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A method for controlling and preserving the state of the two-phase region at the solidification front of molten steel

A phase area and state technology, applied in the field of iron and steel metallurgy, can solve problems such as in-depth analysis of unfavorable metallurgical phenomena

Inactive Publication Date: 2020-03-17
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is still a lack of suitable methods to accurately control and preserve the state of the two-phase region at the solidification front of molten steel, which is not conducive to supporting the in-depth analysis of metallurgical phenomena in the solidification process

Method used

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  • A method for controlling and preserving the state of the two-phase region at the solidification front of molten steel
  • A method for controlling and preserving the state of the two-phase region at the solidification front of molten steel
  • A method for controlling and preserving the state of the two-phase region at the solidification front of molten steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a method for controlling and preserving the state of the two-phase region at the solidification front of molten steel, which specifically includes the following steps:

[0031] S1. Put the steel sample into the crucible 6 after pretreatment, and hang the crucible 6 in the furnace tube 1 of the experimental furnace through the suspension wire 5. The inner diameter of the furnace tube is 60 mm, and the length of the furnace tube is 820 mm. At the same time, by adjusting the length of the suspension wire 5, the bottom of the crucible 6 is 40mm away from the midpoint of the constant temperature zone of the experimental furnace, so that the initial position of the entire crucible 6 is in the constant temperature zone of the experimental furnace.

[0032] Specifically, the steel sample used in this example is Y35Mn sulfur-containing free-cutting steel, and its composition includes the following elements by mass percentage, see Table 1 below for details...

Embodiment 2

[0055] This embodiment provides a method for controlling and preserving the state of the two-phase region at the solidification front of molten steel, which specifically includes the following steps:

[0056] S1. Put the steel sample into the crucible 6 after pretreatment, and hang the crucible 6 in the furnace tube 1 of the experimental furnace through the suspension wire 5. The inner diameter of the furnace tube is 65 mm, and the length of the furnace tube is 840 mm. At the same time, by adjusting the length of the suspension wire 5, the bottom of the crucible 6 is 45mm away from the midpoint of the constant temperature zone of the experimental furnace, so that the initial position of the entire crucible 6 is in the constant temperature zone of the experimental furnace. Among them, the steel sample is cut into a cylinder with a diameter of 8 mm and a height of 90 mm, and the inner diameter of the crucible is 8.5 mm and a height of 110 mm. The selected steel sample compositio...

Embodiment 3

[0062] This embodiment provides a method for controlling and preserving the state of the two-phase region at the solidification front of molten steel, which specifically includes the following steps:

[0063] S1. Put the steel sample into the crucible 6 after pretreatment, and hang the crucible 6 in the furnace tube 1 of the experimental furnace through the suspension wire 5. The inner diameter of the furnace tube is 70 mm, and the length of the furnace tube is 880 mm. At the same time, by adjusting the length of the suspension wire 5, the bottom of the crucible 6 is 48 mm away from the midpoint of the constant temperature zone of the experimental furnace, so that the initial position of the entire crucible 6 is in the constant temperature zone of the experimental furnace. Among them, the steel sample is cut into a cylinder with a diameter of 8.5 mm and a height of 95 mm, and the inner diameter of the crucible is 9 mm and a height of 115 mm. The selected steel sample compositi...

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Abstract

The invention relates to a method for controlling and preserving the state of the two-phase zone at the solidification front of molten steel, which includes the following steps: S1. After the steel sample is pre-treated and loaded into a crucible, the crucible is suspended in an experimental furnace. S2. The crucible is heated to the temperature control temperature with the furnace and kept warm. S3. Measure the temperature at different positions in the furnace tube to obtain the temperature distribution curve in the furnace. S4. Adjust the position of the crucible so that the top temperature of the steel sample is above the liquidus temperature and the bottom temperature is below the solidus temperature, and keep it warm; S5. Make the crucible fall freely into the quenching device for quenching to preserve the molten steel. The state of the two-phase zone at the solidification front. The method of controlling and preserving the state of the two-phase zone at the solidification front of molten steel according to the present invention can preserve the two-phase zone at the solidification front of molten steel and control the width of the two-phase zone at the solidification front of molten steel, and is simple to operate.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for controlling and preserving the state of the two-phase region at the solidification front of molten steel. Background technique [0002] The solidification structure of the steel and the non-metallic second in the steel have an important influence on the subsequent processing of the steel and its mechanical properties. In actual production, the solidification of molten steel and the precipitation and distribution of the second phase are often controlled by changing the cooling conditions. Due to the existence of the temperature gradient, there are usually three regions in the solidification process of molten steel: the liquid phase region, the two-phase region and the solid phase region, and complex nucleation and growth, redistribution of solute elements, second phase precipitation and solid-liquid solidification occur. Allocation behav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
CPCC21D1/18C21D11/005G01N1/2806
Inventor 闵义张庆松陈志平许海生许久健刘承军姜茂发
Owner NORTHEASTERN UNIV LIAONING