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JP2016140907A - Excellent seizure-resistant high-temperature long tube stock conveyance caliber roll - Google Patents

Excellent seizure-resistant high-temperature long tube stock conveyance caliber roll Download PDF

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Publication number
JP2016140907A
JP2016140907A JP2015020831A JP2015020831A JP2016140907A JP 2016140907 A JP2016140907 A JP 2016140907A JP 2015020831 A JP2015020831 A JP 2015020831A JP 2015020831 A JP2015020831 A JP 2015020831A JP 2016140907 A JP2016140907 A JP 2016140907A
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roll
mass
caliber
long tube
temperature long
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雄二郎 岩井
Yujiro Iwai
雄二郎 岩井
公人 白▲崎▼
Kimito Shirasaki
公人 白▲崎▼
誠二 尾▲崎▼
Seiji Ozaki
誠二 尾▲崎▼
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JFE Steel Corp
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a high-temperature long tube stock conveyance caliber roll used for a conveyance device capable of suppressing the occurrence of problems such as seizure or hardening cracks, limited in roll maintenance or exchanging work, and configured to convey a mandrel-rolled long tube stock from a mandrel to a stretch reducer.SOLUTION: The excellent seizure-resistant high-temperature long tube stock conveyance caliber roll is configured by thermally spraying Ni-based self-fluxing alloy powder containing tungsten carbide powder (WC) and then forming thermal sprayed film layer subjected to fusing processing on the caliber surface 2 of a steel roll base material 1. The content of the WC powder is 10 to 99.9 mass %, the Ni-based self-fluxing film layer contains Cr of 12 to 17 mass %, B of 2.5 to 4.0 mass %, Si of 3.5 to 5.0 mass %, C of 0.4 to 0.9 mass %, and Fe of 5.0 mass % or less, and the remaining part has a composition component including Ni and inevitable impurities.SELECTED DRAWING: Figure 1

Description

本発明は、高温長尺素管搬送用カリバーロールに関し、特に、継目無鋼管の製造において、マンドレル圧延された長尺素管をマンドレルミルからストレッチレデューサまで搬送する搬送設備に用いられる高温長尺素管搬送用カリバーロールに関する。   TECHNICAL FIELD The present invention relates to a caliber roll for conveying a high-temperature long element pipe, and in particular, in manufacturing a seamless steel pipe, a high-temperature long element used in a conveying facility for conveying a mandrel-rolled long element pipe from a mandrel mill to a stretch reducer. The present invention relates to a caliber roll for pipe conveyance.

マンネスマンーマンドレルミル方式による継目無鋼管の製造は、例えば図2に示す工程を経て行われる。まず素材であるビレット3が回転炉床式加熱炉4に装入されて加熱され、加熱されたビレット3が穿孔圧延機5で穿孔されて中空素管31となる。次いで、中空素管31は、素管の内部にマンドレルバーと呼ばれる棒状工具7を挿入しつつ複数のロールで圧延を行うマンドレルミル6によって延伸圧延され、所望の外径、肉厚を有する長尺素管32となる。さらに、前記長尺素管32は、必要に応じて再加熱炉8で再加熱され、例えばストレッチレデューサ9と呼ばれる複数スタンドの圧延機で外径加工され、仕上製品管となる。   The manufacture of seamless steel pipes by the Mannesmann-Mandrel mill method is performed, for example, through the steps shown in FIG. First, the billet 3 which is a raw material is charged into the rotary hearth type heating furnace 4 and heated, and the heated billet 3 is pierced by the piercing and rolling mill 5 to become the hollow shell 31. Next, the hollow shell 31 is stretched and rolled by a mandrel mill 6 that performs rolling with a plurality of rolls while inserting a rod-like tool 7 called a mandrel bar into the inside of the blank, and has a long outer diameter and a desired thickness. The raw tube 32 is formed. Further, the long element pipe 32 is reheated in the reheating furnace 8 as necessary, and is subjected to outer diameter processing by, for example, a multi-stand rolling mill called a stretch reducer 9 to become a finished product pipe.

