JPS63274753A - Surface hardening method for metal - Google Patents
Surface hardening method for metalInfo
- Publication number
- JPS63274753A JPS63274753A JP10977487A JP10977487A JPS63274753A JP S63274753 A JPS63274753 A JP S63274753A JP 10977487 A JP10977487 A JP 10977487A JP 10977487 A JP10977487 A JP 10977487A JP S63274753 A JPS63274753 A JP S63274753A
- Authority
- JP
- Japan
- Prior art keywords
- metal surface
- metal
- hardness
- chromized
- chromizing
- 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
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000005254 chromizing Methods 0.000 claims abstract description 8
- 238000005121 nitriding Methods 0.000 claims abstract description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 229910021529 ammonia Inorganic materials 0.000 abstract description 5
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は金属表面の硬化処理法に関し、特に硬さを必要
とするボイラチューブ、機械構造物及び金属粉体等の表
面硬化法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for hardening metal surfaces, and particularly to a method for hardening the surfaces of boiler tubes, mechanical structures, metal powders, etc. that require hardness.
石炭灰などにより、磨耗などを受けるボイラチューブ及
び構造物にはその磨耗対策として、また、研粒、研削粒
などの金属粉体にはクロマイズ処理が笑施嘔れる場合が
ある。Boiler tubes and structures that are subject to abrasion due to coal ash etc. may be subjected to a chromizing treatment as a countermeasure against such abrasion, and abrasive grains and metal powders such as abrasive grains may be subjected to chromizing treatment.
クロマイズ処理は金属クロム、アルミナ、塩化アンモニ
ウムの混合物中に被処理材を埋め込み、水素雰囲気中で
加熱する方法であり、その厚みはフェライト系鋼の場合
１００μｍ前後、Ｃｒ 濃度は４０％前後、またその
硬さはＨｒ２００前後である。Chromizing treatment is a method in which the material to be treated is embedded in a mixture of metallic chromium, alumina, and ammonium chloride and heated in a hydrogen atmosphere. The hardness is around Hr200.
クロマイズ処理層の硬さはＨｖ２００前後と、母材のそ
れ（約Ｈｖ１４０）に比較すると大きいが、石炭灰等に
よる損傷抵抗を示す硬さはＨｖ８００前後が必要である
。従って、これより硬さの低いクロマイズ層は約６ケ月
〜１年間で消失し、十分な効果を期待できない等の欠点
があった。The hardness of the chromized layer is around Hv200, which is higher than that of the base material (about Hv140), but the hardness that shows damage resistance from coal ash etc. needs to be around Hv800. Therefore, the chromized layer, which has a lower hardness than this, disappears in about 6 months to 1 year, resulting in the disadvantage that sufficient effects cannot be expected.
本発明は上記技術水準に鑑み、表面硬さを飛躍的に高め
得る金属表面の硬化法を提供しようとするものである。In view of the above-mentioned state of the art, the present invention aims to provide a method for hardening metal surfaces that can dramatically increase surface hardness.
本発明はクロマイズ処理、窒化処理を任意の順序で金属
表面を処理することｔ−特徴とする金属表面硬化法であ
る。The present invention is a metal surface hardening method characterized by treating the metal surface with chromizing treatment and nitriding treatment in any order.
すなわち、本発明は先ず金属表面を常法によｐクロマ１
ズ処理した後、更に続いて該表面を窒化処理（例えば２
０〜２５％分解させたアンモニア雰囲気中での５５０℃
前後の加熱）してもよく、先ず金属表面を２０〜２５％
分解させたアンモニア雰囲気中で５５０℃前後の温度に
加熱して窒素が過飽和に固溶したα相を形成させ、更に
続いて該表面を常温によってクロマイズ処理してもよい
。That is, in the present invention, the metal surface is first coated with p chroma 1 by a conventional method.
After the nitriding treatment, the surface is further subjected to a nitriding treatment (for example, 2
550℃ in an ammonia atmosphere with 0-25% decomposition
The metal surface may be heated by 20-25% first.
It may be heated to a temperature of around 550° C. in an atmosphere of decomposed ammonia to form an α phase in which nitrogen is supersaturated as a solid solution, and then the surface may be chromized at room temperature.
金属表面を、窒化処理及びりａマイズ処理することによ
’）、Ｈｖ １２ｏｏ１有するクロム窒化物が形成され
、これにより耐摩耗性が大幅に増加した金属表面が得ら
れる。By nitriding and atomizing the metal surface, chromium nitride with Hv 12oo1 is formed, which results in a metal surface with significantly increased wear resistance.
〔実施例１〕
本発明の一実施例ｔ−第第１一〜Ｗｃ４によって説明す
る。[Example 1] An example t-11 to Wc4 of the present invention will be described.
＠１図に示すように、先ず５ＴＢＡ ２４ （２１／４
％Ｃｒ−ｊ％Ｍｏ ）のボイラチューブ（φ５αＢ×ｔ
＆０ＸＬ５００畷）１を金属クロム、アルミナ、塩化ア
ンモニウムの混合物２の中に埋め込み、水素雰囲気中で
１０５０℃、１０時間加熱し、これを９４０℃で１時間
焼きならしを行い、その後７２０℃、４０分間のｇ８き
戻し処理を実施した。これにより第２図に示すようにボ
イラチューブ１の表面罵は約１００μｍの厚さで４０チ
程度のクロムを含み、硬さがＨｖ２００程度を有するク
ロマイズ層５が形成された。As shown in Figure @1, first 5TBA 24 (21/4
%Cr-j%Mo) boiler tube (φ5αB×t
&0XL500Naw) 1 was embedded in a mixture 2 of metallic chromium, alumina, and ammonium chloride, heated in a hydrogen atmosphere at 1050°C for 10 hours, normalized at 940°C for 1 hour, and then heated at 720°C for 40 hours. A g8 return process was performed for 1 minute. As a result, as shown in FIG. 2, a chromized layer 5 was formed on the surface of the boiler tube 1 with a thickness of about 100 .mu.m, containing about 40 chrome of chromium, and having a hardness of about 200 Hv.
次に、このものを第５図に示すように、２０へ２５チ分
解させ次アンモニアガス雰囲気４中で５５０℃Ｘ４０時
間加熱し、クロマイズ層３に窒化処理を実施した。なお
図中、５，６はアンそニア入口、出口を示す。これによ
り第４図に示すように第２図のクロマイズ層３は窒化さ
れ、クロムと窒素よりなる窒化物層７となり、Ｈｖ１２
００と高い硬さを有した。Next, as shown in FIG. 5, this product was decomposed into 20 and 25 parts, and then heated in an ammonia gas atmosphere 4 at 550° C. for 40 hours to nitride the chromized layer 3. In the figure, numerals 5 and 6 indicate anthonia inlet and outlet. As a result, as shown in FIG. 4, the chromized layer 3 in FIG. 2 is nitrided to become a nitride layer 7 made of chromium and nitrogen, with Hv12
It had a high hardness of 0.00.
〔実施例２〕
本発明の他の実施例を第５図〜第８図によって説明する
。第５図に示すように、先ず８ＴＢＡ２４（２１７４％
Ｃｒ −１％Ｍｏ ）のボイラチューブ（φ５［Ｌ８Ｘ
ｔ＆０Ｘｔ５００ｔｍ ） １ ｆ ２０〜２５％分解
させたアンモニアガス雰囲気２中で５５０’ＣＸ４０Ｆ
￥ｆ間加熱し、−チューブ表面に窒化処理を実施した。[Embodiment 2] Another embodiment of the present invention will be described with reference to FIGS. 5 to 8. As shown in Figure 5, first, 8TBA24 (2174%
Boiler tube (φ5 [L8X
t&0Xt500tm) 1 f 550'CX40F in 20-25% ammonia gas atmosphere 2
The tube was heated for ¥f, and the surface of the tube was nitrided.
これにより、第６図に示すようにボイラチューブ１の表
面に窒化層５が形成され次。なお！＠５図中、３，４は
アンモニアの入口、出口を示す。As a result, a nitride layer 5 is formed on the surface of the boiler tube 1 as shown in FIG. In addition! @5 In the figure, 3 and 4 indicate the ammonia inlet and outlet.
次にこれｔｉ７図に示すように金属クロム、アルミナ、
塩化アンモニウムの混合物６の中に埋め込み水素雰囲気
中で１０５０℃で１０時間加熱し、これを９４０℃で１
時間焼きならしを行い、その後７２０℃で４０分間の焼
き戻し処理全実施し念。Next, as shown in the ti7 diagram, metal chromium, alumina,
It was buried in ammonium chloride mixture 6 and heated at 1050°C for 10 hours in a hydrogen atmosphere, and then heated at 940°C for 1 hour.
After normalizing for a few hours, we thoroughly tempered it at 720℃ for 40 minutes.
これにより第６図に示すように、ボイラチューブ１の表
面には約１００βｍの厚さで硬さがＨｖ１２００からな
るクロム窒化物（Ｃｒ２Ｎ ） 層７が形成された０
〔発明の効果〕
金属表面をクロマイズ処理と窒化処理することにより、
約Ｈｖ１２ｏＯを有するクロム窒化物が形成され、これ
によｐｉｔｓ耗注が大巾に向上したＯAs a result, as shown in FIG. 6, a chromium nitride (CrN) layer 7 having a thickness of approximately 100 βm and a hardness of Hv 1200 is formed on the surface of the boiler tube 1. By chromizing and nitriding,
O
Claims (1)
理することを特徴とする金属表面硬化法。A metal surface hardening method characterized by treating a metal surface with chromizing treatment and nitriding treatment in any order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10977487A JPS63274753A (en) | 1987-05-07 | 1987-05-07 | Surface hardening method for metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10977487A JPS63274753A (en) | 1987-05-07 | 1987-05-07 | Surface hardening method for metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63274753A true JPS63274753A (en) | 1988-11-11 |
Family
ID=14518886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10977487A Pending JPS63274753A (en) | 1987-05-07 | 1987-05-07 | Surface hardening method for metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63274753A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6090223A (en) * | 1997-06-25 | 2000-07-18 | Showa Denko K.K. | Chromium nitride film and method for forming the same |
| WO2016056491A1 (en) * | 2014-10-07 | 2016-04-14 | エア・ウォーターＮｖ株式会社 | Method for altering surface of metal, and metallic product |
| CN114059012A (en) * | 2021-11-18 | 2022-02-18 | 四川华都核设备制造有限公司 | Method for heat treatment of surface of metal product |
-
1987
- 1987-05-07 JP JP10977487A patent/JPS63274753A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6090223A (en) * | 1997-06-25 | 2000-07-18 | Showa Denko K.K. | Chromium nitride film and method for forming the same |
| WO2016056491A1 (en) * | 2014-10-07 | 2016-04-14 | エア・ウォーターＮｖ株式会社 | Method for altering surface of metal, and metallic product |
| JP2016074948A (en) * | 2014-10-07 | 2016-05-12 | エア・ウォーターＮｖ株式会社 | Surface modification method of metal and metal product |
| CN106687615A (en) * | 2014-10-07 | 2017-05-17 | 爱沃特Nv株式会社 | Method for altering surface of metal, and metallic product |
| US10156008B2 (en) | 2014-10-07 | 2018-12-18 | Air Water Nv Inc. | Method for altering surface of metal, and metallic product |
| CN106687615B (en) * | 2014-10-07 | 2020-07-17 | 爱沃特Nv株式会社 | Method for modifying surface of metal and metal product |
| CN114059012A (en) * | 2021-11-18 | 2022-02-18 | 四川华都核设备制造有限公司 | Method for heat treatment of surface of metal product |
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