WO2011115307A1 - シンターケーキ支持スタンド、肉盛溶接用ワイヤ及び肉盛溶接用金属 - Google Patents
シンターケーキ支持スタンド、肉盛溶接用ワイヤ及び肉盛溶接用金属 Download PDFInfo
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- WO2011115307A1 WO2011115307A1 PCT/JP2011/057488 JP2011057488W WO2011115307A1 WO 2011115307 A1 WO2011115307 A1 WO 2011115307A1 JP 2011057488 W JP2011057488 W JP 2011057488W WO 2011115307 A1 WO2011115307 A1 WO 2011115307A1
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- mass
- support stand
- cake support
- sinter cake
- build
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
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- 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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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- 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
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- 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
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D5/00—Supports, screens, or the like for the charge within the furnace
Definitions
- the present invention is a sinter cake support stand used in a downward suction type sintering machine for producing sintered ore, a build-up welding wire used when forming a build-up weld of this sinter cake support stand, and It relates to overlay welding metal.
- sintered ore obtained by sintering sintered raw materials such as iron-containing raw materials such as powdered iron ore, secondary raw materials such as limestone, and solid fuel such as powdered coke has been used as raw materials to be introduced into the blast furnaces of steelworks. ing.
- the sintering raw material is loaded on the sintering pallet truck, the solid fuel in the surface layer is ignited, and the sintering pallet truck is transported and sucked from below the sintering pallet truck.
- a lower suction type sintering machine is used that advances the firing of the raw material and generates a sinter cake (sintered lump).
- the sintering raw material positioned on the lower side by the dead weight of the sinter cake generated on the upper side in the process of sintering the raw material packed layer in the sintering pallet proceeds. Since it is compressed and the bulk density becomes high, there is a problem that air permeability is lowered and sintering cannot be performed efficiently.
- Patent Document 1 a sintering cake support stand having a substantially trapezoidal plate-shaped cross section parallel to the traveling direction is disposed on a sintering pallet, and sintering of a sintering raw material packed layer filled in the sintering pallet is performed.
- a technique for ensuring air permeability in the lower raw material packed bed by supporting a sinter cake formed on the upper side in the process has been proposed.
- Patent Document 2 proposes a sinter cake support stand manufactured as a single cast part using special cast steel.
- Patent Document 3 proposes a structure in which a separately manufactured lower pedestal portion and an upper blade portion are joined, and overlay welding is performed on the twill lines and side portions of the upper blade portion.
- Patent Document 4 proposes a method in which a side wall of the upper blade portion of the sinter cake support stand is subjected to a thinning process, and the thinned portion is subjected to overlay welding.
- the sinter cake support stand described in Patent Document 2 is made of special cast steel, and the entire sinter cake support stand is integrally formed. For this reason, the manufacturing cost of the sinter cake support stand increases significantly.
- This special cast steel is a cast steel having a carbon content of about 0.3% by mass and a chromium content of about 13% by mass, and has wear resistance, crack resistance, corrosion resistance, etc. in a high temperature atmosphere of 1200 to 1400 ° C. Was insufficient. Further, since the sinter cake support stand is an integrally formed product of the special cast steel, it is necessary to replace the whole even when the upper knitted wear is worn, and maintenance is lacking and the cost is high.
- the present invention has been made in view of the above-described circumstances, and has improved wear resistance, crack resistance, and corrosion resistance to a high-temperature oxidizing / sulfurizing atmosphere in a high-temperature atmosphere at a sintered ore heating temperature of 1200 to 1400 ° C.
- the aim is to obtain an excellent sinter cake support stand. It is another object of the present invention to obtain a build-up welding wire and a build-up welding metal used in the build-up welding portion of the sinter cake support stand.
- the present inventors have found a build-up weld metal that has moderately Cr carbide important for wear resistance while reducing Cr that causes high temperature embrittlement. . Cr improves high temperature oxidation resistance and its carbide improves wear resistance. On the other hand, Cr that cannot be carbonized dissolves in the metal and causes high temperature embrittlement. Therefore, the overlay welding metal which optimized C content, Cr content, etc. was discovered.
