WO2022039036A1 - 高マンガン鋼の溶製方法 - Google Patents
高マンガン鋼の溶製方法 Download PDFInfo
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- WO2022039036A1 WO2022039036A1 PCT/JP2021/029104 JP2021029104W WO2022039036A1 WO 2022039036 A1 WO2022039036 A1 WO 2022039036A1 JP 2021029104 W JP2021029104 W JP 2021029104W WO 2022039036 A1 WO2022039036 A1 WO 2022039036A1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a method for melting high manganese steel, and more particularly to a method for melting high manganese steel having a reduced nitrogen concentration. It was
- Patent Document 1 the degree of vacuum in the degassing tank is set to 2500 to 14000 Pa during the vacuum treatment, so that the carbon concentration is sufficiently lowered while suppressing the volatilization loss of manganese.
- a method has been proposed.
- Patent Document 3 proposes a method of treating a high manganese steel having a manganese concentration of 10% by mass or more under the conditions of a molten metal temperature of 1500 to 1650 ° C. and a vacuum degree of 6000 to 16000 Pa.
- Patent Document 4 in order not to reduce the production efficiency of the factory, metallic manganese is melted in equipment such as an electric furnace, a molten metal having a high manganese concentration is melted in advance, and steel is discharged from the converter. Disclosed is a technique for obtaining a high manganese molten metal having a manganese content of more than 10% by mass by performing combined hot water with ordinary molten steel containing no manganese.
- Japanese Unexamined Patent Publication No. 2005-60782 Japanese Unexamined Patent Publication No. 2005-60783 Japanese Unexamined Patent Publication No. 2010-248536 Japanese Unexamined Patent Publication No. 10-14227
- the manganese concentration of manganese-containing steel grades in general steel products is 1 to 2% by mass, but in recent years, there is an increasing need for steel grades having a manganese content of more than 10% by mass. For such steel grades, it is necessary to add a large amount of manganese source. However, in the case of decarburization and blowing in a normal converter, the manganese yield in steel becomes low due to the oxidation loss of manganese, so it is necessary to add a manganese source after decarburization and blowing in a converter.
- the temperature condition and the vacuum degree condition during the treatment are uniformly specified regardless of the manganese concentration, but the volatile loss of manganese changes greatly depending on the manganese concentration.
- the vacuum treatment of a manganese-containing molten metal of about 10% by mass there is relatively little concern about volatile loss even if the degree of vacuum is increased, as compared with the vacuum treatment of a manganese-containing molten metal of about 40% by mass. Therefore, when vacuum treatment is performed under uniform conditions regardless of the manganese concentration, the denitrification rate may be reduced by excessively lowering the degree of vacuum for a molten metal having a relatively low manganese concentration of about 10% by mass. Productivity will decrease.
- the degree of vacuum in the vacuum degassing treatment For example, if the alloy steel contains chromium, there is no problem even if the degree of vacuum is increased.
- the vapor pressure of manganese at the molten steel temperature is high, so if the degree of vacuum in the vacuum degassing treatment is increased too much, the volatilization loss of manganese increases significantly. Therefore, there is a problem that the metal adheres to the vacuum exhaust equipment piping and the like. Therefore, it was necessary to suppress manganese volatilization loss and reduce the nitrogen concentration in the molten metal at the same time.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to propose a method for melting high-manganese steel that achieves both suppression of manganese volatilization loss and reduction of nitrogen concentration in molten metal.
- the present invention developed to solve the above-mentioned problems and realize the above-mentioned object is as shown in the following gist structure. That is, in the present invention, the manganese concentration is 10% by mass or more and 40% by mass by combining the molten steel that has been decarburized and blown in a converter and then the molten steel that has been separately melted and the high manganese molten metal.
- the following method is for melting high manganese steel. Before vacuum treatment, the nitrogen concentration in the hot water is reduced by performing vacuum treatment between the time of hot water mixing and the time of casting.
- We propose a method for melting high-manganese steel which is characterized by adjusting the degree of vacuum during vacuum treatment based on the manganese concentration in the molten metal and the temperature of the molten metal.
