JPS60215756A - Hardening of stainless steel - Google Patents
Hardening of stainless steelInfo
- Publication number
- JPS60215756A JPS60215756A JP420785A JP420785A JPS60215756A JP S60215756 A JPS60215756 A JP S60215756A JP 420785 A JP420785 A JP 420785A JP 420785 A JP420785 A JP 420785A JP S60215756 A JPS60215756 A JP S60215756A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- weight
- hardening
- acid
- nitrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C23C8/02—Pretreatment of the material to be coated
-
- 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
- C23C8/08—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 only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は窒化処理（ｎｉｔｒｉｄｉｎｇ）、浸炭窒化処
理（ｃａｒｂｏｎｉｔｒｉｄｉｎｇ）、硝化浸炭処理（
ｎｉｔｒｏｃａｒｂｕｒｉｚｉｎｇ）およびその類似処
理工程を含むステンレス鋼を硬化する方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to nitriding, carbonitriding, nitrification carburizing (
nitrocarburizing) and similar processing steps.
従来の技術
工具およびダイス、切断工具、鋳物、機械加工した部品
鍛造物およびその類似物などの金属加工片を、該加工片
の化学的組成を一部変更し、その物理的特性を改良する
だめに窒素を含む熱的に調整された雰囲気に晒すことを
含む種々の金属処理方法はよく知られておシ、そのよう
な方法の例証では窒化処理、浸炭窒化処理および硝化浸
炭処理包含するものである。Metal workpieces, such as conventional technology tools and dies, cutting tools, castings, machined parts forgings and the like, can be processed by modifying the chemical composition of the workpiece and improving its physical properties. Various metal processing methods are well known that involve exposure to a thermally conditioned atmosphere containing nitrogen, and examples of such methods include nitriding, carbonitriding, and nitrification-carburizing. be.
窒化処理方法は代表的には適当な炉内に活性窒素を含む
加熱されたアンモニアに導かれた雰囲気に第１鉄金属加
工片を晒すことを含む。通常粗製アンモニアから導かれ
た活性窒素は炉の中で熱的に分解され、錯窒化物を含む
窒素の豊富な表面層を形成する加工片表面に拡散する。The nitriding process typically involves exposing the ferrous metal workpiece to a heated ammonia-containing atmosphere containing activated nitrogen in a suitable furnace. Activated nitrogen, usually derived from crude ammonia, is thermally decomposed in the furnace and diffused onto the workpiece surface forming a nitrogen-rich surface layer containing complex nitrides.
米国特許第４．２３６，９４２号を参照されたい。See US Pat. No. 4,236,942.
浸炭窒化処理および硝化浸炭処理は一般に炉の雰囲気も
また窒素に加えて加工片に拡散する活性炭素を含むもの
であること以外は窒化処理に類似するアンモニアに由来
する雰囲気を含んでいる。Carbonitriding and nitriding carburizing generally involve an ammonia-derived atmosphere similar to nitriding, except that the furnace atmosphere also includes activated carbon that diffuses into the workpiece in addition to nitrogen.
米国特許第３，６６３，３１５号を参照されたい。See US Pat. No. 3,663,315.
窒化され、浸炭窒化され、そして硝化浸炭された加工片
はよυ犬なる硬度および増強された耐用性、腐食性およ
び金属切断工具、機械部品鰺よび類似物の生産でこれら
の方法を有用にする疲労抵抗性を含む改善された性質を
有する
長年に亘って、窒化、浸炭窒化および硝化浸炭及び種々
な方法が浸炭処理のような一層高温度硬化技術に代替さ
れて来た。この理由はこれらの方法が余りエネルギーを
必要とせず、また処理された加工品のゆがみが少ないた
めである。塩浴及びビット炉で従来のやり方でステンレ
ス鋼加工片にこれらの処理を行うことは困難であシ時間
を浪費し、また活性化關素による均等な表面浸透を達成
するのに必要なステンレス鋼加工片表面の化学的予備調
整、すなわち表面活性化のだめの必要条件を満さなけれ
ばならないために複雑化していることが判った。化学的
予備調整は次の工程段階を妨げる薬品等を除くために加
工片を洗うことが必要であった。Nitrided, carbonitrided, and nitrided carburized workpieces have better hardness and enhanced durability, making these methods useful in the production of corrosive and metal cutting tools, machine parts, and the like. Over the years, higher temperature hardening techniques such as nitriding, carbonitriding and nitrification carburizing and various methods have been replaced by carburizing processes with improved properties including fatigue resistance. This is because these methods require less energy and produce less distortion of the processed workpiece. Performing these treatments on stainless steel workpieces in the traditional manner in salt baths and bit furnaces is difficult and time consuming and also reduces the amount of stainless steel needed to achieve uniform surface penetration by activated salts. It has been found that the chemical preconditioning of the workpiece surface is complicated by the requirement to meet the requirements for surface activation. Chemical preconditioning required washing the work piece to remove chemicals etc. that would interfere with the next process step.
