JPH01312058A - Ferritic stainless steel excellent in rust resistance, surface characteristic, and weldability - Google Patents
Ferritic stainless steel excellent in rust resistance, surface characteristic, and weldabilityInfo
- Publication number
- JPH01312058A JPH01312058A JP14056588A JP14056588A JPH01312058A JP H01312058 A JPH01312058 A JP H01312058A JP 14056588 A JP14056588 A JP 14056588A JP 14056588 A JP14056588 A JP 14056588A JP H01312058 A JPH01312058 A JP H01312058A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- weldability
- ferritic stainless
- resistance
- rust resistance
- 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
- 229910001220 stainless steel Inorganic materials 0.000 title abstract description 20
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract 2
- 238000005260 corrosion Methods 0.000 description 23
- 230000007797 corrosion Effects 0.000 description 23
- 230000007423 decrease Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は耐銹性、表面性状および溶接性に優れたフェラ
イト系ステンレス鋼に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a ferritic stainless steel that has excellent rust resistance, surface texture, and weldability.
〈従来の技術〉
一般にステンレス冷延鋼板は、その熱延鋼帯の冷延後の
焼鈍条件により３つに大別される。すなわち焼鈍後酸洗
する２Ｂあるいは２Ｄ材、および無酸化雰囲気で焼鈍す
るＢＡ材である。<Prior Art> In general, cold-rolled stainless steel sheets are roughly classified into three types depending on the annealing conditions after cold rolling of the hot-rolled steel strip. Namely, these are 2B or 2D material, which is pickled after annealing, and BA material, which is annealed in a non-oxidizing atmosphere.
さて、５ＵＳ４３０で代表されるフェライト系ステンレ
ス鋼は、５ｔＪＳ３０４で代表されるオーステナイト系
ステンレス鋼に比べ耐食性には劣るものの安価であるこ
とおよび光沢に優れているため、各種の厨房器具、各種
装飾部材等の用途に広く使用されており、これらの部材
に加工するため種々のプレス加工および溶接が施される
。Although ferritic stainless steel represented by 5US430 is inferior in corrosion resistance to austenitic stainless steel represented by 5tJS304, it is inexpensive and has excellent gloss, so it is used in various kitchen appliances, various decorative materials, etc. It is widely used for various applications, and various press working and welding processes are performed to process these parts.
しかしながら、フェライト系ステンレス鋼では板の板幅
方向で塑性挙動が異なることによりプレス成形品に凹凸
（リジング）が生じ、表面の美麗さを著しく害する問題
があった。また部材の生産能率向上の点から溶接作業性
に優れたフェライト系ステンレス鋼が望まれていた。一
方、耐食性については前に述べたようにオーステナイト
系ステンレス鋼に比べ劣るため、これらの部材の使用中
に発銹する等の問題が生ずる場合があり耐誘性の改善が
望まれていた。即ち耐銹性、プレス成形後の表面性状お
よび溶接性に優れたフェライト系ステンレス鋼の出現が
要望されζいたわけである。However, ferritic stainless steel has a problem in that the plastic behavior differs in the width direction of the plate, resulting in unevenness (ridging) in the press-formed product, which significantly impairs the beauty of the surface. In addition, ferritic stainless steel with excellent welding workability has been desired in order to improve production efficiency of parts. On the other hand, as mentioned above, their corrosion resistance is inferior to that of austenitic stainless steel, and problems such as rusting may occur during use of these members, so there has been a desire to improve their corrosion resistance. In other words, there has been a demand for a ferritic stainless steel with excellent rust resistance, surface quality after press forming, and weldability.
従来、これらの点を改善しようとする試みがなされてお
り、例えば特開昭５９−８５８／１８号公報に見られる
ようにフェライト系ステンレス鋼のＢＡ材の耐誘性改善
があり、また米国特許第２８５１３８４号明細書で報告
されているようなプレス加工面の表面性状改善を試みた
ものもある。In the past, attempts have been made to improve these points; for example, as seen in JP-A-59-858/18, there has been an improvement in the induction resistance of ferritic stainless steel BA material, and a U.S. patent Some attempts have been made to improve the surface properties of pressed surfaces, as reported in No. 2,851,384.
