LINE-PIPE STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a line-pipe steel sheet with excellent fracture propagation resistance and high uniform elongation ratio and a method for manufacturing the same. The line-pipe steel sheet includes 0.08-0.10 wt% of carbon (C), 0.05-0.50 wt% of silicon (Si), 1.4-2.0 wt% of manganese (...

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Hauptverfasser:	KIM, KANG SEOK, KANG, SANG DEOK, NOH, HEE GOON, CHON, SEUNG HWAN
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	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 METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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creator	KIM, KANG SEOK KANG, SANG DEOK NOH, HEE GOON CHON, SEUNG HWAN
description	The present invention relates to a line-pipe steel sheet with excellent fracture propagation resistance and high uniform elongation ratio and a method for manufacturing the same. The line-pipe steel sheet includes 0.08-0.10 wt% of carbon (C), 0.05-0.50 wt% of silicon (Si), 1.4-2.0 wt% of manganese (Mn), 0.01-0.05 wt% of aluminum (Al), 0.005-0.02 wt% of titanium (Ti), 0.002-0.01 wt% of nitrogen (N), 0.02-0.07 wt% of niobium (Nb), 0.05-0.08 wt% of vanadium (V), 0.1-0.4 wt% of nickel (Ni), less than 0.015 wt% of phosphorus (P), less than 0.005 wt% of sulfur (S), 0.0005-0.004 wt% of calcium (Ca), the remainder consisting of iron (Fe) and inevitable impurities. The microstructure of the steel sheet includes 65-80% of air-cooled ferrite and 20-35% of pearlite in an area fraction. According to the present invention, provided is the steel sheet of a line pipe capable of ensuring a DWTT of shear fracture area percent of more than 90% under a guaranteed temperature of -20°C and having a uniform elongation ratio of more than 10% at the same time, and having a yield strength of 70 ksi.
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The line-pipe steel sheet includes 0.08-0.10 wt% of carbon (C), 0.05-0.50 wt% of silicon (Si), 1.4-2.0 wt% of manganese (Mn), 0.01-0.05 wt% of aluminum (Al), 0.005-0.02 wt% of titanium (Ti), 0.002-0.01 wt% of nitrogen (N), 0.02-0.07 wt% of niobium (Nb), 0.05-0.08 wt% of vanadium (V), 0.1-0.4 wt% of nickel (Ni), less than 0.015 wt% of phosphorus (P), less than 0.005 wt% of sulfur (S), 0.0005-0.004 wt% of calcium (Ca), the remainder consisting of iron (Fe) and inevitable impurities. The microstructure of the steel sheet includes 65-80% of air-cooled ferrite and 20-35% of pearlite in an area fraction. According to the present invention, provided is the steel sheet of a line pipe capable of ensuring a DWTT of shear fracture area percent of more than 90% under a guaranteed temperature of -20°C and having a uniform elongation ratio of more than 10% at the same time, and having a yield strength of 70 ksi.</description><language>eng ; kor</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 ; METALLURGY ; METALLURGY OF IRON ; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS ; TREATMENT OF ALLOYS OR NON-FERROUS METALS</subject><creationdate>2014</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=20140707&DB=EPODOC&CC=KR&NR=20140084891A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20140707&DB=EPODOC&CC=KR&NR=20140084891A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>KIM, KANG SEOK</creatorcontrib><creatorcontrib>KANG, SANG DEOK</creatorcontrib><creatorcontrib>NOH, HEE GOON</creatorcontrib><creatorcontrib>CHON, SEUNG HWAN</creatorcontrib><title>LINE-PIPE STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME</title><description>The present invention relates to a line-pipe steel sheet with excellent fracture propagation resistance and high uniform elongation ratio and a method for manufacturing the same. 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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 METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
title	LINE-PIPE STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
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