In recent days, Pangang successfully test-produced 8 furnaces of L360QCS ultra-ultra-low sulfur billet steel on No. 2 square billet, with a yield rate reaching 100%. L360QCS steel is mainly used to prepare high-grade seamless oil casing, and the content of harmful element S in the steel is required to be very low. How to reduce and stably control the S content in the molten steel is the technical bottleneck of producing L360QCS ultra-low sulfur billet steel. In response to this...