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Evaluating method for annealing quality of cold rolled plain carbon steel

An evaluation method, the technology of ordinary carbon steel, is applied in the direction of measuring device, preparation of test samples, material analysis through optical means, etc. Rolling common carbon steel annealing quality and other issues, to achieve the effect of intuitive evaluation method, satisfying smooth production, and easy implementation

Inactive Publication Date: 2013-04-10
磐石建龙钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing method is generally a method for evaluating the performance of a specific type of product, and the range of technical indicators stipulated by it is relatively large, which is not suitable for evaluating the performance of anti-theft door frame materials, especially for evaluating the annealing quality of cold-rolled plain carbon steel

Method used

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  • Evaluating method for annealing quality of cold rolled plain carbon steel
  • Evaluating method for annealing quality of cold rolled plain carbon steel
  • Evaluating method for annealing quality of cold rolled plain carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Raise the temperature of cold-rolled plain carbon steel with a width of 250mm, a thickness of 2.5mm, and a material of Q195L to 380°C, keep it warm for 2 hours, and continue to heat it up to 650°C. room temperature.

[0063] Take two samples respectively from the inside and outside of the upper, middle and lower steel coils to obtain 6 samples; take samples along the rolling direction of the samples to obtain samples respectively; after grinding and polishing the surfaces of the samples respectively, immerse them in Corrosion in 4% nital solution for 30 s, respectively observing the metallographic structure of the samples, and obtaining the metallographic structure diagrams of the samples respectively.

[0064] see Figure 16 , Figure 16 The metallographic structure diagram of the 200-fold magnification of the sample inside the upper steel coil provided by Example 1 of the present invention is obtained by Figure 16 It can be seen that its characteristics meet the r...

Embodiment 2

[0068] Heat the cold-rolled plain carbon steel with a width of 250mm, a thickness of 2.5mm, and a material of Q195L to 380°C, keep it warm for 2 hours, and continue to heat it up to 600°C. After 8 hours of heat preservation, air cooling for 2 hours, water cooling to 300°C, and then natural cooling to room temperature.

[0069] Take two samples respectively from the inside and outside of the upper, middle and lower steel coils to obtain 6 samples; take samples along the rolling direction of the samples to obtain samples respectively; after grinding and polishing the surfaces of the samples respectively, immerse them in Corrosion in 4% nital solution for 30 s, respectively observing the metallographic structure of the samples, and obtaining the metallographic structure diagrams of the samples respectively.

[0070] see Figure 17 , Figure 17 The metallographic structure diagram of the 200-fold magnification of the sample inside the upper steel coil provided by Example 2 of th...

Embodiment 3

[0074] Raise the temperature of cold-rolled plain carbon steel with a width of 250mm, a thickness of 2.5mm, and a material of Q195L to 380°C, keep it warm for 2 hours, and continue to heat it up to 700°C. room temperature.

[0075] Take two samples respectively from the inside and outside of the upper, middle and lower steel coils to obtain 6 samples; take samples along the rolling direction of the samples to obtain samples respectively; after grinding and polishing the surfaces of the samples respectively, immerse them in Corrosion in 4% nital solution for 30 s, respectively observing the metallographic structure of the samples, and obtaining the metallographic structure diagrams of the samples respectively.

[0076] see Figure 18 , Figure 18 The metallographic structure diagram of the magnified 200 times of the sample inside the upper steel coil provided by Example 3 of the present invention is obtained by Figure 18 It can be seen that its characteristics meet the requ...

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Abstract

The invention provides an evaluating method for annealing quality of cold rolled plain carbon steel, comprising the steps of sampling along the rolling direction of the annealed cold-rolled plain carbon steel and obtaining the samples; sequentially mounting, grinding, polishing and corroding the samples and obtaining the metallographic tissue of the sample; comparing the metallographic tissue of the sample with the standard metallographic tissue obtained in advance; and judging the annealing quality of the sample according to the comparison results. In the invention, the metallographic tissueof the sample is compared with the standard metallographic tissue, and the annealing quality of the sample is judged according to the comparison result of the metallographic tissue, thus guiding the adjustment of the annealing technology, thereby meeting the requirement of successful production of anti-theft doorframes. The evaluating method is visual, quick and exact, and is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of ordinary carbon steel quality control, in particular to an evaluation method for the annealing quality of cold-rolled ordinary carbon steel. Background technique [0002] Anti-theft door is a door with both anti-theft and safety performances. It generally includes a door frame embedded in the wall, a door panel and a lock that cooperate with the door frame. Among them, the door frame is generally made of metal and can cooperate with the wall to play an anti-theft function. . The anti-theft door frame must have a certain strength to play an anti-theft role. However, if the strength of the anti-theft door frame material is too high, quality defects such as cracks and cracks are prone to appear at the right-angle bends of the door frame during the production process of the door frame. Therefore, the anti-theft door frame material must have strong High strength and reasonable plasticity. [0003] Plain carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N1/32
Inventor 赵琼
Owner 磐石建龙钢铁有限公司
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