JPH01119628A - Heat treatment method for stainless steel cold rolled strip - Google Patents
Heat treatment method for stainless steel cold rolled stripInfo
- Publication number
- JPH01119628A JPH01119628A JP27345387A JP27345387A JPH01119628A JP H01119628 A JPH01119628 A JP H01119628A JP 27345387 A JP27345387 A JP 27345387A JP 27345387 A JP27345387 A JP 27345387A JP H01119628 A JPH01119628 A JP H01119628A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- steel strip
- carbon
- radiant heat
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 86
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 68
- 239000010935 stainless steel Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 60
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 5
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 24
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000010960 cold rolled steel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ステンレス冷延鋼帯を主として輻射熱により
所定温度に加熱して行う焼鈍において、輻射熱の吸収効
率良く熱処理炉で加熱することのできるステンレス冷延
鋼帯の熱処理方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an annealing method in which cold-rolled stainless steel strip is heated to a predetermined temperature mainly by radiant heat, which can be heated in a heat treatment furnace with high absorption efficiency of radiant heat. The present invention relates to a method for heat treatment of cold-rolled stainless steel strip.
一般にステンレス冷延鋼帯の製造工程においては、圧延
によって起こる加工硬化による加工歪などを除去するた
めに焼鈍工程が酸洗工程を伴って組み込まれており、か
かる焼鈍にはカテナリー炉に代表される連続式加熱装置
が広く使用されている。Generally, in the manufacturing process of cold-rolled stainless steel strip, an annealing process is incorporated together with a pickling process in order to remove work distortion caused by work hardening caused by rolling. Continuous heating devices are widely used.
このような連続式加熱装置は、安価な天然ガス。This kind of continuous heating equipment uses inexpensive natural gas.
軽油９重油等をバーナで燃焼させ、加熱された炉壁、バ
ーナフレーム更には高温の燃焼ガス自体からそれぞれ発
生する輻射熱が主となって鋼帯を加熱するものである。Light oil, heavy oil, etc. is burned in a burner, and the steel strip is mainly heated by radiant heat generated from the heated furnace wall, burner frame, and even the high-temperature combustion gas itself.
このような連続式加熱装置において、ステンレス冷延鋼
帯（以下、ステンレス鋼帯と略記することがある）はそ
の良好な表面光沢のために熱線を反射するので輻射熱の
吸収効率が小さく、昇温に時間がかかつて加熱装置の熱
処理能力が低い、そこでステンレス鋼帯に対する熱処理
能力を向上させるための種々な技術が提案されてきた６
例えば、銅帯を予熱するための予熱部分（予熱帯）を設
ける技術として、廃ガスのみで鋼帯を加熱できる予熱帯
域を設けた銅帯連続焼鈍炉（特公昭５２−２６７２３号
）、予熱帯域として対流予熱帯と放射型予熱帯とを設け
た直火式連続熱処理炉（特公昭５４−４２８０４号）、
加熱帯入側から均熱帯出側までの間に誘導加熱炉を配し
た銅帯連続加熱方式（特開昭６０−２６３４号）等が知
られている。その他に、炉長を長くしてそれだけ通板速
度を速めることも知られている。In such continuous heating equipment, cold-rolled stainless steel strips (hereinafter sometimes abbreviated as stainless steel strips) reflect heat rays due to their good surface gloss, so the absorption efficiency of radiant heat is low, and the temperature rise is low. In the past, the heat treatment capacity of heating equipment was low, and various techniques have been proposed to improve the heat treatment capacity of stainless steel strips6.
For example, as a technology to provide a preheating section (preheating zone) for preheating the copper strip, there is a copper strip continuous annealing furnace (Japanese Patent Publication No. 52-26723) equipped with a preheating zone that can heat the steel strip using only waste gas, and a preheating zone. Direct-fired continuous heat treatment furnace equipped with a convection preheating zone and a radiant preheating zone (Special Publication No. 1984-42804),
A copper strip continuous heating method (Japanese Patent Application Laid-Open No. 60-2634), in which an induction heating furnace is arranged between the input side of the heating zone and the output side of the soaking zone, is known. In addition, it is also known that the length of the furnace can be increased to increase the threading speed accordingly.