- the vacuum treatment is performed with the vacuum degree P (Pa) during the vacuum treatment within the range represented by the following equation (1).
- T is the molten metal temperature (° C.)
- [Mn] is the manganese concentration (% by mass) in the molten metal
- P is the degree of vacuum (Pa) in the vacuum chamber, which are more preferable solutions. It is thought that it can be. 0.005986 ⁇ T 2-19.07 ⁇ T + 15765.5 + (0.001613 ⁇ T 2 -4.624 ⁇ T + 3319.7) ⁇ [Mn] ⁇ P ⁇ 400 ⁇ [Mn] ... (1)
- a high manganese steel that can reduce the nitrogen concentration in the molten metal while suppressing the manganese volatilization loss and has both a high manganese yield and a low nitrogen content is melted. It became possible. In particular, by appropriately controlling the degree of vacuum during vacuum treatment according to the manganese concentration, it is possible to suppress a decrease in productivity.
- the manganese vapor pressure at the molten steel (molten) temperature increases as the manganese concentration increases.
- the degree of vacuum is increased above the manganese vapor pressure of the treated molten metal, the manganese vapor becomes a state of violent boiling in the vacuum chamber, and there is a problem that the volatilization loss of manganese increases remarkably. Therefore, in order to suppress such a phenomenon, the risk can be reduced by lowering the degree of vacuum.
- the denitrification reaction is promoted as the partial pressure of nitrogen in the vacuum chamber is lower. Therefore, if the degree of vacuum is lowered too much, the partial pressure of nitrogen in the vacuum chamber becomes high, and the nitrogen concentration in the molten metal cannot be lowered.
- the manganese vapor pressure of the manganese-containing molten metal was measured under the condition that the manganese concentration and the molten metal temperature were variously changed, the manganese vapor pressure increased in a quadratic function as the molten metal temperature increased, and also. It was found that it increases in proportion to the manganese concentration. Therefore, it has become possible to obtain the vapor pressure of manganese by regression analysis as a linear expression of manganese concentration and as a secondary expression of molten metal temperature.
- the vacuum degree P (Pa) of the vacuum treatment that achieves both suppression of manganese volatilization loss and reduction of nitrogen concentration is determined by the manganese concentration [Mn] (mass%) in the molten metal. It was clarified that it is expressed as the following equation (1) as a function of the molten metal temperature T (° C.). 0.005986 ⁇ T 2-19.07 ⁇ T + 15765.5 + (0.001613 ⁇ T 2 -4.624 ⁇ T + 3319.7) ⁇ [Mn] ⁇ P ⁇ 400 ⁇ [Mn] ... (1)
- the method for melting high manganese steel according to the present invention is as follows.
- the molten metal temperature T was 1600 ° C.
- the mass% and N concentration were 95 mass ppm.
- the N concentration became 87 mass ppm.
- vacuum degree P 20.0 ⁇ 10 3 Pa (150 torr) (vacuum treatment step).
- the N concentration was 435% by mass.
- the vacuum degree P during the vacuum treatment was appropriately maintained within the range of the formula (1), so that the N concentration was 100 while maintaining the Mn concentration in the molten metal after the vacuum treatment. It was possible to reduce the mass to less than ppm.
- the degree of vacuum P during the vacuum treatment was too high, the Mn concentration in the molten metal after the vacuum treatment was lowered, and manganese loss was observed.
- the degree of vacuum P during the vacuum process is too low, N in the molten metal is hardly reduced.
- Example 2 Using the same equipment as in Example 1, high manganese steel was melted at various manganese concentrations, molten metal temperature T, and vacuum degree P. Table 1 shows the treatment conditions and the Mn concentration [Mn] (mass%) and N concentration [N] (mass ppm) before and after the vacuum treatment. In addition, Table 1 shows the values on the left and right sides of the above equation (1) for comparison with the degree of vacuum P (Pa) during vacuum processing.
