EP 1788105 A1 20070523 - Spring steel wire rod excellent in pickling performance
Title (en)
Spring steel wire rod excellent in pickling performance
Title (de)
Federstahldraht mit Leistung der Beizen
Title (fr)
Fil d'acier ressort avec performance de décapage
Publication
Application
Priority
JP 2005334845 A 20051118
Abstract (en)
A spring steel wire rod according to the present invention is a spring steel wire rod wherein: the spring steel wire rod contains C: 0.35% to 0.7% (by mass, the same is hereunder applied), Si: 1.5% to 2.50%, Mn: 0.05% to 1.0%, Cr: 0.05% to 1.9%, Cu: 0.05% to 0.7%, Ni: 0.15% to 0.8%, P: 0.02% or less (excluding 0%), S: 0.02% or less (excluding 0%); and the balance being Fe and unavoidable impurities, wherein the ratio of Si to Cu (Si/Cu) is in the range of 4 or more; and the difference between the concentration of Cu in the surface layer and the concentration of Cu in the steel is 0.50% or less and the difference between the concentration of Ni in the surface layer and the concentration of Ni in the steel is 1.00% or less. The present invention makes it possible to improve pickling performance in a spring steel wire rod containing Si abundantly and further Cr, Cu, and Ni.
IPC 8 full level
C22C 38/34 (2006.01)
CPC (source: EP KR US)
C21D 8/065 (2013.01 - EP KR US); C21D 9/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/34 (2013.01 - EP KR US); C22C 38/42 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP KR US); C22C 38/50 (2013.01 - EP KR US)
Citation (search report)
- [X] US 5846344 A 19981208 - KAWAGUCHI YASUNOBU [JP], et al
- [X] US 5951944 A 19990914 - MOTOMURA HIROHARU [JP], et al
- [A] US 6322641 B1 20011127 - MAKII KOICHI [JP], et al
- [A] JP H08295993 A 19961112 - NIPPON STEEL CORP
- [A] JP H108203 A 19980113 - NIPPON STEEL CORP
- [A] US 2004129354 A1 20040708 - NAGAO MAMORU [JP], et al
- [A] EP 0713924 A2 19960529 - DAIDO STEEL CO LTD [JP]
- [A] JP S61170542 A 19860801 - DAIDO STEEL CO LTD
- [X] C. WEGST, M. WEGST: "STAHLSCHLÜSSEL", 2004, VERLAG STAHLSCHLÜSSEL WEGST GMBH, DÜSSELDORF, XP002415353
- [X] LIKHOV V K ET AL: "Assimiliation of production of wire rod for manufacture of safety critical springs", STEEL IN THE USSR, METALS SOCIETY, LONDON, GB, vol. 18, no. 2, February 1988 (1988-02-01), pages 81 - 83, XP002133957, ISSN: 0038-9218
Designated contracting state (EPC)
BE DE FR NL
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
EP 1788105 A1 20070523; EP 1788105 B1 20120808; CN 100462470 C 20090218; CN 1982494 A 20070620; JP 2007138259 A 20070607; JP 4369415 B2 20091118; KR 100891764 B1 20090407; KR 20070053124 A 20070523; KR 20080085802 A 20080924; US 2007125455 A1 20070607
DOCDB simple family (application)
EP 06021771 A 20061017; CN 200610148580 A 20061116; JP 2005334845 A 20051118; KR 20060113228 A 20061116; KR 20080084479 A 20080828; US 54808006 A 20061010