JP2007107659A - Stainless belt and manufacturing method of same - Google Patents
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- JP2007107659A JP2007107659A JP2005300788A JP2005300788A JP2007107659A JP 2007107659 A JP2007107659 A JP 2007107659A JP 2005300788 A JP2005300788 A JP 2005300788A JP 2005300788 A JP2005300788 A JP 2005300788A JP 2007107659 A JP2007107659 A JP 2007107659A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 239000010935 stainless steel Substances 0.000 claims abstract description 46
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 46
- 238000004881 precipitation hardening Methods 0.000 claims abstract description 14
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 11
- 239000006104 solid solution Substances 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 13
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
Description
本発明は、析出硬化型ステンレス鋼を用いたエンドレスステンレスベルト及びその製造方法に関する。 The present invention relates to an endless stainless steel belt using precipitation hardening stainless steel and a method for producing the same.
従来、高度の硬度、耐力を得るため、エンドレスベルトの原材料として、例えばＳＵＳ６３１のようなセミオーステナイト系析出硬化型ステンレス鋼を採用することが知られている。 Conventionally, in order to obtain a high degree of hardness and yield strength, it is known to employ a semi-austenite precipitation hardening stainless steel such as SUS631 as a raw material for an endless belt.
セミオーステナイト系析出硬化型ステンレス鋼でエンドレスベルトを製造するには、固溶化熱処理、所定長さ幅への切断、溶接によるエンドレスベルト化の後、ベルトを熱処理炉に入れて９５０゜Ｃ前後に加熱してＭｓ点調整をした後、−７３゜Ｃ前後に冷却する、いわゆるサブゼロ処理を行うか、或いは、ベルトに６０％程度の冷間圧延を行い、最後に４８０゜Ｃ前後〜５１０゜Ｃ前後で１時間前後の熱処理を行うというものである。 To manufacture an endless belt with semi-austenitic precipitation hardened stainless steel, solution heat treatment, cutting to a predetermined length and width, forming an endless belt by welding, then placing the belt in a heat treatment furnace and heating to around 950 ° C After adjusting the Ms point, cool to around -73 ° C, so-called sub-zero treatment, or cold-roll the belt about 60%, and finally around 480 ° C to around 510 ° C. The heat treatment is performed for about 1 hour.
しかし、Ｍｓ点調整、サブゼロ処理を行うためには大容量の熱処理炉と冷却装置を必要とするばかりでなく、Ｍｓ点調整によって生じるベルトの寸法変形が＋０．４〜０．６％程度と大きすぎて、到底、実用とはならない。また、エンドレスベルトに６０％程度の冷間圧延を行うことは困難である。 However, in order to perform the Ms point adjustment and the sub-zero treatment, not only a large-capacity heat treatment furnace and a cooling device are required, but also the belt dimensional deformation caused by the Ms point adjustment is as large as about +0.4 to 0.6%. It's too practical to be practical. Moreover, it is difficult to perform cold rolling of about 60% on the endless belt.
さりとて、素材のステンレス鋼に固溶化熱処理、Ｍｓ点調整とサブゼロ処理、或いは、６０％程度の冷間圧延を施し、４８０゜Ｃ前後〜５１０゜Ｃ前後で１時間前後の熱処理を行った後、所定長さ幅への切断、溶接によるエンドレスベルト化を行った場合、溶接の入熱により溶接部において４８０゜Ｃ前後〜５１０゜Ｃ前後で１時間前後の熱処理で生じた析出物が再固溶化し、溶接部分の硬度、耐力が低下するため、エンドレスベルトの溶接部分の強度が非溶接部分と比較して著しく低くなるという欠点があった。 First, the material stainless steel is subjected to solution heat treatment, Ms point adjustment and sub-zero treatment, or cold rolling of about 60%, and after heat treatment at around 480 ° C to around 510 ° C for about 1 hour, When the endless belt is cut by welding to a predetermined length and welded, the precipitate generated by heat treatment at around 480 ° C to around 510 ° C for about 1 hour is re-solidified in the weld due to the heat input of welding. However, since the hardness and proof stress of the welded portion are lowered, there is a drawback that the strength of the welded portion of the endless belt is significantly lower than that of the non-welded portion.
