JPH11286740A - Production of alloy cast iron with high toughness - Google Patents
Production of alloy cast iron with high toughnessInfo
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- JPH11286740A JPH11286740A JP10707998A JP10707998A JPH11286740A JP H11286740 A JPH11286740 A JP H11286740A JP 10707998 A JP10707998 A JP 10707998A JP 10707998 A JP10707998 A JP 10707998A JP H11286740 A JPH11286740 A JP H11286740A
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- cast iron
- impact value
- alloy cast
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、破砕機用耐衝撃摩
耗材料や粉砕機用耐摩耗材料として使用される高靱性合
金鋳鉄及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high toughness alloy cast iron used as an impact-resistant material for a crusher and a wear-resistant material for a crusher, and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、破砕機用耐衝撃摩耗材料や粉砕機
用耐摩耗材料としては、高クロム鋳鉄（Ａ５３２（ＡＳ
ＴＭ））、ニハード鋳鉄、高マンガン鋳鋼（Ｇ５１３１
（ＪＩＳ），Ａ１２８（ＡＳＴＭ））又は低合金鋳鋼
（Ｇ５１１１（ＪＩＳ））等が使用されている。2. Description of the Related Art Conventionally, high-chromium cast iron (A532 (AS)
TM)), Ni-hard cast iron, high manganese cast steel (G5131)
(JIS), A128 (ASTM)) or low alloy cast steel (G5111 (JIS)) or the like is used.
【０００３】[0003]
【発明が解決しようとする課題】しかし、高クロム鋳鉄
やニハード鋳鉄では靱性が低く（高クロム鋳鉄：焼なら
し（空気焼入れ）、硬さＨＲＣ５５〜６５、衝撃値２〜
４Ｊ／ｃｍ2 （ノッチレス）、ニハード鋳鉄：硬さＨＲ
Ｃ６０〜６３、衝撃値１〜３Ｊ／ｃｍ2 ）、使用中に割
れることがある。一方、高マンガン鋳鋼や低合金鋳鋼で
は靱性が高いため（高マンガン鋳鋼：水靱処理（水焼入
れ）、硬さＨＲＣ２０（加工硬化後ＨＲＣ５０〜５
５）、衝撃値５０〜２００Ｊ／ｃｍ2 （Ｖノッチ）、低
合金鋳鋼：油焼入れ、焼戻し、硬さＨＲＣ４５〜５５、
衝撃値７〜３０Ｊ／ｃｍ2 （Ｕノッチ））、割れること
はないが耐用寿命が短い不具合がある。そこで、本発明
は、衝撃値が高クロム鋳鉄、ニハード鋳鉄より大きく、
硬さが高マンガン鋳鋼、低合金鋳鋼より高い高靱性合金
鋳鉄及びその製造方法を提供することを目的とする。However, high chromium cast iron or nihard cast iron has low toughness (high chromium cast iron: normalizing (air quenching), hardness HRC 55 to 65, impact value 2 to 2).
4J / cm 2 (notchless), Ni-hard cast iron: Hardness HR
C60-63, impact value 1-3 J / cm 2 ), and may crack during use. On the other hand, since high manganese cast steel and low alloy cast steel have high toughness (high manganese cast steel: water toughness treatment (water quenching), hardness HRC 20 (HRC 50 to 5 after work hardening)
5), impact value 50 to 200 J / cm 2 (V notch), low alloy cast steel: oil quenching, tempering, hardness HRC 45 to 55,
The impact value is 7 to 30 J / cm 2 (U notch)). Therefore, the present invention, the impact value is higher than high chromium cast iron, nihard cast iron,
An object of the present invention is to provide a high-toughness alloy cast iron having a hardness higher than that of a high-manganese cast steel or a low-alloy cast steel, and a method for producing the same.
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するた
め、本発明の高靱性合金鋳鉄は、Ｃ１．４〜２．２ｗｔ
％、Ｓｉ０．５〜１．５ｗｔ％、Ｍｎ０．５〜１．５ｗ
ｔ％、Ｃｒ２．５〜６．０ｗｔ％、Ｍｏ１．５〜８．０
ｗｔ％、Ｖ３．０〜６．０ｗｔ％、Ｃｏ０〜５．５ｗｔ
％及び残部がＦｅと不可避不純物からなり、硬さＨＲＣ
６２以上、衝撃値５．０Ｊ／ｃｍ2 以上であることを特
徴とする。一方、高靱性合金鋳鉄の製造方法は、Ｃ１．
４〜２．２ｗｔ％、Ｓｉ０．５〜１．５ｗｔ％、Ｍｎ
０．５〜１．５ｗｔ％、Ｃｒ２．５〜６．０ｗｔ％、Ｍ
ｏ１．５〜８．０ｗｔ％、Ｖ３．０〜６．０ｗｔ％、Ｃ
ｏ０〜５．５ｗｔ％及び残部がＦｅと不可避不純物から
なる合金鋳鉄を９００〜１１００℃の温度で加熱した後
衝風冷却し、しかる後に４５０〜５５０℃の温度で焼戻
し処理することを特徴とする。前記焼戻し処理は、２回
以上行うことが好ましい。In order to solve the above-mentioned problems, a high toughness alloy cast iron of the present invention has a C 1.4 to 2.2 wt.
%, Si 0.5-1.5 wt%, Mn 0.5-1.5 w
t%, Cr 2.5-6.0 wt%, Mo1.5-8.0
wt%, V3.0-6.0wt%, Co0-5.5wt
% And the balance consist of Fe and unavoidable impurities, and have a hardness of HRC.
