Nippon Steel Corporation

Mitsubishi Kinzoku Kabushiki Kaisha

Kouji Tanabe

Akira Usami

Tatsuo Kojima

Kouki Katou

Takashi Yatsuzuka

Takashi Inoue

Tetsuya Ohba

Tatsunobu Kobayashi

The invention relates to a steel plate which exhibits a good resistance to a corrosive atmosphere, containing weakly acidic condensed water comprising SO.sub.2, Cl.sup.- ion, and CO.sub.2 such as the exhaust gas from a boiler which burns LNG. The steel plate having a good corrosion resistance to condensed water characterized in comprising a low C content, a low Mn content and a medium amount of Cr content, and further 0.01% or less of S in an unavoidable impurity, or further comprising at least one element of Si, Al, Cu, Ni, Mo, Nb, V, Ti, Ca, and B. More, the steel plate having a good corrosion resistance to condensed water comprising carbonic acid gas and chloride ion characterized in comprising a low C content, a low Mn content, P, Cu and Ni, and further 0.01% or less of S in an unavoidable impurity, or further comprising at least one element of Si, Al, Mo, Nb, V, Ti, Ca and B.

Steel plate having good corrosion resistance to condensed water

A roll for a mill includes a roll shaft having a tapered portion disposed intermediate opposite ends thereof. The tapered portion has an outer peripheral surface tapering axially of the roll shaft. A ring of a wear-resistant material is disposed around the tapered portion of the roll shaft. A tubular sleeve having an inner peripheral surface tapering axially thereof is press-fitted between the tapered portion of the roll shaft and the ring to retain the ring in place on the roll shaft for rotation therewith. The sleeve includes an inner groove formed in the inner peripheral surface thereof and a passageway formed therethrough. The passageway is communicated with the inner groove so that pressurized oil is supplied through the passageway into the inner groove.

Roll for mill

Growing community of inventors

Muroran, Japan

Kouji Tanabe