かかる不都合を解消するため、例えば、特開平９−１３３１８４号公報に記載されているように、固溶化処理、薄板への冷間圧延、所定幅への幅断ちの切断加工、所定長さへの切断加工、４００〜６００゜Ｃでの熱処理、補強板を使用しての溶接というエンドレスベルトの製造工程が提案されている。しかし、特開平９−１３３１８４号公報に記載の方法は、補強板により溶接部にも所定の硬度、耐力を得ることができるが、補強板を使用すると、ベルトの厚さが不均等となるので、ベルトの用途が極めて限られてしまい、実用的とはいえなかった。 In order to eliminate such inconvenience, for example, as described in JP-A-9-133184, solution treatment, cold rolling to a thin plate, cutting processing of a width cut to a predetermined width, to a predetermined length An endless belt manufacturing process has been proposed which includes cutting, heat treatment at 400 to 600 ° C., and welding using a reinforcing plate. However, the method described in Japanese Patent Application Laid-Open No. 9-133184 can obtain a predetermined hardness and proof stress in the welded portion by using the reinforcing plate, but if the reinforcing plate is used, the thickness of the belt becomes uneven. The use of the belt was extremely limited and was not practical.
このため、従来、セミオーステナイト系析出硬化型ステンレス鋼によるエンドレスベルトの製造においては、Ｍｓ点調整とサブゼロ処理を行うための大容量の熱処理炉と冷却装置の採用は当然とされ、Ｍｓ点調整によって生じるベルトの寸法変形もやむを得ないものとされ、さらに、溶接時の入熱による溶接部分の硬度、耐力の著しい低下もやむを得ないものとされていた。
そこで、本発明は、溶接部分の強度が非溶接部分と同等かそれ以上であり、均等な厚さを有するステンレスベルトとその製造方法を提供することを目的とするものである。 Accordingly, an object of the present invention is to provide a stainless steel belt having a strength equal to or higher than that of a non-welded part and having a uniform thickness, and a method for manufacturing the same.
また、本発明は、製造に大容量の熱処理炉も冷却装置も不要であり、熱処理による熱歪みによる寸法変化量が小さく、ベルトの形状維持が容易であり、切削研磨その他の仕上げ加工も容易で、製造コストも低廉なステンレスベルトとその製造方法を提供することも目的とするものである。 In addition, the present invention does not require a large-capacity heat treatment furnace or cooling device for production, the amount of dimensional change due to thermal strain due to heat treatment is small, the belt shape is easy to maintain, and cutting and other finishing processes are also easy. Another object of the present invention is to provide a stainless steel belt having a low manufacturing cost and a manufacturing method thereof.
固溶化処理を施したマルテンサイト系析出硬化型ステンレス鋼を適宜長さ適宜幅に切断し、この切断したステンレス鋼を３５０〜６００゜ｃで熱処理して所定の硬度、耐力を得た後、この熱処理したステンレス鋼を溶接してエンドレスベルトを形成すると、エンドレスベルトの溶接部分は溶接の入熱により溶接部分の析出物が再固溶し、溶接部分の硬度、耐力が低下してしまう。硬度、耐力が低下しているのは溶接部分だけで非溶接部分は溶接の入熱の影響を受けないため、所定の硬度、耐力を保持している。本発明は、ベルトの溶接部分を３５０〜６００゜ｃで２０分〜１０時間熱処理し、溶接部分に所定の硬度、耐力を回復させるようにしたものである。 The martensitic precipitation hardening stainless steel subjected to the solution treatment is cut into an appropriate length and an appropriate width, and the cut stainless steel is heat-treated at 350 to 600 ° C. to obtain predetermined hardness and proof stress. When heat-treated stainless steel is welded to form an endless belt, the welded portion of the endless belt re-dissolves precipitates in the welded portion due to the heat input of the welding, and the hardness and proof stress of the welded portion are reduced. The hardness and proof strength are reduced only in the welded portion, and the non-welded portion is not affected by the heat input of the welding, and thus the predetermined hardness and proof strength are maintained. In the present invention, the welded portion of the belt is heat-treated at 350 to 600 ° C. for 20 minutes to 10 hours so that the welded portion is restored to a predetermined hardness and proof stress.
