JPH06116652A - Production of fe-cr-al steel sheet excellent in oxidation resistance - Google Patents
Production of fe-cr-al steel sheet excellent in oxidation resistanceInfo
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- JPH06116652A JPH06116652A JP15012093A JP15012093A JPH06116652A JP H06116652 A JPH06116652 A JP H06116652A JP 15012093 A JP15012093 A JP 15012093A JP 15012093 A JP15012093 A JP 15012093A JP H06116652 A JPH06116652 A JP H06116652A
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- gas
- oxidation resistance
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は耐酸性化に優れたＦｅ−
Ｃｒ−Ａｌ薄鋼板の製造方法に関する。FIELD OF THE INVENTION The present invention relates to Fe- which is excellent in acid resistance.
It relates to a method for manufacturing a Cr-Al thin steel sheet.
【０００２】[0002]
【従来の技術】従来、燃焼ガス排気系の機器、装置、暖
房機部品などに使用される高温材料の耐酸化性を改善す
る方法として、特公昭５７−４６９９号などに見られる
ように高Ｃｒ鋼にＡｌ、Ｓｉなどを添加して耐酸化性を
改善する方法、特開昭５８−１７７４３７号などに見ら
れるように高Ａｌ含有に加えて希土類元素を添加するこ
とにより耐酸化性を改善する方法、特公昭５９−４３９
９３号にみられるように研磨やショットピーニングなど
の加工処理を施して耐酸化性を改善する方法などが開示
されている。しかしＡｌ、Ｓｉ、ＲＥＭなどの元素添加
により耐酸化性を改善しても、耐酸化性に大きなばらつ
きが生じる場合があり、安定的な耐酸化性向上は達成さ
れていなかった。2. Description of the Related Art Conventionally, as a method for improving the oxidation resistance of high-temperature materials used in combustion gas exhaust system equipment, devices, heater parts, etc., high Cr content can be found as shown in Japanese Patent Publication No. 57-4699. A method of improving the oxidation resistance by adding Al, Si, etc. to steel, and improving the oxidation resistance by adding a rare earth element in addition to a high Al content as seen in JP-A-58-177437. Method, Japanese Patent Publication Sho 59-439
As disclosed in Japanese Patent No. 93, a method of improving the oxidation resistance by performing processing such as polishing and shot peening is disclosed. However, even if the oxidation resistance is improved by adding elements such as Al, Si, and REM, the oxidation resistance may vary greatly, and stable improvement of the oxidation resistance has not been achieved.
【０００３】[0003]
【発明が解決しようとする課題】従って、本発明は上述
した従来技術の欠点を解消し、耐酸化性の優れたＦｅ−
Ｃｒ−Ａｌ鋼板および箔を安定的に、かつ同組成の圧延
ままの素材や通常の焼鈍処理を施した素材より優れた耐
酸化性を付与する製造方法を提供することを目的とす
る。Therefore, the present invention solves the above-mentioned drawbacks of the prior art and is excellent in oxidation resistance.
An object of the present invention is to provide a manufacturing method for stably providing a Cr-Al steel sheet and a foil with excellent oxidation resistance as compared with an as-rolled material having the same composition or a material subjected to a normal annealing treatment.
【０００４】[0004]
【課題を解決するための手段】本発明は、鋼組成が重量
％でＣｒ：９〜３０％、Ａｌ：１〜８％を含むＦｅ−Ｃ
ｒ−Ａｌ薄鋼板の製造するに際し、圧延後の最終処理
を、熱処理雰囲気としてＨ2 ガス、Ｎ2 ガスおよび不活
性ガスのうちの一種あるいはこれらのうちから選ばれた
２種以上の混合ガスを用い、雰囲気中のＮ2 ガス濃度が
５０％未満（Ｎ2ガスを含まない場合も含む）の場合に
は、熱処理温度をｘ、露点（ｄ．ｐ．）をｙとした直交
座標系において、 Ａ（６００、−４５）、Ｂ（８００、−４５）、Ｃ（１
１００、−１５）、Ｄ（６００、−７５）、Ｅ（１１０
０、−７５） なる点ＡＢＣＥＤＡを直線で結んだ領域内（直線上を含
む）で行い、前記雰囲気中のＮ2 ガス濃度が５０％以上
の場合には、前記直交座標系において、 Ａ（６００、−４５）、Ｂ（８００、−４５）、Ｃ（１
１００、−１５）、Ｆ（１１００、−３１）、Ｇ（６６
０、−７５）、Ｄ（６００、−７５） なる点ＡＢＣＦＧＤＡを直線で結んだ領域内（直線上を
含む）で行うことを特徴とする耐酸化性に優れたＦｅ−
Ｃｒ−Ａｌ薄鋼板の製造方法を提供するものである。According to the present invention, Fe-C is used in which the steel composition contains Cr: 9 to 30% and Al: 1 to 8% by weight.
