JPH0578781A - High strength and high toughness wear resistant steel - Google Patents
High strength and high toughness wear resistant steelInfo
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- JPH0578781A JPH0578781A JP6479291A JP6479291A JPH0578781A JP H0578781 A JPH0578781 A JP H0578781A JP 6479291 A JP6479291 A JP 6479291A JP 6479291 A JP6479291 A JP 6479291A JP H0578781 A JPH0578781 A JP H0578781A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、土木建設機械などの
掘削用刃先などに用いる高強度かつ靱性および高温での
耐摩耗性が良好な高強度高靱性耐摩耗用鋼に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength, high-toughness wear-resistant steel having high strength and toughness and good wear resistance at high temperatures, which is used for excavating cutting edges of civil engineering construction machines and the like.
【０００２】[0002]
【従来の技術】土木建設機械の掘削刃先を代表する一例
としてブルドーザのリッパーポイントが挙げられる。こ
れは、ブルドーザに特設した掘削機構に取り付けて岩盤
に押し込んで岩盤を割るものである。図１は、このリッ
パーポイントをシャンクとともに示す。図中、リッパー
ポイント１はシャンク２に取り付けられ、このシャンク
２がブルドーザの掘削機構(図示せず) に装着されるの
である。2. Description of the Related Art A bulldozer ripper point is a typical example of a cutting edge of a civil construction machine. This is to attach a bulldozer to a special excavation mechanism and push it into the rock to break it. FIG. 1 shows this ripper point with a shank. In the figure, the ripper point 1 is attached to a shank 2, and this shank 2 is attached to an excavation mechanism (not shown) of the bulldozer.
【０００３】従来、このような掘削刃先に用いる鋼材の
必要特性としては引張強さ150kgf/mm2以上、硬さHRC 50
以上、シャルピー衝撃値５kgf-m/cm2 以上でかつ曲げ特
性が良好であることが必要とされ、これを満足し、広く
用いられてきたのはNi−Cr−Mo系低合金鋼(JIS SNCM240
等) であった。しかし、このような掘削刃先を用いる使
用環境も年々より苛酷になり、それに伴って掘削刃先に
用いる鋼材に要求される特性も厳しくなっている。Conventionally, the necessary properties of the steel material used for such an excavating cutting edge are tensile strength of 150 kgf / mm 2 or more and hardness HRC 50.
As described above, it is necessary that the Charpy impact value is 5 kgf-m / cm 2 or more and that the bending characteristics are good, and satisfying this, Ni-Cr-Mo low alloy steel (JIS SNCM240 has been widely used.
Etc.). However, the environment in which such a drilling edge is used has become more severe year by year, and the characteristics required for the steel material used for the drilling edge have become stricter accordingly.
【０００４】例えば、リッパーポイントを使って硬い岩
盤を掘削した場合、リッパーポイントの表面温度は最高
450 ℃以上に達するため、従来のJIS SNCM240では硬さ
の低下が大きく、摩耗が激しくなる。しかし、高温での
耐摩耗性向上のため硬さレベルを上昇させると、今度
は、使用時の曲げ応力により切損等が発生する。For example, when hard rock is excavated using the ripper point, the surface temperature of the ripper point is the highest.
Since the temperature reaches 450 ° C or higher, the conventional JIS SNCM240 has a large decrease in hardness and becomes severely worn. However, if the hardness level is increased to improve wear resistance at high temperatures, bending stress during use will cause cutting damage and the like.
