EP 0172544 A3 19871028 - PROCESS FOR MANUFACTURING ROLLED STEEL PRODUCTS, IN PARTICULAR HELICALLY RIBBED PRESTRESSED STEEL RODS
Title (en)
PROCESS FOR MANUFACTURING ROLLED STEEL PRODUCTS, IN PARTICULAR HELICALLY RIBBED PRESTRESSED STEEL RODS
Publication
Application
Priority
DE 3431008 A 19840823
Abstract (en)
[origin: ES8609490A1] To produce threaded steel tension members, steel is used with a C-content of 0.50 to 0.80%, preferably 0.75%, a Si-content of 0.20 to 0.50%, preferably 0.25%, and a Mn content of 0.30 to 0.80%, preferably 0.60%. Exiting from the rolling heat at the outlet side of the finishing stand after hot rolling, the tension member or rod is subjected to surface quenching by a cooling medium, preferably water, so that the steel in a rim zone R1 is transformed immediately and completely into martensite, while the heat content remaining in the core zone K1 does not effect a tempering of the martensite rim zone during the subsequent cooling beyond the range of the intermediate stage. Steel tension members of this type have a high ductility and toughness at a high yield limit and high strength, they are corrosion-resistant to a great degree and have a wear resistant surface which makes them particularly suitable for threaded tension rods in which the threads are produced either by a cold forming operation or hot rolled ribs.
IPC 1-7
IPC 8 full level
B21B 1/16 (2006.01); C21D 1/19 (2006.01); C21D 8/08 (2006.01); C21D 9/00 (2006.01); C21D 9/52 (2006.01); E04C 5/03 (2006.01); E04C 5/16 (2006.01)
CPC (source: EP US)
C21D 1/19 (2013.01 - EP US); C21D 8/08 (2013.01 - EP US); Y10S 148/902 (2013.01 - EP US); Y10S 148/907 (2013.01 - EP US)
Citation (search report)
- [Y] DE 2163163 B2 19721130
- [Y] DE 2439784 A1 19750403 - QUALITAETS UND EDELSTAHL KOM V
- [A] BE 874535 A 19790618 - CENTRE RECH METALLURGIQUE
- [A] DE 1913758 A1 19691009 - UNITED STATES STEEL CORP
- [AD] CH 364886 A 19621015 - DYCKERHOFF & WIDMANN AG [DE]
- [A] DE 3131078 C1 19821028 - DYCKERHOFF & WIDMANN AG
- [A] IRON AND STEEL ENGINEER, Band 61, Nr. 3, März 1984, Seiten 53-57, Pittsburgh, Pennsylvania, US; P. SIMON et al.: "Tempcore: a new process for the production of high-quality reinforcing bars"
Designated contracting state (EPC)
AT BE DE FR GB IT LU
DOCDB simple family (publication)
EP 0172544 A2 19860226; EP 0172544 A3 19871028; EP 0172544 B1 19900124; EP 0172544 B2 19960605; AT E49779 T1 19900215; AU 4658285 A 19860227; AU 565805 B2 19871001; BR 8504032 A 19860610; CA 1268957 A 19900515; DE 3431008 A1 19860306; DE 3431008 C2 19861016; DE 3575577 D1 19900301; ES 546332 A0 19860716; ES 8609490 A1 19860716; JP H0660350 B2 19940810; JP S6160824 A 19860328; US 4877463 A 19891031; ZA 856448 B 19860430
DOCDB simple family (application)
EP 85110316 A 19850817; AT 85110316 T 19850817; AU 4658285 A 19850823; BR 8504032 A 19850822; CA 489259 A 19850822; DE 3431008 A 19840823; DE 3575577 T 19850817; ES 546332 A 19850822; JP 18434085 A 19850823; US 20555688 A 19880607; ZA 856448 A 19850823