It is characterized by having an impact value of at least 62 and an impact value of at least 5.0 J / cm 2 . On the other hand, the production method of the high toughness alloy cast iron is C1.
4-2.2 wt%, Si 0.5-1.5 wt%, Mn
0.5 to 1.5 wt%, Cr 2.5 to 6.0 wt%, M
o1.5-8.0 wt%, V3.0-6.0 wt%, C
It is characterized in that an alloy cast iron comprising 0 to 5.5 wt% and the balance of Fe and unavoidable impurities is heated at a temperature of 900 to 1100 ° C., then cooled by impingement, and then tempered at a temperature of 450 to 550 ° C. . It is preferable that the tempering process is performed twice or more.
【０００５】Ｃ（カーボン）は、Ｃｒ（クロム）、Ｍｏ
（モリブデン）、Ｖ（バナジウム）と化合して各種の炭
化物を生成して硬さ（耐摩耗性）を高める。Ｃの含有量
が、１．４ｗｔ％未満であると、炭化物量が少なくなっ
て硬さが低下し、２．２ｗｔ％を超えると、靱性が低下
する。好ましい含有量は、１．７〜２．０ｗｔ％であ
る。C (carbon) is composed of Cr (chromium), Mo
(Molybdenum) and V (vanadium) combine to form various carbides to increase hardness (wear resistance). If the content of C is less than 1.4 wt%, the amount of carbides will decrease and the hardness will decrease, and if it exceeds 2.2 wt%, the toughness will decrease. The preferred content is 1.7 to 2.0 wt%.
【０００６】Ｓｉ（シリコン）は、溶湯の脱酸に寄与す
ると共に、湯流れを良くして鋳造性を良好にする。Ｓｉ
の含有量が、０．５ｗｔ％未満であると、上述した機能
が果たされず、１．５ｗｔ％を超えると、材質の脆化を
招く。好ましい含有量は、０．７〜１．３ｗｔ％であ
る。[0006] Si (silicon) contributes to the deoxidation of the molten metal and improves the flow of the molten metal to improve the castability. Si
If the content of is less than 0.5 wt%, the above-mentioned functions cannot be performed, and if it exceeds 1.5 wt%, the material becomes brittle. The preferred content is 0.7 to 1.3 wt%.
【０００７】Ｍｎ（マンガン）は、溶湯の脱酸と脱硫に
寄与し、又、焼入性と耐摩耗性に寄与する。Ｍｎの含有
量が、０．５ｗｔ％未満であると、上述した機能が果た
されず、１．５ｗｔ％を超えると、焼割れを招く。好ま
しい含有量は、０．７〜１．２ｗｔ％である。Mn (manganese) contributes to deoxidation and desulfurization of the molten metal, and also contributes to hardenability and wear resistance. If the content of Mn is less than 0.5 wt%, the above-mentioned function is not fulfilled, and if it exceeds 1.5 wt%, burning cracks are caused. The preferred content is 0.7 to 1.2 wt%.
【０００８】Ｃｒは、Ｃと化合して有能な炭化物を生成
すると共に、高温での耐酸化性を強め耐硫化性を改良す
る。Ｃｒの含有量が、２．５ｗｔ％未満であると、炭化
物量が少なくなって硬さが低下し、６．０ｗｔ％を超え
ると、靱性が低下する。好ましい含有量は、３．０〜
５．０ｗｔ％である。[0008] Cr combines with C to form a competent carbide, and at the same time, enhances oxidation resistance at high temperatures and improves sulfidation resistance. When the content of Cr is less than 2.5 wt%, the amount of carbide is reduced and the hardness is reduced, and when it exceeds 6.0 wt%, the toughness is reduced. The preferred content is 3.0 to
5.0 wt%.
【０００９】Ｍｏは、Ｃと化合して有能な炭化物を生成
すると共に、焼入性を高め、かつ、焼戻し脆化を防止す
る。Ｍｏの含有量が、１．５ｗｔ％未満であると、上述
した機能が果たされず、８．０ｗｔ％を超えると、靱性
が低下する。好ましい含有量は、６．０〜８．０ｗｔ％
である。Mo combines with C to form a competent carbide, enhances hardenability, and prevents tempering embrittlement. If the content of Mo is less than 1.5 wt%, the above-mentioned function is not fulfilled, and if it exceeds 8.0 wt%, the toughness is reduced. The preferred content is 6.0-8.0 wt%.
It is.
【００１０】Ｖは、炭化物生成能が大きく微粒炭化物を
生じ、組織を微細化し、硬さを高める。Ｖの含有量が、
３．０ｗｔ％未満であると、上述した機能が果たされ
ず、６．０ｗｔ％を超えると、上述した機能の飽和を招
く。好ましい含有量は、３．０〜５．０ｗｔ％である。[0010] V has a large carbide-forming ability to produce fine carbides, refine the structure, and increase the hardness. V content is
If the content is less than 3.0 wt%, the above-mentioned functions cannot be performed. If the content exceeds 6.0 wt%, the above-mentioned functions are saturated. The preferred content is 3.0 to 5.0 wt%.
【００１１】Ｃｏ（コバルト）は、高温強さを改良する
ために用いられる。Ｃｏの含有量が、５．５ｗｔ％を超
えると、上述した機能が飽和状態となる。好ましい含有
量は、０．５〜１．５ｗ％である。[0011] Co (cobalt) is used to improve high temperature strength. When the content of Co exceeds 5.5 wt%, the above-described functions are saturated. The preferred content is 0.5 to 1.5 w%.
