JP6543203B2 - Method for producing nitrogen-containing steel - Google Patents
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- JP6543203B2 JP6543203B2 JP2016027944A JP2016027944A JP6543203B2 JP 6543203 B2 JP6543203 B2 JP 6543203B2 JP 2016027944 A JP2016027944 A JP 2016027944A JP 2016027944 A JP2016027944 A JP 2016027944A JP 6543203 B2 JP6543203 B2 JP 6543203B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 87
- 239000010959 steel Substances 0.000 title claims description 87
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 94
- 229910052757 nitrogen Inorganic materials 0.000 claims description 34
- 238000007664 blowing Methods 0.000 claims description 31
- 238000007654 immersion Methods 0.000 claims description 31
- 229910045601 alloy Inorganic materials 0.000 claims description 29
- 239000000956 alloy Substances 0.000 claims description 29
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 238000003756 stirring Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 3
- 229910001337 iron nitride Inorganic materials 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006902 nitrogenation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 description 1
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005256 carbonitriding Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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Description
本発明は、窒素を含有する鋼を製造する窒素含有鋼の製造方法に関する。 The present invention relates to a method of producing a nitrogen-containing steel for producing a nitrogen-containing steel.
従来用いられていたこの種の窒素含有鋼の製造方法としては、ステンレス鋼を例にすると下記の特許文献１等に示されている方法を挙げることができる。すなわち、従来方法では、高窒素成分の鋼種を溶製するとき、窒素含有合金を溶鋼に投入して加窒を行っている。 As a manufacturing method of this kind of nitrogen containing steel used conventionally, when stainless steel is made into an example, the method shown by following patent document 1 grade | etc., Can be mentioned. That is, in the conventional method, when a steel of high nitrogen content is melted, a nitrogen-containing alloy is introduced into the molten steel to perform nitriding.
上記のような従来方法では、窒素含有合金を溶鋼に投入して加窒を行っている。しかしながら、窒素含有合金からの窒素ガスの発生は不安定であり、上記のような従来方法を採ると溶鋼中の窒素成分にばらつきが生じることがある。鋼中の窒素を微調整するために、取鍋の底部から溶鋼に窒素ガスを吹き込むことも考えられるが、取鍋の底部からの窒素ガスの吹き込みでは、大量の窒素ガスを短時間で溶鋼に吹き込むことができず、鋼中の窒素成分の制御に長時間を要する。 In the conventional method as described above, a nitrogen-containing alloy is charged into molten steel to perform nitriding. However, the generation of nitrogen gas from the nitrogen-containing alloy is unstable, and when the conventional method as described above is adopted, the nitrogen component in molten steel may vary. In order to fine-tune nitrogen in the steel, it is also conceivable to blow nitrogen gas into the molten steel from the bottom of the ladle, but with nitrogen gas blowing from the bottom of the ladle, a large amount of nitrogen gas can be melted into the molten steel in a short time. It can not be blown, and it takes a long time to control the nitrogen component in the steel.
本発明は、上記のような課題を解決するためになされたものであり、その目的は、より短い時間で溶鋼中の窒素成分にばらつきを抑えることができる窒素含有鋼の製造方法を提供することである。 The present invention has been made to solve the problems as described above, and an object thereof is to provide a method for producing a nitrogen-containing steel capable of suppressing variation in nitrogen components in molten steel in a shorter time. It is.
本発明に係る窒素含有鋼の製造方法は、窒素含有合金を溶鋼に投入して溶鋼の窒素成分を調整すること、及び窒素含有合金による窒素成分の調整後に、大気圧下において上吹き浸漬ノズルで溶鋼に窒素ガスを吹き込むことを含む。 In the method for producing nitrogen-containing steel according to the present invention, a nitrogen-containing alloy is introduced into molten steel to adjust the nitrogen component of the molten steel, and after adjusting the nitrogen component by the nitrogen-containing alloy, the upper blowing immersion nozzle under atmospheric pressure is used. Including blowing nitrogen gas into the molten steel.
本発明の窒素含有鋼の製造方法によれば、窒素含有合金による窒素成分の調整後に、大気圧下において上吹き浸漬ノズルで溶鋼に窒素ガスを吹き込むので、より短い時間で溶鋼中の窒素成分にばらつきを抑えることができる。 According to the method for producing a nitrogen-containing steel of the present invention, after adjusting the nitrogen component by the nitrogen-containing alloy, the nitrogen gas is blown into the molten steel with the upper blowing immersion nozzle under atmospheric pressure, so nitrogen components in the molten steel can be shortened in a shorter time. Variation can be suppressed.
