JP2010201506A - Composite hardfacing welding wire, sinter cake support stand using the same and downdraft sintering machine - Google Patents
Composite hardfacing welding wire, sinter cake support stand using the same and downdraft sintering machine Download PDFInfo
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- JP2010201506A JP2010201506A JP2010021813A JP2010021813A JP2010201506A JP 2010201506 A JP2010201506 A JP 2010201506A JP 2010021813 A JP2010021813 A JP 2010021813A JP 2010021813 A JP2010021813 A JP 2010021813A JP 2010201506 A JP2010201506 A JP 2010201506A
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- sinter cake
- support stand
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- 238000003466 welding Methods 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000005552 hardfacing Methods 0.000 title claims abstract description 7
- 238000005245 sintering Methods 0.000 title claims description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 9
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 19
- 239000002184 metal Substances 0.000 abstract description 19
- 229910052804 chromium Inorganic materials 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 229910052758 niobium Inorganic materials 0.000 abstract description 6
- 238000005253 cladding Methods 0.000 abstract description 5
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 44
- 239000010955 niobium Substances 0.000 description 18
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 239000000047 product Substances 0.000 description 12
- 239000011651 chromium Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- -1 Molybdenum forms carbides Chemical class 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 101150080315 SCS2 gene Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/02—Sintering grates or tables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nonmetallic Welding Materials (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
本発明は、製鉄所における製銑工程に供する焼結鉱を製造するシンターケーキ支持焼結方法に用いるシンターケーキ支持スタンド（以下、適宜「スタンド」と称する。）用の硬化肉盛溶接複合ワイヤ、これを用いたシンターケーキ支持スタンド及び下方吸引式焼結機に関する。 The present invention relates to a cured overlay welding composite wire for a sinter cake support stand (hereinafter referred to as “stand” as appropriate) used in a sinter cake support sintering method for producing a sintered ore to be used in a iron making process in an ironworks, The present invention relates to a sinter cake support stand and a downward suction type sintering machine using the same.
従来、下方吸引式焼結機による焼結鉱製造において、焼結塊（シンターケーキ）の自重でシンターケーキ自体が圧縮されることによる通気性の悪化を防止し生産性を向上させる方法として、断面が台形で高さが２００〜４００ｍｍの板状支持部材（スタンド）を原料充填層に埋設するように垂直に立てて焼結パレットの進行方向と平行に配設する方法がある。例えば、特許文献１では、スタンドの形状及び配置方法を改良し、通気性と排鉱性を改善する方法が開示されている。 Conventionally, in the production of sintered ore by a downward suction type sintering machine, the cross section is used as a method for improving the productivity by preventing the deterioration of the air permeability due to the sintering cake itself being compressed by its own weight. However, there is a method in which a plate-like support member (stand) having a trapezoidal shape and having a height of 200 to 400 mm is vertically arranged so as to be embedded in the raw material packed layer and arranged in parallel with the traveling direction of the sintering pallet. For example, Patent Document 1 discloses a method of improving the shape and arrangement of the stand and improving the air permeability and the excavation property.
また、特許文献２では、スタンドの適切な材料として特殊鋳鋼を採用してスタンドの寿命を延長させる手法が開示されている。 Patent Document 2 discloses a technique for extending the life of a stand by using special cast steel as an appropriate material for the stand.
さらに、特許文献３では、スタンドの上部ブレード部の稜線部及び／又は側面部に耐摩耗肉盛溶接を施すことによってスタンドの寿命のさらなる延長を実現する手法も開示されている。 Further, Patent Document 3 discloses a method for further extending the life of the stand by performing wear-resistant overlay welding on the ridge line portion and / or the side surface portion of the upper blade portion of the stand.
ところで、焼結機パレット内の焼結原料層を焼結する工程で、焼結層内に配設されるスタンドの劣化形態としては、操業上起因する熱サイクルによる割れの発生及び進行の他に、原料の焼成・排出を行うため高温の酸化・硫化雰囲気において焼結鉱と擦れ合うことで生じる腐食及び摩耗がある。 By the way, in the step of sintering the sintering raw material layer in the sintering machine pallet, as a deterioration form of the stand disposed in the sintering layer, in addition to the generation and progress of cracks due to the thermal cycle due to operation In addition, since the raw material is fired and discharged, there is corrosion and wear caused by rubbing with the sintered ore in a high-temperature oxidizing / sulfiding atmosphere.
そこで、スタンドの劣化形態を防止し、さらに寿命を向上させるために、スタンドの上部ブレード部側面上側頂部より面積で高々５０％までの範囲を、予め片面で厚さ２ｍｍ〜１０ｍｍ減肉（スキンカット）せしめ、該減肉（スキンカット）部に肉盛溶接を施して減肉部を消滅せしめる方法が開示されており（例えば、特許文献４参照。）、延命対策として一定の効果をあげている。 Therefore, in order to prevent the deterioration form of the stand and further improve the service life, the range of up to 50% in area from the top of the upper side of the upper blade portion of the stand is reduced to 2 mm to 10 mm in thickness on one side in advance (skin cut) ) Has been disclosed, and a method of applying build-up welding to the thinned portion (skin cut) portion to extinguish the thinned portion (see, for example, Patent Document 4), has a certain effect as a life prolonging measure. .
