JP2786529B2 - Surface modification treatment method for austenitic stainless steel - Google Patents
Surface modification treatment method for austenitic stainless steelInfo
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- JP2786529B2 JP2786529B2 JP23250490A JP23250490A JP2786529B2 JP 2786529 B2 JP2786529 B2 JP 2786529B2 JP 23250490 A JP23250490 A JP 23250490A JP 23250490 A JP23250490 A JP 23250490A JP 2786529 B2 JP2786529 B2 JP 2786529B2
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- stainless steel
- austenitic stainless
- weight
- diffusion
- hydrogen gas
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はオーステナイト系ステンレス鋼の表面改質処
理方法に関し、特に同鋼の表面に高硬度、高耐食性を有
するFe−Ni−Cr系金属間化合物のσ相組織を形成させる
方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a surface modification treatment method for austenitic stainless steel, and particularly to a Fe-Ni-Cr metal having high hardness and high corrosion resistance on the surface of the steel. The present invention relates to a method for forming a σ phase structure of a compound.
従来、耐摩耗性を向上させるために、浸炭、窒化など
の表面硬化法が多用されてきたが、腐食環境下において
は硬化層中の炭化物及び窒化物と共存するマトリックス
の腐食が進行するため、摺動部材としてはその用をなさ
ず、これを防止するために摺動部素材の材質を向上させ
た後に上記表面硬化法を行ったり、硬質クロムメッキ処
理を行ったりしている。Conventionally, in order to improve wear resistance, carburizing, surface hardening methods such as nitriding have been frequently used, but under a corrosive environment, the corrosion of the matrix coexisting with the carbide and nitride in the hardened layer proceeds, The sliding member is not used, and in order to prevent this, the surface hardening method or hard chrome plating is performed after improving the material of the sliding portion material.
硬質CrメッキはCr濃度が100％に近いために耐食性が
良好であり、かつメッキ硬度は900Hv前後であるために
耐摩耗性もある。従って高耐食性及び高耐摩耗性が要求
される摺動部材料に利用されている。Hard Cr plating has good corrosion resistance because the Cr concentration is close to 100%, and also has wear resistance because the plating hardness is around 900 Hv. Therefore, it is used as a sliding part material that requires high corrosion resistance and high wear resistance.
しかし、硬質クロムメッキは次のような欠点がある。 However, hard chrome plating has the following disadvantages.
（１） 硬質Crメッキは母材との接合が物理的な結合で
あるために母材との界面で剥離しやすい。(1) Hard Cr plating is easily peeled off at the interface with the base material because the bonding with the base material is a physical bond.
（２） コストが非常に高い。(2) The cost is very high.
本発明者らはオーステナイト系ステンレス鋼の表面に
Crの拡散浸透処理を施す際、ある一定の条件を与えるこ
とにより拡散層組織をFe−Cr−Ni系金属間化合物である
σ相とし、そのσ相が高耐摩耗性、高耐食性を有する有
効な被膜層であることの知見を得、本発明はこの知見に
基づいて完成したものであって、 （１） C:0.02〜0.12重量％、Cr:17〜25重量％、Ni:8
〜14重量％及び数種の添加元素を含む残部Feからなるオ
ーステナイト系ステンレス鋼のCr拡散浸透処理するに際
し、封入する水素ガスが全体に限りなくゆきわたる構造
の鋼板製半密閉容器を用い、該容器内に上記オーステナ
イト系ステンレス鋼をCr拡散浸透処理剤と共に充填し、
1000〜1150℃までの昇温過程では該Cr拡散浸透処理剤重
量1kgに対し100〜250cc/分、昇温後の保持及び冷却過程
では25〜50cc/分の割合で水素ガスを流すことにより、
オーステナイト系ステンレス鋼の表面に高硬度、高耐食
性を有するFe−Cr−Ni系金属間化合物のσ相組織を形成
させることを特徴とするオーステナイト系ステンレス鋼
の表面改質処理方法。The present inventors have found that the surface of austenitic stainless steel
When performing the Cr diffusion and infiltration treatment, by giving certain conditions, the diffusion layer structure becomes a σ phase which is an Fe-Cr-Ni-based intermetallic compound, and the σ phase has high wear resistance and high corrosion resistance. The present invention has been completed on the basis of this finding. (1) C: 0.02 to 0.12% by weight, Cr: 17 to 25% by weight, Ni: 8
When carrying out Cr diffusion and infiltration treatment of austenitic stainless steel consisting of 1414% by weight and the balance of Fe containing several types of additional elements, a semi-closed container made of a steel plate having a structure in which hydrogen gas to be filled is completely extended as much as possible is used. Fill the above austenitic stainless steel with Cr diffusion infiltration treatment agent,
By flowing hydrogen gas at a rate of 100 to 250 cc / min with respect to 1 kg of the Cr diffusion and infiltration agent weight in the temperature rising process up to 1000 to 1150 ° C. and 25 to 50 cc / min in the holding and cooling process after the temperature rise,
A method for modifying the surface of an austenitic stainless steel, comprising forming a σ phase structure of a Fe-Cr-Ni intermetallic compound having high hardness and high corrosion resistance on the surface of the austenitic stainless steel.