- a sinter cake support stand is a sinter cake support stand disposed on a sintering pallet of a lower suction type sintering machine for producing sintered ore, and is placed on the sintering pallet.
- the build-up weld metal constituting the build-up weld is C: 3.0% by mass to 5.0% by mass, Si: 0.8% by mass to 2.0% by mass, Cr: 10% by mass to 15%.
- the sinter cake support stand of (1) is formed in a portion where the build-up welded portion is reduced in thickness by 2 mm or more and 10 mm or less from at least the upper edge portion or the upper surface of the side surface of the sinter cake support stand. It is characterized by that.
- the sinter cake support stand of (1) or (2) is characterized in that the build-up weld is formed so as to eliminate the thinned portion of the sinter cake support stand. .
- the sinter cake support stand according to any one of (1) to (3) has a distance from the top of the sinter cake support stand of the build-up welded portion as compared to the front side in the sintering pallet traveling direction. It is characterized by a long rear side in the direction of travel.
- the build-up welding wire according to the present invention is a build-up welding wire used when forming the build-up weld portion of the sinter cake support stand, and C: 3.3% by mass or more.
- the build-up weld metal according to the present invention is a build-up weld metal used for the build-up weld part of the sinter cake support stand, and C: 3.0% by mass to 5.0% by mass, Si : 0.8% by mass or more and 2.0% by mass or less, Cr: 10% by mass or more and 15% by mass or less, Mo: 7% by mass or more and 10% by mass or less, with the balance being composed of Fe and inevitable impurities It is characterized by that.
- a sinter cake support stand that is excellent in wear resistance, crack resistance, and corrosion resistance in a high temperature oxidation / sulfurization atmosphere in a high temperature atmosphere of 1200 ° C. to 1400 ° C.
- the life of the sinter cake support stand can be greatly extended.
- FIG. 1 is a perspective view of a sinter cake support stand according to an embodiment of the present invention.
- FIG. 2 is a front view of the sinter cake support stand shown in FIG. 3 is a cross-sectional view taken along the line XX in FIG.
- FIG. 4 is a perspective view showing a state before forming a build-up weld in the sinter cake support stand of FIG. 1.
- FIG. 5 is a front view of a sinter cake support stand according to another embodiment of the present invention.
- FIG. 6 is a front view of a sinter cake support stand according to another embodiment of the present invention.
- the sinter cake support stand 10 is disposed on a sintering pallet truck of a downward suction type sintering machine that manufactures sintered ore that is a raw material to be fed into a blast furnace.
- the sinter cake support stand 10 is a member for supporting the sinter cake (sintered lump) generated on the upper side of the raw material packed layer and maintaining the air permeability on the lower side of the sintered raw material packed layer.
- the sinter cake support stand 10 includes a pedestal portion 11 that is fixed to the sintering pallet carriage, and a blade body 16 that extends upward from the pedestal portion 11. Yes.
- the upper edge portion and the upper side surface of the blade body 16 are thinned (skin cut) so that the surface is cut to a depth of 1 to 5 mm, and this thinned portion is provided with a build-up weld.
- the blade body 16 and the build-up welded portion 18 are collectively referred to as a blade portion 15. 1 and 3, the arrow Y displayed at the lower end of the blade portion 15 indicates the traveling direction of the sinter cake support stand 10 and the sintering pallet carriage in the sintering machine.
- the pedestal portion 11 is made of, for example, cast stainless steel (SCS2: martensitic stainless steel specified by JIS 5121), austenitic cast steel, or ferritic and austenitic duplex cast steel, and is attached to a sintered pallet at the bottom.
- a mounting portion 12 is provided.
- the height H2 of the pedestal portion 11 is set within a range of 120 mm ⁇ H2 ⁇ 130 mm.
- the blade portion 15 has a substantially trapezoidal shape in a side view with respect to the traveling direction of the pallet truck from the viewpoint of improving the excavation property.