即ち、上記の目的を達成するために、本発明は、固溶化処理と３５０〜６００゜ｃで２０分〜１０時間熱処理を施したマルテンサイト系析出硬化型ステンレス鋼を溶接してエンドレス化し、溶接部分を３５０〜６００゜ｃで２０分〜１０時間熱処理することにより溶接部分及び非溶接部分がほぼ均質な硬度、耐力を有するステンレスベルトを得るようにしたものである。 That is, in order to achieve the above object, the present invention welds martensitic precipitation hardening stainless steel subjected to solid solution treatment and heat treatment at 350 to 600 ° C. for 20 minutes to 10 hours to make it endless, By heat-treating the part at 350 to 600 ° C. for 20 minutes to 10 hours, a stainless steel belt having substantially uniform hardness and proof stress in the welded part and the non-welded part is obtained.
また、上記の目的を達成するために、本発明は、固溶化処理を施したマルテンサイト系析出硬化型ステンレス鋼を適宜長さに切断し、この切断したステンレス鋼を３５０〜６００゜ｃで２０分〜１０時間熱処理し、この熱処理したステンレス鋼を溶接してエンドレスベルトを形成し、このエンドレスベルトの溶接部分を再度３５０〜６００゜ｃで２０分〜１０時間熱処理してステンレスベルトを製造するようにしたものである。 In order to achieve the above object, the present invention cuts the martensitic precipitation hardened stainless steel subjected to the solid solution treatment to an appropriate length, and the cut stainless steel is heated at 350 to 600 ° C. for 20 minutes. Heat treatment is performed for 10 minutes to 10 minutes, the heat-treated stainless steel is welded to form an endless belt, and the welded portion of the endless belt is again heat-treated at 350 to 600 ° C. for 20 minutes to 10 hours to produce a stainless steel belt. It is a thing.
さらに、上記の目的を達成するために、本発明は、固溶化処理を施したマルテンサイト系析出硬化型ステンレス鋼を適宜長さに切断し、この切断したステンレス鋼を溶接してエンドレスベルトを形成し、このエンドレスベルトを所定速度で回転駆動して熱処理炉内を通過させ、３５０〜６００゜ｃで２０分〜１０時間熱処理することにより、３５０〜６００゜ｃで２０分〜１０時間の熱処理を１度ですませてステンレスベルトを製造することもできる。 Furthermore, in order to achieve the above object, the present invention cuts martensite precipitation hardening stainless steel subjected to solution treatment to an appropriate length, and welds the cut stainless steel to form an endless belt. The endless belt is rotated at a predetermined speed and passed through a heat treatment furnace, and heat treatment is performed at 350 to 600 ° C. for 20 minutes to 10 hours, whereby heat treatment at 350 to 600 ° C. is performed for 20 minutes to 10 hours. Stainless steel belts can be manufactured once.
そして、本発明の実施に際しては、３５０〜６００゜ｃで２０分〜１０時間の熱処理を大気又は不活性ガスの雰囲気中で行うことができる。 And when implementing this invention, the heat processing for 20 minutes-10 hours at 350-600 degreeC can be performed in the atmosphere of air or an inert gas.
また、本発明の実施に際しては、エンドレスベルトの溶接部分を３５０〜６００゜ｃで２０分〜１０時間熱処理するにつき、加熱室がエンドレスベルトを挟むことができるように２分割され、かつ、エンドレスベルトに対して離隔、密封可能に配置されている熱処理炉を用いることができる。 In carrying out the present invention, when the welded portion of the endless belt is heat-treated at 350 to 600 ° C. for 20 minutes to 10 hours, the heating chamber is divided into two so as to sandwich the endless belt, and the endless belt It is possible to use a heat treatment furnace disposed so as to be separated and sealable.