（２） 請求項（１）の昇温過程において、60〜90℃の
温水中を通過させた後の湿った水素ガスを使用すること
を特徴とするオーステナイト系ステンレス鋼の表面改質
処理方法。(2) A method for surface-modifying austenitic stainless steel, comprising using wet hydrogen gas after passing through hot water at 60 to 90 ° C in the temperature raising process of (1).
である。It is.
すなわち、本発明の処理方法はFe,Cr,Niの金属間化合
物の中のσ相組織をオーステナイト系ステンレス鋼の表
面に形成させることによって高耐摩耗性、高耐食性を有
する被膜層の形成方法を提供するものである。That is, the treatment method of the present invention forms a σ phase structure in the intermetallic compound of Fe, Cr, and Ni on the surface of austenitic stainless steel, thereby providing a method of forming a coating layer having high wear resistance and high corrosion resistance. To provide.
本発明者らは第１図に示すFe,Cr,Ni系三元状態図中、
高硬度、高耐食性を示すσ相（１の個所）に着目し、こ
の組織を得るため下記実験を実施した。The present inventors have shown in the Fe, Cr, Ni ternary phase diagram shown in FIG.
Focusing on the σ phase (1 point) showing high hardness and high corrosion resistance, the following experiment was performed to obtain this structure.
Cr拡散浸透処理粉末として金属Cr粉65〜80wt％、Al2O
3粉19〜34wt％、NH4Cl粉0.5〜1.0wt％からなる混合粉末
を準備し、鋼板製半密閉容器に充填後、H2ガスを流しな
がら1100℃で10時間のCr富化処理（予備処理）を４回繰
返し行ない、充分Crが富化されたCr拡散浸透処理粉末2k
gを得た。４回の富化処理に際し、毎回粉末を処理ケー
スより取り出しNH4Cl粉を添加し、混合使用した。Metal Cr powder 65-80wt% as Cr diffusion infiltration treatment powder, Al 2 O
3 flour 19~34wt%, preparing a mixed powder consisting of NH 4 Cl powder 0.5 to 1.0%, by filling the steel semi-sealed container, Cr enrichment for 10 hours at 1100 ° C. while flowing H 2 gas ( Preliminary treatment) is repeated 4 times, and the Cr-diffused and infiltrated powder 2k with sufficient Cr enrichment
g was obtained. In each of the four enrichment treatments, the powder was taken out of the treatment case each time, NH 4 Cl powder was added, and mixed and used.
その後、粉末と被処理物であるオーステナイト系ステ
ンレス鋼をキャリア及び雰囲気ガスとして使用するH2ガ
スがケース内全体に行きわたるよう配設された鋼板製半
密閉容器内に埋設、充填し、所定の処理温度例ば1000〜
1150℃までの昇温の過程の間は100〜250cc/minの割合で
H2ガスを流し、所定の処理温度に到達した時点で25〜50
cc/minの流量に落し、３〜15時間の処理を行い、本発明
処理方法によるCr拡散浸透処理材を得た。Thereafter, embedded in a powder and the article to be treated in which austenitic stainless steel carrier and H 2 gas in the provided steel sheet manufactured by a semi-enclosed container as over go throughout the case to be used as the atmospheric gas, filling a predetermined Processing temperature 1000 ~
At a rate of 100 to 250 cc / min during the process of heating up to 1150 ° C
Flowing H 2 gas, 25 to 50 when it reaches the predetermined processing temperature
At a flow rate of cc / min, the treatment was performed for 3 to 15 hours to obtain a Cr-diffused and infiltrated material by the treatment method of the present invention.
