JPH03271330A - Method for annealing cold rolled stainless steel strip - Google Patents
Method for annealing cold rolled stainless steel stripInfo
- Publication number
- JPH03271330A JPH03271330A JP6954590A JP6954590A JPH03271330A JP H03271330 A JPH03271330 A JP H03271330A JP 6954590 A JP6954590 A JP 6954590A JP 6954590 A JP6954590 A JP 6954590A JP H03271330 A JPH03271330 A JP H03271330A
- Authority
- JP
- Japan
- Prior art keywords
- annealing
- stainless steel
- descaling
- steel strip
- coke oven
- 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.)
- Pending
Links
- 238000000137 annealing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 31
- 239000010935 stainless steel Substances 0.000 title claims abstract description 27
- 239000000571 coke Substances 0.000 claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 238000005554 pickling Methods 0.000 abstract description 17
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 24
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- 239000003949 liquefied natural gas Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 229960002050 hydrofluoric acid Drugs 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003915 liquefied petroleum gas Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000012733 comparative method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
- 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の連続焼鈍方法に関し、
より詳しくは連続焼鈍酸洗ラインにおいて、焼鈍に引続
いて行われる酸洗等の脱スケールに要する時間及び設備
を短縮し、しかも良好な表面状態の得られる焼鈍方法に
関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous annealing method for cold rolled stainless steel strip.
More specifically, the present invention relates to an annealing method which shortens the time and equipment required for descaling such as pickling performed subsequent to annealing in a continuous annealing and pickling line, and which provides a good surface condition.
［従来の技術］
周知のようにステンレス鋼帯は、その仕上げ製造工程に
おいて冷間圧延及び焼鈍を行い所定の材質の製品とされ
る。このような製造過程における焼鈍方法としては、一
般に、コイル状から巻戻した銅帯を、液化石油ガス（Ｌ
ＰＧ）あるいは液化天然ガス（ＬＮＧ）を空気比を１．
０−１．５で燃焼させた燃焼生成ガスを焼鈍炉に連続的
に送り込んで連続焼鈍する方法が広く採用されている。[Prior Art] As is well known, stainless steel strips are cold-rolled and annealed in the final manufacturing process to produce products of a predetermined material. In general, the annealing method used in this manufacturing process is to heat a copper strip unwound from a coil into liquefied petroleum gas (L).
PG) or liquefied natural gas (LNG) at an air ratio of 1.
A method of continuous annealing by continuously feeding combustion generated gas combusted at a temperature of 0 to 1.5 into an annealing furnace is widely adopted.
このような焼鈍によって銅帯表面に生成される酸化スケ
ールは、ステンレス鋼本来の耐食性や美観を損なうから
美麗かつ完全に除去する必要があり、したがってステン
レス冷延鋼帯の焼鈍ラインには酸洗等の脱スケール設備
を組込んで一連の焼鈍酸洗ラインとするのが通常である
。The oxide scale generated on the surface of the copper strip by such annealing impairs the corrosion resistance and aesthetics inherent to stainless steel, so it must be removed beautifully and completely. It is common to incorporate descaling equipment into a series of annealing and pickling lines.
ステンレス鋼帯は耐食性以外に表面性状が優れているこ
とから装飾や意匠性の性格の強い部材にも多く用いられ
ており、このため、これらのステンレス銅帯はそれぞれ
の使用目的に応じて種々の表面状態に仕上げられる。Ｊ
ＩＳ Ｇ４３０５「冷間圧延ステンレス鋼帯」および
ＪＩＳ Ｇ４３０７「冷間圧延ステンレス鋼帯」に規
定されるＮｏ、２ＤもしくはＮｏ、 ２ Ｂ仕上げは、
冷間圧延後、熱処理、酸洗を施した後、つや消しロール
等により冷間圧延をして仕上げる工程を経て製造される
。Stainless steel strips are not only corrosion resistant but also have excellent surface properties, so they are often used for decorative and decorative parts. For this reason, these stainless steel strips are used in a variety of ways depending on the purpose of use. Finished to the surface condition. J
No, 2D or No, 2B finishes specified in IS G4305 "Cold rolled stainless steel strip" and JIS G4307 "Cold rolled stainless steel strip" are:
After cold rolling, it is heat treated, pickled, and then cold rolled using a matte roll or the like to finish it.
