JPH05306435A - Fe-cr alloy excellent in workability and corrosion resistance - Google Patents
Fe-cr alloy excellent in workability and corrosion resistanceInfo
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- JPH05306435A JPH05306435A JP11101392A JP11101392A JPH05306435A JP H05306435 A JPH05306435 A JP H05306435A JP 11101392 A JP11101392 A JP 11101392A JP 11101392 A JP11101392 A JP 11101392A JP H05306435 A JPH05306435 A JP H05306435A
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は加工性および耐食性に優
れた高純度のFe−Cr合金に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-purity Fe-Cr alloy excellent in workability and corrosion resistance.
【0002】[0002]
【従来の技術】一般にFe−Cr合金は耐食性に優れた
材料として知られているが、耐食性および加工性の改善
も含めてFe−Cr合金の物性の改良が以下に例示のご
とくに各種提案されている。2. Description of the Related Art Generally, an Fe--Cr alloy is known as a material having excellent corrosion resistance, but various improvements such as the corrosion resistance and workability of the Fe--Cr alloy have been proposed as exemplified below. ing.
【0003】特公昭63−58904号公報ではCr含
量11.0〜16.0重量%のFe−Cr合金で、特に
Ti含量を特定量とした張り出し性および二次加工性に
優れたフェライト系ステンレス鋼を提案している。In Japanese Examined Patent Publication No. 63-58904, an Fe-Cr alloy having a Cr content of 11.0 to 16.0% by weight, in particular, a ferritic stainless steel having a Ti content as a specific amount and being excellent in overhanging property and secondary workability. Proposing steel.
【0004】特公昭64−6264号公報ではCr含量
8.0〜35.0重量%のFe−Cr合金で、特にS
i,MnおよびNbを各々特定量含有せしめた耐銹性に
優れたステンレス鋼光輝焼鈍材を提案している。JP-B-64-6264 discloses a Fe-Cr alloy having a Cr content of 8.0 to 35.0% by weight, especially S
It proposes a stainless steel bright annealed material which contains i, Mn and Nb in specific amounts and has excellent rust resistance.
【0005】特公平2−1902号公報ではCr含量が
20.0重量%を越え25重量%以下のFe−Cr合金
で、特にMo,MnおよびNbを各々特定量含有せしめ
た溶接時の耐高温割れ性および溶接部靱性に優れた耐食
性フェライトステンレス鋼を提案している。In Japanese Patent Publication No. 2-1902, a Fe-Cr alloy having a Cr content of more than 20.0% by weight and 25% by weight or less, in particular, Mo, Mn and Nb each containing a specific amount of high temperature resistance during welding. We propose a corrosion-resistant ferritic stainless steel with excellent crackability and weld toughness.
【0006】特開昭61−186451号公報ではCr
含量が25〜50重量%のFe−Cr合金で、特にS
i,MnおよびMoを特定量含有せしめた耐サワー性に
優れた合金を提案している。In JP-A-61-186451, Cr is used.
Fe-Cr alloy with a content of 25 to 50% by weight, especially S
It proposes an alloy containing specific amounts of i, Mn and Mo and having excellent sour resistance.
【0007】特開昭62−267450号公報ではCr
含量16〜19重量%のFe−Cr系合金であって、特
にMoを特定量含有せしめた耐粒界腐食性に優れる高純
度フェライト系ステンレス鋼を提案している。In JP-A-62-267450, Cr is used.
A high-purity ferritic stainless steel, which is an Fe-Cr alloy having a content of 16 to 19% by weight, and in which a specific amount of Mo is particularly contained and which is excellent in intergranular corrosion resistance, is proposed.
【0008】特開平1−287253号公報ではCr含
量15〜26重量%、Al含量4〜6重量%のFe−C
r−Al合金であって、希土類元素を少量特定量含有せ
しめた耐酸化性および製造性に優れたAl含有フェライ
ト系ステンレス鋼を提案している。In Japanese Patent Laid-Open No. 1-287253, Fe-C having a Cr content of 15 to 26% by weight and an Al content of 4 to 6% by weight.
It proposes an Al-containing ferritic stainless steel which is an r-Al alloy and which contains a small amount of a specified amount of a rare earth element and is excellent in oxidation resistance and manufacturability.
【0009】特開平2−232344号公報ではCr含
量25.0〜30.0重量%のFe−Cr系合金であっ
て、特にMoを特定量含有せしめた耐生物付着性および
耐海水性に優れたフェライト系ステンレス鋼を提案して
いる。In Japanese Patent Laid-Open No. 2-232344, a Fe-Cr alloy having a Cr content of 25.0 to 30.0% by weight is used, and in particular, a specific amount of Mo is contained, which is excellent in biofouling resistance and seawater resistance. Ferritic stainless steel is proposed.