- the cross section of the blade part 15 in the thickness direction has a tapered shape in which the plate thickness is reduced from the bottom to the top from the viewpoint of improving the excavation property.
- the height H1 of the blade portion 15 is set in a range of 300 mm ⁇ H1 ⁇ 450 mm, and the thickness T of the blade portion 15 is set in a range of 30 mm ⁇ T ⁇ 70 mm. Has been.
- the blade body 16 is made of, for example, stainless cast steel (SCS2), austenitic cast steel, or a ferritic and austenitic duplex cast steel, and is integrally formed with the pedestal 11 in this embodiment. Has been.
- a thinned portion (skin cut) 17 is formed on the upper edge of the blade body 16 (upper and lower sides of the trapezoid) and the surface layer of the trapezoidal surface. ing.
- the area of the thinning portion 17 on the trapezoidal surface side is larger in the rear (arrow Y backward direction) side portion than in the traveling direction front (arrow Y forward direction) side portion of the sinter cake support stand 10. It is formed as follows. Then, build-up welding is performed so as to fill the thinned portion 17, and a build-up weld portion 18 is formed.
- the build-up weld 18 is formed by performing build-up welding with the build-up welding wire containing the build-up welding metal with respect to the above-described thinned portion 17.
- the thickness t1 of the build-up welded portion 18 of the thinned portion 17 on the upper edge portion (the trapezoidal upper side portion and the oblique side portion) of the blade portion 15 substantially corresponds to the depth on one side of the thinned portion 17. It is set within a range of 2 mm ⁇ t1 ⁇ 4 mm.
- the thickness t2 of the build-up welded portion 18 of the reduced thickness portion 17 on the trapezoidal surface layer portion side is set within a range of 2 mm ⁇ t2 ⁇ 4 mm, which corresponds to the depth of one side of the reduced thickness portion 17. Yes.
- This build-up weld 18 is a part where the heated sintered ore (sinter cake) during the direct contact is in contact, and also a part where the discharged sintered ore collides. Therefore, in order to obtain a sinter cake support stand excellent in abrasion resistance, crack resistance and corrosion resistance in a high temperature oxidation / sulfurization atmosphere in a high temperature atmosphere at a temperature of 1200 ° C. to 1400 ° C., which is a problem to be solved by the present invention. The most important part.
- a weld metal constituting the build-up weld (hereinafter referred to as build-up weld metal) is: It has been found that the following composition is required.
- (C: carbon) C is an element that combines with Cr or the like to form carbides and has the effect of improving high temperature strength and wear resistance.
- the content of C is less than 3.0%, carbides cannot be generated sufficiently, and the above-described effects cannot be achieved.
- the C content exceeds 5.0%, excessive carbides exist, and the build-up weld 18 may be peeled off from the blade body 16.
- the C content is set to 3.0% to 5.0%. In order to surely obtain the effect, it is preferably 3.3% or more and 4.7% or less, and more preferably 3.5% or more and 4.5% or less.
- Si silicon
- Si is an element effective for deoxidation when performing overlay welding. Moreover, it has the effect
- the Si content is set to 0.8% or more and 2.0% or less. In order to surely obtain the effect, it is preferably 1.0% or more and 1.8% or less, and more preferably 1.2% or more and 1.6% or less.
- (Cr: Chrome) Cr is an element that combines with carbon to produce high-hardness Cr carbide and improves the wear resistance and high-temperature strength. Moreover, it has the effect
- the content of Cr is less than 10%, Cr carbide cannot be generated sufficiently, and the above-described effects cannot be achieved.
- the content of Cr exceeds 15%, Cr carbide is excessively present, and the build-up welded portion 18 becomes brittle, and the crack resistance may be greatly reduced.
- the Cr content is set to 10% or more and 15% or less. In order to obtain the effect with certainty, it is preferably 10.5% or more and 14.5% or less, and more preferably 11.0% or more and 14.0% or less.
- Mo Molybdenum
- Mo Mo is an element having a function of improving the strength, wear resistance, and toughness by dissolving in the matrix of the overlay weld metal.
