However , they were still behind schedule and , though they commenced steel production in 1959-60 , their operations had not stabilised till 1962 . यद्यपि सन् 1959-60 में इन्होंने इस्पात-निर्माण कार्य शुरू कर दिया , इनके संचालन में सन् 1962 तक भी स्थिरता नहीं आयी .