【0010】特開平3−2355号公報ではCr含量1
6.0〜25.0重量%のFe−Cr合金であって、特
にNbをCとNの合計量との比において特定量含有せし
めた冷間加工性、靱性、耐食性に優れたフェライト系ス
テンレス鋼を提案している。In Japanese Patent Application Laid-Open No. 3-2355, the Cr content is 1
A ferritic stainless steel having a Fe-Cr alloy content of 6.0 to 25.0% by weight, in which Nb is contained in a specific amount in the ratio of the total amount of C and N and which is excellent in cold workability, toughness, and corrosion resistance. Proposing steel.
【0011】[0011]
【発明が解決しようとする課題】しかしながら、これら
の先行技術において提案されたFe−Cr合金は、耐食
性および成形性のいずれをも充分に満たすものではな
い。一般的にCr量の増加と共に耐食性は増加するが、
反面、延性が低下して加工性が低下する。上記の種々の
提案では、ステンレス鋼の最も重要な特性である耐食性
を損なわないようCr量を比較的多く使用しているの
で、加工性を犠牲にしている。前記特開平3−2355
号公報では、Nbを特定量加えて加工性の向上を狙って
いるが、それでもなお限界がある。また、当然ながらC
rの多量の使用は合金のコストが高くなる。However, the Fe-Cr alloys proposed in these prior arts do not sufficiently satisfy both corrosion resistance and formability. Generally, the corrosion resistance increases as the Cr content increases,
On the other hand, the ductility decreases and the workability decreases. In the above various proposals, workability is sacrificed because a relatively large amount of Cr is used so as not to impair the corrosion resistance, which is the most important characteristic of stainless steel. JP-A-3-2355
In the gazette, a specific amount of Nb is added to improve workability, but there is still a limit. Also, of course C
The use of large amounts of r increases the cost of the alloy.
【0012】かくして、本発明の目的は耐食性および成
形性が高い水準でバランスが取れ、しかも安価に製造し
得るFe−Cr合金を提供することである。Thus, it is an object of the present invention to provide a Fe-Cr alloy which is well balanced in corrosion resistance and formability and can be manufactured at low cost.
【0013】[0013]
【課題を解決するための手段】本発明者は、上記目的を
達成すべく鋭意研究を行った結果、従来Fe−Cr合金
に存在していたC,N,O,P,Sなどの不純物を低下
させ、不可避的に存在したか、あるいは積極的に添加す
る場合もあるAl,Tiなどの元素の存在量を低下させ
た結果、意外にも極めて高純度で比較的低Cr含量のF
e−Cr合金が上記目的を達成することを見い出し、本
発明を完成するに至った。As a result of earnest studies to achieve the above object, the present inventor has found that impurities such as C, N, O, P and S, which were conventionally present in Fe-Cr alloys, are removed. As a result of reducing the existing amount of elements such as Al and Ti which are unavoidably present or may be positively added, as a result of surprisingly high purity and relatively low Cr content of F,
It has been found that the e-Cr alloy achieves the above object, and has completed the present invention.
【0014】すなわち、本発明によればFeとCrの合
計含量が99.98重量%以上かつCr含量が0.5〜
12重量%である加工性と耐食性に優れた超高純度のF
e−Cr合金が提供される。That is, according to the present invention, the total content of Fe and Cr is 99.98% by weight or more and the content of Cr is 0.5 to.
Ultra-high purity F with excellent workability and corrosion resistance of 12% by weight
An e-Cr alloy is provided.
【0015】[0015]
【作用】本発明の理解のために、図面を用いて説明す
る。図1は、供試材(Fe−11.2%Cr)の引張試
験により伸びを測定した結果を示すものである。この図
から明らかなように、Fe,Cr以外の成分の総和が
0.02重量%未満、即ちFeとCrの合計量が99.
98%以上の場合において伸びが極めて高いことが明ら
かである。To understand the present invention, description will be given with reference to the drawings. FIG. 1 shows the results obtained by measuring the elongation of a test material (Fe-11.2% Cr) by a tensile test. As is clear from this figure, the sum of the components other than Fe and Cr is less than 0.02% by weight, that is, the total amount of Fe and Cr is 99.
It is clear that the elongation is extremely high in the case of 98% or more.
【0016】なお、試験片の調製および測定法は以下の
ごとくである。 試験片:10kg真空炉で溶解、鋳造し、熱間で4mm
厚まで圧延後、再結晶焼鈍し、脱スケール後冷間で0.
