EP 0305914 A3 19890809 - PROCESS FOR THE TREATMENT OF ROLLED STEEL FOR INCREASING CORROSION RESISTANCE
Title (en)
PROCESS FOR THE TREATMENT OF ROLLED STEEL FOR INCREASING CORROSION RESISTANCE
Publication
Application
Priority
DE 3729177 A 19870901
Abstract (en)
[origin: EP0305914A2] To apply a coating of a non-ferrous metal such as, for example, zinc to the surface of rolled steel to increase the corrosion resistance, it is proposed to descale the rolled steel continuously downstream of the rolling step from the rolling pass by applying pressurised water and, immediately after descaling and while preventing a renewed formation of scale, to cool it by means of water rapidly to a temperature suitable for hot application of the coating and finally to apply the coating. One of the advantages of the invention is that, both for descaling and for preventing the renewed formation of scale and for simultaneous cooling, only a single medium, namely water, is used, and the cooling can be controlled in such a way that the rolling pass can be exploited in an optimised manner for the coating. The result is that all process steps or treatment processes can proceed as a continuous extension of the rolling step, i.e. at rolling speed, so that the finished coated end product leaves the production line analogously to a normal, not aftertreated rolled product.
IPC 1-7
IPC 8 full level
C23F 15/00 (2006.01); B21B 45/02 (2006.01); B21B 45/08 (2006.01); B21C 43/04 (2006.01); C21D 8/08 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C23C 2/38 (2006.01); C23C 4/02 (2006.01); C23C 4/06 (2006.01); C23C 28/00 (2006.01); C23F 13/00 (2006.01); B21B 1/38 (2006.01)
CPC (source: EP US)
B21B 45/08 (2013.01 - EP); C21D 8/08 (2013.01 - EP); C23C 2/02 (2013.01 - EP US); C23C 2/024 (2022.08 - EP US); C23C 4/02 (2013.01 - EP); B21B 2001/383 (2013.01 - EP)
Citation (search report)
- DE 3125146 A1 19830113 - WOMA MAASBERG CO GMBH W [DE]
- US 2442485 A 19480601 - COOK FREDERICK C
- DE 1602129 B1 19700827 - ROECHLINGSCHE EISEN & STAHL
- DE 2108314 A1 19720210
- PATENT ABSTRACTS OF JAPAN, Unexamined Applications, C Field, Band 6, Nr. 57, 14. April 1982 The Patent Office Japanese Government seite 57 C 98 * Kokai-Nr. 56-169 781 (Sumitomo Kinzoku Kogyo K.K.) *
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0305914 A2 19890308; EP 0305914 A3 19890809; EP 0305914 B1 19911218; AT E70568 T1 19920115; CA 1306391 C 19920818; CN 1031724 A 19890315; DD 282246 A5 19900905; DE 3729177 C1 19890105; DE 3866998 D1 19920130; DK 460688 A 19890302; DK 460688 D0 19880817; ES 2028964 T3 19920716; GR 3004067 T3 19930331; HU 203586 B 19910828; HU T52178 A 19900628; JP H0445591 B2 19920727; JP S6475692 A 19890322; NO 176578 B 19950116; NO 176578 C 19950426; NO 883781 D0 19880824; NO 883781 L 19890302; PL 158408 B1 19920831; PL 274389 A1 19890417; PT 88371 A 19890731; PT 88371 B 19930226; SU 1674689 A3 19910830
DOCDB simple family (application)
EP 88113916 A 19880826; AT 88113916 T 19880826; CA 576161 A 19880831; CN 88106460 A 19880831; DD 31928188 A 19880829; DE 3729177 A 19870901; DE 3866998 T 19880826; DK 460688 A 19880817; ES 88113916 T 19880826; GR 920400458 T 19920318; HU 439788 A 19880818; JP 21535788 A 19880831; NO 883781 A 19880824; PL 27438988 A 19880825; PT 8837188 A 19880830; SU 4356320 A 19880826