JP3456761B2 - Manufacturing method of steel parts for plating - Google Patents
Manufacturing method of steel parts for platingInfo
- Publication number
- JP3456761B2 JP3456761B2 JP16572994A JP16572994A JP3456761B2 JP 3456761 B2 JP3456761 B2 JP 3456761B2 JP 16572994 A JP16572994 A JP 16572994A JP 16572994 A JP16572994 A JP 16572994A JP 3456761 B2 JP3456761 B2 JP 3456761B2
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- steel
- manufacturing
- plating
- gas
- 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 - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鍍金処理代替用鋼部品
の製造方法に関するものであって、詳しくは公害性鍍金
あるいは表面処理を代替して無公害、低エネルギーとし
て耐食性、耐摩耗性及び疲労強度が優秀な鋼部品を製造
する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a steel part for plating treatment substitution, and more specifically, it is a pollution-free plating or surface treatment alternative to pollution-free, low energy corrosion resistance, wear resistance and The present invention relates to a method of manufacturing a steel part having excellent fatigue strength.
【０００２】[0002]
【従来の技術】このような鍍金処理代替用鋼部品の製造
方法は現在まで塩浴法とガス法が開発されてきた。まず
塩浴法は二つの連続的な溶融塩浴槽処理によって鋼部品
を熱処理することで耐食性を持つ鋼部品を製造する技術
と知られている。この場合、一番目の溶融塩浴槽は窒化
処理浴槽として、公害性青酸カリ化物、青酸カリ塩媒体
を溶かした浴槽を５８０℃と加熱した状態で鋼部品を入
れて２時間窒化処理の後、苛性ソーダ、苛性カリ及び硝
酸ソーダを溶かした４００℃の浴槽で約１０分間酸化処
理した後、部品を水中で冷却し、洗浄工程を経て処理さ
れた部品の要望表面粗度を得るためにラッピング（ｌａ
ｐｐｉｎｇ）または研磨したものを再び、４００℃に加
熱した酸化処理浴槽（二番目の塩浴槽）で２０分間再酸
化させた後、水冷して完成された耐食鋼部品を製造する
方法である。しかし、この塩浴法は毒性化学物質の使用
による環境公害の問題と共に１次塩浴が２次塩浴に混合
されることで生ずる酸化処理の不合理性及び酸化処理の
後、水洗等による廃水処理の問題が惹起され、かつ２次
酸化処理のための加熱によって、特に炭素鋼で部品の疲
労強度が減少することがもっとも、大きい欠点である。2. Description of the Related Art A salt bath method and a gas method have been developed up to now as a method for manufacturing such steel parts for plating treatment. First, the salt bath method is known as a technique for manufacturing a steel part having corrosion resistance by heat treating the steel part by two continuous molten salt bath treatments. In this case, the first molten salt bath is a nitriding bath, and the steel parts are put in a bath in which the harmful cyanide cyanide and the potassium cyanide salt medium are melted at 580 ° C. for 2 hours, followed by nitriding treatment, and then caustic soda and caustic potash. After oxidation treatment for about 10 minutes in a bath of 400 ° C. in which sodium hydroxide and sodium nitrate are melted, the component is cooled in water and subjected to a washing process to obtain a desired surface roughness of the treated component.
Pping) or polished ones again, after being re-oxidized for 20 minutes with pressurized <br/> hot oxidation treatment bath to 400 ° C. (second salt bath), to produce a corrosion resistant steel component was achieved on a water-cooled Is the way. However, this salt bath method is accompanied by the problem of environmental pollution due to the use of toxic chemical substances, and the irrationality of the oxidation treatment caused by mixing the primary salt bath with the secondary salt bath, and the waste water by washing with water after the oxidation treatment. processing problems raised, and the heating for the secondary oxidation process, in particular the most to decrease the fatigue strength of the part of carbon steel, a great disadvantage.
