Photo. 1. Scale banding in roughing mill work roll. Photo. 2. Etched micro-structure of alloyed grain iron roll. Photo. 3. Etched micro-structure of a

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Work Rolls in Hot Strip Mills Hidemaro KAWAHARA Synopsis: The work roll materials in hot strip mills and the damages of rolls which arise in rolling operation are discussed in this paper. As for the rolls in stands of the first half of a roughing mill train, wear and heat cracking are most important problems. The double-poured hard cast steel rolls give excellent rolling performances in these stands. As scale banding and surface deterioration of the rolls are maintroubles in stands of second half of the roughing train and in stands of the first half of finishingtrain, new adamite rolls with fine metallic structures give good results. Wear of roll surface, cracks, and surface spallings due to the rolling of cobbled sheet are main roll damages in the stands of the second half of the finishing train. In oder to prevent these damages, new double-poured alloyed grain rolls made by centrifugal casting method are used for these stands. (Received Nov. 30, 1970)

Photo. 1. Scale banding in roughing mill work roll. Photo. 2. Etched micro-structure of alloyed grain iron roll. Photo. 3. Etched micro-structure of adamite roll.

Table 1. Chemical composition and hardness of roughing work roll material. Fig. 1. Performance of the three kinds of roll used in reverse roughing mills.

Pnoto. Comet tail scale peeling at the roll surface in early stand of finishing train. Photo. 5. Scale banding at the roll surface in early stand of finishing train. Photo. 6. Scale banding resulting from deep heat checks.

Photo. 9. Rolled stock sticking on the banded roll surface. Photo. 7. Comet tail scale peeling caused by thermal fatigue cracks. Photo. 8. Heat checks progressing along carbide net work structure.

Photo. 10. Etched macro-structure of new developped adamite roll. Photo. 11. Etched macro-structucture of conventional adamite roll. Photo. 12. Partial scale disintegration at the roll surface (section through the roll surface). ~400 (4/5)

Fig. 2. Internal hardness distribution of the ordinary double-poured roll and new double-poured roll made by centrifugal casting method.

~20 (7/9) Photo. 13. Surface of hot sheet rolled by alloyed grain iron roll. ~ 20 (7/9) Photo. 14. Surface of hot sheet rolled by alloyed chilled iron roll. Photo. 15. View of typical break in roll body.

Fig. 3. Residual stress distribution in doublepoured alloyed grain roll. Fig. 4. Longitudinal stress in a roll during the hot rolling.

Photo. 16. Cracks due to the rolling of cobble sheet (after grinding). Photo. 17. Surface spalling due to the rolling of cobbled sheet. Fig. 5. Relation between the size of sheet and percentage of cobble.

Table 2. Influence of roll flattening on the thickness of rolled sheet.

16) M. DIGIOIA Jr. and F. PECK Jr: Iron Steel Eng., (1956) 12, p.121 18) G. SACHS: Z. Metallk., (1927) 19, p.352 19) F. PECK Jr. and T. MAVIS: Iron Steel Eng., 2) D. G. SACHS, V. LATORRE, and K. CHAKKO: Iron Steel Eng., (1961) 12. p.71 (1954) 6, p.45 20) M. BELANSKY, and F. PECK Jr.: Iron Steel 3) TAFEL: Flat Rolled Products, Metallurgical Eng., (1956) 3, p.62 Society Conferences, Vol.1 (1959) p.43 22) S. CERNI, S. WEINSTEIN, and F. ZOROWSKI: Iron Steel Eng., (1963) 9, p.165 6) R. V. WILLIAMS, and G. M. BOXALL: JISI, 24) D. KELLER: Iron Steel Eng., (1960) 12, p.171 (1965) 4, p.369 25) V. LATORRE and K. CHAKKO: Iron Steel Eng., 7) C. E. PETERSON: Iron Steel Eng., (1956) 12, p.98 (1962) 12, p.149 26) N. TONG, K. CHAKKO and V. LATORRE: Iron 8) W. J. WILLIAMS: Iron Steel, (1962) 8, p.372 Steel Eng., (1963) 7, p.113 27) N. TONG and, K. CHAKKO: Iron Steel Eng., 10) F. H. ALLISON Jr: Iron Steel Eng., (1956) 6, p.98 (1964) 7, p.143 28) K. CHAKKO and N. TONG: Iron Steel Eng., (1965) 10, p.141 29) H. ALLISON Jr.: Iron Steel Eng., (1966) 2, p.93 13) F. PECK Jr. and T. MAVIS: Iron Steel Eng., (1955) 8, p.121 14) F. PECK Jr. and T. MAVIS: Iron Steel Eng., (1956) 3, p.53 32) F. ZOROWSKI and S. WEINSTEIN: Iron Steel Eng., (1962) 6, p.103

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