WO2014083587A1 - シンターケーキ支持スタンドの製造方法およびシンターケーキ支持スタンドにおける肉盛溶接方法 - Google Patents
シンターケーキ支持スタンドの製造方法およびシンターケーキ支持スタンドにおける肉盛溶接方法 Download PDFInfo
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- WO2014083587A1 WO2014083587A1 PCT/JP2012/007587 JP2012007587W WO2014083587A1 WO 2014083587 A1 WO2014083587 A1 WO 2014083587A1 JP 2012007587 W JP2012007587 W JP 2012007587W WO 2014083587 A1 WO2014083587 A1 WO 2014083587A1
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- Prior art keywords
- stand
- welding
- sinter cake
- weld metal
- overlay welding
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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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/12—Travelling or movable supports or containers for the charge
Definitions
- the present invention relates to a method for producing 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, and overlay welding in the stand. Regarding the method.
- 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.
- 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 bed and arranged in parallel with the traveling direction of the sintering pallet.
- Patent Document 1 discloses a method of improving the shape and arrangement of the stand and improving the air permeability and the excavation property.
- Patent Document 2 discloses a technique for extending the life of the stand by employing special cast steel as an appropriate material for the stand.
- Patent Document 3 discloses a technique 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.
- the raw material layer in the sintering machine pallet As the deterioration form of the stand disposed in the sintering layer, in addition to the generation and progression of cracks due to the thermal cycle due to operation, the raw material There is corrosion and wear caused by rubbing with sintered ore in a high-temperature oxidation / sulfurization atmosphere for firing and discharging.
- Patent Document 3 cannot be expected to have sufficient corrosion resistance in the built-up portion. Moreover, it cannot be said that it has both wear resistance and corrosion resistance particularly in a high temperature atmosphere.
- an object of the present invention is to provide a stand manufacturing method excellent in wear resistance and corrosion resistance even in a high-temperature atmosphere, and a build-up welding method in the stand.
- a method for producing a sinter cake support stand according to the present invention is provided on a sintering pallet of a downward suction type sintering machine, and has a substantially trapezoidal shape that supports the sinter cake during the production of sintered ore.
- a sinter cake support stand comprising a main body portion and a pedestal portion for mounting on a sintered pallet, the upper edge and both side surfaces of the main body portion of a stand material having a base material of martensitic stainless cast steel Forming a thinned portion by reducing the thickness, a step of preheating the stand material at a temperature of 150 ° C.
- a step of overlay welding a weld metal for each side of the reduced thickness portion formed on the side surface The process of overlay welding the weld metal on each side along the outer periphery of the thinned part, the process of overlay welding the weld metal to the entire end surface of the stand material, and the stand material subjected to overlay welding are gradually performed. Cooling process and Characterized in that it contains.
- the welding conditions for overlay welding the weld metal are a current of 280 to 300 A, a voltage of 28 to 30 V, and a welding speed of 30 to 40 cm / min. It is more preferable to include a step of applying post-heat to the stand material after the step of overlay welding the weld metal on the entire periphery of the end surface of the stand material and before the step of gradually cooling the stand material.
- the stand manufactured in this manner is reinforced by overlay welding at the portion that comes into contact with the sinter cake, and therefore has excellent wear resistance and corrosion resistance in a high temperature atmosphere.
- a stand that uses martensitic stainless cast steel as a base material is prone to cracking of the stand, but in the present invention, the cracking of the stand is prevented by preheating, setting of overlaying conditions, and slow cooling. It is also possible to suppress the occurrence.
- the present invention is provided on a sintering pallet of a downward suction type sintering machine, a substantially trapezoidal main body portion that supports a sinter cake at the time of sinter ore production, and a pedestal portion for attaching to the sintering pallet
- a build-up welding method in a sinter cake support stand in which a thinned portion is formed by thinning the upper edge portion and both side surfaces of a main body portion of a stand material having a base material made of martensitic stainless cast steel.
- the portion in contact with the sinter cake is reinforced by overlay welding, so that a stand excellent in wear resistance and corrosion resistance can be manufactured even in a high temperature atmosphere.
- the life of the stand can be extended by extending the replacement period.
