Production method of ultra-thin specification hot rolling punching steel with tensile strength of 390-510 MPa

Abstract

The invention discloses a production method of ultra-thin specification hot rolling punching steel with the tensile strength of 390-510 MPa, and belongs to the technical field of metallurgy panels. The production method comprises the following steps of converter smelting, LF furnace refining, continuous casting, heating furnace heating, high-pressure water descaling before rough rolling, two-rack rough rolling, high-pressure water descaling before fine rolling, five-rack fine rolling, laminar cooling and coiling. By means of the component design and reasonable heating, rolling and cooling technology of a low-carbon and low-manganese V microalloying system, the rolling difficulty is lowered, cold-formed ultra-thin hot rolling punching steel strips good in welding performance are produced, and the improvement of the product profit space and the popularization of the ultra-thin hot rolling punching steel strips are facilitated.

Description

technical field [0001] The invention relates to the technical field of metallurgical plates, in particular to a method for producing ultra-thin hot-rolled stamping steel with a tensile strength of 390-510 Mpa. Background technique [0002] In recent years, "replacing cold with heat" has gradually become one of the hot issues in the development of thin slab continuous casting and rolling products. It has become sufficient to replace ordinary cold-rolled cold-formed sheets and cold-rolled sheets for stamping by using thin-slab processes to produce hot-rolled sheets. The development direction is to give full play to the advantages of the production line, expand the range of varieties, and reduce the cost of the process. However, due to the high load of the rolling mill for thin-gauge products, especially products with a thickness below 1.4mm, rolling is difficult and the risk of stacking steel is high. In addition, in terms of composition design, Generally, C and Mn strengtheni...

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Problems solved by technology

[0002] In recent years, "replacing cold with heat" has gradually become one of the hot issues in the development of thin slab continuous casting and rolling products. It has become sufficient to replace ordinary cold-rolled cold-formed sheets and cold-rolled sheets for stamping by using thin-slab processes to produce hot-rolled sheets. The development direction is to give full play to the advantages of the production line, expand the range of varieties, and reduce the cost of the process. However, due to the high load of the rolling mill for thin-gauge products, especially products with a thickness below 1.4mm, rolling is difficult and the risk of stacking steel is high. In addition, in terms of composition design, Generally, C and Mn strengthening methods are adopted, and the cold forming performance is poor. However, steel strips with good cold forming performance usually adopt the method of Nb, V or Ti composite strengthening. The production cost is high, resulting in small profit margins and great limitations. The promotion and use of ultra-thin steel strips for stamping, so it is necessary to find a production method for ultra-thin steel strips with less alloying elements and good cold forming properties

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