【０００３】ガス法は５５０℃〜７２０℃のアンモニア
−吸熱形ガスまたはアンモニア−発熱形ガス雰囲気中
で、４時間以上部品を浸窒炭化処理の後、２〜１２０秒
間酸化性雰囲気中に露出させる表面酸化熱処理（１次酸
化処理）を実施した後、水−油エマルジョン冷媒に冷却
してから脱脂した後、耐食性向上のためにワックスコー
ティング処理する方法と、かつ、１次酸化処理の後、冷
却された部品を表面粗度０．２μｍＲA以下に研磨した
後、再加熱酸化処理（２次酸化処理）の後、冷却する方
法である。このようなガス法はガス窒化処理完了の後、
人為的な１次酸化処理のために炉内に残留する元来のガ
スを窒素ガスと置換した後、再び、炉内に酸化性ガスを
別途に投入して部品の厚さによる１次酸化処理時間を厳
格に制御しなければ１μｍ以下の酸化被膜を得られない
という処理工程上の複雑性と難しさにより、特に、炉内
に装込された部品の量と表面積によって部品全体におい
て均一な酸化層を得にくく、研磨の後、２次酸化処理を
３５０〜５５０℃で実施するための再加熱によるエネル
ギーの消費、作業工程の複雑性と炭素鋼で窒化処理中に
表面側に形成された窒素固溶層で２次酸化処理時の再加
熱による窒化物即ち、Ｆｅ4Ｎの析出によって部品の疲
労強度が著しく減少することが大きい問題点として残っ
ており、特にこの方法で製造された部品は５％塩水噴霧
試験で１００〜２００時間ぐらいで発錆が容易に起こる
ことから、耐食性に優れないという欠点も持っている。[0003] Gas Law 550 ° C. to 720 ° C. Ammonia - endothermic type gas or ammonia - in heating type gas atmosphere, after窒炭process immersed for 4 hours or more parts, is exposed during 2 to 120 seconds oxidizing atmosphere A method of performing a surface oxidation heat treatment (primary oxidation treatment), cooling to a water-oil emulsion refrigerant and then degreasing, and then performing a wax coating treatment to improve corrosion resistance, and cooling after the primary oxidation treatment. This is a method of polishing the formed component to have a surface roughness of 0.2 μm RA or less, and then performing a reheating oxidation treatment (secondary oxidation treatment) and then cooling. After the gas nitriding process is completed,
After the original gas remaining in the furnace for artificial primary oxidation was replaced with nitrogen gas again, the primary oxidation treatment with a thickness of the part by introducing an oxidizing gas into the furnace separately An oxide film of 1 μm or less cannot be obtained unless the time is strictly controlled.
The complexity and difficulty of the process steps of, in particular, by Sokomi been part of the amount and surface area in the furnace rather difficulty to obtain a uniform oxide layer in the entire part after polishing, 350 secondary oxidation process 550 energy consumption by reheating for implementing at ° C., nitride by the secondary oxidation process during reheating in nitrogen solid solution layer formed on the surface side during nitriding in complexity and carbon steel working steps that is, remaining as a possible large problem that the fatigue strength of the component by precipitation of Fe 4 N is significantly reduced
In particular, the parts manufactured by this method also have a drawback that they are not excellent in corrosion resistance, because rust easily occurs in 100 to 200 hours in a 5% salt spray test.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は上述し
た従来の塩浴法とガス法が持っている問題点を最少化乃
至完全に除去するために、同一炉内ガス雰囲気中でガス
酸化−浸窒炭化処理を同時に実施することで低公害、低
エネルギーとして耐食性、耐摩耗性及び疲労強度が優秀
な鋼部品を提供しようとすることである。For purposes of the present invention 0008] is to eliminate the problems the conventional salt bath techniques described above and Gas Act have to minimize or completely, the gas in the same furnace in a gas atmosphere
An object of the present invention is to provide a steel part having low pollution, low corrosion, corrosion resistance, wear resistance, and fatigue strength by simultaneously performing oxidation-nitriding and carbonizing treatment .
【０００５】[0005]
【課題を解決するための手段】このような目的を達成す
るために本発明によると、窒化性ガスに酸化性ガスを添
加した酸化−窒化ガス雰囲気で鋼部品を熱処理して、表
面に酸化物層、酸素が含有されたε−炭窒化物層を形成
するようにした鍍金処理代替用高耐食性鋼部品の製造方
法が提供される。According to the present invention to achieve the above object, a steel part is heat-treated in an oxidizing-nitriding gas atmosphere in which an oxidizing gas is added to a nitriding gas to form an oxide on the surface. Provided is a method for producing a high corrosion resistant steel part as an alternative to a plating process, which comprises forming a layer , an ε- carbonitride layer containing oxygen.
【０００６】酸化−窒化処理雰囲気中で酸化と窒化が同
時に起る理由は、窒化性ガスに酸化性ガスを添加するこ
とで、炉内ガス反応によって生成された水蒸気と未反応
の酸素あるいは炭化水素ガスと空気の炉内直接反応によ
って形成された二酸化炭素及び一酸化炭素などの酸化性
ガスによって、表面酸化物層と酸素が含有されたε−炭
窒化物層が形成されるからである。この際ε−炭窒化物
内の酸素の浸透深さは５〜１０μｍ程である。The reason why the oxidation and the nitriding occur simultaneously in the oxidizing-nitriding treatment atmosphere is that when the oxidizing gas is added to the nitriding gas, the steam generated by the gas reaction in the furnace does not react with the steam.
