Ferrite-martensite dual-phase hot-rolled pickled plate for wheel spoke and preparation method thereof

Abstract

The invention belongs to the technical field of special steel plate preparation, and particularly provides a ferrite-martensitic double-phase hot-rolled pickling plate for wheel spokes and a preparation method thereof, the ferrite-martensitic double-phase hot-rolled pickling plate comprises the following components by weight: 0.05-0.07% of C, 0.40 to 0.60% of Si, 1.20% to 1.50% of Mn, less than orequal to 0.020% of P, less than or equal to 0.010% of S, 0.020%-0.070% of Alt, 0.30% to 0.40% of Cr, 0.10% to 0.20% of Mo, less than or equal to 0.006% of N and balance of Fe and unavoidable impurities. The ferrite-martensitic double-phase hot-rolled pickling plate adopts lower chromium and molybdenum contents, reduces the alloy cost, adopts a lower silicon content, reduces the difficulty of continuous casting production after steel making, improves the heat dissipation capacity and continuous casting ability of molten steel, and is beneficial to industrial mass production. By adopting of a two-stage cooling process, control variables are reduced, the operability and stability of the production are improved, and the coiling temperatureis appropriately increased to (350-400 DEG C). The higher the temperature, the lower the strength of the steel, and the loss of coiling equipment is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of special steel plates, and particularly provides a ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes and a preparation method thereof. Background technique [0002] Due to the ferrite-martensitic dual-phase steel has a large amount of ferrite with very little carbon content, it has a high elongation, and at the same time, the hard phase martensite is distributed in the ferrite crystals in an island shape. At the boundary, it not only plays the role of strengthening the matrix, but also increases the contact area of ​​the grain boundary, and also has the effect of strengthening the grain boundary, so that the dual-phase steel with this structure has the advantage of better matching of strength and plasticity. [0003] Due to the complex forming of the wheel spoke, the material is required to have a low yield strength to achieve easy forming, and a high tensile strength ...

AI Technical Summary

Problems solved by technology

The two schemes have their own advantages and disadvantages. Scheme ① has low alloy cost, and continuous casting after steelmaking is more difficult. Due to the three-stage cooling and low-temperature coiling, the difficulty of hot rolling production is greatly increased, and there are problems such as poor process repeatability and unstable performance. The cost of hot rolling is reduced, and the overall cost is relatively high; option ② adds higher chromium and molybdenum alloys, the cost of the alloy is high, the difficulty of steelmaking production is relatively low, and the hot rolling process is easier to realize