Preparation method of steel plate and steel strip for 160mpa level weather-resistant low yield point damper

Abstract

The invention discloses steel for a 160MPa grade weather-resistant low yield point damper and a a preparation method. The chemical components comprise 0.02-0.03wt% of C, 0.01-0.03wt% of Si, 0.10-0.25wt% of Mn, less than or equal to 0.015wt% of S, 0.030-0.050% of P, 0.025-0.045wt% of Als, 0.10-0.20wt% of Ni, 0.20-0.40wt% of Cr, 0.20-0.50wt% of Cu, 0.015-0.030wt% of Ti, 0.0010-0.0020wt% of B, less than or equal to 0.0040wt% of N, less than or equal to 0.0020wt% of O, less than or equal to 0.00015wt% of H, less than or equal to 0.25wt% of Ceq and the balance of Fe and inevitable impurities. A steel plate and a steel strip for the 160MPa grade weather-resistant low yield point damper are prepared by the following steps: pre-treatment desulfurization of blast furnace molten iron; converter smelting of molten iron; deoxidizing alloying of molten steel; LF furnace refining of molten steel; VD vacuum refining of molten steel; casting of molten steel; heating of a steel blank; descaling of the steel blank; controlled rolling and controlled cooling of the molten steel; finish rolling and cooling and the like. The steel disclosed by the invention overcomes the defect that existing steel for the low yield point damper is poor in weather resistance, so that the service life of the damper is prolonged, and the using and maintenance costs are lowered.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 160MPa grade weather-resistant low-yield-point damper steel and a preparation method thereof. Background technique [0002] Damper is a device for energy consumption and shock absorption in passive control of structures. Damper devices are installed in some parts of large and medium-sized steel structures (such as supports, shear walls, joints or connectors), and the use of dampers with low yield point steel It has excellent plastic deformation performance. During earthquake or wind vibration, the steel with low yield point of the damper undergoes plastic yield hysteretic deformation to dissipate the energy input into the structure, absorb the energy input into the structure by earthquake or wind vibration, and reduce the main body The earthquake response of the structure, so as to avoid the damage or collapse of the structure, and achieve the purpose of shock ab...

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Problems solved by technology

[0004] These patent documents all involve the manufacture of 160MPa low-yield steel. From the perspective of composition and performance, the steel types involved in the above documents have poor weather resistance, and it is necessary to apply anti-corrosion coatings to delay the corrosion of damper steel in the atmosphere. Extends the life of the damper

[0005] The invention relates to a 160MPa level weather-resistant low-yield point damper steel plate and a steel strip and a preparation method thereof to solve the problem of poor weather resistance of the existing low-yield point damper steel, prolong the service life of the damper, and reduce the use and maintenance cost

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