In the production of the r-Al thin steel sheet, the final treatment after rolling is carried out by using one of H 2 gas, N 2 gas and an inert gas or a mixed gas of two or more selected from these as a heat treatment atmosphere. When the N 2 gas concentration in the atmosphere is less than 50% (including the case where N 2 gas is not included), the heat treatment temperature is x and the dew point (d.p.) is y in the orthogonal coordinate system. A (600, -45), B (800, -45), C (1
100, -15), D (600, -75), E (110
0, −75) within a region (including on a straight line) connecting the points ABCEDA with a straight line, and when the N 2 gas concentration in the atmosphere is 50% or more, A (600 , -45), B (800, -45), C (1
100, -15), F (1100, -31), G (66
Fe, which is excellent in oxidation resistance, characterized by being performed within a region (including on a straight line) where points ABCFGDA of 0, −75) and D (600, −75) are connected by a straight line.
A method for manufacturing a Cr-Al thin steel sheet is provided.
【０００５】さらに、上記鋼板は、下記〜のグルー
プを単独であるいは複合して含有していてもよい。 Ｃ：０．０５重量％以下、Ｓｉ：１．０重量％以下、
Ｍｎ：１．０重量％以下、Ｎ：０．０５重量％以下、
Ｐ：０．０４重量％以下、Ｓ：０．０１重量％以下 Ｎｂ：０．２〜１．０重量％、Ｔｉ：０．０１〜０．
１５重量％、Ｚｒ：０．０１〜１．０重量％、Ｖ：０．
１〜１．０重量％、Ｈｆ：０．１〜０．３重量％、ＲＥ
Ｍ：１．０重量％以下のうち１種または２種以上 Ｍｏ：２．０重量％以下および／またはＣｕ：２．０
重量％以下Further, the above steel sheet may contain the following groups singly or in combination. C: 0.05% by weight or less, Si: 1.0% by weight or less,
Mn: 1.0 wt% or less, N: 0.05 wt% or less,
P: 0.04 wt% or less, S: 0.01 wt% or less, Nb: 0.2 to 1.0 wt%, Ti: 0.01 to 0.
15% by weight, Zr: 0.01 to 1.0% by weight, V: 0.
1 to 1.0% by weight, Hf: 0.1 to 0.3% by weight, RE
M: 1.0% by weight or less, 1 or more types, Mo: 2.0% by weight or less and / or Cu: 2.0
Weight% or less
【０００６】[0006]
【作用】以下に本発明をさらに詳細に説明する。本発明
の素材中のＣｒおよびＡｌは素材の耐酸化性および耐食
性を確保するための基本元素である。一般にＡｌを３重
量％以上含有するＦｅ−Ｃｒ−Ａｌ合金は高温に加熱さ
れた場合、Ａｌが優先酸化され緻密なＡｌ2 Ｏ3 皮膜を
形成し、これがＦｅ−Ｃｒ−Ａｌ合金の耐酸化特性を付
与するものとなる。本発明法で熱処理を行うと、より低
いＡｌ濃度のものでも緻密なＡｌ2 Ｏ3 皮膜を形成し、
優れた耐酸化性を示すようになるが、最低でも１％は必
要である。また、このＡｌ 2 Ｏ3 皮膜を形成せしめるた
めに合金中にＣｒ含有量は９重量％以上必要である。一
方、Ｃｒ含有量が３０重量％、Ａｌ含有量が８重量％を
超えると原料価格の上昇も招くのみならず、熱延板の靱
性および延性が低下するため通常のステンレス鋼製造ラ
インで製造することが困難となる。したがって、Ｃｒの
成分範囲は９〜３０重量％、Ａｌの成分範囲は１〜８重
量％に限定した。The present invention will be described in more detail below. The present invention
Cr and Al in the material of are the oxidation resistance and corrosion resistance of the material
It is a basic element to secure the property. Generally triple Al
Fe-Cr-Al alloys containing more than 1% by weight are not heated to high temperature.
