Abstract
Investigation was made on some blowing conditions of L-D converter that might finish dephosphorization earlier than decarborization, using an experimental baby converter.
The conclusions obtained were as follows.
(1) The degree of preferential dephosphorization was expressed in terms of the maximum value of ΔP/ΔC, where ΔP is% of dephosphorization and ΔC is% of decarbonization. This degree was increased in parallel with a decrease of the time required for slag formation, an increase of agitation and an decrease of bath temperature.
(2) The phosphorus content at the end of blowing was decreased against an increase of (ΔP/ΔC) max.
(3) The time required for reaching the maximum value of ΔP/ΔC became the longer against a delay of slag fomation, a decrease of agitation and a decrease of the bath temperature.
(4) The blowing time became the shorter against a decrease of the time required for the ΔP/ΔC reaching maximum.
(5) If the (ΔP/ΔC) max was maintained constant, the time reqnird for the ΔP/ΔC reaching maximum was reduced with an increase of agitation and a decrease of nozzle diameter because of high temperature blowing.
