Low-cost low-yield-strength anti-knock steel and production method thereof

Abstract

The invention discloses low-cost low-yield-strength anti-knock steel and a production method thereof. The low-cost low-yield-strength anti-knock steel comprises, by weight percentage, not larger than 0.05% of C, not larger than 0.05% of Si, not larger than 0.60% of Mn, not larger than 0.010% of P, not larger than 0.005% of S, 0.015%-0.035% of Ti, 0.020%-0.050% of Alt and the balance Fe and inevitable impurities. The production method includes the steps of smelting, continuous casting, heating, controlled-rolling and controlled-cooling rolling and thermal treatment. By the adoption of composition design that only Ti is added based on low C and low Mn, in combination with the special controlled-rolling and controlled-cooling process and the thermal treatment process, the low-temperature flexible low-yield-strength anti-knock steel with the thickness reaching 80 mm is produced successfully, wherein the yield strength ranges from 205 MPa to 245 MPa, the tensile strength ranges from 300 MPa to 400 MPa, the yield ratio is smaller than or equal to 0.70, the specific elongation is larger than or equal to 50%, and -40 DEG C impact power is larger than or equal to 200 J. By the adoption of the method, the production cost is low, the process is simple, the product performance is excellent, and the comprehensive mechanical performance of products is stable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-cost low-yield-strength anti-seismic steel and a production method thereof. Background technique [0002] Seismic design is mainly to reduce earthquake damage by rationally distributing the inertial force and energy of the earthquake. At present, anti-seismic technology is divided into two types: traditional structure anti-seismic technology and energy consumption anti-seismic technology. Traditional structural anti-seismic technology mainly absorbs earthquake energy through the deformation of building columns and beams to achieve the purpose of anti-seismic. To improve the anti-seismic level of buildings, it is required that the size of structural support members be made as large as possible, which not only increases construction costs but also affects The beauty of the building. The energy-dissipating anti-seismic technology is to absorb the seismic energ...

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Problems solved by technology

However, the relative price of niobium element is high, which increases the production cost, and the thickness specification of the produced product is not large

[0005] The patent with the publication number CN104561777A discloses 225-grade low-yield-strength steel used in low-temperature harsh environments and its production method. It is based on low C and low Mn, adding various microalloying elements such as Ni, Nb, and Ti, and the composition is complex. And a variety of alloys lead to higher costs

[0006] The patent application with the publication number CN104233058A discloses an ultra-low-cost low-yield point steel and its production method. The grain size of this product is relatively coarse, and there is only test data for low-temperature toughness at 0°C, so it cannot be used at lower temperatures and worse natural environment

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