“PU—1”低合金高强度抗H2S应力腐蚀钻材钢的研究

研制的“ＰＵ－１”低合金高强度抗Ｈ２Ｓ应力腐蚀钻材新钢种,具有良好的综合力学、抗Ｈ２Ｓ应力腐蚀和焊接性能,应用于结构构件方面是可行的,且有显著的经济和社会效益。     

抗H2S应力腐蚀钻材用新钢种“pu—1”可焊性能的研究

对新研制的低合金高强度抗Ｈ２Ｓ腐蚀钻材用钢种“ｐｕ－１”进行了可焊性能试验研究，结果表明：“ｐｕ－１”具有较好的可焊性能，在此基础上开发出抗Ｈ２Ｓ腐蚀结构钢种“ｐｕ－１”。     

高韧性抗H2S腐蚀管线钢试验研究

Experimental Study of High Toughness H2 SCorrosionResistant Pipeline SteelMo Demin( Science and Technology Departmentof Wuyang lron and Steel Co.Ltd)　　本研究的目的在于研制开发抗酸气腐蚀最低强度指标是 70 ksi(485MPa)的高韧性管线钢。降低 50℃左右。由于热轧、控制轧制的钢中均含大量的自由氮 ,因此要求母材上氮含量尽可能图 1　不同强化机理对转变温度的作用适 ,均匀分布的 ,这两者都是通过降低 Ti N形成的溶解性 ,见图 5。图 5表明 :1 1 50℃下碳含量为0.1 0 % (未加入 Ti)的传统管线钢中钢中铌的相对溶　　…     

低铬抗硫套管的H2S/CO2腐蚀行为研究

通过高温高压及H2S应力腐蚀开裂(SSC)实验,采用SEM、EDS、XRD和TEM技术,研究3Cr110S在模拟环境中的H2S/CO2腐蚀行为。结果表明:在模拟H2S/CO2高温高压腐蚀环境中,H2S腐蚀占主导作用,3Cr110S的均匀腐蚀速率为0.1272 mm/a,局部腐蚀轻微,试样表面腐蚀产物为FeS;在施加应力为72%、80%的最低屈服强度时,3Cr110S试样均未发生应力腐蚀开裂,具有良好的抗SSC性能;3Cr110S回火索氏体组织的条束之间位相差大,铬元素在晶界及晶内以粒状碳化物析出、位错纠结、弥散分布碳化物的位错定扎对SSC裂纹扩展起着良好的阻碍作用。     

BT80SS抗H2S腐蚀石油套管的研制

根据化学元素对H2S应力腐蚀的影响,选用C,Mn,Cr和Mo为合金元素,控制S和P等有害元素的含量,同时加入RE;根据钢管的组织对抗H2S应力腐蚀的影响,采用淬火后高温回火的热处理制度,生产出了具有自主知识产权的抗H2S套管,该产品具有良好的耐H2S腐蚀性能。     

低合金高强度钢开发与研究的新进展

介绍了低合金高强度钢开发与研究的新进展，并对当前国内低合金高强度钢生产存在的总理２进行了分析，同时对低合金高强度钢的市场需求进行了预测。     

关于低合金高强度钢的研究与开发

本文阐述了低合金高强度钢开发研究的新进展,并对当前国内该钢种生产存在的问题进行了分析。在此基础上对今后低合金高强度钢的市场需求进行了预测。     

CO2分压对油管钢CO2/H2S腐蚀的影响

采用高温高压釜、失重法和扫描电镜，对不同CO2分压(310．2642、930．7926、1551．3210、2171．8494kPa)条件下油管钢N80和P110的CO2／H2S腐蚀进行了研究。结果表明，随着CO2分压的升高，两种钢的CO2／H2S腐蚀速率均单调增加；除了CO2分压极低的情况以外，P110钢的腐蚀速率总是大于N80钢。     

