JPS6056792B2 - Rapid nitriding method for stainless steel and heat-resistant steel using melting - Google Patents
Rapid nitriding method for stainless steel and heat-resistant steel using meltingInfo
- Publication number
- JPS6056792B2 JPS6056792B2 JP12362278A JP12362278A JPS6056792B2 JP S6056792 B2 JPS6056792 B2 JP S6056792B2 JP 12362278 A JP12362278 A JP 12362278A JP 12362278 A JP12362278 A JP 12362278A JP S6056792 B2 JPS6056792 B2 JP S6056792B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- steel
- stainless steel
- melting
- resistant steel
- 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
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
- C23C8/08—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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【発明の詳細な説明】
この発明はステンレス鋼及び耐熱鋼あるいはこれらと
類似の化学組成ならびに性質をもつ鋼材の耐摩耗性及び
疲れ強さの向上をはかるための、溶融を利用したステン
レス鋼及び耐熱鋼の迅速窒化方法に関する。DETAILED DESCRIPTION OF THE INVENTION This invention is a stainless steel and heat-resistant steel that utilizes melting to improve the wear resistance and fatigue strength of stainless steel, heat-resistant steel, or steel materials with similar chemical compositions and properties. Concerning a method for rapid nitriding of steel.
ステンレス鋼、耐熱鋼などの硬化法は、全体焼入れあ
るいは高周波焼入れなどの素材の加熱冷却による相変態
を利用して硬化する方法、あるいは窒化（ガス、塩浴及
びイオン）などの金相学的因子を変えることにより硬化
する方法が行なわれているが、前者は素材の炭素量が少
ない場合には充分な硬さが得られない欠点があり、また
後者は、ステンレス鋼や耐熱鋼の表面に生成しているク
ロム酸化膜を除去する複雑て高い技術を要する前処理が
必要であり、かつその後の処理にも数十時間を要するな
どの欠点があつた。Hardening methods for stainless steel, heat-resistant steel, etc. utilize phase transformation by heating and cooling the material, such as total quenching or induction hardening, or change metallurgical factors such as nitriding (gas, salt bath, and ions). However, the former method has the disadvantage that sufficient hardness cannot be obtained when the carbon content of the material is small, and the latter method hardens the material by forming it on the surface of stainless steel or heat-resistant steel. However, there were drawbacks such as requiring complicated and sophisticated pre-treatment to remove the chromium oxide film present in the process, and the subsequent treatment taking several tens of hours.
また、、イオン窒化はガス窒化のような前処理は不要で
あるが、バッチ式の真空装置は不可欠であり、そのとき
の処理時間も数時間以上を要し、生産性及びコストてガ
スあるいは塩浴窒化よりも劣つている。 ステンレス鋼
及び耐熱鋼をアーク熱により加熱溶融し、当該溶融部分
に、窒化ガスあるいはアンモニアガスなどの窒素含有ガ
スを吹きつけてこれらを溶融金属中に浸入させ、Ｆｅ、
、Ｃｒなどの窒化物生成元素と反応させて短時間て必要
な部分のみに充分な硬さを与えることが可能な迅速窒化
方法を提供することを目的とする。In addition, although ion nitriding does not require pretreatment like gas nitriding, a batch-type vacuum device is essential, and the processing time is several hours or more, reducing productivity and cost. It is inferior to bath nitriding. Stainless steel and heat-resistant steel are heated and melted using arc heat, and a nitrogen-containing gas such as nitriding gas or ammonia gas is blown onto the melted portion to infiltrate the molten metal.
An object of the present invention is to provide a rapid nitriding method capable of imparting sufficient hardness to only necessary parts in a short period of time by reacting with nitride-forming elements such as Cr and Cr.
本発明は、高周波誘導加熱装置、プラズマアーク、ガ
スアークなど適当な加熱源を用いてステンレス鋼及び耐
熱鋼あるいはこれらと類似の化学組成ならびに性質をも
つ鋼材を局部的に溶融し、その溶融部分に向けて窒素あ
るいはアンモニアガスなど窒素を含むガスを吹きつけて
、短い時間てＦｅＮＣｒなどの窒化物生成元素と反応さ
せて窒化物を生成させ、充分な硬さを得るようにしたも
のである。The present invention involves locally melting stainless steel, heat-resistant steel, or steel materials with similar chemical compositions and properties using a suitable heating source such as a high-frequency induction heating device, plasma arc, or gas arc, and directing the melted part toward the melted part. A nitrogen-containing gas such as nitrogen or ammonia gas is blown onto the surface of the material, and the material reacts with a nitride-forming element such as FeNCr for a short period of time to produce nitrides, thereby obtaining sufficient hardness.