また、熱処理炉の炉内雰囲気温度を可及的に高くする方
法も考えられるが、ステンレス鋼帯の焼鈍では熱処理温
度が７５０℃〜１１００℃と可成り高いため、炉壁の耐
熱温度に素材からくる制約（通常１３００℃程度まで）
があってそれ程の成果は得られない。Another option is to raise the temperature of the atmosphere inside the heat treatment furnace as high as possible, but since the heat treatment temperature for annealing stainless steel strips is quite high, at 750°C to 1100°C, the (usually up to about 1300℃)
However, you won't get that much results.
これらの従来技術における廃ガスによる予熱や誘導加熱
はステンレス鋼帯の加熱全体に消費される熱量の一部を
通常燃料以外のものでまかなったことになるにすぎず、
炉長を長くする技術も含めて加熱ゾーンにおけるステン
レス鋼帯への輻射熱の吸収効率の向上には直接寄与して
いない欠点があった。Preheating using waste gas and induction heating in these conventional techniques only cover a portion of the amount of heat consumed in heating the stainless steel strip using something other than normal fuel.
There were drawbacks, including the technology of increasing the length of the furnace, which did not directly contribute to improving the absorption efficiency of radiant heat to the stainless steel strip in the heating zone.
輻射熱の吸収効率の向上に寄与する従来技術としては、
本発明者らの一部がなした先の発明、すなわち加熱炉に
導入される前の銅帯を酸素富化雰囲気に維持した誘導加
熱炉に通板して銅帯表面に黒色の酸化スケール層を強制
的に形成させる方法（特開昭６１−２５７４３０号）が
ある。この方法は輻射熱の吸収効率を可成りの程度に向
上させるが必ずしも充分ではなく高価な電力を使用する
ので不経済でもあり、その上、装置としても簡単でない
欠点があった。Conventional technologies that contribute to improving the absorption efficiency of radiant heat include:
The previous invention made by some of the present inventors is that the copper strip is passed through an induction heating furnace maintained in an oxygen-enriched atmosphere before being introduced into the heating furnace, and a black oxide scale layer is formed on the surface of the copper strip. There is a method (Japanese Unexamined Patent Application Publication No. 257430/1983) in which the formation of . Although this method improves the absorption efficiency of radiant heat to a considerable extent, it is not always sufficient and is uneconomical because it uses expensive electric power.Furthermore, it has the disadvantage that the device is not simple.
また、表面光沢の良好なステンレス鋼帯の輻射熱吸収効
率を上げるためにステンレス鋼帯表面に黒色塗料を塗布
することも提案されたが、この方法はステンレス鋼帯表
面に塗料との化合物を生成させるために製品品質に悪い
影響を及ぼすという欠点があった。It has also been proposed to apply black paint to the surface of the stainless steel strip in order to increase the radiant heat absorption efficiency of the stainless steel strip, which has a good surface gloss, but this method creates a compound with the paint on the surface of the stainless steel strip. Therefore, there was a drawback that it had a negative effect on product quality.
本発明は、上記従来技術のような欠点のないステンレス
冷延鋼帯の熱処理方法の提供を目的とする。この目的を
達成するためには、如何番として簡単な方法でステンレ
ス鋼帯の表面を高い輻射熱吸収効率を有するように且つ
ステンレス鋼帯表面に悪い影響を残さないように構成す
るかについて解決困難な問題点があった。The object of the present invention is to provide a method for heat treating cold rolled stainless steel strips that does not have the drawbacks of the prior art described above. In order to achieve this objective, it is difficult to solve the problem of how to configure the surface of the stainless steel strip in the simplest way to have high radiant heat absorption efficiency and not to leave any negative effects on the surface of the stainless steel strip. There was a problem.