本発明者らは所定温度までの昇温の過程においては、
素材オーステナイト系ステンレス鋼中のカーボンが、ま
ず最初に拡散したCrと反応し炭化クロム層を形成し、そ
の後のCrの内部拡散を阻害すると同時にFe,Cr,Ni系の金
属間化合物であるσ相の形成に支障をきたすことを懸念
し、昇温時におけるH2ガス流量を増加させCrの置換反応
の促進と被処理材表面の脱炭をCrが拡散し始める前に行
うことによって炭化クロムの発生を防止した。In the process of raising the temperature to a predetermined temperature, the present inventors
The carbon in the austenitic stainless steel reacts first with the diffused Cr to form a chromium carbide layer, which inhibits the subsequent internal diffusion of Cr and, at the same time, the σ phase, which is an intermetallic compound of the Fe, Cr and Ni series. Of chromium carbide by increasing the flow rate of H 2 gas during heating to accelerate the substitution reaction of Cr and decarburizing the surface of the material to be treated before Cr begins to diffuse. The occurrence was prevented.
なお、ここで昇温時H2ガスを100〜250cc/minの割合で
流した理由は100cc/min以下では被処理物表面の脱炭が
促進されないこと、また250cc/min以上では過剰に脱炭
されるためである。Here, the reason was flowed at a rate of temperature increase during the H 2 gas to 100~250cc / min it is below 100 cc / min not accelerated decarburization of the workpiece surface and excess in 250 cc / min or more decarburization That is because
さらに、キープ温度でH2ガスを25〜50cc/minの割合で
流した理由は、25cc/min以下ではCrの置換反応が十分で
なく、このため目的とする皮膜厚さが得られないこと、
また50cc/min以上ではこれ以上流しても皮膜厚さに変化
がないことによる。Furthermore, the reason that H 2 gas was flowed at a rate of 25 to 50 cc / min at the keep temperature is that at 25 cc / min or less, the substitution reaction of Cr is not sufficient, and the desired film thickness cannot be obtained,
At 50 cc / min or more, there is no change in the film thickness even if the flow rate exceeds this.
特に素材カーボン量の高いSUS 321 HTB等には60〜90
℃に暖めた水中を通した湿ったH2ガスの封入が効果的で
あり、炭化クロム層が形成され難く、そのため層厚の厚
いσ相を形成させることができた。In particular, 60-90 for SUS 321 HTB with high material carbon content
The entrapment of wet H 2 gas through water heated to ° C. was effective, and a chromium carbide layer was hardly formed, so that a thick σ phase could be formed.
なお、ここで温水の温度を60〜90℃に設定した理由
は、Cr拡散浸透処理時の昇温時にH2Oが存在するとCrが
拡散し始める前に脱炭がすみやかに発生し、炭化クロム
の発生を防止できるためであり、この最適温水温度が60
〜90℃であったからである。The reason for setting the temperature of the hot water to 60 to 90 ° C. is that if H 2 O is present at the time of raising the temperature during the Cr diffusion and infiltration treatment, decarburization occurs promptly before Cr begins to diffuse, and chromium carbide This is because the optimal hot water temperature is 60
This is because it was ~ 90 ° C.
ここに用いられる被処理物は、例ば下記に示すサンプ
ルNo.3、４、５、６の如きCr及びNiを含むオーステナイ
ト系ステンレス鋼の中で化学成分が炭素0.02〜0.12重量
％,Cr17〜25重量％,Ni8〜14重量％であれば良く、例ば
サンプルNo.12の如きフェライト系ステンレス鋼、サン
プルNo.7の如き所謂Ni基超合金鋼に対し本発明処理方法
を用いてもσ相組織の形成は見られなかった。The object to be treated here is, for example, an austenitic stainless steel containing Cr and Ni such as Sample Nos. 3, 4, 5, and 6 shown below, in which the chemical component is 0.02 to 0.12% by weight of carbon and 17 to 17% by weight of Cr. It suffices that the treatment method of the present invention be applied to a ferritic stainless steel such as sample No. 12 and a so-called Ni-base superalloy steel such as sample No. No formation of a phase structure was observed.
