JP4080390B2 - Melting method of special steel with small lot less than capacity by existing equipment - Google Patents
Melting method of special steel with small lot less than capacity by existing equipment Download PDFInfo
- Publication number
- JP4080390B2 JP4080390B2 JP2003206219A JP2003206219A JP4080390B2 JP 4080390 B2 JP4080390 B2 JP 4080390B2 JP 2003206219 A JP2003206219 A JP 2003206219A JP 2003206219 A JP2003206219 A JP 2003206219A JP 4080390 B2 JP4080390 B2 JP 4080390B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- molten steel
- ladle
- equipment
- capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、設備の処理能力未満の小ロツトの特殊鋼を製造するための溶鋼の溶製方法に関する。
【0002】
【従来の技術】
特殊鋼の製造において、多品種、小ロットの受注に対応して溶製する方法は鋼種の特性から必要不可欠な方法である。しかし、その製造設備における処理能力の最小ロット未満の小ロットの受注に対応する場合、受注した小ロット量の残りの溶鋼は長期仕掛りや屑落しなどのロスとなる問題がある。
【0003】
すなわち、特殊鋼の精錬は、電気炉で原料を溶解および精錬し、得られた溶鋼を取鍋精錬した後、さらに真空脱ガス処理するなどの必要な精錬工程がある。従って、これらの精錬工程を経る必要から、設備の最小処理能力以上のロット量で溶製する必要があるという制約上、特殊鋼におけるその製造設備未満の小ロットの製造に見合う小容量の特別な電気炉や取鍋や脱ガス処理設備などとするためには、これらの必要設備を新設したり、あるいは既存の設備を小ロット用に改造したりする必要がある。しかし、このような新設や設備の改造には多大な投資を必要とする。
【0004】
そこで、精錬済みの溶鋼を電気炉などから分割受鋼する特別な形状の取鍋が提案されている(特許文献1参照。)。しかし、この分割受鋼による方法は操業性を悪化し、さらに成分差の大きく異なる小ロットの製造の場合には不利となる問題がある。さらに、設備を改良する方法では、例えば、60t製鋼工場において電気炉での溶解可能な溶鋼量は50t〜100tであり、これに併せて3種類の取鍋(50t、75t、100t)を保有している。これらの保有する既存の取鍋が50t、75t、100tの3種類である場合、対応できる溶鋼の最小ロットの大きさは50tである。これらの設備をさらに小ロットに対応できるように改造することは、多大な投資を必要とする問題がある。
【0005】
【特許文献1】
特開昭62−133014号公報
【0006】
【発明が解決しようとする課題】
本発明が解決しようとする課題は、上記の既存の製鋼工場設備において、小ロット用に新規に各種設備を製造したり、また、小ロット用に改造することなく既存の設備を使用して、設備能力に達しない小ロットの特殊鋼の精錬を無駄なく実施する方法を提供することである。
【0007】
【課題を解決するための手段】
上記の課題を解決するための本発明の手段は、既存の製鋼設備に配設の電気炉と最小容量の取鍋を使用して電気炉、取鍋精錬炉および真空脱ガス処理装置による通常の精錬工程により特殊鋼を溶製および脱ガス処理し、得られた溶鋼から分湯して目的とする小ロットのインゴットに鋳込み、残余の溶鋼を別途電気炉で溶製した別途成分の溶鋼に混合希釈し、この混合希釈した溶鋼を取鍋精錬し、続いて真空脱ガス処理して新規成分の溶鋼としてインゴットに鋳造する。このように分湯することで設備の最小処理容量を確保しながら既存の製鋼設備の操業性を悪化させること無く、目的とする小ロットの特殊鋼を溶製する方法である。
【0008】
すなわち、請求項1の発明では、電気炉、取鍋精錬炉、真空脱ガス処理装置などからなる既存の製鋼設備を使用し、該設備の取鍋精錬炉で操業可能な最小量の成分の特殊鋼を溶製および脱ガス処理し、この溶製および脱ガス処理した溶鋼から目的とするさらに小ロット量の溶鋼を分湯して該成分からなるインゴットに鋳造し、分湯した残余の溶鋼を新たに該電気炉で溶製した別途成分の溶鋼に混合希釈して新規の特殊鋼成分からなる溶鋼としてこの新規の特殊鋼成分からなる溶鋼を取鍋精錬炉および真空脱ガス処理装置により溶製および脱ガス処理することを特徴とする既存設備の能力未満の小ロット量の特殊鋼の溶製方法である。