- the nitrogen concentration can be reduced without volatile loss of manganese by vacuuming the high manganese molten metal after the combined hot water at an appropriate degree of vacuum, so that high manganese steel can be efficiently produced. It will be possible.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
一般的な鋼製品のマンガン含有鋼種のマンガン濃度は1~2質量%であるが、近年、マンガン含有量が10質量%を超えるような鋼種のニーズが高まっている。このような鋼種では、大量のマンガン源を添加する必要がある。ところが、通常転炉で脱炭吹錬をする場合は、マンガンの酸化損失により鋼中のマンガン歩留まりが低位となるため、転炉での脱炭吹錬後にマンガン源を添加する必要がある。マンガン規格がMn:10質量%以上であるような高マンガン鋼においては、添加するマンガン源の溶解熱補償量も高位となる。そのため、転炉出鋼後の二次精錬プロセスでの熱補償負荷が増加し、生産効率が著しく低下する。
0.005986×T2-19.07×T+15765.5+(0.001613×T2-4.624×T+3319.7)×[Mn]<P<400×[Mn]・・・(1)
0.005986×T2-19.07×T+15765.5+(0.001613×T2-4.624×T+3319.7)×[Mn]<P<400×[Mn]・・・(1)
(a)転炉にて、脱炭吹錬を実施し、普通鋼の溶鋼を取鍋に出鋼する(普通鋼溶製工程)。吹錬中の酸化を考慮すると転炉内にマンガン源を添加しないことが望ましい。
(b)マンガン源を、電気炉などの設備で溶解し、高マンガン溶湯をあらかじめ溶製する。脱りん処理や脱炭処理を行うと酸化によりマンガン損失が生じるので、金属マンガンを溶解することが望ましい(高マンガン溶湯溶製工程)。
(c)転炉から出鋼した普通鋼の溶鋼と、電気炉等で溶解した高マンガン溶湯との合わせ湯を行う(合わせ湯工程)。
(d)合わせ湯工程後の窒素濃度は、数百質量ppmになるため、窒素濃度低減のために、真空脱ガス設備、たとえば、RH式真空脱ガス設備を用いて、真空処理し、窒素濃度を低下させる(真空処理工程)。この際、溶湯のマンガン濃度および溶湯温度に応じて、好ましくは上記(1)式に従い、真空度を適正に制御する。
(e)真空処理後は、LF等の取鍋精錬プロセスにおいて成分調整等を施し、連続鋳造設備もしくは造塊作業にて、鋳造を行う(鋳造工程)。
(処理1)
本発明方法を適用するため、転炉にて、脱炭吹錬を行い、取鍋に出鋼した。出鋼成分として、C:0.02質量%、Mn:0.01質量%の溶鋼200tを得た(普通鋼溶製工程)。また、電気炉において、金属マンガン75tとスクラップ25tを溶解し、Mn濃度が75質量%の高マンガン溶湯100tを得た(高マンガン溶湯溶製工程)。これらの合わせ湯を行った(合わせ湯工程)ところ、Mn:25質量%、N:479質量ppmであった。また、溶湯温度Tは1600℃であった。合わせ湯後の取鍋をRH式真空脱ガス設備に運び、溶湯を真空度P=3333Pa(25torr)の条件で60分間還流した(真空処理工程)ところ、真空処理後のMn濃度は24.9質量%、N濃度は95質量ppmとなった。
比較例として、転炉にて、脱炭吹錬を行い、取鍋に出鋼した。出鋼成分として、C:0.02質量%、Mn:0.01質量%の溶鋼200tを得た(普通鋼溶製工程)。また、電気炉において、金属マンガン75tとスクラップ25tを溶解し、Mn濃度が75質量%の高マンガン溶湯100tを得た(高マンガン溶湯溶製工程)。これらの合わせ湯を行った(合わせ湯工程)ところ、Mn:25質量%、N:524質量ppmであった。また、溶湯温度Tは1600℃であった。合わせ湯後の取鍋をRH式真空脱ガス設備に運び、真空度P=933Pa(7torr)の条件で60分間還流した(真空処理工程)ところ、真空処理後のMn濃度は23.0質量%に下がり、N濃度は87質量ppmとなった。