尚、マルテンサイト系析出硬化型ステンレス鋼の規格としては、ＳＵＳ６３０、ＡＳＴＭＸＭ−９、ＡＳＴＭＸＭ−１２、ＡＳＴＭＸＭ−１３、ＡＳＴＭＸＭ−１６、ＡＳＴＭＸＭ−２５などが知られているが、そのいずれに属する鋼種のものでも本発明の実施は可能である。ただし、鋼種に応じて熱処理の温度条件が３５０〜６００゜ｃで２０分〜１０時間の範囲内で適宜選択されることはいうまでもない。 In addition, as a standard of martensitic precipitation hardening type stainless steel, SUS630, ASTMXM-9, ASTMXM-12, ASTMXM-13, ASTMXM-16, ASTMXM-25, etc. are known. It is possible to implement the present invention with any type. However, it goes without saying that the temperature condition of the heat treatment is appropriately selected within the range of 20 minutes to 10 hours at 350 to 600 ° C. according to the steel type.
本発明の構成は上記の通りであるから、本発明のステンレスベルトは、溶接部分の強度が非溶接部分と同等かそれ以上であり、しかも、厚さが均等で、鏡面加工も容易である等の効果がある。 Since the configuration of the present invention is as described above, the strength of the welded portion of the stainless steel belt of the present invention is equal to or higher than that of the non-welded portion, and the thickness is uniform and mirror finishing is easy. There is an effect.
また、本発明の製造方法は、ステンレスベルトの製造に大容量の熱処理炉が不要であり、熱処理による熱歪みによる寸法変化量が小さく、その形状維持が容易であり、切削その他の仕上げ加工も容易であり、ステンレスベルトを低廉な製造コストで製造することができる等の効果がある。 In addition, the manufacturing method of the present invention does not require a large-capacity heat treatment furnace for the production of stainless steel belts, the amount of dimensional change due to heat distortion caused by heat treatment is small, its shape can be easily maintained, and cutting and other finishing processes are also easy. Thus, there is an effect that the stainless steel belt can be manufactured at a low manufacturing cost.
以下、図面を参照して本発明の実施の形態を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本発明の製造方法の実施の一形態のフローチャートである図１を参照して本発明の製造方法を説明すると、まず、ＳＵＳ６３０のマルテンサイト系析出硬化型ステンレス鋼のコイルを用意する。このコイルは、製鋼所において既に固溶化処理が施されているものを使用する。鋼種によって固溶化処理の条件は異なることはいうまでもないが、ＳＵＳ６３０の場合の固溶化処理条件は、１０３８±１５゜ｃ×１時間である。必要があれば、このコイルを引き出してテンションレベラーやテンションアニール等で矯正する。次いで、このコイルを引き出して適宜長さ、及び、適宜幅に切断する。切断長さと切断幅は、熱処理炉の寸法にあわせることができる。こうして切断されたステンレス鋼は、適宜の熱処理炉において、大気又は不活性ガスの雰囲気中で、３５０〜６００゜ｃに昇温後、ステンレス鋼の板厚や形状、熱処理炉の構造や効率等を考慮して２０分〜１０時間、望ましくは、１〜４時間保持される。そして、ステンレス鋼は冷却され、所定の硬度、耐力を獲得する。こうして熱処理が終わったステンレス鋼は、所定長さのエンドレスベルトとなるように、適数個両端部において溶接される。このエンドレス溶接による入熱により溶接部分の析出物が再固溶し、エンドレスベルトの溶接部分は硬度、耐力が低下する。しかし、非溶接部分は、溶接部分の幅が極めて狭いため、溶接の入熱の影響を受けず、所定の硬度、耐力を保持している。このエンドレスベルトは、その溶接部分が図３乃至図５に示した再熱処理装置の加熱室に納められ、大気又は不活性ガスの雰囲気中で、３５０〜６００゜ｃに昇温後、ベルトの厚さや形状、熱処理室の構造等を考慮して２０分〜１０時間、望ましくは１時間〜４時間、保持された後、冷却される。この再熱処理により、このエンドレスベルトの溶接部分は所定の硬度、耐力を回復する。最後に、エンドレスベルトは研磨されて鏡面化され、検査されて製品となる。 The manufacturing method of the present invention will be described with reference to FIG. 1 which is a flowchart of one embodiment of the manufacturing method of the present invention. First, a martensitic precipitation hardening stainless steel coil of SUS630 is prepared. As this coil, a coil that has already been subjected to a solution treatment at a steel mill is used. It goes without saying that the solution treatment conditions differ depending on the steel type, but the solution treatment conditions in the case of SUS630 are 1038 ± 15 ° c × 1 hour. If necessary, this coil is pulled out and corrected with a tension leveler or tension annealing. Next, the coil is pulled out and