A kind of low-alloy high-strength high-weathering structural steel for highway guardrail and preparation method thereof

Abstract

The invention relates to the field of manufacturing structural steel for highway guardrails, in particular to a low-alloy, high-strength, high-weathering structural steel for highway guardrails and a preparation method thereof. In terms of mass percentage, the chemical composition of structural steel is: C≤0.12%; Si≤0.65%; Mn≤1.20%; P: 0.07~0.12%; S≤0.030%; Cu: 0.20~0.55%; Cr: 0.30~1.25 %; Ni: 0.12~0.65%; Nb≤0.03%; Al≤0.05%, Fe is the balance. On the basis of the existing low-alloy high-strength weather-resistant steel, the present invention improves the compactness of the rust layer by optimizing the P element, thereby improving the weather-resistant performance of the structural steel; increasing the Cr content, increasing the compactness of the rust layer and the pearlite content, and improving the structure The weather resistance and mechanical properties of steel; increase the Nb element, refine the grain size of steel, and improve the comprehensive mechanical properties of materials. The invention can meet the requirements of the road guardrail 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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