Basic Characteristics and Microstructure of High-carbon High Speed Steel Rolls for Hot Rolling Mill.

Gotō, Kunio; Matsuda, Yukio; Sakamoto, Kouichi; Sugimoto, Yoshihito

doi:10.2355/isijinternational.32.1184

Cited by 69 publications

(34 citation statements)

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“…One of the major defects which deteriorate surface quality is rolled-in-scale during hot-rolling, particularly within tandem finishing-mill stands. In recent years, high-speed steel rolls have been developed [1][2][3] to prolong the life of hot-rolling work-rolls and they promote the rolled-in-scale defects by increasing the friction coefficient. 4,5) The occurrence of rolled-in-scale defects strongly depends on adhesion of scales formed on steel surface by high temperature oxidation, and scale blistering during hotrolling seriously deteriorates surface quality by embedding fragmented scales into the steel substrate.…”

Section: Introductionmentioning

confidence: 99%

Effects of Chemical Composition and Oxidation Temperature on the Adhesion of Scale in Plain Carbon Steels.

et al. 2001

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Effects of chemical composition and oxidation temperature on blistering and delaminating of scales formed on steels were investigated. The scale blistering occurred for steels with P content above 0.005 mass%. Low carbon steels with 0.01mass%Si-0.2mass%Mn-0.01mass%P showed pronounced blistering at 1 223 K. The temperature at which the time to blistering is the shortest, the prominent temperature, decreased with increasing Mn and P contents and deceasing Si content in steels. There was no effect of C, S and sol. Al contents on the such specific temperature. The blistering was promoted by increasing C, Mn and P contents and suppressed by increasing S content at any temperature. The blistering was suppressed at 1 223 K by increasing Si content but promoted at 1 323 K. Sol. Al showed no effect on the acceleration of blistering. The blistering would be correlated to scale texture and segregation of minor elements at the interface between scale and substrate. {111} and {110} oriented crystals in {100} matrix of FeO, that were preferable with increased Si, Mn and P contents, decreased S content and oxidation temperature, accelerated the blistering. The segregated P promoted by increasing P content and decreasing oxidation temperature accelerated the blistering, whereas the segregated Si promoted by increasing Si content and decreasing oxidation temperature suppressed it.

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Section: Introductionmentioning

confidence: 99%

Effects of Chemical Composition and Oxidation Temperature on the Adhesion of Scale in Plain Carbon Steels.

et al. 2001

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“…The occurrence of different damage, i.e., cracks, fracture, plastic deformation and wear, are a consequence of the different magnitudes of the mentioned loads as well as their different mutual ratios, materials properties, etc. [1][2][3][4][5][6][7] Thus, in the case of cyclical subjection to high temperatures, i.e., the heating of rolls (also above 600°C) and their water cooling, these conditions lead to the occurrence of cracking on the die's surface, which appears in the shape of a crack network that consequently results in spalling of the die material that further leads to a deterioration of the surface finish of the workpiece. In hot-working rolls the thermal stresses are usually comparable or even larger than the mechanical stresses.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Several research works related to thermal fatigue resistance of die materials (i.e. steels, cast irons) were carried out where reasons for initiation and growth of cracks at hot working dies (forging, die casting) [17][18][19][20][21][22][23][24][25][26][27][28][29][30] and hot working rolls [3][4][5][6]9,[31][32][33][34] were investigated using various laboratory tests. However, detailed knowledge about the influence of the stress state, the temperature and the oxidation on the initiation and propagation of thermal cracks in hot working applications is still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…In hot-working rolls the thermal stresses are usually comparable or even larger than the mechanical stresses. [3][4][5][6][7][8][9][10] To increase the die's service time it is important and also the common task for both die designers as well as for producers of die steels, to shift the occurrence of cracks to later times and to decrease their growth rate. Hot working rolls are usually alloyed with Cr, V, Mo, W, and after solidification process they are heat treated accordingly.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of the thermal fatigue resistance for 3.1C, 0.8Si, 0.9Mn, 1.7Cr, 4.5Ni and 0.3Mo ICDP cast iron roll at 600 °C

Terčelj¹,

Fajfar²,

Godec³

et al. 2017

Mater. Tehnol.