Al is preferentially oxidized and dense Al2O3Film
Formed with the oxidation resistance of Fe-Cr-Al alloy.
Will be given. When heat treatment is performed by the method of the present invention,
Dense Al with a high Al concentration2O3Forms a film,
It shows excellent oxidation resistance, but at least 1% is required.
It is important. Also, this Al 2O3To form a film
Therefore, the Cr content in the alloy must be 9% by weight or more. one
On the other hand, the Cr content is 30% by weight and the Al content is 8% by weight.
If it exceeds, not only the raw material price will rise, but also the toughness of the hot rolled sheet
Since the ductility and ductility are reduced
It becomes difficult to manufacture in-house. Therefore, of Cr
The component range is 9 to 30% by weight, and the Al component range is 1 to 8
Limited to the amount%.
【０００７】また、この種の耐酸化性合金には、耐酸化
性向上あるいは製造性向上のため、Ｌａ、Ｃｅ、Ｙ、Ｎ
ｄなどの希土類元素（ＲＥＭ）やＴｉ、Ｚｒ、Ｈｆ、Ｖ
などの活性元素を添加することが行われているが、本発
明においてもこれらの元素を含有することが望ましい。Further, in order to improve the oxidation resistance or the manufacturability, La, Ce, Y, N are added to this kind of oxidation resistant alloy.
rare earth elements (REM) such as d, Ti, Zr, Hf, V
Although active elements such as the above have been added, it is desirable to contain these elements also in the present invention.
【０００８】上記鋼板は、下記〜のグループを単独
であるいは複合して含有していてもよい。 Ｃ：０．０５重量％以下、Ｓｉ：１．０重量％以下、
Ｍｎ：１．０重量％以下、Ｎ：０．０５重量％以下、
Ｐ：０．０４重量％以下、Ｓ：０．０１重量％以下 Ｎｂ：０．２〜１．０重量％、Ｔｉ：０．０１〜０．
１５重量％、Ｚｒ：０．０１〜１．０重量％、Ｖ：０．
１〜１．０重量％、Ｈｆ：０．１〜０．３重量％、ＲＥ
Ｍ：１．０重量％以下のうち１種または２種以上 Ｍｏ：２．０重量％以下および／またはＣｕ：２．０
重量％以下The above steel sheet may contain the following groups singly or in combination. C: 0.05% by weight or less, Si: 1.0% by weight or less,
Mn: 1.0 wt% or less, N: 0.05 wt% or less,
P: 0.04 wt% or less, S: 0.01 wt% or less, Nb: 0.2 to 1.0 wt%, Ti: 0.01 to 0.
15% by weight, Zr: 0.01 to 1.0% by weight, V: 0.
1 to 1.0% by weight, Hf: 0.1 to 0.3% by weight, RE
M: 1.0% by weight or less, 1 or more types, Mo: 2.0% by weight or less and / or Cu: 2.0
Weight% or less
【０００９】次に、上記成分の限定理由について述べ
る。Ｃ，Ｎは機械的性質および耐食性の点からも少ない
方が望ましい。そこでその上限を両者とも０．０５％以
下とした。Next, the reasons for limiting the above components will be described. From the viewpoints of mechanical properties and corrosion resistance, it is desirable that C and N are small. Therefore, the upper limits of both are set to 0.05% or less.
【００１０】Ｍｎ，Ｓｉ，Ｐ，Ｓは高温脆化を促進する
のでその上限をＭｎ，Ｓｉは１．０重量％、Ｐ，Ｓはそ
れぞれ０．０４重量％、０．０１重量％とする。Since Mn, Si, P, and S promote high temperature embrittlement, the upper limits thereof are 1.0% by weight for Mn and Si, and 0.04% and 0.01% by weight for P and S, respectively.
【００１１】Ｈｆ，ＲＥＭはさらに耐酸化性の向上のた
め、Ｎｂ，Ｔｉ，Ｚｒ，Ｖは耐酸化特性向上およびＡｌ
Ｎの阻止のために添加するが、あまり少なすぎてもその
効果が表れない。また、多すぎても、その固溶限を越え
金属間化合物を析出するなど、耐酸化特性に対する最適
値を越えてしまうのでその上限をそれぞれ下記のように
設けた。即ち、Ｎｂ：０．２〜１．０重量％、Ｔｉ：
０．０１〜０．１５重量％、Ｚｒ：０．０１〜１．０重
量％、Ｖ：０．１〜１．０重量％、Ｈｆ：０．１〜０．
３重量％、ＲＥＭ：１．０重量％以下に制限した。但
し、ＲＥＭは、Ｌａ：０．０１〜０．５重量％、Ｙ：
０．００１〜０．５重量％、Ｎｄ：０．２〜１．０重量
％、Ｃｅ：０．０１〜０．１重量％、Ｙ：０．００１〜
１．０重量％の範囲内で添加するのがより好ましい。Hf and REM further improve the oxidation resistance, and Nb, Ti, Zr, and V improve the oxidation resistance and Al.