【０００５】特公昭60−25498 号等で提案がなされてい
る掘削用鋼は、靱性および高温での耐摩耗性が良好でか
つ、その製造時の熱間加工性に優れたものであるが、こ
れらの鋼でも近年のように使用条件の厳しい場合、強
度、靱性の面で十分ではなく、切損、激しい摩耗等が発
生する。また、これらの鋼は高合金鋼でありかつ、焼入
温度を高くする必要があるなど経済的でない。しかも、
最近では、需要者からの使用寿命のより一層の延長、コ
ストダウン等の要求も強く、それらの要求をいずれも満
足するより優れた鋼種の開発が求められている。The steel for drilling proposed in Japanese Examined Patent Publication No. 60-25498 and the like has good toughness and wear resistance at high temperatures, and is excellent in hot workability during its production. When these steels are used under severe operating conditions as in recent years, the strength and toughness are not sufficient, and cutting damage and severe wear occur. Further, these steels are high alloy steels, and it is not economical because it is necessary to raise the quenching temperature. Moreover,
Recently, there are strong demands from consumers for further extension of service life and cost reduction, and there is a demand for the development of superior steel grades that satisfy all of these demands.
【０００６】[0006]
【発明が解決しようとする課題】したがって、本発明の
一般的目的は、高強度、高靱性でかつ、高温での耐摩耗
性が良好な鋼を提供することである。本発明の具体的な
目的は、リッパーポイントの使用温度が450 ℃以上に達
することから、焼戻し温度が500 ℃以上で引張強さ 180
kgf/mm2 以上、硬さHRC 50以上、シャルピー衝撃値５kg
f-m/cm2 以上であって、曲げ特性はタワミ量が30mm以上
である高強度、高靱性でかつ、高温での耐摩耗性が良好
な鋼を提供することである。Therefore, a general object of the present invention is to provide a steel having high strength, high toughness and good wear resistance at high temperatures. A specific object of the present invention is that since the working temperature of the ripper point reaches 450 ℃ or more, the tempering temperature is 500 ℃ or more, the tensile strength is 180
kgf / mm 2 or more, hardness HRC 50 or more, Charpy impact value 5 kg
It is to provide a steel having a bending strength of fm / cm 2 or more, a bending strength of 30 mm or more, high strength, high toughness, and good wear resistance at high temperatures.
【０００７】[0007]
【課題を解決するための手段】本発明者らはこのような
必要特性を有する鋼を得るため鋭意実験、研究を重ねた
結果、以下の条件を満足することが有効であることを知
見し、この発明を完成した。 低Ｐ、低Ｓ化による粒界偏析の軽減および清浄化、さ
らに低Mn化することで粒界の強化が可能となり、靱性向
上に有効であること。 Moの増量とNb添加により、鋼の細粒化が著しく促進さ
れ、それに伴って粒界偏析が軽減され靱性向上が図られ
ること。Means for Solving the Problems The inventors of the present invention have found that it is effective to satisfy the following conditions as a result of intensive experiments and research for obtaining a steel having such required properties. Completed this invention. Reduction of grain boundary segregation by lowering P and S and cleaning, and strengthening of grain boundaries by lowering Mn are effective for improving toughness. By increasing the amount of Mo and adding Nb, the grain refinement of steel is significantly promoted, and along with that, segregation of grain boundaries is reduced and toughness is improved.
【０００８】Nb、Cr、Moの複合添加は、鋼の焼戻し軟
化抵抗を著しく高め、それによって高い焼戻し温度が採
用でき、靱性向上がみられ、また使用中に温度が上昇す
ることによる軟化が防止されること。ここに、この発明
は、重量％で、 Ｃ: 0.35〜0.55％、 Si: 0.50％以下、 Mn:0.50
％以下、Ｐ: 0.015 ％以下、 Ｓ: 0.010 ％以下、
Cr: 1.00〜2.50％、Mo: 1.00〜2.00％、 Ｖ: 0.05〜
0.30％、 Ｂ: 0.0003〜0.0050％、Al: 0.005 〜0.10
％、 Nb: 0.005 〜0.20％ を含有し、さらに必要に応じ Zr: 0.01〜0.15％、Ti: 0.01〜0.10％の１種または２種
を含有し、残部は実質的にFeおよび不可避的不純物から
成る鋼組成を有する高強度高靱性耐摩耗用鋼である。The combined addition of Nb, Cr and Mo remarkably enhances the temper softening resistance of the steel, whereby a high tempering temperature can be adopted, toughness is improved, and softening due to temperature rise during use is prevented. To be done. Here, the present invention, by weight%, C: 0.35 to 0.55%, Si: 0.50% or less, Mn: 0.50
% Or less, P: 0.015% or less, S: 0.010% or less,
Cr: 1.00 to 2.50%, Mo: 1.00 to 2.00%, V: 0.05 to
0.30%, B: 0.0003 to 0.0050%, Al: 0.005 to 0.10
%, Nb: 0.005 to 0.20%, and optionally 1 or 2 of Zr: 0.01 to 0.15% and Ti: 0.01 to 0.10%, with the balance being substantially Fe and unavoidable impurities. It is a high strength and high toughness wear resistant steel having the following steel composition.