しかしながら、上記特許文献４の方法で用いられるのは、一般的な高クロム鋳鉄系硬化肉盛溶接複合ワイヤで、１０ｍｍ以上の厚みで肉盛金属の性能を発揮するよう設計されているところ、そのワイヤはスタンド専用の肉盛材料ではないため肉盛部の高温雰囲気での耐摩耗性・耐腐食性に問題がある。 However, the method disclosed in Patent Document 4 is a general high-chromium cast iron-based hardfacing welded composite wire that is designed to exhibit the performance of the surfacing metal with a thickness of 10 mm or more. Since the wire is not a build-up material dedicated to the stand, there is a problem in wear resistance and corrosion resistance in the high-temperature atmosphere of the built-up part.
そこで、本発明は、上記課題に鑑みなされたものであり、スタンドの取り替え周期を延ばしてスタンドの長寿命化を図り、ひいては焼結鉱製造における生産性向上に寄与することができるスタンドを提供することを目的とする。 Therefore, the present invention has been made in view of the above problems, and provides a stand that can extend the stand replacement period to extend the life of the stand and thus contribute to productivity improvement in sinter ore production. For the purpose.
上記の課題を解決するため、本発明に係る下方吸引式焼結機に用いるシンターケーキ支持スタンド用硬化肉盛溶接複合ワイヤは、低炭素鋼フープと充填材からなる、下方吸引式焼結機に用いるシンターケーキ支持スタンド用硬化肉盛溶接複合ワイヤにおいて、上記複合ワイヤが、質量％で、次の成分（Ａ）〜（Ｄ）：（Ａ）Ｃ：３〜６％（Ｂ）Ｓｉ：０．８〜２％（Ｃ）Ｃｒ：２０〜３０％（Ｄ）Ｍｏ：４〜８％を含有し、さらに、次の成分（Ｅ）〜（Ｆ）：（Ｅ）Ｎｂ：３〜８％、かつ、Ｂ：０．４％以下（０を含む）、（Ｆ）Ｎｂ：８％以下（０を含む）、かつ、Ｂ：０．２〜０．４％のいずれかを含有し、残部がＦｅ、Ｍｎ、及び、不可避的不純物からなることを特徴とする。 In order to solve the above-mentioned problems, the hardfacing welded composite wire for a sinter cake support stand used in the lower suction type sintering machine according to the present invention is a lower suction type sintering machine composed of a low carbon steel hoop and a filler. In the cured overlay welding composite wire for a sinter cake support stand to be used, the composite wire is in mass%, and the following components (A) to (D): (A) C: 3 to 6% (B) Si: 0.00. 8 to 2% (C) Cr: 20 to 30% (D) Mo: 4 to 8%, and the following components (E) to (F): (E) Nb: 3 to 8%, and , B: 0.4% or less (including 0), (F) Nb: 8% or less (including 0), and B: 0.2 to 0.4%, with the balance being Fe , Mn, and inevitable impurities.
また、本発明は、下方吸引式焼結機の焼結パレット上に配設され、焼結鉱製造時にシンターケーキを支持するブレード部と、焼結パレットに取り付けるための台座部とを備えるシンターケーキ支持スタンドにおいて、ブレード部の上縁部を減肉して形成される減肉部に、上記の硬化肉盛溶接複合ワイヤを肉盛溶接したことを特徴とするシンターケーキ支持スタンドとして構成してもよい。 Further, the present invention provides a sinter cake provided on a sintering pallet of a downward suction type sintering machine, comprising a blade portion for supporting the sinter cake during the production of the sinter, and a pedestal portion for mounting on the sintering pallet. In the support stand, the thinned portion formed by reducing the thickness of the upper edge of the blade portion may be configured as a sinter cake support stand characterized by overlay welding the above-described cured overlay welding composite wire Good.
これにより、充填材と低炭素鋼フープとからなり、上記の成分を含有する複合ワイヤを肉盛溶接することにより補強されたブレード上部が優れた耐摩耗性及び耐腐食性を発揮するので、スタンドの使用限界までの期間を延ばすことができ、ひいては焼結鉱製造における生産性向上に寄与するスタンドが実現される。 As a result, the upper part of the blade made of the filler and the low-carbon steel hoop and reinforced by overlay welding the composite wire containing the above components exhibits excellent wear resistance and corrosion resistance. Thus, the stand up to the limit of use can be extended, and as a result, a stand that contributes to productivity improvement in the production of sintered ore is realized.