【００１２】硬さが、ＨＲＣ６２未満であると、硬さが
高マンガン鋳鋼や低合金鋳鋼のそれと同等以下になり、
又、衝撃値が、５．０Ｊ／ｃｍ2 未満であると、高クロ
ム鋳鉄やニハード鋳鉄のそれと同等以下になる。When the hardness is less than HRC62, the hardness becomes equal to or lower than that of high manganese cast steel or low alloy cast steel,
When the impact value is less than 5.0 J / cm 2 , the impact value becomes equal to or less than that of high chromium cast iron or nihard cast iron.
【００１３】合金鋳鉄の加熱温度が、９００℃未満であ
ると、マトリックス中のＣ濃度の低下により硬さが低く
なり、１１００℃を超えると、残留γ量の増加により硬
さが低くなる。好ましい加熱温度は、９５０〜１１００
℃である。衝風冷却は、５〜３００℃／ｍｉｎの冷却速
度で行うことが好ましい。When the heating temperature of the alloy cast iron is lower than 900 ° C., the hardness becomes lower due to a decrease in the C concentration in the matrix, and when it exceeds 1100 ° C., the hardness becomes lower due to an increase in the amount of residual γ. Preferred heating temperatures are 950 to 1100
° C. The blast cooling is preferably performed at a cooling rate of 5 to 300 ° C./min.
【００１４】焼戻し処理温度が、４５０℃未満である
と、合金炭化物析出による二次硬化が起こらず、５５０
℃を超えると、硬さが低下する。好ましい処理温度は、
４８０〜５５０℃である。When the tempering temperature is lower than 450 ° C., secondary hardening due to precipitation of alloy carbide does not occur, and
If the temperature exceeds ℃, the hardness decreases. The preferred processing temperature is
480-550 ° C.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て具体的な実施例と比較例を参照して説明する。 実施例１〜１３、比較例１〜７ 先ず、Ｃ、Ｓｉ、Ｍｎ、Ｃｒ、Ｍｏ、Ｖ及びＣｏ（比較
例６は、他に０．１０ｗｔ％のＴｉ（チタン）、比較例
７は、他に０．０４ｗｔ％のＴｉを含有する）をそれぞ
れ表１に示す割合で含有し、残部がＦｅ（鉄）と不可避
不純物からなる各種の合金鋳鉄のテストピースを得た。
次に、各テストピースを１０００℃（比較例３は、１１
００℃）の温度で２〜２．５時間保持して加熱処理して
から５０〜１５０℃／ｍｉｎの冷却速度で衝風冷却する
空気焼入れ処理を施した後、５１０℃（比較例３は５５
０℃）の温度での焼戻し処理を２回（比較例３は、１
回）施したところ、それぞれの硬さ及び衝撃値は、表１
に示すようになった。Embodiments of the present invention will be described below with reference to specific examples and comparative examples. Examples 1 to 13 and Comparative Examples 1 to 7 First, C, Si, Mn, Cr, Mo, V and Co (Comparative Example 6 additionally includes 0.10 wt% of Ti (titanium), Comparative Example 7 includes other Containing 0.04 wt% of Ti) at the ratios shown in Table 1 and the balance being Fe (iron) and unavoidable impurities.
Next, each test piece was heated to 1000 ° C. (Comparative Example 3
(200 ° C.) for 2 to 2.5 hours, heat-treated, and then subjected to air quenching for blast cooling at a cooling rate of 50 to 150 ° C./min.
Tempering at a temperature of 0 ° C) twice (Comparative Example 3
Times), each hardness and impact value are shown in Table 1.
It became as shown in.
【００１６】[0016]
【表１】 [Table 1]
【００１７】又、Ｃの含有量と硬さの関係、Ｃの含有量
と衝撃値の関係、Ｃｒの含有量と硬さの関係、Ｃｒの含
有量と衝撃値の関係、Ｍｏの含有量と硬さの関係、Ｍｏ
の含有量と衝撃値の関係、Ｖの含有量と硬さの関係、Ｖ
の含有量と衝撃値の関係、Ｃｏの含有量と硬さの関係及
びＣｏの含有量と衝撃値の関係は、図１、図２、図３、
図４、図５、図６、図７、図８、図９及び図１０に示す
ようになった。表１及び図１〜図１０から、Ｃの含有量
を１．４〜２．２ｗｔ％、好ましくは１．７〜２．０ｗ
ｔ％、Ｓｉの含有量を０．５〜１．５ｗｔ％、Ｍｎの含
有量を０．５〜１．５ｗｔ％、Ｃｒの含有量を２．５〜
６．０ｗｔ％、好ましくは３．０〜５．０ｗｔ％、Ｍｏ
の含有量を１．５〜８．０ｗｔ％、好ましくは６．０〜
８．０ｗｔ％、Ｖの含有量を３．０〜６．０ｗｔ％、好
ましくは３．０〜５．０ｗｔ％及びＣｏの含有量を０〜
５．５ｗｔ％、好ましくは０．５〜１．５ｗｔ％とする
ことにより、硬さをＨＲＣ６２以上、衝撃値を５．０Ｊ
／ｃｍ2 以上とし得ることがわかる。The relationship between the C content and hardness, the relationship between the C content and impact value, the relationship between Cr content and hardness, the relationship between Cr content and impact value, the Mo content and Relationship of hardness, Mo
Between V content and hardness, V content and hardness, V
, The impact value, the relationship between the Co content and the hardness, and the relationship between the Co content and the impact value are shown in FIGS.
The results are shown in FIGS. 4, 5, 6, 7, 8, 9 and 10. From Table 1 and FIGS. 1 to 10, the content of C is 1.4 to 2.2 wt%, preferably 1.7 to 2.0 w%.
t%, the content of Si is 0.5 to 1.5 wt%, the content of Mn is 0.5 to 1.5 wt%, and the content of Cr is 2.5 to 1.5 wt%.