Although added to prevent N, its effect does not appear even if it is too small. Further, if the amount is too large, the solid solution limit is exceeded and the intermetallic compound is deposited, so that the optimum value for the oxidation resistance is exceeded, so the upper limits are set as follows. That is, Nb: 0.2 to 1.0% by weight, Ti:
0.01-0.15% by weight, Zr: 0.01-1.0% by weight, V: 0.1-1.0% by weight, Hf: 0.1-0.
3% by weight and REM: 1.0% by weight or less. However, REM is La: 0.01 to 0.5% by weight, Y:
0.001-0.5 wt%, Nd: 0.2-1.0 wt%, Ce: 0.01-0.1 wt%, Y: 0.001-
More preferably, it is added within the range of 1.0% by weight.
【００１２】Ｍｏ，Ｃｕは耐食性が要求される場合には
添加してもよいが、その量が多すぎても加工性を阻害
し、また経済的でもないのでその上限をそれぞれ２．０
％以下に限定する。Mo and Cu may be added when corrosion resistance is required, but if their amounts are too large, they hinder workability and are not economical, so their upper limits are 2.0.
% Or less.
【００１３】これらの素材は圧延後に一般に、加工性を
付与するための軟化を目的として短時間の熱処理が施さ
れるが、本発明者らの研究によると、この熱処理時のガ
ス雰囲気によってその後の高温酸化特性が著しく変化す
ることが明らかになった。These materials are generally subjected to a short time heat treatment after rolling for the purpose of softening for imparting workability. However, according to the research conducted by the present inventors, the subsequent heat treatment causes a gas atmosphere during the heat treatment. It was revealed that the high temperature oxidation characteristics changed significantly.
【００１４】すなわち熱処理雰囲気を、Ｈ2 、不活性ガ
ス（Ｈｅ、Ｎｅ、Ａｒなど）、Ｎ2ガスの一種あるいは
これらのうち選ばれた２種以上の混合ガスとし、かつ低
露点とすることにより、表面酸化皮膜をＡｌ2 Ｏ3 に富
んだ緻密な皮膜にすると耐酸化性が向上する。一方、高
露点で熱処理を行うとＡｌ2 Ｏ3 にＦｅ2 Ｏ3 、Ｃｒ 2
Ｏ3 が混入した酸化皮膜が生成し、著しく耐酸化性が劣
化する。That is, the heat treatment atmosphere is set to H2, Inert moth
S (He, Ne, Ar, etc.), N2A kind of gas or
It is a mixed gas of two or more selected from these and low
By setting the dew point, the surface oxide film becomes Al2O3Wealth
Oxidation resistance is improved by forming a dense film. On the other hand, high
Al heat treatment at dew point2O3To Fe2O3, Cr 2
O3An oxide film mixed with is formed, and the oxidation resistance is extremely poor.
Turn into.
【００１５】本発明者らは、保護性の高いＡｌ2 Ｏ3 皮
膜が安定に生成する熱処理条件を検討した結果、図１に
示した熱処理温度と露点の関係において点ＡＢＣを直線
で結んだ線上を上限とした範囲が適していることが明ら
かになった。露点が低くとも特性上問題はないが、通常
の設備で実用的に熱処理可能な範囲としてその下限を
ｄ．ｐ．＝−７５℃に限定した。The present inventors have examined the heat treatment conditions under which a highly protective Al 2 O 3 film is stably formed. As a result, the relationship between the heat treatment temperature and the dew point shown in FIG. It has been clarified that the range with the upper limit is suitable. Even if the dew point is low, there is no problem in terms of characteristics, but the lower limit is set as the range in which heat treatment can be performed practically using ordinary equipment. p. = Limited to -75 ° C.
