JP2016017220A - Special steel for sinter cake supporting stand - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000005245 sintering Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 22
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 11
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 20
- 239000010410 layer Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 7
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 208000025599 Heat Stress disease Diseases 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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Abstract
Description
本発明は、下方吸引式焼結機の焼結パレットに設置されるシンターケーキ支持スタンドの材料として用いるのに適した特殊鋼に関する。 The present invention relates to a special steel suitable for use as a material for a sinter cake support stand installed on a sintering pallet of a downward suction type sintering machine.
高炉等の製鉄プロセスでは、粉鉄鉱石を焼結機で塊状に焼き固めた焼結鉱を原料として使用することが多い。図３は一般的な焼結機による焼結鉱製造工程を示す。この焼結鉱製造工程では、まず、主原料の粉鉄鉱石、副原料の石灰石および燃料のコークスを、それぞれホッパー１１、１２、１３から切り出し、返鉱ホッパー１４から切り出した返鉱とともにミキサー１５で調湿、造粒して焼結原料とする。この焼結原料をサージホッパー１６に搬送して一旦貯蔵した後、ドラムフィーダー１７から切り出し、シュート１８を介して焼結パレット１９の供給部に供給することにより、焼結パレット１９上に焼結原料層２０を形成する。そして、焼結パレット１９により搬送される焼結原料層２０の表層のコークスに点火炉２１で点火して、焼結原料層２０の下方に空気を吸引しながらコークスを燃焼させ、この燃焼熱で焼結原料層２０を上層から下層へ順次焼結していく。この焼結方法を「下方吸引式」という。このようにして焼結が完了した原料は、焼結鉱として焼結パレット１９の排出部から排出される。
In iron making processes such as blast furnaces, sintered ore obtained by sintering powder iron ore into a lump with a sintering machine is often used as a raw material. FIG. 3 shows a sinter production process by a general sintering machine. In this sintered ore production process, first, the main raw material powdered iron ore, the auxiliary raw material limestone, and the fuel coke are cut out from the
上記のような下方吸引式の焼結方法をとる焼結機では、焼結原料層の上層部が下層部よりも先に焼結されて焼結塊（以下、「シンターケーキ」と記す。）となるため、焼結が進むにつれて原料層の下層部がシンターケーキの重みを受けて圧縮され、高密度になっていく。焼結原料層が高密度化すると、通気性が低下して、コークスの燃焼速度の低下や燃焼むらが生じる。その結果、焼結速度が遅くなるし、焼結パレットから排出される焼結鉱の品質のばらつきも大きくなり、生産性が低下しやすい。そこで、通常は、焼結パレットに、シンターケーキの重みを受ける支持部材（以下、「シンターケーキ支持スタンド」、または単に「スタンド」と称する。）を、焼結原料層に埋没するように設置して、原料層の下層部の高密度化による通気性の低下を防止し、焼結鉱の生産性の向上を図っている。 In a sintering machine that employs the downward suction type sintering method as described above, the upper layer portion of the sintering raw material layer is sintered before the lower layer portion, and is sintered (hereinafter referred to as “sinter cake”). Therefore, as the sintering progresses, the lower layer portion of the raw material layer receives the weight of the sinter cake and is compressed to become high density. When the sintered raw material layer is densified, the air permeability is lowered, resulting in a reduction in the combustion rate of coke and uneven combustion. As a result, the sintering speed is slowed, the quality of the sintered ore discharged from the sintering pallet is highly varied, and the productivity tends to be lowered. Therefore, usually, a supporting member that receives the weight of the sinter cake (hereinafter referred to as “sinter cake support stand” or simply “stand”) is placed on the sintering pallet so as to be buried in the sintering material layer. Therefore, the lowering of the air permeability due to the higher density of the lower layer of the raw material layer is prevented, and the productivity of the sintered ore is improved.
