A highly weather-resistant, low-cost seawater corrosion-resistant steel bar and its production process

Abstract

The invention provides a steel bar with high weather resistance, low cost and seawater corrosion resistance and a production process. The steel bar comprises the following elementary compositions of,by weight, 0.04%-0.10% of C, 0.10%-0.50% of Si, 0.5%-1.6% of Mn, 0.03% or less of P, 0.02% or less of S, 2%-4% of Cr, 0.3%-0.5% of Cu, 0.2%-0.6% of Ni, and the balance Fe and inevitable impurities. According to the steel bar, the mechanical property meets the requirement of the steel bar for corrosion resistance, the aging strain is low, and the corrosion rate is lower than 70% that of common steel bars. The technical path of the process comprises a 70-ton ultrahigh-power electric furnace, LF ladle refining, deoxidation and alloying after steel discharging, argon blowing, continuous casting of165 square billets at four streams by four machines, a heat accumulating type stepping heating furnace, 18 non-twist tandem mills, controlled-rolling and controlled-cold cooling, finishing, packagingand storage.

Description

technical field [0001] The invention belongs to the field of iron metallurgy, and in particular relates to a high-weather-resistant, low-cost seawater corrosion-resistant steel bar and a production process. Background technique [0002] As an important building material, steel bars are widely used in modern engineering construction. During use, steel bars are not only required to have a certain strength to withstand various forces, but also require them to have certain corrosion resistance. Especially in a corrosive environment with chloride salt as the medium, chloride ions will penetrate into the concrete, destroy the passivation film on the surface of the steel bar, cause corrosion of the steel bar, and cause concrete cracking and spalling, reducing the service life of the reinforced concrete structure. At present, some coastal areas in China Delay-penetration corrosion of steel matrix is ​​delayed by adding antirust solution to reinforced concrete structure, but the chem...

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Problems solved by technology

However, no research has been carried out on its corrosion resistance, strength, and aging properties, and the steel billets have not been stacked and cooled slowly, and the process parameters of the hot rolling process have been optimized to obtain ideal metallographic structure and grain size matching

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