【００１６】また熱処理温度、時間は素材の化学組成お
よび板厚により適当な温度、時間を選択することが可能
であるが、６００℃より低い温度では長時間の熱処理に
よっても素材が軟化し難いため、かつ耐酸化性向上に必
要な表面皮膜厚さが得られないため、その下限を６００
℃以上に限定する。一方、１１００℃より高い温度での
熱処理は、特に素材の板厚が０．１ｍｍ以下と薄い場合
に熱処理中に素材が軟化し自重に耐えられなくなるの
で、その上限を１１００℃に限定する。したがって熱処
理条件範囲は、熱処理雰囲気中にＮ2 ガスを含まない場
合あるいは含んでいても５０％以下の場合には、Ａ（６
００、−４５）、Ｂ（８００、−４５）、Ｃ（１１０
０、−１５）、Ｄ（６００、−７５）、Ｅ（１１００、
−７５）なる点ＡＢＣＥＤＡを直線で結んだ領域内（直
線上を含む）に限定する。しかしながら、雰囲気中のＮ
2 ガス量が多くなると、あまり低露点にすると窒化し耐
酸化性を劣化させるので、雰囲気中のＮ2 ガス量が５０
％以上含有する条件の場合、熱処理条件範囲を図１のＡ
（６００、−４５）、Ｂ（８００、−４５）、Ｃ（１１
００、−１５）、Ｄ（６００、−７５）、Ｆ（１１０
０、−３１）、Ｇ（６６０、−７５）なる点ＡＢＣＦＧ
ＤＡを直線で結んだ領域内（直線上を含む）に限定す
る。The heat treatment temperature and time can be selected as appropriate depending on the chemical composition and plate thickness of the material, but at temperatures lower than 600 ° C., the material is less likely to soften even after a long heat treatment. In addition, since the surface coating thickness required to improve oxidation resistance cannot be obtained, the lower limit is set to 600.
Limit to ℃ or above. On the other hand, heat treatment at a temperature higher than 1100 ° C. limits the upper limit to 1100 ° C. because the material softens and cannot bear its own weight during the heat treatment, especially when the material has a thin plate thickness of 0.1 mm or less. Therefore, the heat treatment condition range is A (6) when N 2 gas is not contained in the heat treatment atmosphere or 50% or less even if it is contained.
00, -45), B (800, -45), C (110)
0, -15), D (600, -75), E (1100,
-75) is limited to the area (including the straight line) connecting the points ABCEDA with the straight line. However, N in the atmosphere
When 2 gas quantity increases, since the much degrade the nitrided oxidation resistance to low dew point, N 2 gas content in the atmosphere 50
%, The heat treatment condition range is A in FIG.
(600, -45), B (800, -45), C (11
00, -15), D (600, -75), F (110
0, -31), G (660, -75) point ABCFG
The DA is limited to the area connected by a straight line (including the straight line).
【００１７】また本発明者らの研究によると、熱処理雰
囲気をＨ2 ガス、Ｎ2 ガスおよび不活性ガスのうちの一
種あるいはこれらのうち選ばれた２種以上の混合ガスと
し、かつ雰囲気中のＮ2 ガス濃度を抑制した条件とする
と、素材板あるいは箔の表面に形成されるＡｌ2 Ｏ3 皮
膜中のＡｌ、Ｃｒ、Ｆｅ、Ｎの含有量が変化し、皮膜中
のＡｌ純度が高まりＮ含有量が低下する。この効果は特
に雰囲気ガス中のＮ2の濃度を２０％未満に制限するこ
とにより、顕著に現れる。この純度の高いＡｌ 2 Ｏ3 皮
膜を有する素材は、高温の酸化雰囲気にさらされるとき
Ａｌ2 Ｏ3 皮膜が酸素の拡散障壁として作用する効果が
大きく、圧延ままの素材やＮ2 を２０％以上含有する雰
囲気で熱処理した素材と比較して、一層優れた耐酸化特
性を示す。According to the research conducted by the present inventors, the heat treatment atmosphere
The atmosphere is H2Gas, N2One of gas and inert gas
And a mixed gas of two or more selected from these
And N in the atmosphere2Make the condition that the gas concentration is suppressed
And Al formed on the surface of the material plate or foil2O3leather
The content of Al, Cr, Fe, N in the film changes,
Al purity is increased and N content is decreased. This effect is special
N in atmosphere gas2Concentration of less than 20%
And will be noticeable. This high-purity Al 2O3leather
When the material with the film is exposed to a high temperature oxidizing atmosphere
Al2O3The effect that the film acts as a diffusion barrier for oxygen
Large, as-rolled material or N2Atmosphere containing 20% or more of
Compared to materials that have been heat-treated in an atmosphere, it has better oxidation resistance.