上記継目無鋼管の製造工程では、マンドレルミル6からストレッチレデューサ9までの間には、前記マンドレルバーを長尺素管32から抜き去る作業を行うため、比較的大掛かりな搬送設備10が必要となる。   In the manufacturing process of the seamless steel pipe, since the mandrel bar is removed from the elongated pipe 32 between the mandrel mill 6 and the stretch reducer 9, a relatively large transport facility 10 is required. .

その搬送設備のうち、ランアウトコンベア11、ポジショニングコンベア12、バーストリッパー13、クロップコンベア14等には、長尺素管32の縦及び横送りをするために、多数のカリバーロールが用いられているが、被搬送材である長尺素管32が高温であるため、これらのカリバーロールの材質には耐熱性に優れていることが要求される。そこで、従来より、炭素鋼(S45C)を母材としたロールのカリバー面に耐熱合金を肉盛溶接した肉盛溶接ロール、特許文献1に開示されているような金属性軸体にSiN系の筒状セラミック体を外嵌した二重構造のセラミックロール、または炭素鋼(S45C)を母材としたロールのカリバー面にセラミック系材料を溶射した溶射ロールなどが用いられてきた。   Among the transport facilities, the run-out conveyor 11, the positioning conveyor 12, the burst ripper 13, the crop conveyor 14 and the like use a large number of caliber rolls for vertical and horizontal feed of the long element tube 32. In addition, since the long element pipe 32 which is a material to be transported has a high temperature, the material of these caliber rolls is required to have excellent heat resistance. Therefore, conventionally, a build-up welding roll in which a heat-resistant alloy is build-up welded to a caliber surface of a roll made of carbon steel (S45C) as a base material, a metallic shaft body disclosed in Patent Document 1, and a SiN-based roll. A double-structured ceramic roll with a cylindrical ceramic body fitted externally, or a thermal spray roll in which a ceramic material is sprayed on a caliber surface of a roll made of carbon steel (S45C) as a base material have been used.

特開平10−71413号公報Japanese Patent Laid-Open No. 10-71413

しかしながら、上記肉盛溶接ロールは、高合金継目無鋼管の製造における搬送時には、ロール表面に焼付きや焼割れが高頻度で発生するという問題があった。搬送用のカリバーロールに焼付きや焼割れが発生したまま圧延を継続すると、ロール表面の形状が製品に転写して製品疵の発生などの外面不良となるため、マンドレルミルを停止してロールの手入れ、あるいは交換が必要になり生産性を阻害する要因となっていた。また、上記セラミックロールの場合は、不規則に割れが発生し、ロール交換による生産性の低下およびロールコストの高騰などの問題があった。さらに、上記溶射ロールでは、溶射により形成されたセラミック層が剥離するという問題を抱えていた。   However, the build-up welding roll has a problem that seizure and cracking frequently occur on the roll surface during conveyance in the production of a high alloy seamless steel pipe. If rolling is continued with seizure or cracking on the caliber roll for conveyance, the shape of the roll surface will be transferred to the product and the outer surface will be defective such as generation of product flaws. Maintenance or replacement was required, which hindered productivity. Moreover, in the case of the said ceramic roll, the crack generate | occur | produced irregularly and there existed problems, such as the fall of productivity by roll exchange, and the raise of roll cost. Furthermore, the thermal spray roll has a problem that the ceramic layer formed by thermal spraying is peeled off.

本発明の目的は、焼付きや焼割れ、剥離といった問題の発生を抑制し、ロールの手入れ、あるいは交換作業が少ない、マンドレル圧延された長尺素管をマンドレルミルからストレッチレデューサまで搬送する搬送設備に用いられる高温長尺素管搬送用カリバーロールを提供することである。   The object of the present invention is to suppress the occurrence of problems such as seizure, burn cracking, and peeling, and to transport a mandrel-rolled long element tube from a mandrel mill to a stretch reducer, with less roll maintenance or replacement work. It is to provide a caliber roll for conveying a high-temperature long-sized element tube used in the above.