cut into an appropriate length and an appropriate width. The cutting length and cutting width can be matched to the dimensions of the heat treatment furnace. The stainless steel thus cut is heated to 350 to 600 ° C. in an appropriate heat treatment furnace in the atmosphere or in an inert gas atmosphere, and then the thickness and shape of the stainless steel, the structure and efficiency of the heat treatment furnace, etc. Considering 20 minutes to 10 hours, preferably 1 to 4 hours. Then, the stainless steel is cooled to obtain a predetermined hardness and yield strength. The stainless steel after the heat treatment is welded at an appropriate number of both ends so as to form an endless belt having a predetermined length. Due to the heat input by the endless welding, the precipitate in the welded portion is re-dissolved, and the welded portion of the endless belt is reduced in hardness and yield strength. However, since the width of the welded portion is extremely narrow, the non-welded portion is not affected by the heat input of welding and maintains a predetermined hardness and proof stress. This endless belt has its welded portion stored in the heating chamber of the reheat treatment apparatus shown in FIGS. 3 to 5, and after raising the temperature to 350 to 600 ° C. in the atmosphere or in an inert gas atmosphere, In consideration of the sheath shape, the structure of the heat treatment chamber, etc., it is kept for 20 minutes to 10 hours, preferably 1 hour to 4 hours, and then cooled. By this reheat treatment, the welded portion of the endless belt recovers predetermined hardness and proof stress. Finally, the endless belt is polished, mirrored and inspected into a product.
図３乃至図５に示した再熱処理装置を説明すると、図示の装置は幅広のベルト用再熱処理装置であって、断熱材１で形成され、横方向にエンドレスベルト２の幅以上の長さと、縦方向にエンドレスベルト２の溶接部分の幅以上の長さを有する加熱室３が、エンドレスベルト２の溶接部分を挟むことができるように、上半部３ａと下半部３ｂとに２分割され、かつ、図示しない駆動装置によって、上半部３ａと下半部３ｂとがエンドレスベルト２に対して離隔、接近可能に配置されている。加熱室３の上半部３ａと下半部３ｂとには、それぞれエンドレスベルト２の溶接線を挟んで対向するようにヒータ４が適数対挿入設置されている。この対のヒータ４はエンドレスベルト２の幅方向に対して適宜角度を有するように設置されており、また、所定のラップ代で左右位置にあるヒータ４の始部４ａと終部４ｂが重複するように配置されている。加熱室３の上半部３ａの下端面、及び、加熱室３の下半部３ｂの上端面には断熱材であるシール材５が固定されており、エンドレスベルト３が再熱処理される部分を密閉するようになっている。そして、加熱室３の上半部３ａには、セラミック筒６が配置されており、セラミック筒６内には再熱処理温度を制御するための熱電対７が上半部３ａ外がら挿入配置されており、該熱電対７はエンドレスベルト２の溶接線の直上位置まで垂下している。加熱室３には、必要に応じて、脱気手段と、アルゴンガスなどの不活性ガス供給手段が設けられる。 The reheat treatment apparatus shown in FIGS. 3 to 5 will be described. The illustrated apparatus is a wide belt reheat treatment apparatus, which is formed of the heat insulating material 1 and has a length that is equal to or greater than the width of the endless belt 2 in the lateral direction. A heating chamber 3 having a length equal to or greater than the width of the welded portion of the endless belt 2 in the vertical direction is divided into two parts, an upper half 3a and a lower half 3b, so that the welded portion of the endless belt 2 can be sandwiched. And the upper half part 3a and the lower half part 3b are arrange | positioned with respect to the endless belt 2 so that separation | spacing and approach are possible by the drive device which is not shown in figure. An appropriate number of heaters 4 