ここで、素材をステンレス鋼及び耐熱鋼あるいはこれ
らと類似の化学組成ならびに性質をもつ鋼材に限定した
理由は、Ｊ１５Ｇ４３０３〜ＪＩＳＧ４３０９、Ｊ１５
Ｇ４３１１〜ＪＩＳＧ４３１反ＪＩＳＧ４９０１、ＪＩ
ＳＧ４９０２などで規定されるステンレス鋼、耐熱鋼な
どの化学成分からも明らかなように、多量のＣｒ、Ｎｉ
を含んでおり、Ｃｒが安定な窒化物生成元素であり、窒
化によつて容易に窒化物を生成し硬化に寄与すること、
並びにＣｒの不動態皮膜が存在し、従来のガス窒化など
ではＣｒの不動態皮膜を除去しないかぎり窒化は非常に
困難であり、高度の技術を要する不動態皮膜除去処理が
前処理として行なわれていたが、本発明では溶融によつ
て容易に不動態皮膜を破壊することができるなど、ステ
ンレス鋼、耐熱鋼などにおいて本発明の顕著な効果が認
められるためである。Here, the reason why we limited the materials to stainless steel, heat-resistant steel, or steel materials with similar chemical compositions and properties is that J15G4303 to JISG4309, J15
G4311~JISG431 anti-JISG4901, JI
As is clear from the chemical composition of stainless steel, heat-resistant steel, etc. specified by SG4902, large amounts of Cr and Ni
Cr is a stable nitride-forming element, easily generates nitrides through nitriding, and contributes to hardening;
In addition, a passive film of Cr exists, and nitriding is extremely difficult with conventional gas nitriding unless the passive film of Cr is removed, so a process to remove the passive film, which requires advanced technology, is performed as a pretreatment. However, this is because the present invention has remarkable effects on stainless steel, heat-resistant steel, etc., such as the ability to easily destroy the passive film by melting.
また、溶融部に吹きつけられたガス中の窒素（Ｎ２）は
高温にさらされることによつて活性化されてＮとなり、
溶融金属に溶け込んでＦｅあるいはＣｒなどの窒化物を
生成する。In addition, nitrogen (N2) in the gas blown onto the molten part is activated by being exposed to high temperatures and becomes N.
It dissolves in molten metal to generate nitrides such as Fe or Cr.
溶融部に吹きつけるガスとしてはＮ２を含むものであれ
ばいずれも同程度の効果を示すもので、たとえばアンモ
ニアガスの場合、加熱に際しての反応で発生するＨ２が
吸収され、その後の性質に悪影響を与えることもあるの
で窒素ガス単体がのぞましい。Any gas containing N2 that is blown onto the molten part will have the same effect.For example, in the case of ammonia gas, H2 generated during the reaction during heating will be absorbed, which will have an adverse effect on the subsequent properties. Nitrogen gas alone is preferable, as it can sometimes give.
次にこの発明の具体例について述べると、加熱源にプラ
ズマアークを用い、アーク電流４０Ａ１トーチ移動速度
０．７ＴｒＬ／分でＳＵＳ４Ｏ３を加熱溶融し、反応ガ
スとして窒素ガスを用いたところ硬度ＦＩＶ５６Ｏｌ硬
化層深さ１．５Ｔｗｔの窒化層が得られた。なお上記の
硬化層を得るに要した時間は約（イ）秒であつた。以上
説明したように、本発明によつて、ステンレス鋼及び耐
熱鋼あるいはこれらと類似の化学組成ならびに性質をも
つ鋼材の窒化処理が、従来の窒化処理方法に比べて極め
て短時間て行なうことができる。Next, to describe a specific example of the present invention, SUS4O3 was heated and melted using a plasma arc as a heating source at an arc current of 40 A and a torch movement speed of 0.7 TrL/min, and nitrogen gas was used as a reaction gas. A nitride layer with a depth of 1.5 Twt was obtained. The time required to obtain the above-mentioned cured layer was approximately (a) seconds. As explained above, according to the present invention, nitriding of stainless steel, heat-resistant steel, or steel materials with similar chemical compositions and properties can be carried out in an extremely short time compared to conventional nitriding methods. .
Claims (1)
鋼材表面をアーク熱により加熱溶融し、窒素含有ガスを
溶融金属に吹きつけて反応させることを特徴とする溶融
を利用したステンレス鋼及び耐熱鋼の迅速窒化方法。1. In the method of nitriding stainless steel and heat-resistant steel,
A rapid nitriding method for stainless steel and heat-resistant steel that utilizes melting, characterized by heating and melting the surface of a steel material using arc heat, and blowing a nitrogen-containing gas onto the molten metal to cause a reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12362278A JPS6056792B2 (en) | 1978-10-09 | 1978-10-09 | Rapid nitriding method for stainless steel and heat-resistant steel using melting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12362278A JPS6056792B2 (en) | 1978-10-09 | 1978-10-09 | Rapid nitriding method for stainless steel and heat-resistant steel using melting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5550458A JPS5550458A (en) | 1980-04-12 |
| JPS6056792B2 true JPS6056792B2 (en) | 1985-12-11 |
Family
ID=14865137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12362278A Expired JPS6056792B2 (en) | 1978-10-09 | 1978-10-09 | Rapid nitriding method for stainless steel and heat-resistant steel using melting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6056792B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0433914B2 (en) * | 1985-08-08 | 1992-06-04 | Aikawa Tekko |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6387916B2 (en) * | 2015-07-15 | 2018-09-12 | トヨタ自動車株式会社 | Method and apparatus for hardening steel surface |
-
1978
- 1978-10-09 JP JP12362278A patent/JPS6056792B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0433914B2 (en) * | 1985-08-08 | 1992-06-04 | Aikawa Tekko |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5550458A (en) | 1980-04-12 |
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