EP 0626467 A4 19950301 - METHOD OF CONTINUOUSLY CARBURIZING METAL STRIP.

Title (en)

METHOD OF CONTINUOUSLY CARBURIZING METAL STRIP.

Title (de)

VERFAHREN ZUR KONTINUIERLICHEN AUFKOHLUNG EINES METALLBANDES.

Title (fr)

PROCEDE PERMETTANT DE CEMENTER EN CONTINU UN FEUILLARD.

Publication

EP 0626467 A4 19950301 (EN)

Application

EP 93922640 A 19931015

Priority

JP 27730592 A 19921015
JP 28752392 A 19921026
JP 28752492 A 19921026
JP 34447292 A 19921224
JP 9301486 W 19931015

Abstract (en)

[origin: WO9409175A1] This invention aims at providing a method of continuously carburizing a metal strip, which is capable of providing industrially optimum carburization conditions while attaining non-soot-generating atmospheric data, desired carburization concentration distribution and desired carburization rate, in a case where a strip passed through a carburization furnace is carburized continuously in a surface reaction rate-determining region in which the carbon concentration in a superficial layer of the strip has not yet reached an equilibrium level with respect to the time. The method consist of carburization concentration distribution (S7), on the basis of the carburization conditions including given specification data for the steel plate, furnace temperature and composition of the atmospheric gas, outputting the concentration of the components of the atmospheric gas, feed and discharge rates and other carburization conditions when the set carburization rate and an actual carburization rate are equal (S8-S15), and correcting the set carburization rate when a difference between the set carburization rate and an actual carburization rate is large, and correcting the strip feed rate while correcting the composition of the atmospheric gas when a difference between the predetermined carburization rate and set carburization rate is large (S9).

IPC 1-7

C23C 8/22

IPC 8 full level

C23C 8/22 (2006.01)

CPC (source: EP)

C23C 8/22 (2013.01)

Citation (search report)

[A] US 4950334 A 19900821 - NISHIOKA NOBUO [JP], et al
[A] US 3950192 A 19760413 - GOLLAND DAVID I, et al
[A] DE 2152440 A1 19721026 - BBC BROWN BOVERI & CIE
[A] DE 3139622 A1 19830421 - WUENNING JOACHIM
[A] DE 2835444 A1 19800228 - BBC BROWN BOVERI & CIE
[A] DE 1934145 A1 19710121 - HARTMANN & BRAUN AG
[A] DE 1942281 A1 19710304 - HARTMANN & BRAUN AG
[A] DE 2152439 A1 19721026 - BBC BROWN BOVERI & CIE
[A] PATENT ABSTRACTS OF JAPAN vol. 16, no. 351 (C - 0968) 29 July 1992 (1992-07-29)
See references of WO 9409175A1

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

WO 9409175 A1 19940428; CA 2125785 A1 19940428; DE 69310897 D1 19970626; DE 69310897 T2 19980108; EP 0626467 A1 19941130; EP 0626467 A4 19950301; EP 0626467 B1 19970521; KR 100266037 B1 20000915

DOCDB simple family (application)

JP 9301486 W 19931015; CA 2125785 A 19931015; DE 69310897 T 19931015; EP 93922640 A 19931015; KR 19940702014 A 19940613