The  transverse  cracks  with  length  10～30  mm  and  maximum  wide  2  mm  at billet  corner  vibrating  mark trough of pickled 300 mm×320 mm low carbon steel cast bloom produced at Xingcheng special  Steel were observed. The  production   practice   indicated   that   as   [Al

]   of   SA-210   series   steel   for   boiler(0.13～0.25C

0.45～1. 10Mn)increased  from  0.009% to  0.021% the  index  of transverse  crack  at  corner  of casting bloom  increased  from  0.03 to 2.64

while with  adding micro titanium in steel the transverse crack at corner of casting bloom decreased obviously as micro titanium is avail able to improve hot forming ability of steel at lower deformation rate. The formation of transverse crack at corner of casting  bloom  of  SA-210C  steel  was  avoided  by  control  adding  Al  amount  to  ensure  [Al

]≤0.010%

adding  Ti  to  get  about  0.02%[Ti]

and  adopting  the  operation  measures  such  as  to  increase  molten  steel  flowability  and  cast  bloom  straightening  temperature  ≥900℃.