18.97.9.170
18.97.9.170
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SCIE SCOPUS
Al 탈산 대형 단조 탄소강에서 Ca 처리에 의한 황화물의 구상화로의 형상조절
Spheroidization of Sulphidic Inclusions in Aluminum - Deoxidized heavy Forged Carbon Steels by Calcium Treatment
김정태(Jeong Tae Kim), 변수일(Su Il Pyun), 황남철(Nam Chul Hwang)
UCI I410-ECN-0102-2008-580-001846325

The present work is concerned with spheroidization of sulphidic inclusions in the heavy forged carbon steels by Ca treatment. Three kinds of, reduction processes(ⓐ conventional Al-deoxidation ; ⓑ Si-deoxidation with subsequent Ca-and Zr-addition;ⓒ : Al-deoxidation with subsequent Ca-addition) were conducted to correlate the measured oxygen contents during the reduction with the morphology of non-metallic inclusions. Elongated sulphidic inclusions were observed in the forgings made from the process ⓐ. Coarse or spheroidized non-metallic inclusions were observed in the forgings from the process ⓑ, depending upon the amount of dissolved oxygen. However, finely spheroidized inclusions were uniformly distributed in the forgings from the process ⓒ, whose dissolved oxygen was controlled to below 5-l0ppm. The optimum plant conditions for the formation of the finely spheroidized inclusions were obtained as follows: 1) Dissolved oxygen and total oxygen contents in the killed steel should be below 5-l0ppm and 60-70ppm, respectively, before Ca is treated. 2) Al content in steels should be above 0.007-0.019% prior to Ca adding. 3) The effective ratio of % Ca_(eff) to % S is 0.53-0.80, which is provided by addition of 0.020-0.025% Ca.

[자료제공 : 네이버학술정보]
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