Titanium alloy hardness is not strong, pure titanium hardness is HV280-300, alloy hardness is HV280-340, steel material strength and hardness have a certain relationship, but titanium alloy hardness and strength have no relationship. Titanium alloy isn't tough, it's really strong. Popular science has two concepts: strength and hardness, strength refers to the ability of materials to resist deformation and fracture, hardness refers to the ability of materials to resist other materials into their own. Titanium or Titanium Seamless Tube hardness is considerably lower than the general hardened steel, after nitriding treatment will considerably improve, but still not as tough as silicon carbide, boron carbide and other materials. Speaking of the hardest material, Tian Yongjun from Yanshan University, an academician of the Chinese Academy of Sciences, was awarded the prize in 2017. The hardness of native diamond made by Tian's team is twice that of natural diamond, making it the hardest material known to date. Titanium alloys are characterized by corrosion resistance, high strength and low density. Titanium alloy in seawater, a year of corrosion is a few microns. Ten times higher than 306L stainless steel. Titanium alloy tensile strength easily greater than 800MPa, some aviation titanium alloy general 1000MPa. Because of the tiny weight, thus the same structural strength, much lighter weight, making aircraft, submarine is highly suitable. The surface hardness is still HV280-340. In order to improve the wear resistance of titanium alloy, there are numerous research and technological applications. The application field of titanium alloy is continuously expanding. At present, the titanium hydraulic system with wear-resistant coating has been a mature application. The application of titanium ball valve piping system is also gradually expanding.