また、前記ブレード部のシンターケーキと接触する上縁部が減肉され、当該減肉された部分周辺に溶接金属が形成されているので、排鉱抵抗の少ない耐摩耗性のスタンドが実現可能となる。 In addition, since the upper edge portion of the blade portion that comes into contact with the sinter cake is thinned and a weld metal is formed around the thinned portion, it is possible to realize a wear-resistant stand with low exhausting resistance. Become.
さらに、本発明は、上記のシンターケーキ支持スタンドが配設された焼結パレットを備えることを特徴とする下方吸引式焼結機として構成してもよい。長寿命化が図られたスタンドを採用することにより、スタンドそのものだけでなく入れ替えコストの低減を図ることができ、ランニングコストに優れた下方吸引式焼結機が実現されることとなる。 Furthermore, this invention may be comprised as a downward suction type sintering machine characterized by providing the sintering pallet by which said sinter cake support stand was arrange | positioned. By adopting a stand having a long life, not only the stand itself but also the replacement cost can be reduced, and a downward suction type sintering machine excellent in running cost can be realized.
本発明に係るスタンドによれば、充填材と低炭素鋼フープとからなり、上記の成分を含有する複合ワイヤを肉盛溶接したブレード上部が優れた耐摩耗性及び耐腐食性を発揮するよう補強されるので、スタンドの寿命を飛躍的に延ばす効果を奏し、焼結鉱製造における生産性の向上に寄与することが可能となる。 According to the stand according to the present invention, the upper part of the blade comprising the filler and the low carbon steel hoop and overlay welded with the composite wire containing the above components is reinforced so as to exhibit excellent wear resistance and corrosion resistance. Therefore, the effect of extending the life of the stand dramatically is achieved, and it is possible to contribute to the improvement of productivity in the production of sintered ore.
以下、本発明に係るスタンドについて図を参照しながら説明する。
図１は、スタンドの素材斜視図、図２は、その肉盛溶接後の正面図、図３は、図２のブレード部上縁部の部分断面図である。
The stand according to the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a stand material, FIG. 2 is a front view after overlay welding, and FIG. 3 is a partial cross-sectional view of an upper edge portion of a blade portion in FIG.
スタンドＳは、下方吸引式焼結機による焼結鉱製造時に焼結パレット内の焼結原料層の通気性を確保するために、焼結パレット上に装着されてシンターケーキを支持する部材であり、ステンレス鋳鋼（ＳＣＳ２）、オーステナイト系鋳鋼又はフェライト系とオーステナイト系の二相系鋳鋼の材質で形成されており、シンターケーキを支持するブレード部１と、パレット台車に取り付けるための台座部２とから構成されている。なお、ブレード部１の中央下部の矢印はシンターケーキの進行方向を示すものである。 The stand S is a member that is mounted on the sintering pallet and supports the sinter cake in order to ensure the air permeability of the sintering raw material layer in the sintering pallet when the sintered ore is manufactured by the downward suction type sintering machine. , Formed of stainless steel (SCS2), austenitic cast steel or ferritic and austenitic duplex cast steel, and includes a blade portion 1 for supporting a sinter cake and a pedestal portion 2 for mounting on a pallet truck. It is configured. In addition, the arrow at the lower center of the blade part 1 indicates the traveling direction of the sinter cake.
ブレード部１は、焼結原料層の下層の通気性を維持するためにシンターケーキを支持するので、シンターケーキと接触する部分となる上縁部、すなわち略台形状の上辺部と両斜辺部を補強する必要がある。そのため、ブレード部１の上縁部及び両面（図２の手前側の面と奥側の面）がスキンカットされて減肉部３が形成され、この減肉部３に低炭素鋼フープと充填材からなる複合ワイヤを肉盛溶接することにより溶接金属４（図２のクロス斜線で示した部分）が形成されている。 Since the blade portion 1 supports the sinter cake in order to maintain the air permeability of the lower layer of the sintering raw material layer, the upper edge portion that is a portion in contact with the sinter cake, that is, the upper side portion and both oblique sides of the substantially trapezoidal shape are provided. It needs to be reinforced. Therefore, the upper edge and both surfaces of the blade portion 1 (the front side surface and the back side surface in FIG. 2) are skin-cut to form a thinned portion 3, and the thinned portion 3 is filled with a low carbon steel hoop. A weld metal 4 (portion shown by cross diagonal lines in FIG. 2) is formed by overlay welding a composite wire made of a material.
また、溶接金属４は、ブレード部１の中央付近で進行方向手前側の肉盛部分が増えるように段差をつけて形成されている。 Further, the weld metal 4 is formed with a step so as to increase the near-center portion on the front side in the traveling direction near the center of the blade portion 1.