Ε-carbon containing a surface oxide layer and oxygen by the oxidizing gas such as carbon dioxide and carbon monoxide formed by the direct reaction of oxygen or hydrocarbon gas with air in the furnace
This is because the nitride layer is formed. At this time, the penetration depth of oxygen in ε-carbonitride is about 5 to 10 μm.
【０００７】最表面酸化物層と酸素が含有されたε−炭
窒化物層を同時に形成するためのガス雰囲気熱処理は４
２０〜７２０℃までの温度区間で最大５０時間までアン
モニアと５〜５０％の（Ｃ 3 Ｈ 8 ＋ａｉｒ）及び窒素で構
成されたガス雰囲気で実施する。この際使用された熱処
理炉としては上下部に撹拌ファンが付着された下部ガス
注入形ピット形炉、シールドクエンチ炉、流動床炉ある
いは三つ以上のチァンバーで構成されて、各チァンバー
の上下に撹拌ファンが付着されたメッシュベルトタイプ
連続炉などであって、ここで酸化−窒化処理を起すガス
は鋼部品の表面にアンモニアが原子窒素を供給して、二
酸化炭素及び一酸化炭素が炭素を供給するし、炉内で空
気中の酸素及び空気のプロパンガスの燃焼反応によって
形成された水蒸気、二酸化炭素及び一酸化炭素が酸素を
供給する。部品の最表面の酸化物層と酸素が含有された
ε−炭窒化物層の厚さは各々０．５〜５μｍ及び１５〜
３０μｍまで形成され、これは部品の物理的な要求特性
によって処理時間、温度及びガス雰囲気の組成を除去す
ることで変化させられる。 Ε-carbon containing an outermost oxide layer and oxygen
The gas atmosphere heat treatment for simultaneously forming the nitride layer is 4
Anne up to a maximum of 50 hours at a temperature interval of up to 20~720 ℃
Pneumoniae and 5-50% of (C 3 H 8 + air), and you performed in a gas atmosphere composed of nitrogen. The heat treatment furnace used at this time consisted of a lower gas injection type pit furnace with stirring fans attached to the upper and lower parts, a shield quench furnace, a fluidized bed furnace or three or more chambers, with stirring above and below each chamber. A mesh belt type continuous furnace to which a fan is attached, where the gas that causes oxidation-nitriding treatment is that ammonia supplies atomic nitrogen to the surface of the steel part, and carbon dioxide and carbon monoxide supply carbon. Then, steam, carbon dioxide and carbon monoxide formed by the combustion reaction of oxygen in the air and propane gas of the air supply oxygen in the furnace. The thickness of the oxide layer and the oxygen of the outermost surface of the component is contained ε- carbonitride layer each 0.5~5μm and 15
It is formed up to 30 μm, which can be varied by removing the processing time, temperature and composition of the gas atmosphere depending on the physical requirements of the part.