- the Mo content is set to 7% or more and 10% or less. In order to surely obtain the effect, it is preferably 7.5% or more and 9.5% or less, and more preferably 8.0% or more and 9.0% or less.
- P, S, etc. are mentioned as an unavoidable impurity. These inevitable impurities are preferably 0.06% or less in total.
- the blade main body constituting the sinter cake support stand of the present invention is, for example, stainless cast steel (SCS2: martensitic stainless steel defined by JIS 5121), austenitic cast steel, or ferritic and austenitic dual-phase cast steel. Is used.
- SCS2 martensitic stainless steel defined by JIS 5121
- austenitic cast steel or ferritic and austenitic dual-phase cast steel. Is used.
- the present inventors set the component composition of the overlay welding wire to C: 3.3% to 5.5%, Si: 0.9% to 2. It was found that 2% or less, Cr: 11% or more and 17% or less, Mo: 8% or more and 11% or less, and the balance may be Fe and inevitable impurities.
- the reason for limitation of each component element of the overlay welding wire is the same as the component element of the overlay welding metal.
- the overlay welded portion 18 is formed on the upper edge portion of the blade portion 15 and the surface layer portion of the trapezoidal surface of the side surface by the sinter cake support stand 10, the overlay welding wire and the overlay weld metal according to the present embodiment. Since it is formed, it is excellent in wear resistance, crack resistance and corrosion resistance in a high temperature atmosphere of 1200 to 1400 ° C. at the time of sintering. Therefore, early deterioration of the blade portion 15 can be suppressed, and the service life of the sinter cake support stand 10 can be greatly extended.
- the thinned portion 17 is formed on the upper edge portion and the upper portion of the side surface of the blade body 16, and the build-up weld portion 18 is formed so as to fill the portion. Therefore, the built-up weld 18 does not protrude from the stand, and the sinter cake can be discharged smoothly.
- the thinned portion 17 on the side surface (trapezoidal surface side) of the sinter cake support stand is formed so that the area of the rear side portion in the traveling direction is larger than the front side portion in the traveling direction of the sinter cake support stand 10,
- the overlay welding part 18 is formed according to this.
- the rear side portion in the traveling direction of the sinter cake support stand 10 is in sliding contact with the sinter cake for a long time. Therefore, it is possible to reliably suppress wear of the sinter cake support stand 10 by configuring the build-up welded portion 18 at the rear side portion in the traveling direction to be large.
- the shape of the thinned portion on the side of the sinter cake support stand (corresponding to the hatched portion in FIG. 2) is not particularly limited.
- the thinning width b from the upper side of the side trapezoidal shape of the front side portion in the traveling direction is shorter than the thinning width a from the upper side of the side trapezoidal shape of the front side portion in the traveling direction (a> It may be a stepped shape as shown in b).
- the shape which spreads as it goes back may be sufficient like FIG.
- the thickness reduction from the upper side of the side trapezoidal shape may be constant. However, in consideration of the wear form in actual operation, it is preferable to increase the thickness reduction behind the front.
- the present invention is not limited to this and does not depart from the technical idea of the invention.
- the range can be changed as appropriate.
- the shape of the build-up welded portion in the sinter cake support stand is not limited to the shape shown in the present embodiment.
- the shape extends upward from the pedestal portions 111 and 211.
- Sinter cake support stands 110 and 210 in which the built-up welds 118 and 218 are formed on the provided blade bodies 116 and 216 may be used.
- the pedestal portion and the blade main body are described as being integrally molded, but the present invention is not limited to this, and a structure in which the pedestal portion and the blade main body are individually manufactured and joined together may be employed. .
- the structure of the mounting portion of the pedestal portion is not limited to this embodiment, and the design may be changed as appropriate in accordance with the structure of the sintered pallet or the like.
- Overlay welding was performed on the thinned portion of the blade body shown in FIG.