ところで、上記シンターケーキ支持スタンドは、焼結パレットの供給部から排出部へ向かう途中で高さ方向に大きな温度差が生じ、焼結パレットの排出部から供給部へ戻るときには全体が冷却されることにより、繰り返し熱応力を受ける。また、その使用環境は、高温の腐食雰囲気となる。従って、このスタンドを形成する材料は、十分な耐熱疲労性と高温強度を有し、耐食性にも優れたものが望ましい。このような特性を備えた材料として、Ｃを０．２mass％程度、Ｃｒを１３mass％程度含む特殊鋼（以下、「０．２Ｃ−１３Ｃｒ系材料」と称する。）を用いることが提案されている（例えば、特許文献１参照。）。 By the way, the sinter cake support stand has a large temperature difference in the height direction on the way from the supply part of the sintering pallet to the discharge part, and the whole is cooled when returning from the discharge part of the sintering pallet to the supply part. Due to repeated thermal stress. Moreover, the use environment becomes a hot corrosive atmosphere. Therefore, it is desirable that the material for forming the stand has sufficient heat fatigue resistance and high temperature strength and is excellent in corrosion resistance. As a material having such characteristics, it has been proposed to use a special steel (hereinafter referred to as “0.2C-13Cr-based material”) containing about 0.2 mass% C and about 13 mass% Cr. (For example, refer to Patent Document 1).
しかしながら、シンターケーキ支持スタンドの材料には、上記の特性に加えて、耐摩耗性も要求される。すなわち、このスタンドは、焼結パレットの供給部に焼結原料が供給されるときや、パレット排出部で焼結完了後の原料が焼結鉱として排出されるときに原料と擦れ合って摩耗する。そして、減肉によりシンターケーキの重みを支えきれなくなって、焼結原料層の通気性低下を防止できなくなると交換が必要となるので、耐摩耗性が寿命の長さを決定する要因の１つとなっている。これに対して、上記０．２Ｃ−１３Ｃｒ系材料で形成したスタンドは、必ずしも耐摩耗性が十分とは言えず、早期摩耗によって短寿命となる場合があった。 However, in addition to the above properties, the material for the sinter cake support stand is also required to have wear resistance. That is, this stand wears by rubbing against the raw material when the sintering raw material is supplied to the supply part of the sintering pallet or when the raw material after completion of sintering is discharged as sintered ore at the pallet discharging part. . And since it is not possible to support the weight of the sinter cake due to thinning and it is not possible to prevent a decrease in air permeability of the sintered raw material layer, it is necessary to replace it. Therefore, wear resistance is one of the factors determining the length of life. It has become. On the other hand, the stand formed of the 0.2C-13Cr material is not necessarily sufficient in wear resistance, and may have a short life due to early wear.
そこで、本発明者らは、上記０．２Ｃ−１３Ｃｒ系材料をベースとして、Ｃ含有量を多くして（０．５mass％程度）硬度を高めることにより、耐摩耗性を向上させた特殊鋼を提案した（特許文献２参照。）。 Accordingly, the present inventors have developed a special steel with improved wear resistance by increasing the hardness by increasing the C content (about 0.5 mass%) based on the 0.2C-13Cr-based material. Proposed (see Patent Document 2).
上記特許文献２に記載の材料で形成したシンターケーキ支持スタンドでは、０．２Ｃ−１３Ｃｒ系材料で形成したものに比べて摩耗の進行はある程度遅くなったものの、割れの発生によって短寿命となるケースが多くなった。これは、Ｃ含有量を多くした特許文献２の材料では、Ｃ含有量に応じてＳｉ含有量を制限することによって延性を確保しようとしているが、スタンドの使用条件のバラツキ等によって相対的に延性が不足してしまう場合があるためと考えられる。 In the case of the sinter cake support stand formed of the material described in Patent Document 2, the progress of wear is somewhat slow compared to that formed of 0.2C-13Cr-based material, but the life becomes short due to the occurrence of cracks. Increased. This is because in the material of Patent Document 2 in which the C content is increased, the ductility is attempted to be secured by limiting the Si content in accordance with the C content. This may be due to the fact that there may be a shortage of.