6.0 wt%, preferably 3.0 to 5.0 wt%, Mo
Of 1.5 to 8.0 wt%, preferably 6.0 to 8.0 wt%.
8.0 wt%, the content of V is 3.0 to 6.0 wt%, preferably 3.0 to 5.0 wt%, and the content of Co is 0 to 0 wt%.
By setting the content to 5.5 wt%, preferably 0.5 to 1.5 wt%, the hardness is HRC 62 or more and the impact value is 5.0 J.
/ Cm 2 or more.
【００１８】[0018]
【発明の効果】以上説明したように、本発明の高靱性合
金鋳鉄及びその製造方法によれば、硬さをＨＲＣ６２以
上、衝撃値を５．０Ｊ／ｃｍ2 以上とし得るので、靱性
を高クロム鋳鉄やニハード鋳鉄より大きくでき、かつ硬
さを高マンガン鋳鋼や低合金鋳鋼より高くすることがで
き、ひいては使用中に割れることがなく、高寿命の耐衝
撃摩耗材料、耐摩耗材料に用いることができる。As described above, according to the high toughness alloy cast iron of the present invention and the method for producing the same, the hardness can be made HRC 62 or more and the impact value can be made 5.0 J / cm 2 or more. Can be larger than cast iron or nihard cast iron, and can have higher hardness than high manganese cast steel or low alloy cast steel, and will not crack during use, and can be used for high life impact and wear resistant materials and wear resistant materials. it can.
【図１】Ｃの含有量と硬さの関係を表わした説明図であ
る。FIG. 1 is an explanatory diagram showing the relationship between the content of C and hardness.
【図２】Ｃの含有量と衝撃値の関係を表わした説明図で
ある。FIG. 2 is an explanatory diagram showing a relationship between a C content and an impact value.
【図３】Ｃｒの含有量と硬さの関係を表わした説明図で
ある。FIG. 3 is an explanatory diagram showing a relationship between a Cr content and hardness.
【図４】Ｃｒの含有量と衝撃値の関係を表わした説明図
である。FIG. 4 is an explanatory diagram showing a relationship between a Cr content and an impact value.
【図５】Ｍｏの含有量と硬さの関係を表わした説明図で
ある。FIG. 5 is an explanatory diagram showing a relationship between Mo content and hardness.
【図６】Ｍｏの含有量と衝撃値の関係を表わした説明図
である。FIG. 6 is an explanatory diagram showing a relationship between a Mo content and an impact value.
【図７】Ｖの含有量と硬さの関係を表わした説明図であ
る。FIG. 7 is an explanatory diagram showing a relationship between a V content and hardness.
【図８】Ｖの含有量と衝撃値の関係を表わした説明図で
ある。FIG. 8 is an explanatory diagram showing a relationship between a V content and an impact value.
【図９】Ｃｏの含有量と硬さの関係を表わした説明図で
ある。FIG. 9 is an explanatory diagram showing a relationship between a Co content and hardness.
【図１０】Ｃｏの含有量と衝撃値の関係を表わした説明
図である。FIG. 10 is an explanatory diagram showing a relationship between a Co content and an impact value.
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【手続補正書】[Procedure amendment]
【提出日】平成１１年１月２７日[Submission date] January 27, 1999
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 高靱性合金鋳鉄の製造方法The method of manufacturing high-toughness alloy cast iron [Title of the Invention]
【特許請求の範囲】[Claims]
【請求項１】 Ｃ１．４〜２．２ｗｔ％、Ｓｉ０．５〜
１．５ｗｔ％、Ｍｎ０．５〜１．５ｗｔ％、Ｃｒ２．５
〜６．０ｗｔ％、Ｍｏ１．５〜８．０ｗｔ％、Ｖ３．０
〜６．０ｗｔ％、Ｃｏ０〜５．５ｗｔ％及び残部がＦｅ
と不可避不純物からなる合金鋳鉄を９００〜１１００℃
の温度で加熱した後衝風冷却し、しかる後に４５０〜５
５０℃の温度で焼戻し処理することを特徴とする高靱性
合金鋳鉄の製造方法。[Claim 1] C1.4~2.2wt%, Si0.5~
1.5 wt%, Mn 0.5-1.5 wt%, Cr2.5
-6.0 wt%, Mo1.5-8.0 wt%, V3.0
To 6.0 wt%, Co0 to 5.5 wt%, and the balance Fe
Alloy cast iron consisting of unavoidable impurities and 900-1100 ° C
After heating at a temperature of 500 ° C., cooling by impingement, and then 450 to 5
A method for producing a high toughness alloy cast iron, characterized by performing a tempering treatment at a temperature of 50 ° C.
【請求項２】 前記焼戻し処理を２回以上行うことを特
徴とする請求項１記載の高靱性合金鋳鉄の製造方法。 2. A process for producing a high toughness alloy cast iron according to claim 1, characterized in that the tempering twice or more.
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、破砕機用耐衝撃摩
耗材料や粉砕機用耐摩耗材料として使用される高靱性合
金鋳鉄の製造方法に関する。The present invention relates to relates to a method of manufacturing a high-toughness alloy cast iron which is used as impact-wear material and crushing machine wear resistant material crusher.
