THE INFLUENCE OF CONTROLLED ROLLING AND CONTROLLED COOLING ON THE MICROSTRUCTURE AND PROPERTIES OF 16Mn STEEL PLATE

This article has studied that both of the finish rolling temperature and cooling speeds after hot-rooling influence on the microstructure and mechanical properties. Experimental results demonstrate:1) appropriately reducing finish rooling temperature will improve mechanical properties of 16Mn steel plate. 2) as cooling speeds increasing after hot-rooling, strength of steel increases obviously,when cooling speeds between 5℃/s and 22℃/s. The plasticity and ductility come up to the standard value, at cooling speed of 5℃/s, 15℃/s and 38℃/s, yield-strengths make the grade of 35kgf/mm², 40kgf/mm² and 45kgf/mm²; respectively. Therefore controlled cooling after hot rooling is an effective method for increasing strength-ductility of 16Mn steel.