しかしながら酸洗後の表向性状が最終製品としての表面
状態に大きな影響を与えるため、酸化スケールの性状と
酸洗方法はステンレス鋼帯の製品価値を決定する大きな
要因となっている。However, since the surface properties after pickling have a large effect on the surface condition of the final product, the properties of oxide scale and the pickling method are major factors in determining the product value of stainless steel strips.
このため、従来のステンレス冷延鋼帯の連続焼鈍酸洗ラ
インにおいては、焼鈍後の脱スケール方０法として溶融
アルカリ塩処理もしくは中性塩電解処理等の前処理と酸
洗とを組合わせた方法が採用されている。しかしながら
上述のような脱スケール方法を適用した連続焼鈍酸洗ラ
インでは、長大な脱スケール設備で長時間の処理時間を
必要とする。For this reason, in conventional continuous annealing and pickling lines for cold-rolled stainless steel strips, pickling is combined with pretreatment such as molten alkali salt treatment or neutral salt electrolysis treatment as a zero-descaling method after annealing. method has been adopted. However, the continuous annealing and pickling line to which the above-described descaling method is applied requires a long descaling equipment and a long processing time.
上述のような問題を解決するためステンレス冷延鋼帯の
製造において、除去しやすい酸化スケールを焼鈍時に生
成させる方策と、焼鈍後の脱スケール処理能力を高める
方策との両面から種々提案がなされている。In order to solve the above-mentioned problems, various proposals have been made in the production of cold-rolled stainless steel strips, both from the viewpoint of creating oxidized scale that is easy to remove during annealing, and improving the descaling ability after annealing. There is.
例えば、特開昭５９−２３２２３３号公報では、コーク
ス炉ガスを空気比１．０〜１．５の範囲で燃焼させた雰
囲気内でステンレス冷延鋼帯を焼鈍する方法が提示され
ている。これは従来使用されていた液化石油ガス、液化
天然ガス等の燃焼ガスによる場合と比較して脱スケール
処理を従来より効率よく行なおうというものであり、容
易に除去可能な酸化スケールを生成して脱スケール処理
時間を短縮しようとするものである。For example, JP-A-59-232233 discloses a method of annealing a cold-rolled stainless steel strip in an atmosphere in which coke oven gas is burned at an air ratio of 1.0 to 1.5. This is an attempt to perform descaling more efficiently than conventional combustion gases such as liquefied petroleum gas and liquefied natural gas, and does not generate oxidized scale that can be easily removed. The aim is to shorten the descaling process time.
しかしこの方法においても、なお脱スケールに長時間を
要し、長大な酸洗設備を必要とする。However, even with this method, descaling still takes a long time and requires extensive pickling equipment.
本発明は、冷間圧延されたステンレス冷延鋼帯を連続焼
鈍・脱スケールするに際し、焼鈍時に更に除去しやすい
酸化スケールを生成させることにより、脱スケール時間
及び設備をさらに短縮しながら、しかも良好な表面状態
を得て、上記従来技術の問題を解決しようとするもので
ある。The present invention enables continuous annealing and descaling of cold-rolled stainless steel cold-rolled steel strips by generating oxidized scale that is easier to remove during annealing, thereby further shortening the descaling time and equipment, while also achieving excellent results. This is an attempt to solve the problems of the above-mentioned prior art by obtaining a surface state that is similar to the above.
本発明は、上記課題を解決するために、冷間圧延された
ステンレス冷延鋼帯を連続焼鈍した後、脱スケールする
際の焼鈍方法において、前記焼鈍における焼鈍雰囲気を
コークス炉ガス燃焼雰囲気とし、その空気比を板温６０
０℃までは１．０未満とし、６００℃を越える板温では
１．０以上とすることを特徴とするステンレス冷延鋼帯
の焼鈍方法を提供するものである。In order to solve the above problems, the present invention provides an annealing method for descaling a cold-rolled stainless cold-rolled steel strip after continuous annealing, in which the annealing atmosphere in the annealing is a coke oven gas combustion atmosphere, The air ratio is 60
Provided is a method for annealing a cold rolled stainless steel strip, characterized in that the annealing temperature is less than 1.0 up to 0°C, and 1.0 or more at a plate temperature exceeding 600°C.