【0009】
【発明の実施の形態】
本発明の実施の形態について以下に説明する。先ず、本発明の上記の手段の意義について説明する。
【0010】
1)取鍋精錬や真空脱ガス処理による特殊鋼などの精練工程は使用する取鍋の大きさによって処理できる溶鋼量が決まる。
2)電気炉の出鋼量は、その製鋼設備に備えられた複数の容量の異なる取鍋の処理能力の範囲、例えば取鍋が50t、75t、100tを有する製鋼設備では50t〜100t、で調整可能である。
3)通常、1チャージ目の鋳込完了と3チャージ目の出鋼は、ほぼ同タイミングで実施される。
【0011】
そこで、製鋼工場に備えられた50t、75t、100tの3基の取鍋(LF)を使用する従来の通常工程の場合を比較例として先ず説明する。
【0012】
比較例:電気炉(EF)により目的とする成分の特殊鋼を溶製し、続いてこの溶製した溶鋼を適切な大きさの取鍋に取って取鍋精錬し、さらに真空脱ガス処理装置(RH)により脱ガス処理して清浄度鋼とし、得られた清浄度鋼の溶鋼をインゴット鋳造(IC)する。この工程を表1に示す。なお、表1で示す矢印は処理したことを示している。
【0013】
【表1】
【0014】
次いで、本発明の実施の形態について説明すると、同じく50t、75t、100tの3基の取鍋を備えた製鋼工場において、これらの3基の取鍋を使用して分湯操業工程により実施する。この場合、表2に示すように、先ず電気炉により特殊鋼を溶製し、この溶製した溶鋼を続いて取鍋精錬し、さらに真空脱ガス処理装置により脱ガス処理して清浄度鋼とし、得られた清浄度鋼の溶鋼をインゴット鋳造する。なお、表2で示す矢印は処理したことを示している。
【0015】
【表2】
【0016】
【実施例】
表2に示す実施例では、1チャージ目として、質量%で、1.0%C、0.3%Si、0.5%Mn、1.4%Crを含有する高炭素クロム鋼の50tを電気炉で溶製し、続いて50tの取鍋を使用して取鍋精錬し、さらに真空脱ガス処理した後、25tを分湯して所要の25tをインゴットに鋳込んだ。この1チャージ目の残鋼の25tとは別に、2チャージ目として、質量%で、0.1%C、0.0%Si、0.1%Mn、0.1%Crを含有する75tの溶鋼を電気炉で溶製し、続いて75tの取鍋を使用して取鍋精錬し、さらに真空だつガス処理した後、出鋼して75tをインゴットに鋳込んだ。続いて3チャージ目として2チャージ目と同一の成分の溶鋼を電気炉で溶製し、続いて100tの取鍋を用意し、この取鍋に上記の1チャージ目の残鋼の25tと今回の電気炉で溶製した75tの計100tの溶鋼を受け入れて取鍋精錬し、さらに真空脱ガス処理装置により脱ガス処理した後、この100tの溶鋼を出鋼してインゴットに鋳造した。
【0017】
上記において、1チャージ目の残鋼と3チャージ目の75tの溶鋼を混合することにより、新規成分である0.3%C、0.1%Si、0.2%Mn、0.4%Crを含有する100tの溶鋼が溶製できる。このように、3チヤージ目は希釈されて1チャージ目の1.4%CrよりCrの低い成分の0.4%Crの鋼種が製造された。
【0018】
この本発明の方法によるとき、3チャージ目は0.4%CrよりCr量の多い鋼を造ることも可能で、この場合は、取鍋精錬のときにCrを含有する合金源を添加することでCrは0.4%超とする。
【0019】
以上のように分湯して残鋼を後続のチャージの電気炉で溶製した溶鋼と混合することでその設備の取鍋の能力を満たすことができるので、操業性を悪化させること無く、通常の処理方法で鋼塊を製造することができた。
【0020】
【発明の効果】
以上説明したとおり、本発明は、目的とする小ロットの溶鋼を分湯により得ることで、残鋼を後続のチャージの溶湯に混合することができ、したがって特別な容量の取鍋を新規に必要とすることなく、通常に設備されている容量の取鍋を使用することができることとなり、特殊鋼の小ロット製造を設備改造などのコストアップを生じることなく、さらに設備の操業性を損なうことなく、そのままの設備で実施することができるなど、優れた効果を奏するものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molten steel production method for producing small-lot special steel having a capacity less than the processing capacity of equipment.