- FIG. 1 is a flowchart showing a stand welding procedure
- FIG. 2 is a front view showing a stand material before overlay welding.
- the stand 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.
- the stand is manufactured by performing overlay welding on a stand material 1 made of martensitic stainless cast steel as a base material, and is composed of a main body portion 2 that supports a sinter cake and a pedestal portion that is attached to a pallet truck. Yes.
- the stand material 1 is preferably a martensite system from the viewpoint of wear resistance.
- a ferrite-type and austenite-type duplex steel material may be used, and a coin overlay layer may be formed on the surface layer.
- the stand material 1 is inspected before overlay welding is performed (step S100).
- the presence or absence of nests or cracks in the stand material 1 is confirmed by visual inspection, the presence or absence of cracks by a penetration depth test, and the presence or absence of distortion at a predetermined location.
- the dimensions of the side wall thinning part 3 formed on the main body part 2 are confirmed.
- the main body 2 supports the sinter cake in order to maintain the air permeability of the lower layer of the sintering raw material layer, so that the upper edge portion that is in contact with the sinter cake, that is, the upper side portion and both oblique sides of the substantially isosceles trapezoid shape Need to be reinforced. Therefore, the side wall thinning portion 3 is formed by skin-cutting the upper edge portion and both surfaces of the main body portion 2 (front surface and back surface in FIG. 2). By welding the weld metal to the side wall thinning portion 3, the stand becomes excellent in wear resistance and corrosion resistance even in a high temperature atmosphere.
- the weld metal is built up to a thickness of 1.5 T to 4 Tmm in a build-up welding process (step S104) to the side wall thinning portion 3 to be described later. It is preferable to weld. This is because if it is less than 1.5 Tmm, it is difficult to obtain an effect of wear resistance and may cause distortion, and if it exceeds 4 Tmm, the stand material 1 may be cracked.
- the side wall thinning portion 3 is provided with a level difference between the left side and the right side in the figure because the sinter cake advances from the left side to the right side in the figure, so Because it is possible to increase the wear resistance and corrosion resistance of the stand by forming a step so that the build-up part on the side increases and making the build-up part on the side in contact with the sintered mass more It is.
- preheating is applied to the stand material 1 (step S102).
- Preheating is performed by heating the stand material 1 at a temperature of 150 to 250 ° C.
- Preheating at a temperature lower than 150 ° C increases the possibility of cracking of the stand. If preheating at a temperature exceeding 250 ° C, the weld metal may become a material and the stand may be deformed. is there. Therefore, it is preferable to control the temperature by measuring the temperature of the central portion of the stand material 1 using a contact thermometer or a temperature choke so that the preheating temperature falls within the above temperature range.
- step S104 build-up welding of the side wall thinning portion 3 is performed (step S104). Overlay welding of the side wall thinning portion 3 is performed 8 to 10 times (8 to 10 passes) for each row from the lower side of the stand material 1, and as shown in FIG. Form. At this time, it is preferable to perform overlay welding by applying a copper plate to the upper portion of the stand material 1 so that the metal to be overlayed does not melt. If the build-up amount per pass is increased too much, the molten metal will fall. Moreover, when the build-up layer per pass is thinned, the crystal becomes finer and the thermal shock resistance is improved. On the other hand, too many passes will hinder productivity. Therefore, a film is formed 8 to 10 times.
- the welding heat input affects the wear resistance and corrosion resistance of the stand after manufacture. If the welding heat input is small, the effects of wear resistance and corrosion resistance cannot be expected. If the welding heat input is large, the thermal stress increases and the occurrence rate of cracks in the stand increases. Therefore, it is preferable that the welding conditions defining the welding heat input are: current: 280 to 300 A, voltage: 28 to 30 V, welding speed: 30 to 40 cm / min.
- the weld metal to be welded is a wire in which alloy powder is packed in a tube, and welding is performed at a temperature of 500 ° C. or less during welding.
- the reason for setting the temperature during welding to 500 ° C. or less is to prevent softening of the built-up portion.
- it is preferable to control the temperature by measuring the temperature of the central portion of the stand material 1 using a contact thermometer or a temperature choke.