本発明者らは、前記課題を解決するために鋭意検討した。その結果、高融点で粒度の細かい炭化物粉末を含有する溶射剤を溶射した後、熱処理を施すことで母材と溶射皮膜との結合強度を高めることによって、焼付きや焼割れ、および溶射層の剥離を防止できることを見出し、本発明を完成した。   The present inventors diligently studied to solve the above problems. As a result, after spraying a thermal spraying agent containing carbide powder with a high melting point and fine particle size, by increasing the bond strength between the base material and the thermal spray coating by applying a heat treatment, The inventors found that peeling can be prevented and completed the present invention.

すなわち、本発明は、以下の要旨からなる。
(1) 継目無鋼管の製造において、丸鋼片を穿孔圧延機で穿孔圧延して中空素管とし、該中空素管をマンドレルミルで延伸圧延して長尺素管とした後、該長尺素管を前記マンドレルミルからストレッチレデューサまで搬送する搬送設備用のカリバーロールであって、鋼製ロール基材のカリバー表面に、炭化タングステン(WC)粉末を含有するNi基自溶合金粉末を溶射した後、フュージング処理を施した溶射皮膜層が形成されていることを特徴とする耐焼付き性に優れた高温長尺素管搬送用カリバーロール。
(2) 前記WC粉末の含有量が、10〜99.9質量%であることを特徴とする(1)に記載の耐焼付き性に優れた高温長尺素管搬送用カリバーロール。
(3) 前記Ni基自溶合金は、質量%で、Cr:12〜17%、B:2.5〜4.0%、Si:3.5〜5.0%、C:0.4〜0.9%、Fe:5.0%以下を含有し、残部がNiおよび不可避的不純物からなる成分組成を有するものであることを特徴とする(1)または(2)に記載の耐焼付き性に優れた高温長尺素管搬送用カリバーロール。
That is, this invention consists of the following summaries.
(1) In the production of a seamless steel pipe, a round steel piece is pierced and rolled with a piercing and rolling machine to form a hollow shell, and the hollow shell is drawn and rolled with a mandrel mill to obtain a long blank. A caliber roll for transfer equipment for transferring a raw pipe from the mandrel mill to a stretch reducer, wherein a Ni-based self-fluxing alloy powder containing tungsten carbide (WC) powder is sprayed on a caliber surface of a steel roll base material. Thereafter, a caliber roll for conveying a high-temperature long-sized pipe excellent in seizure resistance, wherein a sprayed coating layer subjected to a fusing treatment is formed.
(2) Content of said WC powder is 10-99.9 mass%, The caliber roll for high temperature long union pipe conveyance excellent in seizure resistance as described in (1) characterized by the above-mentioned.
(3) The Ni-based self-fluxing alloy is in mass%, Cr: 12-17%, B: 2.5-4.0%, Si: 3.5-5.0%, C: 0.4- The seizure resistance according to (1) or (2), comprising 0.9%, Fe: 5.0% or less, and the balance having a component composition comprising Ni and inevitable impurities Excellent caliber roll for transporting high-temperature long tube.

本発明により、マンドレル圧延された長尺素管をマンドレルミルからストレッチレデューサまで搬送する搬送設備に用いられる高温長尺素管搬送用カリバーロールの長寿命化が達成でき、ロールに起因する製品の外面不良率の減少、ロールの手入れや交換作業の減少による製造コストの低減および生産性の大幅な向上が可能となる。   According to the present invention, it is possible to extend the life of a high-temperature long-unit tube caliber roll used in a conveyance facility for conveying a mandrel-rolled long unit tube from a mandrel mill to a stretch reducer, and the outer surface of the product resulting from the roll It is possible to reduce the manufacturing cost and improve the productivity significantly by reducing the defect rate and reducing the maintenance and replacement work of the roll.

