SULFUR CONTENT CONTROL IN ULTRA-LOW SULFUR X80M PIPELINE STEEL
Through the precise control of the sulfur content in each process,S content after KR is about 0.002%,the endpoint S content of the converter is controlled at about 0.012%,alloy and aluminum iron are used for predeoxygenation during the steel output process,lime and specialized refined synthetic slag are used for the top slag of the ladle,thus the purpose of pre-deoxygenation and advance melting of slag is achieved,aluminum deoxygenation and slag surface diffusion deoxygenation such as silicon carbide are used to continuously produce high alkalinity white slag for deep deoxidation and desulfurization of molten steel during LF refining,the average S content of the steel is about 0.000 7% after LF refining,and the S content in the finished steel is about 0.000 8%,the ultra-low sulfur X80M pipeline steel produced by this method can meet the quality requirements.
万方数据
维普