7mm厚まで圧延後、再結晶焼鈍し、供試材とした。 測定法:試験片を圧延方向に対してL方向、C方向、X
方向より採取し、JIS Z−2241に準拠した引張
試験により伸びとして、各方向の平均すなわち(L+C
+2×X)/4で求めた。The method for preparing and measuring the test piece is as follows. Test piece: 10 kg, melted and cast in a vacuum furnace, hot 4 mm
After rolling to thickness, recrystallization annealing was performed, and descaling was followed by cold cooling.
After rolling to a thickness of 7 mm, recrystallization annealing was performed to obtain a test material. Measurement method: L-direction, C-direction, X-direction of the test piece with respect to the rolling direction
Samples were taken from each direction, and the tensile test based on JIS Z-2241 gave the average of each direction, that is, (L + C
+ 2 × X) / 4.
【0017】図2は、FeとCrの合計量が99.98
重量%以上および99.98重量%未満の各々の合金に
つき、Cr含量と耐食性の試験を行った結果を示してい
る。In FIG. 2, the total amount of Fe and Cr is 99.98.
The results of the Cr content test and the corrosion resistance test are shown for each of the alloys of more than or equal to wt% and less than 99.98 wt%.
【0018】耐食性は、大気暴露試験を6ケ月間行い、
以下のように評価した。 A:赤錆全くなし B:わずかに赤錆発生 C:赤錆中程度発生 D:著しく赤錆発生 試験片の調製:10kg真空炉で溶解、鋳造し、熱間で
4mm厚まで圧延後、再結晶焼鈍し、脱スケール後冷間
で0.7mm厚まで圧延後、再結晶焼鈍した鋼板表面を
エメリー#500研磨して試験に供した。 試験法:千葉の海岸地区(海岸線より10mのところ)
で6ケ月間暴露した。The corrosion resistance was evaluated by carrying out an atmospheric exposure test for 6 months.
It evaluated as follows. A: No red rust at all B: Slight red rust occurred C: Red rust was moderately generated D: Significant red rust occurred Preparation of test piece: 10 kg melting in a vacuum furnace, casting, hot rolling to 4 mm thickness, recrystallization annealing, After descaling, it was cold rolled to a thickness of 0.7 mm, and the recrystallized annealed steel plate surface was polished by Emery # 500 and used for the test. Test method: Chiba coastal area (10m from the coastline)
Exposed for 6 months.
【0019】図2から明らかなように、FeとCrの合
計量が99.98重量%以上の場合、Cr含量が0.5
重量%から耐食性が向上し、5重量%以上となると著し
く耐食性に優れることが明らかである。As is clear from FIG. 2, when the total amount of Fe and Cr is 99.98% by weight or more, the Cr content is 0.5.
It is clear that the corrosion resistance is improved from the weight percent, and the corrosion resistance is remarkably excellent when it is 5 weight percent or more.
【0020】一方、FeとCrの合計量が99.98重
量%未満の場合、Cr含量が10%以上になってはじめ
て耐食性が改善されることがわかる。すなわち、Fe−
Cr系合金で著しく高純度化することにより、極低Cr
量で耐食性が良好となることがわかる。従来、18%程
度必要であったCr量が(Fe+Cr)≧99.98重
量%とすることにより、2.5%程度で同等の耐食性が
得られる。On the other hand, when the total amount of Fe and Cr is less than 99.98% by weight, it can be seen that the corrosion resistance is improved only when the Cr content is 10% or more. That is, Fe-
Extremely low Cr due to extremely high purity with Cr-based alloy
It can be seen that the corrosion resistance becomes good depending on the amount. Conventionally, by setting the amount of Cr required to be about 18% to (Fe + Cr) ≧ 99.98% by weight, equivalent corrosion resistance can be obtained at about 2.5%.
【0021】[0021]
【構成】以下、本発明の構成を詳述する。本発明のFe
−Cr合金のFeとCrの合計量は99.98重量%以
上である。99.98重量%未満であると、〔作用〕の
項で述べたように延性が低下すると共に、耐食性も低
い。FeとCrの合計量が上記範囲であることによっ
て、延性と耐食性の両方が高い水準となる。[Structure] The structure of the present invention is described in detail below. Fe of the present invention
The total amount of Fe and Cr in the -Cr alloy is 99.98% by weight or more. If it is less than 99.98% by weight, the ductility is lowered and the corrosion resistance is also low as described in the section [Operation]. When the total amount of Fe and Cr is within the above range, both ductility and corrosion resistance are high.
