EP 0123406 A3 19871007 - LOW ALLOY STEEL PLATE AND PROCESS FOR PRODUCTION THEREOF
Title (en)
LOW ALLOY STEEL PLATE AND PROCESS FOR PRODUCTION THEREOF
Publication
Application
Priority
US 47635383 A 19830317
Abstract (en)
[origin: EP0123406A2] 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
C22C 38/00 (2006.01); C21D 8/02 (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)
Citation (search report)
- [YD] GB 1436846 A 19760526 - INT NICKEL LTD
- [Y] US 4184898 A 19800122 - MATSUMOTO KAZUAKI [JP], et al
- [A] GB 1338285 A 19731121 - NIPPON KOKAN KK
- [A] US 3539404 A 19701110 - DERETANA ANTHONY F
- [A] US 3726723 A 19730410 - COLDREN A, et al
- [AD] US 3955971 A 19760511 - REISDORF BARTHOLOMEW G
- [AD] US 4008103 A 19770215 - MIYOSHI EIJI, et al
- [AD] CA 988751 A 19760511 - KRISHNADEV MADHAVARAO
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