低炭素鋼フープには、JIS G3141に規定されている冷間圧延鋼帯SPCCを用いる。
このフープを筒状としたものに、複合ワイヤの成分が、Ｃ（炭素）：３〜６質量％、Ｓｉ（シリコン）：０．８〜２質量％、Ｃｒ（クロム）：２０〜３０質量％、Ｍｏ（モリブデン）：４〜８質量％となり、さらに、Ｎｂ（ニオブ）：３〜８質量％、かつ、Ｂ（ボロン）：０．４質量％以下（０を含む）、又は、Ｎｂ：８質量％以下（０を含む）、かつ、Ｂ：０．２〜０．４質量％のいずれかが満たされ、残部がＦｅ（鉄）、Ｍｎ（マンガン）、不可避的不純物（例えば、Ｐ（リン）、Ｓ（硫黄）等）となるように、充填材の量を調整し充填する。充填材としては、上記の必要成分が含まれるフェロアロイ、カーバイド等を適宜用いる。Ｍｎの濃度は、フェロアロイ等から持ち込まれる量であれば、スタンドの耐摩耗性及び耐蝕性に影響しないため特に規定しないが、Ｍｎの濃度が突出して高いとコストアップの要因となるので、３質量％以下、さらには１質量％以下とするのが望ましい。
For the low carbon steel hoop, a cold rolled steel strip SPCC specified in JIS G3141 is used.
In this tubular hoop, the composite wire has the following components: C (carbon): 3 to 6% by mass, Si (silicon): 0.8 to 2% by mass, Cr (chromium): 20 to 30% by mass , Mo (molybdenum): 4 to 8% by mass, Nb (niobium): 3 to 8% by mass, and B (boron): 0.4% by mass or less (including 0), or Nb: 8 Less than mass% (including 0) and B: 0.2 to 0.4 mass% is satisfied, and the balance is Fe (iron), Mn (manganese), unavoidable impurities (for example, P (phosphorus)) ), S (sulfur), etc.), and the amount of filler is adjusted and filled. As the filler, ferroalloy, carbide or the like containing the above-mentioned necessary components is appropriately used. The concentration of Mn is not particularly specified as long as it is an amount brought in from ferroalloy or the like, since it does not affect the wear resistance and corrosion resistance of the stand. % Or less, more preferably 1% by mass or less.
上記各成分の数値範囲は次の理由によるものである。 The numerical ranges of the above components are as follows.
炭素は、クロム、モリブデン、ニオブ、ボロン等の炭化物形成元素と結合して高硬度の炭化物を析出し、耐摩耗性の向上に寄与する。但し、ステンレス鋳鋼からの炭素量希釈を考慮して、炭化物の析出と肉盛部の剥離の観点から３〜６質量％の範囲とすることが必要であり、より好ましくは４．５〜５．５質量％である。 Carbon combines with carbide-forming elements such as chromium, molybdenum, niobium, and boron to precipitate high-hardness carbides, contributing to improved wear resistance. However, in consideration of dilution of the carbon amount from the cast stainless steel, it is necessary to set the content in the range of 3 to 6% by mass from the viewpoint of precipitation of carbides and peeling of the built-up portion, and more preferably 4.5 to 5. 5% by mass.
シリコンは、溶接時の脱酸に有効な合金元素である。但し、２質量％よりも多く添加すると溶接金属の靱性を低下させる傾向がある。また、０．８質量％を下回ると、脱酸が不十分となり他元素の析出による効果が得られなくなってしまう。したがって、シリコンは０．８〜２質量％とすることが必要であり、０．８〜１．５質量％とするのが好ましい。 Silicon is an alloy element effective for deoxidation during welding. However, if added in an amount of more than 2% by mass, the toughness of the weld metal tends to be reduced. On the other hand, when it is less than 0.8% by mass, deoxidation is insufficient and the effect of precipitation of other elements cannot be obtained. Therefore, silicon needs to be 0.8 to 2% by mass, and preferably 0.8 to 1.5% by mass.
クロムは、炭素と結合し高硬度のクロム炭化物を析出し、耐摩耗性を増加させると共にこのクロム炭化物が耐食性も有する合金である。溶接金属のクロムの含有量が２０質量％未満では析出する炭化物量が少なく十分な耐摩耗性を発揮することができず、また３０質量％を超えると析出する炭化物量が過多となって溶接金属が脆化するので、ステンレス鋳鋼からのクロム量希釈を考慮して２０〜３０質量％の範囲とすることが必要であり、２１．５〜２５．０質量％とするのが好ましい。 Chromium is an alloy that combines with carbon and precipitates chromium carbide with high hardness to increase wear resistance and also has corrosion resistance. If the chromium content of the weld metal is less than 20% by mass, the amount of precipitated carbide is small and sufficient wear resistance cannot be exhibited, and if it exceeds 30% by mass, the amount of precipitated carbide becomes excessive and the weld metal Is embrittled, it is necessary to set the content in the range of 20 to 30% by mass in consideration of dilution of chromium from the cast stainless steel, and preferably 21.5 to 25.0% by mass.