【0022】また、Cr含量は0.5〜12重量%、好
ましくは2〜12重量%である。Cr含量が12重量%
を超えた場合、本発明の検討範囲内では特に耐食性が優
れることもなく、むしろ延性が低下するとともに、コス
ト的にも高くなる。The Cr content is 0.5 to 12% by weight, preferably 2 to 12% by weight. Cr content is 12% by weight
If it exceeds, the corrosion resistance is not particularly excellent within the scope of the present invention, rather the ductility is lowered and the cost is increased.
【0023】このようにFeとCrの合計量が99.9
8重量%以上で、しかもCr:0.5〜12重量%とす
ることにより、著しく高耐食性で高加工性を有するFe
−Cr合金が得られる。Thus, the total amount of Fe and Cr is 99.9.
Fe having a remarkably high corrosion resistance and a high workability by containing 8% by weight or more and Cr: 0.5 to 12% by weight.
-Cr alloy is obtained.
【0024】従来のFe−Cr合金に通常含有されてい
る不純物元素とては、C,N,O,P,S,Si,M
n,Al,Mo,Ti,V,Nb,W,Zr,Ta,
B,Ni,Cu,Co,Ca,Mgなどがあるが、Fe
+Cr≧99.98%であればよいので、これら不純物
元素の量を個々には規定しない。Impurity elements usually contained in conventional Fe-Cr alloys include C, N, O, P, S, Si and M.
n, Al, Mo, Ti, V, Nb, W, Zr, Ta,
B, Ni, Cu, Co, Ca, Mg, etc., but Fe
Since + Cr ≧ 99.98% is sufficient, the amounts of these impurity elements are not individually specified.
【0025】このような超高純度のFe−Cr合金を製
造するには、原料として高純度電解鉄と電解Crを所定
量用いることで達成される。いずれの原料も、主たる不
純物は酸素であり、この酸素を除去するために、10-7
torrよりも高い超高真空下で溶解、鋳造することに
より本発明の超高純度のFe−Cr合金を製造すること
ができる。また、本発明合金は、熱延焼鈍板、冷延焼鈍
板で用いられても十分に効果が生じるとともに、冷延焼
鈍板においては表面仕上げが2D,2B,BA,HL,
研磨、鏡面などのいずれでもかまわない。The production of such an ultrahigh-purity Fe--Cr alloy is achieved by using a predetermined amount of high-purity electrolytic iron and electrolytic Cr as raw materials. The main impurity of all the raw materials is oxygen, and in order to remove this oxygen, 10 −7
The ultra-high purity Fe-Cr alloy of the present invention can be produced by melting and casting under ultra-high vacuum higher than torr. Further, the alloy of the present invention produces a sufficient effect even when used in a hot-rolled annealed sheet or a cold-rolled annealed sheet, and the surface finish of the cold-rolled annealed sheet is 2D, 2B, BA, HL,
It may be polished or mirror-finished.
【0026】[0026]
【実施例】以下、実施例をもって本発明を具体的に説明
する。 (実施例)表1に示す化学組成を有する鋼を10kg真
空溶解炉で溶製、鋳造し、熱間圧延により板厚4mmの
熱延板とし、再結晶を目的とした熱延板焼鈍を施し、脱
スケール後冷間圧延により板厚0.8mmの冷延板とし
て最終的に再結晶焼鈍し、冷延焼鈍板とした。EXAMPLES The present invention will be specifically described below with reference to examples. (Example) Steel having the chemical composition shown in Table 1 was melted and cast in a 10 kg vacuum melting furnace, hot-rolled into a hot-rolled sheet having a thickness of 4 mm, and annealed for the purpose of recrystallization. Finally, after descaling, cold rolling was performed by cold rolling to finally obtain a cold rolled sheet having a thickness of 0.8 mm, followed by recrystallization annealing to obtain a cold rolled annealed sheet.
【0027】 [0027]
【0028】このようにして得られた鋼板について以下
の試験を行った。 〔加工性の評価〕JIS Z−2241に準拠した引張
試験による伸びの測定と、50%冷間圧延後、C方向に
180°密着曲げ試験を行った時の割れの状況を観察し
た。その結果を表2に示す。The following tests were conducted on the steel sheet thus obtained. [Evaluation of workability] The elongation was measured by a tensile test according to JIS Z-2241, and after 50% cold rolling, the state of cracking was observed when a 180 ° adhesion bending test was performed in the C direction. The results are shown in Table 2.
