The invention relates to a method for surface
quenching treatment of a 10B21
casting blank and the compact-surface 10B21
casting blank obtained by the same. The method comprises the following steps that a 10B21
casting blank is provided; the casting blank is subjected to surface
quenching, and a quenched casting blank is obtained;
tempering is conducted through the core part
waste heat of the quenched casting blank, and the 10B21 casting blank with the compact surface is obtained; the
quenching time is 40-100s, the initial temperature is 808-857 DEG C, the final temperature is 211-667 DEG C, the through quenching depth is 8-10mm, and the
tempering highest point temperature is 535-695 DEG C; and in the
depth direction from the surface of the casting blank to a core part, the organization structure of the 10B21 casting blank with the compact surface is gradually converted from tempered sorbite as the main part to
bainite as the main part, and then is gradually converted into ferrite and
pearlite as the main part. According to the method, effective control over the
surface structure type of the 10B21 casting blank is achieved through the surface quenching technology, and therefore, generation of surface cracks in the casting blank hot delivery process is effectively restrained.