【０００２】[0002]
【従来の技術】従来、破砕機用耐衝撃摩耗材料や粉砕機
用耐摩耗材料としては、高クロム鋳鉄（Ａ５３２（ＡＳ
ＴＭ））、ニハード鋳鉄、高マンガン鋳鋼（Ｇ５１３１
（ＪＩＳ），Ａ１２８（ＡＳＴＭ））又は低合金鋳鋼
（Ｇ５１１１（ＪＩＳ））等が使用されている。2. Description of the Related Art Conventionally, high-chromium cast iron (A532 (AS)
TM)), Ni-hard cast iron, high manganese cast steel (G5131)
(JIS), A128 (ASTM)) or low alloy cast steel (G5111 (JIS)) or the like is used.
【０００３】[0003]
【発明が解決しようとする課題】しかし、高クロム鋳鉄
やニハード鋳鉄では靱性が低く（高クロム鋳鉄：焼なら
し（空気焼入れ）、硬さＨＲＣ５５〜６５、衝撃値２〜
４Ｊ／ｃｍ2 （ノッチレス）、ニハード鋳鉄：硬さＨＲ
Ｃ６０〜６３、衝撃値１〜３Ｊ／ｃｍ2 ）、使用中に割
れることがある。一方、高マンガン鋳鋼や低合金鋳鋼で
は靱性が高いため（高マンガン鋳鋼：水靱処理（水焼入
れ）、硬さＨＲＣ２０（加工硬化後ＨＲＣ５０〜５
５）、衝撃値５０〜２００Ｊ／ｃｍ2 （Ｖノッチ）、低
合金鋳鋼：油焼入れ、焼戻し、硬さＨＲＣ４５〜５５、
衝撃値７〜３０Ｊ／ｃｍ2 （Ｕノッチ））、割れること
はないが耐用寿命が短い不具合がある。そこで、本発明
は、衝撃値が高クロム鋳鉄、ニハード鋳鉄より大きく、
硬さが高マンガン鋳鋼、低合金鋳鋼より高い高靱性合金
鋳鉄の製造方法を提供することを目的とする。However, high chromium cast iron or nihard cast iron has low toughness (high chromium cast iron: normalizing (air quenching), hardness HRC 55 to 65, impact value 2 to 2).
4J / cm 2 (notchless), Ni-hard cast iron: Hardness HR
C60-63, impact value 1-3 J / cm 2 ), and may crack during use. On the other hand, since high manganese cast steel and low alloy cast steel have high toughness (high manganese cast steel: water toughness treatment (water quenching), hardness HRC 20 (HRC 50 to 5 after work hardening)
5), impact value 50 to 200 J / cm 2 (V notch), low alloy cast steel: oil quenching, tempering, hardness HRC 45 to 55,
The impact value is 7 to 30 J / cm 2 (U notch)). Therefore, the present invention, the impact value is higher than high chromium cast iron, nihard cast iron,
Hardness high manganese cast steel, and to provide a process for producing a high toughness alloy <br/> Cast iron higher than the low alloy cast steel.
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するた
め、本発明の高靱性合金鋳鉄の製造方法は、Ｃ１．４〜
２．２ｗｔ％、Ｓｉ０．５〜１．５ｗｔ％、Ｍｎ０．５
〜１．５ｗｔ％、Ｃｒ２．５〜６．０ｗｔ％、Ｍｏ１．
５〜８．０ｗｔ％、Ｖ３．０〜６．０ｗｔ％、Ｃｏ０〜
５．５ｗｔ％及び残部がＦｅと不可避不純物からなる合
金鋳鉄を９００〜１１００℃の温度で加熱した後衝風冷
却し、しかる後に４５０〜５５０℃の温度で焼戻し処理
することを特徴とする。前記焼戻し処理は、２回以上行
うことが好ましい。In order to solve the above problems SUMMARY OF THE INVENTION The method for producing a high toughness alloy cast iron of the present invention, C1.4～
2.2 wt%, Si 0.5-1.5 wt%, Mn0.5
-1.5 wt%, Cr2.5-6.0 wt%, Mo1.
5 to 8.0 wt%, V3.0 to 6.0 wt%, Co0
It is characterized in that an alloy cast iron composed of 5.5 wt% and the balance of Fe and inevitable impurities is heated at a temperature of 900 to 1100 ° C., cooled by impingement, and then tempered at a temperature of 450 to 550 ° C. It is preferable that the tempering process is performed twice or more.
【０００５】Ｃ（カーボン）は、Ｃｒ（クロム）、Ｍｏ
（モリブデン）、Ｖ（バナジウム）と化合して各種の炭
化物を生成して硬さ（耐摩耗性）を高める。Ｃの含有量
が、１．４ｗｔ％未満であると、炭化物量が少なくなっ
て硬さが低下し、２．２ｗｔ％を超えると、靱性が低下
する。好ましい含有量は、１．７〜２．０ｗｔ％であ
る。C (carbon) is composed of Cr (chromium), Mo
(Molybdenum) and V (vanadium) combine to form various carbides to increase hardness (wear resistance). If the content of C is less than 1.4 wt%, the amount of carbides will decrease and the hardness will decrease, and if it exceeds 2.2 wt%, the toughness will decrease. The preferred content is 1.7 to 2.0 wt%.
【０００６】Ｓｉ（シリコン）は、溶湯の脱酸に寄与す
ると共に、湯流れを良くして鋳造性を良好にする。Ｓｉ
の含有量が、０．５ｗｔ％未満であると、上述した機能
が果たされず、１．５ｗｔ％を超えると、材質の脆化を
招く。好ましい含有量は、０．７〜１．３ｗｔ％であ
る。[0006] Si (silicon) contributes to the deoxidation of the molten metal and improves the flow of the molten metal to improve the castability. Si
If the content of is less than 0.5 wt%, the above-mentioned functions cannot be performed, and if it exceeds 1.5 wt%, the material becomes brittle. The preferred content is 0.7 to 1.3 wt%.
