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Method for detecting large-sized inclusions in high carbon steel

A detection method, high-carbon steel technology, applied in scanning probe technology, instruments, etc., can solve the problem of low detection probability of large-size inclusions, inability to accurately find large-size inclusions, and inability to use inspection to find large-size inclusions, etc. problems, to shorten the time to find inclusions and avoid missed detection

Inactive Publication Date: 2018-11-13
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the above traditional methods, the detected inclusions are only a small part of the sample, and the detection probability of the large-size inclusions that have the greatest impact on the use is extremely low, and the above methods cannot be used to detect large-size inclusions
At present, there is no effective method for finding large-size inclusions, and the more effective method for predicting large-size inclusions is the extreme value method, which is based on the metallographic statistical analysis of the size of the inclusions detected by the metallographic method, so as to calculate the large-size inclusions in the sample A method of quantity and size, but unable to accurately find the large-size inclusion

Method used

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  • Method for detecting large-sized inclusions in high carbon steel
  • Method for detecting large-sized inclusions in high carbon steel
  • Method for detecting large-sized inclusions in high carbon steel

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: The detection method of large-sized inclusions in the present high-carbon steel is specifically described as follows.

[0025] The main components of the high carbon steel wire rod are (wt): C 0.82%, Si 0.18%, Mn 0.80%, P 0.023%, S0.016%. Prepare a sample of Ф15×400mm from the wire product, pull it off on a tensile testing machine, observe with the naked eye to confirm that the color around the fracture is darker, and the middle is a white point position, and then use a scanning electron microscope to observe the inclusions at the position of the white point, the maximum The maximum width of the dimensional (fracture-causing) inclusion is 31 μm, and the photo of the inclusion is attached figure 1 . The components of the inclusions are MgO%, Al 2 o 3 %, SiO 2 %, CaO% content were 5%, 34%, 31%, 29%.

Embodiment 2

[0026] Embodiment 2: The detection method of the large-size inclusions in the present high-carbon steel is specifically described as follows.

[0027] The main components of the high carbon steel slab are (wt): C 0.62%, Si 0.15%, Mn 0.50%, P 0.022%, S0.015%. Prepare a sample of Ф10×250mm from the billet product, pull it off on a tensile testing machine, and confirm with the naked eye that the color around the fracture is darker and the middle is a white spot, and then use a scanning electron microscope to observe the inclusions at the white spot, the maximum The maximum width of the dimensional (fracture-causing) inclusion is 92 μm, and the photo of the inclusion is attached figure 2 . The components of the inclusions are MgO%, Al 2 o 3 %, SiO 2 %, CaO% content were 4%, 40%, 29%, 27%.

Embodiment 3

[0028] Embodiment 3: The detection method of the large-size inclusions in the present high-carbon steel is specifically described as follows.

[0029] The main components of the high carbon steel bar are (wt): C 0.72%, Si 0.35%, Mn 0.40%, P 0.018%, S0.013%. Cut a sample of Ф5×350mm from the bar product, pull it off on a tensile testing machine, observe with the naked eye to confirm that the color around the fracture is darker, and the middle is a white point position, and then use a scanning electron microscope to observe the inclusions at the position of the white point, the maximum The maximum width of the dimensional (fracture-causing) inclusion is 35 μm, and the photo of the inclusion is attached image 3 . The components of the inclusions are MgO%, Al 2 o 3 %, SiO 2 %, CaO% content were 21%, 67%, 7%, 4%.

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Abstract

The invention discloses a method for detecting large-sized inclusions in high carbon steel. The method comprises the following steps: (1) taking a sample of the high carbon steel product within 3 daysafter production, and then breaking the sample; (2) observing the fracture of the sample to determine the positions of white points on the fracture; and (3) detecting and analyzing the size and composition of inclusions at the white point positions. The method can quickly locate the positions of large-sized inclusions by breaking, facilitates the detection and analysis of the inclusions, determines the size and quantity of inclusions at the maximum level of the sample, determines the inclusion control level of steel products, and guides the improvement of the steelmaking process. The method greatly shortens the time for searching for the inclusions in a detection process, and avoids the condition of frequently missed detection in a conventional detection method.

Description

technical field [0001] The invention belongs to the field of iron and steel material detection, in particular to a method for detecting large-size inclusions in high-carbon steel. Background technique [0002] There are many detection methods for non-metallic inclusions in steel. Traditionally, metallographic methods are commonly used to conduct inductive calculations for the level, size and pass of inspection inclusions. Metallography can only detect a certain plane inside the steel, but cannot detect inclusions in a certain volume, and there are few inclusions detected, and large-size inclusions are rarely or even impossible to detect. The large-sample electrolysis method developed in recent years can test all inclusions in a certain volume, but it takes a very long time to test a larger volume. At present, the electrolysis method can only test inclusions within a volume of a few cubic millimeters, and the test volume is small. At the same time, the electrolysis process t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q30/20
CPCG01Q30/20
Inventor 秦树超黄翠环孟耀青赵昊乾田新中董庆孔令波逯志方王伟何背刚崔延文王欣吕海瑶丁香素郑永瑞郭晓培王玲霞
Owner XINGTAI IRON & STEEL
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