JPH01298136A - Heat-resistant cast steel having excellent carburization resistance - Google Patents
Heat-resistant cast steel having excellent carburization resistanceInfo
- Publication number
- JPH01298136A JPH01298136A JP12887088A JP12887088A JPH01298136A JP H01298136 A JPH01298136 A JP H01298136A JP 12887088 A JP12887088 A JP 12887088A JP 12887088 A JP12887088 A JP 12887088A JP H01298136 A JPH01298136 A JP H01298136A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- cast steel
- resistant cast
- carburization
- resistance
- 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
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 20
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 229910052721 tungsten Inorganic materials 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005255 carburizing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical group 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000006057 reforming reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、耐熱鋳鋼に関し、より具体的には、石油化学
工業におけるナフサ等の炭化水素類の熱分解・改質反応
に使用される反応用管、浸炭熱処理炉の炉内材料等とし
て好適な耐浸炭性にすぐれる耐熱鋳鋼に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to heat-resistant cast steel, and more specifically, to heat-resistant cast steel, and more specifically, to heat-resistant cast steel, and more specifically to heat-resistant cast steel. The present invention relates to heat-resistant cast steel with excellent carburization resistance and suitable as a material for use in pipes, carburizing heat treatment furnaces, etc.
〈従来技術とその問題点）
石油化学工業における炭化水素類の熱分解・改質反応で
は、炭化水素類の化学反応に件ってカーボンが反応管の
管壁表面に析出し、このカーボンが管の金属材料中へ拡
散していき、いわゆる浸炭現象が生じる。浸炭が生ずる
と、管の材質が著しく脆化する。<Prior art and its problems] In the thermal decomposition and reforming reactions of hydrocarbons in the petrochemical industry, carbon is deposited on the surface of the reaction tube wall during the chemical reaction of the hydrocarbons, and this carbon is deposited on the tube wall surface of the reaction tube. diffuses into the metal material, resulting in the so-called carburization phenomenon. When carburization occurs, the tube material becomes extremely brittle.
前記反応管の材料として従来からＡＳＴＭ規格のＨＫ４
０材やＨＰ材などが使用されている。又、Ｎｂ、Ｗ、Ｍ
ｏなどをＨＰ材に添加した所謂ＨＰ改良材も開発されて
、実用に供されている。しかし、これらＨＫ４０、ＨＰ
又はＨＰ改良材の場合、１１００℃を超える高温域では
浸炭が加速されて、材質が劣化するため、これらの材料
では浸炭の問題について対応が困難になってきている。ASTM standard HK4 has been used as the material for the reaction tube.
0 material and HP material are used. Also, Nb, W, M
A so-called HP improving material in which o and the like are added to the HP material has also been developed and put into practical use. However, these HK40, HP
Alternatively, in the case of HP improved materials, carburization is accelerated in a high temperature range exceeding 1100° C. and the material quality deteriorates, so it is becoming difficult to deal with the problem of carburization with these materials.
一方、最近では操業温度が高温化しており、高温におけ
る耐浸炭性にすぐれた材料の出現が要請されている。On the other hand, recently, operating temperatures have been increasing, and there is a demand for materials with excellent carburization resistance at high temperatures.
本発明はかかる要請を満たした新規な耐熱鋳鋼を提供す
るものである。The present invention provides a new heat-resistant cast steel that satisfies such requirements.
（技術的手段及び作用）
本発明にかかる耐熱鋳鋼は、Ｃ：０．３〜０．′７％、
Ｓに３〜５％、Ｍｎ；５〜１０％、Ｃｒ：２３〜３０％
、Ｎｉ：５〜３０９６、Δｌ：ｏ、５〜５．０％を含有
すると共に、Ｎｂ：０．２〜２．０％及び／又はＷｈｏ
、２〜２．０％分含有し、残部実質的にＦｅから成る成
分組成を有している。尚、上記の「％」は全て重呈「％
」であり、以下の説明においても同様である。(Technical means and effects) The heat-resistant cast steel according to the present invention has a C: 0.3 to 0. '7%,
S: 3-5%, Mn: 5-10%, Cr: 23-30%
, Ni: 5 to 3096, Δl:o, 5 to 5.0%, and Nb: 0.2 to 2.0% and/or Who
, 2 to 2.0%, with the remainder essentially consisting of Fe. In addition, the above "%" is all weighted "%"
”, and the same applies to the following description.
本発明の耐熱ｙＪ鋼は、例えば１１００℃を超える高温
域において、耐酸化性、クリープ破断強度等に関する所
定の高温特性を具偏すると共に、すぐれた耐浸炭性を備
えるものである。The heat-resistant yJ steel of the present invention exhibits predetermined high-temperature properties such as oxidation resistance and creep rupture strength in a high-temperature range exceeding 1100°C, for example, and has excellent carburization resistance.
本発明の耐熱鋳鋼の成分限定理由は次のとおりである。The reasons for limiting the components of the heat-resistant cast steel of the present invention are as follows.
Ｃ・０３〜０．７％
Ｃは、合金の鋳造性と良好にするだけでなく、高温にお
けるクリープ破断強度を高める作用がある。このため、
少なくとも０．３％を含有する−を要がある。しかし、
Ｃｊｌが過度に多くなると、Ｃｒ等との二次炭化物が５
量に析出することにより、延性、熱疲労に対する耐久性
の低下が著しくなる。C.03 to 0.7% C not only improves the castability of the alloy, but also has the effect of increasing creep rupture strength at high temperatures. For this reason,
It must contain at least 0.3%. but,
When Cjl increases excessively, secondary carbides with Cr etc.
Due to the large amount of precipitation, the ductility and durability against thermal fatigue are significantly reduced.
促って０．７％を上限とする。The upper limit will be set at 0.7%.
Ｓｉ：３〜５％
Ｓｉは、耐浸炭性の改善に欠くことのできない元素であ
る。しかし、３％以下では耐浸炭性の顕著な改善効果を
期待できない。又、５％を超えると、高温での使用中に
σ相が現われ、組織が不安定になって脆化しやすくなる
。このため、３〜５％に規定する。Si: 3-5% Si is an element indispensable for improving carburization resistance. However, if it is less than 3%, no significant improvement in carburization resistance can be expected. Moreover, if it exceeds 5%, a σ phase will appear during use at high temperatures, making the structure unstable and prone to embrittlement. Therefore, it is specified at 3 to 5%.
Ｍｎ：５〜１０％
Ｍｎは、オーステナイト相を安定化させる作用のほか、
耐浸炭性の改善に大きく寄与する。５％よりも少ないと
その効果が十分でなく、１０％を超えると高温使用中に
σ相が現われ、材［ｌを脆化させる。このため、５〜１
０％に規定する。Mn: 5-10% Mn has the effect of stabilizing the austenite phase, as well as
It greatly contributes to improving carburization resistance. If it is less than 5%, the effect will not be sufficient, and if it exceeds 10%, a σ phase will appear during high temperature use, making the material brittle. For this reason, 5 to 1
Define it as 0%.
Ｃｒ：２３〜３０％
Ｃｒは、Ｍｎ及び後記するＮｉと共に、金属組織をオー
ステナイト化し、高温強度や耐酸化性を高める効果を有
する。特に１１００℃以上の高温域での使用における強
度及び耐酸化性を十分なものとするには、少なくとも２
３％以上含有する必要がある。この効果は、Ｃｒ量の増
加とともに高められるが、余り多く含有すると、鋳造時
及び使用後の靭性の低下を招くこともあるので、上限は
３０％とする。Cr: 23-30% Cr, together with Mn and Ni (described later), has the effect of austenitizing the metal structure and improving high-temperature strength and oxidation resistance. In particular, in order to obtain sufficient strength and oxidation resistance when used in a high temperature range of 1100°C or higher, at least 2
It is necessary to contain 3% or more. This effect is enhanced as the amount of Cr increases, but if it is contained too much, it may lead to a decrease in toughness during casting and after use, so the upper limit is set at 30%.
Ｎｉ：５〜３０％
Ｎｉは、Ｃｒ、Ｍｎと共存してオーステナイト組織を安
定ｆヒさせる作用があり、更に耐浸炭性と耐酸化性及び
高温強度を確保するのに有効な元素である。特に、１１
００°Ｃ以上の高温域での使用において良好な耐酸化性
及び耐浸炭性を確保するには少なくとも５％以上含有す
る必要がある。この効果はＮｉ量の増加と共に高められ
るが、３０９６を超えるとその効果は飽和し、経済的に
も不利となるため、３０％を上限とする。Ni: 5-30% Ni coexists with Cr and Mn and has the effect of stabilizing the austenite structure, and is also an effective element for ensuring carburization resistance, oxidation resistance, and high-temperature strength. In particular, 11
In order to ensure good oxidation resistance and carburization resistance when used in a high temperature range of 00°C or higher, it is necessary to contain at least 5% or more. This effect is enhanced as the amount of Ni increases, but if it exceeds 3096, the effect becomes saturated and becomes economically disadvantageous, so the upper limit is set at 30%.
Ａ１・０．５〜５，０％
Ａ１は、耐酸化性の向上に有効であると同時に、耐浸炭
性の向上にも非常に有効な元素である。A1・0.5-5.0% A1 is an element that is effective in improving oxidation resistance and at the same time is very effective in improving carburization resistance.
１１００℃以上の高温での使用における耐浸炭性の向上
を図るには、少なくとも０．５％以上含有する必要があ
る。その含有量の増加と共に耐浸炭性は改善されるが、
余りに多く含有すると鋳造時及び使用凌の靭性を著しく
低下させるため、５，０％を上限とする。In order to improve carburization resistance when used at high temperatures of 1100°C or higher, it is necessary to contain at least 0.5% or more. The carburization resistance improves with the increase of its content, but
If the content is too large, the toughness during casting and during use will be significantly reduced, so the upper limit is set at 5.0%.
本発明の耐熱鋳鋼は、更にＮｂ、Ｗの一種又は二種を下
記のとおり含有している。The heat-resistant cast steel of the present invention further contains one or two of Nb and W as described below.
Ｎｂ：０．２〜２．０２≦
Ｎｂは、クリープ破断強度の向上及び高温におけるクリ
ープ変形の向上に寄与する。Ｎｂを添加する場き、含有
量が０．２％よりも少ないとその効果が十分でなく、一
方２．０％を超えるとクリープ破断強度及び耐酸化性が
劣化する９従って、０．２〜２０％に規定する。Nb: 0.2 to 2.02≦ Nb contributes to improving creep rupture strength and creep deformation at high temperatures. When adding Nb, if the content is less than 0.2%, the effect will not be sufficient, while if it exceeds 2.0%, the creep rupture strength and oxidation resistance will deteriorate9. Specified at 20%.
Ｗ：０２〜２．０％
Ｗも、Ｎｂと同様、クリープ破断強度の向上及び高温に
おけるクリープ変形の向上に寄与する。W: 02-2.0% Like Nb, W also contributes to improving creep rupture strength and creep deformation at high temperatures.
Ｗを添加する場合、含有量が０２％より少ないとその効
果が十分でなく、一方２．０％を超えるとクリープ破断
強度度及びｉｆｆ酸化性に悪影響を及ぼす、従って、０
２〜２０％に規定する。When adding W, if the content is less than 0.2%, the effect will not be sufficient, while if it exceeds 2.0%, it will have a negative effect on creep rupture strength and IF oxidation.
It is specified at 2 to 20%.
本発明の耐熱鋳鋼は、上記の成分元素を含有し、残部は
実質的にＦｅから成る。なお、合金の溶製時に不可避的
に混入するＰ、Ｓ等の不純物であっても、この種の鋼材
に通常許容される範囲内であれば存在しても構わない。The heat-resistant cast steel of the present invention contains the above-mentioned component elements, and the remainder essentially consists of Fe. Note that even impurities such as P and S that are inevitably mixed in during melting of the alloy may be present as long as they are within the range normally allowed for this type of steel material.
次に実施例を挙げて本発明の耐熱鋳鋼の耐浸炭性の向上
効果を具体的に説明する。Next, the effect of improving the carburization resistance of the heat-resistant cast steel of the present invention will be specifically explained with reference to Examples.
（実施例）
高周波誘導溶解炉で各種成分の合金な溶製し、遠心鋳造
にて管（外径１００ｍｍＸ内径８０１×長さ６０１Ｍｌ
１１）を製造した。各供試管の合金成分組成を第１表に
示す。これらについて浸炭試験を行ない、第１図にその
結果を示す。(Example) An alloy of various components was melted in a high frequency induction melting furnace, and a tube (outer diameter 100 mm x inner diameter 801 x length 601 ml) was centrifugally cast.
11) was produced. Table 1 shows the alloy composition of each test tube. Carburization tests were conducted on these, and the results are shown in Figure 1.
浸炭試験は、供試管を固体浸炭４１（テグサＫ Ｇ３０
、ＢａＣＯ３含有）中、温度１１５０℃で１０００時間
保持後の浸炭量を測定することにより行なった。In the carburizing test, the test tube was solid carburized 41 (Tegusa K G30
, containing BaCO3) at a temperature of 1150° C. for 1000 hours and then measuring the amount of carburization.
（以下余白）
前記第１表において、供試管Ｎｏ、１及びＮｏ、２は本
発明の耐熱鋳鋼、Ｎｏ、３は従来のＨＰ改良材である。(Left space below) In Table 1, test tubes No. 1 and No. 2 are heat-resistant cast steel of the present invention, and No. 3 is a conventional HP improving material.
第１１ｍから明らかなごとく、供試管Ｎｏ。As is clear from the 11th meter, the test tube No.
３のＣ増加量は本発明の耐熱鋳鋼を用いた供試管Ｎｏ、
ｌ及びＮｏ、２に比べてＣの増加量は極めて多い。本発
明の耐熱鋳鋼を用いた供試管Ｎｏ、１及びＮｏ、２の浸
炭量は管の表面においても約１．０％程度と極めて軽微
であり、耐浸炭性が極めて良好であることを示している
。The increase in C in No. 3 is for test tube No. 3 using the heat-resistant cast steel of the present invention.
The amount of increase in C is extremely large compared to No. 1, No. 2, and No. 2. The amount of carburization of test tubes No. 1 and No. 2 using the heat-resistant cast steel of the present invention was extremely slight at about 1.0% even on the tube surface, indicating that the carburization resistance was extremely good. There is.
（発明の効県）
本発明の耐熱鋳鋼は、１１００℃を超える高温域におけ
る使用においてすぐれた耐浸炭性を鍋えている。従って
、本発明の耐熱鋳鋼は、石油化学工業におけるクラッキ
ングチューブやリフオーミングチューブの材相として、
更には浸炭熱処理炉の炉内部品材ｔ１としても好適であ
る。(Effects of the Invention) The heat-resistant cast steel of the present invention has excellent carburization resistance when used in a high temperature range exceeding 1100°C. Therefore, the heat-resistant cast steel of the present invention can be used as a material for cracking tubes and reforming tubes in the petrochemical industry.
Furthermore, it is suitable as a furnace component material t1 of a carburizing heat treatment furnace.
第１図は供試管内部への浸炭によるＣの増加量を示すグ
ラフである。
管壁面からのＹ巨脇FIG. 1 is a graph showing the amount of increase in C due to carburization inside the test tube. Y side from the pipe wall surface
Claims (1)
５％、Ｍｎ：５〜１０％、Ｃｒ：２３〜３０％、Ｎｉ：
５〜３０％、Ａｌ：０．５〜５．０％を含有すると共に
、Ｎｂ：０．２・〜２．０％及び／又はＷ：０．２〜２
．０％を含有し、残部実質的にＦｅから成る耐浸炭性に
すぐれる耐熱鋳鋼。(1) In weight%, C: 0.3~0.7%, Si: 3~
5%, Mn: 5-10%, Cr: 23-30%, Ni:
5-30%, Al: 0.5-5.0%, Nb: 0.2-2.0% and/or W: 0.2-2
．． A heat-resistant cast steel with excellent carburization resistance, containing 0% Fe and the remainder substantially consisting of Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12887088A JPH01298136A (en) | 1988-05-26 | 1988-05-26 | Heat-resistant cast steel having excellent carburization resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12887088A JPH01298136A (en) | 1988-05-26 | 1988-05-26 | Heat-resistant cast steel having excellent carburization resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01298136A true JPH01298136A (en) | 1989-12-01 |
Family
ID=14995399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12887088A Pending JPH01298136A (en) | 1988-05-26 | 1988-05-26 | Heat-resistant cast steel having excellent carburization resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01298136A (en) |
-
1988
- 1988-05-26 JP JP12887088A patent/JPH01298136A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6344814B2 (en) | ||
| JPH04358037A (en) | Nickel-base heat resisting alloy | |
| US4119456A (en) | High-strength cast heat-resistant alloy | |
| JP3895089B2 (en) | Heat resistant alloy with excellent carburization and metal dusting resistance | |
| JPH01152245A (en) | Heat-resistant alloy having excellent carburizing resistance | |
| JPS61177352A (en) | Heat resistant cast steel having superior elongation characteristic at room temperature | |
| JPH01298136A (en) | Heat-resistant cast steel having excellent carburization resistance | |
| US5866068A (en) | Heat-resistant alloy | |
| JPS5864359A (en) | Heat resistant cast steel | |
| JPH0627306B2 (en) | Heat resistant steel for ethylene cracking furnace tubes | |
| JPH051344A (en) | Heat resisting steel for ethylene cracking furnace tube excellent in coking resistance | |
| JPH02115351A (en) | Heat resisting steel excellent in carburizing resistance | |
| JPH02122050A (en) | Heat resisting steel excellent in carburizing resistance | |
| JPS596910B2 (en) | heat resistant cast steel | |
| JPS5919985B2 (en) | Heat resistant casting alloy | |
| JPH01152246A (en) | Two-layer centrifugal cast tube | |
| JPH02122051A (en) | Heat resisting steel excellent in carburizing resistance | |
| JPH03232948A (en) | Heat-resistant steel excellent in carburizing resistance | |
| JPH01298137A (en) | Heat-resistant cast steel having excellent carburization resistance | |
| JPS5935984B2 (en) | heat resistant cast steel | |
| JPH046242A (en) | Heat-resistant cast steel | |
| JPS5935426B2 (en) | heat resistant cast steel | |
| JPS5864360A (en) | Heat resistant cast steel | |
| GB2051125A (en) | Austenitic Stainless Cast Steel for High-temperature Use | |
| JPS6059051A (en) | Heat-resistant cast steel material with carburization resistance |