【０００７】Ｍｎ（マンガン）は、溶湯の脱酸と脱硫に
寄与し、又、焼入性と耐摩耗性に寄与する。Ｍｎの含有
量が、０．５ｗｔ％未満であると、上述した機能が果た
されず、１．５ｗｔ％を超えると、焼割れを招く。好ま
しい含有量は、０．７〜１．２ｗｔ％である。Mn (manganese) contributes to deoxidation and desulfurization of the molten metal, and also contributes to hardenability and wear resistance. If the content of Mn is less than 0.5 wt%, the above-mentioned function is not fulfilled, and if it exceeds 1.5 wt%, burning cracks are caused. The preferred content is 0.7 to 1.2 wt%.
【０００８】Ｃｒは、Ｃと化合して有能な炭化物を生成
すると共に、高温での耐酸化性を強め耐硫化性を改良す
る。Ｃｒの含有量が、２．５ｗｔ％未満であると、炭化
物量が少なくなって硬さが低下し、６．０ｗｔ％を超え
ると、靱性が低下する。好ましい含有量は、３．０〜
５．０ｗｔ％である。[0008] Cr combines with C to form a competent carbide, and at the same time, enhances oxidation resistance at high temperatures and improves sulfidation resistance. When the content of Cr is less than 2.5 wt%, the amount of carbide is reduced and the hardness is reduced, and when it exceeds 6.0 wt%, the toughness is reduced. The preferred content is 3.0 to
5.0 wt%.
【０００９】Ｍｏは、Ｃと化合して有能な炭化物を生成
すると共に、焼入性を高め、かつ、焼戻し脆化を防止す
る。Ｍｏの含有量が、１．５ｗｔ％未満であると、上述
した機能が果たされず、８．０ｗｔ％を超えると、靱性
が低下する。好ましい含有量は、６．０〜８．０ｗｔ％
である。Mo combines with C to form a competent carbide, enhances hardenability, and prevents tempering embrittlement. If the content of Mo is less than 1.5 wt%, the above-mentioned function is not fulfilled, and if it exceeds 8.0 wt%, the toughness is reduced. The preferred content is 6.0-8.0 wt%.
It is.
【００１０】Ｖは、炭化物生成能が大きく微粒炭化物を
生じ、組織を微細化し、硬さを高める。Ｖの含有量が、
３．０ｗｔ％未満であると、上述した機能が果たされ
ず、６．０ｗｔ％を超えると、上述した機能の飽和を招
く。好ましい含有量は、３．０〜５．０ｗｔ％である。[0010] V has a large carbide-forming ability to produce fine carbides, refine the structure, and increase the hardness. V content is
If the content is less than 3.0 wt%, the above-mentioned functions cannot be performed. If the content exceeds 6.0 wt%, the above-mentioned functions are saturated. The preferred content is 3.0 to 5.0 wt%.
【００１１】Ｃｏ（コバルト）は、高温強さを改良する
ために用いられる。Ｃｏの含有量が、５．５ｗｔ％を超
えると、上述した機能が飽和状態となる。好ましい含有
量は、０．５〜１．５ｗ％である。[0011] Co (cobalt) is used to improve high temperature strength. When the content of Co exceeds 5.5 wt%, the above-described functions are saturated. The preferred content is 0.5 to 1.5 w%.
【００１２】硬さが、ＨＲＣ６２未満であると、硬さが
高マンガン鋳鋼や低合金鋳鋼のそれと同等以下になり、
又、衝撃値が、５．０Ｊ／ｃｍ2 未満であると、高クロ
ム鋳鉄やニハード鋳鉄のそれと同等以下になる。When the hardness is less than HRC62, the hardness becomes equal to or lower than that of high manganese cast steel or low alloy cast steel,
When the impact value is less than 5.0 J / cm 2 , the impact value becomes equal to or less than that of high chromium cast iron or nihard cast iron.
【００１３】合金鋳鉄の加熱温度が、９００℃未満であ
ると、マトリックス中のＣ濃度の低下により硬さが低く
なり、１１００℃を超えると、残留γ量の増加により硬
さが低くなる。好ましい加熱温度は、９５０〜１１００
℃である。衝風冷却は、５〜３００℃／ｍｉｎの冷却速
度で行うことが好ましい。When the heating temperature of the alloy cast iron is lower than 900 ° C., the hardness becomes lower due to a decrease in the C concentration in the matrix, and when it exceeds 1100 ° C., the hardness becomes lower due to an increase in the amount of residual γ. Preferred heating temperatures are 950 to 1100
° C. The blast cooling is preferably performed at a cooling rate of 5 to 300 ° C./min.