are inserted and installed in the upper half 3a and the lower half 3b of the heating chamber 3 so as to face each other with the welding line of the endless belt 2 interposed therebetween. The pair of heaters 4 are installed so as to have an appropriate angle with respect to the width direction of the endless belt 2, and the start portion 4 a and the end portion 4 b of the heater 4 at the left and right positions overlap each other with a predetermined lap margin. Are arranged as follows. Sealing material 5 as a heat insulating material is fixed to the lower end surface of the upper half 3a of the heating chamber 3 and the upper end surface of the lower half 3b of the heating chamber 3, and a portion where the endless belt 3 is reheated is formed. It is designed to be sealed. And the ceramic cylinder 6 is arrange | positioned in the upper half part 3a of the heating chamber 3, The thermocouple 7 for controlling the reheat processing temperature is inserted and arrange | positioned outside the upper half part 3a in the ceramic cylinder 6. The thermocouple 7 hangs down to a position directly above the weld line of the endless belt 2. The heating chamber 3 is provided with a deaeration unit and an inert gas supply unit such as an argon gas as necessary.
上記の通り、上記の再熱処理装置により、エンドレスベルト２は大気又は不活性ガスの雰囲気中で、３５０〜６００゜ｃに昇温後、左の温度が２０分〜１０時間、望ましくは１時間〜４時間、保持され、加熱室３より取り出され、自然冷却又は強制冷却され、再熱処理され、エンドレスベルト２の溶接部分は所定の硬度、耐力を回復する。 As described above, the endless belt 2 is heated to 350 to 600 ° C. in the atmosphere or inert gas atmosphere by the above-described reheat treatment apparatus, and the left temperature is 20 minutes to 10 hours, preferably 1 hour to It is held for 4 hours, taken out from the heating chamber 3, naturally cooled or forcedly cooled, reheated, and the welded portion of the endless belt 2 recovers a predetermined hardness and yield strength.
続いて、図２を参照して本発明の製造方法の別の実施形態を説明する。 Next, another embodiment of the manufacturing method of the present invention will be described with reference to FIG.
この実施形態は、上記の実施形態が溶接してエンドレスベルトを形成する前後に３５０〜６００゜ｃで２０分〜１０時間熱処理するのと異なり、３５０〜６００゜ｃで２０分〜１０時間の熱処理をエンドレスベルト形成後に一度で行うようにしたものである。 This embodiment is different from the above embodiment in that the heat treatment is performed at 350 to 600 ° C. for 20 minutes to 10 hours before and after forming the endless belt, and the heat treatment at 350 to 600 ° C. for 20 minutes to 10 hours. Is performed once after the endless belt is formed.
即ち、この実施形態は、固溶化処理を施したマルテンサイト系析出硬化型ステンレス鋼のコイルを適宜長さに切断し、この切断したステンレス鋼を溶接してエンドレスベルトを形成し、このエンドレスベルトを所定速度で回転駆動して熱処理炉の加熱室３内を連続的又は断続的に通過させ、加熱室３内で３５０〜６００゜ｃまでに昇温後、左の温度を２０分〜１０時間、望ましくは１時間〜４時間、保持し、冷却するというものである。 That is, in this embodiment, a solid-solution-treated martensite precipitation hardening stainless steel coil is cut to an appropriate length, and the cut stainless steel is welded to form an endless belt. Rotating at a predetermined speed and continuously or intermittently passing through the heating chamber 3 of the heat treatment furnace. After raising the temperature to 350 to 600 ° C. in the heating chamber 3, the left temperature is set to 20 minutes to 10 hours, Preferably, it is held for 1 to 4 hours and cooled.
