Process for the production of basic bessemer steel low in nitrogen

Claim 1

A PROCESS OF PRODUCING BASIC BESSEMER STEEL LOW IN NITROGEN, WHICH INCLUDES THE STEPS OF: POURING MOLTEN PIG IRON INTO A BASIC BESSEMER CONVERTER; BLOWING POWDERED LIME INTO THE CONVERTER WITH THE BLAST IN THE FIRST STAGE OF THE BLOWING PROCESS IN APPROXIMATELY THE AMOUNT REQUIRED TO BIND THE COMBUSTION PRODUCTS OF SILICON; CARRYING OUT A DECARBURIZATION STEP AND DURING THE DECARBURIZATION PERIOD CONTINUING BLOWING POWDERED LIME INTO THE BATH AT SUCH REDUCED RATE AS IS REQUIRED TO BIND THE ARISING COMBUSTION PRODUCTS OF A SUBSTANTIAL PORTION OF THE PHOSPHORUS CONTAINED IN THE PIG IRON; COMPLETING THE DEPHOSPHORIZATION OF THE IRON BY AGAIN INCREASING THE SUPPLY OF POWDERED LIME TO THE BLAST TO APPROXIMATELY THE AMOUNT REQUIRED TO BIND THE FURTHER ARISING COMBUSTION PRODUCTS OF THE PHOSPHOROUS; AND CONTROLLING THE TEMPERATURE OF THE BATH BY INTRODUCING A SOLID COOLING AGENT INTO THE BATH.