METAL COMPOSITE CYLINDER FOR STORAGE OF COMPRESSED HYDROGEN Russian patent published in 2024 - IPC F17C1/00 C22C38/00 C22C38/08 C22C38/18 

FIELD: gas industry.

SUBSTANCE: invention relates to gas equipment and can be used for pressure cylinders for storage and transportation of compressed hydrogen. Metal-composite cylinder for storage of compressed hydrogen under high pressure contains a thin-wall sealing liner in the form of a hollow equal-thickness cylindrical shell with shaped bottoms contacting and welded in one of the bottoms along the perimeter of the through hole with pole unions. Besides, it comprises outer structural shell made of composite material formed by combination of multizone families-layers of reinforcing material high-modulus fibers oriented in spiral and circumferential directions with preset linear densities. Liner is made from cold-drawn thin-walled sheet of metastable austenitic stainless steel, in which as-delivered relative elongation at tension is not less than 55–60% at anisotropy coefficient, which is represented as ratio of logarithmic deformations along length to deformations along width, not more than 0.8, carbon equivalent C_eq of not more than 0.55%, ratio of equivalent value on chromium Cr_eq to value of equivalent on nickel Ni_eq 1.3–1.8, ferrite number Fn is not more than 10, PRE_N is more than 22, temperature of the beginning of martensitic transformation Mn (Ms) is not higher than −350 °C and temperature value Md₃₀ is less than −170 °C, in the form of a three-part welded shell of rotation, wherein the middle cylindrical part of the shell of the liner throughout the volume has an austenitic microstructure containing not more than 4–6 vol.% of a mixture of fine-grained lower bainite and fine-grained reticular martensite. Shape of the generatrixes of the liner bottoms is selected based on the condition of equality of the meridian and annular deformations of the cylinder as a whole, which occur under the action of working pressure, and their maximum depth is determined with observance of restrictions during their formation by means of cold plastic deformation. Liner bottom material also has an austenitic microstructure containing not more than 10–12 vol.% of deformation α'-martensite when viewed in a transverse thin section, wherein in the zone of contact with the pole metal unions, the shapes of the bottoms have the shape of annular plates, the diameter of which is at least 10% greater than the maximum diameter of the contact plane of the nozzle.

EFFECT: providing reliable operation of the cylinder.

6 cl