Detection device and method for large-particle occluded foreign substances in steel

A technology of large particle inclusion and detection device, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, which can solve the problems of low detection efficiency, sample damage, and inability to detect full volume, and achieves a simple test method and high detection efficiency. , the effect of saving human capital

Inactive Publication Date: 2016-02-10
XINING SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The sample must be destroyed;
[0009] 2. Full volume detection is not possible, the detection efficiency is low, and the detection results cannot fully reflect the quality of the batch of steel

Method used

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  • Detection device and method for large-particle occluded foreign substances in steel
  • Detection device and method for large-particle occluded foreign substances in steel
  • Detection device and method for large-particle occluded foreign substances in steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Type of steel: GCr15 bearing steel (round steel)

[0086] Steel specifications: diameter 60mm

[0087] 1. Preparation of artificial defect samples

[0088] The sample is directly cut from the rolled bar, and the length of the sample is 300mm.

[0089] Pretreatment: Normalizing heat treatment of the sample (purpose: uniform structure, reducing noise interference, improving signal-to-noise ratio), surface turning and polishing of the sample after heat treatment (purpose: preventing detection interference caused by rough surface), turning , After polishing treatment, ellipticity≤1%d, surface roughness Ra≤2.0μm.

[0090] Drilling: 3 holes are machined at the same linear position on the side wall of the round bar For flat-bottomed holes, the depths of the three flat-bottomed holes are: 5mm from the upper surface, 5mm from the center, and 5mm from the lower surface.

[0091] 2. Install the sample

[0092] Punch a hole at one end of the artificial defect sample with a de...

Embodiment 2

[0107] Type of steel: SCM822H automotive steel (square steel)

[0108] Steel specifications: length 150mm, width 150mm, thickness 60mm

[0109] 1. Preparation of artificial defect samples

[0110] The sample is directly cut from the rolled steel, the length of the sample is 200mm, and then processed into a sample with a length of 150mm, a width of 150mm, and a thickness of 60mm.

[0111] Pretreatment: First, normalize heat treatment on the sample, then turn and polish the surface of the sample (turning and polishing should be carried out on the detection surface and the opposite surface), and the surface roughness after treatment is Ra≤2.0μm.

[0112] Drilling: Make 3 Φ0.4mm flat-bottomed holes on the square steel. The center points of the 3 flat-bottomed holes are on a straight line, which is parallel to the rolling direction of the billet and steel plate. The depths of the 3 flat-bottomed holes are: 5mm from the upper surface, to the center, and 5mm from the lower surface....

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Abstract

The invention discloses a detection device and method for large-particle occluded foreign substances in steel. The detection device comprises a water tank, sample testing tables, a three-shaft scanning mechanism, a high-frequency ultrasonic probe, a motion controller, a multi-channel ultrasonic detector and a computer. The sample testing tables include the round bar testing table and square billet testing table and are placed into the water tank. The three-shaft scanning mechanism is installed at the upper portion of the water tank. The high-frequency ultrasonic probe is installed on the shaft in the vertical direction of the three-shaft scanning mechanism. The portion between the steel to be detected and the high frequency ultrasonic probe is filled with water. High-frequency ultrasonic waves transmitted by the high-frequency ultrasonic probe are coupled through water and enter a sample to be tested to detect the steel to be detected. Information detected by the high-frequency ultrasonic probe is transmitted to the multi-channel ultrasonic detector and signal processing is performed through a computer. The detection device has the advantages that the samples do not need to the damaged, the high detection efficiency is achieved, the result is more representative, the detection device can be operated by one person, and human capital is saved.

Description

technical field [0001] The invention relates to a detection device and a detection method, in particular to a detection device and a detection method for large particle inclusions in steel. Background technique [0002] Cleaning is an important trend in the development of modern steel materials, and clean steel production is an important direction for the development of contemporary steelmaking technology. The concept of "clean steel" was first proposed by European scholars in the 1960s, and it specifically refers to the process of improving the strength, toughness and plasticity of steel through strict control of inclusions in steel. In the 1980s, Japanese scholars further proposed the concept of "pure steel", combining the inclusions and the total amount of impurities in steel, and defining Σ(S+P+N+TO+H)≤100ppm. From the 1970s to the mid-1980s, large-scale converters, molten iron pretreatment technology and secondary refining technology developed vigorously. It was not un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 李柏远崔岩张豫海王树远胡彦良
Owner XINING SPECIAL STEEL
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