【0029】 [0029]
【0030】Fe+Cr≧99.98%と超高純度化す
ることにより伸びが改善され、加工性も良好となること
がわかる。一方、Fe+Cr≧99.98%としてもC
rが12%を超えるとCrの固溶強化により伸びが低下
することもわかる。It is understood that the elongation is improved and the workability is improved by the ultra-high purification of Fe + Cr ≧ 99.98%. On the other hand, even if Fe + Cr ≧ 99.98%, C
It can also be seen that when r exceeds 12%, the elongation decreases due to solid solution strengthening of Cr.
【0031】〔耐食性評価〕上記鋼板をエメリー#50
0研磨し、千葉海岸地区(海岸線より10m)で6ケ月
間の大気暴露試験およびJIS Z−2371に準拠し
た塩水噴霧試験(SST)を100時間行った。その結
果を表3に示す。[Evaluation of Corrosion Resistance] The above steel sheet was emery # 50.
After 0 polishing, an atmospheric exposure test for 6 months and a salt spray test (SST) according to JIS Z-2371 were carried out for 100 hours in the Chiba coast area (10 m from the coastline). The results are shown in Table 3.
【0032】 [0032]
【0033】Fe+Cr≧99.98%の高純度とし、
かつCrを0.5%以上含有させることにより、耐食性
が著しく改善されることがわかる。Fe + Cr ≧ 99.98% of high purity,
Moreover, it is understood that the corrosion resistance is remarkably improved by including Cr in an amount of 0.5% or more.
【0034】[0034]
【発明の効果】Fe+Cr≧99.98重量%と超高純
度化したFe−Cr合金は、非常に加工性が良好である
ばかりか、従来鋼の18%Cr鋼と同等の耐食性をわず
か2%Crで得ることができ、著しく耐食性が良好とな
り、加工性および耐食性のいずれも優れた合金を安価に
提供できる可能性がある。EFFECT OF THE INVENTION Fe + Cr ≧ 99.98% by weight of ultra-high purity Fe—Cr alloy not only has very good workability, but also has a corrosion resistance equivalent to that of conventional 18% Cr steel of only 2%. Since it can be obtained with Cr, the corrosion resistance becomes extremely good, and there is a possibility that an alloy excellent in both workability and corrosion resistance can be provided at low cost.
【図1】 Fe,Cr以外の成分の総和と伸びの関係を
示すグラフである。FIG. 1 is a graph showing the relationship between the sum of components other than Fe and Cr and elongation.
【図2】 Cr含量と耐食性の関係を示すグラフであ
る。FIG. 2 is a graph showing the relationship between Cr content and corrosion resistance.
フロントページの続き (72)発明者 矢 沢 好 弘 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 大和田 哲 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 藤 澤 光 幸 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内Front page continuation (72) Inventor Yoshihiro Yazawa 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Technical Research Division, Kawasaki Steel Co., Ltd. (72) Inventor Satoshi Owada 1 Kawasaki-cho, Chuo-ku, Chiba-shi Kawasaki (72) Inventor, Mitsuyuki Fujisawa, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd.
Claims (1)
以上かつCr含量が0.5〜12重量%である加工性と
耐食性に優れたFe−Cr合金。1. The total content of Fe and Cr is 99.98% by weight.
The Fe-Cr alloy having excellent workability and corrosion resistance as described above and having a Cr content of 0.5 to 12% by weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11101392A JP3519421B2 (en) | 1992-04-30 | 1992-04-30 | Fe-Cr alloy with excellent workability and corrosion resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11101392A JP3519421B2 (en) | 1992-04-30 | 1992-04-30 | Fe-Cr alloy with excellent workability and corrosion resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05306435A true JPH05306435A (en) | 1993-11-19 |
JP3519421B2 JP3519421B2 (en) | 2004-04-12 |
Family
ID=14550187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11101392A Expired - Fee Related JP3519421B2 (en) | 1992-04-30 | 1992-04-30 | Fe-Cr alloy with excellent workability and corrosion resistance |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5739047B1 (en) * | 2014-08-12 | 2015-06-24 | トワロン株式会社 | Biological repellent multi-layer resin-coated metal wire and fishing net composed thereof |
-
1992
- 1992-04-30 JP JP11101392A patent/JP3519421B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5739047B1 (en) * | 2014-08-12 | 2015-06-24 | トワロン株式会社 | Biological repellent multi-layer resin-coated metal wire and fishing net composed thereof |
WO2016024448A1 (en) * | 2014-08-12 | 2016-02-18 | トワロン株式会社 | Organism-repellent multilayer resin-coated metal wire and fishing net comprising same |
JP2016040092A (en) * | 2014-08-12 | 2016-03-24 | トワロン株式会社 | Organism repellent multilayer resin-coated metal wire and fishing net made thereof |
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Publication number | Publication date |
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JP3519421B2 (en) | 2004-04-12 |
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