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Abstract

Samples of interstitial free (IF) steel buried in MgO castable bonded by calcium aluminate cement (CA) in graphite crucibles were heated at 1600°C for 90 min. Total oxygen content (TOC) of the steel was examined after heating and the refractory was investigated by SEM and EDS. It was found that TOC was higher in IF steel samples in contact with MgO castables containing 3 or 5 wt-% CA than with castables containing 7 wt-% CA or without CA. A liquid layer formed between refractory oxide and molten steel separates the refractory oxides from molten steel and inhibits direct dissolution of oxides in the molten steel. Transfer of oxygen between the refractory oxide and molten steel occurs by the formation of CaO.Fe₂O₃ at the boundary between the refractory oxide and the liquid layer, diffusion of CaO.Fe₂O₃ in the liquid phase layer, decomposition of CaO.Fe₂O₃ and dissolution of FeO into the molten steel. W ith increasing CA content in MgO based castables the CaO content in molten steel increases, but iron oxide content decreases, leading to the result mentioned above.

Keywords

CALCIUM ALUMINATE CEMENT INTERSTITIAL FREE STEEL MAGNESIA CASTABLE REFRACTORY OXIDES TOTAL OXYGEN CONTENT

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References

HÄRKKI

and PALANDER

: Interceram, 1991, 40, 284–289.

KUCHAR

and HÄRKKE Proc

. Unitecr ‘93, São Paulo, Brazil, 1993, 1398–1410.

HÄRKKI

, RYTILÄ

, PALANDER

and SUNDSTRÖM

: Scand. J. Metall., 1990, 19, 116–126.

GORO

, SABURO

, MICHIHIKO

and JUNICHE

Iron Steel, 1983, 69, 278 (in Japanese).

, N. u and WEI

: Naihuo Cailiao, 2003, 37, 22–24 (in Chinese).

BOHER

, LEHMANN

and GATELLIER

: Proc. Unitecr ‘01, November 2001, Cancun, Mexico, Vol. 1, 36–46.

LEHMANN

, BOHER

and KAERLE

M. C.

: Proc. Int. Symp. On ‘Advances in refractories for the metallurgical industries’, Montreal, Canada, August 1996, 151–165.

WEI

, LI

, KUANG

and CHEN

: interCeraM, 2002, 51, 200–205.

WEI

and LI

: Iron Steelmaker, 2002, 29, (4), 17–19.

10.

WEI

and LI

: Proc. Unitecr ‘01, Cancun, Mexico, November 2001, Vol. 1, 193–199.

11.

, WEI

and MYHRE

: Proc. Unitecr ‘01, Cancun, Mexico, November 2001, Vol. 1, 308–316.

12.

WEI

and LI

: Am. Ceram. Soc. Bull., 2002, 81, (5), 32–35.

13.

, H. u and WEI

: Br. Ceram. Trans., 2003, 102, 175–179.

14.

HUANG

: ‘Principles of ironmaking and steelmaking’, 116; 1997, Beijing, Metallurgical Industry Publishing House (in Chinese).

15.

YOON

B. H.

, HO

K.-H.

, KIM

J.-S.

and SOHN

H.-S.

: Ironmaking Steelmaking, 2002, 29, (5), 32–35.

Influence of calcium aluminate cement in magnesia castable on total oxygen content of interstitial free steel

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