KR20140056759A - Method of manufacturing iron alloy having nitrogen using cored wire injection and apparatus for manufacturing the same - Google Patents

Method of manufacturing iron alloy having nitrogen using cored wire injection and apparatus for manufacturing the same Download PDF

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KR20140056759A
KR20140056759A KR1020120122406A KR20120122406A KR20140056759A KR 20140056759 A KR20140056759 A KR 20140056759A KR 1020120122406 A KR1020120122406 A KR 1020120122406A KR 20120122406 A KR20120122406 A KR 20120122406A KR 20140056759 A KR20140056759 A KR 20140056759A
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South Korea
Prior art keywords
nitrogen
cored wire
manufacturing
molten metal
alloy
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KR1020120122406A
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Korean (ko)
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박유진
김상하
손제영
홍석우
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현대제철 주식회사
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Priority to KR1020120122406A priority Critical patent/KR20140056759A/en
Publication of KR20140056759A publication Critical patent/KR20140056759A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Disclosed are a method for manufacturing a nitrogen alloy using a cored wire injecting method and an apparatus for manufacturing the same capable of ensuring sufficient nitrogen using the cored wire injecting method. According to the present invention, the method for manufacturing the nitrogen alloy using the cored wire injecting method and the apparatus for manufacturing the same manufacture a nitrogen-containing iron-based alloy by injecting a nitrogen raw material into a molten iron alloy for manufacturing the nitrogen-containing iron-based alloy, wherein the nitrogen raw material includes a cored wire-shaped nitrogen-containing compound and is injected into the molten iron alloy in a cored wire shape.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method of manufacturing a nitrogen-containing iron-based alloy using a core wire insertion method and an apparatus for manufacturing the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a method of manufacturing a nitrogen-containing iron-based alloy and an apparatus for manufacturing the same, and more particularly, to a method of manufacturing a nitrogen-containing iron-based alloy using a cored wire injection method capable of securing sufficient nitrogen by using a cored wire- And a manufacturing apparatus thereof.

Nitrogen-containing iron-based alloys can exhibit high strength. In general, when vanadium (V), aluminum (Al), titanium (Ti) and nitrogen (N) are added in addition to carbon (C), silicon (Si) and manganese (Mn), TiN, AIN VN and VCN The strength is improved and the crystal grains are made finer.

Nitrogen is typically supplied by a gas line under the ladle furnace, bubbling nitrogen gas, and introducing it into the molten metal.

However, when the vacuum degassing is carried out to secure the cleanliness of the steel, it is difficult to achieve the target nitrogen content.

Background art related to the present invention is a core wire composition for increasing the titanium content of steel disclosed in Korean Patent Laid-Open Publication No. 10-2007-0033025 (published on March 23, 2007).

It is an object of the present invention to provide a method of manufacturing a nitrogen-containing iron-based alloy using a cored wire injection method capable of securing sufficient nitrogen by applying a cored wire introduction method.

According to another aspect of the present invention, there is provided a method of manufacturing a nitrogen-containing iron-based alloy using a cored wire injection method, the method including: preparing a nitrogen-containing iron-based alloy by adding a nitrogen source to a molten metal for producing a nitrogen- The raw material is composed of a nitrogen-containing compound in the form of a cored wire, and is introduced into the molten metal as a core wire.

According to another aspect of the present invention, there is provided an apparatus for manufacturing a nitrogen-containing iron-based alloy using a cored wire injection method, comprising: a furnace for storing a molten metal for producing an alloy; A cored wire insertion portion spaced apart from the furnace and storing the cored wire; And a cored wire feeder for providing a path through which the cored wire stored in the cored wire feeder is supplied to the molten metal.

The method of manufacturing a nitrogen-containing iron-based alloy using the cored wire injection method according to the present invention can rapidly feed a nitrogen source into a molten metal by using a cored wire charging method. Therefore, by ensuring sufficient nitrogen, the fluctuation of the quality can be minimized, and a high strength steel can be provided.

