A production method of micro-titanium reinforced hot-rolled stamping steel strip based on thin slab process

Abstract

The invention discloses a production method of a micro-titanium enhanced steel belt for hot rolling stamping based on a sheet billet flow, and belongs to the technical field of metallurgy plate. The steel belt comprises the chemical components by the weight percentage: 0.04-0.06% of C, not more than 0.03% of Si, 1.30-1.50% of Mn, not more than 0.020% of P, not more than 0.008% of S, 0.020-0.040% of Ti, 0.020-0.040% of Als, not more than 0.0050% of N, and Fe and inevitable residual elements. The method adopts the processes: smelting with a revolving furnace, refining with a LF furnace, continuous casting, heating with a heating furnace, scale removal with high-pressure water before rough rolling, rough rolling with two machine frames, scale removal with high-pressure water before finish rolling, finish rolling with five machine frames, laminar cooling, and coiling. Through low carbon, high manganese and micro-titanium enhancement composition design and reasonable continuous casting, heating, rolling and cooling processes, the cold-formed micro-titanium enhanced steel belt for hot rolling stamping and with good welding property is produced.

Description

Technical field [0001] The invention relates to the technical field of metallurgical plate production, in particular to a method for producing micro-titanium-strengthened hot-rolled steel strips based on a thin slab process. Background technique [0002] Hot-rolled stamping steel strips are commonly used in the automotive industry and need to have good cold forming properties, such as lower yield ratio, higher elongation, higher hole expansion, etc. Therefore, low-carbon composition design is generally adopted. For steel grades with higher strength levels, such as those with a tensile strength exceeding 430MPa, if no microalloying elements are added, and only carbon-manganese solid solution strengthening is used, the performance stability is difficult to ensure. If the microalloying element Nb is added, it will pass The function of refining the grains ensures the strength, and the phenomenon that the yield strength is high, which is not conducive to stamping and forming, therefor...

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Problems solved by technology

[0002] Hot-rolled stamping steel strips are widely used in the automotive industry, and need to have good cold forming properties, such as low yield ratio, high elongation rate, high hole expansion rate, etc., so generally adopt low-carbon composition design, For steels with high strength grades, such as steels with a tensile strength exceeding 430MPa, if no microalloying elements are added and only carbon-manganese solid solution strengthening is used, the performance stability is difficult to guarantee. If the microalloying element Nb is added, it will pass The role of its grain refinement guarantees the strength, but there will be a phenomenon that the yield strength is relatively high and is not conducive to stamping. Therefore, it is necessary to design a chemical composition to make the steel strip have high strength and good plasticity at the same time.

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