Steel made of boron containing microalloy and resisting atmosphere corrosion and manufacturing method of steel

Abstract

The invention relates to steel made of boron containing microalloy and resisting atmosphere corrosion, and a manufacturing method of the steel. Steel containing boron and resisting atmosphere corrosion is produced through twin-roll thin strip continuous casting, a crystal roll produced through strip casting is sprayed with dry ice, cast strips are uniformly cooled in an strengthened manner, and are cooled below 1,280 DEG C quickly, the cooling rate is 200 to 300 DEG C/s, the strip steel subjected to boronizing is cooled in such a cooling way to promote the separation-out of thick and large BN (Boron Nitride), prevent the occurrence of low-melting-point B2O3 and the separation-out of fine ALN and achieve the purposes of uniforming austenite crystals and reducing the tensile ratio; and then, austenite is subjected to on-line recrystallization rolling, atomoization cooling and coiling. Through the invention, the steel with lower tensile ratio can be manufactured, the problems of steel produced through strip casting that the structure is non-uniform, the tensile ratio is higher, the moulding is difficult, and the requirement of cold rolled material cannot be met are effectively solved, the use requirement of cold rolled base materials is met, and the steel can be directly used in a way of replacing the cold rolling by the hot rolling.

Description

technical field [0001] The invention belongs to the continuous casting process and products in the metallurgical industry, and is mainly used for thin strip steel products produced by the twin-roll thin strip continuous casting process, and is especially suitable for producing a boron-containing atmospheric corrosion-resistant steel thin strip. Background technique [0002] Traditional thin strips are mostly produced by multi-pass continuous rolling of cast slabs with a thickness of 70-200mm, while cast strips produced by twin-roll thin strip continuous casting process are rolled into hot strips in one or two passes. The rolled strip can be put into the market. Compared with the traditional strip production process, the former has a shorter production line and requires less energy. It is a low-carbon and environmentally friendly hot-rolled thin strip production process. [0003] The typical technological process of twin-roll thin strip continuous casting is: molten steel in...

AI Technical Summary

Problems solved by technology

Thin strip continuous casting can solve the problems of uneven structure, high yield ratio and poor formability when producing this kind of steel, so as to meet the use requirements of cold-rolled base material and "replacing cold with heat" products

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