モリブデンは、炭化物を形成し、高温雰囲気での耐摩耗性を向上させてマトリックスの靱性・耐食性を高める。しかし４質量％未満であれば十分な特性を発揮することができず、８質量％を超えて含有させても添加量に比べてその効果があまり認められなくなるので経済性の面を考慮し、４〜８質量％とすることが必要であり、４．５〜７．０質量％とするのが好ましい。 Molybdenum forms carbides and improves wear resistance in a high-temperature atmosphere, thereby improving the toughness and corrosion resistance of the matrix. However, if it is less than 4% by mass, sufficient characteristics cannot be exhibited, and even if it exceeds 8% by mass, its effect is not recognized much compared to the amount added, so considering the economical aspect, It is necessary to set it as 4-8 mass%, and it is preferable to set it as 4.5-7.0 mass%.
ニオブは、炭素との親和性が高く炭化物を形成し、高温雰囲気での耐摩耗性を向上させる元素である。しかし３質量％未満であれば炭化物の析出量が少なく十分な特性を発揮することができないので、３質量％以上を含有させるのが好ましい。なお、８質量％を超えて含有させても添加量に比べてその効果があまり認められなくなるので経済性の面を考慮すれば３〜８質量％とするのが好ましい。 Niobium is an element that has a high affinity with carbon, forms carbides, and improves wear resistance in a high-temperature atmosphere. However, if the amount is less than 3% by mass, the amount of precipitated carbide is small, and sufficient characteristics cannot be exhibited. Therefore, it is preferable to contain 3% by mass or more. In addition, even if it contains exceeding 8 mass%, since the effect will not be recognized much compared with the addition amount, it is preferable to set it as 3-8 mass% considering the economical aspect.
ボロンは、高硬度のほう化物を析出し、マトリックスを硬化させ耐摩耗性を向上させる有効元素である。また、クロムカーバート等の炭化物の析出を助長させる特徴もある。０．２質量％未満ではその効果が認められず、０．４質量％を超える場合は溶接金属の靱性が劣化するとともに溶接作業性の低下が著しくなるので０．２〜０．４質量％の範囲とするのが好ましい。 Boron is an effective element for precipitating a high-hardness boride, hardening the matrix, and improving wear resistance. In addition, there is a feature that promotes precipitation of carbides such as chrome carbert. If the amount is less than 0.2% by mass, the effect is not recognized. If the amount exceeds 0.4% by mass, the toughness of the weld metal is deteriorated and the weld workability is significantly reduced. The range is preferable.
なお、ニオブとボロンは、共に耐摩耗性を向上させる元素であり、いずれか一方が上記の含有量であれば、もう一方はその上限を超えない範囲で添加すればよい。すなわち、ニオブとボロンの含有量は、Ｎｂ：３〜８質量％、かつ、Ｂ：０．４％質量以下（０を含む）、又は、Ｎｂ：８％質量以下（０を含む）、かつ、Ｂ：０．２〜０．４質量％のいずれかを満たせばよい。 Niobium and boron are both elements that improve the wear resistance. If either one of the above contents is contained, the other may be added within a range not exceeding the upper limit. That is, the content of niobium and boron is Nb: 3 to 8% by mass, and B: 0.4% by mass or less (including 0), or Nb: 8% by mass or less (including 0), and B: Any of 0.2 to 0.4 mass% may be satisfied.
充填材と低炭素鋼フープからなり、上記の成分を含有する複合ワイヤを肉盛溶接して補強を施したブレード部１は、耐摩耗性及び耐腐食性に優れたものとなり、一般的な高クロム鋳鉄系硬化肉盛複合ワイヤで肉盛溶接を施したスタンドの約２倍となり、スタンドの取り替え周期を延ばしてスタンドの長寿命化を図ることが可能となる。 The blade portion 1 made of a filler and a low carbon steel hoop and reinforced by overlay welding a composite wire containing the above components has excellent wear resistance and corrosion resistance, and is generally This is about twice as long as a stand that has undergone overlay welding with a chrome cast iron-based hardfacing composite wire, and it is possible to extend the life of the stand by extending the replacement period of the stand.
また、減肉部３に溶接金属４を形成することにより、補強部分となる溶接金属がスタンド素材より張り出すのを防ぎ排鉱抵抗を少なくしているので、ブレード部１の耐摩耗性をより向上させることができる。 Further, by forming the weld metal 4 in the thinned portion 3, the weld metal serving as the reinforcing portion is prevented from protruding from the stand material, and the resistance to ore removal is reduced, so that the wear resistance of the blade portion 1 is further increased. Can be improved.
