JPH01184216A - Manufacture of high mn steel by refining - Google Patents
Manufacture of high mn steel by refiningInfo
- Publication number
- JPH01184216A JPH01184216A JP805488A JP805488A JPH01184216A JP H01184216 A JPH01184216 A JP H01184216A JP 805488 A JP805488 A JP 805488A JP 805488 A JP805488 A JP 805488A JP H01184216 A JPH01184216 A JP H01184216A
- Authority
- JP
- Japan
- Prior art keywords
- ore
- blowing
- steel
- yield
- particle size
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000007670 refining Methods 0.000 title abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 229910000805 Pig iron Inorganic materials 0.000 abstract 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、効率よく、しかもＭｎ歩留の良好な転炉吹
錬による高Ｍｎ鋼の溶製方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing high-Mn steel by converter blowing efficiently and with a good Mn yield.
（従来技術およびその課題）
近年、建造物の高層化あるいは機械装置等の軽量化の指
向がいたって強く、これらの構成素材である鋼材として
、薄肉ですむ高強度鋼が求められている。(Prior Art and its Problems) In recent years, there has been a strong trend toward building taller buildings and reducing the weight of mechanical devices, etc., and high-strength steel that can be used as a constituent material for these structures is in demand.
このような特性を有する鋼材として、高Ｍｎ鋼が他の合
金鋼に比べて有望である。というのは、Ｍｎ源が他の合
金源よりかなり豊富に有り、しかも、最近の製銑、製鋼
技術の進歩によって高価なＦｅ−Ｍｎ合金（フェロマン
ガン）の替わりに安価なＭｎ１石が使用できるようにな
り、比較的低コストで製造できるようになったからであ
る。As a steel material having such characteristics, high Mn steel is more promising than other alloy steels. This is because Mn sources are much more abundant than other alloy sources, and recent advances in ironmaking and steelmaking technology have made it possible to use inexpensive Mn1 stone instead of the expensive Fe-Mn alloy (ferromanganese). This is because it has become possible to manufacture it at relatively low cost.
例えば、本出願人が特開昭５５−９１９１４号公報にお
いて開示したのもＭｎ鉱石を使用する高Ｍｎ鋼の製造方
法の一つである。For example, the present applicant disclosed in Japanese Patent Application Laid-Open No. 55-91914 is one of the methods for producing high Mn steel using Mn ore.
前記公報の方法は転炉に注銑する前の溶銑に造滓剤と酸
素ガスを加えて脱燐し、この脱燐された溶銑を転炉内で
造滓剤を使用することなく吹錬し、吹錬中にＭｎ鉱石を
添加する方法である。The method disclosed in the above publication is to dephosphorize hot metal by adding a slag-forming agent and oxygen gas to the hot metal before pouring it into a converter, and then blowing the dephosphorized hot metal in the converter without using a slag-forming agent. , a method in which Mn ore is added during blowing.
すなはち、脱燐溶銑にＭｎ鉱石を加えて吹錬すると、次
式のようにＭｎ鉱石中のＭｎＯの還元が行われる。In other words, when Mn ore is added to dephosphorized hot metal and blown, MnO in the Mn ore is reduced as shown in the following equation.
ＭｎＯ十Ｃ＝Ｍｎ＋ ＣＯ
この還元反応においては、溶鋼上に存在するスラグは極
く僅かであるからＭｎＯの活量が著しく大きくなり、Ｃ
濃度が低くても溶鋼中のＭｎ分が著しく高くなり得るの
である。そして、造滓剤を添加しないので鋼浴の温度が
上昇し、Ｍｎ鉱石に他にＦｅＯ、ＳｉＯ□等の酸化物を
含有していても還元反応が妨げられることなく進行し、
高Ｍｎｆｉが溶製できるのである。MnO+C=Mn+CO In this reduction reaction, since the amount of slag present on the molten steel is extremely small, the activity of MnO increases significantly, and C
Even if the concentration is low, the Mn content in molten steel can become significantly high. Since no slag-forming agent is added, the temperature of the steel bath increases, and even if the Mn ore contains other oxides such as FeO and SiO□, the reduction reaction proceeds unhindered.
