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Smelting technological process of low-silicon low-manganese ultrapure rotor steel

A process method and rotor steel technology, applied in the field of steelmaking process, can solve the problems of not meeting the needs of high-quality rotor steel for steam turbine generator sets and low content of harmful elements, so as to improve the purity of molten steel, improve the quality of tapping, and prevent phosphorus return Effect

Inactive Publication Date: 2011-04-13
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the smelting method of ultra-pure low-pressure rotor steel in the prior art, which can no longer meet the shortage of high-quality rotor steel for steam turbine generator sets. The rotor steel has high purity and low content of harmful elements, and the obtained rotor steel is of excellent quality

Method used

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Embodiment Construction

[0017] The invention of low silicon and low manganese ultra -pure rotor steel smelting process, including the following process:

[0018] (1) Select raw materials. In order to improve the purity of steel water and control the content of impurities in the raw materials, the content of harmful elements in the raw materials is mainly controlled, including but not limited to CU, AS, SN, SB, etc.%, SN ≤ 0.0015%, SB ≤ 0.0015%;

[0019] (2) Put the qualified raw materials into the alkaline arc furnace, make the alkaline arc furnace smelting, control the decarburized amount ⊿ ≥ 0.5%, ensure full deep -dehydrated phosphorus, off -gas smelting efficiency, and use efficient dehydrated residue to use it for efficiencyDesert phosphorus;

[0020] The chemical components and weight content of the high -efficiency dehydrated residue of the present invention are: Feo: 17 ~ 20 WT%, CAO: 50 ~ 59 WT%, SIO 2 : 19 ~ 20 WT%, CAF2: 0.5 ~ 1.5 WT%, Al2O3: 3 ~ 7 WT%, MGO: 6 ~ 8 WT%, R (CAO / SIO2 binary alkal...

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Abstract

The invention discloses a smelting technological process of low-silicon low-manganese ultrapure rotor steel, which comprises the following procedures: (1) selecting raw materials and controlling the content of impurity elements in the raw materials; (2) smelting with a basic electric arc furnace, dephosphorizing with efficient dephosphorization slags, degassing and removing inclusions, and strictly controlling components of tapping molten steel within a target range; (3) refining with a ladle furnace (LF), taking efficient desulfurization slags as reducing and refining slags, deoxidizing, desulfurizing, alloying, modifying inclusions and removing the inclusions in the LF, and adjusting the temperature and the components of the molten steel within a target range; (4) refining with a VD (vacuum degassing) furnace, and carrying out deep desulfurization, degassing (dehydrogenizing) and removing the inclusions in high vacuum; and (5) casting by a vacuum protection mode. By adopting the smelting technological process, the phenomena of silicon increase, manganese increase and rephosphorization of the molten steel are effectively avoided during the smelting process, and the tapping quality of the molten steel is improved; and the obtained rotor steel has high purity, low content of harmful elements and excellent quality.

Description

Technical field [0001] The invention is a steelmaking technology field, especially a super -pure rotor steel smelting process. [0002] Background technique [0003] With the development of the power industry, the steam turbine generator crew has continuously developed to high parameters and large capacity, and puts forward higher requirements for the design, manufacturing and operating reliability of the atomic power station generator set. ThereforeHigh -quality rotor steel with good metallurgy performance is very necessary. [0004] The steel species represented by the ultra -pure low -voltage rotor is 30CR2NI4Mov. The steel type belongs to the Asian -based steel -based medium -alloy structure steel, which is a high -quality high -quality high -strength structural steel.Data show that when the hydrogen content of this steel is high, the phase change during cooling will cause serious internal stress (mainly organizational stress).Tendent, therefore, [H] needs to be controlled be...

Claims

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Application Information

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IPC IPC(8): C22C38/46C22C33/04C21C7/04
Inventor 文光华唐萍祝明妹卢叶李娇
Owner CHONGQING UNIV
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