- step S106 When the build-up welding of the side wall thinning portion 3 on one surface is performed, the build-up welding of the side wall thinning portion 3 on the opposite surface is performed in the same procedure (step S106).
- the outer circumference of the side wall thinning portion 3, that is, both oblique sides of the stand material 1 having a substantially trapezoidal shape, is built up in one layer, and FIG. As shown, the side surface peripheral welded portion 5 is formed (step S108). At this time, it is preferable to perform overlay welding by applying a copper plate to the oblique side portion of the stand material 1 so that the metal to be overlayed does not melt. Similarly, the outer periphery of the opposite side thinned portion 3 is also welded to form the side outer peripheral welded portion 5 (step S110).
- step S112 After performing build-up welding of the side wall thinning portion 3, build-up is performed on a portion that is not welded (the upper edge of the upper side of the main body 2 and the upper edge of both oblique sides), that is, the entire end surface of the stand material 1.
- Welding is carried out (step S112), and as shown in FIG. 5, end face build-up welds 6, 7, and 8 are formed in the order of end face build-up weld part 6, end face build-up weld part 7, end face build-up weld part 8.
- overlay welding is performed by applying a copper plate to the side surface welded portion 4 or the side surface outer surface welded portion 5 that has already been welded so that the metal to be built up does not melt away. preferable.
- the post-heat is applied to the stand material 1 (Ste S114).
- the post-heating is performed by heating the stand material 1 after overlay welding at a temperature of 250 ° C. or higher. By performing the post-heating, the stand is not easily broken and durability can be improved. In addition, when the temperature of the stand raw material after build-up welding is 250 degreeC or more, it is good also as omitting the process of applying post-heating.
- step S116 the stand material 1 is gradually cooled (step S116), and the shape of the overlaid metal hanging portion is adjusted by a grinder process or the like, and the stand material 1 is inspected for cracking, distortion inspection, and overlaying. After the dimensional inspection of the place, the stand is completed.
- the stand manufactured by the above procedure is excellent in wear resistance and corrosion resistance, and it is possible to extend the life of the stand by extending the replacement period of the stand.
- the present invention can be used as a production method of a support stand used in a sintered cake support sintering method for producing a sintered ore for use in a steelmaking process in an ironworks.
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Abstract
Description
2 本体部
3 側面減肉部
4 側面肉盛溶接部
5 側面外周肉盛溶接部
6,7,8 端面肉盛溶接部
Claims (5)
- 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略台形状の本体部と、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の製造方法であって、
マルテンサイト系ステンレス鋳鋼を母材とするスタンド素材の本体部の上縁部及び両側面を減肉して減肉部を形成する工程と、
スタンド素材に150℃以上の温度で予熱を加える工程と、
側面に形成された減肉部の片面ごとに溶接金属を肉盛溶接する工程と、
減肉部の外周に沿って片面ごとに溶接金属を肉盛溶接する工程と、
スタンド素材の端面全周に溶接金属を肉盛溶接する工程と、
肉盛溶接が施されたスタンド素材を徐冷する工程とを含む
