JP2012246564A - Wear-resistant low-alloy cast steel - Google Patents
Wear-resistant low-alloy cast steel Download PDFInfo
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- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 19
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 17
- 239000000956 alloy Substances 0.000 title claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 48
- 230000000171 quenching effect Effects 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 238000000265 homogenisation Methods 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000006227 byproduct Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 6
- 229910052748 manganese Inorganic materials 0.000 abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 230000007423 decrease Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
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Abstract
Description
本発明は鉱山、砕石、セメントなどの業界における各種破砕機、搬送ラインなどの機械装置に使用される耐摩耗低合金鋳鋼鋳物に関する。さらに詳しくは、高硬度と高靭性を両立させるため、材料組成および熱処理の最適化に関する。 TECHNICAL FIELD The present invention relates to a wear-resistant low alloy cast steel casting used in various crushing machines in the industries such as mine, crushed stone, and cement, and machine equipment such as a conveyance line. More specifically, the present invention relates to optimization of material composition and heat treatment in order to achieve both high hardness and high toughness.
鉱山、砕石、セメント、鉄鋼、リサイクルなどに代表される業界においては、各種鉱石などを粉砕する破砕機、分級機、搬送装置等が使用されており、これらの装置の各種部品には高い耐摩耗性と靭性が求められている。 In the industry represented by mines, crushed stones, cement, steel, recycling, etc., crushers, classifiers, conveyors, etc. that pulverize various ores are used, and various parts of these devices have high wear resistance. And toughness is required.
こうした要求に対応する材料として、歴史的には高マンガン鋳鋼が最初に用いられるようになり、次第に普及してきた経緯がある。高マンガン鋳鋼の金属組織は均一なオーステナイトであり、極めて高い靭性を有するため破損に対する危険性が低い利点がある一方、加工硬化による表面硬さはHRC30〜40程度であり、比較的摩耗の進行が早いという問題があった。 Historically, high manganese cast steel was first used as a material to meet these demands, and has gradually become popular. The metal structure of high manganese cast steel is uniform austenite and has an extremely high toughness, so it has the advantage of low risk of breakage, while the surface hardness by work hardening is around HRC30-40, and the progress of wear is relatively high. There was a problem of being quick.
このため、さらに耐摩耗性を要求される用途や部品に対しては、各種低合金鋳鋼が用いられるようになった。ここで、低合金鋳鋼とは炭素鋼に合金元素としてCrやMo、Niなどを合計で概略10mass%（以下%と略す）以下添加して焼入れ性や靭性を向上した材料であって、構造用高張力炭素鋼及び低合金鋼鋳鋼としてJISやASTMで規格化されている。 For this reason, various low alloy cast steels have come to be used for applications and parts that further require wear resistance. Here, low alloy cast steel is a material that has improved hardenability and toughness by adding approximately 10 mass% (hereinafter abbreviated as%) or less of alloy elements such as Cr, Mo, and Ni to carbon steel. It is standardized by JIS and ASTM as high-strength carbon steel and low alloy steel cast steel.
その中でも高い焼入性と靭性を有する典型的な材料として、ＪＩＳ Ｇ5111に規格化されているSCNCrM2材（Ｃ：0.25〜0.35%、Si：0.30〜0.60、Mn：0.90〜1.50、Ni：1.60〜2.00、Cr：0.30〜0.90、Mo：0.15〜0.35）がある。焼入処理の冷却方法としては焼割れ防止のため通常油焼入が行われている。そして構造用には550〜650℃で焼戻を行うが、耐摩耗性を必要とする用途には200℃程度の低温焼戻で使用されている。その場合には、肉厚1インチ未満で硬さ50HRC、衝撃値30J/cm2程度が得られる。
以上のことが従来技術として知られている
Among them, as a typical material having high hardenability and toughness, SCNCrM2 material standardized in JIS G5111 (C: 0.25 to 0.35%, Si: 0.30 to 0.60, Mn: 0.90 to 1.50, Ni: 1.60 to 2.00, Cr: 0.30-0.90, Mo: 0.15-0.35). As a quenching cooling method, oil quenching is usually performed to prevent quench cracking. For structural use, tempering is performed at 550 to 650 ° C., but for applications that require wear resistance, it is used at a low temperature of about 200 ° C. In that case, a thickness of less than 1 inch, a hardness of 50 HRC and an impact value of about 30 J / cm 2 can be obtained.
