| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.32 ( March 1995 ) Ironmaking Technology, Secondary Refining, and Center-Segregation Control with Forging in CC ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Improvement of Properties of Rods and Bars by Continuous Forging Process Masanobu Kawaberi, Yoshiji Yamamoto, Kazuo Asoh |
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Synopsis : Kawasaki Steel has developed a continuous forging process capable of producing rods and bars with neither center segregation nor center porocities. This method also makes it possible to control the center segregation ratio less than 1.0. The application of this method has improved a rolling-contact fatigue life of bearing steel, and has annihilated inner porocities of big size diameter bars made from continuously cast bloom. By utilizing the negative segregation obtained by this method, the carbon steel bars for machine structural use can be easily drilled at center portion due to a decrease in hardness. The alloy steel rods for machine structural use also can be drawn at high speed, and the high carbon steel rods can be processed without heat treatment due to an increase in drawability. This method makes it easier to increase tensile strength of final products by applying higher carbon steels. |
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