そこで、本発明の課題は、下方吸引式焼結機の焼結パレットに設置されるシンターケーキ支持スタンドを、割れにくくかつ摩耗しにくいものとして長寿命化することである。 Accordingly, an object of the present invention is to extend the life of a sinter cake support stand installed on a sintering pallet of a downward suction type sintering machine as being difficult to crack and wear.
上記の課題を解決するために、本発明は、シンターケーキ支持スタンドの材料に用いられる特殊鋼として、Ｃ：０．１〜０．４mass％、Ｓｉ：０．２〜２．０mass％、Ｍｎ：０．１〜１．５mass％、Ｃｒ：１１〜１５mass％を含有するとともに、Ｍｏ：０．２〜０．８mass％と、Ｗ：０．５〜１．５mass％と、Ｎｂ：０．２〜０．８mass％のうちの少なくとも１種、好ましくは、Ｍｏ：０．３〜０．７mass％と、Ｗ：０．７〜１．３mass％と、Ｎｂ：０．３〜０．７mass％のうちの少なくとも１種を含有し、残部がＦｅおよび不可避的不純物からなるものを採用した。 In order to solve the above-mentioned problems, the present invention provides C: 0.1 to 0.4 mass%, Si: 0.2 to 2.0 mass%, Mn: as special steel used for the material of the sinter cake support stand. While containing 0.1 to 1.5 mass%, Cr: 11 to 15 mass%, Mo: 0.2 to 0.8 mass%, W: 0.5 to 1.5 mass%, and Nb: 0.2 to At least one of 0.8 mass%, preferably, Mo: 0.3 to 0.7 mass%, W: 0.7 to 1.3 mass%, and Nb: 0.3 to 0.7 mass% These were used, and the balance was composed of Fe and inevitable impurities.
すなわち、シンターケーキ支持スタンド用特殊鋼の組成を、０．２Ｃ−１３Ｃｒ系材料をベースとして、Ｃ含有量を変化させずに、Ｍｏ、Ｗ、Ｎｂのうちの少なくとも１種を適量添加したものとすることにより、この特殊鋼で形成したスタンドが割れを生じにくくかつ耐摩耗性に優れたものとなるようにしたのである。 That is, the composition of the special steel for the sinter cake support stand is based on a 0.2C-13Cr-based material and an appropriate amount of at least one of Mo, W, and Nb is added without changing the C content. By doing so, the stand made of this special steel is made to be less prone to cracking and excellent in wear resistance.
次に、各合金元素の含有量を上記の範囲に限定した理由について説明する。
（１）Ｃは、一部が母材に固溶して母材を強化するほか、炭化物を形成して、高温強度および硬度を高めるために有効な元素である。必要な高温強度を確保するために、少なくとも０．１mass％含むようにする。含有量が多いほど、高温強度および硬度は高くなるが、高温使用時の時効による２次炭化物の析出量が過剰になって延性の低下を招くようになるので、含有量の上限を０．４mass％とした。
Next, the reason why the content of each alloy element is limited to the above range will be described.
(1) C is an element effective for increasing the high-temperature strength and hardness by forming a carbide in addition to strengthening the base material by partly dissolving in the base material. In order to ensure the required high temperature strength, at least 0.1 mass% is included. The higher the content, the higher the high-temperature strength and hardness. However, the precipitation amount of secondary carbide due to aging at the time of high-temperature use becomes excessive, leading to a decrease in ductility, so the upper limit of the content is 0.4 mass. %.
（２）Ｓｉは、合金溶解時の脱酸元素であり、鋳造工程における溶湯の流動性を高める効果を有する。また、高温における耐食性も向上させる。これらの効果は含有量に比例して向上するが、過剰に含有すると延性低下を招くので、含有量は２．０mass％以下とする。一方、含有量が極端に少ないと、熱サイクルを受けた後に焼きが入りやすくなって延性低下を招くので、０．２mass％以上含有する必要がある。 (2) Si is a deoxidizing element when the alloy is melted, and has the effect of increasing the fluidity of the molten metal in the casting process. It also improves the corrosion resistance at high temperatures. These effects are improved in proportion to the content. However, if the content is excessive, the ductility is lowered, so the content is 2.0 mass% or less. On the other hand, if the content is extremely small, baking is likely to occur after receiving a thermal cycle, resulting in a decrease in ductility. Therefore, it is necessary to contain 0.2 mass% or more.