- the blade is made of SCS2, and its component specifications are: C: 0.16-0.24%, Si: ⁇ 1.50%, Mn: ⁇ 1.00%, P: ⁇ 0.040%, S: ⁇ 0.040%, Cr: 11.50 to 14.00%.
- As the overlay welding wire a wire in which the contents of C, Si, Cr, and Mo were adjusted in consideration of dilution of components after welding was used. Table 1 shows the component composition of the weld metal after overlay welding on the blade.
- the component composition of the build-up weld was cut from a range of 1 to 2 mm from the surface of the build-up weld and the chips were analyzed.
- the chips were heated and dissolved in a crucible, the generated gas was burned in an oxygen stream, and the components were measured by a non-dispersive infrared detector.
- components other than C were measured by chemical analysis of chips.
- the composition of the overlay welding metal performed with the overlay welding wire used conventionally was made into the "conventional example.”
- the blade portion height H1 is 300 mm
- the thickness T is 40 mm
- the pedestal portion height H2 is 125 mm.
- the thickness t1 (approximately equivalent to the depth of the thinned portion) t1 of the thinned portion 17 on the upper edge portion (upper side portion and oblique side portion of the trapezoidal side surface) of the blade portion is 3.0 mm
- the thickness t2 (approximately corresponding to the depth of the reduced thickness portion) t2 of the reduced thickness portion 17 on the surface surface layer side was set to 3.0 mm.
- the sinter cake support stand thus obtained was disposed on a sintering pallet of a downward suction type sintering machine having a sintering pallet width of 5 m and an effective area of 660 m 2 . And operation was carried out under conditions of a sintering raw material thickness of 700 mm and a sintering pallet speed of 4 m / min, and the state of wear and cracking due to wear and corrosion were confirmed every three months. The evaluation results are shown in Table 2.
- the amount of wear was calculated from the difference between the initial height measured at the center of the stand with a dedicated jig and the height after use for a predetermined period, and the point of use exceeding 110 mm was defined as the use limit.
- the crack occurrence state is “large” when the crack length measured by the scale is 50 mm or more or the crack opening width is 1.0 mm or more, the length is 20 mm to less than 50 mm, or the crack opening width is 0.