【０００９】[0009]
【作用】この発明において、鋼の成分を限定した理由を
以下に述べる。なお、本明細書において％は特にことわ
りがない限り、重量％である。 Ｃ: 0.35〜0.55％ Ｃは焼入れ性および強度の確保のためばかりでなく、結
晶組織の細粒化のためにも必要な成分であるが、0.35％
未満では焼入れ性の劣化をきたし、また所望の強度を確
保することができず、一方0.55％を超えると焼入れ時の
焼割れ感受性が増加し、また他の合金成分と関連して靱
性劣化を招くことから0.35〜0.55％とした。好ましく
は、0.40〜0.50％である。In the present invention, the reasons for limiting the components of steel will be described below. In this specification,% means% by weight unless otherwise specified. C: 0.35 to 0.55% C is a component necessary not only for ensuring hardenability and strength but also for refining the crystal structure, but 0.35%
If less than 0.5%, the hardenability deteriorates, and the desired strength cannot be ensured. On the other hand, if it exceeds 0.55%, the susceptibility to quench cracking during quenching increases, and the toughness deteriorates in association with other alloy components. Therefore, it was set to 0.35 to 0.55%. Preferably, it is 0.40 to 0.50%.
【００１０】Si: 0.50％以下 Siは鋼の脱酸および強度の確保に有効な元素である。し
かし、0.50％を超えると偏析して靱性を劣化させるた
め、その含有量は0.50％以下とした。 Mn: 0.50％以下 Mnは脱酸作用の外、焼入性を向上させるのに有効な元素
であるが、多量に含有させると粒界脆化現象が生じ、靱
性の劣化をきたす。さらに、Ｓと結合して割れの起点と
なることからも靱性向上のためには極力その含有量を低
下させなければならない。このため、Mn含有量は0.50％
以下とした。Si: 0.50% or less Si is an element effective for deoxidizing steel and ensuring strength. However, if it exceeds 0.50%, it segregates and deteriorates the toughness, so the content was made 0.50% or less. Mn: 0.50% or less Mn is an element effective not only for deoxidizing action but also for improving hardenability. However, if contained in a large amount, grain boundary embrittlement phenomenon occurs and deterioration of toughness occurs. Further, since it is combined with S and becomes a starting point of cracking, its content must be reduced as much as possible in order to improve toughness. Therefore, the Mn content is 0.50%
Below.
【００１１】Ｐ: 0.015 ％以下 Ｐはいかなる熱処理を施してもその粒界偏析を完全に消
滅することはできず、かつ粒界強度を低下させ靱性を劣
化させるため、P 含有量は0.015 ％以下に制限した。 Ｓ: 0.010 ％以下 ＳはMnと結合して生成したMnS が割れの起点となり、さ
らに単独でも粒界に偏析して脆化を促進するため、極力
その含有量を低く制限することが必要である。この発明
にあっては0.010 ％以下に制限する。P: 0.015% or less P does not completely eliminate the grain boundary segregation by any heat treatment, and lowers the grain boundary strength and deteriorates the toughness. Therefore, the P content is 0.015% or less. Limited to. S: 0.010% or less S is a starting point for cracking when MnS is formed by combining with Mn, and even segregates at grain boundaries to promote embrittlement, so it is necessary to limit the content as low as possible. .. In this invention, it is limited to 0.010% or less.
