1985 Volume 71 Issue 2 Pages 266-273
In order to develope the production method of enameling steel sheet by continuous casting, it is necessary to prevent fishscaling of killed steel. The effect of B and N in steel on fishscaling and hydrogen permeation of Al killed steel sheet has been studied using the specimens prepared from vacuum melting.
Fishscaling was reduced appreciably by adding B into steel, and remarkably by adding B and N. As B. and N contents increased, hydrogen permeation and fishscale susceptibility reduced. As a close correlation existed between the fishscale susceptibility and insoluble B (B as BN) in steel, it was considered that the reducing effect by B and N addition was due to boron nitride depositing in steel. In order to prevent fishscale perfectly, it was necessary to contain insoluble B more than 0.002% for cold rolled steel sheet and 0.008% for hot rolled steel sheet, respectively.