A kind of high-performance elastic-plastic damping steel and its manufacturing method and application

Abstract

The invention relates to high-performance elastic-plastic damping steel and a preparation method and an application thereof. The high-performance elastic-plastic damping steel comprises the chemical composition by the mass percentage: not less than 24% and not more than 32% of Mn, not less than 3.5% and not more than 6.0% of Si, more than 1.0% and less than 2.5% of Al, not less than 0.005% and notmore than 0.1% of C, not more than 0.02% of P, not more than 0.03% of S, not more than 0.02% of N, and the balance Fe and unavoidable impurity elements, wherein the contents of Si and Al also need tosatisfy the following relationship: 2.0<Si / Al<=4.5. The high-performance elastic-plastic damping steel is prepared by the production process of casting, hot rolling, and annealing after hot rolling or the production process of casting, hot rolling, pickling, cold rolling, and annealing after cold rolling, the yield strength of the high-performance elastic-plastic damping steel is less than 380 MPa; under cyclic tensile-compressive loading conditions, when the strain amplitude, the strain ratio and the loading frequency are 1%, -1.0 and 0.1-0.2 Hz respectively, the stress amplitude is less than 550 MPa, and the fatigue life of the steel plate is more than 4000 cycles at room temperature.

Description

technical field [0001] The invention relates to a steel material, in particular to a high-performance elastic-plastic damping steel and its manufacturing method and application. Background technique [0002] Large-scale earthquakes and external long-term and long-period vibrations will cause great harm to high-rise buildings and structures. The elastic-plastic steel shock-absorbing dampers placed in buildings and structures can effectively absorb external vibration energy, and minimize the damage of buildings and structures. The elastic-plastic steel damper realizes the absorption of vibration energy through the first yielding of the steel under the action of external reciprocating vibration and the subsequent elastic-plastic hysteretic deformation. Therefore, the steel used for the damper (hereinafter referred to as "elastic-plastic damping steel") needs to have the following properties: low yield strength, stable hysteresis characteristics with full hysteresis curve, and ...

AI Technical Summary

Problems solved by technology

Under the action of alternating loads of the above-mentioned steels, cracks usually start earlier from stress concentration and strain incompatibility (such as dislocation slip bands, grain boundaries and ferrite / cementite phase boundaries) and dislocation cellular Induces, expands and finally causes fatigue failure of the material at the structure, so the fatigue life of the material is often low

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