JPH02414B2 - - Google Patents
Info
- Publication number
- JPH02414B2 JPH02414B2 JP9243485A JP9243485A JPH02414B2 JP H02414 B2 JPH02414 B2 JP H02414B2 JP 9243485 A JP9243485 A JP 9243485A JP 9243485 A JP9243485 A JP 9243485A JP H02414 B2 JPH02414 B2 JP H02414B2
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- ferritic stainless
- bright
- cold
- steel
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000000137 annealing Methods 0.000 claims description 17
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 239000010960 cold rolled steel Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- -1 (CaS Chemical class 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Description
〔産業上の利用分野〕
本発明はフエライト系ステンレス冷延鋼帯の光
輝焼鈍方法に係り、特に光輝仕上面がすぐれた耐
錆性を有する光輝焼鈍方法に関し、フエライト系
ステンレス鋼のBA（光輝焼鈍）仕上の分野で利
用される。
〔従来の技術〕
JIS記号SUS430で代表されるフエライト系ス
テンレス鋼は比較的高い耐錆性を有するため鋼帯
あるいは鋼板の（以下両者を含めて鋼帯等と称す
る）表面の光沢性を維持しやすい。従つて、フエ
ライト系ステンレス鋼はこの性質を利用して、高
度に仕上げたロールを用いた冷間圧延、還元雰囲
気中での光輝焼鈍および高度に仕上げた大径ロー
ルによる調質圧延を施されたいわゆるBA
（Bright Annealing）仕上鋼帯等は、ストーブ反
射板、トースター側板などの電気器具の部品、自
動車外装部品あるいは展示ケース構体など、美麗
さを重要視する多くの用途がある。
しかしながら、フエライト系ステンレス冷延鋼
帯は鋼中の非金属介在物を起点として点錆を生じ
ることがあり、本発明者らの１人は点錆と非金属
介在物との関係について、水溶性を有する非金属
介在物、例えば（CaS、（Ca、Mn）Ｓおよび
（CaO）X（Al2O3）Yが特に有害であるという実験結
果を「鉄と鋼」第57巻（1971年）P.2152に報告し
ている。
他方、光輝焼鈍の条件によつては、BA仕上鋼
板が例えば食塩水の噴霧をうけると水溶性を有さ
ない非金属介在物の周縁を起点として発錆するこ
とも発錆事故品の原因究明過程で発見されてい
る。この水溶性を有さない非金属介在物の周縁を
起点として発錆する光輝焼鈍鋼板は、その表面を
＃400バフ仕上の如き軽度の研摩を施すことによ
り非金属介在物周縁を起点とする発錆を防止でき
ることが明らかとなつている。
これらの事実から、光輝焼鈍鋼板においては、
非金属介在物が点錆発生の原因となつていること
がわかる。
近時、鋼の溶解・精錬過程における脱硫反応お
よび脱酸反応の研究が進み、また分析機器の開
発・進歩とあいまつて、鋼中に生成する非金属介
在物の種類を高度に制御しうるようになると同時
に、その量の低減もできるようになつている。こ
のため、鋼中に水溶性を有する非金属介在物の混
入を抑制することはほぼ可能となつてきた。しか
しながら、非金属介在物は脱酸生成物の浮上・分
離不足、スラグの懸濁混入、２次酸化物の生成な
どにより鋼中に不可避的に介在するものであり、
これらを鋼中から完全に除去することは実用鋼の
溶製においては不可能といえる。
従つて製鋼技術のみによつてフエライト系ステ
ンレス鋼の光輝焼鈍鋼帯等の点錆を防止すること
は困難であり、光輝焼鈍においても点錆の防止策
が検討されている。
さて、一般にステンレス鋼の光輝焼鈍には非酸
化性ガスが使用されている。通常、非酸化性ガス
として用いられているのはアンモニアを触媒によ
つて分解したN2：H2＝１：３の混合ガスである
が、この他に特開昭54−126624で開示されている
H2単味ガスとN2単味ガスとを混合して使用する
技術、あるいは特開昭58−123831に開示されてい
る鈍水素ガスを用いる技術もある。前者は冷延鋼
帯の光輝性と表層への窒素濃化による耐食性の向
上とをより低コストで達成することを目的とした
ものであり、後者は表面光沢の向上を図つたもの
である。
また、光輝焼鈍したフエライト系ステンレス鋼
帯の耐食性を向上するため、従来特開昭58−
61220、59−22784、57−82421、58−126929等多
くの技術が提案されている。これらは特定の組成
の鋼を限定した炉内露点、炉内温度もしくは鋼帯
到達温度で焼鈍するものであるが、点錆に対して
必ずしも十分な防止効果をあげていない。
〔発明が解決しようとする問題点〕
本発明の目的は、上記従来技術の問題点を解決
し、特に製鋼では解決できない水に不溶性の非金
属介在物の周縁を起点とする点錆を防止できるフ
エライト系ステンレス冷延鋼帯の光輝焼鈍方法を
提供するにある。
〔問題点を解決するための手段および作用〕
本発明の要旨とするところは次の如くである。
すなわち、Crを重量比にて12％以上20％未満含
有するフエライト系ステンレス冷延鋼帯をN2：
H2＝１：３のガス雰囲気中で光輝焼鈍するフエ
ライト系ステンレス冷延鋼帯の光輝焼鈍方法にお
いて、前記鋼帯を400〜800℃の温度範囲における
平均昇温速度が炉内雰囲気露点および平均昇温速
度をそれぞれ座標軸とする直交座標中（第１図）
において下記第１表で示す座標点をその順に結ん
だ曲線から前記炉内雰囲気露点に応じて求められ
る平均昇温速度より速く加熱する段階と、前記加
熱後鋼帯を800〜880℃の温度範囲に２〜20秒間保
持する段階、前記保持後鋼帯を800〜400℃の温度
範囲について400℃／分以上の速度で冷却する段
階と、を有して成り、光輝仕上面がすぐれた耐錆
性を有することを特徴とするフエライト系ステン