[0002]
[Prior art]
In the production of special steel, the method of melting in response to orders for various types and small lots is an indispensable method because of the characteristics of the steel type. However, when dealing with orders for small lots whose processing capacity is less than the minimum lot in the manufacturing facility, there is a problem that the remaining molten steel of the ordered small lot amount causes losses such as long-term work in progress or scrapping.
[0003]
That is, the refining of special steel includes necessary refining processes such as melting and refining raw materials in an electric furnace, refining the obtained molten steel in a ladle, and further vacuum degassing. Therefore, because of the need to go through these refining processes, it is necessary to melt with a lot amount that exceeds the minimum processing capacity of the equipment. In order to use an electric furnace, ladle, degassing treatment facility, etc., it is necessary to newly install these necessary facilities or to modify existing facilities for small lots. However, such new construction and equipment modification require a great investment.
[0004]
Then, the ladle of the special shape which divides and receives the refined molten steel from an electric furnace etc. is proposed (refer patent document 1). However, this method using split steel has a problem that the operability is deteriorated, and it is disadvantageous in the case of manufacturing a small lot having greatly different component differences. Furthermore, in the method of improving equipment, for example, the amount of molten steel that can be melted in an electric furnace in a 60 t steelmaking factory is 50 to 100 t, and in addition, three types of ladles (50 t, 75 t, and 100 t) are held. ing. When these existing ladles are three types of 50t, 75t, and 100t, the size of the minimum lot of molten steel that can be handled is 50t. Remodeling these facilities to accommodate even smaller lots has the problem of requiring significant investment.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 62-133014 [0006]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that the above-mentioned existing steelmaking factory equipment is used to newly manufacture various equipment for small lots, or using existing equipment without modification for small lots, It is to provide a method for refining a small lot of special steel that does not reach facility capacity without waste.
[0007]
[Means for Solving the Problems]
The means of the present invention for solving the above-mentioned problems is a conventional method using an electric furnace, a ladle refining furnace, and a vacuum degassing apparatus using an electric furnace and a ladle with a minimum capacity installed in an existing steelmaking facility. Special steel is melted and degassed by the refining process, and the resulting molten steel is poured into a small lot of ingot, and the remaining molten steel is mixed in a separate component molten steel melted in a separate electric furnace. After diluting, the mixed and diluted molten steel is smelted into a ladle and subsequently vacuum degassed to cast into an ingot as molten steel of a new component. By dividing the hot water in this way, it is a method of melting a target small lot of special steel without deteriorating the operability of the existing steel making equipment while ensuring the minimum processing capacity of the equipment.
