Vývoj zušlechtění ocelí C110 a T95 dle API 5CT

Abstract

These Diploma thesis deals with the development of the quenching and tempering of the steels C110 and T95 made of the steel with the designation C95/110. The aim is to achieve the mechanical properties required by the API 5CT standard by an appropriate heat treatment mode. It is therefore the achievement of tensile strength, yield strength, elongation at fracture and hardness values. This development was carried out on the Válcovna trub-TŘINECKÉ ŽELEZÁRNY a.s., namely the Large Mannesmann centre. The subject of the investigation were tubes with dimensions of 244.48 x 11.05 mm and 269.88 x 21.06 mm in two different heats in each dimension which were fully conform to the chemical composition given in the abovementioned implementing standard. In total, 14 pieces of tubes were produced for this research. To evaluate the microstructure, selected samples were taken from the tubes both after quenching and after tempering for both steel grades.