open access

https://hdl.handle.net/2115/75681

Simulation Test for Crystallization of Inclusions in Semi-killed Steels during Heat Treatment Prior to Hot Rolling

英語

Heat treatment cycle

2008-06-15

日本鉄鋼協会

ISIJ International

48(6)

747-754

The SHTT (Single Hot Thermocouple Technique) has been used to determine the crystallization behavior of a composition of the CaO–Al2O3–SiO2 system, representative of inclusions in semi-killed steels. XRD and SEM have been employed, respectively, to detect the crystalline phases and to analyze the morphology, quantity and properties of crystals. The same composition has also been studied by quenching the oxides in iron crucibles, a method which had been proven reliable to simulate the actual behavior of inclusions in steel samples during heat treatment prior to hot rolling. The TTT diagrams obtained by using the above two techniques are almost identical. The observed crystalline phases for this composition are gehlenite (2CaO·Al2O3·SiO2) and anorthite (CaO·Al2O3·2SiO2). The TTT diagram from SHTT gives the nose position of gehlenite and anorthite of, respectively, 1200 s at 1200°C and 4800 s at 1300°C. Thus, the Hot Thermocouple Technique (DHTT or SHTT), already largely used to study the crystallization behavior of CC mold slags is shown to be suitable to simulate the crystallization behavior of inclusions with much higher SiO2 contents.

学術雑誌論文

Version of Record

著作権は日本鉄鋼協会にある

0915-1559

1347-5460

AA10680712