【００１４】焼戻し処理温度が、４５０℃未満である
と、合金炭化物析出による二次硬化が起こらず、５５０
℃を超えると、硬さが低下する。好ましい処理温度は、
４８０〜５５０℃である。When the tempering temperature is lower than 450 ° C., secondary hardening due to precipitation of alloy carbide does not occur, and
If the temperature exceeds ℃, the hardness decreases. The preferred processing temperature is
480-550 ° C.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て具体的な実施例と比較例を参照して説明する。 実施例１〜１３、比較例１〜７ 先ず、Ｃ、Ｓｉ、Ｍｎ、Ｃｒ、Ｍｏ、Ｖ及びＣｏ（比較
例６は、他に０．１０ｗｔ％のＴｉ（チタン）、比較例
７は、他に０．０４ｗｔ％のＴｉを含有する）をそれぞ
れ表１に示す割合で含有し、残部がＦｅ（鉄）と不可避
不純物からなる各種の合金鋳鉄のテストピースを得た。
次に、各テストピースを１０００℃（比較例３は、１１
００℃）の温度で２〜２．５時間保持して加熱処理して
から５０〜１５０℃／ｍｉｎの冷却速度で衝風冷却する
空気焼入れ処理を施した後、５１０℃（比較例３は５５
０℃）の温度での焼戻し処理を２回（比較例３は、１
回）施したところ、それぞれの硬さ及び衝撃値は、表１
に示すようになった。Embodiments of the present invention will be described below with reference to specific examples and comparative examples. Examples 1 to 13 and Comparative Examples 1 to 7 First, C, Si, Mn, Cr, Mo, V and Co (Comparative Example 6 additionally includes 0.10 wt% of Ti (titanium), Comparative Example 7 includes other Containing 0.04 wt% of Ti) at the ratios shown in Table 1 and the balance being Fe (iron) and unavoidable impurities.
Next, each test piece was heated to 1000 ° C. (Comparative Example 3
(200 ° C.) for 2 to 2.5 hours, heat-treated, and then subjected to air quenching for blast cooling at a cooling rate of 50 to 150 ° C./min.
Tempering at a temperature of 0 ° C) twice (Comparative Example 3
Times), each hardness and impact value are shown in Table 1.
It became as shown in.
【００１６】[0016]
【表１】 [Table 1]
【００１７】又、Ｃの含有量と硬さの関係、Ｃの含有量
と衝撃値の関係、Ｃｒの含有量と硬さの関係、Ｃｒの含
有量と衝撃値の関係、Ｍｏの含有量と硬さの関係、Ｍｏ
の含有量と衝撃値の関係、Ｖの含有量と硬さの関係、Ｖ
の含有量と衝撃値の関係、Ｃｏの含有量と硬さの関係及
びＣｏの含有量と衝撃値の関係は、図１、図２、図３、
図４、図５、図６、図７、図８、図９及び図１０に示す
ようになった。表１及び図１〜図１０から、Ｃの含有量
を１．４〜２．２ｗｔ％、好ましくは１．７〜２．０ｗ
ｔ％、Ｓｉの含有量を０．５〜１．５ｗｔ％、Ｍｎの含
有量を０．５〜１．５ｗｔ％、Ｃｒの含有量を２．５〜
６．０ｗｔ％、好ましくは３．０〜５．０ｗｔ％、Ｍｏ
の含有量を１．５〜８．０ｗｔ％、好ましくは６．０〜
８．０ｗｔ％、Ｖの含有量を３．０〜６．０ｗｔ％、好
ましくは３．０〜５．０ｗｔ％及びＣｏの含有量を０〜
５．５ｗｔ％、好ましくは０．５〜１．５ｗｔ％とする
ことにより、硬さをＨＲＣ６２以上、衝撃値を５．０Ｊ
／ｃｍ2 以上とし得ることがわかる。The relationship between the C content and hardness, the relationship between the C content and impact value, the relationship between Cr content and hardness, the relationship between Cr content and impact value, the Mo content and Relationship of hardness, Mo
Between V content and hardness, V content and hardness, V
, The impact value, the relationship between the Co content and the hardness, and the relationship between the Co content and the impact value are shown in FIGS.
The results are shown in FIGS. 4, 5, 6, 7, 8, 9 and 10. From Table 1 and FIGS. 1 to 10, the content of C is 1.4 to 2.2 wt%, preferably 1.7 to 2.0 w%.
t%, the content of Si is 0.5 to 1.5 wt%, the content of Mn is 0.5 to 1.5 wt%, and the content of Cr is 2.5 to 1.5 wt%.
6.0 wt%, preferably 3.0 to 5.0 wt%, Mo
Of 1.5 to 8.0 wt%, preferably 6.0 to 8.0 wt%.
8.0 wt%, the content of V is 3.0 to 6.0 wt%, preferably 3.0 to 5.0 wt%, and the content of Co is 0 to 0 wt%.
By setting the content to 5.5 wt%, preferably 0.5 to 1.5 wt%, the hardness is HRC 62 or more and the impact value is 5.0 J.
/ Cm 2 or more.
【００１８】[0018]
【発明の効果】以上説明したように、本発明の高靱性合
金鋳鉄の製造方法によれば、硬さをＨＲＣ６２以上、衝
撃値を５．０Ｊ／ｃｍ2 以上とし得るので、靱性を高ク
ロム鋳鉄やニハード鋳鉄より大きくでき、かつ硬さを高
マンガン鋳鋼や低合金鋳鋼より高くすることができ、ひ
いては使用中に割れることがなく、高寿命の耐衝撃摩耗
材料、耐摩耗材料に用いることができる。As described in the foregoing, according to the manufacturing method of the high toughness alloy cast iron of the present invention, the hardness HRC62 or more, since the impact value may be a 5.0J / cm 2 or more, the toughness high chromium Can be larger than cast iron or nihard cast iron, and can have higher hardness than high manganese cast steel or low alloy cast steel, and will not crack during use, and can be used for high life impact and wear resistant materials and wear resistant materials. it can.
【図面の簡単な説明】[Brief description of the drawings]
【図１】Ｃの含有量と硬さの関係を表わした説明図であ
る。FIG. 1 is an explanatory diagram showing the relationship between the content of C and hardness.
【図２】Ｃの含有量と衝撃値の関係を表わした説明図で
ある。FIG. 2 is an explanatory diagram showing a relationship between a C content and an impact value.