The above is known as prior art
しかし、1インチ以上の肉厚を持つ部品で芯部まで高硬度を得ようとする場合にはSCNCrM2でも焼入性が不足し、芯部硬さが45HRC以下に低下してしまう。そこで芯部まで高硬度にするために焼入処理を水焼入にすると、焼割れの危険性が増加するという問題点（課題）があった。
ここで、焼割れとは、焼入れ工程で発生する割れと、焼入れ後に室温に放置した状態で発生する置き割れを含む。
However, when trying to obtain high hardness up to the core with a part having a thickness of 1 inch or more, SCNCrM2 has insufficient hardenability and the core hardness decreases to 45HRC or less. Therefore, there is a problem (problem) that the risk of quenching cracks increases when the quenching process is water quenching in order to achieve high hardness up to the core.
Here, quench cracking includes cracks that occur in the quenching process and cracks that occur when left at room temperature after quenching.
そこで、本発明は、上記の問題（課題）に鑑みて成されたもので、肉厚が1インチ以上である鋳鋼製品において、高硬度を確保するために水焼入れを施しても焼割れの発生が軽減可能な合金組成について最適化を図ることによって、高靭性を確保しながら同時にHRC45〜53の硬さを実現し、耐摩耗性を向上する耐摩耗低合金鋳鋼を提供することを目的とする Therefore, the present invention has been made in view of the above problems (problems), and in a cast steel product having a wall thickness of 1 inch or more, even if water quenching is performed in order to ensure high hardness, occurrence of quench cracks occurs. The objective is to provide a wear-resistant low alloy cast steel that achieves HRC45-53 hardness and improves wear resistance while ensuring high toughness by optimizing the alloy composition that can reduce
上記の課題を解決するためにするために、本発明の耐摩耗低合金鋳鋼は、Mass%でC 0.30〜0.35、Si 0.30〜0.60、Mn 0.90〜1.50、Cr 0.91〜1.50、Ni 1.60〜1.90、Mo 0.20〜0.30、P 0.05以下、S 0.05以下、および残部がFeと不可避不純物からなり、製品肉厚が1インチ以上、硬さがHRC45〜53、シャルピー衝撃値（Uノッチ）20〜40J／cm2であることを特徴とする。 In order to solve the above problems, the wear-resistant low alloy cast steel of the present invention has a mass% of C 0.30 to 0.35, Si 0.30 to 0.60, Mn 0.90 to 1.50, Cr 0.91 to 1.50, Ni 1.60 to 1.90, Mo 0.20 ~ 0.30, P 0.05 or less, S 0.05 or less, balance is Fe and inevitable impurities, product thickness is 1 inch or more, hardness is HRC45 ~ 53, Charpy impact value (U notch) 20 ~ 40J / cm2 It is characterized by being.
また、1000〜1100℃に加熱保持した後炉冷する均質化処理工程と、850〜950℃に加熱保持した後水焼入れを行う焼入れ工程と、150〜280℃に加熱保持した後室温まで炉冷する焼戻し工程からなる熱処理を施すことを特徴とする。 In addition, a homogenization treatment step of heating and holding at 1000 to 1100 ° C. and then cooling to the furnace, a quenching step of heating and holding at 850 to 950 ° C. and water quenching, and a heating and holding at 150 to 280 ° C. and then cooling to the room temperature A heat treatment comprising a tempering step is performed.
本発明は肉厚が1インチ以上である鋳鋼製品において、焼割れの発生が軽減可能な合金組成および熱処理方法について最適化を図ったので）、耐摩耗性と靭性、すなわち、硬さがHRC45〜53、シャルピー衝撃値（Uノッチ）20〜40J／cm2である耐摩耗低合金鋳鋼を提供することが可能となった。
Since the present invention has been optimized for an alloy composition and a heat treatment method capable of reducing the occurrence of burning cracks in cast steel products having a wall thickness of 1 inch or more), wear resistance and toughness, that is, hardness is HRC45 ~ 53. It became possible to provide a wear-resistant low alloy cast steel having a Charpy impact value (U notch) of 20 to 40 J / cm2.
つぎに本発明の実施例を説明するが、本発明はかかる実施例に限定されるものではない。
請求項1に記載した化学成分を設定した理由を以下に説明する。
１） C ：0.30〜0.35%
Cは焼入れ硬さを支配する重要な元素であり、HRC45〜53の硬さを得るために0.30〜0.35%とした。0.30%未満ではHRC45以上の硬さが得られず、0.35%を超えると焼割れが増加するため上記の範囲とした。
Next, examples of the present invention will be described, but the present invention is not limited to such examples.
The reason why the chemical component described in claim 1 is set will be described below.
1) C: 0.30 to 0.35%
C is an important element that controls the quenching hardness, and is 0.30 to 0.35% in order to obtain a hardness of HRC45 to 53. If it is less than 0.30%, a hardness of HRC45 or more cannot be obtained, and if it exceeds 0.35%, fire cracking increases, so the above range is set.