本発明者らは上記問題点を解決すべく鋭意研究の結果、
主として輻射熱により加熱する熱処理炉の輻射熱加熱ゾ
ーンより上流側で完全黒体に近い物質としてカーボンを
ステンレス鋼帯に付着させて被覆すれば、その輻射熱の
吸収効率が著しく向上すると共にステンレス鋼帯表面に
悪い影響を残さないことを究明して本発明を完成した。As a result of intensive research by the present inventors to solve the above problems,
If a stainless steel strip is coated with carbon, which is a substance close to a completely black body, on the upstream side of the radiant heating zone of a heat treatment furnace that is heated mainly by radiant heat, the absorption efficiency of the radiant heat will be significantly improved, and the surface of the stainless steel strip will be coated with carbon. The present invention was completed by determining that it does not leave any negative effects.
すなわち本発明は、主として輻射熱により加熱する熱処
理炉にステンレス冷延鋼帯を通板して所定温度に加熱す
るに際し、該熱処理炉の輻射熱加熱ゾーンより上流側で
該ステンレス冷延鋼帯をカーボンで被覆してから加熱ゾ
ーンで加熱することを特徴するステンレス冷延鋼帯の熱
処理方法に関するものである。That is, in the present invention, when passing a cold-rolled stainless steel strip through a heat treatment furnace that is heated mainly by radiant heat and heating it to a predetermined temperature, the cold-rolled stainless steel strip is coated with carbon on the upstream side of the radiant heat heating zone of the heat treatment furnace. The present invention relates to a heat treatment method for cold rolled stainless steel strip, which is characterized in that it is coated and then heated in a heating zone.
以下に本発明方法を図面により詳細に説明する。The method of the present invention will be explained in detail below with reference to the drawings.
第１図は本発明方法の実施に好適な連続熱処理装置の１
例の配置系統図、第２図はオーステナイト系ステンレス
冷延鋼帯そのままとカーボン被覆したものとを大気中で
各種温度に加熱した後の熱吸収率と鋼帯温度の関係を示
す比較図、第３図はカーボン被覆したオーステナイト系
ステンレス冷延鋼帯を各種温度に加熱した後の加熱温度
とカーボン被覆率との関係図である。Figure 1 shows one of the continuous heat treatment apparatus suitable for carrying out the method of the present invention.
An example layout system diagram, Figure 2, is a comparison diagram showing the relationship between heat absorption rate and steel strip temperature after heating an austenitic stainless steel cold-rolled steel strip as it is and a carbon-coated one in the atmosphere to various temperatures. FIG. 3 is a diagram showing the relationship between heating temperature and carbon coverage after heating a carbon-coated austenitic stainless cold-rolled steel strip to various temperatures.
本発明の最も特徴とするところは、主として輻射熱によ
り加熱する熱処理炉の輻射熱加熱ゾーンよりも上流側で
ステンレス鋼帯をカーボンで被覆することにより、鋼帯
表面に均一な黒色被覆（カーボン被覆層）を強制的に形
成させ、引き続く加熱ゾーンでの輻射熱の吸収効率を良
くして昇温速度を速くした点にある。The most distinctive feature of the present invention is that the stainless steel strip is coated with carbon on the upstream side of the radiant heat heating zone of the heat treatment furnace, which is heated mainly by radiant heat, thereby creating a uniform black coating (carbon coating layer) on the surface of the steel strip. The point is that the rate of temperature rise is increased by forcibly forming radiant heat in the subsequent heating zone to improve absorption efficiency of radiant heat.
第１図により説明すると、ステンレス鋼帯１は上流から
矢印方向に走行して来て内部に主として輻射熱により加
熱する輻射熱加熱ゾーンを有する熱処理炉２に通板され
る。このときカーボンで被覆される位置は加熱ゾーンよ
りも上流側であり。To explain with reference to FIG. 1, a stainless steel strip 1 runs from upstream in the direction of the arrow and is passed through a heat treatment furnace 2 which has a radiant heating zone therein which is heated mainly by radiant heat. At this time, the position covered with carbon is on the upstream side of the heating zone.