（３）Ｍｎは、脱酸作用を有し、またＳを固定して無害化する元素であり、０．１mass％以上含有する必要がある。一方、１．５mass％以上に増量しても効果の増加は少ないので、含有量の上限を１．５mass％とした。 (3) Mn is an element having a deoxidizing action and detoxifying by fixing S, and it is necessary to contain 0.1 mass% or more. On the other hand, even if the amount is increased to 1.5 mass% or more, since the increase in the effect is small, the upper limit of the content is set to 1.5 mass%.
（４）Ｃｒは、高温強度および耐食性を高める元素であるが、過剰に含有すると延性低下を招くので、１１〜１５mass％含有するようにした。 (4) Cr is an element that enhances the high-temperature strength and corrosion resistance, but if contained excessively, ductility is reduced, so 11-15 mass% is contained.
（５）ＭｏとＷは、ともに耐熱疲労性と高温強度を向上させる元素であり、Ｗは硬度を高め耐摩耗性を向上させる効果も大きい。そこで、これらの効果が確実に得られるように、Ｍｏの下限値は０．２mass％（好ましくは０．３mass％）、Ｗの下限値は０．５mass％（好ましくは０．７mass％）とした。一方、いずれの元素も過剰に含有すると延性低下を招くので、Ｍｏの上限値を０．８mass％（好ましくは０．７mass％）、Ｗの上限値を１．５mass％（好ましくは１．３mass％）とした。また、ＭｏとＷを複合添加すると、それぞれの単独添加の場合よりも高温強度を長時間維持できるようになる。 (5) Mo and W are both elements that improve heat fatigue resistance and high-temperature strength, and W has a great effect of increasing hardness and wear resistance. Therefore, the lower limit value of Mo is 0.2 mass% (preferably 0.3 mass%) and the lower limit value of W is 0.5 mass% (preferably 0.7 mass%) so that these effects can be reliably obtained. . On the other hand, if any of these elements is contained excessively, ductility is reduced, so the upper limit of Mo is 0.8 mass% (preferably 0.7 mass%) and the upper limit of W is 1.5 mass% (preferably 1.3 mass%). ). Further, when Mo and W are added in combination, the high temperature strength can be maintained for a longer time than in the case of adding each of them alone.
（６）Ｎｂは、耐熱疲労性と高温強度を向上させるとともに、ＮｂＣの生成により硬度を高めて耐摩耗性を向上させる効果もあり、ＭｏやＷと同様の効果を期待できる元素であるが、過剰に含有すると延性低下を招くので、含有量を０．２〜０．８mass％（好ましくは０．３〜０．７mass％）とした。 (6) Nb is an element that can improve heat fatigue resistance and high temperature strength, and also has an effect of increasing hardness by improving the wear resistance by generating NbC, and can be expected to have the same effect as Mo and W. When it contains excessively, ductility fall will be caused, Therefore Content was made into 0.2-0.8 mass% (preferably 0.3-0.7 mass%).
