Steel pipe longitudinal strength quality control method based on pipeline circumferential weld strength matching

Abstract

The invention discloses a steel pipe longitudinal strength quality control method based on pipeline circumferential weld strength matching. The method comprises the steps of determining the strength level of a steel pipe, collecting actual weld metal strength data of an equal-strength welding material, calculating the weld metal strength normal distribution mean value and standard deviation, calculating the minimum strength of weld metal, determining the steel pipe longitudinal strength mean value, determining the minimum longitudinal strength of the steel pipe, calculating the steel pipe longitudinal strength normal distribution standard deviation, calculating the maximum longitudinal strength of the steel pipe, determining the control range of the longitudinal strength of the steel pipe,and developing and revising a steel plate technical condition and quality control scheme. By means of the method, the longitudinal strength of the steel pipe is controlled from the source, so that the circumferential weld strength of a pipeline is matched to be equal, and the situation that the actual circumferential weld strength is lower than the longitudinal strength of the steel pipe due to the fact that a welding process and a welding material are selected by adopting standard minimum circumferential tensile strength of the steel pipe is avoided; and therefore, the occurrence of pipelinecircumferential weld fracture accidents is greatly reduced, and the safe operation of the pipeline is guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of pipe girth weld welding and steel pipe manufacturing, and relates to a steel pipe longitudinal strength quality control method based on pipe girth weld strength matching. Background technique [0002] As the demand for energy continues to increase, large-scale construction of oil and gas pipelines has begun worldwide. However, long-distance oil and gas pipelines often pass through complex regions such as deserts, plains, waters, mountains, and densely populated cities and towns. Their safe and reliable operation is of great significance to the society and the natural environment, and failures will lead to catastrophic accidents. Statistics show that most of the failure accidents of long-distance pipelines at home and abroad are represented by the fracture of the circumferential weld, and the strength matching of the circumferential weld plays a vital role in the failure of the pipeline. [0003] At present, the...

AI Technical Summary

Problems solved by technology

Moreover, the pipeline design in most countries still adopts more stress design, and the design documents and manufacturing standards or technical conditions only stipulate the circumferential strength of the steel pipe, and there is no specific control requirement for the longitudinal strength of the steel pipe, nor is it based on the pipe girth weld Strength matching requirements to control the longitudinal strength method of steel pipes

If the circumferential strength of the steel pipe body is still specified in the standard to select the welding material and process, the problem of strength matching of the girth weld joint will not be solved at all, and it is very likely to cause the failure of the girth weld of the pipeline, resulting in catastrophic accidents

Images