HIGHLY FORMABLE STEEL SHEET AND PRODUCTION METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet and a cold rolled steel sheet which have excellent ductility and suitability for deep drawing, and are suitable for automobile and house appliance uses and to provide a production method therefor. SOLUTION: The highly formable hot rolled stee...
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| creator | NAGAMICHI TOKIAKI |
| description | PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet and a cold rolled steel sheet which have excellent ductility and suitability for deep drawing, and are suitable for automobile and house appliance uses and to provide a production method therefor. SOLUTION: The highly formable hot rolled steel sheet consists of low carbon steel containing C of 1 to 20 μm, the area ratio of the equiaxial ferritic phase is >=90%, and, in >=70% of the ferritic boundaries, the orientation difference between the adjacent crystal grains is >=15 deg.C. Also the average grain size of a second phase which has the maximum area ratio in the balance phase is |
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SOLUTION: The highly formable hot rolled steel sheet consists of low carbon steel containing C of <=0.05%. The steel sheet has a structure in which the average grain size of an equiaxial ferritic phase is >1 to 20 μm, the area ratio of the equiaxial ferritic phase is >=90%, and, in >=70% of the ferritic boundaries, the orientation difference between the adjacent crystal grains is >=15 deg.C. Also the average grain size of a second phase which has the maximum area ratio in the balance phase is <=20 μm, and the total area ratio of the balance phase is <=10%. The steel is produced by transforming the austenitic phase of a slab consisting of the low carbon steel containing <=0.05% C into a ferritic phase in the process of rough rolling or after rough rolling, then again transforming the ferritic phase into an austenitic phase by heating until the start of finish rolling, and thereafter subjecting the steel to finish rolling so that the total draft in the temperature range of (the Ar3 point - 50 deg.C) to (the Ar3 point + 100 deg.C) is >=5%.</description><edition>7</edition><language>eng</language><subject>ALLOYS ; CHEMISTRY ; FERROUS OR NON-FERROUS ALLOYS ; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS ; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS ; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL ; METALLURGY ; METALLURGY OF IRON ; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS ; PERFORMING OPERATIONS ; PUNCHING METAL ; ROLLING OF METAL ; TRANSPORTING ; TREATMENT OF ALLOYS OR NON-FERROUS METALS</subject><creationdate>2002</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20020911&DB=EPODOC&CC=JP&NR=2002256390A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20020911&DB=EPODOC&CC=JP&NR=2002256390A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>NAGAMICHI TOKIAKI</creatorcontrib><title>HIGHLY FORMABLE STEEL SHEET AND PRODUCTION METHOD THEREFOR</title><description>PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet and a cold rolled steel sheet which have excellent ductility and suitability for deep drawing, and are suitable for automobile and house appliance uses and to provide a production method therefor. SOLUTION: The highly formable hot rolled steel sheet consists of low carbon steel containing C of <=0.05%. The steel sheet has a structure in which the average grain size of an equiaxial ferritic phase is >1 to 20 μm, the area ratio of the equiaxial ferritic phase is >=90%, and, in >=70% of the ferritic boundaries, the orientation difference between the adjacent crystal grains is >=15 deg.C. Also the average grain size of a second phase which has the maximum area ratio in the balance phase is <=20 μm, and the total area ratio of the balance phase is <=10%. The steel is produced by transforming the austenitic phase of a slab consisting of the low carbon steel containing <=0.05% C into a ferritic phase in the process of rough rolling or after rough rolling, then again transforming the ferritic phase into an austenitic phase by heating until the start of finish rolling, and thereafter subjecting the steel to finish rolling so that the total draft in the temperature range of (the Ar3 point - 50 deg.C) to (the Ar3 point + 100 deg.C) is >=5%.</description><subject>ALLOYS</subject><subject>CHEMISTRY</subject><subject>FERROUS OR NON-FERROUS ALLOYS</subject><subject>GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS</subject><subject>MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS</subject><subject>MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL</subject><subject>METALLURGY</subject><subject>METALLURGY OF IRON</subject><subject>MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS</subject><subject>PERFORMING OPERATIONS</subject><subject>PUNCHING METAL</subject><subject>ROLLING OF METAL</subject><subject>TRANSPORTING</subject><subject>TREATMENT OF ALLOYS OR NON-FERROUS METALS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2002</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZLDy8HT38IlUcPMP8nV08nFVCA5xdfVRCPZwdQ1RcPRzUQgI8ncJdQ7x9PdT8HUN8fB3UQjxcA1yBarnYWBNS8wpTuWF0twMSm6uIc4euqkF-fGpxQWJyal5qSXxXgFGBgZGRqZmxpYGjsZEKQIAAA4pbA</recordid><startdate>20020911</startdate><enddate>20020911</enddate><creator>NAGAMICHI TOKIAKI</creator><scope>EVB</scope></search><sort><creationdate>20020911</creationdate><title>HIGHLY FORMABLE STEEL SHEET AND PRODUCTION METHOD THEREFOR</title><author>NAGAMICHI TOKIAKI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2002256390A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2002</creationdate><topic>ALLOYS</topic><topic>CHEMISTRY</topic><topic>FERROUS OR NON-FERROUS ALLOYS</topic><topic>GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS</topic><topic>MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS</topic><topic>MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL</topic><topic>METALLURGY</topic><topic>METALLURGY OF IRON</topic><topic>MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS</topic><topic>PERFORMING OPERATIONS</topic><topic>PUNCHING METAL</topic><topic>ROLLING OF METAL</topic><topic>TRANSPORTING</topic><topic>TREATMENT OF ALLOYS OR NON-FERROUS METALS</topic><toplevel>online_resources</toplevel><creatorcontrib>NAGAMICHI TOKIAKI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>NAGAMICHI TOKIAKI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>HIGHLY FORMABLE STEEL SHEET AND PRODUCTION METHOD THEREFOR</title><date>2002-09-11</date><risdate>2002</risdate><abstract>PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet and a cold rolled steel sheet which have excellent ductility and suitability for deep drawing, and are suitable for automobile and house appliance uses and to provide a production method therefor. SOLUTION: The highly formable hot rolled steel sheet consists of low carbon steel containing C of <=0.05%. The steel sheet has a structure in which the average grain size of an equiaxial ferritic phase is >1 to 20 μm, the area ratio of the equiaxial ferritic phase is >=90%, and, in >=70% of the ferritic boundaries, the orientation difference between the adjacent crystal grains is >=15 deg.C. Also the average grain size of a second phase which has the maximum area ratio in the balance phase is <=20 μm, and the total area ratio of the balance phase is <=10%. The steel is produced by transforming the austenitic phase of a slab consisting of the low carbon steel containing <=0.05% C into a ferritic phase in the process of rough rolling or after rough rolling, then again transforming the ferritic phase into an austenitic phase by heating until the start of finish rolling, and thereafter subjecting the steel to finish rolling so that the total draft in the temperature range of (the Ar3 point - 50 deg.C) to (the Ar3 point + 100 deg.C) is >=5%.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | HIGHLY FORMABLE STEEL SHEET AND PRODUCTION METHOD THEREFOR |
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