Sample for testing z-direction performance of seamless steel pipe and preparation method thereof

Abstract

The invention discloses a sample for testing the Z-direction performance of a seamless steel pipe and a preparation method thereof, relating to the field of steel testing, comprising the following steps: cutting a metal plate on a seamless steel pipe to be tested as a first sample, providing Two steel plates are used as the first welding plate and the second welding plate, the first welding plate is vertically welded on the top surface of the first sample, and the second welding plate is vertically welded on the bottom surface of the first sample opposite to the first welding plate ; Cut off the metal plate outside the first sample test area to obtain the first sample to be tested, and longitudinally cut several test sections with the same longitudinal length as the first sample to be tested on the first sample to be tested; The section is prepared into a tensile sample test bar, and the tensile sample test bar includes a test bar ring and a first clamping end and a second clamping end welded to two ends of the test bar ring, and the first clamping end, the second clamping end The diameters of the two clamping ends are both larger than the diameter of the ring of the test rod, and the invention can accurately measure the Z-direction performance of the seamless steel pipe.

Description

technical field [0001] The invention relates to the field of steel testing, in particular to a sample for testing the Z-direction performance of a seamless steel pipe and a preparation method thereof. Background technique [0002] With the vigorous development of offshore oil exploration and offshore engineering products, more and more offshore engineering projects will use steel pipe welding materials in the main structure. For example, the main structure stinger of the pipe-laying ship is welded by a large number of large-scale steel pipes. , the pipe-laying ship lays a large number of pipelines on the seabed. When the submarine pipeline is laid in an S-shape, it is necessary to hang a stinger at the stern of the pipe-laying ship to control the curvature of the pipeline during the launching process and prevent the pipeline from being too Yield or rupture caused by large. [0003] The stinger is usually assembled with a large number of steel pipes. During use, the steel pi...

AI Technical Summary

Problems solved by technology

[0005] Since the steel plate is welded into a steel pipe, high temperature treatment and other processes are required, and the structure and performance of the steel plate will change. Therefore, using the Z-direction performance of the steel plate as the Z-direction performance of the steel pipe cannot accurately reflect the Z-direction performance of the steel pipe. At the same time, since the seamless steel pipe is prepared by piercing the tube blank, reheating the rolled steel pipe, sizing, heat treatment, straightening and finishing the finished pipe, the structure of the seamless steel pipe is completely different from that of the seamed steel pipe, and the steel pipe is processed by heating, etc. After the process treatment, its performance is significantly different from that of the tube blank. It is difficult to determine the Z-direction performance of the seamless steel pipe only through the Z-direction performance of the tube blank, and it is difficult to choose a suitable seamless steel pipe.

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