Cryogenic tank and method for manufacturing it

The use of work-hardened 201LN austenitic stainless steel sheets in cryogenic containers addresses the challenge of mechanical strength and cracking resistance at low temperatures, achieving enhanced performance and cost-effectiveness.

JP2026517286APending Publication Date: 2026-05-28CRYOLOR
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Patent Information

Application Number
JP2025568191
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-05-22
Filing Date
2024-04-24
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing cryogenic containers face challenges in using low-cost materials that provide improved mechanical strength and resistance to cracking at low temperatures, particularly at welds, while maintaining resilience and cost-effectiveness.

Method used

The use of 201LN austenitic stainless steel sheets work-hardened to a rate of 1 to 12%, preferably 5 to 10%, preferably 6%, through pressurization with an incompressible fluid like water, before or after assembly, and welded using specific flux and wire pairs, enhancing mechanical properties and resistance to cracking.

Benefits of technology

The solution provides superior mechanical strength and resistance to cracking at low temperatures, reducing costs and maintaining resilience, with optimal performance achieved at a work-hardening rate of 6 to 10%, especially at welds and edges.

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Abstract

The present invention relates to a cryogenic tank configured for storing liquefied gas, such as liquid nitrogen, at cryogenic temperatures preferably below -100°C, and a method for manufacturing the same, wherein the tank (1) consists of a set of welded 201LN type austenitic stainless steel sheets, and the tank is work-hardened at a work-hardening rate of 1 to 12%, preferably 5 to 10%, that is, the set of welded 201LN type austenitic stainless steel sheets is work-hardened at a work-hardening rate of 1 to 12%, preferably 5 to 10%.
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