A kind of 225mpa level weather resistance low yield point damper steel plate and steel strip preparation method

Abstract

The invention discloses 225MPa level weather resistance low-yield-point damper steel and a preparing method. The 225MPa level weather resistance low-yield-point damper steel comprises chemical components including 0.03 wt%-0.06 wt% of C, 0.01 wt%-0.03 wt% of Si, 0.15 wt%-0.25 wt% of Mn, smaller than or equal to 0.020 wt% of S, 0.040 wt%-0.065 wt% of P, 0.040 wt%-0.070 wt% of Als, 0.35 wt%-0.60 wt%of Cr, 0.25 wt%-0.45 wt% of Ni, 0.20 wt%-0.40 wt% of Cu, smaller than or equal to 0.0040 wt% of N, smaller than or equal to 0.0020 wt% of O, smaller than or equal to 0.0001 wt% of H and the balance Fe and inevitable impurities. A 225MPa level weather resistance low-yield-point damper steel plate and a steel strip are obtained through the steps of blast furnace molten iron pretreatment desulfuration, molten iron converter smelting, molten steel deoxygenation alloying, molten steel LF furnace refining, molten steel VD vacuum refining, molten steel pouring, steel blank heating, steel blank descaling, steel blank controlled rolling and controlled cooling, refined rolling, cooling and the like. The defect that existing low-yield-point damper steel is poor in weather resistance is overcome, accordingly, the service life of a damper is prolonged, and the using and maintaining cost is reduced.

Description

[0001] Technical field [0002] The invention belongs to the technical field of metallurgy, and in particular relates to a 225MPa grade weather-resistant low-yield-point damper steel and a preparation method thereof. Background technique [0003] 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 s...

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Problems solved by technology

These patent documents all involve the manufacture of 225MPa 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 225MPa grade weather-resistant low-yield-point damper steel and a preparation method thereof, to solve the problem of poor weather resistance of the existing low-yield-point damper steel, so as to prolong the service life of the damper and reduce the use and maintenance cost

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