〔作用］
本発明の方法においては、ステンレス冷延鋼帯を焼鈍す
るための加熱エネルギとしてコークス製造のために用い
られるコークス炉の発生ガス、すなわちコークス炉ガス
を用い、その燃焼によって生成されるガス雰囲気中でス
テンレス冷延鋼帯の焼鈍を行なう。[Function] In the method of the present invention, gas generated from a coke oven used for coke production, that is, coke oven gas, is used as heating energy for annealing cold rolled stainless steel strip, and the gas produced by the combustion of the coke oven gas is used. The cold rolled stainless steel strip is annealed in an atmosphere.
コークス炉ガスはコークス炉より発生する副生ガスであ
るため低コストであると共に、コークス炉ガスの燃焼生
成ガス雰囲気で焼鈍を行なうことにより、従来のＬＰＧ
やＬＮＧの燃焼による生成ガスを用いた場合の如き強固
な酸化スケールの代わりに、容易に除去可能な酸化スケ
ールが生成される。このことにより、その後の脱スケー
ル処理に要する時間が短縮され、また処理工程も簡素化
し得る。Coke oven gas is a by-product gas generated from coke ovens, so it is low cost, and by annealing in the atmosphere of combustion gas of coke oven gas, conventional LPG
Instead of the hard oxide scale that is produced when gas produced by combustion of LNG or LNG is used, easily removable oxide scale is produced. This reduces the time required for the subsequent descaling treatment and also simplifies the treatment process.
ここで、使用されるコークス炉ガスは鉄鋼−貫製鉄所の
コークス炉で通常製造されるものであればよく、適切な
コークス炉ガスの組成は次の通りである。The coke oven gas used here may be one normally produced in a coke oven of a steel mill, and a suitable composition of the coke oven gas is as follows.
ＣＯ２： １ ＝ ｌ Ｏｖ ｏ Ｉ２％Ｃ２Ｈ２：
０．０１〜０．５ ｖ ｏ ９％Ｃ２Ｈ，： ｌ−
５ＶＯＩ２％
Ｃ２Ｈに ： ０．１〜ｌ Ｖ ０１２％Ｈ２：４５
〜５５ｖｏＩ２％
０２ ：Ｏ，１〜０．５ｖｏＩ２％
ＣＨ４、＝ ２０〜３０ｖｏ９．％
ＣＯ：３〜ｌ Ｏ■ＯＩ２％
Ｎ２ ： ５〜１５ｖｏＩ２％
コークス炉ガス燃焼雰囲気におけるステンレス冷延鋼帯
の酸化反応は、当然のことながらコークス炉ガスの組成
、加熱温度、時間、及びコークス炉ガスと空気との混合
比率によって、炉内の酸素、水蒸気、二酸化炭素、−酸
化炭素、水素、炭化水素等の各分圧が変化して複雑な組
成を呈するが、本発明の方法の場合には、特にコークス
炉ガスの完全燃焼に必要な最小限空気量（理論空気量）
を１とした場合のコークス炉ガスに対する混７合空気の
比率（空気比）を板温６００℃までは１．０未満とし、
これを越える板温では１．０以上とする。CO2: 1 = l Ov o I2%C2H2:
0.01-0.5 v o 9%C2H,: l-
5VOI2% to C2H: 0.1~l V012%H2:45
~55voI2% 02 :O, 1~0.5voI2% CH4, = 20~30vo9. % CO: 3~l O■OI2% N2: 5~15voI2% The oxidation reaction of cold-rolled stainless steel strip in a coke oven gas combustion atmosphere naturally depends on the composition of the coke oven gas, heating temperature, time, and coke oven. Depending on the mixing ratio of gas and air, the partial pressures of oxygen, water vapor, carbon dioxide, -carbon oxide, hydrogen, hydrocarbons, etc. in the furnace change, resulting in a complex composition, but in the case of the method of the present invention, is the minimum amount of air (theoretical air amount) required for complete combustion of coke oven gas.
The ratio (air ratio) of mixed air to coke oven gas when is 1 is less than 1.0 up to a plate temperature of 600°C,
If the plate temperature exceeds this value, the value shall be 1.0 or more.