しかしながら、これらの従来技術にあたってはフェライ
ト系ステンレス鋼の前述の欠点の一部のみに着目して検
討されたものであり、すべての欠点を解決し得るもので
はない。従って、今まで種々の検討がなされてきている
ものの、耐誘性、プレス成形後の表面性状および溶接性
における問題点を一挙に解決したフェライト系ステンレ
ス鋼は存在しなかった。However, these conventional techniques have been studied focusing only on some of the above-mentioned drawbacks of ferritic stainless steel, and cannot solve all of the drawbacks. Therefore, although various studies have been made to date, there has not been a ferritic stainless steel that has solved all the problems in induction resistance, surface texture after press forming, and weldability.
〈発明が解決しようとする課題〉
そこで、本発明はこれらの状勢に鑑み、従来にはない溶
接作業性、耐錆性およびプレス成形後の表面性状に優れ
たフェライト系ステンレス鋼を提供するものである。<Problems to be Solved by the Invention> In view of these circumstances, the present invention provides a ferritic stainless steel that has unprecedented welding workability, rust resistance, and surface quality after press forming. be.
く課題を解決するだめの手段〉
すなわち、本発明は重量％として、Ｃ，ｒ ： １６〜
２０％、 Ｍｎ ： ０．２５％以下、Ｓｉ：１．０％
以下、八ｌ ： ０．０４〜０．２％、Ｃ：０．０３〜
０．０８％、１０．０３〜０．０７％。Means for Solving the Problem> That is, the present invention has C,r: 16 to 16% by weight.
20%, Mn: 0.25% or less, Si: 1.0%
Below, 8l: 0.04~0.2%, C: 0.03~
0.08%, 10.03-0.07%.
Ｓ ： ０．００３〜００１５％を含み残部がＦｅおよ
び不可避的不純物からなることを特徴とする耐銹性、表
面性状および溶接性に優れたフェライト系ステンレス鋼
であり、その骨子とするところは、フェライト系ステン
レス鋼のＭｎの低減とＡＩの積極的添加により耐錆性の
改善を、ＣおよびＮの規制により表面性状の向上を、ま
たＳ量の規制により溶接性の改善を達成した点にある。It is a ferritic stainless steel with excellent rust resistance, surface texture and weldability, characterized by containing S: 0.003-0015% with the remainder consisting of Fe and unavoidable impurities, and its main points are: We have improved rust resistance by reducing Mn and actively adding AI to ferritic stainless steel, improved surface quality by regulating C and N, and improved weldability by regulating the amount of S. .
〈作 用〉
本発明者らは、小型鋼塊を用い耐錆性２表面性状および
溶接性に優れたフェライト系ステンレス鋼を開発する過
程においてフェライト系ステンレス鋼の耐食性は鋼中Ｓ
の減少とともに改善されるものの、極低Ｓ量では溶鋼の
渦流れが悪く、溶接性に劣ることを見出した。<Function> In the process of developing ferritic stainless steel with excellent rust resistance 2 surface properties and weldability using small steel ingots, the present inventors discovered that the corrosion resistance of ferritic stainless steel was
It has been found that although the S content improves as the S content decreases, the vortex flow of the molten steel is poor at extremely low S content, resulting in poor weldability.
そこで鋼中Ｓをある程度含有したフェライト系ステンレ
ス鋼の耐誘性改善について検討したところ、Ｍｎの低減
とＡＩの積極的添加によりｓｌがある程度含有していて
も耐錆性が低下しないことを見出した。すなわち、Ｍｎ
量の減少はフェライト系ステンレス鋼板の耐錆性に有害
なＭｎＳを減少させるとともにＢＡ材においてはその酸
化皮膜中のＭｎＣｒｚＯｎが耐食性に有害であり、Ｍｎ
の減少により耐食性が著しく向上することを見出した。Therefore, we investigated how to improve the induction resistance of ferritic stainless steel containing a certain amount of S in the steel, and found that by reducing Mn and actively adding AI, the rust resistance did not deteriorate even if it contained a certain amount of sl. . That is, Mn
Reducing the amount of MnS reduces MnS, which is harmful to the rust resistance of ferritic stainless steel sheets, and MnCrzOn in the oxide film of BA materials is harmful to the corrosion resistance.
It has been found that corrosion resistance is significantly improved by decreasing the
一方、Ｍの積極的添加は微細な多数のＡｌｔｏｓを形成
させ、耐食性に有害なＭｎＳを微細分散させることによ
り、耐食性の向上をもたらすとともにＢＡ材ではその酸
化皮膜中のＭｎＣｒｚＯ４の表層濃化がさらに抑制され
るため耐食性が一層向上することが判明した。On the other hand, active addition of M forms a large number of fine Altos and finely disperses MnS, which is harmful to corrosion resistance, thereby improving corrosion resistance. It was found that corrosion resistance was further improved due to the suppression of corrosion.
