Low-molybdenum high-titanium 590MPa-grade fire-retardant steel plate for building and preparation method of steel plate

Abstract

The invention discloses a low-molybdenum high-titanium 590MPa-grade fire-retardant steel plate for building. The fire-retardant steel plate comprises the following chemical components in percentage by weight: 0.04-0.12% of C, 0.10-0.35% of Si, 0.6-1.2% of Mn, 0.015-0.045% of Al, 0.10-0.50% of Cr, 0.01-0.25% of Mo, 0.015-0.035% of Nb, 0.05-0.12% of Ti, no more than 0.004% of N, no more than 0.003% of O, no more than 0.015% of P, no more than 0.005% of S, and the balance of Fe and inevitable impurities being less than or equal to 0.05%. The invention further provides a preparation method of the corresponding fire-retardant steel plate. The fire-retardant steel plate contains less precious metals Mo and Nb, does not contain Ni, nano-carbide precipitation of cheap metal Ti is creatively utilized and strong and dispersively distributed TiC is obtained, so that the high-temperature strength can be effectively enhanced, the welding performance can also be improved, and the alloy cost can be greatly lowered. The low-molybdenum high-titanium 590MPa-grade fire-retardant steel plate is produced by adopting controlled rolling and controlled cooling technology, is free from follow-up thermal treatment, simple in production operation, low in technological cost, and high in production efficiency.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a low-molybdenum and high-titanium 590MPa high-performance fire-resistant steel plate for building structures and a manufacturing method thereof. Background technique [0002] As an important structural form of modern buildings, steel structures represent a new trend in the development of today's building structures, expand the application of steel products, and promote the development of steel for construction. However, there is a fatal flaw in steel structure buildings, that is, poor fire performance. In order to prevent fire from causing catastrophic damage to steel structure buildings and ensure the safety of personnel and property, building standards stipulate that fire-resistant coatings should be used to protect steel structures. However, spraying refractory coating will pollute the environment, prolong the construction period and increase the cons...

AI Technical Summary

Problems solved by technology

So far, there is no report on refractory steel products with high strength, high toughness and good shock resistance by adding an appropriate amount of cheap metal Ti to reduce precious metals Mo, Nb, etc.

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