【０００８】特に酸化−窒化複合同時処理の後、表面研
磨をした状態で０．２μｍＲA以下の表面粗度を要求す
る部品に対して表面酸化物層の厚さは０．５〜５μｍま
で形成され、かつ酸素が含有されたε−炭窒化物層の厚
さは１５〜３０μｍまで形成して、この際、酸素が含有
されたε−炭窒化物層の厚さの１／３〜１／２は気孔層
で構成され、この気孔に酸化物が形成されて表面耐食性
が向上される。代表的にこのような酸素が含有されたε
−炭窒化物層の厚さは大凡２０μｍ程が適当であって、
この厚さは５７０℃で２時間あるいは６００℃で１時間
２０分間熱処理することで形成される。しかし、これよ
り更に薄いか厚い、酸素が含有されたε−炭窒化物層は
処理時間及び温度と使用されたガス雰囲気の組成によっ
て変化される。表面酸化物層の厚さは酸化−窒化熱処理
ガスの組成によって変化され、かつ熱処理温度と時間も
やはり変数になる。たとえば、５０％ＮＨ3−２０％
（Ｃ3Ｈ8＋４ａｉｒ）−３０％Ｎ2ガス雰囲気中で５７
０℃で２時間酸化−窒化熱処理時、表面酸化物層は大凡
４μｍ厚さを持つ。この際、酸素が含有されたε−炭窒
化物層は２２μｍとなり、酸素が含有されたε−炭窒化
物層の気孔層の厚さは大凡１０μｍ程と形成される。Particularly, after the simultaneous oxidation-nitridation combined treatment, the surface oxide layer is formed to a thickness of 0.5 to 5 μm for a part requiring a surface roughness of 0.2 μm RA or less in the state where the surface is polished. thick is, and oxygen is contained ε- carbonitride layer
Is is formed to 15 to 30 [mu] m, this time, 1 / 3-1 / 2 of the thickness of the oxygen is contained ε- carbonitride layer is composed of pores layers, oxide the pore formation As a result, the surface corrosion resistance is improved. Typically, such oxygen-containing ε
- The thickness of the carbonitride layer is a more approximate 20μm is appropriate,
This thickness is Ru is formed by heat treatment for 1 hour 20 minutes at 2 hours or 600 ° C. at 570 ° C.. However, thinner or thicker than this, oxygen ε- carbonitride layer containing the Ru is varied by the composition of the gas atmosphere used and the treatment time and temperature. Thickness oxidation of the surface oxide layer - is varied with composition in the nitriding heat treatment gas, and the heat treatment temperature and time also becomes too variable. For example, 50% NH 3 -20%
(C 3 H 8 + 4air) -30% in N 2 gas atmosphere 57
2 hours oxide at 0 ° C. - nitriding heat treatment, the surface oxide layer is one lifting the approximate 4μm thickness. In this case, oxygen is contained ε- carbonitride nitride <br/> oxide layer becomes 22 .mu.m, the thickness of the pore layer of oxygen is contained ε- carbonitride layer is as a form roughly 10 [mu] m.
【０００９】１μｍ以下の酸化物層の厚さはブレーキマ
スターバッグ、ねじと同じ低炭素鋼及び低炭素合金鋼の
耐食性を向上するのに非常によく適合し、特に薄い鋼板
（３ｍｍ以下）で成形製造された部品の場合、表面酸化
物層が２μｍ以上の場合剥離が起るから、これを防止す
るために、表面酸化物層の厚さが１．５μｍ以下になる
ようにガス雰囲気を調節しなければならない。The oxide layer thickness of less than 1 μm is very well suited to improve the corrosion resistance of low carbon steels and low carbon alloy steels similar to brake master bags, screws, especially formed by thin steel plates (3mm or less). In the case of manufactured parts, peeling occurs when the surface oxide layer is 2 μm or more. To prevent this, the gas atmosphere is adjusted so that the thickness of the surface oxide layer is 1.5 μm or less. There must be.
【００１０】部品がある表面粗度を要求する場合におい
て、酸化−窒化処理の後、熱処理油あるいは水溶性冷却
剤で直接冷却する。たとえば、自動車用ショックアブソ
ーバ用ロド、各種油．空圧ピストンロド、ダンパーロド
等のように硬質クロム鍍金あるいは高周波熱処理の後、
硬質クロム鍍金を実施する部品の場合は、ガス酸化−窒
化雰囲気で熱処理の後、熱処理油あるいは水溶性冷却剤
で直接冷却した後、部品に要求される表面粗度を得るた
めに表面研磨を実施する。この際、表面研磨は表面粗度
０．１５μｍＲA以下に実施することが良く、研磨の
時、酸化−窒化処理された部品の最表面の酸化物層が除
去される。このように研磨された上記部品は、高い疲労
強度を持ち、以後の付加的な酸化処理をしなくても、塩
水噴霧試験で３００時間以上発錆なく耐える。When a part requires a certain surface roughness, a heat treatment oil or water-soluble cooling is applied after the oxidation-nitriding treatment.
Cool directly with the agent . For example, rods for shock absorbers for automobiles, various oils. After hard chrome plating or high frequency heat treatment such as pneumatic piston rod, damper rod, etc.,
In the case of parts that are hard chrome plated, after heat treatment in a gas oxidation-nitriding atmosphere, heat treated oil or water-soluble coolant
After being directly cooled in, the surface is polished to obtain the surface roughness required for the part. At this time, the surface polishing rather goodness be carried below the surface roughness 0.15MyumR A, when polishing, oxide - oxide layer of the nitrided treated part of the outermost surface is removed. Polished the component in this way, high fatigue strength Chi the lifting, without subsequent additional oxidation withstand without rusting over 300 hours in the salt spray test.