本発明に係るカリバーロールの縦断面の模式図である。It is a schematic diagram of the longitudinal cross-section of the caliber roll which concerns on this invention. 継目無鋼管製造ラインの1例を示す模式図である。It is a schematic diagram which shows one example of a seamless steel pipe manufacturing line.

以下、本発明の実施の形態を説明する。   Embodiments of the present invention will be described below.

図1は、本発明に係るカリバーロールの縦断面の模式図である。   FIG. 1 is a schematic view of a longitudinal section of a caliber roll according to the present invention.

本発明における鋼製ロール基材1の材質は、特に限定されるものでないが、搬送用カリバーロールとしての機械的性質や機械加工性を有し、汎用性でコスト面でも有利なS45C(JIS G 4051)などの機械構造用炭素鋼鋼材とすることが好ましい。   The material of the steel roll substrate 1 in the present invention is not particularly limited, but has S45C (JIS G) which has mechanical properties and machinability as a caliber roll for conveyance and is versatile and advantageous in terms of cost. 4051) and the like are preferable.

本発明において、ロールのカリバー表面に溶射皮膜2を形成する溶射材料は、耐摩耗性を確保するため炭化タングステン(WC)粉末を含有するNi基自溶性合金とする。Ni基自溶性合金の基地組織はオーステナイトであり、WC粉末を基地組織中に分散して含有させることにより溶射皮膜全体の耐摩耗性および耐焼付き性が向上する。また、WCの含有量は、10〜99.9質量%とすることが好ましい。WCの含有量が10質量%未満では形成された溶射皮膜の耐摩耗性が不足し、99.9質量%を超えると溶射皮膜の靭性が著しく低下する。溶射方法は、粉末式フレーム溶射とし、溶射皮膜厚さを0.1〜4.0mmとすることが好ましい。   In the present invention, the thermal spray material for forming the thermal spray coating 2 on the caliber surface of the roll is a Ni-based self-fluxing alloy containing tungsten carbide (WC) powder in order to ensure wear resistance. The base structure of the Ni-based self-fluxing alloy is austenite, and the wear resistance and seizure resistance of the entire sprayed coating are improved by containing WC powder dispersed in the base structure. Moreover, it is preferable that content of WC shall be 10-99.9 mass%. When the content of WC is less than 10% by mass, the formed sprayed coating has insufficient wear resistance, and when it exceeds 99.9% by mass, the toughness of the sprayed coating is remarkably lowered. The thermal spraying method is preferably powder flame spraying, and the thermal spray coating thickness is preferably 0.1 to 4.0 mm.

さらに、本発明における溶射皮膜層はフュージング処理が施されたものである。フュージング処理により、溶射皮膜は再溶融されて緻密化するとともに、鋼製ロール基材との界面で溶射皮膜とロール基材とが拡散結合状態となり、溶射皮膜の耐剥離性が著しく向上する。フュージング処理は、大気雰囲気炉で900〜1200℃の温度に加熱して行うことが好ましい。   Furthermore, the thermal spray coating layer in the present invention is subjected to a fusing treatment. By the fusing treatment, the thermal spray coating is remelted and densified, and the thermal spray coating and the roll base material are in a diffusion-bonded state at the interface with the steel roll base material, so that the peel resistance of the thermal spray coating is remarkably improved. The fusing treatment is preferably performed by heating to a temperature of 900 to 1200 ° C. in an air atmosphere furnace.

次に、Ni基自溶性合金の好ましい組成について説明する。以下、含有量の質量%は単に%と記載する。   Next, a preferable composition of the Ni-based self-fluxing alloy will be described. Hereinafter, the mass% of the content is simply described as%.