以下、本発明を実施するための形態について、図面を参照して説明する。
実施の形態１．
図１は、本発明の実施の形態１による窒素含有鋼の製造方法を示す工程図である。図１に示すように、本実施の形態の窒素含有鋼の製造方法は、窒素含有鋼として窒素含有ステンレス鋼を製造する方法であり、脱炭工程Ｓ１、窒素含有合金投入工程Ｓ２、ガス攪拌工程Ｓ３、サンプリング工程Ｓ４、窒素成分調整工程Ｓ５及び出鍋工程Ｓ６を含んでいる。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1
FIG. 1 is a process chart showing a method of producing a nitrogen-containing steel according to Embodiment 1 of the present invention. As shown in FIG. 1, the method for producing nitrogen-containing steel according to the present embodiment is a method for producing nitrogen-containing stainless steel as nitrogen-containing steel, and includes decarburizing step S1, nitrogen-containing alloy charging step S2, and gas stirring step. S3, sampling process S4, nitrogen component adjustment process S5, and ladle process S6 are included.
脱炭工程Ｓ１は、例えば真空脱ガス処理等により行われるものであり、溶鋼から炭素成分を除く工程である。 Decarbonization process S1 is performed, for example by vacuum degassing etc., and is a process which removes a carbon component from molten steel.
窒素含有合金投入工程Ｓ２は、脱炭が行われた溶鋼に対して窒素含有合金を投入する工程である。溶鋼に投入された窒素含有合金から窒素ガスが発生し溶鋼に窒素が取り込まれることで、溶鋼が加窒される。 The nitrogen-containing alloy charging step S2 is a step of charging a nitrogen-containing alloy to the molten steel which has been subjected to decarburization. When nitrogen gas is generated from the nitrogen-containing alloy introduced into the molten steel and nitrogen is taken into the molten steel, the molten steel is carbonized.
窒素含有合金としては、例えば窒化クロム（Ｎ：約３質量％）、窒化マンガン（Ｎ：約７質量％）、窒化珪素鉄（Ｎ：約３０質量％）等を用いることができる。特に、窒化珪素鉄が多量の窒素を含有しているとともに比較的安価であることから、窒素含有合金として窒化珪素鉄を用いることが好ましい。 As the nitrogen-containing alloy, for example, chromium nitride (N: about 3% by mass), manganese nitride (N: about 7% by mass), silicon iron nitride (N: about 30% by mass) or the like can be used. In particular, silicon iron nitride is preferably used as the nitrogen-containing alloy because silicon iron nitride contains a large amount of nitrogen and is relatively inexpensive.
ガス攪拌工程Ｓ３は、溶鋼に窒素含有合金が投入された後に、溶鋼及び窒素含有合金をガスにより攪拌する工程である。攪拌用のガスとしては、例えばアルゴン等の不活性ガスを用いることができる。 The gas stirring step S3 is a step of stirring the molten steel and the nitrogen-containing alloy with gas after the nitrogen-containing alloy is introduced into the molten steel. As the gas for stirring, for example, an inert gas such as argon can be used.
これら窒素含有合金投入工程Ｓ２及びガス攪拌工程Ｓ３は、窒素含有合金による溶鋼の窒素成分の粗調整を構成している。この粗調整では、窒素含有合金が大気圧下で溶鋼に投入され、窒素含有合金が投入された溶鋼が２６ｋＰａ以上かつ４０ｋＰａ以下（約２００Ｔｏｒｒ〜３００Ｔｏｒｒ）の弱真空の気圧下でガス攪拌されることが好ましい。窒素含有合金が大気圧下で溶鋼に投入されることで、窒素含有合金から窒素ガスが急激に発生して、取鍋から溶鋼が溢れ出ることを回避することができる。また、弱真空の気圧下でガス攪拌することで、溶鋼から窒素ガスが抜け出ることを抑えつつ攪拌効率の向上を図ることができる。 The nitrogen-containing alloy charging step S2 and the gas stirring step S3 constitute rough adjustment of the nitrogen component of the molten steel by the nitrogen-containing alloy. In this rough adjustment, a nitrogen-containing alloy is introduced into the molten steel under atmospheric pressure, and the molten steel into which the nitrogen-containing alloy is introduced is gas-stirred under a weak vacuum pressure of 26 kPa to 40 kPa (about 200 Torr to 300 Torr). Is preferred. By introducing the nitrogen-containing alloy into the molten steel at atmospheric pressure, it is possible to prevent the molten steel from overflowing from the ladle due to the rapid generation of nitrogen gas from the nitrogen-containing alloy. Further, by stirring the gas under a weak vacuum pressure, it is possible to improve the stirring efficiency while suppressing the escape of nitrogen gas from the molten steel.
