IDENTIFICATION SIGMA PHASE AND CARBIDE IN MATERIAL HP50 IN THE CENTER AREA OF ETHYLENE CRACKING FURNACE AFTER FOUR YEARS OF OPERATION

• Main Author: Aning Sari, Vivian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/56617
• Institution: Institut Teknologi Bandung

Ethylene is an important raw material in the petrochemical industry. Ethylene is produced through a thermal cracking process using a radiant ethylene cracking tube. This study uses HP-50 material from the center of a radiant ethylene cracking tube which operates for four years at a temperature of 700-850?C. The effect of temperature was studied by microstructure observations using metallography and observed using an optical microscope and a scanning electron microscope. The chemical composition contained in the specimens was observed using the OES method. SEM-EDS observations were carried out to ensure the phase formed. ImageJ software is used to measure the depth of carburization and the average grain area of carbide. The rated depth of carburization has an average of 1.31 mm. The average measured carbide grain area inside, center, and outside were 268.85 ?m, 65.41 ?m, and 23.09 ?m, respectively. The results of the hard tests carried out are in harmony with the quantitative carbida grain data. The effect of temperature 700-850?C occurs growth, there is a chromium depletion zone that is clean of carbide, and gradation of carbide grain density is formed.