Soft magnetic structural steel plate with excellent welding performance and its making process

Abstract

The soft magnetic structural steel plate with excellent welding performance has very low C content, Si content of 1.45-1.65 wt%, medium Mn content, alloyed Ni and Cr, Ti content of 0.008-0.016 wt%, N content controlled to be lower than 0.0055 wt%, Ca or RE treatment, and optimized rolling and post-treatment process. It has excellent mechanical performance, good electromagnetic performance, excellent welding performance, excellent low temperature impact toughness, and capacity of being used in cold area.

Description

technical field [0001] The invention relates to a kind of maglev track beam special, which has high strength, excellent electromagnetic properties, low temperature toughness, good weldability, high magnetic flux density, high resistivity and excellent anti-magnetic timeliness, Atmospheric corrosion resistance, especially soft magnetic structural steel plates with excellent on-site welding processability and high electromagnetic properties, are especially suitable for use as side guide plates on maglev train track beams and other atmospheric corrosion-resistant engineering structural parts with electromagnetic performance requirements. Background technique [0002] Ordinary soft magnetic structural steel plates for magnetic levitation first appeared in Germany. Thyssen Steel AG applied for patents US 4350525 "Magneticsuspension railroad parts" and US Patent 6287395 "High-energy weldable soft magnetic steel plates" in the United States in 1982 and 1999 respectively. Steel and ...

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Problems solved by technology

However, the on-site welding process is not stable. The main reason is that the steel plate contains high Cu (~0.35%). When the on-site welding operation is improper, it is easy to form cracks in the grain boundary near the fusion line, resulting in component repair. Even scrapping will not only affect the project progress and cost, but more importantly, the crack-like grain boundary cracks near the fusion line will affect the safety of the engineering structure; During the heating process of the slab, the cracked grain boundary cracks on the surface are called copper brittleness, which affects the production process of the steel plate, and in severe cases, the slab or the steel plate will be scrapped, which not only increases the manufacturing cost of the steel plate, but more importantly, affects the manufacturing of the steel plate. cycle and delivery schedule, which in turn affects the progress of engineering construction; again, when there is a high Cu content in the steel, the magnetic flux density of the steel plate is reduced, the coercive force is increased, and the electromagnetic properties of the steel plate are reduced

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