この実施形態は、エンドレスベルトを回転するためにやや大型の駆動装置を必要とするが、一度の３５０〜６００゜ｃで２０分〜１０時間の熱処理で、エンドレスベルト全体の硬度、耐力を所定の価とすることができる利点がある。 Although this embodiment requires a slightly large drive device to rotate the endless belt, the hardness and proof strength of the entire endless belt can be set to a predetermined value by heat treatment at 350 to 600 ° C. for 20 minutes to 10 hours. There is an advantage that can be made.
最後に、比較試験の結果を表１として示す。表１において、縦軸はビッカース硬さ、横軸は測定距離（単位ｍｍ）、測定距離には６ｍｍの溶接部分を含んでいる。ａは本発明の上記実施例、ｂはエンドレス溶接しただけのマルテンサイト系析出硬化型ステンレス鋼製エンドレスベルト、ｃは従来のセミオーステナイト系析出硬化型ステンレス鋼製エンドレスベルトで溶接によるエンドレス化後に４００〜６００゜Ｃで熱処理したものである。 Finally, the results of the comparative test are shown in Table 1. In Table 1, the vertical axis indicates Vickers hardness, the horizontal axis indicates a measurement distance (unit: mm), and the measurement distance includes a 6 mm welded portion. a is the above-described embodiment of the present invention, b is an endless belt made of martensite precipitation hardening stainless steel only endlessly welded, c is a conventional semi-austenitic precipitation hardening stainless steel endless belt, 400 after endless welding. Heat treated at ~ 600 ° C.
表１に示した如く、ｂ及びｃにおいては溶接部分に大きな硬度低下が認められるが、本発明の上記実施例においては溶接部分に硬度低下は認められない。
１ 断熱材
２ エンドレスベルト
３ 加熱室
３ａ 加熱室の上半部
３ｂ 加熱室の下半部
４ ヒータ
４ａ ヒータの始部
４ｂ ヒータの終部
５ シール材
６ セラミック筒
７ 熱電対
1 Thermal insulation material 2 Endless belt 3 Heating chamber
3a Heating chamber upper half 3b Heating chamber lower half 4 Heater 4a Heater start 4b Heater end 5 Sealing material 6 Ceramic cylinder 7 Thermocouple
Claims (6)
Heat treatment is performed at 350 to 600 ° C. for 20 minutes to 10 hours in a heating chamber of a heat treatment furnace which is divided into two parts and arranged so as to be separated from and sealable with respect to the endless belt so that the endless belt can be sandwiched. The method for producing a stainless steel belt according to any one of claims 3 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005300788A JP2007107659A (en) | 2005-10-14 | 2005-10-14 | Stainless belt and manufacturing method of same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005300788A JP2007107659A (en) | 2005-10-14 | 2005-10-14 | Stainless belt and manufacturing method of same |
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| Publication Number | Publication Date |
|---|---|
| JP2007107659A true JP2007107659A (en) | 2007-04-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013007084A (en) * | 2011-06-23 | 2013-01-10 | Nippon Steel & Sumitomo Metal Corp | Thin steel strip plate and endless steel strip of high strength and high fatigue strength, and method for manufacturing the same |
| JP2013193143A (en) * | 2012-03-16 | 2013-09-30 | Toyota Motor Corp | Method for manufacturing endless metal ring |
| CN105290725A (en) * | 2015-08-05 | 2016-02-03 | 上海罗特钢带有限公司 | Method of preparing high-precision annular grinding mirror surface steel belt |
-
2005
- 2005-10-14 JP JP2005300788A patent/JP2007107659A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013007084A (en) * | 2011-06-23 | 2013-01-10 | Nippon Steel & Sumitomo Metal Corp | Thin steel strip plate and endless steel strip of high strength and high fatigue strength, and method for manufacturing the same |
| JP2013193143A (en) * | 2012-03-16 | 2013-09-30 | Toyota Motor Corp | Method for manufacturing endless metal ring |
| CN105290725A (en) * | 2015-08-05 | 2016-02-03 | 上海罗特钢带有限公司 | Method of preparing high-precision annular grinding mirror surface steel belt |
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