Method for detecting Bauschinger effect value of steel plate for welded pipe

Abstract

The invention provides a method for detecting a Bauschinger effect value of a steel plate for a welded pipe, and belongs to the technical field of steel performance detection. The method comprises the following steps: cutting a detection sample from a steel plate for producing the spiral seam submerged arc welding steel pipe; cutting a first sample and a second sample from the flattened detection sample; the first sample is bent at least twice in a three-point bending mode, so that a cylindrical surface with the same radius as the spiral seam submerged arc welding steel pipe is formed in a target area on the first sample; after the first sample is flattened, a first tensile sample is cut from the target area on the first sample; cutting a second tensile sample from the second sample; and performing a tensile test on the first tensile sample and the second tensile sample, and determining the Bauschinger effect value of the steel plate according to a tensile test result. According to the scheme, the cost for detecting the Bauschinger effect value can be reduced.

Description

technical field [0001] The invention relates to the technical field of steel performance detection, in particular to a method for detecting the Bauschinger effect value of steel plates for welded pipes. Background technique [0002] Spiral seam submerged arc welded steel pipe is a metal pipe with spiral seam welded by submerged arc welding process, which is usually used as a transportation pipeline for fluids such as oil and natural gas. The Bauschinger effect refers to the phenomenon that the yield strength of a metal material is reduced compared to the original state when it is deformed in the opposite direction after being plastically deformed in one direction. Since the steel plate needs to be bent when producing the spiral seam submerged arc welded steel pipe, and the steel plate will be plastically deformed when it is bent, it is necessary to detect the Bauschinger effect value of the steel plate before producing the spiral seam submerged arc welded steel pipe to deter...

AI Technical Summary

Problems solved by technology

[0004] When the steel plate is bent by the large-scale unit on the production line, the large-scale unit can only bend the larger-sized steel plate, but cannot bend the smaller-sized steel plate, but the detection of the Bauschinger effect value only needs to be used Smaller size steel plate specimens, so more steel plates will be wasted in the process of testing the Bauschinger effect value, resulting in higher cost of testing the Bauschinger effect value

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