【００１１】この方法によって製造された自動車用ショ
ックアブソーバ用ロド、各種油・空圧ピストンロド及び
ダンパーロド等はまるで、クロム鍍金処理をしたものの
ような表面鏡面光沢を出し、高周波熱処理とクロム鍍金
を並行実施する部品の機械的な性質を凌駕すると評価さ
れる。特に硬質クロム鍍金処理の場合、鍍金層を３０μ
ｍと処理した時、塩水噴霧試験で７２〜９６時間で発錆
をするとの事実と比較する時、３倍以上の耐食性が保障
され、部品表面層の窒素固溶層を再加熱なく維持するか
ら、同一部品に対して従来の塩浴法とガス法によって製
造されたものと比較する時、付加的な再加熱操作とか熱
的酸化操作を必要としないで、処理工程が大幅に簡単
で、高い耐食性及び疲労強度を確保できる方法である。[0011] Rod shock absorber for automobiles produced by this method, various oil-pneumatic Pisutonrodo and Danparodo etc. like, and exits the surface specular gloss such as those in which the chromium plating process, parallel induction heat treatment and chromium plating It is estimated to exceed the mechanical properties of the parts to be implemented. Especially in the case of hard chrome plating, the plating layer is 30μ
when treated with m, when compared with the fact that rusting in 72-96 hours salt spray test, more than three times the corrosion resistance is guaranteed <br/>, nitrogen solid solution layer of the part surface layer again Since it is maintained without heating, when compared to those manufactured by the conventional salt bath method and gas method for the same part, no additional reheating operation or thermal oxidation operation is required, and the treatment process is significantly increased. It is a simple method that can ensure high corrosion resistance and fatigue strength.
【００１２】[0012]
【実施例】（実施例１）
ショックアブソーバ用ロドは長さ３４ｃｍ，直径１８ｍ
ｍ，初期表面粗度０．２〜０．４μｍＲAと加工・研磨
を実施したＳ４５Ｃと４５Ｃに該当する非粗質鋼を５８
０℃で２時間ぐらい５０％ＮＨ3−３０％（Ｃ3Ｈ8＋４
ａｉｒ）−２０％Ｎ2ガス雰囲気で酸化−窒化処理の
後、水溶性冷却剤に冷却した。この際、表面に形成され
た酸化物は双方の素材に対して同一で大凡２．２μｍ、
ε−炭窒化物層の厚さは２５μｍ、気孔層の厚さは約１
２μｍであった。このロドらを０．１１μｍＲAと研磨
した状態で塩水噴霧試験の結果、両者共に、３００時間
以上発錆なく存し、かつ、更に高い耐食性と表面潤滑性
及び美的効果を付与するために０．１１μｍＲAと最終
研磨状態のロドを１００℃と予熱した後、１２５℃で加
熱攪拌される海水１リットルに１２モル苛性ソーダと１
００ｇの硝酸ソーダを溶かした溶液に５分間浸けてから
流れる水で洗浄した後、乾燥してから塩水噴霧試験した
結果、両者の材質は、全部４００時間以上発錆なく耐え
た。このように処理されたロド（Ｓ４５Ｃ）を油圧式及
びガス式ショックアブソーバで組立た後、往復圧縮試験
の結果、６００万サイクルにおいて、何の問題点も発見
されなかった。これは現在製造されている同種の硬質ク
ロム鍍金処理の割に３倍以上の耐久性があった。Example 1 A shock absorber rod has a length of 34 cm and a diameter of 18 m.
m, an initial surface roughness of 0.2 to 0.4 μm RA, and processed and polished S45C and non-rough steel corresponding to 45C
50% NH 3 -30% (C 3 H 8 +4
air) After oxidation-nitridation treatment in a 20% N 2 gas atmosphere, it was cooled to a water-soluble coolant. At this time, the oxide formed on the surface is the same for both materials and is approximately 2.2 μm,
The thickness of the ε-carbonitride layer is 25 μm, and the thickness of the pore layer is about 1
It was 2 μm. 0 The Rod et results of salt spray test while polishing the 0.11MyumR A, Both, or 300 hours rusting without to exist, and, in order to impart higher corrosion resistance and surface lubricity and aesthetic effect. After pre-heating the rod having a final polishing state of 11 μm RA to 100 ° C., 12 mol of caustic soda was added to 1 liter of seawater heated and stirred at 125 ° C.
