Kuumavetokokeet teräslaaduille S960QC ja S700QL

摘要

Main purpose of this research was to determine mechanical properties of high-strength steelsS960QC and S700QL at elevated temperatures. Topic for the research came from Rautaruukki(nowadays SSAB) in Spring 2013. Actual physical testing was performed in Spring 2013 at laboratoryof Aalto-university. Used test equipment were tensile test device manufactured byRoell+Korthaus and a furnace manufactured by Maytec.Testing method in research was transient state testing where tension is kept constant and temperatureis raised until yielding happens. Also few checkup tests were performed by steady statemethod. Steel grades were also tested in room temperature to check actual yield stresses. The testresults were compared to earlier researches and to Eurocode (1993-1-2) calculating preferences.Results were slightly at the critical side when compared to Eurocode measurement.There were 35 test pieces of both steel grades available to test in this research. Amount of the testpieces were too small to determine uncertainty contributors. Most significant contributors aretemperature and strain rate and their different variations. These contributors are material dependantand therefore should be determined experimentally. In lack of any previous studies onthese steel grades a proper assessment of uncertainty of the results could not be done.