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Dehydrogenation method

A dehydrogenation and steel type technology, applied in the field of dehydrogenation, can solve the problems of manganese alloy moisture, reduced lubricity of mold slag, increased heat transfer resistance, etc., to reduce manganese loss, reduce hydrogen content, and avoid billet sticking The effect of breakout

Active Publication Date: 2014-01-22
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the hydrogen content in the steel increases, the number of hydrogen bubbles involved in the mold powder increases accordingly, and many pores appear in the mold powder, which increases the heat transfer resistance, reduces the heat dissipation rate, further deteriorates the condition of the mold powder film, and causes the mold powder to crystallize The lubricity in the device is reduced, resulting in the slab bonding breakout or longitudinal cracking
[0003] For steels with a manganese content greater than 7%, due to the large amount of manganese alloy added, the hydrogen content in the steel is often greater than 4.0ppm due to the humidity of the manganese alloy, resulting in slab bonded breakouts during continuous casting of high manganese steel or longitudinal rupture

Method used

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Examples

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Embodiment 1

[0014] The present embodiment is carried out on a 180-ton RH refining furnace, and the highest vacuum degree is 80Pa. The smelted steel is Mn13, the liquidus temperature is 1389°C, and the mass percentage of the chemical composition of the finished product is:

[0015] C 0.90-1.20; Si 0.30-0.80; Mn 11.00-14.00; P≤0.035;

[0016] S≤0.030; Cr≤1.00; Mo≤0.10; V≤0.10;

[0017] The rest is Fe and unavoidable impurities.

[0018] Before dehydrogenation treatment, molten steel is 183t, temperature is 1511℃, ladle space is 350mm, slag thickness is 80mm, fixed hydrogen is 6ppm, chemical composition mass percentage:

[0019] C 1.03; Si 0.38; Mn 13.11; P 0.005; S 0.004;

[0020] Cr 0.85; Mo 0.06; V 0.07; the rest is Fe and unavoidable impurities.

[0021] Vacuumize, cycle for 2 minutes, and the vacuum degree reaches 5×10 2 Pa, at vacuum degree 5×10 2 Under Pa, treat for 25min.

[0022] After treatment, the hydrogen is fixed, the hydrogen content of the molten steel is 1.8ppm, the t...

Embodiment 2

[0027] The present embodiment is carried out on a 90-ton RH refining furnace with a maximum vacuum of 50 Pa. The smelted steel is 20Mn23AlV, the liquidus temperature is 1421°C, and the mass percentage of the chemical composition of the finished product is:

[0028] C 0.14-0.20; Si≤0.50; Mn 21.50-25.00; P≤0.030; S≤0.030;

[0029] Al 1.50-2.50; V 0.05-0.10; the rest is Fe and unavoidable impurities.

[0030] Before dehydrogenation treatment, molten steel is 85t, temperature is 1525°C, ladle space is 400mm, slag thickness is 100mm, fixed hydrogen is 4.3ppm, chemical composition mass percentage:

[0031] C 0.19; Si 0.11; Mn 22.07; P 0.006; S 0.002; Al 2.39;

[0032] V 0.06; the rest is Fe and unavoidable impurities.

[0033] Vacuumize, cycle for 1.5min, and the vacuum degree reaches 10×10 2 Pa, in a vacuum of 10×10 2 Under Pa, treat for 18min.

[0034] After treatment, hydrogen was fixed, the hydrogen content of molten steel was 2.1ppm, the temperature was 1490°C, and the ma...

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Abstract

The invention relates to a dehydrogenation method. According to the method, steel having a manganese content higher than 7% is subjected to dehydrogenation, dehydrogenation is performed in a RH vacuum refining furnace, hydrogen measurement is performed before the dehydrogenation, and the hydrogen content in a steel liquid is more than 4.0 ppm. Steps are characterized in that I: before treatment, the temperature of the steel liquid is not + 80 DEG C less than the liquidus temperature of the steel; and II the vacuum degree is 5*10<2> Pa to 10*10<2> Pa, and the treating time is not less than 18 min. According to the dehydrogenation method, the hydrogen content in the steel liquid decreases to be below 2.5 ppm, and the manganese loss rate after vacuum treatment is less than 2%. The method is capable of reducing the manganese loss in the vacuum treatment at the same time of reducing the hydrogen content in the steel, thus avoiding casting blank adhesion, steel leakage and longitudinal crack generation due to high hydrogen content in continuous casting.

Description

technical field [0001] The invention relates to a dehydrogenation method, which is a dehydrogenation method for steel types with a manganese content greater than 7%. Background technique [0002] Hydrogen is a harmful element in steel. The solubility of hydrogen drops sharply when molten steel solidifies. Hydrogen moves from the solidification front to the surface and enters the liquid slag layer of mold slag. The gaseous hydrogen cannot be dissolved in the liquid slag, and hydrogen bubbles are involved in the slag. As the hydrogen content in the steel increases, the number of hydrogen bubbles involved in the mold powder increases accordingly, and many pores appear in the mold powder, which increases the heat transfer resistance, reduces the heat dissipation rate, further deteriorates the condition of the mold powder film, and causes the mold powder to crystallize The lubricity in the device is reduced, resulting in the slab bonding breakout or longitudinal cracking. [000...

Claims

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Application Information

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IPC IPC(8): C21C7/04
Inventor 张增武
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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