例えば第１図に示すカーボン被覆装置３の設置位置の如
く熱処理炉２の上流側に隣接する位置でも良いし、熱処
理炉２の入口２ａに続く炉内の輻射熱加熱ゾーンより上
流側の位置であっても良い、カーボンでステンレス鋼帯
１を被覆するには、走行しているステンレス鋼帯１の近
くに設置したバーナにより、炭化水素ガス、殊にカーボ
ン含有率が高く且つ燃焼性の良好な炭化水素ガスを空気
比（炭化水素ガス１に対する空気量） ０．０１〜１で
不完全燃焼させることにより生成するカーボン（スス）
で被覆するのが良い。また、カーボン被覆装置３の出側
でカーボンのステンレス鋼帯被覆率（ステンレス鋼帯の
単位面積に対するカーボンにより被覆された面積の比率
）又は黒色度を例えば光沢針などで検出し、これをバー
ナ燃焼条件やステンレス鋼帯走行速度にフィードバック
して制御することもできる。For example, the installation position of the carbon coating device 3 shown in FIG. 1 may be a position adjacent to the upstream side of the heat treatment furnace 2, or a position upstream of the radiant heat heating zone in the furnace following the inlet 2a of the heat treatment furnace 2. In order to coat the stainless steel strip 1 with carbon, which may be carried out, a burner installed near the running stainless steel strip 1 is used to coat the stainless steel strip 1 with hydrocarbon gas, especially carbonized gas with a high carbon content and good combustibility. Carbon (soot) produced by incomplete combustion of hydrogen gas at an air ratio (amount of air to 1 hydrocarbon gas) of 0.01 to 1.
It is better to cover it with In addition, the stainless steel strip coverage ratio of carbon (the ratio of the area covered by carbon to the unit area of the stainless steel strip) or the degree of blackness of carbon is detected at the outlet side of the carbon coating device 3 using a glossy needle, etc., and this is detected by the burner combustion. It can also be controlled by feeding back the conditions and the running speed of the stainless steel strip.
上記の如くカーボンで被覆されたステンレス鋼帯１はそ
の下流側の主として輻射熱により加熱する熱処理炉２の
輻射熱加熱ゾーンを通過する間に輻射熱により鋼帯温度
で普通７５０℃から１１００℃までの温度範囲内の所定
温度に加熱されて焼鈍が行われるのである。As mentioned above, while the stainless steel strip 1 coated with carbon passes through the radiant heat heating zone of the heat treatment furnace 2 on the downstream side, which is heated mainly by radiant heat, the steel strip temperature normally ranges from 750°C to 1100°C due to radiant heat. The annealing process is performed by heating the steel to a predetermined temperature.
