METHOD FOR MANUFACTURING AUSTENITIC STAINLESS STEEL SHEET WITH EXCELLENT SURFACE PROPERTY

• Main Authors: FURUSAWA HIDEYA, MIKAWA YUICHI, KAKIHARA SETSUO
• Format: Patent
• Language: English
• Published: 21.05.2003
• Edition: 7
• 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

PROBLEM TO BE SOLVED: To prevent the occurrence of scab due to hot cracking in a cold rolled sheet even if Sn content in raw materials in increased by increase of the mixed amount of scrap iron. SOLUTION: When extracting a steel stock containing <=0.20 mass% Sn as a tramp element and used for austenitic stainless steel sheet from a heating furnace, extraction temperature is regulated, according to the Sn content in the steel stock, to a value not higher than the upper limit value (TLSn ) represented by the following equation: TLSn =2083×[Sn] -812.5×[Sn]+1295( deg.C) (wherein, TLSn is the upper limit value of the extraction temperature of the Sn-containing steel stock from the heating furnace, ( deg.C); and [Sn] is the Sn content in the steel, (mass%)).