Title (en)

Method of manufacturing micro-alloyed construction steels

Title (de)

Verfahren zur Herstellung von mikrolegierten Baustählen

Title (fr)

Procédé pour la fabrication des aciers de construction micro-alliés

Publication

EP 0947590 A1 19991006 (DE)

Application

EP 99104265 A 19990303

Priority

DE 19814223 A 19980331

Abstract (en)

Microalloyed constructional steels are produced by rolling steels with increased silicon and/or copper, chromium and nickel contents in a compact strip production (CSP) plant. Microalloyed constructional steels are produced by subjecting a continuously cast slab to cutting into lengths, soaking, hot rolling to wide strip in a CSP rolling mill train, cooling and coiling, a yield strength of ≥ 480 MPa and an optimal strength and toughness combination being achieved by carrying out the steps described in patent application number DE 19725434.9-24 and by increasing the silicon content and/or the copper, chromium and nickel contents for controlled solid solution strengthening. An Independent claim is also included for a high strength microalloyed constructional steel produced by the above process. Preferred Features: The steel contains 0.41-0.60% Si, 0.11-0.30% Cu, 0.20-0.60% Cr and 0.10-0.60% Ni.

Abstract (de)

Zur weiteren Festigkeitssteigerung bei der Herstellung von mikrolegierten ferritisch-perlitischen Baustählen in einer CSP-Anlage wird vorgeschlagen, zusätzlich zur thermomechanischen Behandlung mit den Verfahrensschritten der deutschen Patentanmeldung Nr. 19725434.9-24 eine Mischkristallverfestigung durch einen einzelnen oder kombinierten erhöhten Zusatz der Legierungselemente Silicium, Kupfer, Chrom, Nickel herbeizuführen.

IPC 1-7

C21D 8/02; B21B 1/26; B21B 1/46; C22C 38/02

IPC 8 full level

C21D 8/02 (2006.01); C22C 38/02 (2006.01); B21B 1/46 (2006.01)

CPC (source: EP US)

C21D 8/0215 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); B21B 1/466 (2013.01 - EP US)

Citation (search report)

• [A] EP 0368048 A2 19900516 - SCHLOEMANN SIEMAG AG [DE]
• [A] EP 0449004 A2 19911002 - SCHLOEMANN SIEMAG AG [DE]
• [A] EP 0593001 A1 19940420 - SCHLOEMANN SIEMAG AG [DE]
• [A] EP 0266564 A2 19880511 - SCHLOEMANN SIEMAG AG [DE]
• [A] EP 0595282 A1 19940504 - SCHLOEMANN SIEMAG AG [DE]
• [A] EP 0666122 A1 19950809 - SCHLOEMANN SIEMAG AG [DE]
• [A] US 4769088 A 19880906 - ITAMI ATSUSHI [JP], et al
• [A] GB 2099016 A 19821201 - NIPPON KOKAN KK
• [A] EP 0429094 A1 19910529 - KOBE STEEL LTD [JP]
• [A] EP 0535238 A1 19930407 - KAWASAKI STEEL CO [JP]
• [A] US 5622572 A 19970422 - WELLS JR ALFRED H [US], et al

Designated contracting state (EPC)

AT DE ES FR GB IT NL SE

DOCDB simple family (publication)

EP 0947590 A1 19991006; EP 0947590 B1 20081029; AT E412781 T1 20081115; BR 9901027 A 20000125; CA 2267564 A1 19990930; CA 2267564 C 20090707; DE 19814223 A1 19991007; DE 59914885 D1 20081211; ES 2313760 T3 20090301; MX PA99002898 A 20050526; US 6231696 B1 20010515

DOCDB simple family (application)

EP 99104265 A 19990303; AT 99104265 T 19990303; BR 9901027 A 19990325; CA 2267564 A 19990330; DE 19814223 A 19980331; DE 59914885 T 19990303; ES 99104265 T 19990303; MX 9902898 A 19990326; US 27620699 A 19990325