System for high rate cooling furnace for metal strips

Details System for high rate cooling furnace for metal strips System for high rate cooling furnace for metal strips

1998-10-14

2000-10-03

Kastler, Scott

Metallurgical apparatus

Process

Cooling

266111, 266159, C21B 710

Patent

active

061268917

ABSTRACT:
Rapid-cooling oven, forming part of a plant comprising various treatment stations, especially stations for the heat treatment of products in strip form, through which a metal strip runs continuously, the rapid cooling being obtained by spraying onto the strip a jet of an atmosphere gas consisting of a nitrogen/hydrogen mixture having a hydrogen content which is greater than 15%, and preferably close to 50%, the atmosphere gas being recirculated using a circuit of recirculation ducts comprising compensators made in the form of a series of corrugations allowing all the ducts to expand, at least one fan and at least one gas/water exchanger, wherein a safety device is provided to prevent this ingress of air into the circuit for recirculating the cooling gas or any leak of the latter into the environment, in the event of a break in a corrugation of a compensator or in the case of a leak form the latter, said safety device being made in the form of a flexible membrane impermeable to the cooling gas, the said membrane being placed around each of the compensators of the recirculation duct, a means being furthermore provided for immediately interrupting the flow of the cooling gas in its recirculation circuit.

REFERENCES:
patent: 4600181 (1986-07-01), Falco et al.
patent: 4704167 (1987-11-01), Ichida et al.
patent: 5472528 (1995-12-01), Boyer

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