２） Si ：0.30〜0.60％
Siの焼入れ性に対する効果は小さいが、脱酸および湯流れ性を確保するうえで重要であり、0.30%未満では脱酸効果が不十分であり鋳物製品内部のガス欠陥が増加し、0.60%を超えると偏析が増加し靭性が低下するため上記の範囲とした。
2) Si: 0.30 to 0.60%
Although the effect on the hardenability of Si is small, it is important to ensure deoxidation and hot-water flow.If it is less than 0.30%, the deoxidation effect is insufficient, and gas defects inside the cast product increase. If it exceeds, segregation increases and toughness decreases, so the above range was adopted.
３） Mn ：0.90〜1.50%
Mnは鋼の焼入れ性を向上する効果が最も高い元素であり、HRC45〜53の硬さを安定して実現するために0.90〜1.50%とした。0.90%未満では特に1インチを超える肉厚製品に対して上記の硬さを安定して確保できず、1.5%を超えると偏析を生じて靭性（シャルピー衝撃値）が低下するため上記の範囲とした。
3) Mn: 0.90 to 1.50%
Mn is the element having the highest effect of improving the hardenability of steel, and is set to 0.90 to 1.50% in order to stably realize the hardness of HRC45 to 53. If it is less than 0.90%, the above hardness cannot be secured stably especially for thick products exceeding 1 inch, and if it exceeds 1.5%, segregation occurs and the toughness (Charpy impact value) decreases. did.
４） Cr ：0.91〜1.50%
CrはMn、Moに次いで焼入れ性向上効果が高い元素であると同時に結晶粒を微細化して靭性を向上して耐焼割れ性を向上するため0.91〜1.50%とした。0.91%未満では効果が不十分で芯部硬さが45HRC以下に低下し、1.50%を超えると炭化物が増加して靭性が低下するため上記の範囲とした。
4) Cr: 0.91-1.50%
Cr is an element having the highest effect of improving hardenability after Mn and Mo, and at the same time, the grain size is reduced to 0.91 to 1.50% in order to improve the toughness and improve the cracking resistance. If the content is less than 0.91%, the effect is insufficient, and the core hardness decreases to 45HRC or less. If the content exceeds 1.50%, carbides increase and the toughness decreases, so the above range is set.
５） Ni ：1.60〜1.90%
Niは靭性を向上する効果が最も高い元素であり、特に1インチを超える肉厚製品に対してシャルピー衝撃値20〜40J／cm2を実現するため、1.60%未満では効果が不十分であり、1.90%を超えると衝撃値が飽和するため上記の範囲とした。
5) Ni: 1.60 to 1.90%
Ni is the element with the highest effect of improving toughness. Especially, it achieves a Charpy impact value of 20-40 J / cm2 for thick products exceeding 1 inch, so if it is less than 1.60%, the effect is insufficient. Since the impact value is saturated when the content exceeds%, the above range is adopted.
６） Mo ：0.20〜0.30%
MoはMnに次いで焼入れ性向上効果が高い元素であると同時に焼戻し軟化抵抗を高める作用があり0.20〜0.30%とした。0.20%未満では効果が不十分であり、0.30%を超えると偏析を生じて靭性が若干低下するため上記の範囲とした。
6) Mo: 0.20 to 0.30%
Mo is an element having the highest effect of improving hardenability next to Mn, and at the same time has an effect of increasing the temper softening resistance, and is set to 0.20 to 0.30%. If the content is less than 0.20%, the effect is insufficient. If the content exceeds 0.30%, segregation occurs and the toughness slightly decreases, so the above range is adopted.
７） PおよびS ：0.05%以下
鋼にとっては靭性を低下させる有害元素であるため0.05%以下とした。
7) P and S: 0.05% or less Since it is a harmful element that lowers toughness for steel, it was made 0.05% or less.
製品肉厚が1インチ未満の場合は、SCNCrM2などの従来材料でも焼割れの危険性は低く、HRC45〜53の硬さとシャルピー衝撃値（Uノッチ）20〜40J／cm2を得ることができるが、1インチ以上になると芯部硬さが低下する。SCNCrM2などの従来材料は油焼入れを基本としており、水焼入れと比較して冷却速度が遅いことから、肉厚が増加するほど焼入れ硬さが低下する。また、冷却速度を上げるため水焼入れを実施すると顕著に焼割れが増加する。 If the product wall thickness is less than 1 inch, the risk of fire cracking is low even with conventional materials such as SCNCrM2, and hardness of HRC45 to 53 and Charpy impact value (U notch) of 20 to 40 J / cm2 can be obtained. When it becomes 1 inch or more, the core hardness decreases. Conventional materials such as SCNCrM2 are based on oil quenching, and since the cooling rate is slower than water quenching, the quenching hardness decreases as the wall thickness increases. Moreover, if water quenching is carried out in order to increase the cooling rate, quench cracks will increase remarkably.