すなわち、板温６００℃までは、空気比が１．０未満の
いわゆる不完全燃焼雰囲気で焼鈍を行うことにより、酸
化スケールの成長が遅く、薄くポーラスなスケールとな
り、空気比１．０以上では過剰な酸素によってステンレ
ス冷延鋼帯に含まれるＦｅやＣｒ等の金属の酸性が進行
し、厚い酸化スケールが形成され、その後の脱スケール
処理への負荷を大きくする。In other words, when the plate temperature is up to 600°C, annealing is performed in a so-called incomplete combustion atmosphere with an air ratio of less than 1.0, so that the oxide scale grows slowly and becomes thin and porous. Oxygen causes acidity of metals such as Fe and Cr contained in the cold rolled stainless steel strip, forming a thick oxide scale, which increases the load on the subsequent descaling process.
一方、６００℃を越える温度では、空気比が１．０未満
では酸化スケールが急激に厚く成長して酸洗後に肌荒れ
が生じ、ステンレス鋼としての商品価値を著しく損なう
。ただし、空気比が２．０を越えるような場合は、焼鈍
炉の省エネルギーの観点から極度の不利を免れず、しか
も次工程における脱スケール性のより一層の向上及び表
面性状の向上も認められないため、空気比は２．０以下
とすることが望ましい。On the other hand, at a temperature exceeding 600° C., if the air ratio is less than 1.0, the oxide scale will rapidly grow thick and the surface will become rough after pickling, which will significantly impair the commercial value of the stainless steel. However, if the air ratio exceeds 2.0, it will be extremely disadvantageous from the perspective of energy conservation in the annealing furnace, and further improvements in descaling performance and surface texture in the next process will not be observed. Therefore, it is desirable that the air ratio be 2.0 or less.
第１図、第２図、第３図に、ステンレス冷延鋼帯をコー
クス炉ガス燃焼炉により焼鈍するにあたり、昇温開始か
らそれぞれ６００℃、８５０”Ｃ１ｉ ｏｏｏ℃の各温
度に加熱保持した後、冷却を開始するまでの空気比を種
々変化させて生成したスケール厚さを調べた結果を示す
。Figures 1, 2, and 3 show that when a cold-rolled stainless steel strip is annealed in a coke oven gas combustion furnace, it is heated and maintained at temperatures of 600°C and 850"C1i ooo°C, respectively, from the start of temperature rise. , shows the results of examining the scale thickness generated by varying the air ratio before starting cooling.
第４図、第５図に、酸洗後の表面性状、特に光沢度の点
において商品価値が厳しく規定されるフェライト系ステ
ンレス鋼を、コークス炉ガス燃焼炉により焼鈍するにあ
たり空気比を種々変化させて、６００℃と一般的なフェ
ライト系ステンレス鋼の焼鈍温度である８５０℃で焼鈍
機酸洗し、表面性状として光沢度を測定した結果を示す
、なおこれらの光沢度は酸洗のままの板である。光沢度
は入射角度２０度で白色光を試料表面に照射して正反射
光の強度を測定し、標準板（黒色ガラス）の場合の正反
射光強度を１００としたときの比で示した。Figures 4 and 5 show that ferritic stainless steel, whose commercial value is strictly defined in terms of surface quality after pickling, especially gloss, is annealed in a coke oven gas combustion furnace with various air ratios. The results show the results of annealing and pickling at 600℃ and 850℃, which is the annealing temperature of general ferritic stainless steel, and measuring the glossiness as a surface texture. It is. The glossiness was measured by irradiating the sample surface with white light at an incident angle of 20 degrees and measuring the intensity of specularly reflected light, and expressed as a ratio when the specularly reflected light intensity in the case of a standard plate (black glass) was taken as 100.
特に光沢度が商品価値に大きく影響を与えるフェライト
系ステンレス鋼については、光沢度が４００以下である
と商品価値を失うものである。In particular, with respect to ferritic stainless steel whose glossiness greatly affects its commercial value, if the glossiness is 400 or less, it loses its commercial value.
これらの図より、板温６００℃までは空気比１．０未満
、これを越した温度では１．０以上の雰囲気で焼鈍する
ことが、脱スケールに有利であり、酸洗後の表面性状に
も有効であることは明らかである。From these figures, annealing in an atmosphere with an air ratio of less than 1.0 at temperatures up to 600°C, and at temperatures above 1.0, is advantageous for descaling and improves the surface quality after pickling. It is clear that this is also effective.