一般に、主として輻射熱により加熱が行われる熱処理炉
においては、被熱処理物が吸収する輻射熱量は、その表
面放射率Ｅ （熱吸収率とも呼ばれる）及び炉内温度（
Ｔ工）と銅帯温度（Ｔ２）との差（ＴニーＴ２）に大き
く影響されることは、ステファンボルツマンの法則から
知られている。ところでステンレス鋼や普通鋼の冷延鋼
帯のεは通常０．２〜０．４程度であって比較的小さく
、またステンレス鋼に必要な高温熱処理と炉構築素材上
の制限とから（’ｒｚ−’ｒｉ）も大きくとれない。こ
こで本発明方法によれば、ステンレスｔ＋ｑ帯１が未だ
昇温していない状態においてはカーボン被覆装置３によ
りカーボンの微粒子をステンレス鋼帯１に付着させて表
面を被覆することが可能であって、しかもこのカーボン
の熱吸収率εが完全黒体のそれ（Ｅ＝１）に近い０．９
５であることから、上記カーボン被覆された状態でのス
テンレス！帯１の熱吸収率従って輻射熱の吸収効率を従
来低かった低温のうちから格段に高めて、所定温度まで
の昇温時間を大幅に短縮するのである。その結果として
熱処理能力を大幅に向上させることができると共に熱処
理に必要な炉長を大幅に短くさせることがで曇るのであ
る。Generally, in a heat treatment furnace where heating is performed mainly by radiant heat, the amount of radiant heat absorbed by the object to be heat treated is determined by its surface emissivity E (also called heat absorption rate) and the furnace temperature (
It is known from Stefan Boltzmann's law that the temperature is greatly influenced by the difference between the copper zone temperature (T2) and the copper zone temperature (T2). By the way, the ε of cold-rolled steel strips made of stainless steel or ordinary steel is usually about 0.2 to 0.4, which is relatively small. -'ri) cannot be made large. Here, according to the method of the present invention, when the temperature of the stainless steel t+q band 1 has not yet risen, it is possible to apply carbon fine particles to the stainless steel band 1 using the carbon coating device 3 to coat the surface thereof. , and the heat absorption coefficient ε of this carbon is 0.9, which is close to that of a perfect black body (E = 1).
5, so it is stainless steel in the above carbon coated state! The heat absorption rate and therefore the radiant heat absorption efficiency of the band 1 is significantly increased from a conventionally low low temperature, and the time required to raise the temperature to a predetermined temperature is significantly shortened. As a result, the heat treatment capacity can be greatly improved, and the furnace length required for heat treatment can be significantly shortened.
このようなことは第２図により裏付けされる。This fact is supported by Figure 2.
第２図はオーステナイト系ステンレス鋼冷延鋼帯をその
まま（カーボン被覆なし）か又はカーボン被覆をしてか
ら大気雰囲気中で各種温度に加熱した後、その熱吸収率
ξを測定してそれと銅帯温度との関係を示したものであ
る。カーボン被覆なしの場合（従来の熱処理方法におけ
るステンレス鋼帯の状態）は銅帯温度の低温側において
熱吸収率εが低い値となっているのに対し、カーボン被
覆のある場合は鋼帯温度の高低にかかわらず熱吸収率ε
は高い値を示している。この結果、カーボン被覆された
ステンレス鋼帯は、加熱ゾーンに導入されると同時にカ
ーボン被覆なしの場合の（１，４から最高）約２倍以上
の熱量を受熱する。従って、ステンレス鋼帯を所定温度
にまで加熱するのに最高約半分の時間で済むから、従来
の炉長を保てば通板速度を最高約２倍に高めて熱処理能
力を増大せしめることが出来、また炉長を従来の最高約
半分に短縮して設備費の削減を図ることが出来るのであ
る。Figure 2 shows the heat absorption rate ξ of cold-rolled austenitic stainless steel strips that are heated as they are (without carbon coating) or coated with carbon and then heated to various temperatures in the atmosphere. This shows the relationship with temperature. In the case without carbon coating (the state of stainless steel strip in the conventional heat treatment method), the heat absorption rate ε is low at the low temperature side of the copper strip, whereas in the case of carbon coating, the heat absorption rate ε is low at the low temperature side of the steel strip. Heat absorption rate ε regardless of high or low
shows a high value. As a result, the carbon-coated stainless steel strip receives approximately twice the amount of heat (from 1.4 to maximum) as it is introduced into the heating zone, as it would without the carbon coating. Therefore, it takes at most about half the time to heat the stainless steel strip to the specified temperature, so if the conventional furnace length is maintained, the strip passing speed can be increased up to about twice and the heat treatment capacity can be increased. Furthermore, the length of the furnace can be shortened to about half of the conventional length, thereby reducing equipment costs.
