Compare with the three-step method

through the study of smelting and continuous casting of High-Nitrogen stainless steel 10Cr21 Mnl6NiN

the two-step smelting and continuous casting technology has been optimized

the adding nitrogen rate is raised from 5 x 10

-6

~ 10 x 10

-6

/min to 20 x 10

-6

~ 30 x 10

-6

/min in later stages of LF

the LF refining time is shortened from 390 min to 240 min

the CCM steel waiting time is reduced from 4 h to 2 h ； it solves the problem of slag spilling during the nitrogen adding；it also avoids the billet buckling during continuous casting

the breakage rate of No. 1

&

No. 2 casting strand reduces from 100% to O

the equipment accident rate decreases from 66. 7% to 0

to achieve 100% 2- heats sequence casting. The practice shows that the billet casting without closely spaced rolls can produced Hig

h-Nitrogen stainless steel even though with only one five-high withdrawing and straightening machine.