発明が解決しようとする問題点
本発明は従来の欠点を解決するもので、本発明に於て、
ステンレス鋼およびその他の合金鋼類は金属加工片表面
を活性化すＺことによって流動床炉内で低温で硬化、例
えば窒化、浸炭窒化又は硝化浸炭処理できるものであシ
、この金属表面の活性化処理は、該金属加工片を酸性浴
中で浸食作用を行い活性化し、そして、該表面から酸を
除去するために水中または他の適宜な材料中で中間の注
ぎをするか、あるいはしないで、該活性化した加工片を
流動床ガスまたはガス類が少なくともいくらかの活性窒
素を含有する金属処理雰囲気を持った流動床に導入する
ものである。活性炭素源がアンモニアであり、床媒体が
酸化アルミニウムであることが下記に述べる理由によっ
て好ましい。活性窒素はなんらかの形で加工片表面に拡
散しうる窒素を意味する。Problems to be Solved by the Invention The present invention solves the conventional drawbacks.
Stainless steel and other alloy steels can be hardened at low temperatures in a fluidized bed furnace by activating the surface of the metal workpiece, such as nitriding, carbonitriding or nitrification carburizing. The metal workpiece is activated by an erosive action in an acid bath, and then the metal workpiece is heated with or without intermediate pouring in water or other suitable material to remove the acid from the surface. The activated workpiece is introduced into a fluidized bed with a metal processing atmosphere in which the fluidized bed gas or gases contain at least some activated nitrogen. It is preferred that the activated carbon source is ammonia and the bed medium is aluminum oxide for reasons discussed below. Active nitrogen refers to nitrogen that can diffuse to the workpiece surface in some way.
部品は高温流動床に導入する前は乾燥する必要がない。The parts do not need to be dried before being introduced into the hot fluidized bed.
これは部品表面に付着している液体は殆んど瞬間的に蒸
発して流動床処理または処理過程での妨げとならないか
らである。This is because the liquid adhering to the surface of the component evaporates almost instantaneously and does not interfere with the fluidized bed treatment or treatment process.
発明の構成
第１図は本発明の一実施例による流動床の断面図である
。Structure of the Invention FIG. 1 is a sectional view of a fluidized bed according to an embodiment of the invention.
第１図に示された流動床型金属処理炉１０は、好ましく
はセラミック繊維または類似物の厚い絶縁物１４を施し
た望ましくは鋼の硬い本体１２を備え、該本体は垂直加
熱容器（レトルト）１５、すなわち炉内の処理帯域と熱
的に連繋しているヒーター要素即ちバーナー１６を包囲
する。レトルト１５の上端は通気口２０または類似物を
備えた着脱自在な絶縁カバー１８により密封可能となっ
ており、それはレトルト１５からガスを脱出させるもの
であり、ノ臂イロットバーナー１９も可燃性の流動床ガ
ス排気を燃焼するために取り付ける。The fluidized bed metal processing furnace 10 illustrated in FIG. 15, enclosing a heater element or burner 16 which is in thermal communication with the processing zone within the furnace. The upper end of the retort 15 can be sealed by a removable insulating cover 18 with a vent 20 or the like to allow gases to escape from the retort 15, and the armpit burner 19 is also sealed against flammable fluids. Installed for burning floor gas exhaust.