本発明のシンターケーキ支持スタンド用特殊鋼は、上述したように、従来の０．２Ｃ−１３Ｃｒ系材料をベースとして、Ｃ含有量を変化させずに、Ｍｏ、Ｗ、Ｎｂのうちの少なくとも１種を適量添加することにより、耐熱疲労性と高温強度を向上させるとともに、硬度を高めて耐摩耗性を向上させたものである。従って、この特殊鋼をスタンドの材料として用いれば、割れが発生しにくく、かつ従来の０．２Ｃ−１３Ｃｒ系材料で形成したものよりも摩耗の進行が遅いスタンドを形成でき、スタンド交換周期を長くすることができる。その結果、新品スタンドの製作費やスタンド交換作業の労務費の減少によりメンテナンスコストの削減が図れるし、スタンド交換作業のために焼結機全体を休止させる時間が短縮されるので、焼結鉱の生産性を向上させることもできる。 As described above, the special steel for the sinter cake support stand according to the present invention is based on the conventional 0.2C-13Cr material, and at least one of Mo, W, and Nb without changing the C content. By adding an appropriate amount, the heat fatigue resistance and the high temperature strength are improved, and the hardness is increased to improve the wear resistance. Therefore, if this special steel is used as the material for the stand, it is possible to form a stand that is less prone to cracking and that is slower in wear than the conventional 0.2C-13Cr-based material, and the stand replacement cycle is extended. can do. As a result, the maintenance cost can be reduced by reducing the production cost of the new stand and the labor cost of the stand replacement work, and the time for stopping the entire sintering machine for the stand replacement work is shortened. Productivity can also be improved.
以下、本発明の実施形態を説明する。表１は、実施形態の特殊鋼（実施例１〜５）、添加元素の含有量が前述の上限値または下限値を外れた特殊鋼（比較例１〜４）および従来の０．５Ｃ−１３Ｃｒ系材料（従来例）の組成を示し、表２は、表１の各材料の７００℃（使用条件に近いと考えられる温度）でのシャルピー衝撃値、硬度および０．２％耐力の測定結果を示す。シャルピー衝撃試験はＪＩＳＺ ２２４２に準拠し、試験片はＶノッチシャルピー試験片を用いた。表２から、各実施例は、従来例に比べると、いずれも７００℃での硬度および０．２％耐力では劣るが（実施例４、５の硬度を除く）、シャルピー衝撃値では大幅に上回っており、従来例よりも割れを生じにくいものであることがわかる。一方、比較例１〜３は、７００℃での硬度が従来例および各実施例よりも低いため耐摩耗性が低下し、比較例４は、７００℃でのシャルピー衝撃値が従来例に近いため割れの可能性が高まることがわかる。 Embodiments of the present invention will be described below. Table 1 shows the special steel (Examples 1 to 5) of the embodiment, the special steel in which the content of the additive element deviates from the above upper limit value or the lower limit value (Comparative Examples 1 to 4), and the conventional 0.5C-13Cr. Table 2 shows the composition of the system material (conventional example), and Table 2 shows the measurement results of Charpy impact value, hardness and 0.2% proof stress at 700 ° C. (temperature considered to be close to the use conditions) of each material in Table 1. Show. The Charpy impact test was based on JISZ 2242, and a V-notch Charpy test piece was used as the test piece. From Table 2, each example is inferior in hardness at 700 ° C. and 0.2% yield strength (excluding the hardness in Examples 4 and 5) compared to the conventional example, but significantly exceeds the Charpy impact value. It can be seen that cracking is less likely to occur than in the conventional example. On the other hand, Comparative Examples 1 to 3 have lower wear resistance because the hardness at 700 ° C. is lower than that of the conventional example and each example, and Comparative Example 4 has a Charpy impact value at 700 ° C. close to that of the conventional example. It turns out that the possibility of a crack increases.