上記化学組成のオーステナイト系ステンレス鋼の本発
明処理方法に於る要求されるクロム拡散層の厚さは処理
温度及び処理時間を操作する事に依って任意に設定出来
るものである。The thickness of the chromium diffusion layer required in the method of the present invention for treating austenitic stainless steel having the above chemical composition can be arbitrarily set by controlling the processing temperature and the processing time.
〔作用〕 本発明によりオーステナイト系ステンレス鋼の表面に
σ相を形成し高対摩耗性、高耐食の優れた材料を提供で
きるとともに、従来方法の硬質Crメッキに比べ低コスト
で、しかも剥離の起きない安定な被膜層を有する材料の
提供が可能となる。 [Function] According to the present invention, a σ phase can be formed on the surface of austenitic stainless steel to provide a material having high abrasion resistance and high corrosion resistance. It is possible to provide a material having a stable coating layer.
〔実施例−１〕 25×20×5t、15×35×3tのSUS 304製テストピース各
５枚を充分Cr富化処理を行った金属Cr粉75wt％、Al2O3
粉24.5wt％、NH4Cl粉0.5wt％からなる混合粉末と共にケ
ース内全体にH2ガスが行きわたるように配設されたH2ガ
ス封入装置をもつ鋼板製半密閉容器に埋設充填し、室温
から1050℃までの昇温時に180cc/minの流量のH2ガスを
流しながら６時間の昇温期を経過した後、H2ガス流量を
25cc/minにおとし1050℃にて８時間のクロム拡散処理を
行った後、同上のガス流量を流しながら常温まで冷却し
た。[Example-1] 75% by weight of metallic Cr powder, Al 2 O 3 , in which 5 pieces each of 25 × 20 × 5t and 15 × 35 × 3t SUS 304 test pieces were sufficiently Cr-enriched
24.5wt% of powder and 0.5wt% of NH 4 Cl powder were buried and filled in a steel plate semi-closed container with a H 2 gas filling device arranged so that H 2 gas was distributed throughout the case, after a lapse of heating period of 6 hours while flowing H 2 gas flow rate of 180 cc / min at Atsushi Nobori up to 1050 ° C. from room temperature, H 2 gas flow rate
After performing chromium diffusion treatment at 1050 ° C. for 8 hours at 25 cc / min, the mixture was cooled to room temperature while flowing the same gas flow as above.
冷却後、粉末中より取り出して洗浄後、25×20×5tの
SUS 304テストピースを切断、検鏡した光学顕微鏡組織
（300倍）を第２図に、マイクロビッカース硬度測定結
果を第３図に示す。EPMA（Electron Probe X−Ray Micr
oanalyzer）によるFe,Cr,Niの成分分析結果はFe:Cr:Ni
＝50:45:5（wt％）であった。このEPMA分析結果によ
り、その組成は第１図に示すFe,Cr,Ni系三元状態図中の
σ相領域１の範囲内にあることが確認された。同時に15
×35×3tの別のテストピースを用いJIS Z 2371に定める
35℃にて336時間の塩水噴霧試験を行った結果、腐食重
量減は0.23mg/cm2と非常に小さく、優れた耐食性を示し
た。After cooling, take out from the powder and wash, then 25 × 20 × 5t
FIG. 2 shows an optical microscopic structure (× 300) of a SUS 304 test piece cut and observed under a microscope, and FIG. 3 shows a measurement result of a micro Vickers hardness. EPMA (Electron Probe X-Ray Micr
oanalyzer), the result of Fe, Cr, Ni component analysis is Fe: Cr: Ni
= 50: 45: 5 (wt%). From the EPMA analysis result, it was confirmed that the composition was within the range of the σ phase region 1 in the Fe, Cr, Ni ternary phase diagram shown in FIG. 15 at the same time
Specified in JIS Z 2371 using another test piece of × 35 × 3t
As a result of performing a salt spray test at 35 ° C. for 336 hours, the weight loss due to corrosion was extremely small at 0.23 mg / cm 2 , indicating excellent corrosion resistance.