Cr:12〜17%
Crは、Niに固溶し、且つ表面に酸化物(Cr)を形成して耐食性を向上させる。また、高温での耐摩耗性に優れた炭化物を形成する。Crの量が17%超えでは靭性が低下し、また、12%未満では硬度が低くなるため、12〜17%とするのが好ましい。
Cr: 12-17%
Cr dissolves in Ni and forms an oxide (Cr 2 O 3 ) on the surface to improve the corrosion resistance. In addition, it forms carbides with excellent wear resistance at high temperatures. If the amount of Cr exceeds 17%, the toughness decreases, and if it is less than 12%, the hardness decreases. Therefore, the content is preferably 12 to 17%.

B:2.5〜4.0%
Bは、酸化物(B)を形成し、母相の融点を下げる。また、硬質粒子である炭化物を形成し、耐摩耗性を向上させる。2.5%未満では酸化物の生成が多く、硬度が不十分となり、4.0%超えでは靭性が低下するため、Bの量は2.5〜4.0%にするのが好ましい。
B: 2.5-4.0%
B forms an oxide (B 2 O 3 ) and lowers the melting point of the parent phase. Moreover, the carbide | carbonized_material which is a hard particle is formed, and abrasion resistance is improved. If the amount is less than 2.5%, a large amount of oxide is generated, and the hardness is insufficient. If the amount exceeds 4.0%, the toughness decreases. Therefore, the amount of B is preferably 2.5 to 4.0%.

Si:3.5〜5.0%
Siは、Bと同様に酸化物(SiO)を形成して母相の融点を下げ、炭化物を形成して耐摩耗性を向上させる。3.5%未満では溶融時の流動性が落ち、融点を下げる効果が不十分であり、5.0%超えでは靭性が低下するため、Siの量は3.5〜5.0%にするのが好ましい。
Si: 3.5-5.0%
Si, like B, forms an oxide (SiO 2 ) to lower the melting point of the parent phase, and forms carbides to improve wear resistance. If it is less than 3.5%, the fluidity at the time of melting is lowered and the effect of lowering the melting point is insufficient, and if it exceeds 5.0%, the toughness is lowered, so the amount of Si is made 3.5 to 5.0%. Is preferred.

C:0.4〜0.9%
Cは、Cr、BC、SiC、FeCなどの炭化物を形成し、硬度を向上させる。0.4%未満では硬度が低く、0.9%超えでは靭性が低下するため、Cの量は0.4〜0.9%にするのが好ましい。
C: 0.4-0.9%
C forms carbides such as Cr 2 C 3 , B 4 C, SiC, and Fe 3 C, and improves hardness. If it is less than 0.4%, the hardness is low, and if it exceeds 0.9%, the toughness decreases. Therefore, the amount of C is preferably 0.4 to 0.9%.

Fe:5.0%以下
Feは、固溶体炭化物を形成し、耐摩耗性を向上させる。5.0%超えでは靭性が低下するため、Feの量は5.0%以下にするのが好ましい。また、硬度を高く保持するため、0.5%以上とするのが好ましい。
Fe: 5.0% or less Fe forms solid solution carbides and improves wear resistance. If it exceeds 5.0%, the toughness decreases, so the amount of Fe is preferably 5.0% or less. Moreover, in order to keep hardness high, it is preferable to set it as 0.5% or more.

マンドレルミルからストレッチレデューサまでの間の搬送設備の中で、焼付きの問題が発生する頻度が高いランアウトコンベアとバーストリッパーの搬送用ロールに本発明の高温長尺素管搬送用カリバーロールを採用した結果、焼付き、焼割れ、および溶射皮層の剥離もなく、従来のカリバーロールでは約1.9人×時間/月要していたロール手入れ工数を6ヶ月間ゼロと大幅に削減でき、従来約2%であった外面不良率も6ヶ月間ゼロと大幅に改善できた。   In the transfer equipment from the mandrel mill to the stretch reducer, the caliber roll for high-temperature long-sized tube transfer according to the present invention is adopted for the run-out conveyor and the burst rollper transfer roll, which frequently cause seizure problems. As a result, there is no seizure, burn cracking, and peeling of the thermal sprayed skin layer. With the conventional caliber roll, the roll maintenance process, which took about 1.9 x hours / month, can be greatly reduced to zero for 6 months. The external defect rate, which was 2%, has also improved significantly to zero for 6 months.

