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Roll Technology & Maintenance
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Roll Technology & Maintenance
- Silvia Barella (Politecnico di Milano)
Description
3.1.2
High speed steel rolls (HSS) have replaced the traditional high chromium iron rolls (HCI) in many hot strip mills and acicular rolls in log products mills showing very good results for quality and productivity improvements. This paper describes The effect of ferrovanadium inoculation on the microstructure and properties of high speed steel (HSS) used for light section mill was...
Sleeves using in initial stands of rebar rolling in danieli mills are cast iron or ferritic cast iron generally. Application of this material meet the demands of mills especially wear resistant and reduction of fire cracks. But in some cases mills face problems in coupling fracture in sleeves. Cast irons have lower fracture toughness ratio to steels grade. Although steel grades have lower...
Cast high-speed steel (HSS) work rolls are used in roughing and finishing stands of hot rolling mills, as they possess high hardness and wear resistance, which is responsible for their great durability in service. During the rolling process, depending on the operating conditions in the respective stand, the degradation of the work rolls is caused by a combination of thermal fatigue, rolling...
Nowadays grinding balls production process is mainly done by casting or by pressing, processes which involves anyway low productivity and poor quality on finished products.
PERT has developed a new revolutionary rolling mill to produce high quality grinding balls by rolling process, starting from a round bar coming from upstream bar mill rolling.
Round bars are heated up by a traditional...
Machine parts, like chocks, rollers, HGC cylinders or gearbox housings, are the backbone of every rolling operation for section and flat rolling mills. They are essential for the delicate production process and ensure perfect product quality, tolerances and dimensions. However, rough operating conditions, such as elevated temperatures, corrosive media, high static/cyclic loads and abrasion,...
As the time between roll changes is continuously increasing due to improved performances of roughing rolls, a newer problem is that the performance of the edger roll becomes a bottleneck inducing strip defects crises and mill (unplanned) stoppages only to change the edger rolls. Additionally, worldwide the supply of edger rolls is becoming a problem. Especially for European hot strip mills...
Hot strip mills require higher-quality, incident-free rolls to enhance productivity in the production of technical strips with stringent surface quality requirements. This necessitates rolling engineers to innovate new operational designs. The spin-cast HSS grade roll, engineered in Europe, stands as one of the most advanced grades developed over decades. Despite being a mature product, there...