EP 0098564 B1 19860409 - PROCESS FOR PRODUCING FINE-GRAINED, WELDABLE PLATES FOR LARGE PIPES
Title (en)
PROCESS FOR PRODUCING FINE-GRAINED, WELDABLE PLATES FOR LARGE PIPES
Publication
Application
Priority
DE 3226160 A 19820709
Abstract (en)
[origin: US4494999A] Microalloyed steel containing, among other ingredients, at least 0.02% niobium, between 0.005 and 0.01% nitrogen, and titanium in a proportion equaling about 3.5 to 4 times that of nitrogen is continuously cast into a slab which is heated to a temperature between about 1120 DEG and 1160 DEG C. whereby titanium nitride precipitates in particles ranging between about 0.06 and 0.2 mu . The slab is thermomechanically treated at this temperature and after intermediate cooling in several hot-rolling stages, with an initial deformation of at least 55%; after final rolling, the slab is cooled in water at a rate of at least 10 DEG C. per second to a temperature of about 500 DEG to 550 DEG C. Niobium, which goes into solution at the elevated initial temperature, forms NbC precipitates during the subsequent treatment; this has a hardening and grain-refining effect.
IPC 1-7
IPC 8 full level
B21B 3/00 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01)
CPC (source: EP US)
C21D 8/0226 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C21D 8/021 (2013.01 - EP US); C21D 8/0231 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0098564 A1 19840118; EP 0098564 B1 19860409; AT E19099 T1 19860415; AU 1618983 A 19840112; AU 1663283 A 19840112; AU 551994 B2 19860515; CA 1211343 A 19860916; CS 330783 A2 19840618; CZ 278612 B6 19940413; CZ 515783 A3 19940119; JP H0647695 B2 19940622; JP S5913023 A 19840123; JP S5967315 A 19840417; MX 159207 A 19890502; NO 161507 B 19890516; NO 161507 C 19890823; NO 832485 L 19840110; SK 277820 B6 19950308; SK 515783 A3 19950308; US 4494999 A 19850122
DOCDB simple family (application)
EP 83106483 A 19830702; AT 83106483 T 19830702; AU 1618983 A 19830623; AU 1663283 A 19830707; CA 432128 A 19830708; CS 330783 A 19830511; CS 515783 A 19830707; JP 12352483 A 19830708; JP 9056983 A 19830523; MX 19797983 A 19830708; NO 832485 A 19830707; SK 515783 A 19830707; US 51245083 A 19830711