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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ì軓S‹Z•ñ KAWASAKI STEEL GIHO Vol. 23(1991) No.2 ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ |
| ˜A‘±’bˆ³–@‚É‚æ‚é’†S–³•ÎÍ‚Ì‚•iŽ¿ü–_»•i‚Ì»‘¢ Production of High Quality Rod and Bar by Applying Continuous Forging Process ú哇@Í–ç(Fumiya Yanagishima)@ŽR–{@‹`Ž¡(Yoshiji Yamamoto)@ì‰@³M(Masanobu Kawaberi)@“¡“c@—˜•v(Toshio Fujita)@’†–ì@ºŽO˜Y(Shozaburo Nakano)@óì@’å•v(Sadao Asakawa) |
| —vŽ| : “–ŽÐ‚ÍCü–_»•i‚Ì’†S•”‚Ì–³•Î͉»‚ð–Ú“I‚Æ‚µ‚ÄC˜A‘±’bˆ³–@‚ðŠJ”‚µC‚±‚Ì’bˆ³Ý”õ‚ð…“‡»“SŠNo.‚R˜A’’‹@‚ÉŒšÝ‚µ‚½B‚±‚Ì•û–@‚Å‚ÍCˆ³‰ºðŒ‚ð§Œä‚·‚邱‚Æ‚É‚æ‚èC’†S•”‚Ì–³•Î͉»‚Ì‚Ý‚¾‚¯‚Å‚Í‚È‚C‰»Šw¬•ª‚Ì”Z“x§Œä‚à‰Â”\‚Å‚ ‚éB–{–@‚ðü–_»•i‚É“K—p‚·‚邱‚Æ‚É‚æ‚èC‚’Y‘f|üÞ‚ÌLü«C‚¨‚æ‚ÑC‹@ŠB\‘¢—p’Y‘f|‚Ì’†S•”ƒhƒŠƒ‹œPE«‚ÉŠÖ‚µŒ°’˜‚ÈŒüãŒø‰Ê‚ª”F‚ß‚ç‚ꂽB‚Ü‚½C–³•Î͉»‚É”º‚¢Cƒ^ƒ“ƒfƒBƒbƒVƒ…—n|‰ß”M“x㸂ª‚Í‚©‚ê‰îÝ•¨‚̒ጸ‚à‰Â”\‚Æ‚È‚Á‚½‚½‚ßCŽ²Žó|‚Ì“]“®Žõ–½‚ÌŒüã‚à”F‚ß‚ç‚ꂽB |
| Synopsis : Kawasaki Steel has developed a continuous forging process capable of producing rods and bars with no center segregation and installed a continuous forging machine at No.3 continuous bloom caster at Mizushima Works. The method also makers it possible to control the chemical composition at the center portion of blooms. The application of this method to obtain the optimum chemistry at the center portion of continuously cast blooms has resulted in a noticeable improvement in the drawability of high-carbon rods and the ease of drilling at the center portion of carbon steel for machine structural use. Because of the elimination of segregation problem, this method makes it possible to increase the super-heat at the tundish and thus reduce the number of non-metallic inclusions; thus, improved rolling-contact fatigue life has also been obtained in bearing steel. |
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