Study on Influence of Thermal Expansion of the Solid Zinc in Hot Dip Galvanizing Bath by Elastic-plastic Analysis

-Stress of the Corner of Hot Dip Galvanizing Bath at Start-up Operation (2nd Report) -

Abstract

At start-up operation of hot dip galvanizing baths to galvanize steel products, several leakage accidents of liquid zinc due to the damage in the vicinity of welded parts between side and bottom plates have been reported. Generally, liquid zinc is transferred to a new bath which has been heated adequately. In some of the accidents, however, it was found that transferred liquid zinc solidified in the bath heated inadequately. The purpose of this paper is to obtain stresses of the bath which are generated by thermal expansion of solid zinc inside the bath due to continuous heating in order to investigate the cause of above damages. Basing on the distribution of temperature on various parts of the bath obtained by unsteady thermal conduction analysis, stresses are calculated by elastic-plastic analysis with taking effects of strain rate and temperature for solid zinc into account.