Method for smelting molten steel and adding rear earth by vacuum induction furnace

An induction furnace and rare earth technology, applied in the direction of improving process efficiency, etc., can solve the problems of difficult precise control of finished rare earth, restricted use, and reduced recovery rate

Inactive Publication Date: 2010-02-17
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because rare earth elements react with dissolved oxygen and oxide inclusions in steel under vacuum and in molten steel, if rare earth wires are added to the molten pool at the end of refining, the recovery rate will be reduced due to the reaction of rare earth elements with crucible ref

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The equipment in this embodiment adopts a 200kg high vacuum induction furnace: the ultimate vacuum is 6.67×10-2Pa, the power supply is 250KW, the frequency is 2500HZ, and the furnace loading capacity is 100kg.

[0030] The steel composition is C: 0.03%, Si: 0.25%, Mn: 0.55%, Ni: 9.4%,

[0031] Re: 0.10% and the rest are Fe and unavoidable impurities.

[0032] In this embodiment, the weight of steel scrap, alloy and rare earth wire required to smelt more than one furnace of steel is shown in Table 1, and the control range and control target of steel composition are shown in Table 2.

[0033] Table 1

[0034] Raw material type

[0035] Table 2

[0036] C％

[0037] Specific steps are as follows:

[0038] (1) Raw material preparation

[0039] According to the calculation of the rare earth element content of the steel type, 0.12kg of rare earth wire needs to be added. Bend the weighed rare earth wire into a circular shape, and spread the steel in...

Embodiment 2

[0060] The equipment adopts a 200kg high vacuum induction furnace: the ultimate vacuum is 6.67×10-2Pa, the power supply is 250KW, the frequency is 2500HZ, and the furnace loading capacity is 100kg. The steel type is die steel 4Cr4MoSiV. See Table 4 for the weight of pure iron, alloy and rare earth wire required to smelt a furnace of mold 4Cr4MoSiV steel in the present invention, and see Table 5 for the control range and control target of the mold steel 4Cr4MoSiV composition.

[0061] Table 4

[0062] Raw material type

High carbon ferrochrome

metal chrome

Ferrovanadium

Ferromolybdenum

manganese metal

Ferrosilicon

pure iron

rare earth

Amount added (kg)

4.30

1.3

0.85

2.25

0.28

0.90

93.0

0.33

[0063] table 5

[0064] C％

Si%

Mn%

Cr％

Mo

V

Re

Control range

0.32 / 0.38

0.7 / 0.9

≤0.65

3.5 / 4.0

1.2 / 1.5

...

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Abstract

The invention relates to a method for smelting molten steel and adding rear earths by a vacuum induction furnace, comprising the following steps: I, raw material preparation, weighed rear earth wiresare bent into an M shape and distributed on ingot moulds, and then the ingot moulds are arranged in a high-vacuum induction furnace; II, charging, pure iron, ferroalloy or returned scrap steels are charged into a crucible of the vacuum induction furnace, and ferrosilicon and metal manganese are put into a hopper; III, vacuum pumping by closing a furnace cover, vacuum pumping is carried out for 12min to 16 min, and furnace burden is heated by supplying power; IV, furnace burden melting; V, refining, solid raw materials which are charged into the furnace are all melted to form molten steel; VI,inflation, after the refining is finished, vacuum pumping is stopped, and argon gas is charged into a cavity of the vacuum furnace; VII, alloying, under the protective atmosphere of the argon gas, rear earth element composition is regulated; VIII, final deoxidation, Al pills are added to carry out deoxidation; and IX, steel tapping casting, steel liquid is poured into the ingot moulds which are wound by the rear earth wires. The method for smelting the molten steel and adding the rear earths by the vacuum induction furnace has high recovery rate of rear earth elements.

Description

technical field [0001] The invention relates to a method for adding rare earth to molten steel in a vacuum induction furnace. Background technique [0002] In order to meet the needs, rare earth must be added to some steel types, and rare earth is added when the molten steel is smelted in the vacuum induction furnace. There are generally two methods for adding rare earths to molten steel in the existing vacuum induction furnace smelting, one is to add rare earth wires to the molten pool at the end of refining, and the other is to add rare earth ferrosilicon to molten steel at the end of refining. Because rare earth elements react with dissolved oxygen and oxide inclusions in steel under vacuum and in molten steel, if rare earth wires are added to the molten pool at the end of refining, the recovery rate will be reduced due to the reaction of rare earth elements with crucible refractories. The recovery rate is less than 30%, and it is difficult to accurately control the fini...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C7/00C21C7/10C21C7/06C21C7/072
CPCY02P10/20
Inventor 赵鸿燕
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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