A trial with three different gradesof HSS rollsin t he 2050 mm HSM of Iscor showed that the chromium content isan important factor asconcer n the speed of formation, adherence and thicknessof the roll oxide film 3. OPTIMISATION OF HSS ROLLS. The poor reaction to incidentsof the HSS rollshasbeen an important obstacle to a more intensive use.
treatment processes of HSS rolls can not be planned by using the conventional ones of high speed tool steels. At present, since there is no detailed study on the quenching treatment of centrifugal casting HSS rolls, it is still very difficult to select an appropriate heat treatment process for HSS rolls based on their chemical compositions only.
the high speed steels for rolls (HSS for rolls) to be based on the composition of the M2 steel. Thus, although the roll makers have developed alloys specifically designed to the operational conditions of each hot- strip mill plant, their chemical compositions often fall into the following ranges: 1.5–
A study on solidification process of centrifugal cast high-speed steel (HSS) rolls and the crack forming condition is discussed. The result was represented that the crack forming was because of ...
The introduction of HSS rolls to the Hot-Strip mill is a very recent event (1991) and thus it presents a lot of areas and challenges which need to be studied and analyzed. The objective of this investigation was to study the thermal behaviour of HSS rolls in the finishing mill using the process modelling approach. The objective was achieved by
In the last years a great number of hot strip mills performed trials with High Speed Steel (HSS) rolls for both rougher and finishing stands. Rolls used in the former stands are subjected to higher temperatures, slower rolling speeds and longer contact lengths between roll and stock due to the high reductions. Therefore, they require high ...
Hollow Structural Sections (HSS) are manufactured hollow steel sections, typically of circular, rectangular, or square cross-section. In the United States, HSS sections conform to either the ASTM Specification A500 or A1085. The use of HSS is growing with popularity all around the world in the building industry and in the United States accounts ...
hss rolls. The microstructure consists of tempered bainitic / martensitic matrix with primary and secondary carbides. Primary carbides MC, M7C3, M6C and M2C are originated during the eutectic solidification. Secondary carbides are precipitated during the High Temperature quench and tempering. The rolls are cast with the right structure to ...
Work rolls in the hot strip mill withstand extreme service conditions, especially when electrical steels are rolled, resulting in severe roll wear and fatigue. High-speed steel (HSS) work rolls and rolling lubrication are applied to the mill to improve roll wear and fatigue. Tests show that HSS work rolls manifest good performance in wear, fatigue and …
An HSS/DCI composite roll with a diameter of 350 mm and a composite height of 264 mm was fabricated, and stress relief annealing was carried out at 750°C for six hours. Figure 2 presents the schematic diagram of the analytical specimens.
The better performance of the HSS rolls, in comparison to the forerunner work roll materials, is related to its microstructure characteristics: great amount of very hard (2800–3000 HV), fine and discontinuous MC eutectic carbides and a matrix hardened by secondary precipitated carbides.
These rolls have high wear resist ant shell with minimal drop ... HIGH SPEED STEEL ROLLS HSS Shell Photomicrograph (Hs 77-82 °Sh'C') Regd. Office : XLRI New Administrative Building, Circuit House Area (East) Jamshedpur - 831 001, India t Phone : 91 657 2231384 t Fax : 91 657 2226435
A total of twenty rodlike HSS electrodes (diameter = 30 mm and length = 1500 mm) uniformly distributed around the DCI core were remelted in the high-temperature slag bath, and liquid droplets went through the slag bath and entered the gap between the mold and the roll core to form a molten metal bath of the HSS layer around the roll core . The ...
Abstract and Figures. High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperatures, are defining features of HSS ...
The HSS rolls have good thermal stability, and the roll surface has high hardness and good wear resistance at rolling temperature. The HSS rolls have good hardenability, and the …
hss rolls бутлах нунтаглагч HSS Rolls The material of HSS contains plenty of alloyed elements such as Mo, V, W, Cr etc. Indefinite Chill Cast Iron Roll The enhanced alloy …
speed steel (HSS) bimetallic rolls used for hot strip rolling. In this chapter, the characteristics of the HSS rolls were introduced compared with the conventional single material rolls. An in addition, the development, applications and the different manufacturing methods of the HSS rolls were briefly introduced.
Hollow Structural Sections (HSS) are manufactured hollow steel sections, typically of circular, rectangular, or square cross-section. In the United States, HSS sections conform to either the ASTM Specification A500 or A1085.
HSS Rolls are successfully replacing other conventional rolls which were till date being used in bar mills, structural mills and strip mills. Since the HSS Rolls have a longer product life the mills using these rolls vouch for …
Some of the mills have also tried using high speed steel (HSS) rolls at initial stands. Wear resistance of HSS rolls have been found 3 to 4 times superior than that of Hi-Cr rolls . Application of HSS or semi-HSS work rolls in roughing mills is also found beneficial over chromium steel rolls . However, there are some limitations in using HSS …
HSS * Rolls * High-speed steel. Japan Advanced Roll has produced small HSS rolls in large numbers, having engaged in the development of HSS rolls for Sendzimir mills since the late 1950s. The company went on, in the 1980s, to successfully develop a technique for manufacturing HSS rolls with a composite structure for use in tandem mills, an ...
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HSS Rolls . The material of HSS contains plenty of alloyed elements such as Mo, V, W, Cr etc. Indefinite Chill Cast Iron Roll The enhanced alloy indefinite chilled cast iron roll is developed based on the common alloy infinite shilled cast iron roll, its process is achieved by, on the basic of 30%-40% cementite, 3-5% pallet-shaped graphite and martensite ...
HSS rolls have replaced high chrome iron-rolls and semi-HSS rolls have replaced high chorme steel rolls due to their better performance and technical characteristics, the released added. After a gap of more than three-decades, Tata and Yodogawa were coming together in furthering the relationship, the release added.
High speed steel rolls (HSS) have replaced the traditional high chromium iron rolls (HCI) in many hot strip mills, showing very good results for quality and productivity improvements. This paper ...
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HSS-rolls may have an intermediate layer between the outer and inner layers. As shown in Table 1, the HSS-roll material used for rolling rolls is white cast iron using an alloy similar to high-speed steel. Table 2 shows the comparison of the characteristics of CPC-HSS-rolls and CCM-HSS-rolls. When manufacturing a composite roll by combining ...
