Low-alloy, high-strength and high-weather-resistance structural steel for highway guardrails and preparation method thereof

Abstract

The invention relates to the field of production and manufacturing of structural steel for highway guardrails, in particular to low-alloy, high-strength and high-weather-resistance structural steel for highway guardrails and a preparation method of the low-alloy, high-strength and high-weather-resistance structural steel. The low-alloy, high-strength and high-weather-resistance structural steel comprises, by mass, less than or equal to 0.12% of C; less than or equal to 0.65% of Si; less than or equal to 1.20% of Mn; 0.07-0.12% of P; less than or equal to0.030% of S; 0.20-0.55% of Cu; 0.30-1.25% of Cr; 0.12-0.65% of Ni; less than or equal to0.03% of Nb; less than or equal to 0.05% of Al, and the balance Fe. On the basis of existing low-alloy high-strength weather-resistant steel, the compactness of a rust layer is improved by optimizing the P element, and then the weather resistance of the structural steel is improved; the Cr content, the rust layer compactness and the pearlite content are improved, and the weather resistance and the mechanical property of the structural steel are improved; and the Nb element is increased, the grain size of the steel is refined, and the comprehensive mechanical property of the material is improved. The structural steel can meet the requirements of road guardrails on weather resistance and strength performance.

Description

technical field [0001] The invention relates to the field of manufacturing structural steel for road guardrails, in particular to a low-alloy, high-strength, high-weathering structural steel for road guardrails and a preparation method thereof. Background technique [0002] As an important traffic safety facility, the anti-collision guardrail on the highway is of great significance to prevent accidents, reduce the severity of accidents and effectively protect people's life and property safety. In the "Code for Design of Highway Traffic Safety Facilities" JTGD81-2017 implemented on January 1, 2018 in my country, the third level (A), that is, the 160kj guardrail guardrail, uses a large amount of three-wave beam steel, which also increases the construction cost of the expressway accordingly. At present, most highway guardrails made of traditional materials use steel with a yield strength of 235MPa, which has low strength and a large amount of materials; at the same time, it nee...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a low-alloy, high-strength, high-weather-resistant structural steel for highway guardrails and a preparation method thereof, which solves the technical problem that the existing technology has no high-weather-resistant structural steel in steel with a yield strength of 415MPa, thereby solving the problem of domestic industry blank

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