またプレス加工後の表面性状改善にはＣ，Ｎ量の規制が
有効であることを見出した。We have also found that regulating the amounts of C and N is effective in improving the surface quality after press working.
以下これらの知見に基づき本発明のフェライト系ステン
レス鋼の化学成分の限定理由を述べる。Based on these findings, the reasons for limiting the chemical components of the ferritic stainless steel of the present invention will be described below.
Ｍｎ： Ｍｎは耐食性に有害であり、耐食性に有害な
ＭｎＳやＢＡ皮膜中にＭｎＣｒｚＯａの生成を助長する
。Mn: Mn is harmful to corrosion resistance and promotes the formation of MnS and MnCrzOa in the BA film, which are harmful to corrosion resistance.
第１図に示すごと＜Ｍｎが０．２５％を越えると耐食性
が著しく低下するのでその上限を０．２５％に限定する
。またＭｎが低くても他に何ら悪影響を与えないのでそ
の下限については特に限定しない。As shown in FIG. 1, if the Mn content exceeds 0.25%, the corrosion resistance will drop significantly, so the upper limit is limited to 0.25%. Furthermore, even if the Mn content is low, it does not have any adverse effects on other components, so the lower limit is not particularly limited.
ＡＩ：ＡＩは耐食性改善に有効な元素であり耐錆性の面
から０．０４％以上の添加が不可欠である。しかし、Ａ
ｌが０．２０％を越えると耐リジング性が低下するので
その上限を０．２０％に限定した。AI: AI is an element effective in improving corrosion resistance, and from the viewpoint of rust resistance, it is essential to add 0.04% or more. However, A
If l exceeds 0.20%, the ridging resistance decreases, so the upper limit was limited to 0.20%.
Ｓｔ： Ｓｉは溶接性および耐食性に、殆ど影響を及
ぼさないが１．０％を越えると耐リジング性が低下する
のでその上限を１．０％に限定する。St: Si has almost no effect on weldability and corrosion resistance, but if it exceeds 1.0%, the ridging resistance decreases, so the upper limit is limited to 1.0%.
Ｃｒ： 耐食性の面より１６％以上が不可欠であるが
２０％を越えると耐リジング性が低下するのでその」１
限を２０％に限定する。Cr: From the viewpoint of corrosion resistance, 16% or more is essential, but if it exceeds 20%, the ridging resistance will decrease, so 1.
limit to 20%.
Ｃ，Ｎ：Ｃ，Ｎがそれぞれ０．０３％未満であると耐リ
ジング性が著しく低下するので、その下限をそれぞれ０
．０３％に限定する。しかしＣ，Ｎがそれぞれ０．０８
％、 ０．０７％を越えると硬質となり、プレス加工性
が低下するので、その」１限をそれぞれ０．０８％、
０．０７％に限定する。C, N: If C and N are each less than 0.03%, the ridging resistance will decrease significantly, so the lower limit is set to 0.
．． Limited to 0.3%. However, C and N are each 0.08
%, if it exceeds 0.07%, it becomes hard and press workability decreases, so the 1st limit is 0.08%, respectively.
Limited to 0.07%.
Ｓ： Ｓは溶接性の向上に有効な元素であり、０．００
３％未満で著しく溶接性が低下するのでその下限を０．
００３％とし、また耐食性の点からその上限を０．０１
５％に限定する。S: S is an element effective in improving weldability, and 0.00
If it is less than 3%, weldability deteriorates significantly, so the lower limit is set at 0.
003%, and the upper limit is 0.01% from the viewpoint of corrosion resistance.
Limited to 5%.
〈実施例〉 以下実施例について述べる。<Example> Examples will be described below.
表１に示す成分の真空高周波溶解（３０ｋｇ小型鋼塊）
を用いて、公知の条件で熱間圧延および冷間圧延を行い
、１ｍｍ厚の冷延板とした。引き続き、８５０°ｃｘｉ
分の条件で仕上げ焼鈍した後、＃５００エメリーペーパ
ーで研磨したものについて耐食性。Vacuum high-frequency melting of the ingredients shown in Table 1 (30kg small steel ingot)
Hot rolling and cold rolling were performed under known conditions to obtain a cold rolled sheet with a thickness of 1 mm. Continue to 850°cxi
Corrosion resistance of those polished with #500 emery paper after finish annealing under the conditions of 10 minutes.