サンプリング工程Ｓ４は、窒素含有合金による窒素成分の粗調整が行われた溶鋼の成分をサンプリング調査する工程である。この工程において、取鍋中の溶鋼の窒素成分と目標窒素成分との差が得られる。 Sampling process S4 is a process which carries out sampling investigation of the component of molten steel in which rough adjustment of the nitrogen component by nitrogen-containing alloy was performed. In this process, the difference between the nitrogen component of the molten steel in the ladle and the target nitrogen component is obtained.
窒素成分調整工程Ｓ５は、窒素含有合金による窒素成分の粗調整が行われた後に、溶鋼に窒素ガスを吹き込む工程である。吹き込まれた窒素ガスが溶鋼に取り込まれることで、溶鋼の窒素成分と目標窒素成分との差を埋めるように、溶鋼の窒素成分が微調整される。 The nitrogen component adjustment step S5 is a step of blowing nitrogen gas into the molten steel after rough adjustment of the nitrogen component by the nitrogen-containing alloy is performed. By the blown nitrogen gas being taken into the molten steel, the nitrogen component of the molten steel is finely adjusted so as to fill the difference between the nitrogen component of the molten steel and the target nitrogen component.
出鍋工程Ｓ６は、窒素成分が微調整された溶鋼を次の処理工程へ移動する工程である。次の処理工程としては、例えば連続鋳造設備による連続鋳造工程等が挙げられる。 The ladle step S6 is a step of moving the molten steel, the nitrogen component of which has been finely adjusted, to the next processing step. As the next treatment process, for example, a continuous casting process using a continuous casting facility may be mentioned.
次に、図２は、図１の窒素成分調整工程Ｓ５で用いられる加窒設備を示す説明図である。図２に示すように、加窒設備には、収容容器１、ノズル保持台車２及び上吹き浸漬ノズル３が設けられている。
Next, FIG. 2 is an explanatory view showing a nitrogenizing installation used in the nitrogen component adjusting step S5 of FIG. As shown in FIG. 2, a storage container 1, a nozzle holding carriage 2, and an upper blowing
収容容器１は、溶鋼が溜められた取鍋４を収容する容器である。ノズル保持台車２は、収容容器１の上部開口を覆うように移動可能に設けられた台車であり、上吹き浸漬ノズル３を上下方向に変位可能に保持している。
The storage container 1 is a container for storing a ladle 4 in which molten steel is stored. The nozzle holding carriage 2 is a carriage provided so as to be movable so as to cover the upper opening of the storage container 1, and holds the upper blowing
上吹き浸漬ノズル３は、先端３ａから窒素ガスを吹き出すノズルであり、取鍋４の上部開口から先端３ａが溶鋼に浸漬される。この上吹き浸漬ノズル３からの窒素ガスの吹き出し量は周知の取鍋の底部からの窒素ガスの吹き出し量よりも多い。上吹き浸漬ノズル３の先端３ａが溶鋼に浸漬されることで、溶鋼中の窒素ガスの滞在時間が長くなり、より短い時間で溶鋼を加窒することができる。また、本実施の形態の窒素含有鋼の製造方法では、上吹き浸漬ノズル３から溶鋼への窒素ガスの吹き込みは大気圧下で行われる。大気圧下で窒素ガスの吹き込みが行われることで、大気圧よりも低い圧力下で窒素ガスの吹き込みを行う場合と比較して、溶鋼の平衡窒素値を上昇させ、加窒素歩留および到達窒素値を向上させることができる。
The upper blowing
次に、図３は、図２の上吹き浸漬ノズル３の浸漬深さと加窒歩留との関係を示すグラフである。図３の横軸は溶鋼の表面からの上吹き浸漬ノズル３の先端３ａの深さ３ｂ（浸漬深さ）（図２参照）を示し、図３の縦軸は加窒歩留を示している。加窒歩留は、上吹き浸漬ノズル３から吹き出された窒素ガスが溶鋼に取り込まれた割合を示している。
Next, FIG. 3 is a graph showing the relationship between the immersion depth of the upper blowing
図３に示すように、上吹き浸漬ノズル３の溶鋼表面からの浸漬深さが６０ｃｍに達すると、平均約８０％の加窒歩留を得ることができる。このため、上吹き浸漬ノズル３で溶鋼に窒素ガスを吹き込むとき、上吹き浸漬ノズル３の先端が溶鋼の表面から６０ｃｍ以上の深さに位置するように、上吹き浸漬ノズル３が溶鋼に浸漬されることが好ましい。
As shown in FIG. 3, when the immersion depth from the surface of the molten steel of the upper blowing
このような窒素含有鋼の製造方法では、窒素含有合金による窒素成分の調整後に、大気圧下において上吹き浸漬ノズル３で溶鋼に窒素ガスを吹き込むので、より短い時間で溶鋼中の窒素成分にばらつきを抑えることができる。