流動ガスを再循環する流動ガスシステム（図示せず）も
ガスの使用を経済的にするため装着される。A fluidizing gas system (not shown) for recirculating the fluidizing gas is also installed to make gas usage economical.
部材２２は処理作蝉のだめカバー１８を開閉して加工片
支持かと２４の挿入および除去を容易にする。ガスを排
出し、上記カバーを開閉し、排出されたガスに混合して
いる固体物質を該ガスから除去するだめの従来と同様な
種々の方法及び装置を用いることができる。レトルト１
５の下端はガスを透過しつる分配装置パネル２６により
仕切られておりそれを通じて流動および（または）処理
ガス１ｄレトルト１５に入り、そこにある粒状の床媒体
３０、たとえば８０メツシユまたは１２０メツシユの酸
化アルミニウム粒子または他の小店性固体材料をガス内
に浮遊させ、毎分約３．０４８〜６．０９６メートル（
１０〜２ｏフイート）またはそれ以上の速度で垂直に移
動させる。浮遊している床媒体はその後「一定の形はな
いが−っになった比較的大きい膨張したかたまり」即ち
膨張体として引用する液体のような行動をとる。流動処
理ガスは分配装置・々ネル２６を通ってレトルト１５に
入る前に充満部２８に入る。ガスは管路３２により供給
される充満部人口２９を通って充満部２８に入る。清浄
ガス及び処理ガス類は分配装置ｉＲパネル６を通ってレ
トルト１５に入る前に充満部２８に入る。ガスは管路３
２により供給される充満部人口２９を経て充満部２８に
入る。清浄ガス及び処理ガス類は夫々供給管路３７及び
３６により管路３２に供給される。フローノやネル６０
は単に如何なるガスが管路３２に供給されるのかを選択
し、各々の流量を調節するための装置である。フローパ
ネル６０は代表的にはこの技術分野で周知のように一組
の可変パルプ及び流速計を備える、数個の配管構成は上
記と同一の目的を達成し、種々の追加の管路、弁などは
特別に企画された方法によシ追加または除去できる。さ
らに装置を通じて設けられた絶縁体は熱を保持し、望ま
しからぬガスの凝結を防止し、かつ絶縁体はいかなる周
知の方法によシ所望の通りに設けてもよい。The member 22 opens and closes the processing cicada sump cover 18 to facilitate insertion and removal of the workpiece support collar 24. Various conventional methods and apparatus can be used for venting the gas, opening and closing the cover, and removing from the gas any solid matter mixed with the vented gas. Retort 1
The lower end of 5 is separated by a gas-permeable distributor panel 26 through which the flow and/or process gases 1d enter the retort 15 and therein the oxidation of the granular bed media 30, e.g. 80 mesh or 120 mesh. Aluminum particles or other small solid materials are suspended in the gas at a rate of about 3.048 to 6.096 meters per minute (
vertically at a speed of 10-20 feet) or faster. The suspended bed media then behaves like a liquid, referred to as a "relatively large expanded mass of irregular shape" or expanded body. The fluidized process gas enters the fill section 28 before entering the retort 15 through the distributor channel 26. Gas enters the plenum 28 through the plenum 29 supplied by line 32. Clean gas and process gases enter the fill section 28 before entering the retort 15 through the distributor iR panel 6. Gas is pipe 3
It enters the plenum 28 via the plenum 29 supplied by 2. Clean gas and process gases are supplied to line 32 by supply lines 37 and 36, respectively. Flowno and Nell 60
is simply a device for selecting what kind of gas is supplied to the pipe line 32 and adjusting the respective flow rates. The flow panel 60 typically includes a set of variable pulp and flow meters as is well known in the art, several piping configurations accomplishing the same purpose as described above, and various additional piping, valves, etc. etc. can be added or removed using specially designed methods. Additionally, insulation provided throughout the device retains heat and prevents undesired gas condensation, and the insulation may be provided as desired by any known method.