耐リジング性、溶接性について調査を行った。なお耐食
性については冷延板を１１５００エメリーペーパーで研
磨後８５０°Ｃ，露点−５０〜−６０゛Ｃの条件で光輝
焼鈍したものについても調査した。We investigated ridging resistance and weldability. Corrosion resistance was also investigated using cold-rolled plates that were polished with 11500 emery paper and then brightly annealed at 850°C and a dew point of -50 to -60°C.
耐食性は３．５％ＮａＣＺ ５０°Ｃで〔１６時間噴霧
＋８時間保持〕の条件で塩水噴霧試験（ｓｓ′ｒ）後、
試験片の腐食面積率（％）により評価した。Corrosion resistance was determined after a salt spray test (ss'r) using 3.5% NaCZ at 50°C (16 hours of spraying + 8 hours of holding).
Evaluation was made based on the corrosion area rate (%) of the test piece.
耐リング性については圧延方向２０％引張変形後のリジ
ングの程度を目視により４段階で評価した。Regarding ring resistance, the degree of ridging after 20% tensile deformation in the rolling direction was visually evaluated on a four-grade scale.
溶接性についてはＴＴＧ？８接（トーチＡｒ量１５１／
分１重ガスＡｒ量７ｐ、／分、タングステン電極；トリ
ューム人２．４ｍｍφ）を行い溶接可能最大溶接速度に
より評価した。表２にその結果を示す。本発明鋼の１〜
８は耐食性、溶接性および耐リジング性がいずれも極め
て優れている。しかし一方、比較鋼は上記の３点をすべ
て満足し得なく汎用鋼として問題がある。TTG for weldability? 8 contacts (torch Ar amount 151/
Welding was performed using a heavy gas Ar amount of 7 p/min, tungsten electrode; 2.4 mm diameter) and evaluated based on the maximum welding speed that can be welded. Table 2 shows the results. Inventive steel 1~
No. 8 has extremely excellent corrosion resistance, weldability, and ridging resistance. However, on the other hand, the comparative steel cannot satisfy all three points mentioned above and has problems as a general-purpose steel.
表１
表２
〈発明の効果〉
本発明鋼は耐錆性１表面性状および溶接性の３つを満足
し、またコストが安価なため例えば厨房用や装飾用など
の分野に広く、有利に用いることが可能になった。Table 1 Table 2 <Effects of the Invention> The steel of the present invention satisfies the following three requirements: rust resistance, surface properties, and weldability, and is inexpensive, so it is widely and advantageously used in fields such as kitchens and decorations. It became possible.
第１図は、Ｍｎ含有量と腐食面積率の関係を示すグラフ
である。
特許出願人 川崎製鉄株式会社
第１図
Ｍｎ （重量％）FIG. 1 is a graph showing the relationship between Mn content and corrosion area ratio. Patent applicant: Kawasaki Steel Corporation Figure 1 Mn (% by weight)
Claims (1)
．０％以下、Ａｌ：０．０４〜０．２％、Ｃ：０．０３
〜０．０８％、Ｎ：０．０３〜０．０７％、Ｓ：０．０
０３〜０．０１５％ を含み残部がＦｅおよび不可避的不純物からなることを
特徴とする耐銹性、表面性状および溶接性に優れたフェ
ライト系ステンレス鋼。[Claims] As weight %, Cr: 16 to 20%, Mn: 0.25% or less, Si: 1
．． 0% or less, Al: 0.04-0.2%, C: 0.03
~0.08%, N: 0.03~0.07%, S: 0.0
03 to 0.015%, with the remainder consisting of Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14056588A JPH01312058A (en) | 1988-06-09 | 1988-06-09 | Ferritic stainless steel excellent in rust resistance, surface characteristic, and weldability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14056588A JPH01312058A (en) | 1988-06-09 | 1988-06-09 | Ferritic stainless steel excellent in rust resistance, surface characteristic, and weldability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01312058A true JPH01312058A (en) | 1989-12-15 |
Family
ID=15271641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14056588A Pending JPH01312058A (en) | 1988-06-09 | 1988-06-09 | Ferritic stainless steel excellent in rust resistance, surface characteristic, and weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01312058A (en) |
-
1988
- 1988-06-09 JP JP14056588A patent/JPH01312058A/en active Pending
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