また、溶接金属４を、進行方向先側よりも進行方向手前側の肉盛部分が増えるように段差をつけて形成することにより、焼結塊と接触する側の肉盛部分がより増えるので、耐摩耗性及び耐腐食性を高めることができる。 Moreover, since the weld metal 4 is formed with a step so that the build-up portion on the front side in the traveling direction increases from the front side in the travel direction, the build-up portion on the side in contact with the sintered ingot increases, Abrasion resistance and corrosion resistance can be increased.
図１と同一形状のスタンド素材のブレード部に、肉盛材料Ａで肉盛溶接を図２及び図３の要領で行ない、溶接金属を形成した。
なお、肉盛材Ａは、スタンドの溶接金属を形成する肉盛溶接材として従来使用されている、高クロム鋳鉄系の硬化肉盛複合ワイヤである。
一方、図１と同一形状のスタンド素材のブレード部に、肉盛材Ｂ〜Ｒで肉盛溶接を図２及び図３の要領で行い、溶接金属を形成した。なお、肉盛材Ｂ〜Ｒは、充填材と低炭素鋼フープとからなり、上記実施形態で列挙した成分を含有する複合ワイヤである。
また、該ブレード部に形成した減肉部の寸法は、厚さ３ｍｍ、幅は図２中でａ：１５０ｍｍ、ｂ：２００ｍｍ、ｃ：２０ｍｍである。そしてこの減肉部に対して、表１に示す成分の肉盛材で減肉厚さと同等の３ｍｍの厚さで肉盛溶接を行った。
これら１６種類のスタンドを試作し、下方吸引式焼結機の焼結パレットに装着した。
この時の焼結機条件は、パレット幅５ｍ、有効面積６６０ｍ２、焼結原料厚７００ｍｍ、パレット速度は４ｍ／分で、生産効率は３２ｔ／ｍ２である。
On the blade portion of the stand material having the same shape as in FIG. 1, build-up welding was performed with the build-up material A as shown in FIGS. 2 and 3 to form a weld metal.
The cladding material A is a high chromium cast iron-based hardfacing composite wire that has been conventionally used as a welding material for forming the weld metal of the stand.
On the other hand, build-up welding was performed on the blade portion of the stand material having the same shape as in FIG. 1 with the build-up materials B to R in the manner shown in FIGS. 2 and 3 to form a weld metal. The build-up materials B to R are composite wires made of a filler and a low carbon steel hoop and containing the components listed in the above embodiment.
In addition, the thickness of the thinned portion formed on the blade portion is 3 mm in thickness and the width is a: 150 mm, b: 200 mm, and c: 20 mm in FIG. 2. Then, build-up welding was performed on the thinned portion with a thickness of 3 mm equivalent to the thinned thickness with the build-up material having the components shown in Table 1.
These 16 kinds of stands were made on a trial basis and mounted on a sintering pallet of a downward suction type sintering machine.
The sintering machine conditions at this time are a pallet width of 5 m, an effective area of 660 m 2 , a sintering raw material thickness of 700 mm, a pallet speed of 4 m / min, and a production efficiency of 32 t / m 2 .
スタンドを設置して半年ごとに摩耗減高さ測定及び損傷状況確認を行い、使用２年迄の結果で判断した。なお摩耗減高さとは、使用期間中に何回か測定した際の高さ方向における減肉長さ（スタンドの台座部から上辺までの高さの減少度合い）である。
素材形状と肉盛材Ａ〜Ｒの組成を表１に、使用２年後の結果を表２に示す。
Table 1 shows the material shape and the composition of the cladding materials A to R, and Table 2 shows the results after 2 years of use.
表１において、肉盛材Ｃは発明品に対するＣ量下限値を外れた例、肉盛材Ｄは発明品に対するＣ量上限値を外れた例、肉盛材Ｅは発明品に対するＳｉ量下限値を外れた例、肉盛材Ｆは発明品に対するＳｉ量上限値を外れた例、肉盛材Ｇは発明品に対するＣｒ量下限値を外れた例、肉盛材Ｈは発明品に対するＣｒ量上限値を外れた例、肉盛材Ｉは発明品に対するＭｏ量下限値を外れた例、肉盛材Ｊは発明品に対するＭｏ量上限値を外れた例、肉盛材Ｌは発明品に対するＮｂ量上限値を外れた例、肉盛材Ｍは発明品に対するＣ量上限値を外れた例、肉盛材Ｎは発明品に対するＳｉ量下限値およびＢ量上限値を外れた例、肉盛材Ｑは発明品に対するＮｂ量下限値およびＢ量下限値を外れた例、肉盛材Ｒは発明品に対するＮｂ量下限値およびＢ量上限値を外れた例である。
また、表２において、好結果肉盛材料は肉盛材Ｂ、肉盛材Ｋ、肉盛材Ｏ、肉盛材Ｐであった。なお、摩耗大・中・小の定義は、取付時の高さに対し７０ｍｍ以上の摩耗を(大)、３０〜７０ｍｍの摩耗を(中)、３０ｍｍ以内の摩耗を(小)と表現している。
In Table 1, the overlay material C is an example that deviates from the lower limit of the C amount for the inventive product, the overlay material D is an example that deviates from the upper limit of the C amount for the inventive product, and the overlay material E is the lower limit of the Si amount for the inventive product. Example of overlaying material, F is an example of deviation from the upper limit of Si amount for the inventive product, The overlaying material G is an example of exceeding the lower limit of Cr amount for the inventive product, and the overlaying material H is the upper limit of Cr amount for the inventive product Example of deviation, overlay material I is an example of deviation from the lower limit of Mo amount for the inventive product, overlay material J is an example of deviation from the upper limit of Mo amount for the inventive product, overlay material L is Nb amount of the inventive product Examples where the upper limit value is deviated, the overlay material M is an example where the C amount upper limit value for the inventive product is deviated, the overlay material N is an example where the Si amount lower limit value and the B amount upper limit value for the inventive product are deviated, and the overlay material Q Is an example that deviates from the lower limit of Nb amount and the lower limit of B amount for the inventive product, and the build-up material R is the lower limit of Nb amount and the upper limit of B amount for the invention Is an example in which out of the.
