Method for acquiring stress parameters of steel plate for pipe manufacturing and steel plate selection method

Abstract

The invention belongs to the technical field of steel pipe manufacturing, relates to a method for acquiring stress parameters of a steel plate for pipe manufacturing and a steel plate selection method, and aims to solve the problem that a steel pipe manufactured from a steel plate selected based on a stress standard value does not meet requirements. The method for acquiring the stress parameters of the steel plate for pipe manufacturing comprises the steps of: acquiring average strain of a to-be-manufactured steel pipe; selecting N steel plate samples to obtain M groups of strain values and Nsteel plate stress values corresponding to each group of same strain values; selecting N steel plate samples to be manufactured into N steel pipe samples, and acquiring a yield strength value of the steel pipe samples when the strain value is delta epsilon; performing straight line fitting on the steel plate stress value and the yield strength value to obtain a steel plate strain value corresponding to the maximum goodness of fit to serve as a characterization parameter of the steel plate stress value; acquiring a range of the stress value Rtx corresponding to the corrected characterization parameter based on the N difference values of the steel pipe actual measurement Rt delta x and the steel pipe fitting Rt delta x, and enabling the steel pipe manufactured from the steel plate selected through utilizing the stress parameter to meet the technological requirements.

Description

technical field [0001] The invention belongs to the technical field of steel pipe preparation, and in particular relates to a method for obtaining stress parameters of a steel plate for pipe making and a method for selecting a steel plate. Background technique [0002] As an efficient and economical transportation method, pipeline is the main way of long-distance transportation of oil and gas. At present, my country has built more than 120,000 kilometers of oil and gas pipelines such as the West-East Gas Pipeline, the Second / Third / Fourth West-East Gas Pipeline, the China-Russia Crude Oil Pipeline, the Central Asia Pipeline, and the China-Myanmar Pipeline, but they still cannot meet my country's rapid demand for oil and gas. The construction of oil and gas pipelines is still in the stage of rapid development. The raw material of LSAW pipes for oil and gas pipelines is hot-rolled wide and thick plates. The main processes of pipe production include pre-bending, forming, welding...

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem in the prior art that steel pipes made from steel plates selected based on stress standard values ​​do not meet the yield strength requirements, the present invention provides a method for obtaining stress parameters of steel plates for pipe making , steel plate selection method

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