また本発明の処理方法にてCr拡散浸透処理した被処理
材と、５〜50cc/minと昇温、保持、冷却時のH2ガス流量
を変えない従来法によるクロム拡散処理にて得られた被
処理材を15×35×3tの同寸法のSUS 304材を用いて8NHNO
3水溶液中で80℃×100時間の耐食性比較試験を行った結
果、本発明によるものは腐食量0.21mg/cm2、また従来の
クロマイズ処理によるものは0.82mg/cm2と約４倍の耐食
性を示し、耐食性が著しく向上していることを確認し
た。In addition, the material to be treated which has been subjected to the Cr diffusion and infiltration treatment by the treatment method of the present invention, and a chromium diffusion treatment according to a conventional method which does not change the H 2 gas flow rate during heating, holding, and cooling at 5 to 50 cc / min. The material to be treated is 8NHNO using SUS 304 material of the same dimensions of 15 × 35 × 3t.
3 As a result of a corrosion resistance comparison test at 80 ° C. for 100 hours in an aqueous solution, the corrosion resistance of the present invention was 0.21 mg / cm 2 , and that of the conventional chromizing treatment was 0.82 mg / cm 2, which was about 4 times the corrosion resistance. And it was confirmed that the corrosion resistance was significantly improved.
〔実施例−２〕 実施例−１にて使用した混合粉末に新たに0.5wt％のN
H4Cl粉を加え浸透剤とし、150φ×150、130φ×120
のSUS 316製印刷用インキポンプインペラー各１個を前
述の鋼板製半密閉容器に埋設、充填し、昇温時220cc/mi
nの流量のH2ガスを流しながら７時間で昇温の後、25cc/
minのH2ガス流量で1100℃で10時間の処理を行った後、
同上のガス流量を流しながら常温まで冷却した。同時に
処理した同材質の15×35×3tのテストピースを用いて印
刷機用インキ中で各々20℃、80℃にて100時間の浸漬耐
食試験の結果、何れも0.01mg/cm2の腐食量となり高耐食
性を示した。[Example-2] 0.5 wt% of N was newly added to the mixed powder used in Example-1.
Add H 4 Cl powder as penetrant, 150φ × 150, 130φ × 120
SUS 316 printing ink pump impeller is embedded and filled in the above-mentioned semi-hermetic container made of steel plate at the time of temperature rise of 220 cc / mi.
After raising the temperature for 7 hours while flowing H 2 gas at a flow rate of n, 25 cc /
After performing the treatment at 1100 ° C for 10 hours at a H 2 gas flow rate of min,
It cooled to normal temperature while flowing the same gas flow. Using a 15 × 35 × 3t test piece of the same material processed at the same time, the results of the immersion corrosion test in a printing press ink at 20 ° C. and 80 ° C. for 100 hours each showed a corrosion amount of 0.01 mg / cm 2 in each case. And showed high corrosion resistance.
またインペラー本体を印刷機実機のポンプに取付け12
50RPMで長時間使用したところ、８ケ月経過してもエロ
ージョンやコロージョンの発生はなかった。これに対
し、通常このインペラーはSUS 316Lのままの場合は約１
〜1.5ケ月、硬質Crメッキを施した場合は３〜４ケ月の
寿命であった。Attach the impeller body to the pump of the actual printing press.
When used at 50 RPM for a long time, no erosion or corrosion occurred even after 8 months. On the other hand, this impeller is usually about 1 in case of SUS316L.
The life was 1.5 months, and the life was 3-4 months when hard Cr plating was applied.
また、従来の硬質Crメッキと本発明の処理方法につい
150φ×150のインペラーの処理コストを比較した結
果、本発明のコストは、従来方法に比べ約1/12〜1/15と
非常に低コストにて提供できた。The conventional hard Cr plating and the processing method of the present invention
As a result of comparing the processing cost of the impeller of 150φ × 150, the cost of the present invention could be provided at a very low cost of about 1/12 to 1/15 compared with the conventional method.