In Table 2, the successful build-up materials were build-up material B, build-up material K, build-up material O, and build-up material P. The definitions of large, medium and small wear are expressed as 70mm or more wear (large), 30 ~ 70mm wear (medium) and 30mm or less wear (small). Yes.
この試験結果から、図１の素材形状のブレード部に肉盛材Ｂ、Ｋ、Ｏ、Ｐを図２及び図３の要領で肉盛溶接して溶接金属を形成したものが、経済面から耐摩耗性及び耐腐食性に優れ、従来のスタンドの摩耗減高さに対して約４倍の寿命となっていることがわかる。そして、焼結機１設備に多数のスタンドが配設されることに鑑みれば、このスタンドを採用することにより、スタンドそのものだけでなく入れ替えコストの低減を図ることができるので、多大な経済的効果をもたらすことも期待できる。 From this test result, it was found that the weld metal was formed by overlay welding B, K, O, P on the blade portion of the material shape of FIG. It can be seen that the wear and corrosion resistance are excellent, and the life is about four times as long as the wear reduction of the conventional stand. In view of the fact that a large number of stands are disposed in the sintering machine 1 equipment, it is possible to reduce not only the stand itself but also the replacement cost by adopting this stand. Can also be expected to bring
なお、肉盛材Ｊは、Ｍｏ量が本発明で規定する上限値を超えているが、肉盛材Ｊを肉盛溶接して溶接金属を形成したものは、発明例と同様に、耐摩耗性及び耐腐食性に優れている。これは、Ｍｏを多量に添加しても、Ｍｏの添加の効果が飽和するだけであり、耐摩耗性及び耐腐食性に悪影響を与えないからである。しかし、肉盛材Ｊは、Ｍｏが多量に添加されているのでコスト高となる。よって、肉盛材Ｊは、本発明の範囲には含まれない。 The overlay material J has an Mo amount exceeding the upper limit defined in the present invention. However, the weld metal formed by overlay welding the overlay material J is wear resistant as in the invention examples. Excellent in corrosion resistance and corrosion resistance. This is because even if a large amount of Mo is added, the effect of addition of Mo is only saturated, and the wear resistance and corrosion resistance are not adversely affected. However, the build-up material J is expensive because Mo is added in a large amount. Therefore, the cladding material J is not included in the scope of the present invention.
また、肉盛材Ｌについても同様のことがいえる。肉盛材Ｌは、Ｎｂ量が本発明で規定する上限値を超えているが、肉盛材Ｌを肉盛溶接して溶接金属を形成したものも耐摩耗性及び耐腐食性に優れている。Ｎｂを多量に添加しても、Ｎｂの添加の効果が飽和するだけであり、耐摩耗性及び耐腐食性に悪影響を与えないからである。しかし、肉盛材Ｌは、Ｎｂが多量に添加されているのでコスト高となる。よって、肉盛材Ｌは、本発明の範囲には含まれない。 The same can be said for the cladding material L. The build-up material L has an Nb amount exceeding the upper limit specified in the present invention, but the weld metal formed by overlay welding the build-up material L is also excellent in wear resistance and corrosion resistance. . This is because even if Nb is added in a large amount, the effect of addition of Nb only saturates and does not adversely affect wear resistance and corrosion resistance. However, the build-up material L is expensive because Nb is added in a large amount. Therefore, the build-up material L is not included in the scope of the present invention.
本発明は、製鉄所における製銑工程に供する焼結鉱を製造するシンターケーキ支持焼結方法に用いる支持スタンドとして利用することができる。 INDUSTRIAL APPLICABILITY The present invention can be used as a support stand used in a sinter cake support sintering method for manufacturing a sintered ore to be subjected to a iron making process in an ironworks.
