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Method for manufacturing large-sized high purity 12Cr% low-ilicon low-aluminum electroslag remelting steel ingot

A technology for electroslag remelting steel and a manufacturing method, which is applied in the field of steel ingot manufacturing, can solve the problems of technical realization difficulty and huge investment, and achieves the effect of reducing oxygen content, small investment and easy realization.

Active Publication Date: 2009-07-01
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for large electroslag ingots of more than 40 tons, vacuum electroslag remelting is not only a huge investment, but also quite difficult to implement technically.

Method used

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  • Method for manufacturing large-sized high purity 12Cr% low-ilicon low-aluminum electroslag remelting steel ingot
  • Method for manufacturing large-sized high purity 12Cr% low-ilicon low-aluminum electroslag remelting steel ingot
  • Method for manufacturing large-sized high purity 12Cr% low-ilicon low-aluminum electroslag remelting steel ingot

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Embodiment Construction

[0034] The method for manufacturing large-scale high-purity 12Cr%-like low-silicon and low-aluminum electroslag remelting steel ingots of the present invention adopts the nitrogen-protected electroslag remelting method to manufacture large-scale high-purity 12Cr%-like low-silicon and low-aluminum steel ingots for high-pressure rotors of ultra-supercritical steam turbines Electroslag remelting steel ingots, the specific steps are as follows:

[0035] 1. Electroslag remelting preparation

[0036] 1.1. Use single-phase bipolar series electroslag remelting furnace or three-phase bipolar series electroslag remelting furnace.

[0037] 1.2. Copper wall water-cooled crystallizer 2 is adopted. The specifications of crystallizer 2 are Φ1760 / Φ1720×3700, that is, the diameter of the upper bottom is 1760mm, the diameter of the lower bottom is 1720mm, and the height is 3700mm. The bottom of the crystallizer 2 is provided with a water-cooled bottom plate 5, such as figure 1 shown.

[003...

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Abstract

The invention discloses a method for manufacturing a large-size high-purity 12Cr percent low-silicon low-aluminum electroslag remelting steel ingot, which comprises the concrete steps of: 1, preparation, in which nitrogen with the pressure of between 0.50 and 0.55MPa is aerated into a crystallizer; 2, refining melt-casting, in which the pressure of the nitrogen in the crystallizer is adjusted to ensure that the slag making is performed when the pressure of the nitrogen is between 0.45 and 0.5MPa, a graphite electrode is taken out after a slag material is entirely melted, the pressure of the nitrogen is adjusted to ensure that the pressure of the nitrogen is between 0.40 and 0.50MPa, and a consumable electrode is arranged for remelting; and 3, ingot stripping. The method utilizes the dry nitrogen which is aerated into the crystallizer in a large quantity during the electroslag remelting to replace air in the crystallizer to ensure that the pressure of the nitrogen in the crystallizer keeps positive pressure, thereby achieving the effect of reducing or removing the oxygen content in gas in a furnace during the electroslag remelting in similar manner. The method has the advantages of small investment, low application cost, and easy realization.

Description

technical field [0001] The invention relates to a method for manufacturing a steel ingot, in particular to a method for manufacturing a large-scale high-purity 12Cr% low-silicon and low-aluminum electroslag remelted steel ingot. Background technique [0002] When the silicon content in steel is ≤0.15%, and the aluminum content is ≤0.015%, it is called low-silicon and low-aluminum steel. At present, the steam turbine rotor material of the mega-kilowatt supercritical thermal power generation unit needs to use high-purity 12Cr% low-silicon and low-aluminum steel. Low (Al≤0.010%). This type of steel is characterized by high purity requirements, narrow chemical composition range, and high mechanical performance indicators. [0003] The electroslag remelting steel ingot produced by the electroslag remelting method has the advantages of uniform chemical composition, dense material, and high purity. Therefore, the current production of 12Cr% low-silicon and low-aluminum steel also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C01B21/02
Inventor 朱孝渭周天煜花小龙向大林王克武
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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