Shows sex.
【００１８】従って、より優れた耐酸化性が要求される
用途に対しては熱処理雰囲気ガス中のＮ2 ガス濃度は２
０％未満とすることが望ましい。ここで窒素濃度を抑制
するための熱処理雰囲気ガスは還元性のＨ2 ガス、Ｈ
ｅ、Ｎｅ、Ａｒなどの不活性ガスのいずれを用いても有
効である。Therefore, the N 2 gas concentration in the heat treatment atmosphere gas is 2 for applications requiring higher oxidation resistance.
It is desirable to set it to less than 0%. The heat treatment atmosphere gas for suppressing the nitrogen concentration is a reducing H 2 gas or H 2 gas.
It is effective to use any inert gas such as e, Ne and Ar.
【００１９】[0019]
【実施例】以下に本発明を実施例に基づいて具体的に説
明する。EXAMPLES The present invention will be specifically described below based on examples.
【００２０】（実施例）表１に本発明成分範囲鋼例およ
び比較鋼例を示す。それぞれ板厚０．５ｍｍから０．０
５ｍｍの冷延ままの板を素材とし、表２、３に示したガ
ス雰囲気および保持時間で熱処理を行った。熱処理した
試料および圧延ままの素材よりそれぞれ幅２０ｍｍ、長
さ３０ｍｍの試験片を切り出し、１１５０℃の大気中で
酸化して耐酸化性を調査した。酸化試験は２４ｈおきに
試験片を取り出し重量変化を測定する方法を採用した。
これよりそれぞれの試料について酸化前からの重量増加
が１．０ｍｇ／ｃｍ2 に到達するまでの時間（Ｔ）を求
め、同組成の圧延ままの試料の到達時間（Ｔ0 ）に対す
る熱処理した試料の到達時間（Ｔ1 ）の比（熱処理によ
る耐酸化性向上比）Ｔ1 ／Ｔ0 を計算し、表１、２中に
示した。(Examples) Table 1 shows examples of steels having a composition of the present invention and comparative steels. Plate thickness 0.5 mm to 0.0
A 5 mm cold-rolled plate was used as a raw material, and heat treatment was performed in the gas atmosphere and the holding time shown in Tables 2 and 3. A test piece having a width of 20 mm and a length of 30 mm was cut out from each of the heat-treated sample and the as-rolled material, and the oxidation resistance was investigated by oxidizing in the atmosphere at 1150 ° C. For the oxidation test, a method of taking out a test piece every 24 hours and measuring a weight change was adopted.
From this, the time (T) until the weight increase from before oxidation reaches 1.0 mg / cm 2 was obtained for each sample, and the time (T 0 ) of the as-rolled sample of the same composition was compared with that of the heat-treated sample. The ratio of arrival time (T 1 ) (ratio of improvement in oxidation resistance by heat treatment) T 1 / T 0 was calculated and shown in Tables 1 and 2.
【００２１】これより同一組成の素材であっても、本発
明の条件で熱処理を行ったものはその熱処理により耐酸
化性がいずれも５０％以上改善されており、その効果は
明白である。中でも雰囲気中のＮ2 ガス量が抑制されて
いるものの改善効果が顕著である。Even if the materials having the same composition are heat-treated under the conditions of the present invention, the oxidation resistance is improved by 50% or more by the heat-treatment, and the effect is obvious. Above all, although the amount of N 2 gas in the atmosphere is suppressed, the improvement effect is remarkable.
【００２２】一方、比較例１、２に示すようにＡｌ含有
量が本発明の範囲より少ないもの（試料Ｎｏ．１０、１
１）は圧延まま材および本発明範囲の熱処理を施した試
料共に、２４ｈの酸化により重量増加量が１ｍｇ／ｃｍ
2 を超え、耐酸化性を要求される用途には不適であるこ
とがわかった。また、素材の組成が本発明範囲にあるも
のであっても、露点が本発明範囲を超える高露点で熱処
理したもの（比較例３）は表面に皮膜中にＡｌ2 Ｏ3 と
ともにＣｒ2 Ｏ3 が生成するため、またＮ2 中でかつ高
露点の雰囲気で熱処理したもの（比較例４）は表面の窒
化のため、いずれも圧延ままの素材より耐酸化性が劣化
した。また、本発明範囲以下の温度で熱処理したもの
（比較例５）は、熱処理によっても有効な表面皮膜が生
成し難く、耐酸化性の改善に至っていない。On the other hand, as shown in Comparative Examples 1 and 2, the Al content is less than the range of the present invention (Sample Nos. 10 and 1).
