| Earthquake has the largest destructive among all the natural disasters, it threat to human survival and development seriously, because of its sudden, difficult to estimate and devastating. At present about the structure of the earthquake is mainly concentrated in its entirety and rationality, but when the earthquake occurring, building components will broke under a lot of local forces. So the seismic performance of steel and the structural design of buildings are equally important in the research on seismic performance of buildings. This article write the experiment research in the process of seismic steel manufacture development of Kunming iron and steel company, in order to provide guidance meaning and reference value in the process of China’s earthquake area steel choosing and higher seismic performance of steel production and development.At first, We did the experiment research and statistical analysis of KR iron pretreatment, the converter smelting and LF furnace refining of Q235KZB earthquake resistant steel plate. The results showed that after the process optimization measures of KR iron pretreatment are put forward and executed strictly, The desulfurization efficiency of KR iron pretreatment increased by 26.1%, and the volatility of the Slag material consumption in the the converter smelting process. The control stability should to be improved, but the amount of overall slag material consumption is not high, The steel average temperature of the converter smelting is 1644℃, The carbon’s success rate is higher than before, we join 100kg lime and 50kg refining slag to wash the liquid steel when the converter smelting end. The oxygen activity control in 20-60ppm and 15-30ppm when the liquid steel enter and came out the LF refining furnace, The deoxidization effect is stable, and there are certain desulfurization effect.Second, the paper researched influence of electromagnetic stirring and its frequency for the microstructure and seismic performance of seismic steel in the process of continuous casting. The results showed that when the electromagnetic stirring process was used in the process of continuous casting, slab solidification organization become more uniform, casting defects become lighter, the C, P, S segregation of the thickness of the center become lighter, the microstructure of stell plate become more homogeneous and the seismic performance of steel plate was improved. Compared the casting organization, the casting defects, the microstructure and the seismic performance of five groups electromagnetic stirring process, the best electromagnetic stirring frequency is 9 Hz.Finally, the paper designed three kind of thermal mechanical rolling technology of high temperature, medium temperature, low temperature, and researched the impact of three kind of thermal mechanical rolling technology to the microstructure and the seismic performance. The results showed that the matrix organization of earthquake resistant steel plate was ferrite and pearlite, high temperature and low temperature finishing settle department organization appear few free cementite along the grain boundary distribution, the ferrite grain size of the 1/2 and the 1/4 of the thickness in medium temperature high magnitude of 0.5 than the ferrite grain size of the 1/2 and the 1/4 of the thickness in high temperature and low temperature, the highest edge ferrite grain size is 11.5 when finish rolling in low temperature. The seismic steel plate has the best seismic performance when medium finish rolling from the several important indicators of seismic performance showed, break elongation, reduction of area. The comprehensive seismic qualification rate is highest when medium finish rolling, at 85.7%, the second is 61.8% when finish rolling in low temperature, the min is 51.7% when finish rolling in high temper.
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