【図３】Ｃｒの含有量と硬さの関係を表わした説明図で
ある。FIG. 3 is an explanatory diagram showing a relationship between a Cr content and hardness.
【図４】Ｃｒの含有量と衝撃値の関係を表わした説明図
である。FIG. 4 is an explanatory diagram showing a relationship between a Cr content and an impact value.
【図５】Ｍｏの含有量と硬さの関係を表わした説明図で
ある。FIG. 5 is an explanatory diagram showing a relationship between Mo content and hardness.
【図６】Ｍｏの含有量と衝撃値の関係を表わした説明図
である。FIG. 6 is an explanatory diagram showing a relationship between a Mo content and an impact value.
【図７】Ｖの含有量と硬さの関係を表わした説明図であ
る。FIG. 7 is an explanatory diagram showing a relationship between a V content and hardness.
【図８】Ｖの含有量と衝撃値の関係を表わした説明図で
ある。FIG. 8 is an explanatory diagram showing a relationship between a V content and an impact value.
【図９】Ｃｏの含有量と硬さの関係を表わした説明図で
ある。FIG. 9 is an explanatory diagram showing a relationship between a Co content and hardness.
【図１０】Ｃｏの含有量と衝撃値の関係を表わした説明
図である。FIG. 10 is an explanatory diagram showing a relationship between a Co content and an impact value.
Claims (3)
１．５ｗｔ％、Ｍｎ０．５〜１．５ｗｔ％、Ｃｒ２．５
〜６．０ｗｔ％、Ｍｏ１．５〜８．０ｗｔ％、Ｖ３．０
〜６．０ｗｔ％、Ｃｏ０〜５．５ｗｔ％及び残部がＦｅ
と不可避不純物からなり、硬さＨＲＣ６２以上、衝撃値
５．０Ｊ／ｃｍ2 以上であることを特徴とする高靱性合
金鋳鉄。1. C1.4 to 2.2 wt%, Si0.5 to
1.5 wt%, Mn 0.5-1.5 wt%, Cr2.5
-6.0 wt%, Mo1.5-8.0 wt%, V3.0
To 6.0 wt%, Co0 to 5.5 wt%, and the balance Fe
A high toughness alloy cast iron comprising a hardness of HRC 62 or more and an impact value of 5.0 J / cm 2 or more.
１．５ｗｔ％、Ｍｎ０．５〜１．５ｗｔ％、Ｃｒ２．５
〜６．０ｗｔ％、Ｍｏ１．５〜８．０ｗｔ％、Ｖ３．０
〜６．０ｗｔ％、Ｃｏ０〜５．５ｗｔ％及び残部がＦｅ
と不可避不純物からなる合金鋳鉄を９００〜１１００℃
の温度で加熱した後衝風冷却し、しかる後に４５０〜５
５０℃の温度で焼戻し処理することを特徴とする高靱性
合金鋳鉄の製造方法。2. C 1.4 to 2.2 wt%, Si 0.5 to
1.5 wt%, Mn 0.5-1.5 wt%, Cr2.5
-6.0 wt%, Mo1.5-8.0 wt%, V3.0
To 6.0 wt%, Co0 to 5.5 wt%, and the balance Fe
Alloy cast iron consisting of unavoidable impurities and 900-1100 ° C
After heating at a temperature of 500 ° C., cooling by impingement, and then 450 to 5
A method for producing a high toughness alloy cast iron, characterized by performing a tempering treatment at a temperature of 50 ° C.
徴とする請求項２記載の高靱性合金鋳鉄の製造方法。3. The method for producing a high toughness alloy cast iron according to claim 2, wherein said tempering treatment is performed twice or more.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10707998A JP2934226B1 (en) | 1998-04-02 | 1998-04-02 | Manufacturing method of high toughness alloy cast iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10707998A JP2934226B1 (en) | 1998-04-02 | 1998-04-02 | Manufacturing method of high toughness alloy cast iron |
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| Publication Number | Publication Date |
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| JP2934226B1 JP2934226B1 (en) | 1999-08-16 |
| JPH11286740A true JPH11286740A (en) | 1999-10-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014481A (en) * | 2012-12-10 | 2013-04-03 | 马鞍山市恒达耐磨材料有限责任公司 | Multielement low alloy bainite spheroidal graphite cast iron grinding ball and manufacturing method thereof |
| CN104178688A (en) * | 2014-08-29 | 2014-12-03 | 丹阳嘉伟耐磨材料科技有限公司 | Boron-containing wear-resistant alloy with impact resistance and preparation method thereof |
| CN107604240A (en) * | 2017-11-07 | 2018-01-19 | 德清雄峰铸造有限公司 | Alloy cast iron |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935505B (en) * | 2012-11-01 | 2015-03-18 | 中原利达铁路轨道技术发展有限公司 | Casting method of low temperature resistant iron cushion plate for high speed railway buckling part |
-
1998
- 1998-04-02 JP JP10707998A patent/JP2934226B1/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014481A (en) * | 2012-12-10 | 2013-04-03 | 马鞍山市恒达耐磨材料有限责任公司 | Multielement low alloy bainite spheroidal graphite cast iron grinding ball and manufacturing method thereof |
| CN104178688A (en) * | 2014-08-29 | 2014-12-03 | 丹阳嘉伟耐磨材料科技有限公司 | Boron-containing wear-resistant alloy with impact resistance and preparation method thereof |
| CN107604240A (en) * | 2017-11-07 | 2018-01-19 | 德清雄峰铸造有限公司 | Alloy cast iron |
Also Published As
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| JP2934226B1 (en) | 1999-08-16 |
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