The Effect of Heat Treatment on Corrosion Behavior of Low-Ni alloy Steels in CO2 Corrosion

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• 作者：WANG Hong-yanBAI Zhen-quan
• 会议时间：2014-05-01
• 关键词：Low-Ni-alloy steel ; Heat treatment ; CO2 corrosion ; Corrosion scale ; XRD
• 作者单位：The Key laboratory for mechanical and Environmental Behaviromental Behavior of Tubular Goods,CNPC,Xi'an 710065,P,R.China
• 母体文献：2014油气井管柱与管材国际会议论文集
• 会议名称：2014油气井管柱与管材国际会议
• 会议地点：西安
• 主办单位：中国石油学会
• 语种：chi

摘要

The microstructures and mechanical properties (tension strength Rm,yield strength Rt0.5 and impact energy Akv)of the low-Ni alloy steels 08Ni, 12CrNi and 20CrNi with and without heat treatment were measured and analyzed.The results indicate that the mechanical properties of the lowNi alloy steels with heat treatment are superior compared to other test materials,in the sequence as follows: (20CrNi) > (12CrNi) > (08Ni) >20CrNi > 12CrNi > X60 > 08Ni > 16Mn.The weight loss method was used to test the corrosion rates of the test materials exposed to a simulated oilfield environment for 168 h at 90℃ with the CO2 partial pressure and total pressure 2 MPa and 10 MPa respectively.The systematical characterization with SEM and X-ray diffraction (XRD) displayed the different micro-morphology of corrosion scale formed on surface of the test materials with FeCO3 as the only detected composition of corrosion product.The corrosion behavior of the low-Ni alloy steels with heat treatment showed higher corrosion resistance than other test materials, mainly resulted from the different microstructures of the matrix, the characteristic of corrosion scale and the composition of elements.