〔実施例−３〕 25×20×5tのSUS 321 HTB製テストピースを充分Cr富
化処理を行った金属Cr粉75wt％、Al2O3粉24.5wt％、NH4
Cl粉0.5wt％からなる混合粉末と共にケース内全体にH2
ガスが行きわたるように配設されたH2ガス封入装置をも
つ鋼板製半密閉容器に埋設、充填し、室温から1050℃ま
での昇温時に180cc/minの流量のH2ガスを60〜90℃に加
熱した温水中に通して流しながら６時間の昇温期を経過
した後、H2ガス流量を25cc/minにおとし、1050℃にて８
時間のクロマイズ処理を行った。[Example 3] 75% by weight of a metal Cr powder, 24.5% by weight of Al 2 O 3 powder, and NH 4 , which were obtained by subjecting a 25 × 20 × 5t SUS 321 HTB test piece to a sufficient Cr enrichment treatment
H 2 is mixed with the mixed powder consisting of 0.5 wt%
Embedded steel semi-sealed container having a H 2 gas confining means disposed to span go gas, filling, H 2 gas flow rate of 180 cc / min at Atsushi Nobori up to 1050 ° C. from room temperature 60 to 90 After passing a 6-hour heating period while flowing through warm water heated to 10 ° C., the flow rate of H 2 gas was set to 25 cc / min,
A time chromizing treatment was performed.
その後、光学顕微鏡組織、EPMAによるFe,Cr,Niの成分
分析結果及びマイクロビッカース硬度測定を実施した
が、これらの結果は、実施例−１とほぼ同様であり、ま
た、JIS Z 2371に定める35℃にて336時間の塩水噴霧試
験においても腐食重量減は0.30mg/cm2と非常に小さく優
れた耐食性を示した。Thereafter, the optical microscope structure, the results of component analysis of Fe, Cr, and Ni by EPMA and the measurement of micro-Vickers hardness were performed. These results are almost the same as those in Example 1, and are the same as those described in JIS Z 2371. In the salt spray test at 336 ° C for 336 hours, the corrosion weight loss was very small, 0.30 mg / cm 2 , indicating excellent corrosion resistance.
本発明の処理方法によれば、オーステナイト系ステン
レス鋼表面にσ相を有する組織のクロム拡散層を形成さ
せることにより耐摩耗性、耐食性の優れた、しかも従来
方法に比べ1/12〜1/15の低コストの表面回質処理剤を提
供できる。According to the treatment method of the present invention, by forming a chromium diffusion layer having a structure having a σ phase on the surface of austenitic stainless steel, abrasion resistance, excellent corrosion resistance, and 1/12 to 1/15 compared with the conventional method. Low cost surface regenerating agent can be provided.
第１図はFe−Cr−Ni系三元状態図、第２図は本発明の実
施例により得られたSUS 304材断面の金属組織を示す光
学顕微鏡写真（300倍）、第３図は本発明の実施例によ
り得られたSUS 304材断面のマイクロビッカース硬度測
定結果を示す図表である。FIG. 1 is an Fe--Cr--Ni ternary phase diagram, FIG. 2 is an optical microscope photograph (300 times) showing a metal structure of a cross section of a SUS 304 material obtained according to an embodiment of the present invention, and FIG. 4 is a table showing micro Vickers hardness measurement results of a SUS 304 material cross section obtained according to an example of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐木 邦夫 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎研究所内 (72)発明者 金子 晨 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎研究所内 (72)発明者 西尾 敏明 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎研究所内 (72)発明者 西 亮 長崎県西彼杵郡時津町久留里郷字永之浦 376―10 滲透工業株式会社長崎工場内 (72)発明者 辻 豊 長崎県西彼杵郡時津町久留里郷字永之浦 376―10 滲透工業株式会社長崎工場内 (58)調査した分野(Int.Cl.6，ＤＢ名) C23C 10/40──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunio Saki, 1-1, Akunouramachi, Nagasaki, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd. Nagasaki Research Laboratory (72) Inventor, Akira Kaneko 1-1, Akunouramachi, Nagasaki, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd.Nagasaki Research Laboratory (72) Inventor Toshiaki Nishio 1-1, Akunoura-cho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd. 376-10 Noura 376-10 Inside Nagasaki Plant of Tohyo Kogyo Co., Ltd. (72) Inventor Yutaka Tsuji Naganoura 376-10 Character of Kururigo, Togitsu-cho, Nishisonogi-gun, Nagasaki Prefecture Nagasaki Plant of Tohyo Kogyo Co., Ltd. (58) Field surveyed (Int. Cl. 6 , DB name) C23C 10/40