High Mnfi can be produced.
以上のように、脱燐溶銑とＭｎ鉱石の使用によって高Ｍ
ｎｆｉが低コストで製造できるようになった。As mentioned above, high Mn can be obtained by using dephosphorized hot metal and Mn ore.
NFI can now be manufactured at low cost.
しかしながら、本発明者等の実操業から得た経験によれ
ば、溶鋼Ｍｎ分の上昇のためにＭｎ鉱石の添加量を増や
して行くとＭｎ歩留が低下する問題が生し、高Ｍｎ１ｉ
の転炉溶製を行う上で大きな障害となることが明らかに
なった。However, according to the experience gained from actual operations by the present inventors, increasing the amount of Mn ore added to increase the Mn content of molten steel causes a problem in which the Mn yield decreases, and high Mn1i
It has become clear that this is a major obstacle in converter melting.
（課題を解決するための手段）
そこで、本発明者等は上記課題を解決するため、試験研
究を続けた結果、従来のようにＭｎ鉱石の添加量を増加
すると、スラグにＭｎ鉱石が溶は残るようになり、これ
力ＱＩｎ歩留低下の原因になっている、との事実を確認
したのである。(Means for Solving the Problems) Therefore, in order to solve the above problems, the present inventors continued experimental research and found that when the amount of Mn ore added is increased as in the past, Mn ore does not dissolve in the slag. It has been confirmed that this is the cause of the decrease in QIn yield.
第１図は転炉にＭｎ鉱石を添加する量を変えてＭｎの物
質収支を調べた結果を示したものであるが、この図から
Ｍｎ鉱石を増量して行くと、Ｍｎ不明分が増加している
事が認められる。Figure 1 shows the results of examining the mass balance of Mn by changing the amount of Mn ore added to the converter. From this figure, it can be seen that as the amount of Mn ore is increased, the unknown amount of Mn increases. It is recognized that
そこで、ＭｎＯの融点が１７００°Ｃと高いことら、第
１図に示されたＭｎ不明分は未溶解のＭｎ鉱石であろう
、と推定し、スラグを採取してＥＰＭＡ分析を行ったと
ころ、第２図に示すようにＭｎ濃化部が観察され、未溶
解のＭｎ鉱石が存在することが分かったのである。Therefore, since the melting point of MnO is as high as 1700°C, we assumed that the unknown Mn content shown in Figure 1 was undissolved Mn ore, and when we collected slag and conducted EPMA analysis, we found that As shown in FIG. 2, Mn-enriched areas were observed, indicating the presence of undissolved Mn ore.
以上のことから、転炉にＭｎ鉱石を添加してＭｎ歩留が
良く、高Ｍｎｉを溶製するには、Ｍｎ鉱石の溶は残りを
防止することが不可欠であるとの考えに到り、本発明を
するに到ったのである。From the above, we came to the conclusion that in order to add Mn ore to the converter and melt it with a good Mn yield and high Mni, it is essential to prevent the melting of Mn ore from remaining. This led us to the present invention.
すなわち、この発明は、予め脱燐した溶銑にＭｎ鉱石を
添加し、転炉吹錬により高Ｍｎ鋼を溶製するに当たり、
Ｍｎ鉱石の添加を吹錬開始前または吹錬開始から全吹錬
時間の３０％以内に行うと共に、前記ＭｎＫ石の粒度を
１．５〜１００ｍｍとする高Ｍｎｍの溶製方法である。That is, this invention adds Mn ore to pre-dephosphorized hot metal and melts high Mn steel by converter blowing.
This is a high-Mnm melting method in which the Mn ore is added before the start of blowing or within 30% of the total blowing time after the start of blowing, and the particle size of the MnK ore is set to 1.5 to 100 mm.
この本発明において最も重要な点は、
（１）Ｍｎ鉱石の添加時期を吹錬開始前または吹錬開始
から全吹錬時間の３０％以内に行うこと。The most important points in this invention are: (1) Mn ore should be added before the start of blowing or within 30% of the total blowing time from the start of blowing.
（２）Ｍ ｎ鉱石の粒度を１．５〜１００ｍｍにするこ
と、である。(2) The particle size of the Mn ore is 1.5 to 100 mm.
