The reason of oxide scale of continuous casting slab in 22SiMn2TiB steel cannot be completely removed was analyzed by SEM

EDX and XRD. The results show that silicon element (0.70% 〜1. 00 %) of 22SiMn2TiB steel is easy oxidation

and form the phase of Fe

2

SiO

4

(fayalite ) under the condition of primary heating process. The form of Fe

2

SiO

4

(fayalite) will be changed after high-pressure water descaling

like anchor

FeO will be packed by it

leading to the increment of adhesion force between inner layer oxide scale and steel matrix

which is the reason for the incompletely removed of oxide scale of continuous casting slab. According to the analysis results

we have optimized heating process of continuous casting slab

the temperature of continuous casting slab was elevated 1 250 ~ 1 300℃

thus

the temperature of continuous casting slab was controlled above 1 173 ℃ after high-pressure water descaling

leading to the decrease of adhesion force between inner layer oxide scale and steel matrix

the question of incompletely descaling of continuous casting slab in steel 22SiMn2TiB will be effectively resolved.