High temperature oxidation of low alloy steels

Chang, Yao-Nan; Wei, Feng

doi:10.1007/bf00660927

Cited by 93 publications

(43 citation statements)

References 23 publications

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“…23) For such steels, initially the oxidation kinetics are parabolic and then deviate from the parabolic law as the protective layer, rich in alloying elements, becomes established. However, aluminium, as an alloying element, can increase the temperature of wüstite formation and thus can contribute towards oxidation resistance.…”

Section: High Temperature Oxidation Of Steelmentioning

confidence: 99%

Modelling the Behaviour of Oxide Scale in Hot Rolling

Krzyżanowski

Beynon

2006

ISIJ International

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In the hot strip mill, the slab is brought to temperature in the reheating furnace and discharged for rolling. To break the primary scale, the slab is passed through a slab descaler before the reversing roughing mill. A secondary oxide scale is inevitably formed between successive rolling passes during hot rolling, which is further removed by high pressure water jets before the subsequent passes during reversing rolling or before the strip enters the tandem finishing mill. Whether the oxide scale is deformed or fractures, it will inevitably affect the interaction between tool and workpiece for several reasons: the thermal conductivity of the oxide scale is significantly less than that of the steel 1); fractured scale can enable direct contact of hot metal with the cold tool 2,3) ; because of the possibility of sliding of the fractured scale raft due to weakness of the scale/metal interface at high temperatures 4) ; and because the location of the plane of sliding is determined by the cohesive strength at the different interfaces within the multilayer oxide/metal system and by the stress distribution when delamination within the scale takes place. 5)The oxide scale on the surface of the hot metal is important for the control of friction and heat transfer when in contact with the roll, as well as influencing the rate of heat loss between rolling deformations under air or water sprays. During multi-pass hot rolling of long products, the magnitude of the coefficient of friction within the roll bite is variable due to the complex pressure-slip variations. A new Coulomb-Norton type friction model for long products and bar sections has been developed recently at Swinden Technology Centre (Corus RD&T UK).6) Among other assumptions, the model takes into consideration some complex interactions at the stock-roll interface due to the presence of secondary oxide scale, as mentioned above. Hence, the different modes of scale failure, such as the through-thickness cracking and the sliding mode, depending on the temperature and steel composition, have been implemented into the mathematical model. The friction force occurs either between the roll surface and oxide scale or between the roll surface, the oxide scale fragments and eventually fresh steel extruded through the scale gaps depending on the relative magnitude of the shear stresses inside the scale layer and at the oxide scale/stock interface. An additional point of consideration is the demand for increasingly small final thicknesses of the hot rolled steel strip, approximately 1.2 mm during conventional rolling and 0.8-1.0 mm for ultra-thin hot rolled strips produced on mini-mills using endless rolling technology.7) The scale related imperfections formed on upper and lower surfaces of the thin strip affect deformation of subsurface layers of the material during rolling which become relatively more pronounced during rolling of the very thin strips.Perhaps of greater and growing importance is the role played by the oxide scale in determining the quality of the surface of t...

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Section: High Temperature Oxidation Of Steelmentioning

confidence: 99%

Modelling the Behaviour of Oxide Scale in Hot Rolling

Krzyżanowski

Beynon

2006

ISIJ International

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“…As principais classes utilizadas são aços baixa liga, aços inoxidáveis e superligas. Dentre essas, os aços baixa liga são os mais econômicos, porém, mais susceptíveis à oxidação em altas temperaturas, sendo utilizados mais comumente em aplicações estruturais WEI, 1989 Ligas ferrosas com outros elementos protetores, como silício e alumínio serão discutidas em itens subsequentes. Porém, a presença destes elementos em aços inoxidáveis Fe-Cr revelou caráter benéfico, como mostra a Figura 7, apresentando os efeitos da adição de diversos elementos de liga na resistência à oxidação de aços inoxidáveis quando submetidos à ação de gases em alta temperatura (SEDRIKS, 1979).…”

Section: Ligas Ferrosas -Oxidação E Outras Propriedadesunclassified

Oxidação cíclica em alta temperatura de ligas ferrosas fundidas de baixo custo

Malafaia¹

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“…Low carbon steels are cheaper than high alloyed steels, but cannot be used in high-temperature corrosive environments due to their insufficient hightemperature corrosion resistance 1,2) . Hence, they should be protected by the suitable coating in order to be used as high-temperature structural components in automobile exhaust systems, heating/ventilation systems, chemical, power, or refinery plants.…”

Section: Introductionmentioning

confidence: 99%

Aluminizing and Corrosion of Carbon Steels in N₂/0.5%H₂S Gas at 650-850℃

Abro¹,

Lee²

2015

Journal of the Korean institute of surface engineering

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AbstractsThe effect of hot-dip aluminizing on the corrosion of the low carbon steel was studied at 650-850 o C for 20-50 h in N 2 /0.5% H 2 S gas. The aluminized steel consisted primarily of the Al topcoat and the underlying Al-Fe alloy layer. Aluminizing drastically improved the corrosion resistance by forming the α-Al 2 O 3 surface scale. Without aluminizing, the steel formed nonadherent, fragile, thick scales, which consisted of FeS as the major phase and iron oxides such as FeO, Fe 3 O 4 and Fe 2 O 3 as minor ones.

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High temperature oxidation of low alloy steels

Cited by 93 publications

References 23 publications

Modelling the Behaviour of Oxide Scale in Hot Rolling

Modelling the Behaviour of Oxide Scale in Hot Rolling

Oxidação cíclica em alta temperatura de ligas ferrosas fundidas de baixo custo

Aluminizing and Corrosion of Carbon Steels in N₂/0.5%H₂S Gas at 650-850℃

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High temperature oxidation of low alloy steels

Cited by 93 publications

References 23 publications

Modelling the Behaviour of Oxide Scale in Hot Rolling

Modelling the Behaviour of Oxide Scale in Hot Rolling

Oxidação cíclica em alta temperatura de ligas ferrosas fundidas de baixo custo

Aluminizing and Corrosion of Carbon Steels in N2/0.5%H2S Gas at 650-850℃

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Product

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Aluminizing and Corrosion of Carbon Steels in N₂/0.5%H₂S Gas at 650-850℃