本発明による加工の実施例の代表的な例は摩滅耐用強度
のある浅い箱を作るためにステンレス鋼の機械加工部品
を硝化浸炭することである。部品び１係またｊｄそれ以
下の塩酸中に約１時間浸漬して表面活性化する。次にそ
れらを水で濯ぎ、加工片支持装置２４中に置き、次に該
装置をレトルト１５に導入し、その開法は乾燥窒素で流
動化しヒーター１６で加熱する。次にカバー１８を閉じ
る。A representative example of a processing embodiment according to the present invention is the nitrification carburization of stainless steel machined parts to create wear-resistant shallow boxes. The parts are surface activated by immersing them in hydrochloric acid of grade 1 or below for about 1 hour. They are then rinsed with water and placed in a workpiece support device 24, which is then introduced into a retort 15, the opening of which is fluidized with dry nitrogen and heated with a heater 16. Next, cover 18 is closed.
乾燥窒素は充満部２８に、そして分配装置プレート２６
を通じて上方に流し続け、これにより床媒体を前記流動
膨張体に流動化し、その中に部品を収納したかごを沈め
る。一般に１０乃至６０分を要する床及び部品間の温度
平衡の間、乾燥ガスを流し続ける。活性ガス類、アンモ
ニア及び天然ガスは直ちに導入できるが、それらは一般
に窒素よりは費用が高く、それ故システムを窒素を単独
で用い処理温度に移行させるのが一層安価である。Dry nitrogen is supplied to the fill section 28 and to the distributor plate 26.
continues to flow upwardly through the fluidized expansion body, thereby fluidizing the bed media into the fluidized expansion body and submerging the cage containing the parts therein. Drying gas is continued to flow during temperature equilibration between the bed and parts, which typically takes 10 to 60 minutes. Although active gases, ammonia and natural gas, can be readily introduced, they are generally more expensive than nitrogen, so it is cheaper to bring the system to processing temperatures with nitrogen alone.
床及び部品が硝化浸炭温度にある時、硝化浸炭のだめア
ンモニア＋天然ガスを上記のようにレトルト１５に導入
する。４８２°〜６２１°Ｃ（９００〜１１５０’Ｆ’
）の代表的硝化浸炭温度はヒーター１６を調節すること
によシ達成され、フローＡ’ネル６０ンモニア＋天然ガ
スに変えて調整できる。他のガス類、例えば窒素＋デロ
ノｆン＋アンモニアなどまたはそれらの組み合せは天然
ガスに添加するかまたは天然ガスに代用して、上記のよ
うに処理方法を変える。この例では、アンモニア＋天然
ガス分配装置プレート２６を通シ十分な速度、例えば１
分間につき２．４３８４メートル乃至３．６５７６メー
トル（８乃至１２フイート）、そして更に好ましくは１
分間につき３．０’４８メートル（１０フイート）で加
熱されたレトルト１５に送り、活性化窒素と、そこから
導かれた炭素を部品の表面に拡散させて浅い硬化された
箱を形成しながら床媒体の流動化を起こさせる。この方
法の工程は３０分乃至８時間を要する。次に部品は室温
に冷却される。この方法に従って処理された部品は均等
に硬化された箱となる。When the bed and parts are at the nitrification carburization temperature, the nitrification carburization reservoir ammonia + natural gas is introduced into the retort 15 as described above. 482°~621°C (900~1150'F'
A typical nitrification carburization temperature of ) is achieved by adjusting the heater 16 and can be adjusted by changing the flow A' 60 ammonia + natural gas. Other gases, such as nitrogen + deronofon + ammonia, or combinations thereof, can be added to or substituted for natural gas to alter the process as described above. In this example, the ammonia + natural gas distributor plate 26 is pumped at a sufficient rate, e.g.
2.4384 meters to 3.6576 meters (8 to 12 feet) per minute, and more preferably 1
10 feet per minute to a heated retort 15 to diffuse activated nitrogen and carbon derived therefrom to the surface of the part to form a shallow hardened box while flooring the part. Cause fluidization of the medium. The process steps take between 30 minutes and 8 hours. The part is then cooled to room temperature. Parts processed according to this method result in uniformly hardened boxes.
