EP 0123406 A2 19841031 - Low alloy steel plate and process for production thereof.
Title (en)
Low alloy steel plate and process for production thereof.
Title (de)
Niedriglegierte Stahlplatte und Herstellungsverfahren.
Title (fr)
Plaque en acier faiblement allié et procédé de production.
Publication
Application
Priority
US 47635383 A 19830317
Abstract (en)
Low alloy steel shape of at least 4.8 mm thickness is produced by providing a steel consisting essentially of from about 0.02% to 0.07% carbon, 1.2% to 2.0% manganese, 0.020% maximum sulfur, up to 0.5% silicon, 0.1% to 0.4% molybdenum, 0.01% to 0.1% columbium, about 0.01% to 0.10% acid soluble aluminum, about 0.8% to 2.0% copper, about 0.4% to 2.0% nickel, residual chromium, and balance iron; hot reducing the steel to a desired final thickness with a total reduction in thickness of at least 30% while within the temperature range of about 760 DEG to 927 DEG C whereby to avoid substantial recrystallization of austenite and to obtain a predominant heavily deformed austenite phase; and cooling at a rate which transforms the austenite phase to a predominantly fine acicular ferrite and lower-bainite phase. The steel may also be precipitation hardened, or may be hot reduced either by the above-described controlled hot reduction or by conventional hot reduction, austenitized, quenched, and precipitation hardened. The product has high strength, improved low temperature toughness and excellent weldability.
IPC 1-7
IPC 8 full level
C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (2006.01); C21D 6/02 (2006.01)
CPC (source: EP KR)
C21D 1/00 (2013.01 - KR); C21D 8/0226 (2013.01 - EP); C22C 38/08 (2013.01 - EP); C22C 38/16 (2013.01 - EP); C21D 6/02 (2013.01 - EP); C21D 2211/002 (2013.01 - EP); C21D 2211/005 (2013.01 - EP)
Designated contracting state (EPC)
AT BE DE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0123406 A2 19841031; EP 0123406 A3 19871007; BR 8401222 A 19841023; CA 1207639 A 19860715; ES 530726 A0 19850301; ES 8503725 A1 19850301; JP S605822 A 19850112; KR 840007899 A 19841211
DOCDB simple family (application)
EP 84301762 A 19840315; BR 8401222 A 19840316; CA 449354 A 19840312; ES 530726 A 19840316; JP 5082284 A 19840316; KR 840001338 A 19840316