Fig. 1 schematically shows a nitrogen-containing iron-based alloy manufacturing apparatus equipped with a gas line.
FIG. 2 is a schematic view of a nitrogen-containing iron-based alloy manufacturing apparatus to which a cored wire charging method according to the present invention is applied.
Fig. 3 shows a schematic cross-sectional view of a cored wire applied to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Hereinafter, a method for manufacturing a nitrogen-containing iron-based alloy using the cored wire charging method and an apparatus for manufacturing the same will be described in detail with reference to the accompanying drawings.

Fig. 1 schematically shows a nitrogen-containing iron-based alloy manufacturing apparatus equipped with a gas line.

Referring to FIG. 1, a furnace 120 made of iron (Fe), silicon (Si), or the like is stored in the furnace 110. A slag 125 is formed on the surface of the molten metal 120 and the molten metal 120 is cut off from the atmosphere by the slag 125.

In the charging method for charging the nitrogen source into the molten metal, a nitrogen gas is injected through the gas injecting unit 150.

However, when the vacuum degassing is carried out to secure the cleanliness of the steel, the content of nitrogen decreases sharply.

Accordingly, in order to reach the aimed nitrogen content, it is necessary to inject a large amount of nitrogen gas, and a method of securing sufficient nitrogen is required. As a method, Can be introduced.

FIG. 2 is a schematic view of a nitrogen-containing iron-based alloy manufacturing apparatus to which a cored wire charging method according to the present invention is applied. Fig. 3 shows a schematic cross-sectional view of a cored wire applied to the present invention.

 Referring to FIG. 2, a nitrogen-containing iron-based alloy manufacturing apparatus to which a cored wire charging method is applied includes a furnace 210, a cored wire charging unit 230, a cored wire transferring unit 240, .

The furnace 210 stores a molten metal 220 made of iron (Fe), silicon (Si) or the like for producing a nitrogen-containing iron-based alloy. The slag 225 is formed on the surface of the molten metal 220 stored in the furnace 210 and the molten metal 220 is cut off from the atmosphere by the slag 225 on the surface.

The cored wire charging unit 230 stores the cored wire 235, and then inputs the cored wire 235 into the molten metal 220.

The cored wire 235 may have a form in which the nitrogen containing compound 310 is filled in the protective tube 320, as shown in FIG. The protection tube 320 may be made of a steel material that can be easily dissolved in the molten metal.

During the refining process of the molten metal 220, oxygen (O) existing in the molten metal 220 is removed by injecting aluminum (Al), silicon (Si), or the like into the molten metal 220 After the deoxidation process. The cored wire 235 may be inserted before the start of the continuous casting process using the molten metal 220, but is not limited thereto.

The core wire input 230 is preferably spaced apart from the furnace 210 to minimize the effect of the cored wire 235 upon high temperatures and the hot air will rise, As shown in FIG. 2, rather than being spaced apart from the upper portion of the furnace 210.

The cored wire feeder 240 provides a path through which the cored wire 235 stored in the cored wire insert 230 is transported to the melt 220 stored in the furnace 210.

When the cored wire 230 is spaced apart from the side surface of the furnace 210, the outlet of the cored wire transfer part 240 is formed to be inclined with respect to the surface of the molten metal 220 as shown in FIG. 2 . This is to facilitate the insertion of the cored wire 235 from the cored wire input portion 230 to the melt 220 stored in the furnace 210.

When the outlet portion of the core wire transfer portion 240 is almost vertical with respect to the surface of the molten metal 220, it is difficult to input the molten metal into the molten metal 220. Conversely, when the outlet portion of the core wire transfer portion 240 is substantially vertical, The supply of the cored wire 235 from the wire supplying section 230 becomes difficult.

The charging speed v 2 of the core wire 235 is preferably 40 to 400 m / min.

When the feeding rate of the cored wire 235 is less than 40 m / min, nitrogen is oxidized in the atmosphere or in the slag according to the slow rate, and the nitrogen content is finally lowered. On the contrary, when the feeding rate of the core wire 235 exceeds 400 m / min, the feeding of the core wire 235 becomes difficult, and the manufacturing cost may increase.

The gas injection unit 250 may extend to the lower portion of the furnace 210 and may use argon (Ar) gas or nitrogen gas to stir the molten metal 220.