【００１２】Cr: 1.00〜2.50％ Crは鋼の焼入性を向上させ、かつ鋼に焼戻し軟化抵抗を
付与する作用がある。特に、Mo、Nbとの複合添加で著し
い軟化抵抗を鋼に付与する作用を有するが、その含有量
が1.00％未満では所望の効果が得られず、他方Crは高価
な合金元素であるため経済性を考慮し、上限を2.50％と
した。Cr: 1.00 to 2.50% Cr has the effects of improving the hardenability of steel and imparting temper softening resistance to steel. In particular, Mo and Nb have the effect of imparting remarkable softening resistance to steel by the combined addition, but if the content is less than 1.00% the desired effect is not obtained, while Cr is an expensive alloy element, so it is economical. The upper limit was set to 2.50% in consideration of sex.
【００１３】Mo: 1.00〜2.00％ Moは鋼の焼入れ性を向上させ、かつ鋼に焼戻し軟化抵抗
を付与する作用があり、特にCr、Nbとの複合添加で焼戻
し軟化抵抗性を著しく増大させ、高い焼戻し温度の採用
を可能にして靱性の改善にも有効である。しかし、1.00
％未満では前記作用が発揮されず、所望の効果が得られ
ない。他方、2.00％を超えて添加してもその効果は飽和
し、コスト上昇を招くだけであるため、その含有量を1.
00〜2.00％とした。Mo: 1.00 to 2.00% Mo has the effect of improving the hardenability of steel and imparting temper softening resistance to the steel. Particularly, by adding Cr and Nb in combination, the temper softening resistance is significantly increased, It is also effective in improving toughness by enabling the use of high tempering temperature. But 1.00
If it is less than%, the above effect is not exhibited and the desired effect cannot be obtained. On the other hand, even if added over 2.00%, the effect is saturated and only cost rises, so its content is 1.
It was set to 00 to 2.00%.
【００１４】Ｖ: 0.05〜0.30％ Ｖは、焼戻し軟化抵抗を付与する作用があり、かつ結晶
粒粗大化防止、耐摩耗性向上に有効であるが、0.05％未
満ではその作用が発揮されず、所望の効果が得られな
い。他方、0.30％を超えると熱間加工性、被削性、靱性
の低下を招くことから、その含有量を0.05〜0.30％とし
た。V: 0.05 to 0.30% V has an effect of imparting temper softening resistance and is effective for preventing crystal grain coarsening and improving wear resistance, but if it is less than 0.05%, the effect is not exhibited. The desired effect cannot be obtained. On the other hand, if it exceeds 0.30%, the hot workability, machinability and toughness are deteriorated, so the content was made 0.05 to 0.30%.
【００１５】Ｂ: 0.0003〜0.0050％ Ｂは、焼入れ性を向上させる作用を有し、高強度の確保
に有効な元素であるが、0.0003％未満ではその効果は得
られず、他方0.0050％を超えると鋼の靱性の劣化をきた
すため、B 添加量は0.0003〜0.0050％とした。B: 0.0003 to 0.0050% B has an effect of improving the hardenability and is an element effective for ensuring high strength. However, if it is less than 0.0003%, the effect cannot be obtained, and on the other hand, it exceeds 0.0050%. In addition, the addition amount of B was set to 0.0003 to 0.0050% in order to deteriorate the toughness of steel.
【００１６】Al: 0.005 〜0.10％ Alは鋼の脱酸の安定化、結晶組織の均質化および細粒化
をはかるのに有効な成分であるが、0.005 ％未満では所
望の効果が得られず、他方0.10％を超えてもその効果は
飽和してしまい、また介在物の増大により疵が発生し、
靱性も劣化するのでこの発明にあってAl含有量は0.005
〜0.10％とした。Al: 0.005 to 0.10% Al is an effective component for stabilizing the deoxidation of steel, homogenizing the crystal structure and grain refining, but if it is less than 0.005%, the desired effect cannot be obtained. On the other hand, even if it exceeds 0.10%, the effect will be saturated, and flaws will occur due to the increase of inclusions,
Since the toughness also deteriorates, the Al content in this invention is 0.005.