下表１は本発明による数種のステンレス鋼を処理するた
めの主要なノ々ラメ−ターと、その結果を掲げる。第１
欄の鋼確認数字はアメリカン アイアン アンド スチ
ール（ＡＩＳＩ）標準でちる。すべての試料は上記の先
行技術の処理に記載された稀薄酸中で活性化されたもの
である。Table 1 below lists the main parameters and results for treating several types of stainless steel according to the present invention. 1st
Steel confirmation numbers in the column are based on American Iron and Steel (AISI) standards. All samples were activated in dilute acid as described in the prior art process above.
／′
規則に従うため本発明は特別な用語で記載したが、本発
明はここに開示された特別な態様に限定されないこと、
従って本発明は有効範囲内の如何なるその形態、変形ま
たは対当物のいずれも特許請求の範囲内にあるものと理
解さるべきである。/' Although the invention has been described in special terms to comply with the regulations, the invention is not limited to the particular embodiments disclosed herein;
Therefore, it is to be understood that the present invention, in any form, modification or equivalent thereof within its scope, is within the scope of the appended claims.
第１図は本発明の一実施例による流動床の断面図である
。
主要部分、の符号の説明 ）
１０・・・流動床型金属処理炉
１４・・・セラミックまたは類似物の絶縁体１５・・・
レトルト １６・・・ヒーター１８・・・カバー １９
・・・ノヤイロットバーナー２０・・・通気口 ２４・
・・加工片支持装置２６・・・分配装置プレート２８・
・・充満部２９・・・充満部入口
３．３６．３７・・・供給管路
６０・・・フローハネルである２
し１面の浄書（内容に変Ｅなし）
Ｆ１６．１
手続ネ市正書（方式）
％式％FIG. 1 is a cross-sectional view of a fluidized bed according to an embodiment of the present invention. Explanation of symbols for main parts) 10... Fluidized bed metal processing furnace 14... Ceramic or similar insulator 15...
Retort 16...Heater 18...Cover 19
...Noya pilot burner 20...Vent hole 24.
・Workpiece support device 26 ・Distributor plate 28 ・
... Filling section 29... Filling section inlet 3, 36, 37... Supply pipe line 60... Flow Hanel 2, 1-page engraving (no change in content) F16.1 Procedural City Official Book (Method) % formula %
Claims (1)
って活性化し、そして 該活性化されたステンレス鋼をその鋼に拡散しつる活性
化窒素を含む加熱流動床中の処理雰囲気に導入すること
を特徴とするステンレス鋼の硬化方法。 ２）活性化窒素がアンモニアから誘導される特許請求の
範囲第１項に記載のステンレス鋼の硬化方法。 ３）処理雰囲気もまた前記ステンレス鋼に拡散しうる活
性炭素を含む特許請求の範囲第２項に記載のステンレス
鋼の硬化方法。 ４）流動床温度が約５６５．６°Ｃ（１０５０°Ｆ）で
あり、前記ステンレス鋼が約１時間以上の間その中に保
持され、処理雰囲気が実質的に約１５％のアンモニアと
、約８５チの窒素とから成るガスの混合物から導かれる
ようにした特許請求の範囲第２項に記載のステンレス鋼
の硬化方法。 ５）流動床温度が約５’６５．６℃（１０５０’Ｆ）で
あシ、前記ステンレス鋼が約１時間以上の間その中に保
持され、処理雰囲気が実質的に約７５重量％の窒素と、
２５重量％のメタンとから成るガス混合物から導かれる
ようにした特許請求の範囲第２項に記載のステンレス鋼
の硬化方法。 ６）流動床温度が約５６５．６°Ｃ（１０５０°Ｆ）で
あり、前記ステンレス鋼が約１時間半以上の間その中に
保持され、処理雰囲気が実質的に約１０重量％のアンモ
ニアと、１０重量％のメタンと、残余が窒素とから成る
ガス混合物から導かれるようにした特許請求の範囲第２
項に記載のステンレス鋼の硬化方法。 ７）流動床温度が約８９９℃（１６５０’Ｆ）であり、
