LOW-CARBON AND LOW-ALLOY CASTING STEEL AND A HEAT TREATMENT METHOD THEREOF TO ENSURE HIGH TOUGHNESS AT LOW TEMPERATURE OF -40amp;deg;C AND HIGH STRENGTH AT THE ROOM TEMPERATURE

摘要

PURPOSE: Low-carbon and low-alloy casting steel and a heat treatment method thereof are provided to achieve the tensile strength and impact characteristic required for a marine structure in the deep sea.;CONSTITUTION: Low-carbon and low-alloy casting steel comprises carbon of 0.09~0.11wt.%, silicon of 0.57~0.59wt.%, manganese of 1.1~1.3wt.%, chrome less than 0.21wt.%, sulfur less than 0.02wt.%, phosphorous less than 0.01wt.%, copper less than 0.01wt.%, nickel less than 0.2wt.%, molybdenum less than 0.16wt.%, aluminum less than 0.060wt.%, and the rest iron.;COPYRIGHT KIPO 2010