Analysis on Related Reasons of White Band Appearance of 20 Steel for Continuous Casting Round Tube Blank
LI Xiangcai
DONG Juan
CUI Jianhai
ZHANG Linlin
GUO Fajun
Abstract：In response to the problem of white bright bands appearing in the Ф310 mm 20 Steel continuous casting billets produced through the LD→LF→CC process,the cause analysis and process optimization were conducted.Through on-site production data statistics,it was found that the appearance of white bright bands was caused by the mismatch among the casting billet drawing speed,superheat,and secondary cooling intensity.When the superheat was high,the drawing speed was fast,and the liquid core was large,the stirring intensity of the CC end on the liquid core was large,and the probability of white bright bands appearing was high;when the superheat was low and the liquid core was small,the stirring intensity of the CC end on the liquid core was small,and the probability of white bright bands appearing was low.By adjusting the CC end stirring parameters from 220 A/7 Hz to 180 A/7 Hz,the white bright bands were basically eliminated.
Keywords：continuous casting round tube blankwhite bandcenter porosityshrink cavitynegative segregation
Publication Date：2025-02-20
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 23-24,28 )