なお、本発明では焼鈍時の加熱時間については特に限定
するものではなく、鋼種や銅帯厚み等に応じての適切に
定めればよい。In the present invention, the heating time during annealing is not particularly limited, and may be appropriately determined depending on the steel type, copper strip thickness, etc.
以下、実施例に基づいて本発明を説明する。 Hereinafter, the present invention will be explained based on Examples.
供試材料としては５ＵＳ４３０，５ＵＳ３０４の冷延板
で板厚１．２ｍｍのものを用いた。これらの供試材をコ
ークス炉ガスを種々の空気比で燃焼させた雰囲気中で実
験室的に焼鈍した。ここでコークス炉ガスとしては前記
組成範囲内のものを用いた。The test materials used were cold-rolled plates of 5US430 and 5US304 with a thickness of 1.2 mm. These specimens were annealed in the laboratory in an atmosphere in which coke oven gas was burned at various air ratios. Here, the coke oven gas used was one within the above composition range.
５ＬＩＳ４３０はその後、中性塩電解で脱スケールを行
った。ここで中性塩電解は液温８５℃、２００ｇ／βの
濃度の硫酸ナトリウム水溶液を用い、電流密度は８ Ａ
／ ｄ ｍ″で、陰極処理後、陽極処理を行った。5LIS430 was then descaled by neutral salt electrolysis. Here, neutral salt electrolysis uses a sodium sulfate aqueous solution with a concentration of 200 g/β at a liquid temperature of 85°C, and a current density of 8 A.
/ d m'', and anodization was performed after cathodic treatment.
５ＵＳ３０４は中性塩電解の後、硝弗酸浸漬による酸洗
処理を行った。ここで中性塩電解は５ＬＩＳ４３０で用
いたものと同様であり、硝弗酸は液温５５℃、１０ ｇ
７１２弗酸＋６０ｇ／β硝酸とした。After neutral salt electrolysis, 5US304 was subjected to pickling treatment by immersion in nitric-fluoric acid. Here, the neutral salt electrolysis is the same as that used in 5LIS430, and the nitric hydrofluoric acid is 10 g at a liquid temperature of 55°C.
712 hydrofluoric acid + 60 g/β nitric acid.
第１表は５ＬＩＳ４３０を供試材として用いた結果であ
る。焼鈍条件として板温６００℃以下では空気比１．０
未満とし、これを越した板温では空気比１．０以上で焼
鈍したものを本発明法として示した。脱スケール時間は
中性塩電解によって完全に脱スケールするまでの時間を
示した。光沢度は前述の方法に従って、酸洗のままのサ
ンプルを測定した。Table 1 shows the results using 5LIS430 as the test material. The annealing condition is that the air ratio is 1.0 when the plate temperature is 600℃ or less.
When the plate temperature exceeds this temperature, annealing is performed at an air ratio of 1.0 or more, which is shown as the method of the present invention. The descaling time indicates the time required for complete descaling by neutral salt electrolysis. Glossiness was measured on as-pickled samples according to the method described above.
第２表は５ＵＳ３０４を供試材として用いた結果である
。焼鈍条件は板温６００℃以下では空気比１．０未満と
し、これを越した板温では空気比１．０以上で焼鈍した
ものを本発明法として示した。Table 2 shows the results using 5US304 as the test material. The annealing conditions were such that when the plate temperature was 600° C. or lower, the air ratio was less than 1.0, and when the plate temperature exceeded this, annealing was performed at an air ratio of 1.0 or more, as the method of the present invention.
脱スケール時間は、一定時間の中性塩電解の後、硝弗酸
浸漬により完全に脱スケールするまでの合計時間で、光
沢度は第１表と同様に測定した。The descaling time is the total time required for complete descaling by nitric-fluoric acid immersion after a certain period of neutral salt electrolysis, and the glossiness was measured in the same manner as in Table 1.
