof; and
applying a compressive residual stress to an inner surface of the pressure vessel body for hydrogen.

### Claim 7 (depends on 6)

The method of manufacturing a pressure vessel for hydrogen according to claim 6, wherein after the pressure is unloaded, pressure is applied so that an equivalent plastic strain remaining on the inner front surface of the pressure vessel body for hydrogen is 1% or less.

### Claim 8 (depends on 6)

The method of manufacturing a pressure vessel for hydrogen according to claim 6, wherein after the pressure is unloaded, the pressure is applied so that a plastic region on the inner surface side is 50% or less of a wall thickness in a radial direction of the pressure vessel body for hydrogen.