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Method and device for quickly detecting bauschinger effect value of pipeline steel in steel plate production field

A Bauschinger effect, pipeline steel technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of loss, control of low rolling temperature, micro cracks on the edge of the steel plate, etc., achieve simple and feasible operation, and avoid detection errors , the effect of fast detection speed

Inactive Publication Date: 2014-01-22
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Due to the high alloy element content and low controlled rolling temperature of high-grade pipeline steel, it is easy to cause micro-cracks on the edge of the steel plate during the finishing rolling stage. Expansion and exposure under the action of tensile stress in the tube forming process, resulting in batch waste and serious economic loss
At present, there is no special method and tool for detecting surface crack sensitivity in the steel plate production site

Method used

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  • Method and device for quickly detecting bauschinger effect value of pipeline steel in steel plate production field

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Embodiment Construction

[0026] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0027] Such as figure 1 As shown, it is a schematic diagram of the working state of a multifunctional mold of the present invention, including an upper die 1 and a lower die 2, the upper die 1 is composed of a slider 1-1, a transmission shaft 1-2 and a punch 1-3, and the slider 1 -1 is connected with the notch on the power device of the press in a bayonet way, which is convenient for disassembly and assembly; the transmission shaft 1-2 plays the role of power transmission, and is smoothly connected with the punch to prevent fatigue cracks caused by stress concentration; punch 1- The outer arc diameter of 3 is identical with the diameter of the steel pipe made by the steel plate, and getting the steel pipe diameter among the present invention is 1016mm. The upper end surface of the lower mold 2 is provided with an arc-shaped punching groove 2-1, a...

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Abstract

The invention relates to the field of performance detection of pipeline steel and in particular relates to a method for quickly detecting the bauschinger effect value and the surface crack sensitivity of the pipeline steel in a steel plate production field as well as a multifunctional mould. The method comprises the following steps: processing a tensile sample and a crack sample by the multifunctional mould, detecting the yield strength value Rp0.2 of the tensile sample, and digitally processing to obtain the bauschinger effect value; detecting the surface crack sensitivity of the crack sample by naked eyes and a magnifier. The multifunctional mould comprises an upper mould and a lower mould, wherein the diameter of an outer arc of a punch head of the upper mould, the diameter of a circular arc of a groove of the lower mould and the diameter of a steel pipe after steel plates are made into the steel pipe are the same. The method has the beneficial effects that the operation is simple and feasible, the detection speed is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of performance detection of pipeline steel, in particular to a method and a device for quickly detecting the Singer effect value and surface crack sensitivity of pipeline ladles at a steel plate production site. [0002] Background technique [0003] Pipeline steel refers to engineering structural steel used to make oil and gas transmission pipelines and other fluid transmission pipelines. Bauschinger effect value and surface crack sensitivity are two important performance indicators of pipeline steel, but these two indicators are currently used in steel plate production sites. There is no effective detection method and device. [0004] The Bauschinger effect refers to the phenomenon that the metal material enters the plastic deformation stage and unloads to zero, and the yield strength is lower than the original state when it is reversely loaded, and the yield strength is higher than the original state when it is fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
Inventor 文新理周乐育张朝磊蒋波刘雅政
Owner UNIV OF SCI & TECH BEIJING
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