The cognitive level is raised by results of experiment and analysis for mechanical properties of casing connection, and the useful data are provided for the further research in theory.
实验和分析结论提高了全面认识套管接头力学性能的水平，而且对从理论上进一步深入研究提供了可靠的数据。
ERW casing is applicated widely in oil and gas industry and substituted for seamless tubing for its high precision, excellent properties, easy controlling of quality and low cost etc.
ERW套管和无缝套管相比，具有尺寸精度高、焊缝韧性好、抗挤压性能好、质量易于控制以及成本低等优势。
Finally, the casing defects are classified by using the properties of grayscale function, and the lifetime of casing is forecasted.
最后，利用灰度函数的性质，给出套管缺陷分类的新方法，并对其进行分类和使用寿命预测分析。
For mandatory and optional arguments, the corresponding properties and constructor parameters should use the same name but different casing.
对于强制和选择性引数而言，对应的属性和建构函式参数应使用相同的名称，但大小写不同。
Influence by the factors involved in the heat treatment process on the mechanical properties of the oil casing is analyzed by means of relevant orthogonal test.
通过正交试验，研究了热处理工艺因素对石油套管力学性能的影响。
Influence by the factors involved in the heat treatment process on the mechanical properties of the oil casing is analyzed by means of relevant orthogonal test.
通过正交试验，研究了热处理工艺因素对石油套管力学性能的影响。
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