以下その限定理由を説明する。The reason for this limitation will be explained below.
（１） Ｍｎ鉱石の添加時期について
前述のように、Ｍｎ鉱石の溶は残りを無くし高Ｍｎ歩留
を達成するには、Ｍｎ鉱石の添加を早い時期に行い残余
の時間を溶解に当てる必要がある。Ｍｎ鉱石の添加時間
が遅れると溶解時間が不足し、高し１Ｍｎ歩留を確保す
ることが出来ない。(1) Regarding the timing of addition of Mn ore As mentioned above, in order to eliminate the remaining Mn ore and achieve a high Mn yield, it is necessary to add Mn ore early and use the remaining time for dissolution. be. If the addition time of Mn ore is delayed, the dissolution time is insufficient and a high 1Mn yield cannot be ensured.
第３図はＭｎ鉱石の添加時期とＭｎ歩留との関係を示し
たものである。同図中（ａ）はＭｎ鉱石の添加を吹錬を
始める前に行った場合、（ｂ）は吹錬開始から全吹錬時
間の３０χまでの間に添加した場合、（Ｃ）（ｄ）（ｅ
）（ｆ）は、それぞれ吹錬開始から３０〜６０χ、６０
〜８０χ、９０〜１００χの間に添加した場合を示して
し）る。同図から分かるように、吹錬開始前と吹錬開始
から３０χまでの間に添加した場合に、Ｍｎ歩留が７０
％以上に達している。従って本発明におし）では、Ｍｎ
鉱石添加時期を吹錬開始前および全吹錬時間の３０％以
内に行うようにするのである。FIG. 3 shows the relationship between the timing of addition of Mn ore and the Mn yield. In the figure, (a) shows the case where Mn ore is added before the start of blowing, (b) shows the case where it is added between the start of blowing and the total blowing time of 30χ, (C) and (d). (e
)(f) are 30 to 60χ and 60 from the start of blowing, respectively.
- 80χ and cases where it is added between 90 and 100χ). As can be seen from the figure, when Mn is added before the start of blowing and up to 30χ after the start of blowing, the Mn yield is 70
% or more. Therefore, in the present invention), Mn
The ore is added before the start of blowing and within 30% of the total blowing time.
なお、Ｍｎ歩留（χ）とは、 で表せる値である。In addition, Mn yield (χ) is It is a value that can be expressed as
（２）Ｍ ｎ鉱石の粒度について
Ｍｎ鉱石溶解率および添加率はＭｎ粒度に大きく支配さ
れ、適性な粒度でないとＭｎ歩留が向上できない。第４
図にＭｎ鉱石の粒度とＭｎ鉱石の溶解率（Ａ線）及び炉
内添加率（Ｂ線）を示す。Ａ線から分かるように、粒度
が１００ｍｍまでは溶解率はほぼ一定であるが１００ｍ
ｍを越えると急速に低下している。(2) Particle size of Mn ore The Mn ore dissolution rate and addition rate are largely controlled by the Mn particle size, and the Mn yield cannot be improved unless the particle size is appropriate. Fourth
The figure shows the particle size of Mn ore, the dissolution rate of Mn ore (A line), and the in-furnace addition rate (B line). As can be seen from line A, the dissolution rate is almost constant up to a particle size of 100 mm;
When it exceeds m, it decreases rapidly.
また、Ｍｎ鉱石の添加率は（Ｂ線）で示されることから
分かるように、粒度が１．５ｍｍ以上でないと高添加率
は達成できない。それは粒度が小さいと精錬により発生
するＣＯガスの気流によって炉外に持ち出されるからで
ある。Furthermore, as can be seen from the addition rate of Mn ore (line B), a high addition rate cannot be achieved unless the particle size is 1.5 mm or more. This is because if the particle size is small, it will be carried out of the furnace by the stream of CO gas generated during refining.
なお、Ｍｎ鉱石の添加率（χ）は、
で表すものとした。（係数０．４９５はＭｎ鉱石中のＭ
ｎの割合）
従って、溶解率および炉内添加率を同時に高効率とする
には、Ｍｎ鉱石の粒度を１．５から１００ｍｍにする必
要がある。Note that the addition rate (χ) of Mn ore is expressed as follows. (The coefficient 0.495 is M in Mn ore.