第１表及び第２表から明らかなように、本発明法にした
がってコークス炉ガス燃焼雰囲気中においては焼鈍途中
で空気比を変えた場合は、従来例に従ってコークス炉ガ
スによる空気比１．０以上、もしくは、本発明法に従わ
ない方法によって焼鈍した場合の比較法に比較して、脱
スケールの処理時間を短縮することが可能となり、特に
フェライト系ステンレス鋼について酸洗後に良好な表面
性状を有するステンレス鋼を得ることができる。As is clear from Tables 1 and 2, when the air ratio is changed during annealing in a coke oven gas combustion atmosphere according to the method of the present invention, the air ratio with coke oven gas is 1.0 or more according to the conventional method. Or, compared to a comparative method in which annealing is performed by a method that does not follow the method of the present invention, it becomes possible to shorten the descaling treatment time, and in particular, ferritic stainless steel has good surface properties after pickling. You can get stainless steel.
［発明の効果］
本発明方法により焼鈍時にステンレス冷延鋼帯表面に生
成する酸化スケールが容易に除去可能なものとなり、し
たがって焼鈍に引続いて行われる酸洗等による脱スケー
ル処理効率を従来より向上させ、脱スケール処理時間を
短縮することが可能となる。[Effects of the Invention] The method of the present invention makes it possible to easily remove the oxide scale that forms on the surface of cold-rolled stainless steel strip during annealing, and therefore improves the efficiency of descaling by pickling, etc. performed subsequent to annealing, compared to conventional methods. This makes it possible to improve the descaling process and shorten the descaling process time.
また脱スケールしやすい酸化皮膜とすることにより、脱
スケール処理もマイルドな条件で脱スケールが可能とな
り、ステンレス鋼素地をほとんど溶解することなく脱ス
ケール可能となるので、脱スケール後も良好な表面性状
が得られ商品価値の向上を図ることができる等、各種の
効果が得られる。In addition, by forming an oxide film that is easy to descale, descaling can be performed under mild conditions, and the stainless steel substrate can be descaled without almost dissolving, so it maintains good surface quality even after descaling. Various effects can be obtained, such as the ability to improve product value.
第１図、第２図及び第３図はそれぞれ焼鈍温度及び空気
比とスケール厚さとの関係を示す図、第４図及び第５図
はそれぞれ焼鈍温度及び空気比と光沢度との関係を示す
図である。Figures 1, 2, and 3 are diagrams showing the relationship between annealing temperature, air ratio, and scale thickness, respectively, and Figures 4 and 5 are diagrams showing the relationship between annealing temperature, air ratio, and glossiness, respectively. It is a diagram.
Claims (1)
後、脱スケールする際の焼鈍方法において、前記焼鈍に
おける焼鈍雰囲気をコークス炉ガス燃焼雰囲気とし、そ
の空気比を板温６００℃までは１．０未満とし、６００
℃を越える板温では１．０以上とすることを特徴とする
ステンレス冷延鋼帯の焼鈍方法。1. In an annealing method for descaling a cold rolled stainless steel strip after continuous annealing, the annealing atmosphere in the annealing is a coke oven gas combustion atmosphere, and the air ratio is 1 until the plate temperature is 600 ° C. Less than .0, 600
A method for annealing a cold-rolled stainless steel strip, characterized in that the annealing temperature is 1.0 or more when the plate temperature exceeds ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6954590A JPH03271330A (en) | 1990-03-22 | 1990-03-22 | Method for annealing cold rolled stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6954590A JPH03271330A (en) | 1990-03-22 | 1990-03-22 | Method for annealing cold rolled stainless steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03271330A true JPH03271330A (en) | 1991-12-03 |
Family
ID=13405797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6954590A Pending JPH03271330A (en) | 1990-03-22 | 1990-03-22 | Method for annealing cold rolled stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03271330A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5663702A (en) * | 1995-06-07 | 1997-09-02 | Littelfuse, Inc. | PTC electrical device having fuse link in series and metallized ceramic electrodes |
| US5955936A (en) * | 1995-05-10 | 1999-09-21 | Littlefuse, Inc. | PTC circuit protection device and manufacturing process for same |
-
1990
- 1990-03-22 JP JP6954590A patent/JPH03271330A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5955936A (en) * | 1995-05-10 | 1999-09-21 | Littlefuse, Inc. | PTC circuit protection device and manufacturing process for same |
| US5663702A (en) * | 1995-06-07 | 1997-09-02 | Littelfuse, Inc. | PTC electrical device having fuse link in series and metallized ceramic electrodes |
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