1 鋼製ロール基材
2 溶射皮膜
3 ビレット
31 中空素管
32 長尺素管
4 回転炉床式加熱炉
5 穿孔圧延機
6 マンドレルミル
7 マンドレルバー
8 再加熱炉
9 ストレッチレデューサ
10 搬送設備
11 ランアウトコンベア
12 ポジショニングコンベア
13 バーストリッパー
14 クロップコンベア
DESCRIPTION OF SYMBOLS 1 Steel roll base material 2 Thermal spray coating 3 Billet 31 Hollow element pipe 32 Long element pipe 4 Rotary hearth type furnace 5 Punch rolling mill 6 Mandrel mill 7 Mandrel bar 8 Reheating furnace 9 Stretch reducer 10 Conveying equipment 11 Runout conveyor 12 Positioning conveyor 13 Burst ripper 14 Crop conveyor

Claims (3)

継目無鋼管の製造において、丸鋼片を穿孔圧延機で穿孔圧延して中空素管とし、該中空素管をマンドレルミルで延伸圧延して長尺素管とした後、該長尺素管を前記マンドレルミルからストレッチレデューサまで搬送する搬送設備用のカリバーロールであって、鋼製ロール基材のカリバー表面に、炭化タングステン(WC)粉末を含有するNi基自溶合金粉末を溶射した後、フュージング処理を施した溶射皮膜層が形成されていることを特徴とする耐焼付き性に優れた高温長尺素管搬送用カリバーロール。   In the production of seamless steel pipes, round steel pieces are pierced and rolled with a piercing and rolling machine to form hollow shells, and the hollow shells are drawn and rolled with a mandrel mill to make long pipes. A caliber roll for transport equipment for transporting from the mandrel mill to a stretch reducer, wherein a Ni-based self-fluxing alloy powder containing tungsten carbide (WC) powder is sprayed on a caliber surface of a steel roll base material, and then fusing. A caliber roll for conveying high-temperature long-sized pipes having excellent seizure resistance, characterized in that a thermally sprayed coating layer is formed. 前記WC粉末の含有量が、10〜99.9質量%であることを特徴とする請求項1に記載の耐焼付き性に優れた高温長尺素管搬送用カリバーロール。   2. The caliber roll for transporting a high-temperature long-sized element pipe excellent in seizure resistance according to claim 1, wherein the content of the WC powder is 10 to 99.9% by mass. 前記Ni基自溶合金は、質量%で、Cr:12〜17%、B:2.5〜4.0%、Si:3.5〜5.0%、C:0.4〜0.9%、Fe:5.0%以下を含有し、残部がNiおよび不可避的不純物からなる成分組成を有するものであることを特徴とする請求項1または2に記載の耐焼付き性に優れた高温長尺素管搬送用カリバーロール。   The Ni-based self-fluxing alloy is in mass%, Cr: 12-17%, B: 2.5-4.0%, Si: 3.5-5.0%, C: 0.4-0.9 %, Fe: 5.0% or less, and the balance has a component composition consisting of Ni and inevitable impurities, and the high temperature length excellent in seizure resistance according to claim 1 or 2 Caliber rolls for transporting scissors tubes.
JP2015020831A 2015-02-05 2015-02-05 Excellent seizure-resistant high-temperature long tube stock conveyance caliber roll Pending JP2016140907A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113913722A (en) * 2021-09-23 2022-01-11 泰尔(安徽)工业科技服务有限公司 Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113913722A (en) * 2021-09-23 2022-01-11 泰尔(安徽)工业科技服务有限公司 Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof

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