(ratio of n) Therefore, in order to simultaneously achieve high efficiency in melting rate and in-furnace addition rate, it is necessary to adjust the particle size of Mn ore to 1.5 to 100 mm.
（実施例）
溶銑予備処理により脱燐した第１表に示す成分と第２表
に示す組成のＭｎ鉱石を準備した。先ず、溶銑を２５０
トン上底吹き転炉に装入すると共に、粒度を３０〜６０
ｍｍ Ｉ、こ調整したＭｎ鉱石を第３表に示すように時
期を変えて添加し、Ｍｎ歩留の変化を間第１表
第３表中テスト１およびテスト２は本発明例であり、テ
スト１はＭｎ鉱石を吹錬前に添加した場合、テスト２は
吹錬開始から全吹錬時間の３０％以内に添加した場合で
ある。テスト３．４．５および６は本発明から外れた場
合の比較例である。第３表にテスト結果を示しているが
、これから分かるように、本発明例のテスト１および２
は７５χの高いＭｎ歩留が得られている。これに対し、
比較例のテスト３．４．５．６は何れも６５％以下であ
り、Ｍｎ鉱石の添加時期が吹錬開始から遅れるにつれる
で、Ｍｎ歩留は象、激に低下している。(Example) Mn ore having the components shown in Table 1 and the composition shown in Table 2 which were dephosphorized by hot metal pretreatment were prepared. First, add 250 molten metal
Particle size is 30~60 while charging to top and bottom blowing converter.
The adjusted Mn ore was added at different times as shown in Table 3, and the changes in Mn yield were measured. Test 1 is a case where Mn ore is added before blowing, and Test 2 is a case where Mn ore is added within 30% of the total blowing time from the start of blowing. Tests 3.4.5 and 6 are comparative examples outside the invention. Test results are shown in Table 3, and as can be seen, Tests 1 and 2 of the present invention example
A high Mn yield of 75χ was obtained. In contrast,
Tests 3, 4, 5, and 6 of the comparative example were all below 65%, and as the time of addition of Mn ore was delayed from the start of blowing, the Mn yield significantly decreased.
次いで、Ｍｎ鉱石の粒度による効果をテストした。第５
図はＭｎの粒度条件が異なる場合のＭｎ歩留を示してい
る。同図中テストＡは本発明で定める粒度に満たない場
合の比較例、テストＢ、 Ｃ、Ｄは本発明で定める範囲
の粒度の場合、テストＥ、 Ｆは本発明の粒度を越えた
場合の比較例である。Next, the effect of the particle size of Mn ore was tested. Fifth
The figure shows the Mn yield when the Mn particle size conditions are different. In the figure, test A is a comparative example when the particle size is less than the particle size defined by the present invention, tests B, C, and D are comparative examples when the particle size is within the range defined by the present invention, and tests E and F are comparative examples when the particle size is beyond the particle size defined by the present invention. This is a comparative example.
このテスト結果によれば、テストＡは粒度が小さいため
、炉内ＣＯガスにより炉外へ飛散し、Ｍｎ歩留が低くな
っている。また、本発明の粒度範囲を越えたテス）Ｅ、
Ｆは溶鋼中Ｃ濃度〔Ｃ〕が０．４χでもＭｎ歩留はせい
ぜい７０％位であるが、（Ｃ）が０．４％以上になると
Ｍｎ歩留はＭｎ鉱石の溶は残りによって逆に低下してい
る。According to the test results, since the particle size of test A was small, the particles were scattered outside the furnace by the CO gas inside the furnace, resulting in a low Mn yield. In addition, test) E which exceeds the particle size range of the present invention,
Even if the C concentration [C] in molten steel is 0.4χ, the Mn yield will be around 70% at most, but if (C) exceeds 0.4%, the Mn yield will be reversed due to the remaining Mn ore dissolution. It is declining.