次に、表１中の各実施例および従来例の特殊鋼を用いて図１に示すシンターケーキ支持スタンド１を形成した。このスタンド１は、台形板状の本体部２とその下部に連続する取付部３とからなり、図２に示すように、一般的な焼結鉱製造工程（図３参照）の焼結機の焼結パレット１９上に２〜４列配置される（図２は２列配置の例）。本体部２の高さは３００ｍｍであり、この本体部２が焼結パレット１９上に形成されて平均６００ｍｍ程度の高さとなる焼結原料層２０に埋没し、焼結原料層２０の上層部の焼結により生成したシンターケーキを支持するようになっている。
Next, the sinter cake support stand 1 shown in FIG. 1 was formed using the special steels of the examples and conventional examples in Table 1. The
このスタンド１を図２に示した設置状態で連続使用して、摩耗の進行速度を調査する実験を行った。各実施例の特殊鋼で形成したスタンドは、実験開始から約３年経過後の調査では、その高さ方向の減肉量が従来例の特殊鋼で形成したスタンドよりも２割程度少なくなっており、実験終了まで割れも目立った変形も発生しなかった。これにより、各実施例の特殊鋼でスタンドを形成すれば、従来よりもスタンドを長寿命化できることが確認された。
The
１ スタンド
２ 本体部
３ 取付部
１１、１２、１３、１４ ホッパー
１５ ミキサー
１６ サージホッパー
１７ ドラムフィーダー
１８ シュート
１９ 焼結パレット
２０ 焼結原料層
２１ 点火炉
DESCRIPTION OF
Claims (2)
Ｃ：０．１〜０．４mass％、Ｓｉ：０．２〜２．０mass％、Ｍｎ：０．１〜１．５mass％、Ｃｒ：１１〜１５mass％を含有するとともに、
Ｍｏ：０．２〜０．８mass％と、Ｗ：０．５〜１．５mass％と、Ｎｂ：０．２〜０．８mass％のうちの少なくとも１種を含有し、
残部がＦｅおよび不可避的不純物からなるシンターケーキ支持スタンド用特殊鋼。 Used as a material for the sinter cake support stand installed on the sintering pallet of the lower suction type sintering machine,
C: 0.1 to 0.4 mass%, Si: 0.2 to 2.0 mass%, Mn: 0.1 to 1.5 mass%, Cr: 11 to 15 mass%,
Mo: 0.2-0.8 mass%, W: 0.5-1.5 mass%, Nb: containing at least one of 0.2-0.8 mass%,
A special steel for a sinter cake support stand with the balance being Fe and inevitable impurities.
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| JP2002013876A (en) * | 2000-06-29 | 2002-01-18 | Nippon Steel Corp | Stand for supporting sintering cake, method of making the same and method for repairing the same |
| JP2002332859A (en) * | 2001-05-10 | 2002-11-22 | Sogi Kogyo Kk | Exhaust guide assembly for vgs turbocharger with improved high-temperature durability composed of martensitic stainless steel doped with tungsten or the like |
| JP2010201506A (en) * | 2009-02-04 | 2010-09-16 | Tokushu Denkyoku Kk | Composite hardfacing welding wire, sinter cake support stand using the same and downdraft sintering machine |
| WO2011115307A1 (en) * | 2010-03-19 | 2011-09-22 | 新日本製鐵株式会社 | Sinter cake support stand, overlay welding wire and overlay welding metal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4820683B1 (en) * | 1969-11-22 | 1973-06-22 | ||
| JPS5641355A (en) * | 1979-09-10 | 1981-04-18 | Nippon Steel Corp | Noncooled roll |
| JPS62196356A (en) * | 1986-02-20 | 1987-08-29 | Aichi Steel Works Ltd | Martensitic heat-resistant stainless steel |
| JPH11181553A (en) * | 1997-12-19 | 1999-07-06 | Mitsubishi Heavy Ind Ltd | Fin excellent in corrosion resistance and steel material for pinna |
| JP2002013876A (en) * | 2000-06-29 | 2002-01-18 | Nippon Steel Corp | Stand for supporting sintering cake, method of making the same and method for repairing the same |
| JP2002332859A (en) * | 2001-05-10 | 2002-11-22 | Sogi Kogyo Kk | Exhaust guide assembly for vgs turbocharger with improved high-temperature durability composed of martensitic stainless steel doped with tungsten or the like |
| JP2010201506A (en) * | 2009-02-04 | 2010-09-16 | Tokushu Denkyoku Kk | Composite hardfacing welding wire, sinter cake support stand using the same and downdraft sintering machine |
| WO2011115307A1 (en) * | 2010-03-19 | 2011-09-22 | 新日本製鐵株式会社 | Sinter cake support stand, overlay welding wire and overlay welding metal |
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