| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.26 ( June 1992 ) Artificial Intelligence and Wire Rods and Steel Bars ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Thermomechanically Control-Processed High Carbon Chromium Steel for Ball Bearing without Annealing Nobuhisa Tabata, Shozaburo Nakano, Yasuhiro Nakagawa, Yoshiji Yamamoto, Takayoshi Miura, Eisuke Yamanaka |
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Synopsis : High carbon chromium steels such as JIS SUJ2 for ball bearings have very high hardness under conventional hot-rolled conditions. Thus, these steels need soft-annealing treatments before undergoing cold forming such as saw cutting and cold shearing. However, these heat treatments, which need reheating at 700`800 for several hours followed by slow cooling, incur high cost and produce low quality. Therefore, techniques producing large diameter steel bars without soft-annealing process have been studied in the laboratory scale by applying the thermo-mechanical control process (TMCP). Low-temperature reheating and low-temperature rolling have accelerated transformation of austenite into pearlite, refined cementite plates and improved mechanical properties of as-rolled and/or spheroidized steels. |
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