Effect of Si on High-temperature Oxidation of Steels during Reheating and Hot Rolling

A series of hot rolling processes with different reduction percentages (10%, 30%, and 50%) were applied to a high-carbon high-chromium tool steel (2HCTS). Microstructural evolutions, wear behavior, high-temperature oxidation, and aqueous corrosion properties were investigated. The results revealed the breakage and dissolution of primary carbides and a uniform carbide distribution after the hot rolling process. It was proposed that the presence of higher amounts of dissolved chromium in the hot rolled samples leads to the formation of Cr-rich oxides with more protection and less porosity at high temperatures, as well as an improved corrosion behavior in 3.5 wt% NaCl solution. This improvement in the corrosion behavior is not at the expense of the degradation of wear resistance. Probable mechanisms for carbides dissolution are also discussed.

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Alleviation of high-temperature oxidation and cracking of water-cooled roll for hot-rolling steel

Journal of Mechanical Science and Technology ◽

10.1007/s12206-019-1125-0 ◽

2019 ◽

Vol 33 (12) ◽

pp. 5787-5796

Author(s):

Yong-Joon Lee ◽

Kyung-Woo Yi

Keyword(s):

High Temperature ◽

Hot Rolling ◽

High Temperature Oxidation ◽

Temperature Oxidation

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Effect of Si on High-Temperature Oxidation of Steel during Hot Rolling

Diffusion in Solids and Liquids III - Defect and Diffusion Forum ◽

10.4028/3-908451-51-5.655 ◽

2008 ◽

pp. 655-660

Author(s):

Lucia Suarez ◽

Juergen Schneider ◽

Yvan Houbaert

Keyword(s):

High Temperature ◽

Hot Rolling ◽

High Temperature Oxidation ◽

Temperature Oxidation

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Effect of Si on High-Temperature Oxidation of Steel during Hot Rolling

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.273-276.655 ◽

2008 ◽

Vol 273-276 ◽

pp. 655-660 ◽

Cited By ~ 2

Author(s):

Lucia Suarez ◽

Juergen Schneider ◽

Yvan Houbaert

Keyword(s):

High Temperature ◽

Hot Rolling ◽

High Temperature Oxidation ◽

Surface Defects ◽

Steel Strip ◽

Surface Oxidation ◽

Strip Surface ◽

Temperature Oxidation ◽

Scale Properties ◽

Specific Oxidation

An oxide scale layer always forms at the strip surface during the hot rolling process. As a consequence, de-scaling and pickling operations must be performed prior or after hot rolling. Many surface defects caused by hot rolling are related to oxidation in the reheating furnace. One of these is the melting of eutectic FeO/Fe2SiO4 during reheating over 1170°C giving as a result red scale defects in Si-added steel. On the other hand, steel strip surface oxidation during hot rolling causes an industrial and environmental problem: secondary oxide is removed after roughing, but tertiary oxide scales already start to form before entering the finishing stands. Their properties affect the final steel surface quality and its response to further processing. Furthermore, the addition of alloying elements has an important impact on scale properties. In particular the alloying of silicon effects the region between scale and substrate. It causes peculiar surface properties inherited from its specific oxidation characteristics. Conventional oxidation experiments in air of silicon steels are a valuable tool to study the influence of Si on steel oxidation. After oxidation in air in the temperature range of 900-1250°C it has been observed that Si enhance markedly scale adhesion, especially above 1177°C (the eutectic temperature of FeO-Fe2SiO4 ) and also at lower temperatures. Special attention has been paid on the investigation of the effects of alloying Si on the high-temperature oxidation of steel, for a better understanding of the behaviour of modern steels during hot rolling.

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Suppression of Surface Hot Shortness Caused by Copper during Hot Rolling

Materials Science Forum ◽

10.4028/www.scientific.net/msf.696.183 ◽

2011 ◽

Vol 696 ◽

pp. 183-188

Author(s):

Yasumitsu Kondo

Keyword(s):

High Temperature ◽

Hot Rolling ◽

Copper Content ◽

High Temperature Oxidation ◽

Tensile Tests ◽

Temperature Oxidation ◽

Magnetite Layer ◽

Hot Shortness ◽

Copper Distribution ◽

Surface Hot Shortness

Since copper content in steel causes hot shortness, it is important to understand copper behaviour during high-temperature oxidation, in order to control the precipitated copper. This study examines copper distribution during the oxidation of steel. From the oxidation tests, it is shown that precipitated copper existing in the scale/steel interface is absorbed into the magnetite layer or evaporates into the atmosphere. Then, a proposed method to suppress hot shortness is tested by oxidation-tensile tests at high temperature and is proven to be effective.

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