Prevention of solidification cracking of high Si bearing tube for ethylene plant

Decrease of solidification cracking susceptibility in high Si weld metal (1)

Abstract

Though 0.15%C-1.8%Si-25%Cr-38%Ni-1.5%Mo with Si bearing tube is used for ethylene plant, it has the dangerous risk of solidification cracking susceptibility by the micro segregation of Si. Really, its solidification cracking is avoided by obeying the appropriate welding condition, but its mechanism is clarified. Consequently, in the present work, the mechanism of the decrease of solidification cracking susceptibility by the micro segregation of Si was proposed from an metallurgical point of view.