Sumitomo Metal Industries, Inc.

Sumitomo Shipbuilding & Machinery Co., Ltd.

Makoto Tokuda

Hiroshi Tomono

Hajime Nashiwa

Akiyoshi Mori

Toyoaki Akiba

Takero Sato

Herein disclosed is a process for the addition of calcium to a molten steel which achieves an excellent yield and effect. The process is applied to molten steels having a chemical composition of carbon 0.02 to 0.55%, Silicon less than 0.50%, Manganese 0.20 to 2.50%, sulfur less than 0.010%, total oxygen content less than 100 ppm, quantities of other standard alloying elements and the balance being iron, and being maintained at a temperature of 1480.degree. to 1800.degree. C. The process is conducted either by shooting projectiles which include calcium into the molten steel or by continuously feeding a wire of a calcium containing material into the molten steel in an amount of 0.1 to 2.0 kg per ton of molten steel calculated on the basis of pure calcium so that the calcium content of the resulting steel becomes 0.05 to 0.8 times the sulfur content. The resulting steel has excellent low temperature impact characteristics.

Process for producing steel having improved low temperature impact

A measuring means for measuring secondary cooling zone roller gaps in continuous casting machine, wherein measuring means having detecting means for detecting the position of ingot support means are provided on dummy bars transferred through the secondary cooling zone, the ingot support roller gap being measured by the output signal of said detecting means. Each said detecting means is slidable, and output corresponding to its displacement range is measured and recorded.

Measuring means for measuring secondary cooling zone roller gaps in

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Wakayama, Japan

Makoto Tokuda