Study On The Reason Of Lamination Crack In Ship Plate

This topic associates the practical production of an shan steel company, basing on mang tracings and investigations of production process, we examine and analyse the product of high strength hull steel, and we clearly conclude the reason for the tension lamination comartiton, and we also do research of the influence generated by the rolling process to the high strength hull steel tension lamination. Microstructure ,fractsure pattern and foreign materials of the steel were observed by SEM ,TEM and OM. After analysis of the qualified high strength hull steel and sub-qualified ones ,we obtained the influence of thickness of the steel on lamination result from cracked fracture,the influence of mechanical property on lamination reault from cracked fracture. The influence of rolling process on lamination of hull steel.1,The steel plate appears the fracture lamination, mainly is the loose hole and the inclusion which by the board thick center place belt-shaped organization segregation, has not rolled over gathers causes.2,In the rolling process, uses greatly presses the regulations rolling, enhances stress strain the penetration coefficient, causes to cast the flaw which in the semifinished product produces as far as possible , thus is advantageous to reduces the steel plate the lamination flaw.3,Through pure smelting, reduces Lian Zhupi the center segregation degree, reasonably adjusts the tmcp craft system to be allowed to reduce or to eliminate the steel plate the stretch fracture stratification.4,Through Controlledr oiling and Controlled Cooling to improve configuration of inclusion, and advantageous to reduces place belt-shaped organization causeing by rolling process ,...