[0008]
That is, in the invention of claim 1, an existing steelmaking facility consisting of an electric furnace, a ladle refining furnace, a vacuum degassing apparatus, etc. is used, and a special component of the minimum amount that can be operated in the ladle refining furnace of the facility is used. The steel is melted and degassed, and the desired molten steel in a smaller lot is divided from the melted and degassed molten steel and cast into an ingot composed of the components, and the remaining molten steel is divided. The molten steel consisting of this new special steel component is melted and melted in the ladle refining furnace and the vacuum degassing treatment device as a molten steel consisting of the new special steel component by mixing and diluting with the molten steel of the separate component newly melted in the electric furnace. And a degassing treatment method for producing a special steel in a small lot amount less than the capacity of existing equipment.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. First, the significance of the above means of the present invention will be described.
[0010]
1) The amount of molten steel that can be processed in the refining process for special steel by ladle refining or vacuum degassing treatment is determined by the size of the ladle used.
2) The amount of steel output from the electric furnace is adjusted within a range of processing capacities of a plurality of ladles with different capacities provided in the steel making facility, for example, 50 t to 100 t in a steel making facility having a ladle having 50 t, 75 t, and 100 t. Is possible.
3) Normally, the completion of casting of the first charge and the output of the third charge are performed at substantially the same timing.
[0011]
Then, the case of the conventional normal process which uses three ladles (LF) 50t, 75t, and 100t with which the steelmaking factory was equipped is demonstrated first as a comparative example.
[0012]
Comparative example: A special steel of the target component is melted in an electric furnace (EF), and then the molten steel is taken into a ladle of an appropriate size and smelted in a ladle, and further a vacuum degassing treatment device (RH) is degassed to obtain clean steel, and the resulting clean steel is cast ingot (IC). This process is shown in Table 1. In addition, the arrow shown in Table 1 has shown having processed.
[0013]
[Table 1]
[0014]
Next, an embodiment of the present invention will be described. In a steelmaking factory similarly provided with three ladles of 50 t, 75 t, and 100 t, these three ladles are used to carry out by a water splitting operation process. In this case, as shown in Table 2, first, a special steel is melted in an electric furnace, the molten steel is subsequently refined in a ladle, and further degassed by a vacuum degassing apparatus to obtain clean steel. Then, the obtained clean steel is molten ingot. In addition, the arrow shown in Table 2 has shown having processed.
[0015]
[Table 2]
[0016]
【Example】
In the examples shown in Table 2, 50t of high carbon chromium steel containing 1.0% C, 0.3% Si, 0.5% Mn, 1.4% Cr in mass% as the first charge. After melting in an electric furnace and then refining the ladle using a 50-t ladle, vacuum degassing treatment was performed, 25 t was divided, and the required 25 t was cast into an ingot. Apart from 25t of the remaining steel of the first charge, as the second charge, 75t containing 0.1% C, 0.0% Si, 0.1% Mn and 0.1% Cr in mass%. Molten steel was melted in an electric furnace, and then the ladle was refined using a 75-t ladle, and after further vacuum gas treatment, the steel was removed and 75 t was cast into an ingot. Subsequently, molten steel of the same composition as the second charge was melted in the electric furnace in the third charge, and then a 100 t ladle was prepared, and 25 t of the remaining steel of the first charge was added to this ladle. A total of 100 tons of molten steel of 75 tons melted in an electric furnace was received and smelted in a ladle, and further degassed by a vacuum degassing apparatus , and then the 100 tons of molten steel was removed and cast into an ingot.
[0017]
In the above, by mixing the remaining steel of the first charge and the molten steel of 75 t of the third charge, new components 0.3% C, 0.1% Si, 0.2% Mn, 0.4% Cr 100t of molten steel containing can be made. Thus, the third charge was diluted to produce a 0.4% Cr steel grade having a lower Cr component than the first charge of 1.4% Cr.
[0018]
According to the method of the present invention, the third charge can also produce steel having a Cr content higher than 0.4% Cr. In this case, an alloy source containing Cr is added during ladle refining. And Cr is over 0.4%.
[0019]
Since the capacity of the ladle of the equipment can be satisfied by dividing the hot water as above and mixing the remaining steel with the molten steel melted in the electric furnace of the subsequent charge, it is normal without deteriorating the operability. The steel ingot was able to be manufactured by the processing method.