一方、ステンレス鋼帯に付着されたカーボンは個体の状
態を呈している。そして、加熱ゾーンを通過中にステン
レス鋼帯と共に被覆していたカーボンも昇温するに従っ
て炉内で気化（ＣＯ□となる）してステンレス鋼帯の表
面から消散する。従って、加熱ゾーン通過後の銅帯表面
にはカーボンは既に付着しておらず、ステンレス鋼帯表
面への浸炭等の影響は全くない。また、前記カーボン被
覆はステンレス鋼帯が未だ加熱されていない低温側でバ
ーナ燃焼により積極的にカーボンを付着させて行うため
、ステンレス鋼帯表面に残存している油類や摩耗粉など
の付着物もカーボン付着層中に取り込むことができ、カ
ーボンの消散と共に付着物を容易に剥離し易くなってい
て後の工程で脱スケール処理した際に表面品質の良好な
製品を得ることができ１品質向上の点からも有益である
。カーボンのステンレス鋼帯被覆率は、第３図に示す如
く鋼帯温度が７００℃〜８００℃になると著しく低下す
る（第３図は被覆率１００％にカーボン被覆したステン
レス鋼帯を各種温度に加熱した後の加熱温度とカーボン
被覆率との関係を示すものである）。熱処理炉内におい
てステンレス鋼帯の温度が未だ低くてそれ自体の熱吸収
率εが低い領域ではカーボンのステンレス鋼帯被覆率は
高くて熱吸収率εを高め、ステンレス鋼帯の温度が高く
なって所定温度（７５０〜ｌ 、 １００℃）になると
、カーボンの気化現象によりカーボンのステンレス鋼帯
被覆率が激減する。しかしこのような高温ではステンレ
ス鋼帯表面の酸化が進行しているため、第２図に示す如
く熱吸収率εは大きく低下しないのである６〔実施例及
び比較例〕
第１図の如く横型の熱処理炉２及びカーボン被覆装置３
が配置された連続熱処理装置を使用してオーステナイト
系ステンレス冷延鋼帯（ＳＵＳ３０４） １を熱処理し
た。カーボン被覆装置３は、バーナからの輝炎によるカ
ーボンのステンレス鋼帯表面への付着が均一となるよう
に配置した。熱処理炉２の炉内温度は８００℃〜１，１
００℃に保った。On the other hand, the carbon attached to the stainless steel strip is in a solid state. Then, as the temperature rises, the carbon that was coated with the stainless steel strip while passing through the heating zone vaporizes (becomes CO□) in the furnace and dissipates from the surface of the stainless steel strip. Therefore, no carbon is already attached to the surface of the copper strip after passing through the heating zone, and there is no effect of carburization or the like on the surface of the stainless steel strip. In addition, since the carbon coating is performed by actively depositing carbon by burner combustion at a low temperature side where the stainless steel strip has not yet been heated, deposits such as oil and abrasion powder remaining on the surface of the stainless steel strip may be removed. can also be incorporated into the carbon adhesion layer, and as the carbon dissipates, the adhesion can be easily peeled off, making it possible to obtain a product with good surface quality when descaling in the subsequent process, improving quality. It is also beneficial from this point of view. The carbon coverage of the stainless steel strip decreases significantly when the steel strip temperature reaches 700°C to 800°C, as shown in Figure 3. (This figure shows the relationship between the heating temperature and carbon coverage after heating.) In the heat treatment furnace, in the region where the temperature of the stainless steel strip is still low and its own heat absorption rate ε is low, the coverage of the stainless steel strip with carbon is high, increasing the heat absorption rate ε, and the temperature of the stainless steel strip becomes high. When the temperature reaches a predetermined temperature (750 to 100° C.), the carbon coverage of the stainless steel strip is drastically reduced due to the vaporization phenomenon of carbon. However, at such high temperatures, the oxidation of the stainless steel strip surface progresses, so the heat absorption rate ε does not decrease significantly as shown in Figure 2.6 [Example and Comparative Example] As shown in Figure 1, the horizontal type Heat treatment furnace 2 and carbon coating device 3
An austenitic stainless steel cold-rolled steel strip (SUS304) 1 was heat-treated using a continuous heat treatment apparatus equipped with the following. The carbon coating device 3 was arranged so that carbon was evenly attached to the surface of the stainless steel strip by the bright flame from the burner. The temperature inside the heat treatment furnace 2 is 800℃~1.1
The temperature was maintained at 00°C.
