Research On Controlled Rolling And Controlled Cooling Of The C-Mn Super-fine Grain Steel

The works of this paper were carried out integrating with the 973 project of The Major Basic Research For New Generation Steel Materials and the 863 project of The Advanced Industrial Manufacture Technology Of 500MPa Carbon Steel. Hotsimulation experiments and hot rolling experiments of C-Mn steel were carried out in laboratory, controlled rolling and controlled cooling of the C-Mn super-fine grain steel were investigated. The main works involved as follows:1. The experiments ofSS400 steel were made at the Gleeble 2000 thermo-mechanical simulator in austenite without deformation and 55% compressive deformation with the different deformation pass. The continuous cooling transformation (CCT) curves were constructed in austenite without deformation and 55% compressive deformation at 860℃ .Microstructures in different condition were analy/.ed. Found austenite deformation accelerated ferrite transformation, refined ferrite grain size while increased the fraction of ferrite. Deformation increases the cooling rate of formed bainite and restrained the form of bainite.2. The double-hit compress experiments of ANS400 steel were made at the Gleeble 1500 thermo-mechanical simulator, the influence of cooling rate and deformation temperature on property of tested steel. Single pass compress deformation studied the influence of deformation amount on property of tested steel. The quenching microstructures at different temperature in double-hit compress experiments were observed.3. Hot rolling experiments of ANS400 steel and ANS500 steel were carried out in laboratory, the influence of heated temperature, rolling temperature, cooling rate and coiling temperature on the property of tested steel. TEM microstructures were observed. Theory basis were given to industrial production.Abstract4. On the basis of laboratory studies, industry trials of ANS400 steel and ANS500 steel were carried out in Ansteel and the expected goals were reached. Realized to produce 400MPa and 500MPa super steel in condition of present equipment in Ansteel.