レス冷延鋼帯の光
[Industrial Application Field] The present invention relates to a bright annealing method for ferritic stainless steel cold-rolled steel strip, and in particular to a bright annealing method in which a bright finish surface has excellent rust resistance. ) Used in the finishing field. [Prior art] Ferritic stainless steel, represented by the JIS symbol SUS430, has relatively high rust resistance, so it is difficult to maintain the surface gloss of steel strips or steel plates (hereinafter both are referred to as steel strips, etc.). Cheap. Therefore, taking advantage of this property, ferritic stainless steel is subjected to cold rolling using highly finished rolls, bright annealing in a reducing atmosphere, and temper rolling using highly finished large diameter rolls. So-called BA
(Bright Annealing) Finished steel strips have many uses where beauty is important, such as stove reflectors, parts of electrical appliances such as toaster side panels, automobile exterior parts, and display case structures. However, spot rust may occur in ferritic stainless cold rolled steel strips originating from non-metallic inclusions in the steel, and one of the inventors has investigated the relationship between spot rust and non-metallic inclusions. Experimental results that nonmetallic inclusions with ions, such as (CaS, (Ca, Mn ) S and ( CaO ) It is reported on page 2152. On the other hand, depending on the bright annealing conditions, when a BA finished steel sheet is sprayed with salt water, for example, rust may develop starting from the periphery of non-metallic inclusions that are not water soluble. This was also discovered in the process of investigating the cause of rusting accident products. Bright annealed steel sheets that rust starting from the periphery of non-metallic inclusions that are not water soluble are treated with mild surface finish such as #400 buffing. It is clear that rusting starting from the periphery of nonmetallic inclusions can be prevented by polishing.From these facts, bright annealed steel sheets
It can be seen that non-metallic inclusions are the cause of spot rust. Recently, research on desulfurization and deoxidation reactions during the melting and refining process of steel has progressed, and with the development and progress of analytical instruments, it has become possible to highly control the types of nonmetallic inclusions that form in steel. At the same time, it has become possible to reduce the amount. Therefore, it has become almost possible to suppress the incorporation of water-soluble nonmetallic inclusions into steel. However, nonmetallic inclusions are unavoidable in steel due to insufficient flotation and separation of deoxidized products, suspension of slag, generation of secondary oxides, etc.
