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对油井管用钢进行了湿H2S环境中4种Cl-浓度应力环试验。结果表明:断裂试样的表面形貌可分为4部分,断口裂纹源、裂纹扩展区、瞬断区和滑移带。油井管用钢的断裂机理符合滑移-溶解-断裂理论。Cr和V在金属表面富集,形成的腐蚀产物膜起到了保护作用。在湿硫化氢环境中腐蚀溶液中Cl-浓度达到0.850 mol/L时,油井管用钢腐蚀最严重。
Four types of Cl-concentration stress rings in wet H2S environment were tested on oil well pipe steel. The results show that the surface morphology of the fracture specimen can be divided into four parts: fracture source, crack propagation zone, instantaneous zone and slip zone. Fracture mechanism of oil well pipe meets the theory of slip-dissolution-fracture. Cr and V enrichment on the metal surface, the formation of the corrosion product film played a protective role. In wet hydrogen sulfide environment corrosion solution Cl- concentration reached 0.850 mol / L, the corrosion of oil well pipe steel is the most serious.