JPS63192854A - Surface hardening method for metal - Google Patents
Surface hardening method for metalInfo
- Publication number
- JPS63192854A JPS63192854A JP2256487A JP2256487A JPS63192854A JP S63192854 A JPS63192854 A JP S63192854A JP 2256487 A JP2256487 A JP 2256487A JP 2256487 A JP2256487 A JP 2256487A JP S63192854 A JPS63192854 A JP S63192854A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- layer
- hardness
- chromium
- chromized
- 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 11
- 239000002184 metal Substances 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- 239000011651 chromium Substances 0.000 claims description 10
- 238000005255 carburizing Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000010410 layer Substances 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 239000002344 surface layer Substances 0.000 abstract description 4
- 229910017060 Fe Cr Inorganic materials 0.000 abstract 2
- 229910002544 Fe-Cr Inorganic materials 0.000 abstract 2
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 abstract 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000005254 chromizing Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910003470 tongbaite Inorganic materials 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〕
本発明は金属の表面を硬化する方法に関し、特に硬さを
必要とするボイラチューブ及びその他の機械構造物製作
に有利に適用される金属表面の硬化法に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for hardening metal surfaces, and in particular to metal surfaces that are advantageously applied to manufacturing boiler tubes and other mechanical structures that require hardness. Concerning the curing method.
石炭灰等によシ摩耗等を受けるボイラチューブ及び構造
物には、その摩耗対策としてクロマイズ処理が実施され
る場合がある。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
イト系鋼の場合的１００μ、Ｏｒ濃度け４０チ前後、ま
た社硬さは２００ Ｈｖ前後である。Boiler tubes and structures that are subject to abrasion due to coal ash, etc. are sometimes subjected to chromization treatment as a countermeasure against such abrasion. Chromize treatment embeds the material to be treated in a mixture of metallic chromium, alumina, and ammonium chloride.
It is a method of heating in a hydrogen atmosphere, and the thickness is 100 μm in the case of ferritic steel, the Or concentration is around 40 inches, and the steel hardness is around 200 Hv.
クロマイズ処理層の硬さは２００ ＨＶと、母材のそれ
（１４０Ｈｖ）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８００Ｈｖ前後なので、これよシ硬
さの低いクロマイズ層は約［１５〜１年で消失し、十分
な効果を発揮できない等の欠点があった。The hardness of the chromized layer is 200 HV, which is higher than that of the base material (140 Hv), but the hardness that shows damage resistance from coal ash, etc. is around 800 HV, so the chromized layer, which has a lower hardness, has a hardness of about [ It has disadvantages such as disappearing after 15 to 1 year and not being able to exhibit sufficient effects.
本発明は上記従来のクロマイズ処理層の硬さより高い硬
さを有する表面層を有する金属を得る方法を提供しよう
とするものである０〔問題点を解決するための手段〕
本発明はクロム濃度を高めた金属の表面に浸炭処理を行
いその部分に高い硬度を有する鉄とクロムとの複合炭化
物を形成させることを特徴とする金属の表面硬化法であ
る。The present invention aims to provide a method for obtaining a metal having a surface layer having a hardness higher than that of the conventional chromized layer. This is a metal surface hardening method characterized by carburizing the elevated metal surface to form a composite carbide of iron and chromium with high hardness in that area.
すなわち、本発明は先ず金属の表面をクロマイズ処理し
てクロム濃度を高めた金属を、浸炭雰囲気中で加熱し、
クロマイズ層を鉄とクロムの複合炭化物忙変化させ、そ
の表面層を約１２００ｉｆマの硬さＫするものである。That is, the present invention first heats a metal whose surface has been chromized to increase the chromium concentration in a carburizing atmosphere,
The chromized layer is made of a composite carbide of iron and chromium, and the surface layer has a hardness of about 1200 IF.
クロマイズ処理後、浸炭熱処理を実施したことにより、
約２００ Ｈｖのクロマイズ層が１２００Ｈｖ を有
する鉄とクロムの複合炭化物に変化する。とれによシ耐
摩耗性が従来よシ大巾に向上する。By performing carburizing heat treatment after chromizing treatment,
The chromized layer of approximately 200 Hv changes to a composite carbide of iron and chromium having a power of 1200 Hv. The wear resistance is greatly improved compared to conventional products.
以下、本発明の一実施例を第１図によって説明する。 An embodiment of the present invention will be described below with reference to FIG.
先ず第１図（４〕Ｋ示すように、ａＴＢム２４（２’／
ａ ％ ０ｒ−１％ Ｎｏ ）のボイラチューブ（５（
１８＄Ｘｔｏｔｘｓｏｏｌ） 、ｔ を、金属クロム
、アルミナ、塩化アンモニウムの混合物中 ２．に埋め
込み、水素雰囲気中で１０５０°０で１０時間加熱し、
これを９４０°０で１時間焼きならしを行い、その後、
７２０°Ｃ×４０分の焼き戻し処理を実施した０これに
より （Ｂ）に示すようにボイラチューブ １０表面に
は約１００μｍの厚さで４０％程度のクロムを含み、硬
さが２００ ＨＶ程度を有するクロマイズ層 ３・が形
成された。First, as shown in FIG. 1(4)K, the aTB module 24(2'/
a % 0r-1% No ) boiler tube (5 (
18$Xtotxsool), t in a mixture of metallic chromium, alumina, and ammonium chloride. , and heated at 1050°0 for 10 hours in a hydrogen atmosphere.
This was normalized at 940°0 for 1 hour, and then
Tempering treatment was carried out at 720°C for 40 minutes. As a result, as shown in (B), the surface of the boiler tube has a thickness of about 100 μm, contains about 40% chromium, and has a hardness of about 200 HV. A chromized layer 3 was formed.
これを（０）に示すように００２０〜４０％。This is 0020-40% as shown in (0).
ＯＨ，３〜３０％、 Ｈ，３０％以上、Ｃｏ、Ｑ、５％
以下、馬０α５％以下、残りＮ、の雰囲気中 ４で９０
０°０で１時間加熱し、クロマイズ層 ３に浸炭処理を
実施した。これによ！Ｄ （Ｄ）に示すように形成され
た層 ５ は鉄とクロムの複合炭化物であり約１２００
ＨＶ と高い硬度を有した。OH, 3-30%, H, 30% or more, Co, Q, 5%
Below, in an atmosphere where horses are 0α5% or less, remaining N, 4 is 90
The chromized layer 3 was carburized by heating at 0°0 for 1 hour. This is it! The layer 5 formed as shown in D (D) is a composite carbide of iron and chromium and has a thickness of about 1200
It had a high hardness of HV.
クロマイズ処理された材料を浸炭雰囲気中で加熱するこ
とによプ約１２００ｉｎ を有する鉄とクロムの複合
炭化物層が形成された。これＫよシ耐摩耗性は大巾に向
上した。By heating the chromized material in a carburizing atmosphere, a composite iron and chromium carbide layer having a diameter of about 1200 inches was formed. The wear resistance has been greatly improved compared to K.
第１図は本発明の一実施例の工種をかす図である。 FIG. 1 is a schematic diagram of an embodiment of the present invention.
Claims (1)
分に高い硬度を有する鉄とクロムとの複合炭化物を形成
させることを特徴とする金属の表面硬化法。A metal surface hardening method characterized by carburizing the surface of a metal with a high chromium concentration to form a complex carbide of iron and chromium with high hardness in that area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2256487A JPS63192854A (en) | 1987-02-04 | 1987-02-04 | Surface hardening method for metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2256487A JPS63192854A (en) | 1987-02-04 | 1987-02-04 | Surface hardening method for metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63192854A true JPS63192854A (en) | 1988-08-10 |
Family
ID=12086370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2256487A Pending JPS63192854A (en) | 1987-02-04 | 1987-02-04 | Surface hardening method for metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63192854A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02213461A (en) * | 1989-02-14 | 1990-08-24 | Mitsubishi Heavy Ind Ltd | Method for surface-hardening iron-based metallic material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5020936A (en) * | 1973-06-25 | 1975-03-05 | ||
| JPS57134551A (en) * | 1981-02-14 | 1982-08-19 | Sumitomo Metal Ind Ltd | Manufacture of corrosion resistant steel pipe with superior workability and high temperature strength |
| JPS61194170A (en) * | 1985-02-20 | 1986-08-28 | Kawasaki Heavy Ind Ltd | Surface treatment of ferrous metal |
-
1987
- 1987-02-04 JP JP2256487A patent/JPS63192854A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5020936A (en) * | 1973-06-25 | 1975-03-05 | ||
| JPS57134551A (en) * | 1981-02-14 | 1982-08-19 | Sumitomo Metal Ind Ltd | Manufacture of corrosion resistant steel pipe with superior workability and high temperature strength |
| JPS61194170A (en) * | 1985-02-20 | 1986-08-28 | Kawasaki Heavy Ind Ltd | Surface treatment of ferrous metal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02213461A (en) * | 1989-02-14 | 1990-08-24 | Mitsubishi Heavy Ind Ltd | Method for surface-hardening iron-based metallic material |
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