Method of blackening treating a stainless steel strip surface

Details Method of blackening treating a stainless steel strip surface Method of blackening treating a stainless steel strip surface

1992-06-23

1994-04-26

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148606, C21D 108

Patent

active

053063546

ABSTRACT:
A blackening treating furnace includes a soot generation burner for blowing an incomplete combustion flame toward a surface of a cold-rolled stainless steel strip moving continuously through the furnace. A pair of secondary air nozzles installed at positions enclosing the incomplete combustion flame blow secondary air toward the surface of the stainless steel strip in directions perpendicular thereto or in directions slightly inclined toward the middle of the incomplete combustion flame. A flame guide air nozzle is installed between the pair of secondary air nozzles and an exhaust duct for drawing and discharging the combustion reaction flame of the incomplete combustion flame and secondary air along the direction of movement of the stainless steel strip. The flame guide air nozzle injects flame guide air toward the combustion reaction flame in a direction perpendicular to the direction of movement of the stainless steel strip or in a direction inclined thereto. The furnace is installed at the upstream side of a continuous annealing furnace and deposits soot on the surface of the stainless steel strip efficiently, uniformly and stably, so that the cold-rolled stainless steel strip can be annealed continuously.

REFERENCES:
patent: 4950334 (1990-08-01), Nishioka et al.

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