Claims (2)
i:8〜14重量％及び数種の添加元素を含む残部Feからな
るオーステナイト系ステンレス鋼のCr拡散浸透処理する
に際し、封入する水素ガスが全体に限りなくゆきわたる
構造の鋼板製半密閉容器を用い、該容器内に上記オース
テナイト系ステンレス鋼をCr拡散浸透処理剤と共に充填
し、1000〜1150℃までの昇温過程では該Cr拡散浸透処理
剤重量1kgに対し100〜250cc/分、昇温後の保持及び冷却
過程では25〜50cc/分の割合で水素ガスを流すことによ
り、オーステナイト系ステンレス鋼の表面に高硬度、高
耐食性を有するFe−Cr−Ni系金属間化合物のσ相組織を
形成させることを特徴とするオーステナイト系ステンレ
ス鋼の表面改質処理方法。(1) C: 0.02 to 0.12% by weight, Cr: 17 to 25% by weight, N
i: When carrying out Cr diffusion and infiltration treatment of austenitic stainless steel composed of 8 to 14% by weight and the balance of Fe containing several kinds of additional elements, a semi-closed vessel made of steel sheet having a structure in which hydrogen gas to be filled is completely extended as much as possible is used. The container is filled with the austenitic stainless steel together with the Cr diffusion infiltration treatment agent, and in the temperature raising process up to 1000-1150 ° C, 100-250 cc / min per 1 kg of the Cr diffusion infiltration treatment agent weight, and after the temperature rise. In the holding and cooling process, by flowing hydrogen gas at a rate of 25 to 50 cc / min, a σ phase structure of Fe-Cr-Ni intermetallic compound having high hardness and high corrosion resistance is formed on the surface of austenitic stainless steel. A surface modification treatment method for austenitic stainless steel, comprising:
℃の温水中を通過させた後の湿った水素ガスを使用する
ことを特徴とするオーステナイト系ステンレス鋼の表面
改質処理方法。2. The method according to claim 1, wherein the heating step comprises the step of:
A method for surface-modifying austenitic stainless steel, which comprises using wet hydrogen gas after passing through hot water at ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23250490A JP2786529B2 (en) | 1990-09-04 | 1990-09-04 | Surface modification treatment method for austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23250490A JP2786529B2 (en) | 1990-09-04 | 1990-09-04 | Surface modification treatment method for austenitic stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04116152A JPH04116152A (en) | 1992-04-16 |
| JP2786529B2 true JP2786529B2 (en) | 1998-08-13 |
Family
ID=16940366
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23250490A Expired - Lifetime JP2786529B2 (en) | 1990-09-04 | 1990-09-04 | Surface modification treatment method for austenitic stainless steel |
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| Country | Link |
|---|---|
| JP (1) | JP2786529B2 (en) |
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| CN105063495B (en) | 2015-08-31 | 2017-07-04 | 北京科技大学 | A kind of preparation method of the stainless steel rebar of anti-chlorine ion corrosion |
| CN109074001A (en) * | 2016-03-31 | 2018-12-21 | 富士胶片株式会社 | Semiconductors manufacture treatment fluid, its manufacturing method, the manufacturing method of pattern forming method and electronic device |
| EP3850121A1 (en) * | 2018-09-14 | 2021-07-21 | TRD Surfaces ApS | Stainless steel object having a surface modified with chromium |
| EP3835438A1 (en) | 2019-12-13 | 2021-06-16 | The Swatch Group Research and Development Ltd | Paramagnetic hard stainless steel and method for manufacturing same |
| CN113005395A (en) * | 2019-12-20 | 2021-06-22 | 中核建中核燃料元件有限公司 | Chromizing and nitriding surface treatment process for austenitic stainless steel |
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1990
- 1990-09-04 JP JP23250490A patent/JP2786529B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH04116152A (en) | 1992-04-16 |
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