Inland Steel Company

Indra Gupta

Richard S Cline

Kenneth M Gaskey

Timothy E Moss

Raymond V Fostini

A novel pre-quench zone is provided between the soak section and the water quench section of a continuous annealing line. The pre-quench section has multiple passes, and each pass has gas jet cooling tubes and heaters disposed along the path of movement of the strip. By selective operation of the gas jet cooling tubes or the heaters or both, the pre-quench zone provides a wide range of cooling capabilities and cooling rates so as to achieve a quench temperature ranging from 455.degree. C. to 955.degree. C. (850.degree.-1750.degree. F.) using either light or heavy gauge strip and without changing the normal line speed.

Continuous annealing apparatus and method

A cold rolled steel strip is provided with a relatively high yield strength together with good resistance spot weldability, while avoiding rolling problems during its manufacture. This is accomplished by adding, to plain carbon steel, phosphorus in an amount greater than 0.04 wt. % up to 0.15 wt. % and 0.04-0.14 wt. % titanium.

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Munster, IN, United States of America

Indra Gupta