After washing with water flowing from the dipped 5 minutes to a solution of sodium nitrate in 200 g, dried result of the salt spray test from both materials withstand without total 400 hours or more rust
It was After was assembled thus treated Rodos the (S45C) by the hydraulic and gas shock absorber, as a result of the reciprocating compression test, Oite 600 million cycles, was not found any problem. This was more than three times as durable as the current hard chrome plating treatment of the same type.
【００１３】（実施例２）
クエンチング．テンペリング（ｑｕｅｎｃｈｉｎｇ−ｔ
ｅｍｐｅｒｉｎｇ）した窒化鋼（ＳＡＣＭ １種）で機
械加工した紡織用及び機械用スピンドル部品を０．４μ
ｍＲA程と研磨した後、下部ガス注入形ピット炉で５８
０℃で３０時間ぐらい５０％ＮＨ3−３０％（Ｃ3Ｈ8＋
４ａｉｒ）−２０％Ｎ2ガス雰囲気で浸窒炭化処理の
後、水溶性冷却剤に冷却した後、０．２μｍＲAの粗度
を持つように研磨した状態で塩水噴霧試験した結果、２
００時間以上発錆せず、実際の疲労強度も３倍以上向上
された。(Example 2 ) Quenching. Tempering (quenching-t
0.4μ for spinning and mechanical spindle parts machined from embossed nitrided steel (SACM type 1)
After polishing the as mR A, 58 at the bottom gas injection type pit furnace
50% NH 3 -30% (C 3 H 8 +
4Air) After窒炭process immersed in -20% N 2 gas atmosphere and cooled in a water-soluble coolant, as a result of the salt spray test while polished to have a roughness of 0.2μmR A, 2
00 hours or more without rusting, was actually of fatigue strength more than three times improvement.
【００１４】[0014]
【発明の効果】本発明はガスを使用するから塩浴法と関
係された公害問題を一掃して、かつ現存するガス法の割
に窒化処理の後に付加的に実施する人為的な酸化熱処理
を必要にしないで、再加熱によるエネルギー節減、作業
工程の単純化及び高い疲労強度を持つ部品の製造におい
て利点を持つ。The present invention eliminates the pollution problem associated with the salt bath method because a gas is used, and an artificial oxidation heat treatment is additionally performed after the nitriding treatment in comparison with the existing gas method. It is not necessary but has advantages in energy saving by reheating, simplification of working process and production of parts with high fatigue strength.
【００１５】本発明で酸化−窒化熱処理は厳格に言えば
同一炉内で酸化と窒化が同時に起こることを意味する
し、この際、窒化は浸窒炭化処理と広義の意味で同一で
ある。従って、浸窒炭化は鋼中に窒素と炭素を同時に拡
散浸透させる熱化学的処理法として本発明で窒化は浸窒
炭化を含む広義の意味で使用している。従って、本発明
では、酸化−浸窒炭化処理は唯、使用ガスの組成中空気
とプロパンの混合気体及び窒素ガスを添加する場合浸窒
炭化処理がされる。[0015] The present invention in oxide - to oxidation and nitriding in the same furnace speaking nitriding heat treatment is strictly means that simultaneous, this time, nitride are identical at窒炭process and broad sense immersion. Therefore, immersion窒炭reduction is used in the broadest sense to include the present invention in the immersion窒炭of nitride as thermochemical treatment method for simultaneously cementation nitrogen and carbon in the steel. Accordingly, in the present invention, oxide - immersion窒炭treatment is only are the窒炭process immersion when adding mixed gas and nitrogen gas composition in the air and propane gas used.
【００１６】本発明によって鋼部品の耐食性の向上は酸
化窒化同時処理によって鋼部品の表面に付着された表面
酸化物層と酸素が含有されたε−炭窒化物層中の気孔内
の酸化物形成及び表面ε−炭窒化物自体が高い耐食性を
持つ。これら酸化物層は主にＦｅ3Ｏ4、Ｆｅ2Ｏ3で構成
されるし、表面ε−炭窒化物層は主にＦｅ3（ＣＮ）で
構成される。The improvement in the corrosion resistance of the steel part by the present invention is formed oxide in the pores of ε- carbonitride layer adhesion surface oxide layer and the oxygen on the surface of the steel component is contained by oxynitride concurrency and surface ε- carbonitride itself has high corrosion resistance. These oxide layers is comprised of mainly Fe 3 O 4, Fe 2 O 3, the surface ε- carbonitride layer is mainly constituted by Fe 3 (CN).
