Ultrasonic flaw detection grading method for internal defects of steel ingot

A technology of internal defects and grading methods, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of inaccurate judgment, image, and intuition, and achieve the elimination of universal forging process cards, strong operability, and reasonable selection. Effect

Inactive Publication Date: 2015-07-29
NANJING DEV ADVANCED MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a simple and convenient ultrasonic flaw detection and classification method for the internal defects of steel ingots in view of the shortcomings of ultrasonic scanning in the prior art that the judgment of steel ingot defects is not accurate enough, vivid and intuitive

Method used

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  • Ultrasonic flaw detection grading method for internal defects of steel ingot
  • Ultrasonic flaw detection grading method for internal defects of steel ingot
  • Ultrasonic flaw detection grading method for internal defects of steel ingot

Examples

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Effect test

Embodiment 1

[0048]Example 1 The continuous casting ingot is tested, the material of the continuous casting billet is AISI 4130, and the size is Ф600×6000mm. Flaw detection is performed every 100mm from one end to the other. The surface of the steel ingot is polished at intervals of 0°, 45°, and 90°, and the width is about 100 mm, so that the surface roughness is 10 μm-30 μm, and the evaluation area is 100 mm×100 mm. Use the circumferential angles of A0, B45, and C90 to operate, and use A, B, and C as signs. The flaw detection sensitivity adopts the test block DAC method, adjusts the bottom wave to an appropriate height, then increases the ndB (eg: 18dB) as the flaw detection sensitivity, and records the equivalent result of flaw detection. The flaw detection equivalent of defect "A" angle is from -14 to -30dB; the flaw detection equivalent of "B" angle is from -13 to -30dB; the flaw detection equivalent of "C" angle is from -14 to -23dB. see Figure 15 , 16 and 17;

Embodiment 2

[0049] Example 2 The continuous casting ingot is tested, the material of the continuous casting billet is AISI 4130, and the size is Ф600×6000mm. Flaw detection is performed every 100mm from one end to the other. The surface of the steel ingot is ground at intervals of 0°, 120°, and 240°, with a width of about 100mm, so that the surface roughness is 10μm-30μm, and the evaluation area is 100mm×100mm. Use the circumferential angles of A0, B120, and C240 ​​to operate, and use A, B, and C as signs. The flaw detection sensitivity adopts the test block DAC method, adjusts the bottom wave to an appropriate height, and then increases the ndB (eg: 18dB) as the flaw detection sensitivity, and records the grade division of flaw detection. The flaw detection grade of flaw "A" angle is from 1 to 3; the flaw detection grade of "B" angle is from 2 to 3; the flaw detection grade of "C" angle is from 2 to 3. see Figure 18 , 19 and 20 as shown;

Embodiment 3

[0050] Example 3 The continuous casting ingot is tested, the material of the continuous casting billet is AISI 4130, and the size is Ф600×6000mm. Flaw detection is performed every 100mm from one end to the other. The surface of the steel ingot is ground at intervals of 0°, 120°, and 240°, with a width of about 100mm, so that the surface roughness is 10μm-30μm, and the evaluation area is 100mm×100mm. Use the circumferential angle of A0 to operate, and use "A" as the logo. The flaw detection sensitivity adopts the test block DAC method, adjusts the bottom wave to an appropriate height, and then increases the ndB (eg: 18dB) as the flaw detection sensitivity, and records the grade division of flaw detection. Flaw "A" angles are graded from 0 to 4 for detection. The part of the shrinkage cavity defect in the center was sawed and analyzed at a low magnification. According to the analysis shown in the low magnification schematic diagram, there are concentrated holes in the local ce...

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Abstract

The invention discloses an ultrasonic flaw detection grading method for internal defects of a steel ingot. Flaw detection is carried out on the steel ingot from one end of the steel ingot to the other end of the steel ingot at an S interval, the operability is high, research is performed in the combination of actual flow detection conditions, and the flaw detection conditions of the steel ingot are divided into five grades from 0 to 4, so that the internal defects of the steel ingot are classified more comprehensively, accurately and visually, and a favorable judgment basis is provided for final judgment of defect grading management. The flaw detection grades corresponding to the defects can be obtained, and then the grade and shape characteristics of the defects are obtained. An accurate forecasting basis is provided for the quality evaluation of the steel ingot, the processing card design of forging, the mechanical property of the product and the like, and effective quality guarantee are also provided for how to eliminate an all-purpose forging processing card in the subsequent forging process. The steel ingot is taken as a raw material for forging, defects are accurately detected at an as-cast condition, reasonable selection of forging technology is facilitated, as-cast crystal particles are sufficiently smashed, and a condition that a forging piece is free of defect is guaranteed.

Description

technical field [0001] The invention relates to an ultrasonic flaw detection grading method for internal defects of steel ingots. Background technique [0002] Steel ingots are one of many steel products, but because the types of steel products used in modern times are all rolled or forged from steel ingots, the pursuit of the quality of steel ingots has always been the pursuit of large steel companies in today's rapid development of the steel industry Target. In the production process of steel ingots, the quality inspection of steel ingots is the most important link. Only by timely and accurately testing the quality of products can enterprises adjust production strategies correctly according to specific production conditions. It can be seen that effective quality inspection of steel ingots can ensure its production efficiency and product quality, and it is also a powerful guarantee for enterprises to obtain economic benefits. [0003] Steel ingots are made by solidifying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 陈昌华张利施虹屹
Owner NANJING DEV ADVANCED MFG
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