請求項2に記載した熱処理工程について以下に説明する。
１） 均質化処理工程
鋳造後の金属組織は凝固時のデンドライト組織が粗大に発達して非常に不均一であると共に化学成分の偏析が著しい。また、鋳造応力を内蔵している。このため、焼入れ工程に先立ち、完全なオーステナイト組織となる温度に加熱して成分、組織を均質化すると共に鋳造応力を開放する必要がある。均質化処理の温度が1000℃未満では効果が不十分であり、1100℃を超えると結晶粒が成長して粗大化するため1000〜1100℃とした。均質化処理温度に保持する時間は製品の肉厚に応じて適宜設定すればよい。また、冷却は熱処理による応力が極力残留しないように炉冷することが好ましい。
The heat treatment step described in claim 2 will be described below.
1) Homogenization process The cast metal structure is very uneven due to the coarse dendrite structure during solidification and the segregation of chemical components is remarkable. It also incorporates casting stress. For this reason, prior to the quenching step, it is necessary to heat to a temperature at which a complete austenite structure is obtained, to homogenize the components and structure, and to release the casting stress. If the temperature of the homogenization treatment is less than 1000 ° C., the effect is insufficient, and if it exceeds 1100 ° C., the crystal grains grow and become coarse, so the temperature was set to 1000 to 1100 ° C. What is necessary is just to set suitably the time hold | maintained at the homogenization process temperature according to the thickness of a product. The cooling is preferably performed in the furnace so that the stress due to the heat treatment does not remain as much as possible.
２） 焼入れ工程
均質化処理工程に引続いて、850〜950℃に昇温保持した後、水中に投入して水焼入れを実施する。焼入れ温度が850℃未満では均一なオーステナイト組織にすることができないため靭性が低下し、950℃を超えると結晶粒が粗大化すると共に焼入れ硬さが低下する。焼入れ温度に保持する時間は製品の肉厚に応じて適宜設定すればよい。また、形状が複雑で肉厚が不均一な製品の場合は、Ms点＋50℃程度の温度まで冷却した後、水中から引上げて放冷するなどの手段を講じることが好ましい。
2) Quenching process Following the homogenization treatment process, the temperature is maintained at 850 to 950 ° C. and then poured into water to perform water quenching. If the quenching temperature is less than 850 ° C., a uniform austenite structure cannot be obtained, so that the toughness is lowered. What is necessary is just to set suitably the time hold | maintained at quenching temperature according to the thickness of a product. In addition, in the case of a product having a complicated shape and a non-uniform thickness, it is preferable to take measures such as cooling to a temperature of about Ms point + 50 ° C. and then pulling it out of water and allowing it to cool.
３） 焼戻し工程
焼入れ工程に引続き、焼入れによる応力を緩和すると共に硬さと靭性を調整するため焼戻しを行う。焼戻し工程では、150〜280℃に昇温保持した後、室温まで炉冷する。焼戻し温度が150℃未満では靭性を回復する効果が不十分であり、280℃を超えると低温焼戻し脆性が発生する危険性が増大する。
3) Tempering process Following the quenching process, tempering is performed to relieve stress due to quenching and adjust hardness and toughness. In the tempering process, the temperature is maintained at 150 to 280 ° C., and then the furnace is cooled to room temperature. If the tempering temperature is less than 150 ° C, the effect of restoring toughness is insufficient, and if it exceeds 280 ° C, the risk of low temperature tempering brittleness increases.
本発明による耐摩耗低合金鋳鋼は、製品肉厚が1インチ以上であっても水焼入れを実施することで高い芯部硬さを確保することが可能であり、冷却速度が早い水焼入れを実施しても焼割れが発生しにくい特徴を有する。従って、製品肉厚が増加してもHRC45〜53の硬さとシャルピー衝撃値（Uノッチ）20〜40J／cm2を安定して得ることが可能である。なお、HRC53を超える硬さが必要な場合は、C量をさらに増加する必要があり、その領域では靭性が急激に低下するため、本発明の範囲外である。 Wear-resistant low alloy cast steel according to the present invention can ensure high core hardness by water quenching even if the product thickness is 1 inch or more, and water quenching with a fast cooling rate is performed. Even if it has the feature that it is hard to generate a burning crack. Therefore, even if the product thickness increases, it is possible to stably obtain the hardness of HRC45 to 53 and the Charpy impact value (U notch) of 20 to 40 J / cm2. In addition, when the hardness exceeding HRC53 is required, it is necessary to further increase the amount of C, and in that region, the toughness is drastically decreased, and therefore it is out of the scope of the present invention.