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−52054（ＪＰ，Ａ) 特開 昭58−52474（ＪＰ，Ａ) 特開 昭55−128577（ＪＰ，Ａ) 特開 昭51−70136（ＪＰ，Ａ) 特開 昭61−30660（ＪＰ，Ａ) 特開 昭57−79168（ＪＰ，Ａ) 特公 昭49−30339（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 8/28 C21D 1/76 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A 64-52054 (JP, A) JP-A 58-52474 (JP, A) JP-A 55-128577 (JP, A) JP-A 51- 70136 (JP, A) JP-A 61-30660 (JP, A) JP-A 57-79168 (JP, A) JP-B 49-30339 (JP, B1) (58) Fields investigated (Int.Cl. 7 , DB name) C23C 8/28 C21D 1/76
Claims (10)
及びプロパンガスを直接炉内に投入して、鋼部品を酸化
−浸窒炭化処理を同時に行い、表面に酸化物層、酸素が
含有されたε−炭窒化物層を形成するようにして、それ
を表面仕上げ処理することを特徴とする鍍金処理代替用
鋼部品の製造方法。1. Ammonia gas which is a nitriding gas and air
And propane gas directly into the furnace to oxidize steel parts
-Substitution of plating treatment characterized by performing nitriding and carburizing treatment simultaneously to form an oxide layer and an ε-carbonitride layer containing oxygen on the surface, and finishing the surface .
Manufacturing method of steel parts .
少量のＦｅ2Ｏ3であることを特徴とする請求項１に記載
の鍍金処理代替用鋼部品の製造方法。The main component of claim 2 wherein said oxide layer, according to claim 1, characterized in that the Fe 3 O 4 and a small amount of Fe 2 O 3
For manufacturing alternative steel parts for plating treatment .
形成することを特徴とする請求項１または２に記載の鍍
金処理代替用鋼部品の製造方法。3. The plating according to claim 1, wherein the oxide layer is formed to have a thickness of 0.5 to 5 μm.
Method for manufacturing steel parts for gold processing alternatives .
厚さを１５〜３０μｍに形成することを特徴とする請求
項１に記載の鍍金処理代替用鋼部品の製造方法。 4. The thickness of the ε-carbonitride layer containing oxygen is formed to be 15 to 30 μm.
Item 1. A method for manufacturing a steel component for plating treatment substitution according to Item 1.
３〜１５μｍの気孔層を含むことを特徴とする請求項１
に記載の鍍金処理代替用鋼部品の製造方法。Wherein said oxygen ε- carbonitride is contained layer is characterized in that it comprises a pore layer of 3~15μm claim 1
A method for manufacturing a steel part for plating treatment as described in .
直接熱処理油あるいは水溶性冷却オイルで冷却すること
を特徴とする請求項１に記載の鍍金処理代替用鋼部品の
製造方法。 Wherein said oxidation - after immersion窒炭treatment, cooling the steel parts directly heat treatment oil or a water-soluble cooling oil
The steel component for plating treatment substitution according to claim 1, characterized in that
Production method.
以下の表面粗度を得るために研磨する工程であることを
特徴とする請求項１に記載の鍍金処理代替用鋼部品の製
造方法。7. The surface finishing treatment is 0.2 μm R A
That the step of polishing in order to obtain the following surface roughness
A steel part for plating treatment substitution according to claim 1, characterized in that
Build method .
理あるいは有機物被覆処理を実施せず、白色光沢を持つ
耐食鋼を製造することを特徴とする請求項７に記載の鍍
金処理代替用鋼部品の製造方法。 8. The plating according to claim 7, wherein after the surface finishing treatment, no additional oxidation treatment or organic substance coating treatment is carried out to produce a corrosion resistant steel having a white luster.
Method for manufacturing steel parts for gold processing alternatives.
μｍＲA以下に研磨した後、３５０〜６００℃に維持さ
れた酸化性ガス雰囲気で酸化被膜処理することを特徴と
する請求項７に記載の鍍金処理代替用鋼部品の製造方
法。 9. A surface roughness of 0.2 by said surface finishing treatment.
After polishing below μmR A, and characterized in that the oxide film treated with oxidation gas atmosphere maintained at 350 to 600 ° C.
A method for manufacturing a steel part for plating treatment alternative according to claim 7.
Law.