これに対し、本発明のＢ、Ｃ，Ｄは〔Ｃ〕が低い場合で
も歩留は７０〜８０χあるが、（Ｃ）が高くなるにつれ
て歩留もだんだんと高くなり９０〜９８χにも達成して
いる。On the other hand, B, C, and D of the present invention have a yield of 70 to 80χ even when [C] is low, but as (C) increases, the yield gradually increases and reaches 90 to 98χ. ing.
（発明の効果）
以上説明したように、この発明によれば、高Ｍｎ鋼を溶
製するに当たり、転炉にＭｎ鉱石を添加する時期とＭｎ
鉱石の粒度を特定の範囲とすることによって、効率よく
高Ｍｎ高の溶製が行えるとともに高いＭｎ歩留が達成す
ることができ、産業上貢献するところが大である。(Effects of the Invention) As explained above, according to the present invention, when melting high Mn steel, the timing of adding Mn ore to the converter and the Mn
By setting the grain size of the ore within a specific range, it is possible to efficiently perform melting with a high Mn content and to achieve a high Mn yield, which greatly contributes to industry.
第１図は転炉精練におけるＭｎ鉱石添加量とＭｎ鉱石の
物質収支との関係を示す図、
第２図はスラグ中のＭｎ分布を調査したＥＰＭＡ検査結
果を示す図、
第３図はＭｎ鉱石添加時期とＭｎ歩留との関係を示す図
、
第４図はＭｎ鉱石の粒度とＭｎ鉱石溶解度およびＭｎ鉱
石の炉内添加率との関係を示す図、
第５図はＭｎ鉱石粒度範囲によってＭｎ歩留が変化する
ことを示す図、である。
出願人 住友金属工業株式会社
代理人 弁理士 穂 上 照 忠
（ほか１名）
第１図
第２図
第３図
第４図
Ｍｎ偏石添７７１１１１１１呉月
第５図
ＥＣ］ （％）Figure 1 is a diagram showing the relationship between the amount of Mn ore added in converter smelting and the material balance of Mn ore. Figure 2 is a diagram showing the EPMA test results for investigating the Mn distribution in slag. Figure 3 is Mn ore. Figure 4 shows the relationship between Mn ore particle size, Mn ore solubility, and Mn ore addition rate in the furnace. Figure 5 shows the relationship between Mn ore particle size and Mn yield. FIG. 3 is a diagram showing that the yield changes. Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent Attorney Terutada Hogami (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Mn Bakekizoe 77111111 Kuretsu Figure 5 EC] (%)
Claims (1)
高Ｍｎ鋼を溶製するに当たり、Ｍｎ鉱石の添加を吹錬開
始前または吹錬開始から全吹錬時間の３０％以内に行う
と共に、前記Ｍｎ鉱石の粒度を１．５〜１００ｍｍとす
ることを特徴とする高Ｍｎ鋼の溶製方法。When melting high Mn steel by adding Mn ore to pre-dephosphorized hot metal and blowing it in a converter, add Mn ore before the start of blowing or within 30% of the total blowing time from the start of blowing. A method for producing high Mn steel, characterized in that the grain size of the Mn ore is 1.5 to 100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP805488A JPH01184216A (en) | 1988-01-18 | 1988-01-18 | Manufacture of high mn steel by refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP805488A JPH01184216A (en) | 1988-01-18 | 1988-01-18 | Manufacture of high mn steel by refining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01184216A true JPH01184216A (en) | 1989-07-21 |
Family
ID=11682618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP805488A Pending JPH01184216A (en) | 1988-01-18 | 1988-01-18 | Manufacture of high mn steel by refining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01184216A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015131980A (en) * | 2014-01-09 | 2015-07-23 | 新日鐵住金株式会社 | Method of reducing manganese oxide in converter |
| CN107746906A (en) * | 2017-10-20 | 2018-03-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of technique for carrying out pneumatic steelmaking deoxidation alloying using high-manganese pig iron |
-
1988
- 1988-01-18 JP JP805488A patent/JPH01184216A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015131980A (en) * | 2014-01-09 | 2015-07-23 | 新日鐵住金株式会社 | Method of reducing manganese oxide in converter |
| CN107746906A (en) * | 2017-10-20 | 2018-03-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of technique for carrying out pneumatic steelmaking deoxidation alloying using high-manganese pig iron |
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