ことを特徴とするシンターケーキ支持スタンドの製造方法。 - 溶接金属を肉盛溶接する際の溶接条件を、電流が280~300A、電圧が28~30V、溶接速度が30~40cm/分の範囲とする
ことを特徴とする請求の範囲第1項に記載のシンターケーキ支持スタンドの製造方法。 - スタンド素材の端面全周に溶接金属を肉盛溶接する工程の後で、スタンド素材を徐冷する工程の前に、
スタンド素材に後熱を加える工程を含む
ことを特徴とする請求の範囲第1項に記載のシンターケーキ支持スタンドの製造方法。 - 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略台形状の本体部と、焼結パレットに取り付けるための台座部とを備え、マルテンサイト系ステンレス鋳鋼を母材とするスタンド素材の本体部の上縁部及び両側面を減肉して減肉部が形成されているシンターケーキ支持スタンドにおける肉盛溶接方法であって、
側面に形成された減肉部の片面ごとに溶接金属を肉盛溶接する工程と、
減肉部の外周に沿って片面ごとに溶接金属を肉盛溶接する工程と、
スタンド素材の端面全周に溶接金属を肉盛溶接する工程とを含む
ことを特徴とするシンターケーキ支持スタンドにおける肉盛溶接方法。 - 側面に形成された減肉部の片面ごとに溶接金属を肉盛溶接する工程において、
減肉部の下方から一列ごとに一層肉盛を行う
ことを特徴とする請求の範囲第4項に記載のシンターケーキ支持スタンドにおける肉盛溶接方法。
Priority Applications (5)
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JP2014549644A JP5851050B2 (ja) | 2012-11-27 | 2012-11-27 | シンターケーキ支持スタンドの製造方法およびシンターケーキ支持スタンドにおける肉盛溶接方法 |
KR1020157014756A KR101673103B1 (ko) | 2012-11-27 | 2012-11-27 | 신터케이크 지지 스탠드의 제조 방법 및 신터케이크 지지 스탠드에 있어서의 육성 용접 방법 |
CN201280077325.9A CN104813130B (zh) | 2012-11-27 | 2012-11-27 | 烧结块支撑台架的制造方法以及烧结块支撑台架中的堆焊方法 |
BR112015011436A BR112015011436B1 (pt) | 2012-11-27 | 2012-11-27 | método de produção de estrado de apoio de bolo sinterizado e método de execução de soldagem com passes transversais para o estrado de apoio de bolo sinterizado |
PCT/JP2012/007587 WO2014083587A1 (ja) | 2012-11-27 | 2012-11-27 | シンターケーキ支持スタンドの製造方法およびシンターケーキ支持スタンドにおける肉盛溶接方法 |
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PCT/JP2012/007587 WO2014083587A1 (ja) | 2012-11-27 | 2012-11-27 | シンターケーキ支持スタンドの製造方法およびシンターケーキ支持スタンドにおける肉盛溶接方法 |
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Citations (2)
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JP2006118769A (ja) * | 2004-10-20 | 2006-05-11 | Nippon Steel Corp | シンターケーキ支持スタンド |
WO2011115307A1 (ja) * | 2010-03-19 | 2011-09-22 | 新日本製鐵株式会社 | 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 |
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JP3151653B2 (ja) | 1995-07-31 | 2001-04-03 | 新日本製鐵株式会社 | シンターケーキ支持スタンド用特殊鋳鋼 |
JP2002013876A (ja) * | 2000-06-29 | 2002-01-18 | Nippon Steel Corp | シンターケーキ支持スタンド、その製造方法及び補修方法 |
JP5490012B2 (ja) * | 2009-04-16 | 2014-05-14 | 新日鐵住金株式会社 | 焼結機 |
CN201645924U (zh) * | 2010-03-08 | 2010-11-24 | 安徽海螺川崎装备制造有限公司 | 一种耐磨件的耐磨结构 |
CN101885100A (zh) * | 2010-07-28 | 2010-11-17 | 上海中船三井造船柴油机有限公司 | 船用柴油机气缸盖的镍铬钼合金自动堆焊工艺方法 |
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- 2012-11-27 WO PCT/JP2012/007587 patent/WO2014083587A1/ja active Application Filing
- 2012-11-27 KR KR1020157014756A patent/KR101673103B1/ko active IP Right Grant
- 2012-11-27 CN CN201280077325.9A patent/CN104813130B/zh active Active
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Patent Citations (2)
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JP2006118769A (ja) * | 2004-10-20 | 2006-05-11 | Nippon Steel Corp | シンターケーキ支持スタンド |
WO2011115307A1 (ja) * | 2010-03-19 | 2011-09-22 | 新日本製鐵株式会社 | 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 |
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CN104813130B (zh) | 2017-05-10 |
JP5851050B2 (ja) | 2016-02-03 |
CN104813130A (zh) | 2015-07-29 |
KR101673103B1 (ko) | 2016-11-04 |
BR112015011436B1 (pt) | 2018-10-09 |
KR20150087263A (ko) | 2015-07-29 |
JPWO2014083587A1 (ja) | 2017-01-05 |
BR112015011436A2 (pt) | 2017-07-11 |
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