High-strength hot rolled steel plate for glass lining and manufacturing method thereof

Abstract

The invention discloses a high-strength hot rolled steel plate for glass lining and a manufacturing method thereof. The high-strength hot rolled steel plate comprises, by weight, 0.06%-0.20% of C, 0-0.15% of Si, 0.80%-2.0% of Mn, 0.05%-0.12% of P, 0-0.020% of S, 0.09%-0.20% of Ti, 0.03%-0.07% of Nb, 0.01%-0.05% of V, 0.005%-0.050% of Als, 0-0.0060% of N, 0.5%-1.5% of Ti / C, and the balance Fe and inevitable impurities. The heating temperature of a continuous casting slab is 1180-1250 DEG C, the rolling temperature of the rough rolling stage is larger than or equal to 1100 DEG C, the rolling starting temperature of the precision rolling stage is 900-980 DEG C, the finish rolling temperature is 840-900 DEG C, the cooling speed of water cooling after rolling is controlled to be 10-40 DEG C / s, and the finish cooling temperature is 580-730 DEG C. The yield strength of the obtained steel plate is 450 MPa or above.

Description

technical field [0001] The invention relates to a hot-rolled steel plate for glass lining, in particular to a high-strength low-alloy hot-rolled steel plate for glass lining and a manufacturing method thereof. Background technique [0002] The so-called glass-lined refers to the coating of glass-lined enamel with high silicon content on the surface of metal (steel) and firing at high temperature to make the enamel adhere to the surface of the steel plate. Therefore, the glass-lined steel plate has the dual advantages of glass-like chemical stability and metal strength. It is precisely because of the unique properties of glass-lined steel plates that glass-lined steel plates are widely used in chemical, pharmaceutical, dye, pesticide, organic synthesis, petroleum, food manufacturing and defense industries to replace expensive stainless steel and non-ferrous metals. [0003] As the main manufacturing material of glass-lined equipment, the performance of steel plate directly a...

AI Technical Summary

Problems solved by technology

In this invention, the Si content is too high, and the Si element will first form an oxide film during the enamel firing process, which hinders the formation of an adhesive layer between the steel plate and the glass-lined glaze, which is unfavorable to the glass-lined adhesion

Moreover, the content of N element in the steel is high, and TiN inclusions are easy to precipitate at high temperature, and its size is large, which is not good for the ductility of the steel.

In addition, the strength level of this invention steel is 345MPa, which cannot meet the higher requirements for strength of glass-lined steel

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