It was set to 0.10%.
【００１７】Nb: 0.005 〜0.20％ Nbは鋼の強度、靱性の向上と細粒化に対して有効であ
り、特にCr、Moとの複合添加で著しく鋼を細粒化し、焼
戻し軟化抵抗を著しく高めるので、靱性改善に極めて有
効な元素であるが、その効果を確保するためには0.005
％以上必要である。他方、0.20％を超えるとその効果は
飽和し、かつコストも高くつくことから0.005 〜0.20％
とした。Nb: 0.005 to 0.20% Nb is effective for improving the strength and toughness of steel and for grain refining. Particularly, by adding Cr and Mo together, the steel is remarkably grain refined and the temper softening resistance is remarkably increased. It is an element that is extremely effective in improving toughness because it is increased, but 0.005 is required to secure its effect.
% Or more is required. On the other hand, if it exceeds 0.20%, the effect is saturated and the cost is high, so 0.005-0.20%
And
【００１８】Zr: 0.01〜0.15％および／またはTi: 0.01
〜0.10％ Zr、Tiは靱性改善のため所望により添加すればよい。Zr
は鋼中炭化物を球状細粒化して分散させて靱性を一層改
善する効果を有する。特に高強度鋼の場合に高靱性を得
るために添加するのが好ましいが、0.01％未満ではその
効果が小さく、他方0.15％を超えるとむしろ靱性劣化を
きたすため、0.01〜0.15％とした。Zr: 0.01 to 0.15% and / or Ti: 0.01
˜0.10% Zr, Ti may be added if desired to improve toughness. Zr
Has the effect of further improving the toughness by making the carbides in the steel spherical and finely dispersed. Particularly in the case of high strength steel, it is preferable to add it in order to obtain high toughness, but if it is less than 0.01%, its effect is small, and if it exceeds 0.15%, toughness is rather deteriorated, so it was made 0.01 to 0.15%.
【００１９】Tiは、鋼の焼入性を一段と向上させる作用
もある。特に鋼製品寸法が大きい場合に高強度を確保す
る目的で含有させるのが好ましいが、0.01未満ではその
効果が得られず、他方0.10％を超えると鋼の靱性を劣化
させるため0.01〜0.10％とした。Ti also has the effect of further improving the hardenability of steel. Especially when the steel product size is large, it is preferable to contain it for the purpose of ensuring high strength, but if it is less than 0.01, its effect cannot be obtained, while if it exceeds 0.10%, it deteriorates the toughness of the steel and 0.01 to 0.10%. did.
【００２０】ここに、この発明にかかる鋼の製造に際し
ては、上記組成に調整した鋼を溶製し、連続鋳造あるい
は造塊法によって鋼片としてから適宜熱間あるいは冷間
加工を行って所定形状としてから焼き入れ、焼き戻しす
る。これにより、HRC 硬度50以上、衝撃値5kgf-m/cm2以
上、そしてたわみ量30mm以上の特性を有する鋼が得ら
れ、特に土木建設機械の掘削刃先として使用するのに適
する材料となる。In the production of the steel according to the present invention, the steel adjusted to the above composition is melted and made into a steel piece by continuous casting or an ingot making method, and then hot or cold working is appropriately performed to obtain a predetermined shape. Then, quench and temper. As a result, a steel having properties such as an HRC hardness of 50 or more, an impact value of 5 kgf-m / cm 2 or more, and a deflection amount of 30 mm or more can be obtained, which is a material particularly suitable for use as an excavating cutting edge of a civil construction machine.