実施例
カーボン被覆装置３には炭化水素ガスとしてプロパンガ
スを使用し、空気比を０．１として不完全燃焼させなが
らステンレス鋼帯１を熱処理炉２に通板して炉出口で銅
帯温度が所定の８００℃に昇温しでいるように加熱され
る最高通板速度を求めたところ１５ｍ／分であった。Example Propane gas was used as the hydrocarbon gas in the carbon coating device 3, and the stainless steel strip 1 was passed through the heat treatment furnace 2 while incompletely combusted at an air ratio of 0.1, so that the temperature of the copper strip at the furnace outlet was increased. The maximum sheet passing speed at which the sheet was heated to a predetermined temperature of 800° C. was determined to be 15 m/min.
比較例
カーボン被覆装置３を作動させなかったこと以外は実施
例と同様に行ったところ、炉出口で鋼帯温度が上記同じ
８００℃に昇温されているように加熱される最高通板速
度は９ｍ／分であった。Comparative Example The same procedure as in the example was carried out except that the carbon coating device 3 was not activated. The speed was 9m/min.
本発明方法によれば、ステンレス鋼帯の主として輻射熱
による加熱処理に当って輻射熱加熱ゾーンの上流側でカ
ーボンによりその表面を被覆することにより、加熱ゾー
ンに入ったばかりの未だ低温のときからステンレス鋼帯
の熱吸収率を高め従って輻射熱の吸収効率を高めて高温
の所定温度までの昇温時間を短縮することが出来、そし
て高温ではカーボンは気化してしまってステンレス鋼帯
の表面に何ら影響も残すことがない、その結果、加熱処
理能力を大幅に向上させることができると共にランニン
グコストの低減を図ることができ、合わせて炉長を短く
してスペースの縮小化や設備費用の低減を図ることがで
きる。しかも前記カーボン被覆は、既存の装置を利用し
て極めて簡単に実施することができる。このような本発
明方法は。According to the method of the present invention, when the stainless steel strip is heated mainly by radiant heat, the surface of the stainless steel strip is coated with carbon on the upstream side of the radiant heat heating zone. This increases the heat absorption rate of the stainless steel strip, thus increasing the absorption efficiency of radiant heat and shortening the heating time to a specified high temperature.At high temperatures, carbon vaporizes and leaves no effect on the surface of the stainless steel strip. As a result, it is possible to significantly improve heat treatment capacity and reduce running costs.In addition, the length of the furnace can be shortened to reduce space and equipment costs. can. Moreover, the carbon coating can be carried out extremely easily using existing equipment. This method of the present invention is as follows.
従来のステンレス鋼帯連続加熱方法にはない効果を発揮
することができる画期的な方法であり、その工業的価値
は非常に大きなものがある。This is an epoch-making method that can exhibit effects not found in conventional continuous heating methods for stainless steel strips, and its industrial value is extremely large.
第１図は本発明方法の実施に適当な連続熱処理装置の１
例の配置系統図、第２図はオーステナイト系ステンレス
冷延鋼帯そのままとカーボン被覆したものとを大気中で
各種温度に加熱した後の熱吸収率と鋼帯温度の関係を示
す比較図、第３図はカーボン被覆したオーステナイト系
ステンレス冷延鋼帯を各種温度に加熱した後の加熱温度
とカーボン被覆率との関係図である。
１・・・・鋼帯
２・・・・熱処理炉
２ａ・・・・入口
３・・・・カーボン被覆装置Figure 1 shows one of the continuous heat treatment apparatus suitable for carrying out the method of the present invention.
