Detection Content

Detection Purpose: Testing material's stress corrosion cracking resistance

Detection range: Oil pipeline, boiler, liquefied gas tank and other pressure vessels, metal and other products

SCC: stress corrosion cracking. In the presence of water and H2S, a kind of metal cracking related to the anode process and tensile stress of local corrosion is the metal fracture phenomenon caused by the synergistic action of stress and corrosion medium (see metal corrosion). It has three main characteristics: ① stress corrosion fracture is a function of time. The greater the tensile stress is, the shorter the time required for fracture is; the stress required for fracture is generally lower than the yield strength of the material. This kind of stress includes the stress produced by external loading, residual stress, wedge stress of corrosion products, etc. ② the corrosion medium is specific, and stress corrosion fracture will occur only under the combination of some metals and media. If there is no stress, the corrosion rate of metal in its specific corrosion medium is small. ③ the fracture velocity is between pure corrosion and pure mechanical failure, and the fracture is generally brittle.