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Rolling flattening method for strip-shaped transverse tensile sample of steel pipe

A transverse tensile and slat-like technology, which is applied to the rolling flattening of steel pipe slat-shaped transverse tensile specimens, can solve problems such as yield strength reduction, achieve stable yield strength, and avoid inaccurate overpressure parameters.

Active Publication Date: 2022-06-07
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for rolling flattening of a strip-shaped transverse tensile sample of a steel pipe, which solves the problem that the current flattening method of a strip-shaped transverse tensile specimen of a steel pipe leads to a decrease in yield strength. , The standard rolling flattening method reasonably controls the Banschinger effect, so that the test results of the transverse yield strength of the steel pipe sample are stable, reliable and comparable, avoiding misjudgment of product quality and ensuring the safety and reliability of pipeline operation, which is of great significance

Method used

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  • Rolling flattening method for strip-shaped transverse tensile sample of steel pipe
  • Rolling flattening method for strip-shaped transverse tensile sample of steel pipe
  • Rolling flattening method for strip-shaped transverse tensile sample of steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The transverse yield strength test of Φ508×22mm X70 straight welded steel pipe is carried out as follows.

[0021] 1) According to the requirements of relevant standards, cut the raw material of the strip-shaped transverse tensile sample 3 at the position of 90° from the welding seam between the steel pipe, the arc length is about 440mm, and the width is 100mm, such as figure 1 shown. Because it is flame cutting, the effect of edge heat input on the final specimen is considered.

[0022] 2) Put the right end of the strip-shaped sample 3 between the upper pressing roller 2 and the lower supporting roller 1, such as figure 2 shown. The upper pressing roller 2 consists of two round rollers with a diameter of 140mm, which can move up and down. The lower support roller 1 is a round roller with a diameter of 400mm that rotates actively. Move the upper pressing roller 2 down slowly until the upper and lower surfaces of the strip-shaped sample 3 are in contact with the upp...

Embodiment 2

[0032] The transverse yield strength test is carried out on the Φ609×18mmX65 straight welded steel pipe of the shale gas well, which is realized as follows.

[0033] 1) According to the requirements of relevant standards, cut the raw material of the strip-shaped transverse tensile sample 3 at the position of 90° from the welding seam between the steel pipe, the arc length is about 440mm, and the width is 100mm, such as figure 1 shown. Because it is flame cutting, the effect of edge heat input on the final specimen is considered.

[0034] 2) Put the right end of the strip-shaped sample 3 between the upper pressing roller 2 and the lower supporting roller 1, such as figure 2 shown. The upper pressing roller 2 consists of two round rollers with a diameter of 140mm, which can move up and down. The lower support roller 1 is a round roller with a diameter of 500mm that rotates actively. Move the upper pressing roller 2 down slowly until the upper and lower surfaces of the strip...

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Abstract

The invention provides a rolling flattening method for a strip-shaped transverse tensile sample of a steel pipe, which solves the problem that the yield strength of the strip-shaped transverse tensile sample is reduced by the existing flattening method, and reasonably controls the Banschinger effect through a unified and standard rolling flattening method, so that the transverse yield strength test result of the steel pipe sample is stable, reliable and comparable. The method comprises the steps that a lath-shaped transverse tensile sample with the arc length of 2a + 4 t is cut on a steel pipe, 2a is larger than or equal to 350 mm, and t is the thickness of the sample; the upper pressing roller is composed of two round rollers with the axis distance of 1, and the lower supporting roller is a driving rotating round roller. Putting the right end of the sample between an upper compression roller and a lower support roller, and moving the upper compression roller and the sample downwards until the lower surface of the sample is in contact with the lower support roller; the pressing amount is (D-t) / 2-((D-t) 2 / 4-l2 / 4) 1 / 2 + l2 / (6t (E / sigma t-1)), and D is the outer diameter of the steel pipe; e is an elastic modulus; sigma t is the rated tensile strength of the material; rotating the lower support roller to enable the sample to move rightwards, and flattening the rest part of the sample; moving the upper compression roller upwards, taking out the sample, and cutting off certain lengths at two ends to obtain a final sample.

Description

technical field [0001] The invention relates to the technical field of flattening and flattening methods for arc-shaped samples. Background technique [0002] Oil and gas pipelines are the arteries of energy. Preventing plastic deformation of pipeline steel pipes during operation is the basic criterion for pipeline design. The principal stress of the pipeline is the hoop direction, and the hoop yield strength is the most important indicator of the pipeline design. The hoop yield strength of steel pipes can be tested by rod, plate, ring expansion and hydrostatic pressure samples. Rod-shaped, ring-shaped and hydrostatic samples are limited in use due to the requirement of minimum sample diameter, high processing cost and large test cost; plate-shaped samples are the basic choice for testing. [0003] In the processing of plate samples, it is necessary to flatten the steel plate with radian. Different flattening methods lead to different Banschinger effect, and the test resu...

Claims

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Application Information

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IPC IPC(8): G01N1/28B21D1/02
CPCG01N1/28G01N1/286B21D1/02
Inventor 董文利朱庆南浦江宋高峰陈宏达申兆熙丁春雄朱婷俞瞳
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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