拌ファンが付着された下部ガス注入式ピット形炉、流動
床炉あるいはシールドクエンチ（ｓｅａｌｅｄ ｑｕｅ
ｎｃｈ）炉で実施することを特徴とする請求項１に記載
の鍍金処理代替用鋼部品の製造方法。 Wherein said immersion窒炭of - oxidation treatment, adhesion stirred fan vertically has been lower gas-injected pit Katachiro, fluidized bed furnace or a shield quenched (sealed que
according to claim 1, which comprises carrying out in nch) furnace
For manufacturing alternative steel parts for plating treatment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930010873A KR950010239B1 (en) | 1993-06-15 | 1993-06-15 | Method for producing steel articles to substitute a plating treatment |
| KR1993/10873 | 1993-06-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07166322A JPH07166322A (en) | 1995-06-27 |
| JP3456761B2 true JP3456761B2 (en) | 2003-10-14 |
Family
ID=19357419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16572994A Expired - Fee Related JP3456761B2 (en) | 1993-06-15 | 1994-06-14 | Manufacturing method of steel parts for plating |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3456761B2 (en) |
| KR (1) | KR950010239B1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100503497B1 (en) * | 2002-11-25 | 2005-07-26 | 한국기계연구원 | Heat treating method for improving the wear-resistance and corrosion-resistance of chromium platings |
| KR100761903B1 (en) * | 2006-05-01 | 2007-09-28 | 김영희 | Method for manufacturing high corrosion-resistant color steel materials |
| KR100899578B1 (en) * | 2007-10-01 | 2009-05-27 | 한국생산기술연구원 | Method for surface hardening by high temperature nitriding in vacuum |
| DE102008023158A1 (en) | 2008-05-09 | 2009-11-12 | Schaeffler Kg | Roller bearing component e.g. roller bearing ring, for double-row ball joint bearing, has corrosion-reducing edge layer containing selectively inserted zirconium atoms, and ferritic, pearlitic or martensitic steel utilized as base material |
| JP2011201475A (en) * | 2010-03-26 | 2011-10-13 | Dong-A Univ Research Foundation For Industry-Academy Cooperation | Method of manufacturing high-strength and lightweight headrest stay |
| KR102372202B1 (en) | 2015-07-31 | 2022-03-10 | 주식회사 지에스엠 | The manufacturing method of the plating treatment for substitution steel product |
-
1993
- 1993-06-15 KR KR1019930010873A patent/KR950010239B1/en not_active IP Right Cessation
-
1994
- 1994-06-14 JP JP16572994A patent/JP3456761B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR950000917A (en) | 1995-01-03 |
| KR950010239B1 (en) | 1995-09-12 |
| JPH07166322A (en) | 1995-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0122762B1 (en) | Corrosion resistant steel components and method of manufacture thereof | |
| CN100497746C (en) | High-carbon steel pin roll vanadizing composite treatment process | |
| JP7082944B2 (en) | Chrome-based coatings, how to produce chrome-based coatings and coated objects | |
| Funatani | Low-temperature salt bath nitriding of steels | |
| JP2017508879A (en) | Method for producing chromium coating and coated object | |
| JP3456761B2 (en) | Manufacturing method of steel parts for plating | |
| CN1891847A (en) | Corrugated roller surface reinforcement modifying method and manufacturing process | |
| US5228929A (en) | Thermochemical treatment of machinery components for improved corrosion resistance | |
| JPS5923869A (en) | Heat treatment on structural member surface | |
| KR20000059685A (en) | Method for oxy-nitro caburixing the steel product for better improving the corrosion - and abrasion - resistanc | |
| US1092925A (en) | Hardening or treatment of steel, iron, &c. | |
| CN1330167A (en) | Powder zincification process of metal and its product | |
| JPH0146586B2 (en) | ||
| KR100240042B1 (en) | High temperature nitro-carbonizing treatment of metal | |
| JP2911325B2 (en) | Surface treatment method for steel | |
| GB2328953A (en) | A process for hardening high alloy steels | |
| Kunst | Improving corrosion and wear resistance by salt bath nitrocarburizing plus oxidizing in automated facilities | |
| US1937629A (en) | Black finishing metal articles | |
| JP7178832B2 (en) | Method for manufacturing surface hardening material | |
| KR101119498B1 (en) | Method for Manufacturing High Corrosion Resistant Steel Materials and Components | |
| WO2002053793A1 (en) | Duplex process of diffusion forming of hard carbide layers on metallic materials | |
| CN118241149A (en) | 42CrMo alloy surface nitriding method | |
| Berns et al. | Materials for surface layer treatments | |
| FUNATANI | The Heat Treating Global Challenge Heat Treatment Technology Today and for Future | |
| KR20030053153A (en) | Method for manufacturing hot rolled steel sheet with good fatigue resistance and corrosion resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20030623 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080801 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090801 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100801 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110801 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120801 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130801 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |