Optimization of Reheating Temperature to Reduce Surface Crack in Wire Rod Carbon Steel Induced by Residual Copper

摘要

Surface crack formation of steel induced by residual copper(Cu) is investigated using gleeble tester in the laboratory and finding out the optimum reheating temperature in the wire rod mill to reduce the surface defect. Deformation test with various reheating temperature and time reveal that the crack number increases at the specified condition. Scale formation and behavior of Cu layer are observed on the surface and indicated that the defect number is the largest at the 1000℃ of reheating temperature and being reduced by increasing the reheating temperature, but according as the reheating temperature time is increased, the defect depth become far deeper. On the base of the observation, experimentation is done on the real working site with carbon steel induced by 0.10% residual copper and find out the optimum reheating furnace temperature and the defect number is reduce as much as one of 10th.