Production method of hot rolled steel coil for ship building

• Main Authors: CAO TAIPING, ZHAO YANLING, YANG YUNQING, LIU LINGYUE, QIU XIANGGUANG, ZHANG QINGYU, ZHOU YANJUAN, LIU WANSHAN
• Format: Patent
• Language: Chinese; English
• Published: 20.07.2011
• Subjects: ALLOYS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a production method of a hot rolled steel coil for ship building, comprising the following steps of: (1) designing components, preprocessing molten iron, then smelting in a converter, switching between nitrogen and argon, and tapping to obtain molten steel; (2) continuously casting the molten steel to obtain a plate blank, wherein the molten steel quantity of a tundish when the continuous casting tundish is stopped to be poured is controlled at 8-15t, and the liquid level is controlled at 200-350 mm; protecting the pouring in the whole process, wherein the inserting depth of a long water gap is 300-400 mm; (3) heating the plate blank; and (4) finally, rolling the heated plate blank and curling to obtain the hot rolled steel coil for ship building. The contents of C and Mn are reduced greatly by adopting a TMCP (Thermo Mechanical Control Process) and an RPC (Remote Position Control) rolling process and utilizing niobium microalloying, and the production cost is lowered; an E36-grade ho