Multilayer composite slab for manufacturing extra-thick steel plates and method for manufacturing the same

JP7877570B2Active Publication Date: 2026-06-22ANSTEEL BEIJING RES INST CO LTD
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Patent Information

Application Number
JP2025500985
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2023-03-03
Filing Date
2023-11-24
Publication Date
2026-06-22
Estimated Expiration
2043-11-24

AI Technical Summary

Technical Problem

Existing multilayer composite slabs for ultra-thick steel plates face issues with large deformation elasticity during rolling, leading to defects such as unbonded material and delamination at the composite interfaces, despite optimized vacuum electron beam welding processes.

Method used

A multilayer composite slab structure with inclined surfaces and alternating welding using an acute isosceles triangle trajectory for vacuum electron beam welding, combined with gaskets at the interface, to enhance mechanical bonding and metallurgical bonding forces.

Benefits of technology

The method effectively improves the mechanical bonding force at composite interfaces, reducing defects like delamination and unbonding, ensuring high bonding rates and reliable joints during rolling.

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Patent Text Reader

Abstract

The present invention relates to a multi-layer composite slab for manufacturing an extra-thick steel plate and a manufacturing method thereof, which includes an upper layer slab, an intermediate layer slab, and a lower layer slab. The surfaces where the upper layer slab and the lower layer slab are composite are inclined surfaces respectively, both side surfaces of the intermediate layer slab are inclined surfaces, and the inclined surfaces of the upper layer slab, the inclined surfaces of the lower layer slab, and the inclined surfaces of both sides of the intermediate layer slab are parallel to each other. To achieve the above object, the present invention adopts the following technical means. By optimizing and improving the structure of the multi-layer extra-thick composite slab and adopting a welding technique that scans in an "acute triangle", a multi-layer extra-thick composite slab that can be welded well can be obtained. In subsequent rolling composite, the mechanical bonding force of the composite interface can be effectively improved, avoiding defects such as interlayer delamination and non-bonding at the composite interface, and ensuring the bonding rate of the composite interface.
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Citation Information

Patent Citations

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