前記ステンレス鋼が約１時間以上の間その中に保持され
、処理雰囲気が実質的に約７重量％のアンモニア、２５
重量−のメタンおよび残余が窒素よシ成るガス混合物か
ら導かれるようにした特許請求の範囲第２項に記載のス
テンレス鋼の硬化方法。 ８）酸が９〜１２重量％の硝酸と、２重量％以下の塩酸
の水溶液である特許請求の範囲第４項に記載のステンレ
ス鋼の硬化方法。 ９）酸が９〜１２重量％の硝酸と、２重量％以下の塩酸
の水溶液である特許請求の範囲第５項に記載のステンレ
ス鋼の硬化方法。 １０）酸が９〜１２重量％の硝酸と、２重量％以下の塩
酸の水溶液である特許請求の範囲第６項に記載のステン
レス鋼の硬化方法。 １１）酸が９〜１２重量％の硝酸と、２重量％以下の塩
酸の水溶液である特許請求の範囲第７項に記載のステン
レス鋼の硬化方法。 】２）酸が５０〜９０重量％の塩酸の水溶液である特許
請求の範囲第７項に記載のステンレス鋼の硬化方法。Claims: 1) A processing atmosphere in a heated fluidized bed containing activated nitrogen that activates the stainless steel to be hardened by exposing it to acid and diffuses the activated stainless steel into the steel. A method for hardening stainless steel, characterized by introducing the method. 2) A method for hardening stainless steel according to claim 1, wherein the activated nitrogen is derived from ammonia. 3) A method of hardening stainless steel according to claim 2, wherein the treatment atmosphere also contains activated carbon that can diffuse into the stainless steel. 4) the fluidized bed temperature is about 565.6°C (1050°F), the stainless steel is held therein for about 1 hour or more, and the processing atmosphere is substantially about 15% ammonia and about 10% ammonia; A method as claimed in claim 2, characterized in that the hardening of stainless steel is conducted from a mixture of gases consisting of 85% nitrogen. 5) the fluidized bed temperature is about 5'65.6°C (1050'F), the stainless steel is held therein for about 1 hour or more, and the processing atmosphere is substantially about 75% nitrogen by weight; and,
2. A method for hardening stainless steel according to claim 2, characterized in that the hardening of stainless steel is conducted from a gas mixture consisting of 25% by weight of methane. 6) the fluidized bed temperature is about 565.6°C (1050°F), the stainless steel is held therein for about 1 1/2 hours or more, and the processing atmosphere is substantially about 10% by weight ammonia; , derived from a gas mixture consisting of 10% by weight of methane and the balance nitrogen.
Method of hardening stainless steel as described in Section. 7) the fluidized bed temperature is about 899°C (1650'F);
The stainless steel is held therein for a period of about 1 hour or more, and the processing atmosphere is substantially 7% by weight ammonia, 25% by weight.
