Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Optimization of Slab Reheating & Processing Temperatures for Flat and Long Products of High Strength Steels
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2013 (Swedish)Report (Refereed)
Abstract [sv]

The present work was carried out with the aim of reducing the initial slab reheating temperature before rolling while at the same time improving properties by optimisation of the steel composition and process parameters. Optimisation of slab reheating and hot rolling/cooling parameters in connection with heavy plate, strip and long products rolling has been carried out on a laboratory scale for high strength steels. The investigation has concerned six steels originating from SSAB EMEA (Borlänge and Oxelösund) and OVAKO Bar AB (Smedjebacken). Effects have been investigated of reduced slab reheating temperature (Treh), finish rolling temperature during thermo-mechanical processing (TMCP) and accelerated cooling rates (ACR=20-80°C/s) following hot rolling to the coiling temperature of 550°-600°C or to room temperature (RT). The results obtained for strip steels show also that a reduced reheating temperature (1220°C) combined with a high finish rolling temperatures and cooling rates over 20°C/s to coiling temperatures (Tcoil) of 550°-600°C produce very positive mechanical properties in the present steels. Improvements in the yield strength of heavy plate have been obtained by lowering the slab reheating temperature from 1240°C to 1160°C, especially in combination with high pass reductions of 15% and rapid cooling (~100°C/s) to RT. Yield stress improvement for the long product was obtained by lowering the slab reheating temperature from 1250°C to 1180°C and by increasing the cooling rate up to 5°C/s to RT. The results obtained in laboratory scale have been compared with full scale strips and long products of the present steels processed industrially in a same manner and a good agreement between these results has been observed. Analyses of precipitates (particles size and chemistry) in the specimens after TMCP processing were carried out using transmission electron microscopy. The results agree with expectations from ThermoCalc predictions of precipitate dissolution and show a close relationship with the observed microstructures and properties. Lowering the slab reheat temperature by 60-80°C reduces energy consumption by up to 14000 MWh per year and, as a result, reduces the release of CO2 emissions into the atmosphere by 3 600 tonnes per year during production of the present steels.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2013.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2013-101
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13058OAI: oai:DiVA.org:ri-13058DiVA: diva2:973252
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

Open Access in DiVA

No full text

By organisation
Swerea KIMAB
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar

Total: 13 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.27.0