Crack Failure Analysis of Stainless Steel Seamless Pipe

Abstract

Stainless steel pipe is widely used in machinery manufacturing industry, mainly used as steam, liquefied natural gas, natural gas, various petroleum products transmission pipeline. China is the largest consumer of stainless steel tube in the world, and in recent years the total consumption of stainless steel accounted for more than 20% of the total consumption in the world. Stainless steel pipe has good mechanical properties and good corrosion resistance, so it is widely used in the ocean engineering and shipbuilding industry, which is widely used in offshore oil and gas fields, deep water pumps, offshore drilling platforms, seabed mining devices, warships and other aspects. In this paper, the leakage of stainless steel seamless steel pipe used by a company is studied to discuss the failure behavior of stainless steel seamless steel pipe. The microstructure analysis shows that the fracture surface has the characteristics of stress corrosion crack. Chemical composition analysis, chemical composition of the sample GB/T 13296-2013 “Seamless Stainless Steel Tubes for Boilers and Heat exchangers” requirements for S31708 stainless steel; SEM and EDS detection: the corrosion products of seamless steel pipe fracture and the scale composition in the tube were detected. The corrosive medium Cl was found in the scale composition detection, and no obvious corrosive medium was found in the corrosion products of the fracture surface.