Analysis of Tensile Properties of N80Q Steel and 80SH Steel

Abstract:

During heavy oil production, the performance of casing varies with temperature in the service environment. The tensile test of N80Q Steel and 80SH Steel were carried out to evaluate the mechanical properties during the service. The results indicated that the grain size of 80SH steel was relatively uniform and the grain boundary was relatively obvious compared with N80Q steel. A qualitative analysis was performance by relating the tensile properties with different temperature. The results showed that the yield strength, the tensile strength and elongation of N80Q and 80SH steels decreased with increasing temperature, but the degree of decline was limited. The observation of the tensile fracture revealed that the characteristics of the radiation zone of N80Q steel were obvious compared with 80SH steel at 20°C.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 610-615
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.610
• Online since: May 2020
• Authors: Yang Chen, Hang Wang, Shang Yu Yang, Wen Lan Wei, She Ji Luo, Li Hong Han*
• Keywords: Casing Steel, Fatigue Performance, Tensile Properties, Thermal Recovery Well

References

[1] Li Pingquan. Mechanical and environmental service conditions and their requirements for oil casings. oil casing standard research, oil casing failure analysis and typical cases, (1) [J]. Steel Pipe, 2006 (04): 57-60.

[2] Liu Qing. Analysis of casing damage mechanism[J]. Petrochemical Technology, 2016, 23 (12): 47.

[3] Zhang Yonggui. Theoretical and experimental study on casing strength of steam injection thermal recovery wells. PhD thesis. Yanshan University, (2008).

[4] Zhang Zheng. Research progress on casing damage of heavy oil thermal recovery wells. Technology & Development of Chemical Industry, 2018, 47 (08): 34-40.

[5] Bao Wenqiang. Research on the performance of N80 steel treated by QPQ technology PhD thesis. Xihua University, (2016).

[6] Wei Wenbiao,Han Lihong,Wang Jianguo,Wang Hang,Feng Yaorong.High. Temperature Mechanical Properties of 10Cr3Mo Steel and N80 Steel[J]. Heat Treatment of Metals,2016,41(02):23-27.

[7] Wei Wenlan, Han Lihong, Wang Jianguo, Wang Hang, FengYaorong. High temperature mechanical properties of 10Cr3Mo steel and N80 steel[J]. Heat Treatment of Metals,2016,41(02):23-27.

[8] Tian Q C,Dong X M,Hong J.Thermal mechanical behavior and microstructure characteristic of microalloyed CrMo steel under cross deformation [J]. Materilas Science and Engineering A,2010,527(18-19):4702-4707.

DOI: 10.1016/j.msea.2010.04.007

[9] Wu Yi. Study on the influence mechanism of V/Ti microalloying on the microstructure and mechanical properties of medium carbon steel PhD thesis. Harbin Institute of Technology, (2010).

[10] Han Liangliang, Zhang Ying, Jing Lin, Wei Huacheng, Yan Yaozhou. Tensile Properties and Fracture Morphology of D1 Wheel Steel at Different Strain Rates[J]. Materials for Mechanical Engineering,2016,40(11):16-21.

[11] Bao Wenqiang, Luo Defu, Zhang Lei. Mechanical properties of N80 steel tubing after QPQ treatment[J]. Heat Treatment of Metals, 2016, 41(05): 57-61.