Mechanical Properties and Corrosion Behaviors of Novel Cr2Ni Low-Alloy Construction Steel

摘要

The novel Cr2Ni low-alloy construction steel with good matched strength and toughness wasdeveloped through a reasonable thermo-mechanical control process (TMCP). Microhardness, impacttoughness and tensile properties of this steel were measured and compared with a traditional X60 steel.The corrosion resistance was determined by immersion tests combined with weight loss method. Theelectrochemical corrosion behaviors were investigated using potentiodynamic sweeps, electrochemicalimpedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results showed that thenovel Cr2Ni steel can achieve much better mechanical properties and corrosion performance than X60steel. Compared with traditional X60 steel, the impact energy (~ 240 J) of Cr2Ni steel increased by onetime approximately. Uniform corrosion characteristic was present to the Cr2Ni steel. As a result of theprotectiveness of the Cr rich film, the novel Cr2Ni steel showed much better corrosion resistance thanX60 steel.