It can be said that it is impossible to completely remove these from steel in the production of practical steel. Therefore, it is difficult to prevent spot rust in bright annealed steel strips of ferritic stainless steel using only steelmaking technology, and measures to prevent spot rust in bright annealing are also being considered. Now, in general, a non-oxidizing gas is used for bright annealing of stainless steel. Usually, the non-oxidizing gas used is a mixed gas of N 2 :H 2 =1:3 obtained by decomposing ammonia with a catalyst. There is
There is also a technique that uses a mixture of H 2 gas and N 2 gas, or a technique that uses blunt hydrogen gas as disclosed in JP-A-58-123831. The former aims to improve the brightness of cold-rolled steel strip and the corrosion resistance by enriching the surface layer with nitrogen at a lower cost, while the latter aims to improve the surface gloss. In addition, in order to improve the corrosion resistance of bright annealed ferritic stainless steel strips, we have
Many techniques have been proposed, such as 61220, 59-22784, 57-82421, 58-126929. These methods anneale steel of a specific composition at a limited furnace dew point, furnace temperature, or steel strip temperature, but they do not necessarily have a sufficient effect on preventing spot rust. [Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems of the prior art, and in particular to prevent spot rust originating from the periphery of water-insoluble nonmetallic inclusions, which cannot be solved in steel manufacturing. The object of the present invention is to provide a bright annealing method for a cold-rolled ferritic stainless steel strip. [Means and effects for solving the problems] The gist of the present invention is as follows.
In other words, a ferritic stainless steel cold-rolled steel strip containing 12% or more and less than 20% Cr by weight is N2 :
In a bright annealing method for brightly annealing a ferritic stainless cold rolled steel strip in a gas atmosphere of H 2 = 1:3, the average heating rate of the steel strip in the temperature range of 400 to 800°C is equal to the dew point of the furnace atmosphere and the average In Cartesian coordinates with the temperature increase rate as the coordinate axis (Figure 1)
, heating the steel strip faster than the average temperature increase rate determined according to the dew point of the furnace atmosphere from a curve connecting the coordinate points shown in Table 1 below in that order, and heating the steel strip after heating in a temperature range of 800 to 880 ° C. and cooling the steel strip at a rate of 400°C/min or more over a temperature range of 800°C to 400°C after holding the steel strip for 2 to 20 seconds. The light of ferritic stainless steel cold-rolled steel strip, which is characterized by having
【表】
輝焼鈍方法である。
本発明者らは、水に不溶性の非金属介在物を起
点とする点錆の現象が光輝焼鈍過程における熱履
歴に大きく依存するとの知見を得て本発明を完成
することができた。
本発明においてフエライト系ステンレス鋼の成
分を12％以上20％未満に限定したのは、12％未満
では耐錆性が不十分で、かつフエライト相を維持
するのが困難であり、また20％以上ではCrの効
果が飽和しコストアツプになるからである。
また、ガス雰囲気としては通常のN2：H2＝
１：３のアンモニア分解ガスを使用した。
次に本発明の基礎となつた実験について説明す
る。第２表に化学成分を示すSUS410および
SUS430ステンレス鋼を連鋳にて鋳片とし第３表
に示す工程に従つて0.3mm冷延板とし、引続いて
塩水噴霧試験を行つた。[Table] Bright annealing method. The present inventors were able to complete the present invention based on the knowledge that the phenomenon of spot rust originating from water-insoluble nonmetallic inclusions largely depends on the thermal history during the bright annealing process. In the present invention, the content of ferritic stainless steel is limited to 12% or more and less than 20% because if it is less than 12%, the rust resistance will be insufficient and it will be difficult to maintain the ferrite phase, and if it is more than 20% This is because the effect of Cr would be saturated and the cost would increase. Also, the gas atmosphere is normal N 2 :H 2 =
A 1:3 ratio of ammonia decomposition gas was used. Next, the experiments that formed the basis of the present invention will be explained. Table 2 shows the chemical components of SUS410 and
SUS430 stainless steel was continuously cast into slabs, which were made into 0.3 mm cold-rolled plates according to the process shown in Table 3, and subsequently subjected to a salt spray test.