1) shows that the as-rolled material and the sample subjected to the heat treatment within the scope of the present invention show an increase in weight of 1 mg / cm due to oxidation for 24 hours.
It was found to be unsuitable for applications requiring oxidation resistance in excess of 2 . Further, even if the composition of the material is within the range of the present invention, the one heat-treated at a high dew point with a dew point exceeding the range of the present invention (Comparative Example 3) has Cr 2 O 3 together with Al 2 O 3 in the film on the surface. And the heat-treated product in a high dew point atmosphere in N 2 (Comparative Example 4) had nitriding on the surface, so that the oxidation resistance was lower than that of the as-rolled material. Further, in the case of heat treatment at a temperature not higher than the range of the present invention (Comparative Example 5), it is difficult to form an effective surface film even by heat treatment, and the oxidation resistance has not been improved.
【００２３】[0023]
【表１】 [Table 1]
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【発明の効果】Ｆｅ−Ｃｒ−Ａｌ鋼板および箔に関して
従来技術では優れた耐酸化性を安定して得ることが困難
であったのに対し、本発明の製造方法により同組成の素
材と比較して著しく優れた耐酸化特性（耐酸化性向上比
５０％以上）を安定的に付与することが可能となった。As for the Fe-Cr-Al steel sheet and the foil, it was difficult to stably obtain excellent oxidation resistance in the prior art, whereas the production method of the present invention was compared with the material of the same composition. Thus, it becomes possible to stably impart extremely excellent oxidation resistance characteristics (oxidation resistance improvement ratio of 50% or more).
【図１】 本発明の耐酸化性に優れたＦｅ−Ｃｒ−Ａｌ
薄鋼板の製造に際して好適な熱処理条件範囲を示す図で
ある。1] Fe-Cr-Al excellent in oxidation resistance of the present invention
It is a figure which shows the suitable heat treatment condition range at the time of manufacture of a thin steel plate.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 奥 山 薫 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 清 水 寛 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaoru Okuyama 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division (72) Hiroshi Shimizu Kawasaki-cho, Chuo-ku, Chiba No. 1 Kawasaki Steel Co., Ltd. Technical Research Division
Claims (4)
ｌ：１〜８％を含むＦｅ−Ｃｒ−Ａｌ薄鋼板を製造する
に際し、圧延後の最終処理を、熱処理雰囲気としてＨ2
ガス、Ｎ2 ガスおよび不活性ガスのうちの一種あるいは
これらのうちから選ばれた２種以上の混合ガスを用い、
雰囲気中のＮ2 ガス濃度が５０％未満（Ｎ2 ガスを含ま
ない場合も含む）の場合には、熱処理温度をｘ、露点
（ｄ．ｐ．）をｙとした直交座標系において、 Ａ（６００、−４５）、Ｂ（８００、−４５）、Ｃ（１
１００、−１５）、 Ｄ（６００、−７５）、Ｅ（１１００、−７５） なる点ＡＢＣＥＤＡを直線で結んだ領域内（直線上を含
む）で行い、 前記雰囲気中のＮ2 ガス濃度が５０％以上の場合には、
前記直交座標系において、 Ａ（６００、−４５）、Ｂ（８００、−４５）、Ｃ（１
１００、−１５）、 Ｆ（１１００、−３１）、Ｇ（６６０、−７５）、Ｄ
（６００、−７５） なる点ＡＢＣＦＧＤＡを直線で結んだ領域内（直線上を
含む）で行うことを特徴とする耐酸化性に優れたＦｅ−
Ｃｒ−Ａｌ薄鋼板の製造方法。1. A steel composition comprising Cr: 9 to 30% by weight and A
When producing a Fe-Cr-Al thin steel sheet containing 1: 1 to 8%, the final treatment after rolling is H 2 as a heat treatment atmosphere.
Gas, N 2 gas and one kind of inert gas or a mixed gas of two or more kinds selected from these,
When the N 2 gas concentration in the atmosphere is less than 50% (including the case where N 2 gas is not included), in a rectangular coordinate system where the heat treatment temperature is x and the dew point (d.p.) is y, A ( 600, -45), B (800, -45), C (1
100, -15), D (600, -75), E (1100, -75) in a region in which points ABCEDA are connected by a straight line (including a straight line), and the N 2 gas concentration in the atmosphere is 50. % Or more,
In the Cartesian coordinate system, A (600, -45), B (800, -45), C (1
100, -15), F (1100, -31), G (660, -75), D
Fe- excellent in oxidation resistance, characterized in that it is carried out within a region (including on a straight line) where points ABCFGDA (600, -75) are connected by a straight line.