An example layout system diagram, Figure 2, is a comparison diagram showing the relationship between heat absorption rate and steel strip temperature after heating an austenitic stainless steel cold-rolled steel strip as it is and a carbon-coated one in the atmosphere to various temperatures. FIG. 3 is a diagram showing the relationship between heating temperature and carbon coverage after heating a carbon-coated austenitic stainless cold-rolled steel strip to various temperatures. 1...Steel strip 2...Heat treatment furnace 2a...Inlet 3...Carbon coating device
Claims (1)
ス冷延鋼帯を通板して所定温度に加熱するに際し、該熱
処理炉の輻射熱加熱ゾーンより上流側で該ステンレス冷
延鋼帯をカーボンで被覆してから加熱ゾーンで加熱する
ことを特徴するステンレス冷延鋼帯の熱処理方法。 ２ ステンレス冷延鋼帯のカーボンによる被覆を、炭化
水素ガスを不完全燃焼させたバーナの輝炎により行う特
許請求の範囲第１項に記載のステンレス冷延鋼帯の熱処
理方法。[Scope of Claims] 1. When passing a cold-rolled stainless steel strip through a heat treatment furnace that is heated mainly by radiant heat and heating it to a predetermined temperature, the cold-rolled stainless steel strip is passed upstream from the radiant heat heating zone of the heat treatment furnace. A heat treatment method for cold-rolled stainless steel strip, which is characterized by coating it with carbon and then heating it in a heating zone. 2. The heat treatment method for a cold-rolled stainless steel strip according to claim 1, wherein the cold-rolled stainless steel strip is coated with carbon using the bright flame of a burner that incompletely burns hydrocarbon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62273453A JPH0629457B2 (en) | 1987-10-30 | 1987-10-30 | Heat treatment method for cold rolled stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62273453A JPH0629457B2 (en) | 1987-10-30 | 1987-10-30 | Heat treatment method for cold rolled stainless steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01119628A true JPH01119628A (en) | 1989-05-11 |
| JPH0629457B2 JPH0629457B2 (en) | 1994-04-20 |
Family
ID=17528125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62273453A Expired - Lifetime JPH0629457B2 (en) | 1987-10-30 | 1987-10-30 | Heat treatment method for cold rolled stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0629457B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5306354A (en) * | 1991-07-10 | 1994-04-26 | Nisshin Steel Co., Ltd. | Method of blackening treating a stainless steel strip surface |
| CN111906142A (en) * | 2020-06-24 | 2020-11-10 | 浙江博星工贸有限公司 | Process for controlling mechanical property of cold-rolled stainless steel strip |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128529A (en) * | 1979-03-28 | 1980-10-04 | Nippon Steel Corp | Method and apparatus for continuously annealing steel plate |
| JPS568092A (en) * | 1979-06-29 | 1981-01-27 | Pfaff Ind Masch | Sewing machine with guide apparatus for sewn article |
-
1987
- 1987-10-30 JP JP62273453A patent/JPH0629457B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128529A (en) * | 1979-03-28 | 1980-10-04 | Nippon Steel Corp | Method and apparatus for continuously annealing steel plate |
| JPS568092A (en) * | 1979-06-29 | 1981-01-27 | Pfaff Ind Masch | Sewing machine with guide apparatus for sewn article |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5306354A (en) * | 1991-07-10 | 1994-04-26 | Nisshin Steel Co., Ltd. | Method of blackening treating a stainless steel strip surface |
| US5360202A (en) * | 1991-07-10 | 1994-11-01 | Chugai Ro Co., Ltd. | Blackening Treating furnace for treating stainless steel strip surface |
| CN111906142A (en) * | 2020-06-24 | 2020-11-10 | 浙江博星工贸有限公司 | Process for controlling mechanical property of cold-rolled stainless steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0629457B2 (en) | 1994-04-20 |
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