【表】【table】
【表】
すなわち、0.3mmの冷延板を100mm×150mmに小
切りし、トリクロロエタンで脱脂したのちN2：
H2＝１：３のガス雰囲気で実験室的に光輝焼鈍
を行つた。試験片の到達温度は800〜860℃で、
800〜860℃の温度における保熱時間は２〜15秒で
ある。焼鈍に際し、加湿により炉内雰囲気露点を
−43℃から一64℃に変化させ、更に炉温を上下に
変えて試片の昇温速度を変化させた。
光輝焼鈍後の試片はそのままの表面仕上で
JISZ2371に準じて試験液および噴霧量の調整を
行つて塩水噴霧試験を行つた。すなわち、試験温
度は50℃、試験時間は16時間噴霧で、50℃の槽内
に８時間保持した。
それらの結果をまとめて第２図に示した。第２
図において光輝性、耐錆性の評価は下記第４表の
如くである。[Table] In other words, a 0.3 mm cold-rolled plate was cut into pieces of 100 mm x 150 mm, degreased with trichloroethane, and then exposed to N 2 :
Bright annealing was performed in the laboratory in a gas atmosphere of H 2 =1:3. The temperature reached by the test piece is 800-860℃,
The heat retention time at a temperature of 800-860°C is 2-15 seconds. During annealing, the dew point of the furnace atmosphere was changed from -43°C to -64°C by humidification, and the temperature rise rate of the specimen was changed by changing the furnace temperature up and down. The specimen after bright annealing has the same surface finish.
A salt spray test was conducted by adjusting the test liquid and spray amount in accordance with JISZ2371. That is, the test temperature was 50°C, the test time was 16 hours of spraying, and the test was held in a tank at 50°C for 8 hours. The results are summarized in Figure 2. Second
In the figure, the evaluation of brightness and rust resistance is as shown in Table 4 below.
【表】【table】
Claims (1)
フエライト系ステンレス冷延鋼帯をN2：H2＝
１：３のガス雰囲気中で光輝焼鈍するフエライト
系ステンレス冷延鋼帯の光輝焼鈍方法において、
前記鋼帯を400〜800℃の温度範囲における平均昇
温速度が炉内雰囲気露点および平均昇温速度をそ
れぞれ座標軸とする直交座標中において下記第１
表で示す座標点をその順に結んだ曲線から前記炉
内雰囲気露点に応じて求められる平均昇温速度よ
り速く加熱する段階と、前記加熱後鋼帯を800〜
880℃の温度範囲に２〜20秒間保持する段階と、
前記保持後鋼帯を800〜400℃の温度範囲について
400℃／分以上の速度で冷却する段階と、を有し
て成り、光輝仕上面がすぐれた耐錆性を有するこ
とを特徴とするフエライト系ステンレス冷延鋼帯
の光輝焼鈍方法。 【表】[Claims] 1. A ferritic stainless steel cold-rolled steel strip containing 12% or more and less than 20% Cr by weight, N 2 :H 2 =
In a bright annealing method for a ferritic stainless steel cold rolled steel strip that is bright annealed in a 1:3 gas atmosphere,
The average heating rate of the steel strip in the temperature range of 400 to 800°C is determined as follows in the orthogonal coordinates with the furnace atmosphere dew point and the average heating rate as the coordinate axes.
heating the steel strip faster than the average temperature increase rate determined according to the dew point of the furnace atmosphere from a curve connecting the coordinate points shown in the table in that order;
holding in a temperature range of 880°C for 2 to 20 seconds;
After holding the steel strip about the temperature range of 800~400℃
1. A bright annealing method for a cold-rolled ferritic stainless steel strip, comprising a step of cooling at a rate of 400° C./min or more, the bright finished surface having excellent rust resistance. 【table】
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9243485A JPS61253323A (en) | 1985-04-30 | 1985-04-30 | Bright annealing method for cold rolled ferritic stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9243485A JPS61253323A (en) | 1985-04-30 | 1985-04-30 | Bright annealing method for cold rolled ferritic stainless steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61253323A JPS61253323A (en) | 1986-11-11 |
| JPH02414B2 true JPH02414B2 (en) | 1990-01-08 |
Family
ID=14054327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9243485A Granted JPS61253323A (en) | 1985-04-30 | 1985-04-30 | Bright annealing method for cold rolled ferritic stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61253323A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2746902B2 (en) * | 1988-03-16 | 1998-05-06 | 川崎製鉄株式会社 | Method for producing bright annealed ferritic stainless steel strip with excellent rust resistance |
| KR100436881B1 (en) * | 1998-09-09 | 2004-09-08 | 주식회사 포스코 | Manufacturing method of austenitic stainless steel sheet with improved corrosion resistance |
| JP2007119856A (en) * | 2005-10-28 | 2007-05-17 | Nisshin Steel Co Ltd | Hydrophilic stainless steel sheet and its manufacturing method |
-
1985
- 1985-04-30 JP JP9243485A patent/JPS61253323A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61253323A (en) | 1986-11-11 |
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