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为了研究油气管道钢级普遍提高对B31G标准的影响规律,从屈强比、流变应力和缺陷深度比等因素出发,系统地分析了管线钢屈强比变化对流变应力取值的影响,并在对不同版本的B31G标准进行对比的基础上,详细分析了缺陷深度比变化与管道钢级提高所造成的B31G标准计算结果保守性和集中性的变化。研究结果表明:随着管道钢级提高,B31G标准计算结果的保守性逐渐减小,并向冒进发展,计算结果的集中性也明显变差,由此导致了B31G标准对高钢级管道适用性越来越差,通过对流变应力取值重新定义能在一定程度上改善B31G计算结果的保守性,但难以从根本上解决集中性差导致的适用性问题。
In order to study the general rule of increasing impact on the B31G standard of oil and gas pipelines, this paper systematically analyzed the influence of the change of yield ratio of pipeline steel on the value of convective stress based on factors such as yield ratio, flow stress and defect depth ratio. Based on the comparison of different versions of B31G standard, the changes of conservation and concentration of B31G standard calculation results caused by the change of defect depth ratio and the increase of steel grade were analyzed in detail. The results show that with the increase of pipeline steel grade, the conservativeness of B31G standard calculation results decreases gradually and leads to aggressive development. The concentration of calculation results also obviously deteriorates, which leads to the applicability of B31G standard to high grade steel pipe The worse and worse, the redefinition of the value of convective stress can improve the conservativeness of B31G calculation to a certain extent, but it is difficult to solve the problem of applicability caused by poor concentration fundamentally.