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Using a new test rig the characteristics related to the thermal fatigue resistance for ICDP (Indefinite Chill Double Pour) cast iron for hot working rolls was investigated. Tests were carried out at 600°C to obtain the characteristics of cracks at (500, 1000 and 1500) cycles. For comparative purposes, additionally a test at 500°C was carried out. The average length of all the cracks, their density, average length of five longest cracks and relevant microstructural characteristics for the mentioned cycles were determined. It was found that the cracks initiation and their growth are related to the cracking and spalling of the carbides, shape of graphite, distribution of carbides and graphite particles, oxidation, etc. The obtained results contribute to a better understanding of the thermal cracking of selected roll cast iron. Based on these results the suggestions for improving the thermal fatigue resistance for the cast iron roll are given. Keywords: roll cast iron, thermal fatigue, cementite, graphite, cracks Novo razvita naprava je bila uporabljena za raziskave lastnosti ICDP litega`eleza, ki so povezane z odpornostjo na termi~no utrujanjem. Zna~ilnosti razpok so bile dolo~ene po (500, 1000 in 1500) ciklih, pri 600°C. Za primerjavo je bilo izvedenih nekaj testiranj tudi pri 500°C. Na osnovi rezultatov testiranj je bilo za vsako {tevilo ciklov dolo~ena povpre~na dol`ina vseh dobljenih razpok, njihova gostota, povpre~na dol`ina petih najdalj{ih razpok, vklju~no z ostalimi relevantnimi mikrostrukturnimi zna~ilnostmi. Rezultati so pokazali, da sta nukleacija in rast razpok tesno povezana s pokanjem in drobljenjem karbidov, z geometrijo grafita, z volumsko porazdelitvijo karbidov ter grafitnih delcev, z oksidacijo, itd. Rezultati prispevajo k bolj{emu razumevanju termi~nega pokanja izbranega materiala za valje. Na osnovi predstavljenih rezultatov so podani predlogi za izbolj{anje odpornosti litega`eleza za valje na termi~no utrujanje.

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“…The abrasion speed and exchange cycle of rolls have also accelerated because the quantity and speed of the rolling process have increased. Therefore, higher quality has been required for hot-rolling mill materials in terms of hardness, wear resistance, heat resistance, and lifetime, as well as a reduction in the production cost [1][2][3][4] . High-carbon high-speed steel type cast alloys (HCHSSs) have been developed as work roll materials for hot rolling.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen on the Microstructure and Hardness of High-Carbon High-Speed Tool Steel Type Alloys

et al. 2016

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The effect of nitrogen addition on the microstructure formation and hardness during solidi cation and heat treatment was investigated and the possibility of nitrogen as an alloying element was discussed in terms of alloy chemistry for high-carbon high-speed tool steel type cast alloys. Nitrogen with a concentration from 48 ppm to 1542 ppm was successfully introduced by mixing Cr 2 N into a molten alloy. Analysis of the diffraction pattern revealed that the primary V 2 CN carbonitride crystallized upon the addition of nitrogen, whereas eutectic carbides mainly formed in N-free specimens. The chemical composition of the carbonitride is also affected by the addition of nitrogen. With increasing quenching temperature, the Vickers hardness gradually increased to a peak and then decreased. Nitrogen addition helps to increase the hardness similarly to carbon. A N-containing specimen also exhibited superior secondary hardening after tempering. It is known that a large amount of residual austenite nally transforms to a hard martensite phase after tempering. According to the results of XRD analysis, nitrogen addition increases the volume fraction of retained austenite in the matrix at a higher holding temperature. Furthermore, the precipitation of nanosize carbonitride was observed around the primary V 2 CN carbonitride in addition to the standard precipitation. Therefore, this carbonitride precipitation may induce the superior secondary hardening and ultimately increase the macrohardness of N-containing specimens.

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Basic Characteristics and Microstructure of High-carbon High Speed Steel Rolls for Hot Rolling Mill.

Cited by 69 publications

References 0 publications

Effects of Chemical Composition and Oxidation Temperature on the Adhesion of Scale in Plain Carbon Steels.

Effects of Chemical Composition and Oxidation Temperature on the Adhesion of Scale in Plain Carbon Steels.

Characteristics of the thermal fatigue resistance for 3.1C, 0.8Si, 0.9Mn, 1.7Cr, 4.5Ni and 0.3Mo ICDP cast iron roll at 600 °C

Effect of Nitrogen on the Microstructure and Hardness of High-Carbon High-Speed Tool Steel Type Alloys

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