| 摘要 |
An improved method of heat treating a continuous strip of metallic material of indeterminate length in a continuous annealing furnace. The furnace includes a heating section having a plurality of gas jet heaters and a cooling section having a plurality of gas jet coolers. The continuous strip is heated and cooled in the heating and cooling sections within predetermined selected temperature ranges for the strip, by convection and solely with mixtures of hydrogen and nitrogen gases impinged against both sides of the strip through the gas jet heaters and the gas jet coolers. The temperatures of the strips in the heating and cooling section are monitored. Temperatures are controlled by varying the ratios of the mixtures of the heating and cooling gases which achieves and maintains the predetermined selected temperature ranges for the strip in the heating and cooling chambers despite changes in operating conditions.
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