【００２１】[0021]
【実施例】通常の方法によって、表１に示す成分を有す
る鋼Ａ〜Ｑを溶製した。これらの鋼のうち、鋼Ａ〜Ｉは
この発明の範囲内の組成を有しており、鋼Ｊ〜Ｑはこの
発明の規定する組成範囲を外れた比較鋼である。これら
の鋼を連続鋳造法あるいは造塊法にて鋼片となした後、
1200〜1250℃に加熱後、通常の方法にて直径30mmの丸棒
に圧延した後、表２に示す熱処理条件にて焼入・焼戻を
行った。なお、焼戻しは使用時400 ℃前後まで昇温する
ことから、それより高い温度が必要なことから500 ℃一
定とした。EXAMPLES Steels A to Q having the components shown in Table 1 were melted by a usual method. Among these steels, Steels A to I have compositions within the scope of the present invention, and Steels J to Q are comparative steels outside the composition range specified by the present invention. After making these steel into billet by continuous casting method or ingot making method,
After heating at 1200 to 1250 ° C., it was rolled into a round bar having a diameter of 30 mm by a usual method, and then quenched and tempered under the heat treatment conditions shown in Table 2. Since tempering raises the temperature up to around 400 ° C during use, a higher temperature is required, so it was kept constant at 500 ° C.
【００２２】この後、各種試験片に加工し特性を調査し
た。その結果を表２に示す。なお、衝撃値はシャルピー
試験値であり、タワミ量は図２に示す要領で二つの支点
３の上に載置された試験片 (寸法：22×20×170mm)４の
幅方向に横断して押片５によって矢印方向から荷重をか
ける曲げ試験を実施し、破断した時のタワミ量を示す。
タワミ量が30mm以上で破断しない場合、破断せずとし
た。表２の結果より、この発明にかかる鋼はいずれも各
要求特性において目標性能を満足しており、優れた強
度、靱性を示すことが明らかである。After that, various test pieces were processed and their characteristics were investigated. The results are shown in Table 2. The impact value is the Charpy test value, and the deflection amount is across the width of the test piece (dimensions: 22 × 20 × 170 mm) 4 placed on the two fulcrums 3 as shown in FIG. A bending test in which a load is applied from the direction of the arrow by the pressing piece 5 is carried out, and the amount of deflection when broken is shown.
If the amount of deflection does not break at 30 mm or more, the sample was not broken. From the results in Table 2, it is clear that all the steels according to the present invention satisfy the target performance in each required characteristic and exhibit excellent strength and toughness.
【００２３】また、これらの鋼の一部について掘削刃先
の代表としてあげられるリッパーポイントに試作し、実
際に１時間使用した後の摩耗量を調べた。その結果を表
２に示す。使用条件はいずれも同一であったため、各摩
耗量を比較することで耐摩耗性が評価できる。この発明
にかかる鋼はいずれも良好な耐摩耗性を有することが判
明した。なお、鋼Ｐは特公昭60−25498 号公報に開示さ
れた鋼に相当する。この発明にかかる鋼のほぼ倍の摩耗
量を示した。Further, some of these steels were experimentally manufactured at a ripper point, which is a typical example of a cutting edge, and the amount of wear after actually using for one hour was examined. The results are shown in Table 2. Since the use conditions were the same, the wear resistance can be evaluated by comparing the wear amounts. It has been found that all the steels according to the present invention have good wear resistance. The steel P corresponds to the steel disclosed in Japanese Patent Publication No. 60-25498. The amount of wear was almost double that of the steel according to the present invention.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】図３は、本例の各鋼についてCr、Mo、Nbの
共存による焼き戻し軟化抵抗に及ぼす相乗的効果を示す
もので、焼き戻し温度を500 ℃一定としたときのHRC 硬
度でもって軟化抵抗を評価するものである。図中、破線
で囲む領域がこの発明の領域であって、いずれも衝撃値
５kgf-m/cm2 以上、HRC 硬度50以上を示す。FIG. 3 shows the synergistic effect of the coexistence of Cr, Mo and Nb on the temper softening resistance of each of the steels of this example, and shows the HRC hardness when the tempering temperature is kept constant at 500 ° C. The softening resistance is evaluated. In the figure, the area surrounded by the broken line is the area of the present invention, and each shows an impact value of 5 kgf-m / cm 2 or more and an HRC hardness of 50 or more.