Method for manufacturing Cr-Al thin steel sheet.
ｒ−Ａｌ薄鋼板の製造方法。2. The steel sheet further comprises C: 0.05 wt% or less, Si: 1.0 wt% or less, Mn: 1.0 wt% or less, N: 0.05 wt% or less, P: 0. Fe-C excellent in oxidation resistance as set forth in claim 1, containing 04% by weight or less and S: 0.01% by weight or less.
Method for manufacturing r-Al thin steel sheet.
５重量％、 Ｚｒ：０．０１〜１．０重量％、Ｖ：０．１〜１．０重
量％、 Ｈｆ：０．１〜０．３重量％、ＲＥＭ：１．０重量％以
下 のうち１種または２種以上を含有する請求項１または２
に記載の耐酸化性に優れたＦｅ−Ｃｒ−Ａｌ薄鋼板の製
造方法。3. The steel sheet further comprises Nb: 0.2 to 1.0% by weight, Ti: 0.01 to 0.1.
5% by weight, Zr: 0.01 to 1.0% by weight, V: 0.1 to 1.0% by weight, Hf: 0.1 to 0.3% by weight, REM: 1.0% by weight or less Claim 1 or 2 containing 1 type (s) or 2 or more types.
The method for producing an Fe-Cr-Al thin steel sheet having excellent oxidation resistance according to 1.
量％以下を含有する請求項１〜３のいずれかに記載の耐
酸化性に優れたＦｅ−Ｃｒ−Ａｌ薄鋼板の製造方法。4. The Fe having excellent oxidation resistance according to claim 1, wherein the steel sheet further contains Mo: 2.0 wt% or less and / or Cu: 2.0 wt% or less. -Cr-Al thin steel sheet manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15012093A JPH06116652A (en) | 1992-06-30 | 1993-06-22 | Production of fe-cr-al steel sheet excellent in oxidation resistance |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17139492 | 1992-06-30 | ||
| JP4-171394 | 1992-06-30 | ||
| JP15012093A JPH06116652A (en) | 1992-06-30 | 1993-06-22 | Production of fe-cr-al steel sheet excellent in oxidation resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06116652A true JPH06116652A (en) | 1994-04-26 |
Family
ID=26479817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15012093A Withdrawn JPH06116652A (en) | 1992-06-30 | 1993-06-22 | Production of fe-cr-al steel sheet excellent in oxidation resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06116652A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2807069A1 (en) * | 2000-03-29 | 2001-10-05 | Usinor | Ferritic stainless steel sheet dip coated with aluminium containing selected rare earth elements for use in the elements of motor vehicle exhaust systems |
| JP2010516903A (en) * | 2007-01-29 | 2010-05-20 | ティッセンクルップ ファオ デー エム ゲゼルシャフト ミット ベシュレンクテル ハフツング | Use of iron-chromium-aluminum alloys that exhibit long life and slight changes in heat resistance |
| JP2011032524A (en) * | 2009-07-31 | 2011-02-17 | Jfe Steel Corp | Stainless steel foil and method for producing the same |
| JP2014198868A (en) * | 2013-03-29 | 2014-10-23 | 日立金属株式会社 | Method of manufacturing stainless steel for solid oxide fuel cell |
-
1993
- 1993-06-22 JP JP15012093A patent/JPH06116652A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2807069A1 (en) * | 2000-03-29 | 2001-10-05 | Usinor | Ferritic stainless steel sheet dip coated with aluminium containing selected rare earth elements for use in the elements of motor vehicle exhaust systems |
| JP2010516903A (en) * | 2007-01-29 | 2010-05-20 | ティッセンクルップ ファオ デー エム ゲゼルシャフト ミット ベシュレンクテル ハフツング | Use of iron-chromium-aluminum alloys that exhibit long life and slight changes in heat resistance |
| JP2011032524A (en) * | 2009-07-31 | 2011-02-17 | Jfe Steel Corp | Stainless steel foil and method for producing the same |
| JP2014198868A (en) * | 2013-03-29 | 2014-10-23 | 日立金属株式会社 | Method of manufacturing stainless steel for solid oxide fuel cell |
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