EP 0651059 B1 19990825 - process for producing extra high tensile steel having excellent stress corrosion cracking resistance
Title (en)
process for producing extra high tensile steel having excellent stress corrosion cracking resistance
Title (de)
Verfahren zum Herstellen von hochfestem Stahl mit ausgezeichneter Beständigkeit gegen Spannungsrisskorrosion
Title (fr)
Procédé pour la production d'acier à très haute résistance présentant une excellente résistance à la fissuration par corrosion sous contrainte
Publication
Application
Priority
EP 93117410 A 19931027
Abstract (en)
[origin: EP0651059A1] An extra high tensile steel having an excellent stress corrosion cracking resistance in sea water and a yield strength of 1080 MPa or more is provided. A slab comprising, in terms of % by weight, 0.04 to 0.09% of C, 0.01 to 0.10% of Si, 0.05 to 0.65% of Mn, 8.0 to 11.0% of Ni, 0.5 to 1.5% of Mo, 0.2 to 1.5% of Cr, 0.02 to 0.20% of V and 0.01 to 0.08% of Al with the balance consisting of iron and unavoidable impurities is heated to a temperature between 1000 DEG C and 1250 DEG C, hot-rolled at a temperature of Ar' point or above, air-cooled, reheated at a rate of 120 DEG C/min or less to a temperature region of from (Ac3 point - 40 DEG C) to (Ac3 point + 40 DEG C), quenched and subsequently tempered at a temperature of the Ac1 point or below. <IMAGE>
IPC 1-7
IPC 8 full level
C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/08 (2006.01); C21D 1/18 (2006.01)
CPC (source: EP)
C21D 6/001 (2013.01); C21D 8/0205 (2013.01); C22C 38/08 (2013.01); C21D 1/18 (2013.01); C21D 2211/008 (2013.01)
Designated contracting state (EPC)
DE FR IT SE
DOCDB simple family (publication)
EP 0651059 A1 19950503; EP 0651059 B1 19990825; DE 69326152 D1 19990930; DE 69326152 T2 20000406
DOCDB simple family (application)
EP 93117410 A 19931027; DE 69326152 T 19931027