Nickel-based flux-cored wire for LNG storage tank and preparation method and application of nickel-based flux-cored wire

By optimizing the cladding and flux composition of the nickel-based flux-cored welding wire for austenitic submerged arc welding of LNG storage tanks, the problem of mismatch between the mechanical properties of the weld and 9Ni steel was solved, achieving high strength and toughness of the weld at -196℃, extending the service life of LNG storage tanks and reducing production costs.

CN122252860APending Publication Date: 2026-06-23CHINA IRON & STEEL RESEARCH INSTITUTE GROUP CO LTD
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Patent Information

Application Number
CN202411879280.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The mechanical properties and toughness of the weld seam produced by the welding wire currently used for welding 9Ni steel plates do not match those of 9Ni steel, resulting in a short service life for LNG storage tanks.

Method used

A nickel-based flux-cored welding wire for austenitic submerged arc welding of LNG storage tanks is provided. By optimizing the composition and content of the cladding layer and the flux core, and controlling the proportion of harmful phases in the weld metal, the welding wire prepared by using nickel-chromium alloy strip and flux core powder has low-temperature impact toughness, high tensile strength and yield strength at -196℃, which are comparable to those of 9Ni steel.

Benefits of technology

The tensile strength of the weld is 724-748MPa, the impact energy is 85-93J, and the yield strength is 362-384MPa, which meets the service requirements of welded joints for LNG storage tanks, increases the service life to 50 years, and reduces production costs by more than 30%.

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Abstract

The invention discloses a nickel-based flux-cored wire for an LNG (Liquefied Natural Gas) storage tank as well as a preparation method and application of the nickel-based flux-cored wire, belongs to the technical field of welding material flux-cored wires, and solves the problem that the service life of the storage tank is short due to the fact that the mechanical property and the toughness of a welding seam are not matched with those of 9Ni steel after the welding of an existing welding wire for welding a 9Ni steel plate. The nickel-based flux-cored wire comprises a flux core and a wrapping layer wrapping the flux core. The coating layer comprises the following components in percentage by mass: Clt; 0.015% of St, 14.5%-20.0% of Cr, 0.015%-0.015% of St; 0.04%, Plt; 0.04%, with the balance being Ni and inevitable impurities; the flux core is prepared from, by mass, 0.5%-2.5% of Co, 13.0%-18.0% of Cr, smaller than 0.15% of Si, 0.01%-0.03% of Al, 0.001%-0.02% of Mn, 15%-17% of Mo, 10%-20% of W, 10%-15% of Fe and the balance Ni and inevitable impurities.
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