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| Application of Large Deformation in High Temperature and Ultra Fast Cooling Process on Production of Pipeline Steel |
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Abstract The microstructural differences and mechanical properties of the tested steel rolled by ultra fast cooling process and traditional TMCP process were investigated by means of thermal simulation and laboratory hot rolling tests. It was demonstrated that condensate depression and nucleation rate increase with increasing cooling velocity and intracrystalline nucleation is main nucleation form of the new phase. Mechanical properties of the rolled plates in laboratory can exceed X90 grade because of the refining acicular ferrite, the dislocation with high density and the refining precipitation. Otherwise, the value of rolling force of high temperature process is lower than that of traditional TMCP process. Relaxation process makes mechanical properties of the tested plates worse because of grain growth coursing.
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Received: 21 August 2009
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2010, Vol. 45 
