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Tracking analysis method for large size inclusions in steel

A kind of inclusions, large-scale technology, applied in the direction of analyzing materials, material analysis by electromagnetic means, casting molten material containers, etc., can solve difficulties and other problems, achieve the effect of optimizing production process, broad promotion prospects, and improving product quality

Inactive Publication Date: 2018-12-18
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Large-scale inclusions in steel can be separated and extracted by large-scale electrolysis, but deoxidation products, secondary oxidation products of molten steel, corrosion products of refractory materials and ladle slag, tundish slag, Mold slag, etc. are mainly composed of metal oxides such as Si, Al, Mn, Ca, Fe, etc. They have many similarities in composition and form, that is to say, they can be detected by various detection methods. It is very difficult to judge the source of the inclusions only from the composition and structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: The tracking analysis method for large and medium inclusions in Bengang adopts the following specific process.

[0028] The steel type produced in this embodiment is automobile plates, each casting time is six furnaces, and the production process flow is: hot metal pretreatment→260-ton converter→RH refining→slab continuous casting machine. When tapping 1 / 3 to 1 / 2 of the converter, 5% barium carbonate (about 160kg) of slag amount is added to the ladle per heat; 8% cerium oxide (about 60kg) is uniformly added to the tundish covering agent 1) Add to the tundish; mix and mix 5% lanthanum oxide (about 240kg) evenly in the tundish paint; K and Na in the mold powder are used as tracers. Through the above tracers, the contribution of ladle slag, tundish covering agent, tundish coating and mold powder to inclusions in steel can be tracked.

[0029] Sampling of cast slabs in different parts of the two furnaces, after extracting and filtering the slabs by large sample elect...

Embodiment 2

[0031] Embodiment 2: The tracking analysis method of large and medium inclusions in Bengang adopts the following specific process.

[0032] The steel produced in this example is Q235B, with 10 furnaces per pour time, and the production process is: hot metal pretreatment→250t converter→ladle argon blowing→continuous casting. In the production process, 8% of the slag barium carbonate is added to the ladle when the converter taps 1 / 2 to 1 / 3, and 10% of the slag lanthanum oxide is added to the tundish coating agent. Add 8% cerium oxide.

[0033] Through scanning electron microscopy energy spectrum analysis of the large sample electrolytic inclusions in the tundish, it is found that the large inclusions in the tundish are mainly spherical silicate and aluminosilicate, and the composition of different types of inclusions is different. At the same time, it was found that the composition of barium oxide was between 0.19 and 0.95%, indicating that ladle slag was involved in the molten stee...

Embodiment 3

[0035] Embodiment 3: The tracking analysis method of large and medium inclusions in Benxi Steel adopts the following specific process.

[0036] The steel produced in this example is GCr15, with 10 furnaces per casting, and the production process is: hot metal pretreatment→120t converter→LF→RH→continuous casting. In the production process, add 6% barium carbonate with slag amount to the ladle when the first, 5th, and 10th converters are tapping 1 / 2 to 1 / 3, and add 5% slag cerium oxide to the tundish covering agent , Mix 10% lanthanum oxide in the tundish ramming material. Select the first, 5th, and 10th furnaces of the casting order, and conduct systematic sampling in the converter, LF furnace, RH furnace, tundish, mold, continuous casting billet and rolled material.

[0037] Systematic analysis was carried out by means of routine analysis, electrolytic analysis of bulk samples, metallographic and scanning electron microscopy analysis of the samples. The results of electrolysis an...

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Abstract

The invention discloses a tracking analysis method for large size inclusions in steel. The method includes the steps that (1) in a tundish preparation phase, a rare earth compound is added to a coating or a ramming material of a tundish working lining; a rare earth compound is added into a tundish covering agent; and in the LD tapping process, a rare earth compound is added to a steel ladle, rareearth elements in the three rare earth compounds are different, and mold powder contains potassium oxide or sodium oxide; (2) a sample is taken and analyzed by a sample-electrolysing method to determine content of the inclusions in the steel; and (3) the inclusions selected by the sample-electrolysing method are fixed on a metal block, the morphology and composition of the inclusions are observedunder a scanning electron microscope, and sources and distribution of the inclusions in the steel are analyzed according to the contents of the rare earth elements and potassium or sodium. According to the tracking analysis method for the large size inclusions in the steel, sources and distribution of the inclusions in the steel can be thoroughly found out, targeted improvement measures are put forward for improving the cleanliness level of continuous casting slab, the production process is optimized, and the product quality is improved.

Description

Technical field [0001] The invention belongs to the field of metallurgical technology, in particular to a tracking analysis method for large inclusions in steel. Background technique [0002] The control of inclusions in steel has always been an important direction of pure steel metallurgy. The cleanliness of steel is mainly affected by non-metallic inclusions. Non-metallic inclusions not only destroy the continuity and compactness of the steel matrix, but also have a great influence on the mechanical properties and service performance of the steel. Even a small amount of inclusions in the steel will significantly affect the metal properties of the steel, thereby greatly reducing the quality of the steel. [0003] The control of inclusions in steel involves the control of the number, size, size distribution, chemical composition, morphology, and homogenization of inclusions in steel. Among them, the size of inclusions is particularly important, because large-particle inclusions a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/108B22D41/02C21C5/28G01N27/26G01N27/417
CPCB22D11/108B22D41/02C21C5/28C21C2250/00G01N27/26G01N27/417Y02P10/134
Inventor 朱坦华靖振权李建文颜慧成范佳丁剑高福彬巩彦坤
Owner HANDAN IRON & STEEL GROUP
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