Patent ID: 6358299
Filing Date: 2002-03-19
Classification: C21C,Y02P

Abstract:
A vacuum oxygen decarbonization (VOD) refining method for producing stainless steel containing sulphur, comprising the steps of:a) refining stainless steel containing carbon using a vacuum oxygen decarbonization process to remove carbon from the stainless steel; b) adding elements to the stainless steel to form a steel phase and a steel residue phase, the elements including at least chromium and manganese and excluding CaF2 and Al; c) adding ferrous sulphide to the stainless steel; d) adding between 0.001 wt %-0.01 wt % of CaO and between 0.001 wt %-0.005 wt % of MgO to the stainless steel to elevate sulphur absorption in the stainless steel whereby an aggregate sulphur recycling percentage is greater than 85%; and, e) separating the steel phase from the steel residue phase.