- a sample having a length of less than 5 mm to less than 1.0 mm was defined as “medium”, and a sample having a length of less than 20 mm or a crack opening width of less than 0.5 mm was defined as “small”.
- the wear amount after the use for 48 months is larger than that of the conventional example and the comparative example. It was confirmed that the wear resistance, corrosion resistance, and crack resistance were greatly improved, with the occurrence of cracks being less than 100 mm and less occurrence of cracks, even though they were only moderately small.
- the present invention can be used for the production of blast furnace raw materials for steel. By utilizing the present invention, it is possible to significantly extend the life of the sinter cake support stand in the sintering process of the raw material for steel.
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Abstract
Description
本発明は、これら知見に基づき成されたものであり、その要旨は以下のとおりである。
(2)前記(1)のシンターケーキ支持スタンドは、前記肉盛溶接部が、前記シンターケーキ支持スタンドの少なくとも上縁部または側面上部の表面から2mm以上10mm以下の部分を減肉した部分に形成されたことを特徴としている。
(3)また、前記(1)または(2)のシンターケーキ支持スタンドは、前記肉盛溶接部が、前記シンターケーキ支持スタンドの減肉した部分を消滅させるように形成されたことを特徴としている。
(4)さらに、前記(1)~(3)のいずれか一つのシンターケーキ支持スタンドは、前記肉盛溶接部の前記シンターケーキ支持スタンド頂上部からの距離が、焼結パレット進行方向前側に比べ進行方向後側が長いことを特徴としている。
(5)本発明に係る肉盛溶接用ワイヤは、シンターケーキ支持スタンドの肉盛溶接部を形成する際に使用される肉盛溶接用ワイヤであって、C:3.3質量%以上5.5質量%以下、Si:0.9質量%以上2.2質量%以下、Cr:11質量%以上17質量%以下、Mo:8質量%以上11質量%以下を含み、残部がFeと不可避不純物とからなる組成を有することを特徴としている。
(6)本発明に係る肉盛溶接金属は、シンターケーキ支持スタンドの肉盛溶接部に使用される肉盛溶接金属であって、C:3.0質量%以上5.0質量%以下、Si:0.8質量%以上2.0質量%以下、Cr:10質量%以上15質量%以下、Mo:7質量%以上10質量%以下を含み、残部がFeと不可避不純物とからなる組成を有することを特徴としている。
図2は、図1に示すシンターケーキ支持スタンドの正面図である。
図3は、図2におけるX−X断面矢視図である。
図4は、図1のシンターケーキ支持スタンドにおいて肉盛溶接部を形成する前の状態を示す斜視図である。
図5は、本発明の他の実施形態であるシンターケーキ支持スタンドの正面図である。
図6は、本発明の他の実施形態であるシンターケーキ支持スタンドの正面図である。
シンターケーキ支持スタンド10は、高炉へ投入される原料である焼結鉱を製造する下方吸引式焼結機の焼結パレット台車上に配置される。焼結過程において、シンターケーキ支持スタンド10は、原料充填層上部側に生成したシンターケーキ(焼結塊)を支持し、焼結原料充填層下部側の通気性を維持するための部材である。
以下に、肉盛溶接金属の組成を上記のように限定した理由について説明する。(以下、特に断りの無い限り、成分含有量は質量%で表示する。)
Cは、Cr等と結合して炭化物を形成し、高温強度、耐摩耗性を向上させる作用を有する元素である。
ここで、Cの含有量が3.0%未満では、炭化物を十分に生成させることができず、上述の作用効果を奏功せしめることはできない。一方、Cの含有量が5.0%を超えると、炭化物が過剰に存在してしまい、肉盛溶接部18がブレード本体16から剥離するおそれがある。このような理由から、Cの含有量を3.0%以上5.0%以下に設定している。効果を確実に得るために、好ましくは3.3%以上、4.7%以下とするとよく、更には3.5%以上、4.5%以下とすることが好ましい。
Siは、肉盛溶接を実施する際の脱酸に有効な元素である。また、高温雰囲気下での耐酸化性を向上させる作用を有する。