【００２７】[0027]
【発明の効果】以上に説明したごとく、この発明によれ
ば、500 ℃焼戻しでHRC 50以上、引張強さで180 kgf/mm
2 以上の高強度を有し、かつ高靱性および良好な冷間曲
げ特性を有する高強度、高靱性鋼を得ることができるの
で、土木建設機械などに用いられる掘削用刃先、工具な
どに廉価な合金鋼として提供し得るという大なる効果を
奏するものである。As described above, according to the present invention, HRC of 50 or more when tempered at 500 ° C and 180 kgf / mm in tensile strength.
It is possible to obtain high-strength, high-toughness steel with high strength of 2 or more, high toughness, and good cold bending properties, so it is inexpensive for excavating cutting edges and tools used in civil engineering construction machines. It has a great effect that it can be provided as alloy steel.
【図１】図１はブルドーザに取り付けるリッパーポイン
トを示す略式斜視図である。FIG. 1 is a schematic perspective view showing a ripper point attached to a bulldozer.
【図２】図２は曲げ試験の要領の説明図である。FIG. 2 is an explanatory diagram of the procedure of a bending test.
【図３】図３はCr、Mo、Nbの共存効果を示すグラフであ
る。FIG. 3 is a graph showing the coexistence effect of Cr, Mo, and Nb.
１ リッパーポイント ２ シャンク ３ 支点 ４ 試験片 ５ 押片 1 Ripper point 2 Shank 3 Support point 4 Test piece 5 Push piece
───────────────────────────────────────────────────── フロントページの続き (72)発明者 涌波 喜幸 北九州市小倉北区許斐町１番地 住友金属 工業株式会社小倉製鉄所内 (72)発明者 田川 富啓 大阪府枚方市上野３丁目１番１号 株式会 社小松製作所内 (72)発明者 大川 和英 大阪府枚方市上野３丁目１番１号 株式会 社小松製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Wakunami 1 Kunomi-cho, Kokurakita-ku, Kitakyushu City Sumitomo Metal Industries, Ltd. Kokura Works (72) Inventor Tomihiro Tagawa 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. (72) Inventor Kazuhide Okawa 3-1-1 Ueno, Hirakata City, Osaka Prefecture Komatsu Ltd.
Claims (2)
％以下、 Ｐ: 0.015 ％以下、 Ｓ: 0.010 ％以下、 Cr: 1.00
〜2.50％、 Mo: 1.00〜2.00％、 Ｖ: 0.05〜0.30％、 Ｂ: 0.00
03〜0.0050％、 Al: 0.005 〜0.10％ Nb: 0.005 〜0.20％を含有し、 残部は実質的にFeおよび不可避的不純物から成る鋼組成
を有する高強度高靱性耐摩耗用鋼。1. By weight%, C: 0.35 to 0.55%, Si: 0.50% or less, Mn: 0.50
% Or less, P: 0.015% or less, S: 0.010% or less, Cr: 1.00
~ 2.50%, Mo: 1.00 ~ 2.00%, V: 0.05 ~ 0.30%, B: 0.00
A high-strength, high-toughness wear-resistant steel having a steel composition containing 03 to 0.0050%, Al: 0.005 to 0.10% Nb: 0.005 to 0.20%, and the balance being substantially Fe and inevitable impurities.
