PENGARUH TEMPERATUR DAN HOLDING TIME DALAM PROSES TEMPERING TERHADAP SIFAT MEKANIK PIPA LOW CARBON STEEL LOW ALLOY GRADE X65Q

Abstract

Steel is a metal alloy consisting of iron as the main element and carbon as the main alloying element.. Heat treatment is a process to change the microstructure through a heating process and controlling the cooling rate with or without changing the chemical composition of the metal in order to produce the desired mechanical properties. This study aims to determine the effect of temperature and holding time of the quenching-tempering process on the mechanical properties of low carbon steel low alloy grade X65Q pipe. The tempering process is carried out with a temperature variation of 660 o C holding time 50 minutes and 580 o C holding time 53 minutes after the previous quenching. To figure out the mechanical properties of the specimen, a tensile test was carried out. From the results of the study, it is known that the temperature and holding time of the tempering process affect the mechanical properties of the X65Q low carbon steel low alloy grade pipe where by lowering the temperature by 80 o C it can increase the yield strength by 7.419 psi and tensile strength by 6.095 psi. From these results it can be concluded that the correlation between temperature and specimen hardness is inversely proportional while the correlation between holding time and specimen ductility is directly proportional.