[0020]
【The invention's effect】
As described above, according to the present invention, it is possible to mix the remaining steel into the molten metal of the subsequent charge by obtaining the desired small lot of molten steel with the split metal, and therefore, a ladle having a special capacity is newly required. Therefore, it is possible to use a ladle with the capacity that is normally installed, and without producing a small lot of special steel, without increasing the cost of equipment modification, etc., and without impairing the operability of the equipment It can be carried out with the equipment as it is, and has excellent effects.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003206219A JP4080390B2 (en) | 2003-08-06 | 2003-08-06 | Melting method of special steel with small lot less than capacity by existing equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003206219A JP4080390B2 (en) | 2003-08-06 | 2003-08-06 | Melting method of special steel with small lot less than capacity by existing equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005054207A JP2005054207A (en) | 2005-03-03 |
JP4080390B2 true JP4080390B2 (en) | 2008-04-23 |
Family
ID=34363150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003206219A Expired - Fee Related JP4080390B2 (en) | 2003-08-06 | 2003-08-06 | Melting method of special steel with small lot less than capacity by existing equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4080390B2 (en) |
-
2003
- 2003-08-06 JP JP2003206219A patent/JP4080390B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2005054207A (en) | 2005-03-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101280366B (en) | Cold smelt process for secondary aluminium | |
JP5583585B2 (en) | Method for producing stainless steel using a direct reduction furnace for ferrochrome and ferronickel on the upstream processing side of the converter | |
CN109777918A (en) | A kind of external refining production method refining high-carbon-chromium bearing steel inclusion particle | |
JP6937190B2 (en) | Ni-Cr-Mo-Nb alloy and its manufacturing method | |
CN109609803B (en) | High-strength wear-resistant copper alloy material, preparation method and sliding bearing | |
JP4080390B2 (en) | Melting method of special steel with small lot less than capacity by existing equipment | |
CN112481526A (en) | Production method of aluminum-silicon alloy rod | |
CN107245636B (en) | Smelting and pouring method for alloy with different chemical components in same heat | |
CN114134393B (en) | Method for producing high-quality 38CrMoAl steel by converter-refining furnace-RH furnace-round billet continuous casting machine | |
CN113430449B (en) | Smelting and continuous casting production process of sulfur-containing free-cutting steel ASTM1141 | |
JP5831199B2 (en) | Manufacturing method of high purity steel | |
RU2749409C1 (en) | Method for smelting high-chromium nickel alloy of ep648-vi grade | |
CN109536774B (en) | Copper alloy material, preparation method and sliding bearing | |
CN109280786B (en) | Aluminum-tungsten intermediate alloy and production method thereof | |
CN106244854A (en) | There is nickel-base alloy and the manufacture method thereof of high-wear resistance | |
JP2003183722A (en) | Method for smelting high cleanliness steel | |
JPS5887234A (en) | Refining method by vacuum melting | |
JP5387045B2 (en) | Manufacturing method of bearing steel | |
JP3960728B2 (en) | Chromium-containing steel slag and its processing method | |
JP5072155B2 (en) | High purity Fe-Cr alloy with excellent formability | |
JP2711779B2 (en) | Treatment method of reducing slag in arc furnace refining | |
CN105969941A (en) | Method for producing high-performance steel casting material by co-smelting with arc furnace and medium-frequency furnace | |
JP2000273525A (en) | Production of high cleanliness steel | |
JP6627642B2 (en) | How to reduce iron ore | |
JP3684445B2 (en) | Manufacturing method of high purity high Ni steel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20060202 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071018 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20071106 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080106 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20080205 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080206 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110215 Year of fee payment: 3 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 4080390 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120215 Year of fee payment: 4 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130215 Year of fee payment: 5 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130215 Year of fee payment: 5 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140215 Year of fee payment: 6 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |