JPS6156307B2 - - Google Patents
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- Publication number
- JPS6156307B2 JPS6156307B2 JP14164881A JP14164881A JPS6156307B2 JP S6156307 B2 JPS6156307 B2 JP S6156307B2 JP 14164881 A JP14164881 A JP 14164881A JP 14164881 A JP14164881 A JP 14164881A JP S6156307 B2 JPS6156307 B2 JP S6156307B2
- Authority
- JP
- Japan
- Prior art keywords
- thermal shock
- temperature
- steel
- heat
- 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.)
- Expired
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- 230000003647 oxidation Effects 0.000 claims description 28
- 238000007254 oxidation reaction Methods 0.000 claims description 28
- 230000035939 shock Effects 0.000 claims description 26
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 239000003779 heat-resistant material Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910020515 Co—W Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910018107 Ni—Ca Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
本発明は、加熱炉等で1000〜1300℃の高温下で
使用されるNi−Cr−Co系耐熱鋳鋼の改良に関す
る。
例えば加熱炉のスキツド、スライダー等に使用
されるいわゆる耐熱材料はその使用条件から、
耐熱衝撃性がすぐれていること 高温強度がす
ぐれていること 高温耐酸化性がすぐれている
ことの３つの特性を具えていることが要求され
る。
即ちは熱衝撃に対する抵抗性が強いことで具
体的には、使用に際して高温加熱、急冷の繰返し
という熱衝撃を受けて膨張、収縮を反復してもヒ
ビ割れの発生が少ないこと。は長期間高温下に
曝され、かつ機械的応力を受けても変形をしない
ような高温硬度を維持すること。は長期間高温
下の酸化性雰囲気に曝されても酸化による減量が
少いことである。
耐熱材料には其他高温耐蝕性、高温靭性、耐浸
炭性等が要求される場合があるが、熱処理炉にお
ける耐熱材料では耐熱衝撃性が最も重要である。
即ち加熱炉等では使用中に受ける熱衝撃によつて
第１図に示すように、クラツク（ヒビ割れ）を生
じて廃却される場合が多く、材料の使用寿命に最
も影響を及ぼす。次に高温における酸化減量の少
いことが、使用寿命延長のために重要である。
従来加熱炉用の耐熱材料としては50％Co−28
％、Cr−残Feのコバルト基合金（UMCO50）が
あり、以下に示す成分組成範囲の耐熱合金であ
る。
The present invention relates to improvement of Ni-Cr-Co heat-resistant cast steel used at high temperatures of 1000 to 1300°C in heating furnaces and the like. For example, so-called heat-resistant materials used for heating furnace skids, sliders, etc., due to their usage conditions,
It is required to have three properties: excellent thermal shock resistance, excellent high-temperature strength, and excellent high-temperature oxidation resistance. In other words, it has strong resistance to thermal shock, and more specifically, it does not crack easily even if it undergoes repeated expansion and contraction due to repeated thermal shocks such as high-temperature heating and rapid cooling during use. must maintain high-temperature hardness that will not deform even if exposed to high temperatures for long periods of time and subjected to mechanical stress. This means that the weight loss due to oxidation is small even when exposed to an oxidizing atmosphere at high temperatures for a long period of time. Heat-resistant materials may also be required to have high-temperature corrosion resistance, high-temperature toughness, carburization resistance, etc., but thermal shock resistance is most important for heat-resistant materials used in heat treatment furnaces.
That is, heating furnaces and the like often develop cracks as shown in FIG. 1 due to thermal shock during use and are discarded, which has the greatest effect on the service life of the material. Next, low oxidation loss at high temperatures is important for extending service life. 50% Co-28 is the conventional heat-resistant material for heating furnaces.
%, Cr-remaining Fe cobalt-based alloy (UMCO50), which is a heat-resistant alloy with the composition range shown below.
【表】
しかしこの様なCo基合金は、後述する比較試
験No.7のデーターが示すように、高温硬度では
ある程度優れているが、耐熱衝撃性と高温耐酸化
性は劣つており、かつ高価な原料であるコバルト
を50％前后も添加するため極めて高価格となるこ
と、特に加熱炉の使用中鋼材の抽出時に大気の炉
内流入に伴う急冷、高温鋼材による加熱の繰返し
を受けるので長期の使用に耐え得ない。
また本発明と類似したNi−Cr−CoW系耐熱合
金として次に示す成分組成範囲のものがある。[Table] However, as shown by the data of Comparative Test No. 7 described later, although these Co-based alloys are superior in high-temperature hardness to some extent, they are inferior in thermal shock resistance and high-temperature oxidation resistance, and are expensive. The cost is extremely high because 50% of the raw material cobalt is added, and especially when the steel is extracted during the use of the heating furnace, it undergoes repeated rapid cooling as air flows into the furnace and heating by high-temperature steel, resulting in long-term costs. It cannot withstand use. Further, there are Ni-Cr-CoW heat-resistant alloys similar to the present invention having the following composition ranges.
【表】
これは後述する比較試験データーNo.10に示す
ように、酸化減量が少く、特に優れた高温強度を
示し価格も前記のCo基合金より安価であるが、
耐熱衝撃性が非常に劣り、加熱炉において使用中
に多数のクラツクが発生することは明らかで長期
の使用には堪えられない。
またMi−Cr−Co−Ｗ系耐熱合金としてCoを17
％前后、Ｗを５〜６％含むものがあるが、後述す
る比較試験データNo.8に示すように、高温強度
は極めて優れているが、高温耐酸化性と耐熱衝撃
性がともに劣悪であるから加熱炉の如く酸化性雰
囲気で急熱急冷される用途には使用できない。
本発明は従来の耐熱材料の高温強度を損うこと
なく、特に耐熱衝撃性および高温耐酸化性に優
れ、加熱炉スキツド等の用途に適した耐熱鋳鋼を
提供することを目的とし、その要旨は成分組成範
囲が重量％で、C0.2〜0.7、Si0.5〜2.0、Mn0.5〜
2.0、Cr25〜30、Ni32〜37、Co2〜７、W0.2〜
2.0、Ca0.001〜0.05で、残部がFeおよび不可避の
不純物からなる耐熱衝撃性と高温耐酸化性にすぐ
れた耐熱鋳鋼である。
以下上記各成分の添加理由ならびにその組成範
囲について第１表「本発明鋼と比較鋼の成分組
成」、第２表「本発明鋼と比較鋼の試験結果」に
基づいて説明する。[Table] As shown in Comparative Test Data No. 10, which will be described later, this alloy has low oxidation loss, particularly excellent high-temperature strength, and is cheaper than the Co-based alloy mentioned above.
It is obvious that the thermal shock resistance is very poor and many cracks occur during use in a heating furnace, making it unendurable for long-term use. In addition, Co17 is used as a Mi-Cr-Co-W heat-resistant alloy.
%, some contain 5 to 6% W, but as shown in Comparative Test Data No. 8 mentioned below, they have extremely good high-temperature strength, but both high-temperature oxidation resistance and thermal shock resistance are poor. Therefore, it cannot be used in applications where it is rapidly heated and cooled in an oxidizing atmosphere, such as in a heating furnace. The purpose of the present invention is to provide a heat-resistant cast steel that has particularly excellent thermal shock resistance and high-temperature oxidation resistance without impairing the high-temperature strength of conventional heat-resistant materials, and is suitable for applications such as heating furnace skids. The composition range is by weight%, C0.2~0.7, Si0.5~2.0, Mn0.5~
2.0, Cr25~30, Ni32~37, Co2~7, W0.2~
It is a heat-resistant cast steel with excellent thermal shock resistance and high-temperature oxidation resistance, with a Ca content of 0.001 to 0.05 and the balance being Fe and unavoidable impurities. The reasons for adding each of the above components and their composition ranges will be explained below based on Table 1 "Composition of Inventive Steel and Comparative Steel" and Table 2 "Test Results of Inventive Steel and Comparative Steel".
【表】【table】
【表】
先ずＣは、一般にNi−Cr系耐熱鋳鋼には高温
強度を付与するために0.1〜0.9％含有せしめる
が、0.2％以下では第１表、第２表の比較鋼No.17
に示すように、他の成分がこの発明の成分組成範
囲にあつても高温強度が急激に低下する。またＣ
の含有が0.7％を越すとCr結合して炭化物を多量
に晶出してマトリツクスのCr濃度を下げるの
で、同じくNo.15およびNo.16に示すように高温
耐酸化性に劣り、さらに高温特に1200℃における
硬度は急激に低下することが明らかとなつた。従
つてＣの含有量は下限は0.2％が必要であり、上
限を0.7％とした。
次にSiについては、溶湯の流動性を増加させま
た高温耐酸化性の向上に寄与するのでその下限と
しては0.5％が必要であるが、２％以上添加して
もその増量効果は少く、逆に耐熱衝撃性を悪化さ
せる傾向があるので上限を2.0％とした。
Mnについてもその少量添加は高温強度を向上
させるのに有効であるが0.5％以下の少量添加で
はほとんど寄与しないので下限は0.5％とし、ま
た2.0％を越すと高温耐酸化性を悪化させるので
その添加量を0.5〜2.0％とした。
Crについては、Ni−Cr−Co系耐熱材料におい
て、高温耐酸化性を付与するため通常20数％添加
されているが、25％以下の添加量では比較鋼
No.8、No.9の如く高温耐酸化性が低下する傾向
があり、また30％以上添加しても高温耐酸化性の
向上に効果はないので、下限25％、下限30％とし
た。
次にNiは、Fe−Ni−Cr系耐熱合金において28
％、Cr−35％Ni付近が高温耐酸化性が良好でか
つ高温強度が高いのでJIS耐熱鋼鋳鋼品SCH24と
しても使われており、そのNi含有量は33〜37％
である。よつて本発明では不限を32％、上限を37
％とした。
CoはFe−Ni−Cr系耐熱合金において８〜17％
の添加が高温強度を向上させ、さらに耐熱衝撃性
にも同時に好影響を与えるのは10〜15％付近であ
ることは比較鋼No.9、18、19で示されるが最近
のコバルト価格の急騰のためこの含有率を下げる
ことを検討した結果、Ｗの添加を少量におさえ、
さらにCaを添加すれば、Coの含有量が７％以下
になつても、高温強度は多少低下するが耐熱衝撃
性は低下しないことが明らかになつた。従つて
Coの含有は２〜７％でこの発明の目的を充分達
成し得る。
Ｗの添加量は３％を越すと、Caの存在におい
ても高温耐酸化性が悪化することは比較鋼の実験
No.9、No.11、No.12により明らかであり、本発
明鋼の実験結果、ＷはCaの存在下で0.5〜1.8、％
程度が高温耐酸化性（酸化減量）が12.0〜13.9
mg/cm2と最良の結果となつた。またＷを添加しな
い場合は、比較鋼No.14で示すように、高温強度
を悪化させるので下限を0.2％、上限を2.0％とし
た。またＷとCaを添加しない場合は、他の成分
がこの発明鋼を満足していても、耐熱衝撃性が極
端に低下することが比較鋼No.13によつて証明さ
れた。
Caの添加はこの発明の最も特徴とするもの
で、合金中の最終含有量としては0.001〜0.05％
によつて、鋳鋼の耐熱衝撃性および高温耐酸化性
を著しく向上させる。なおCaは鋳造工程におい
てNi−Ca合金としてCa換算約0.25％添加される
が、大部分はノロ中に移行し製品鋳鋼中にCaと
して微量残留するものであるが、その鋳造過程に
おける挙動、組織中の状態等不明確な点がある
が、試験データー第１表、第２表においてCaを
添加したもの14品種内、No.15、No.16を除いて
その耐熱衝撃性は何れも最上位である。No.15と
No.16はＣの添加0.8％前后で過量であることによ
る。
反面Caを添加しながら鋼種５品種（No.6、
７、８、10、13）は何れも耐熱性は最下位にあ
る。直接的には、この発明鋼からCaを除いた比
較鋼No.10の耐熱衝撃性が劣悪であるようにCa添
加による耐熱衝撃性改善効果は明瞭である。
また高温耐酸化性については、Caを添加した
鋼種は、Ｗの多量添加によつて酸化減量の多い
No.9、No.11、No.12およびＣの過量添加による
ものNo.15、No.16を除いて、何れも高温耐酸化
性において最も優位にある。反面Caを含有せし
めないものは高温耐酸化性に劣る。
次に本発明鋼の高温強度は特に優れているとは
云えないが、加熱炉用としては充分に長期使用に
堪えることが試験の結果証明された。
なお、耐熱衝撃性、高温耐酸化性および高温強
度は次のような方法で測定した。
耐熱衝撃性：
第１表の各試験体から第２図に示すような試験
片を製作し、この試験片を1200℃の炉内で15分間
保持したのち水で急冷することを１サイクルと
し、72サイクル繰返した後試験片の任意の中心線
で縦方向に切断する。
金属顕微鏡で判別し得る亀裂の数を「割れ
数」、発生した亀裂の切断面における長さの総延
長を「割れ深さの合計」としてmmで表示し、識別
した亀裂の内最も長いものを「最大割れ深さ」と
してmmで表示する。
高温耐酸化性：
各試験から直経20mm×厚さ10mmの試験片を製作
し、これを1300℃の酸化性雰囲気炉中で連続100
時間保持した後、加熱前后の試験片の重量を測定
する。即ち加熱減量を「酸化減量」としてmg/cm2
で表示する。
高温強度：
各試験体から直経10mm×厚さ５mmの試験片を製
作し、アルゴンガス中で加熱し、各1000℃、1100
℃、1200℃における熱間硬度を高温硬度計で測定
し、「高温硬度」として単位Hvで表示する。
以上詳述したように、本発明鋼は従来のNi−
Cr−Co−Ｗ系耐熱鋳鋼の各構成成分の組成範囲
を限定し、特にCoとＷを減少しCaを添加するこ
とによつて耐熱衝撃性と高温耐酸化性に特に優
れ、かつ経済的に製造し得る耐熱鋳鋼を提供する
もので、スラブ加熱炉のスキツドレール、スライ
ダー等酸化性雰囲気で急熱急冷の熱衝撃と機械的
衝撃を受ける用途において長期間の使用に耐える
ことが認められる。[Table] First, Ni-Cr heat-resistant cast steel generally contains 0.1 to 0.9% C to impart high-temperature strength, but if it is less than 0.2%, the comparative steel No. 17 in Tables 1 and 2
As shown in FIG. 2, even if the other components are within the composition range of the present invention, the high-temperature strength decreases rapidly. Also C
If the content exceeds 0.7%, Cr bonds and a large amount of carbide crystallizes, lowering the Cr concentration in the matrix, resulting in poor high-temperature oxidation resistance, as shown in Nos. 15 and 16. It has become clear that the hardness at ℃ decreases rapidly. Therefore, the lower limit of the C content is required to be 0.2%, and the upper limit is set to 0.7%. Next, regarding Si, it increases the fluidity of the molten metal and contributes to improving high-temperature oxidation resistance, so the lower limit of Si is required to be 0.5%, but even if it is added more than 2%, the increase effect is small, and vice versa. Since this tends to worsen thermal shock resistance, the upper limit was set at 2.0%. Regarding Mn, addition of a small amount is effective in improving high-temperature strength, but addition of a small amount of less than 0.5% makes almost no contribution, so the lower limit is set at 0.5%, and if it exceeds 2.0%, high-temperature oxidation resistance deteriorates, so The amount added was 0.5 to 2.0%. Regarding Cr, in Ni-Cr-Co heat-resistant materials, 20% or more is usually added to provide high-temperature oxidation resistance, but when the amount is less than 25%, comparative steel
As in No. 8 and No. 9, the high temperature oxidation resistance tends to decrease, and even if added in an amount of 30% or more, there is no effect on improving the high temperature oxidation resistance, so the lower limit was set at 25% and the lower limit was 30%. Next, Ni is 28
%, Cr-35% Ni has good high-temperature oxidation resistance and high high-temperature strength, so it is also used as JIS heat-resistant steel casting product SCH24, and its Ni content is 33 to 37%.
It is. Therefore, in the present invention, the limit is 32% and the upper limit is 37%.
%. Co is 8 to 17% in Fe-Ni-Cr heat-resistant alloy
Comparative steels No. 9, 18, and 19 show that the addition of cobalt improves high-temperature strength and also has a positive effect on thermal shock resistance at around 10-15%, but the recent sharp rise in the price of cobalt Therefore, as a result of considering lowering this content, we suppressed the addition of W to a small amount, and
Furthermore, it has been revealed that when Ca is added, even if the Co content becomes 7% or less, the high temperature strength decreases somewhat, but the thermal shock resistance does not decrease. accordingly
The purpose of this invention can be fully achieved with a Co content of 2 to 7%. Experiments on comparative steels have shown that when the amount of W added exceeds 3%, high-temperature oxidation resistance deteriorates even in the presence of Ca.
This is clear from No. 9, No. 11, and No. 12, and the experimental results for the steel of the present invention show that W is 0.5 to 1.8% in the presence of Ca.
The degree of high temperature oxidation resistance (oxidation loss) is 12.0 to 13.9
The best result was mg/cm 2 . Furthermore, when W is not added, as shown in Comparative Steel No. 14, the high temperature strength deteriorates, so the lower limit was set to 0.2% and the upper limit to 2.0%. Furthermore, Comparative Steel No. 13 proved that when W and Ca are not added, the thermal shock resistance is extremely reduced even if the other components satisfy the requirements of the invention steel. The addition of Ca is the most characteristic feature of this invention, and the final content in the alloy is 0.001 to 0.05%.
This significantly improves the thermal shock resistance and high-temperature oxidation resistance of cast steel. In addition, Ca is added in the form of Ni-Ca alloy in the casting process at a concentration of approximately 0.25% (Calculated as Ca), but most of it migrates into the slag and remains in the product cast steel in small amounts as Ca, but its behavior and structure during the casting process are Although there are some unclear points such as the condition of the inside, the test data in Tables 1 and 2 shows that among the 14 types that added Ca, all of them had the highest thermal shock resistance except for No. 15 and No. 16. It is. No.15 and
No. 16 was due to an excessive amount of C added after 0.8%. On the other hand, five steel types (No. 6,
7, 8, 10, and 13) are all at the lowest level of heat resistance. Directly, the effect of improving thermal shock resistance by adding Ca is clear, as the thermal shock resistance of Comparative Steel No. 10, which is obtained by removing Ca from this invention steel, is poor. Regarding high-temperature oxidation resistance, steel types with Ca added have a large amount of oxidation loss due to the addition of a large amount of W.
Except for No. 9, No. 11, No. 12, and No. 15 and No. 16, which were caused by excessive addition of C, all of them were the most superior in high-temperature oxidation resistance. On the other hand, those that do not contain Ca have poor high-temperature oxidation resistance. Next, although it cannot be said that the high-temperature strength of the steel of the present invention is particularly excellent, test results have shown that it can withstand long-term use as a heating furnace. Note that thermal shock resistance, high temperature oxidation resistance, and high temperature strength were measured by the following methods. Thermal shock resistance: A test piece as shown in Figure 2 was prepared from each test piece in Table 1, and one cycle consisted of holding this test piece in a furnace at 1200°C for 15 minutes and then rapidly cooling it with water. After repeating 72 cycles, cut the specimen lengthwise at any center line. The number of cracks that can be identified with a metallurgical microscope is expressed as the "number of cracks," and the total length of the cracks that have occurred at the cut surface is expressed in mm as the "total crack depth."The longest crack among the identified cracks is Displayed as "maximum crack depth" in mm. High-temperature oxidation resistance: A test piece measuring 20 mm in diameter x 10 mm in thickness was prepared from each test, and this was continuously heated for 100 times in an oxidizing atmosphere furnace at 1300°C.
After holding for a period of time, the weight of the test piece before and after heating is measured. In other words, the loss on heating is defined as the "loss by oxidation" in mg/cm 2
Display in . High-temperature strength: A test piece with a diameter of 10 mm and a thickness of 5 mm was prepared from each test specimen, heated in argon gas, and heated at 1000°C and 1100°C.
The hot hardness at 1200°C and 1200°C is measured using a high-temperature hardness meter, and is expressed as "high-temperature hardness" in units of Hv. As detailed above, the steel of the present invention is
By limiting the composition range of each component of the Cr-Co-W heat-resistant cast steel, and by reducing Co and W in particular and adding Ca, we have achieved particularly excellent thermal shock resistance and high-temperature oxidation resistance, as well as economically. This product provides heat-resistant cast steel that can be manufactured and is recognized to withstand long-term use in applications that are subject to thermal shock and mechanical shock due to rapid heating and cooling in an oxidizing atmosphere, such as skid rails and sliders in slab heating furnaces.
第１図は、耐熱材料が熱衝撃によつてクラツク
を発生した状態を示す斜視図であり、第２図は耐
熱衝撃性の試験片の形状および方法を示す平面図
である。
FIG. 1 is a perspective view showing a state in which a heat-resistant material has cracked due to thermal shock, and FIG. 2 is a plan view showing the shape and method of a thermal shock-resistant test piece.
Claims (1)
2.0、Mn0.5〜2.0、Cr25〜30、Ni32〜37、Co2〜
７、W0.2〜2.0、Ca0.001〜0.05で、残部がFeお
よび不可避の不純物からなる耐熱衝撃性と高温耐
酸化性にすぐれた耐熱鋳鋼。1 Component composition range is C0.2~0.7, Si0.5~ in weight%
2.0, Mn0.5~2.0, Cr25~30, Ni32~37, Co2~
7. Heat-resistant cast steel with excellent thermal shock resistance and high-temperature oxidation resistance, consisting of W0.2-2.0, Ca0.001-0.05, the balance being Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14164881A JPS5845362A (en) | 1981-09-10 | 1981-09-10 | Heat resistant cast steel with superior thermal impact resistance and superior oxidation resistance at high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14164881A JPS5845362A (en) | 1981-09-10 | 1981-09-10 | Heat resistant cast steel with superior thermal impact resistance and superior oxidation resistance at high temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5845362A JPS5845362A (en) | 1983-03-16 |
| JPS6156307B2 true JPS6156307B2 (en) | 1986-12-02 |
Family
ID=15296927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14164881A Granted JPS5845362A (en) | 1981-09-10 | 1981-09-10 | Heat resistant cast steel with superior thermal impact resistance and superior oxidation resistance at high temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5845362A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6189189A (en) * | 1984-10-05 | 1986-05-07 | ヤマハ発動機株式会社 | Supporter for rear wheel of motorcycle |
-
1981
- 1981-09-10 JP JP14164881A patent/JPS5845362A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5845362A (en) | 1983-03-16 |
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