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Control process for improving flaw detection qualification rate of moderately thick plates

A pass rate and process technology, which is applied in the field of control process to improve the pass rate of medium and thick plate flaw detection, can solve the problems of cost increase and instability, and achieve the effects of low difficulty, improved pass rate and obvious gain effect

Inactive Publication Date: 2020-07-10
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The instability and pass rate of the steel plate flaw detection pass rate in the coil factory will lead to the batch change of the steel plate, and the cost due to quality problems will increase significantly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] This embodiment provides a control process for improving the pass rate of medium and heavy plate flaw detection, and takes the production line of Nangang Medium and Heavy Plate Coil Factory as the implementation object. Since October 2016, a new stack cooling process has been implemented.

[0023] From January to September 2016, the pass rate of flaw detection in the medium and heavy plate coil plant was 98.84%. The instability and pass rate of the steel plate flaw detection pass rate in the plate coil plant led to the batch change of the steel plate. , for the blanks of the vacuum process, the demand for stack cooling of steel grades is the main requirement, and the stack cooling requirements for pipeline steel billets are ≥ 48 hours. Vacuum process blanks, rolled flaw detection steel plates with a thickness ≥ 16mm, and the stacking cooling time of blanks is ≥ 48 hours. After the implementation of the process system, from October to December 2016, the pass rate of the ...

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Abstract

The invention discloses a control process for improving the flaw detection qualification rate of moderately thick plates, and relates to the technical field of iron and steel smelting. Blanks treatedthrough a vacuum process are mainly required for stack cooling of steel grades, the stack cooling time of pipeline steel blanks are required to be longer than or equal to 48 hours, the surface qualityis controllable, the steel grades are subjected to hot transferring and hot charging after being vacuumed, and the stack cooling time is shorter than or equal to 24 hours; and for non-vacuum processblanks, the rolling thickness of a flaw detection steel plate is larger than or equal to16 mm, and the blank stack cooling time is longer than or equal to 48 hours. The control process provided by theinvention significantly improves the qualification rate of the flaw detection steel plate in a coil factory, is low in implementation difficulty, does not need additional cost investment, and is obvious in gain effect.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a control process for improving the qualified rate of flaw detection of medium and thick plates. Background technique [0002] The instability and pass rate of the steel plate flaw detection pass rate in the coil factory will lead to the batch change of the steel plate, and the cost caused by the quality problem will increase significantly. After repeated sampling and scanning electron microscope analysis of unqualified steel plates, it was found that there was a large amount of Mn / S in the unqualified parts of the steel plate, and after statistical analysis and comparison of data, the pass rate of flaw detection in vacuum furnaces was significantly higher than that in non-vacuum furnaces. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a control process to improve the pass rate of medium and thic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02B21B37/74
CPCB21B37/74B21B45/0203
Inventor 常运合
Owner NANJING IRON & STEEL CO LTD
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