比較例として、転炉にて、脱炭吹錬を行い、取鍋に出鋼した。出鋼成分として、C:0.02質量%、Mn:0.01質量%の溶鋼200tを得た(普通鋼溶製工程)。また、電気炉において、金属マンガン75tとスクラップ25tを溶解し、Mn濃度が75質量%の高マンガン溶湯100tを得た(高マンガン溶湯溶製工程)。これらの合わせ湯を行った(合わせ湯工程)ところ、Mn:25質量%、N:460質量ppmであった。また、溶湯温度Tは1600℃であった。合わせ湯後の取鍋をRH式真空脱ガス設備に運び、真空度P=20.0×103Pa(150torr)の条件で60分間還流した(真空処理工程)ところ、真空処理後のMn濃度は25.0質量%、N濃度は435質量ppmとなった。
上記実施例1と同様の設備を用い、種々のマンガン濃度や溶湯温度T、真空度Pで高マンガン鋼を溶製した。処理条件と真空処理前後のMn濃度[Mn](質量%)およびN濃度[N](質量ppm)を表1に示す。併せて、表1には、上記(1)式の左辺、右辺の値と真空処理中の真空度P(Pa)を比較のために示す。
Claims (2)
- 転炉にて脱炭吹錬を施したのちに出鋼した溶鋼と、別途溶製した高マンガン溶湯との合わせ湯を行うことで、マンガン濃度10質量%以上40質量%以下である高マンガン鋼を溶製する方法であって、
合わせ湯を行ったのち、鋳造を行うまでの間に、真空処理を施すことで合わせ湯中の窒素濃度を低下させるにあたり、
真空処理前の溶湯中マンガン濃度と溶湯温度に基づき、真空処理中の真空度を調整することを特徴とする高マンガン鋼の溶製方法。 - 前記真空処理中の真空度P(Pa)を下記(1)式で表される範囲として真空処理を行うことを特徴とする請求項1に記載の高マンガン鋼の溶製方法。
0.005986×T2-19.07×T+15765.5+(0.001613×T2-4.624×T+3319.7)×[Mn]<P<400×[Mn]・・・(1)
ここで、T :溶湯温度(℃)、
[Mn]:溶湯中マンガン濃度(質量%)、
P :真空槽内の真空度(Pa)
を表す。
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CN115305312A (zh) * | 2022-07-28 | 2022-11-08 | 鞍钢股份有限公司 | 一种降低vd工序高锰钢锰烧损的方法 |
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JPH10140227A (ja) * | 1996-11-05 | 1998-05-26 | Nkk Corp | 高合金鋼の合わせ湯による製造方法 |
JP2010248536A (ja) * | 2009-04-10 | 2010-11-04 | Sumitomo Metal Ind Ltd | 高Mn含有金属の製造方法 |
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JPH10140227A (ja) * | 1996-11-05 | 1998-05-26 | Nkk Corp | 高合金鋼の合わせ湯による製造方法 |
JP2010248536A (ja) * | 2009-04-10 | 2010-11-04 | Sumitomo Metal Ind Ltd | 高Mn含有金属の製造方法 |
Non-Patent Citations (1)
Title |
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CHOH TAKAO, MORITANI TOORU, INOUYE MICHIO: "Kinetics of Nitrogen Desorption of Liquid Iron, Liquid Fe-Mn and Fe-Cu Alloys under Reduced Pressures", TRANSACTIONS OF THE IRON AND STEEL INSTITUTE OF JAPAN, IRON AND STEEL INSTITUTE OF JAPAN, JP, vol. 19, no. 4, 15 April 1979 (1979-04-15), JP , pages 221 - 230, XP055901950, ISSN: 0021-1583, DOI: 10.2355/isijinternational1966.19.221 * |
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CN115305312A (zh) * | 2022-07-28 | 2022-11-08 | 鞍钢股份有限公司 | 一种降低vd工序高锰钢锰烧损的方法 |
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