Abstract
Indefinite chill (IC) roll and high speed steel (HSS) materials have been widely employed to manufacture work rolls as latter and former stands in hot rolling mills. The oxidation of work rolls is of importance for the surface quality of the rolled workpieces. The isothermal oxidation of the IC and HSS materials was conducted at 650 °C and 700 °C in both dry air and humid air. The isothermal oxidation curves indicate that HSS shows faster kinetics than the IC materials in dry air, whereas the opposite occurred in humid air. The oxide scales of the IC materials after the oxidation in both dry air and humid air are made up of two oxide phases. Two oxide phases were found when the HSS oxidized in the dry air and three oxide phases were found when oxidized in the humid air.
Highlights
Hot rolling is one of the primary manufacturing processes in the steel industry, which is highly dependent on the property of work rolls
The purpose of this paper is to investigate and compare the oxidation behavior of the indefinite chill (IC) and the high speed steel (HSS) roll materials by a combined study of the oxidation kinetics, surface morphology and cross sections of the oxide scales formed in both dry and humid atmospheres
Three different phases can be identified in the IC material (Figure 1a), 3
Summary
Hot rolling is one of the primary manufacturing processes in the steel industry, which is highly dependent on the property of work rolls. Hi-Cr rolls with 18% Cr are oxidation-resistant and result in the attachment of rolled materials onto work rolls. Adjustments were made to reduce Cr to less than 7% and add Mo, V, W and C to develop HSS [4,5,6,7]. They present high wear resistance and strength but are still difficult to oxidize. Further modifications were made to develop IC roll materials, including a considerable amount of graphite, showing a good thermal and oxidation behavior [8,9,10]. The graphite in the IC rolls can retard crack propagation and overcome sticking, since it lubricates the contact between the roll and the rolled strips [11,12,13]
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