H2S对低碳钢在焦炉煤气中腐蚀行为的影响

研究了Ｈ２Ｓ对低碳钢在焦炉煤气中腐蚀动力学的影响，证实在Ｈ２Ｓ含量为０．１５ｇ／ｍ＾３时电极过程的控制步骤出现明显的转化，「Ｈ２Ｓ」〈０．１５ｇ／ｍ＾３为阴极过程控制，「Ｈ２Ｓ」〉０．１５ｇ／ｍ＾３为阳极过程控制，用直接证据证明在高Ｈ２Ｓ含量的煤气中低碳钢能够在表面形成和密的保护膜，并且从理论上解释了这些现象。     

“pu—1”抗H2S腐蚀钻材钢CCT曲线的测定及应用

利用Ｆｏｒｍａｓｔｏｒ－Ｆ全自动相变测定仪，测定抗Ｈ２Ｓ腐蚀钻材“ｐｕ－１”钢，获得此种钢的ＣＣＴ曲线；证明依据该曲线所制定钢的热处理工艺，所获金相显微结构组织的抗Ｈ２Ｓ腐蚀性能最佳。     

Corrosion Behavior of 110S Tube Steel in Environments of High H2S and CO2 Content

 The corrosion behavior of the 110S tube steel in the environments of high H2S and CO2 content was investigated by using a high-temperature and high-pressure autoclave, and the corrosion products were characterized by scanning electron microscopy and X-ray diffraction technique. The results showed that all of the corrosion products under the test conditions mainly consisted of different types of iron sulfides such as pyrrhotite of Fe0. 95S, mackinawite of FeS0. 9, Fe0. 985S and FeS, and the absence of iron carbonate in the corrosion scales indicated that the corrosion process was controlled by H2S corrosion. The corrosion rate of the 110S steel decreased firstly and then increased with the rising of temperature. The minimum corrosion rate occurred at 110 ℃. When the H2S partial pressure PH2S below 9 MPa, the corrosion rate declined with the increase of PH2S. While over 9 MPa, a higher PH2S resulted in a faster corrosion process. With the increasing of the CO2 partial pressure, the corrosion rate had an increasing trend. The morphologies of the corrosion scales had a good accordance with the corrosion rates.     

超级13Cr在H2S和CO2共存环境下的腐蚀行为影响研究

对CO2和H2S共存环境中95 ksi钢级超级13Cr钢的腐蚀行为进行了研究,发现常温条件下H2S和CO2共存环境中,无论是采用恒载荷的方法还是四点弯曲的方法,都在试样的表面出现了局部腐蚀,而在高温条件下未发生点蚀和应力腐蚀现象。分析结果表明,95 ksi钢级的超级马氏体不锈钢在常温H2S和CO2共存环境中出现的局部腐蚀主要是因为夹杂物在应力集中和酸性溶液的作用下形成点蚀,并沿着相同应力水平的区域扩展,局部腐蚀增加了应力腐蚀开裂的敏感性。     

Influence of Chromium on Mechanical Properties and CO2/H2S Corrosion Behavior of P110 Grade Tube Steel

Four kinds of P110 grade tube steels containing different chromium contents were designed to probe the in- fluence of Cr on the properties of tube steel. The microstrueture, mechanical properties and corrosion behavior of the four kinds of P110 grade tube steels were studied deeply and thoroughly. The analysis of the mechanical properties indicated that tensile strength and yield strength of the steel plates were improved, while transverse and longitudinal impact energy and elongation first increased and then decreased when Cr content rose. The impact energy and elonga tion reached the peak when Cr content was 1 ~. Cr precipitates were found only in 3 ~ Cr steel, with （Nb, Ti）（C, N） or Nb（C,N） as the core of precipitation and then grew up. The corrosion experiments demonstrated that the scales on the four steels had a two layer structure under the corrosion of CO2 and H2 S. The outer layer was mainly com- posed of FeS or FeS1 x and the inner layer consisted of FeCOa and Cr compounds. Cr was rich in the inner layer and the Cr content of the inner layer increased with the Cr content in matrix. The enriched Cr enhanced the compactness of the scales, further hindering the diffusion of ions from liquid to the surface of steel, thus reducing corrosion rate.