In such a method of producing a nitrogen-containing steel, after adjusting the nitrogen component by the nitrogen-containing alloy, the nitrogen gas is blown into the molten steel by the upper blowing
また、上吹き浸漬ノズル３で溶鋼に窒素ガスを吹き込むとき、上吹き浸漬ノズル３の先端３ａが溶鋼の表面から６０ｃｍ以上の深さに位置するように、上吹き浸漬ノズル３が溶鋼に浸漬されるので、良好な加窒歩留を得ることができ、より短い時間で溶鋼中の窒素成分にばらつきを抑えることができる。
Also, when nitrogen gas is blown into the molten steel by the upper blowing
さらに、窒素含有合金が大気圧下で溶鋼に投入され、窒素含有合金が投入された溶鋼が２６ｋＰａ以上かつ４０ｋＰａ以下の気圧下でガス攪拌されるので、取鍋から溶鋼が溢れ出ることを回避することができるとともに、攪拌効率の向上を図ることができる。 Furthermore, since the nitrogen-containing alloy is introduced into the molten steel under atmospheric pressure and the molten steel into which the nitrogen-containing alloy is introduced is gas-stirred under the pressure of 26 kPa or more and 40 kPa or less, the molten steel is prevented from overflowing from the ladle The stirring efficiency can be improved.
なお、実施の形態では、窒素成分調整工程Ｓ５において上吹き浸漬ノズル３のみで溶鋼に窒素ガスを吹き込むように説明しているが、上吹き浸漬ノズルに加えて取鍋の底部から溶鋼に窒素ガスをさらに吹き込んでもよい。
In the embodiment, it is described that nitrogen gas is blown into the molten steel only by the upper blowing
また、実施の形態では、窒素含有鋼として窒素含有ステンレス鋼を製造するように説明しているが、窒素を含有する特殊鋼等のステンレス鋼以外の窒素含有鋼にも本発明を適用できる。 Further, although the embodiment is described to manufacture nitrogen-containing stainless steel as the nitrogen-containing steel, the present invention can also be applied to nitrogen-containing steels other than stainless steel such as nitrogen-containing special steel.
３ 浸漬ノズル 3 immersion nozzle
Claims (4)
前記窒素含有合金による窒素成分の調整後に、大気圧下において上吹き浸漬ノズルで前記溶鋼に窒素ガスを吹き込むこと
を含むことを特徴とする窒素含有鋼の製造方法。 Introducing a nitrogen-containing alloy into the molten steel to adjust the nitrogen component of the molten steel, and blowing the nitrogen gas into the molten steel with an upper blowing immersion nozzle under atmospheric pressure after adjusting the nitrogen component by the nitrogen-containing alloy A method of producing a nitrogen-containing steel characterized in that
ことを特徴とする請求項１記載の窒素含有鋼の製造方法。 When nitrogen gas is blown into the molten steel with the upper blowing immersion nozzle, the upper blowing immersion nozzle is immersed in the molten steel so that the tip of the upper blowing immersion nozzle is positioned at a depth of 60 cm or more from the surface of the molten steel. A method for producing a nitrogen-containing steel according to claim 1, characterized in that:
ことを特徴とする請求項１又は請求項２に記載の窒素含有鋼の製造方法。 The nitrogen-containing stainless steel is manufactured as a nitrogen-containing steel. The manufacturing method of the nitrogen-containing steel according to claim 1 or 2 characterized by things.
前記窒素含有合金が投入された前記溶鋼は、２６ｋＰａ以上かつ４０ｋＰａ以下の気圧下でガス攪拌される
ことを特徴とする請求項３記載の窒素含有鋼の製造方法。 The nitrogen-containing alloy is introduced into the molten steel at atmospheric pressure,
The method for producing a nitrogen-containing steel according to claim 3, wherein the molten steel into which the nitrogen-containing alloy is charged is gas-stirred under an atmospheric pressure of 26 kPa or more and 40 kPa or less.
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