STUDY OF EFFECT OF TENSILE STRESS IN STRESS CORROSION CRACKING TESTING ON TUBE MATERIAL C44300 USING C-RING METHOD

• Main Author: Marsandiya Akbar, Haris
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49997
• Institution: Institut Teknologi Bandung

Condenser is an important component of heat exchanger which has been widely used in the process industry. This component has important function in order to maintain efficiency level of energy in particular industrial process. Tube is one of the most substantial component in condenser system, which defined as a small pipe inserted inside the condenser. Tube serves as an intermediary media for two or more flowing fluids inside and outside tube of in order to achieve energy stability by exchange the heat from each fluid. One of the suitable material for condenser tube is C44300, also known as admiralty brass. This material has high thermal conductivity and good corrosion resistance against humid environments. However, brass also found susceptible to the presence of ammonia which caused stress corrosion phenomena if the component has accompanied by working or internal stresses in particular time. To determine the effect of C44300 stress corrosion phenomenon caused by ammonia vapor, a study of stress corrosion was conducted on C44300 tube at variant tensile stresses level: 10%, 40%, and 80% of yield strength within 1 M vapor ammonia for 5 days using c-ring method. Each tensile stress level has 2 specimens. In this study, 2 specimens with 80% yield strength and 1 specimen at 40% yield strength were failed and other specimens were found cracked which creeping up from the subjected side which loaded by tensile stress. Type of crack which occurred is transgranular. In addition, there is an increasing trend of change in specimen mass after being tested, in accordance with increasing of tensile stress level.