3. A method for hardening stainless steel according to claim 2, wherein the weight of methane and the remainder are derived from a gas mixture consisting of nitrogen. 8) The method for hardening stainless steel according to claim 4, wherein the acid is an aqueous solution of 9 to 12% by weight of nitric acid and 2% by weight or less of hydrochloric acid. 9) The method for hardening stainless steel according to claim 5, wherein the acid is an aqueous solution of 9 to 12% by weight of nitric acid and 2% by weight or less of hydrochloric acid. 10) The method for hardening stainless steel according to claim 6, wherein the acid is an aqueous solution of 9 to 12% by weight of nitric acid and 2% by weight or less of hydrochloric acid. 11) The method for hardening stainless steel according to claim 7, wherein the acid is an aqueous solution of 9 to 12% by weight of nitric acid and 2% by weight or less of hydrochloric acid. 2) A method for hardening stainless steel according to claim 7, wherein the acid is an aqueous solution of 50 to 90% by weight hydrochloric acid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57468884A | 1984-01-27 | 1984-01-27 | |
| US574688 | 1984-01-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60215756A true JPS60215756A (en) | 1985-10-29 |
Family
ID=24297199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP420785A Pending JPS60215756A (en) | 1984-01-27 | 1985-01-16 | Hardening of stainless steel |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS60215756A (en) |
| DE (1) | DE3501409A1 (en) |
| GB (1) | GB2153855A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021095331A1 (en) * | 2019-11-11 | 2021-05-20 | 株式会社日立製作所 | Nitriding treatment method and nitriding treatment device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH089766B2 (en) * | 1989-07-10 | 1996-01-31 | 大同ほくさん株式会社 | Steel nitriding method |
| EP0408168B1 (en) * | 1989-07-10 | 1994-06-08 | Daidousanso Co., Ltd. | Method of pretreating metallic works and method of nitriding steel |
| JP2842712B2 (en) * | 1990-11-30 | 1999-01-06 | 大同ほくさん株式会社 | Mounting method |
| US5680172A (en) * | 1992-01-21 | 1997-10-21 | Video Post & Transfer, Inc. | Consecutive frame scanning of cinematographic film |
| EP1122331B1 (en) * | 2000-02-04 | 2003-03-26 | Ipsen International GmbH | Process of nitriding and/or carbonitriding of high-alloyed steel |
| SE525325C2 (en) | 2003-05-16 | 2005-02-01 | Sandvik Ab | Cutting tools for metalworking and method of manufacturing cutting tools |
| DE102006026883B8 (en) | 2006-06-09 | 2007-10-04 | Durferrit Gmbh | Process for hardening stainless steel and molten salt for carrying out the process |
-
1985
- 1985-01-16 JP JP420785A patent/JPS60215756A/en active Pending
- 1985-01-17 DE DE19853501409 patent/DE3501409A1/en not_active Withdrawn
- 1985-01-25 GB GB08501948A patent/GB2153855A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021095331A1 (en) * | 2019-11-11 | 2021-05-20 | 株式会社日立製作所 | Nitriding treatment method and nitriding treatment device |
| JP2021075766A (en) * | 2019-11-11 | 2021-05-20 | 株式会社日立製作所 | Nitriding treatment method and nitriding treatment apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8501948D0 (en) | 1985-02-27 |
| DE3501409A1 (en) | 1985-08-08 |
| GB2153855A (en) | 1985-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4547228A (en) | Surface treatment of metals | |
| US4671496A (en) | Fluidized bed apparatus for treating metals | |
| KR870010211A (en) | Improved Surface Wear Quality Metal Treatment | |
| JP3960697B2 (en) | Carburizing and carbonitriding methods | |
| JPS60215756A (en) | Hardening of stainless steel | |
| CN100494498C (en) | Method for surface treatment of metal material | |
| JPH0356304B2 (en) | ||
| US4152177A (en) | Method of gas carburizing | |
| US4756774A (en) | Shallow case hardening and corrosion inhibition process | |
| JPS6320908B2 (en) | ||
| US20030205297A1 (en) | Carburizing method | |
| CN101238236B (en) | Ion nitriding method | |
| GB2043117A (en) | Methods for heat treatment of ferrous parts | |
| DE50001540D1 (en) | Process for nitriding and / or nitrocarburizing higher alloy steels | |
| CZ288263B6 (en) | Process of uniform thermal carburization of steel structural parts having areas that are difficult accessible from outside | |
| US4042428A (en) | Process for hardening iron-containing surfaces with organic solvent and ammonia | |
| US4597807A (en) | Accelerated carburizing method with discrete atmospheres | |
| JP2009299122A (en) | Nitriding-quenching method, heater for nitriding-quenching and nitriding-quenching apparatus | |
| JP3721536B2 (en) | Carburizing method for narrow and deep holes | |
| JPH0312140B2 (en) | ||
| JP3429870B2 (en) | Surface hardening method for sintered parts | |
| SU1719461A1 (en) | Method of carbonitriding of steel products | |
| SU945244A1 (en) | Method for nitriding | |
| SU1617045A1 (en) | Method of nitrocarburizing steel articles | |
| Shepherd | Applications of fluidized bed furnaces for the heat treatment of tool steels |