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Method of production of high-pressure seamless cylinder from corrosion-resistant steel

a production method and technology of steel, applied in the field of material forming, can solve the problems of inability to produce safe high-pressure seamless cylinders, inability to manufacture double-necked cylinders of a simple shape, considerable disadvantage, etc., and achieve the effects of reducing the mass of high-pressure cylinders, high mechanical resistance, and saving materials

Inactive Publication Date: 2018-10-25
VITKOVICE CYLINDERS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a method for making seamless cylinders that are strong, resistant to pressure, and made from corrosion-resistant steel. These cylinders are lightweight, can be made from a wider range of high-strength corrosion-resistant steels, and can be used for high-pressure applications. This method also allows for a reduction in the amount of material used for the production of these cylinders, making them easier to manipulate, store, and transport. Additionally, these cylinders can be used for gases and mixtures that may cause hydrogen embrittlement or corrosion in existing cylinders.

Problems solved by technology

Disadvantage of the existing procedures of production of high-pressure seamless cylinders is the fact that they do not allow production of cylinders from corrosion-resistant steels using the method of backward extrusion and drawing, because the corrosion-resistant material degrades when conventional method of backward extrusion and drawing is used and it is impossible to produce safe high-pressure seamless cylinder from it.
In a seamless form, however, only double-necked cylinders of a simple shape can be manufactured with these procedures, because they do not allow seamless closure of the bottom.
However, because it is not possible to produce sufficiently thin-walled tubes as the starting semi-product for these procedures, all such pressure bottles made using production methods based on pipes have thick-walled structure, and thus they have considerable disadvantage in a very big mass.
Especially in the case of bigger and big volumes, such big weight of cylinders complicates handling, storage, and transportation.
Existing thick-walled cylinders have another disadvantage in low strength.

Method used

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  • Method of production of high-pressure seamless cylinder from corrosion-resistant steel
  • Method of production of high-pressure seamless cylinder from corrosion-resistant steel
  • Method of production of high-pressure seamless cylinder from corrosion-resistant steel

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Embodiment Construction

[0022]Example of embodiment of the invention is visually demonstrated with the help of FIGS. 1 to 4 and the hereinafter-described method of production of corrosion-resistant high-pressure seamless cylinder for storage, transport, and use of natural gas.

[0023]Parts of the size needed for the manufacture of cylinders of the produced volume are first cut from billets of corrosion-resistant steel having square or circular section. Each individual part, i.e. the starting steel blank 1, is on at least 85% of its surface coated with coating 2 from material based on water glass. The thickness of applied layer is 20 to 150 μm. Suspension usually called water glass is used as the material based on water glass. For the purposes of the invention, the suspension based on water glass stands for suspension containing 20 to 40% w. w. of sodium silicate or potassium silicate or their mixture and 80 to 40% w. w. of water. Admixtures of borosilicates and corrosion inhibitors such as hexamine, fenyleth...

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Abstract

Blank of corrosion-resistant steel is coated with coating of water glass with thickness of 20 to 150 μm, cured at 15 to 60° C., and heated in an induction furnace to the temperature of 1180° C. to 1260° C. The heated up blank is without cooling by water descaling transferred into an extrusion press and extruded here, while the coating is broken to pieces and largely removed. Drawing in a horizontal drawing press and necking are performed. After forming to the final shape of the cylinder, leftovers of coating are removed by pressure blasting. A corrosion-resistant thin-walled seamless high-pressure cylinder with volume of 5 to 260 litres is manufactured.

Description

TECHNICAL FIELD[0001]The invention relates to the field of material forming, namely the method of production of high-pressure cylinder from corrosion-resistant steel using the method of hot backward extrusion solved completely specifically for the possibility to obtain high-pressure seamless cylinder not showing hydrogen embrittlement to and inner surface corrosion.BACKGROUND ART[0002]High-pressure seamless steel cylinders are currently produced using the method of backward extrusion and drawing utilizing the process according to the CZ pat. 243247.[0003]When using the procedure according to the CZ patent 243247, steel blanks are first cut from billets of square or circular section. The steel blanks are heated in an induction furnace to the output temperature of 1000 to 1250° C., after which they are robotically transposed into a descaling device where a high-pressure water jetting is performed to remove the scales from the surface of blanks. Then each individual blank is inserted b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B21C23/20B21C23/21
CPCB21C23/205B21C23/218B21C23/32B21C23/20
Inventor KUCERA, PAVELHOFRIK, PETRPIJANOWSKI, TOMAS
Owner VITKOVICE CYLINDERS AS
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