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Influencing factors of 1Cr13 SSCC for oil gas wellhead

机译：油气井口1CR13 SSCC的影响因素

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With the exploration of oil-gas field developing, more and more oil-gas well contain H_2S, hydrogen sulfide stress corrosion has serious effect on production and restrict oil field development. With the applications of 1Cr13 steel in oil & gas wellhead, it is urgent to research hydrogen sulfide stress corrosion cracking (SSCC) properties in high-strength under the simulation condition of production. The tensile test under constant load and slow strain rate test (SSRT) were adopted to analyze the behaviors of 1Cr13 steel with orthogonal test under saturated H_2S solution which included carbon dioxide under a partial pressure and its sample fracture was observed with SEM (Scanning Electron Microscope). Constant load tensile test is one of the first recognized by NACE to assess the performance of metallic materials against SSC approach under tensile stress in the aqueous solution which was in low pH value and H_2S was saturated. Through the research above the mechanism of stress corrosion and the environmental factors that influence stress corrosion were investigated. The experimental results shown that the effects of environmental factors on SCC (Stress Corrosion Cracking) sensitivity of materials are in the following order: temperature effect > solution pH effect > chloride ion concentration effect, and 1Cr13 material has a better corrosion resistance for H_2S and CO_2 conditions under a certain stress so it can be proposed as the material of value for oil & gas wellhead. Through SEM it can be seen that the fracture is belonged to brittle fracture. The lattice bonding force is destroyed by hydrogen into the material that gathered in the certain crystal face and the material transform from plastic to brittleness, the material is failed, and SCC occurred.
机译：随着石油天然气场的探索，越来越多的油气含量含量较好，硫化氢应力腐蚀对生产和限制油田发育具有严重影响。随着1Cr13钢在油气井口中的应用，在生产的仿真条件下高强度研究硫化氢应力腐蚀裂纹（SSCC）性能迫切需要。采用恒定载荷和慢速应变速率试验（SSRT）下的拉伸试验分析1Cr13钢在饱和H_2S溶液下具有正交试验，其中包括在分压下的二氧化碳，并用SEM观察其样品骨折（扫描电子显微镜）。恒定载荷拉伸试验是NACE首次识别的RINE，以评估金属材料对SSC方法的性能，在低pH值中的水溶液中的拉伸应力下，H_2S饱和。通过高于高于应力腐蚀的机制和影响应力腐蚀的环境因素。实验结果表明，环境因素对SCC（应力腐蚀裂解）材料的敏感性的影响是以下顺序：温度效应>溶液pH效应>氯离子浓度效应，1Cr13材料对H_2S和CO_2具有更好的耐腐蚀性条件下的一定应力，因此可以提出作为油气井口的价值材料。通过SEM可以看出，骨折属于脆性骨折。晶格键合力通过氢气破坏，进入聚集在某些晶体面上的材料和从塑料转换为脆性的材料变换，材料发生故障，并且SCC发生。

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