EFFECT OF REMOVING HYDROGEN FROM HEAVY RAIL STEEL BLOOMS BY STACK COOLING IN PANZHIHUA IRON AND STEEL COMPANY

摘要

The determination of dffusible hydrogen in U71Mn heavy rail steel,and hydrogen diffusivityas well as the hydrogen distribution in the cross section of blooms with stack cooling were stu-died.The results showed that,most of the hydrogen in blooms of heavv rail steel is diffusible,the hydrogen diffusivity in U71Mn rail steel blooms at room temperature is（0.85—1.02）×10-6cm2/s,after stack cooling,the hydrogen content in bloom will decrease greatly which ishelpful to form the flake-free phenomenon in the heavy rail produced by Panzhihua Iron andSteel Company.