はTi: 0.01〜0.10％を含有する請求項１記載の高強度高
靱性耐摩耗用鋼。2. The high-strength, high-toughness wear-resistant steel according to claim 1, further containing Zr: 0.01 to 0.15% and / or Ti: 0.01 to 0.10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06479291A JP3360687B2 (en) | 1991-03-28 | 1991-03-28 | High-strength, high-toughness wear-resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06479291A JP3360687B2 (en) | 1991-03-28 | 1991-03-28 | High-strength, high-toughness wear-resistant steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0578781A true JPH0578781A (en) | 1993-03-30 |
| JP3360687B2 JP3360687B2 (en) | 2002-12-24 |
Family
ID=13268443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06479291A Expired - Lifetime JP3360687B2 (en) | 1991-03-28 | 1991-03-28 | High-strength, high-toughness wear-resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3360687B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999031288A1 (en) * | 1997-12-15 | 1999-06-24 | Caterpillar Inc. | Improved hardness, strength, and fracture toughness steel |
| US6899774B2 (en) | 2001-07-12 | 2005-05-31 | Komatsu Ltd. | High-toughness wear-resistant steel |
| US7422643B2 (en) | 2003-03-11 | 2008-09-09 | Komatsu Ltd. | Rolling element and method of producing the same |
| US7544255B2 (en) | 2003-03-04 | 2009-06-09 | Komatsu Ltd. | Rolling element |
| US7905968B2 (en) * | 2008-04-30 | 2011-03-15 | Douglas G Bruce | Method of heat treating cultivating disc, coulter, and seed drill blades made from heat quenched boron steels, such that they can be roller re-edged and re-sharpened, and yet retain excellent toughness, hardness and wear characteristics, and are especially useful in dry sandy soils such as found in certain wheat growing regions |
| CN101988174A (en) * | 2010-12-06 | 2011-03-23 | 宝钢集团新疆八一钢铁有限公司 | Large-scale ball mill liner and heat treatment method thereof |
| CN105112789A (en) * | 2015-09-07 | 2015-12-02 | 宁波瑞国精机工业有限公司 | Hinge pin and machining method thereof |
| US11203803B2 (en) | 2015-09-18 | 2021-12-21 | Osaka University | Steel with high hardness and excellent toughness |
| CN114032464A (en) * | 2021-11-10 | 2022-02-11 | 泰尔重工股份有限公司 | High-performance shearing blade for wide and thick plates and manufacturing method thereof |
| CN114790760A (en) * | 2022-05-12 | 2022-07-26 | 山东丰汇设备技术有限公司 | Blade body, blade structure and bull-dozer suitable for silt is regional |
-
1991
- 1991-03-28 JP JP06479291A patent/JP3360687B2/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999031288A1 (en) * | 1997-12-15 | 1999-06-24 | Caterpillar Inc. | Improved hardness, strength, and fracture toughness steel |
| US6899774B2 (en) | 2001-07-12 | 2005-05-31 | Komatsu Ltd. | High-toughness wear-resistant steel |
| US7544255B2 (en) | 2003-03-04 | 2009-06-09 | Komatsu Ltd. | Rolling element |
| US7691212B2 (en) | 2003-03-04 | 2010-04-06 | Komatsu Ltd. | Rolling element and method of producing the same |
| US7422643B2 (en) | 2003-03-11 | 2008-09-09 | Komatsu Ltd. | Rolling element and method of producing the same |
| US7691213B2 (en) | 2003-03-11 | 2010-04-06 | Komatsu Ltd. | Case hardened gear and method of producing the same |
| US7905968B2 (en) * | 2008-04-30 | 2011-03-15 | Douglas G Bruce | Method of heat treating cultivating disc, coulter, and seed drill blades made from heat quenched boron steels, such that they can be roller re-edged and re-sharpened, and yet retain excellent toughness, hardness and wear characteristics, and are especially useful in dry sandy soils such as found in certain wheat growing regions |
| CN101988174A (en) * | 2010-12-06 | 2011-03-23 | 宝钢集团新疆八一钢铁有限公司 | Large-scale ball mill liner and heat treatment method thereof |
| CN105112789A (en) * | 2015-09-07 | 2015-12-02 | 宁波瑞国精机工业有限公司 | Hinge pin and machining method thereof |
| US11203803B2 (en) | 2015-09-18 | 2021-12-21 | Osaka University | Steel with high hardness and excellent toughness |
| CN114032464A (en) * | 2021-11-10 | 2022-02-11 | 泰尔重工股份有限公司 | High-performance shearing blade for wide and thick plates and manufacturing method thereof |
| CN114790760A (en) * | 2022-05-12 | 2022-07-26 | 山东丰汇设备技术有限公司 | Blade body, blade structure and bull-dozer suitable for silt is regional |
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|---|---|
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