BEGIN:VCALENDAR
VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 28
SUMMARY:New process for hot rolling of high-strength pipe steels
DESCRIPTION:New process for hot rolling of high-strength pipe steels
A. Büttgen, A. Kern, C. Konrad, A. Latz, C. Straub
thyssenkrupp Steel Europe, Duisburg

Due to the ecological and economic situation worldwide and the resulting steadily increasing demand for pipelines, more and more efficiency of the hot strip manufacturing process to produce pipe steels is required.
To achieve the demanding mechanical properties of modern pipe steels in terms of strength and resistance to brittle fracture, a very fine ferritic microstructure is crucial. So far, thermomechanical rolling with final rolling temperatures as low as 780 °C has been the method of choice. Unfortunately, this process reduces the plant performance due to noticeable delay times between roughing and finishing. Moreover, inhomogeneities become more pronounced along the strip, which deteriorates the performance of the product. 
To overcome this problem, a new rolling strategy for high-strength pipe steels was developed supported by numerical modelling of the microstructure and mechanical properties. In conjunction with a simultaneous adjustment of the cooling strategy with increased cooling rates, roughing and especially finishing can be carried out more gently. The resulting ferritic or ferritic-bainitic microstructure leads to at least a consistent product performance.  
This paper gives an overview on the characteristics of the new rolling strategy and presents first production results: The operational rolling results of pipe grade X70 show that the novel process leads to an increase in the performance of the hot strip mill compared to classical thermomechanical rolling. At the same time, the system load was significantly reduced and the product performance in terms of strength and resistance to brittle fracture was kept constant.

CLASS:PUBLIC
DTSTART:20230615T100000
DTEND:20230615T102000
END:VEVENT
END:VCALENDAR