１ ブレード部
２ 台座部
３ 減肉部
４ 溶接金属
Ｓ スタンド
1 Blade part 2 Base part 3 Thinning part 4 Weld metal S Stand
Claims (3)
上記複合ワイヤが、質量％で、次の成分（Ａ）〜（Ｄ）：
（Ａ）Ｃ：３〜６％
（Ｂ）Ｓｉ：０．８〜２％
（Ｃ）Ｃｒ：２０〜３０％
（Ｄ）Ｍｏ：４〜８％
を含有し、さらに、次の成分（Ｅ）〜（Ｆ）：
（Ｅ）Ｎｂ：３〜８％、かつ、Ｂ：０．４％以下（０を含む）、
（Ｆ）Ｎｂ：８％以下（０を含む）、かつ、Ｂ：０．２〜０．４％
のいずれかを含有し、
残部がＦｅ、Ｍｎ、及び、不可避的不純物からなることを特徴とする下方吸引式焼結機に用いるシンターケーキ支持スタンド用硬化肉盛溶接複合ワイヤ。 In the hardfacing welded composite wire for the sinter cake support stand used for the downward suction type sintering machine, consisting of a low carbon steel hoop and filler,
The said composite wire is the mass%, and the following component (A)-(D):
(A) C: 3 to 6%
(B) Si: 0.8-2%
(C) Cr: 20-30%
(D) Mo: 4-8%
In addition, the following components (E) to (F):
(E) Nb: 3 to 8% and B: 0.4% or less (including 0),
(F) Nb: 8% or less (including 0), and B: 0.2 to 0.4%
Contains any of
A cured overlay welding composite wire for a sinter cake support stand used in a downward suction type sintering machine, wherein the balance is Fe, Mn, and inevitable impurities.
ブレード部の上縁部を減肉して形成される減肉部に、請求項１記載の硬化肉盛溶接複合ワイヤを肉盛溶接したことを特徴とするシンターケーキ支持スタンド。 In a sinter cake support stand that is disposed on a sintering pallet of a lower suction type sintering machine and includes a blade portion that supports the sinter cake during sinter production, and a pedestal portion that is attached to the sintering pallet.
A sinter cake support stand, wherein the hardened welded composite wire according to claim 1 is build-up welded to a thinned portion formed by thinning the upper edge of the blade portion.
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| JP2016017220A (en) * | 2014-07-10 | 2016-02-01 | 株式会社栗本鐵工所 | Special steel for sinter cake supporting stand |
| US9475154B2 (en) | 2013-05-30 | 2016-10-25 | Lincoln Global, Inc. | High boron hardfacing electrode |
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| JP5539384B2 (en) * | 2010-03-19 | 2014-07-02 | 新日鐵住金株式会社 | Sinter cake support stand, wire for overlay welding and metal for overlay welding |
| CN103447704B (en) * | 2013-01-10 | 2016-03-16 | 芜湖新兴铸管有限责任公司 | A kind of sintering machine head bend renovation technique |
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|---|---|---|---|---|
| JPS61190047A (en) * | 1985-02-19 | 1986-08-23 | コンバツシヨン・エンヂニアリング・インコーポレーテツド | Highly abrasion resistant material |
| JP2000233276A (en) * | 1999-02-09 | 2000-08-29 | Kobe Steel Ltd | Method for multi-layer cladding by welding for high hardness metal of cast iron base material |
| JP2006118769A (en) * | 2004-10-20 | 2006-05-11 | Nippon Steel Corp | Stand for supporting sintering cake |
-
2010
- 2010-02-03 JP JP2010021813A patent/JP5544182B2/en active Active
- 2010-02-04 WO PCT/JP2010/052005 patent/WO2010090339A1/en active Application Filing
- 2010-02-04 BR BRPI1007911-4A patent/BRPI1007911B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61190047A (en) * | 1985-02-19 | 1986-08-23 | コンバツシヨン・エンヂニアリング・インコーポレーテツド | Highly abrasion resistant material |
| JP2000233276A (en) * | 1999-02-09 | 2000-08-29 | Kobe Steel Ltd | Method for multi-layer cladding by welding for high hardness metal of cast iron base material |
| JP2006118769A (en) * | 2004-10-20 | 2006-05-11 | Nippon Steel Corp | Stand for supporting sintering cake |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9475154B2 (en) | 2013-05-30 | 2016-10-25 | Lincoln Global, Inc. | High boron hardfacing electrode |
| JP2016017220A (en) * | 2014-07-10 | 2016-02-01 | 株式会社栗本鐵工所 | Special steel for sinter cake supporting stand |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI1007911A2 (en) | 2017-06-06 |
| BRPI1007911B1 (en) | 2018-04-03 |
| JP5544182B2 (en) | 2014-07-09 |
| WO2010090339A1 (en) | 2010-08-12 |
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