Meanwhile, although not shown in the drawing, the apparatus for manufacturing a nitrogen alloy using the cored wire method according to the present invention may further include a controller (not shown) for controlling the supply amount and supply speed of the cored wire.

Example

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

1. Steel manufacturing

The molten metal according to the embodiment commonly contains 0.41 wt% of carbon (C), 0.60 wt% of silicon (Si), 1.4 wt% of manganese (Mn), 0.025 wt% of phosphorus (P) (Al): 0.01 wt.%, Vanadium (0.03 wt.%), Copper (Cu): 0.20 wt.%, Nickel (Ni): 0.15 wt.%, Chromium (Cr): 0.20 wt.%, Molybdenum V: 0.12 wt%, titanium (Ti): 0.01 wt%, nitrogen (N): 0.014 wt%, and the balance Fe and other unavoidable impurities.

2. Evaluation of Nitrogen Increase

In order to measure the amount of nitrogen increase according to the embodiment, the wire was made of FeMnN alloy, and the protective tube was made of steel.

[Table 1]

Figure pat00001

The amount of nitrogen increase was evaluated by the amount of nitrogen after the wire insertion to the nitrogen amount before the wire insertion of nitrogen.

 It was 0.098 wt% before the use of the core wire method, while it increased to 0.119 wt% when the core wire wire method was used.

In addition, when 100 m of the nitrogen wire was used, it was 0.114 wt% before using the cored wire charging method, and 0.151 wt% when using the cored wire charging method.

The method for manufacturing a nitrogen-containing iron-based alloy according to the present invention comprises the steps of: 0.3 to 0.5% by weight of carbon (C), 0.4 to 0.9% by weight of silicon (Si) (P): 0.03 wt% or less, S: 0.01 to 0.08 wt%, Cu: 0.3 wt% or less, Ni: 0.2 wt% or less, chromium (Ti): 0.02 wt% or less and nitrogen (N): 0.05 to 0.35 wt%, molybdenum (Mo): 0.05 wt% ): 0.005 to 0.025% by weight, and 0.008 to 0.02% by weight (80 ppm to 200 ppm) of nitrogen can be secured through the core wire feeding method.

In addition, when nitrogen is introduced using the cored wire charging method according to the present invention, the nitrogen amount can be increased, and the manufacturing cost of the nitrogen alloy can be greatly reduced.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Such changes and modifications are intended to fall within the scope of the present invention unless they depart from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.

110, 210: Furnace
120, 220: molten metal
125, 225: slag
150, 250: gas injection part
230: Core wire insertion part
235: cored wire
240: cored wire transfer part
310: nitrogen alloy
320: Protection tube

Claims (8)

A nitrogen-containing iron-based alloy is produced by introducing a nitrogen source into an iron-alloy molten metal for producing a nitrogen-containing iron-
Wherein the nitrogen source is made of a nitrogen-containing compound in the form of a cored wire, and is introduced into the iron alloy melt as a core wire.
The method according to claim 1,
The core wire
And the nitrogen containing compound is charged into the protective tube from the cored wire charging part.
3. The method of claim 2,
The protective tube
Wherein the steel sheet is made of a steel material.
The method according to claim 1,
The core wire
Wherein the molten metal is injected at an angle to the surface of the molten metal.
The method according to claim 1,
The feed rate of the cored wire is
40 to 400 < RTI ID = 0.0 > m / min. ≪ / RTI >
A furnace for storing a melt for the manufacture of an alloy;
A cored wire insertion portion spaced apart from the furnace and storing the cored wire; And
And a cored wire feeder for providing a path through which the cored wire stored in the cored wire input portion is supplied to the molten metal.
The method according to claim 6,
The core wire
Wherein the molten metal is injected at an angle to the surface of the molten metal.
8. The method of claim 7,
The feed rate of the cored wire is
40 to 400 < RTI ID = 0.0 > m / min. ≪ / RTI >
KR1020120122406A 2012-10-31 2012-10-31 Method of manufacturing iron alloy having nitrogen using cored wire injection and apparatus for manufacturing the same KR20140056759A (en)

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