ここで、Siの含有量が0.8%未満では、上述の作用効果を奏功せしめることはできない。一方、Siの含有量が2.0%を超えると、肉盛溶接部18の靱性が低下するおそれがある。
このような理由から、Siの含有量を0.8%以上2.0%以下に設定している。効果を確実に得るために、好ましくは1.0%以上、1.8%以下とするとよく、更には、1.2%以上、1.6%以下とするとことが好ましい。
Crは、炭素と結合して高硬度のCr炭化物を生成し、耐摩耗性及び高温強度を向上させる作用を有する元素である。また、耐腐食性を向上させる作用を有する。
ここで、Crの含有量が10%未満では、Cr炭化物を十分に生成させることができず、上述の作用効果を奏功せしめることはできない。一方、Crの含有量が15%を超えると、Cr炭化物が過剰に存在してしまい、肉盛溶接部18が脆化し、耐割れ性が大きく低下するおそれがある。
このような理由から、Crの含有量を10%以上15%以下に設定している。効果を確実に得るために、好ましくは10.5%以上、14.5%以下とするとよく、更には、11.0%以上、14.0%以下とするとことが好ましい。
Moは、肉盛溶接金属のマトリックス内に固溶し、強度、耐摩耗性、靱性を向上させる作用を有する元素である。
ここで、Moの含有量が7%未満では、上述の作用効果を奏功せしめることはできない。一方、Moの含有量が10%を超えても、上述の作用効果が向上することがない。
このような理由から、Moの含有量を7%以上10%以下に設定している。効果を確実に得るために、好ましくは7.5%以上、9.5%以下とするとよく、更には、8.0%以上、9.0%以下とするとことが好ましい。
なお、不可避不純物としては、P、S等が挙げられる。これらの不可避不純物は、総量で0.06%以下であることが好ましい。
さらに、台座部の取付部の構造は、本実施形態に限定されることはなく、焼結パレット等の構造に合わせて適宜設計変更してもよい。
図4に示すブレード本体の減肉部に、肉盛溶接を行った。ブレードはSCS2製であり、その成分仕様は、C:0.16~0.24%、Si:~1.50%、Mn:~1.00%、P:~0.040%、S:~0.040%、Cr:11.50~14.00%である。肉盛溶接ワイヤは、溶接後の成分希釈を考慮して、C、Si、Cr、Moの含有量を調整したワイヤを用いた。ブレードに肉盛溶接後の溶接金属の成分組成を表1に示す。肉盛溶接部の成分組成は、肉盛溶接部の表面から1~2mmの範囲を切削してその切り粉を分析した。Cは、切り粉をるつぼで加熱・溶解し、発生したガスを酸素気流中で燃焼させ、非分散赤外線検出器によって成分を測定した。また、C以外の成分は、切り粉の化学分析によって測定した。従来使用していた肉盛溶接ワイヤで行った肉盛溶接金属の組成を「従来例」とした。
ブレード部の上縁部(台形状側面の上辺部及び斜辺部)側の減肉部17の肉盛溶接部の厚さ(おおよそ減肉部の深さに相当する)t1は3.0mm、台形面表層部側の減肉部17の肉盛溶接部の厚さ(おおよそ減肉部の深さに相当する)t2は3.0mmとした。また、図2において、肉盛溶接部の各寸法は、a=150mm、b=200mm、c=20mmとした。
そして、焼結原料厚700mm、焼結パレット速度4m/minの条件で操業を行い、3ヶ月毎に摩耗及び腐食による損耗状況、割れの発生状況について確認した。評価結果を表2に示す。
11 台座部
15 ブレード部
18 肉盛溶接部
Claims (6)
- 焼結鉱を製造する下方吸引式焼結機の焼結パレット上に配置されるシンターケーキ支持スタンドであって、
前記シンターケーキ支持スタンドの少なくとも上縁部または側面上部に肉盛溶接部が設けられており、
この肉盛溶接部を構成する肉盛溶接金属が、C:3.0質量%以上5.0質量%以下、Si:0.8質量%以上2.0質量%以下、Cr:10質量%以上15質量%以下、Mo:7質量%以上10質量%以下を含み、残部がFeと不可避不純物とからなる組成を有することを特徴とするシンターケーキ支持スタンド。 - 前記肉盛溶接部が、前記シンターケーキ支持スタンドの少なくとも上縁部または側面上部の表面から2mm以上10mm以下の部分を減肉した部分に形成されたことを特徴とする請求項1に記載のシンターケーキ支持スタンド。
- 前記肉盛溶接部が、前記シンターケーキ支持スタンドの減肉した部分を消滅させるように形成されたことを特徴とする請求項1または2に記載のシンターケーキ支持スタンド。
- 前記肉盛溶接部の前記シンターケーキ支持スタンド頂上部からの距離が、焼結パレット進行方向前側に比べ進行方向後側が長いことを特徴とする請求項1または2に記載のシンターケーキ支持スタンド。
- シンターケーキ支持スタンドの肉盛溶接を行う際に使用される肉盛溶接用ワイヤであって、
C:3.3質量%以上5.5質量%以下、Si:0.9質量%以上2.2質量%以下、Cr:11質量%以上17質量%以下、Mo:8質量%以上11質量%以下を含み、残部がFeと不可避不純物とからなる組成を有する肉盛溶接金属を備えていることを特徴とする肉盛溶接用ワイヤ。 - シンターケーキ支持スタンドの肉盛溶接を行う際に使用される肉盛溶接金属であって、
C:3.0質量%以上5.0質量%以下、Si:0.8質量%以上2.0質量%以下、Cr:10質量%以上15質量%以下、Mo:7質量%以上10質量%以下を含み、残部がFeと不可避不純物とからなる組成を有することを特徴とする肉盛溶接金属。
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