本発明の化学成分は、SCNCrM2などの従来材料と比較して、焼入れ性向上と靭性改善効果の高いCrを高く設定することにより、水焼入れを実施して芯部まで高硬度を確保し、耐焼割れ性も高いという画期的な特性を実現したものである。 Compared to conventional materials such as SCNCrM2, the chemical composition of the present invention is set to high Cr, which has a high effect of improving hardenability and toughness. It realizes an epoch-making characteristic of high cracking properties.
以下、本実施例に基づき発明を説明する。 Hereinafter, the present invention will be described based on this embodiment.
表1に示す化学成分により、ＪＩＳ G5502（ISO 1083）に定められた1インチ（B号）、2インチ（C号）、3インチ（D号）のYブロックを鋳造した。鋳造したYブロックの数は、表2に示す実施例、比較例に対して各々5個製作した。比較例1の化学成分はSCNCrM2である。
硬さおよびシャルピー衝撃値は、熱処理を実施した各々のYブロックから切り出した試験片を用いて評価した。
硬さ測定は、ロックウェル硬度計のCスケール（HRC）を使用し、測定方法はＪＩＳ Z2245（ISO 6508）に従って実施した。
シャルピー衝撃値の測定は、シャルピー衝撃試験機を使用し、ＪＩＳ Z2242（ISO 83）に従って実施した。試験片形状は、ＪＩＳ Z2202の2ミリUノッチ試験片を用いた。
実施例１〜3のYブロックは、1070℃で均質化処理を実施した後、890℃に加熱保持してから水焼入れを行い、その後、230℃で焼戻しした。
比較例1〜5のYブロックは、実施例1〜3と同じ条件で熱処理を行った。
1-inch (B), 2-inch (C), and 3-inch (D) Y blocks specified in JIS G5502 (ISO 1083) were cast according to the chemical composition shown in Table 1. The number of cast Y blocks was 5 for each of the examples and comparative examples shown in Table 2. The chemical component of Comparative Example 1 is SCNCrM2.
The hardness and Charpy impact value were evaluated using test pieces cut out from each Y block subjected to heat treatment.
Hardness was measured using a Rockwell hardness scale C scale (HRC), and the measurement method was performed in accordance with JIS Z2245 (ISO 6508).
The Charpy impact value was measured using a Charpy impact tester according to JIS Z2242 (ISO 83). As the shape of the test piece, a 2 mm U-notch test piece of JIS Z2202 was used.
The Y blocks of Examples 1 to 3 were homogenized at 1070 ° C., heated and held at 890 ° C., then subjected to water quenching, and then tempered at 230 ° C.
The Y blocks of Comparative Examples 1 to 5 were heat-treated under the same conditions as in Examples 1 to 3.
表1
表2
table 1
Table 2
実施例1〜3に示すように、本発明の化学成分（成分1）では、試験片の肉厚が1インチから3インチに増加しても硬さの低下が少なく、かつ30J／cm2以上の高いシャルピー衝撃値が得られた。さらに、水焼入れを実施しても焼割れの発生が無く、耐焼割れ性に優れた材料であることが確認された。 As shown in Examples 1 to 3, with the chemical component (component 1) of the present invention, there is little decrease in hardness even when the thickness of the test piece is increased from 1 inch to 3 inches, and 30 J / cm 2 or more. A high Charpy impact value was obtained. Furthermore, it was confirmed that even if water quenching was performed, there was no occurrence of fire cracking and the material was excellent in fire cracking resistance.
硬さおよびシャルピー衝撃値は、熱処理を実施した各々のYブロックから切り出した試験片を用いて評価した。
硬さ測定は、ロックウェル硬度計のCスケール（HRC）を使用し、測定方法はＪＩＳ Z2245（ISO 6508）に従って実施した。
シャルピー衝撃値の測定は、シャルピー衝撃試験機を使用し、ＪＩＳ Z2242（ISO 83）に従って実施した。試験片形状は、ＪＩＳ Z2202の2ミリUノッチ試験片を用いた。
The hardness and Charpy impact value were evaluated using test pieces cut out from each Y block subjected to heat treatment.
Hardness was measured using a Rockwell hardness scale C scale (HRC), and the measurement method was performed in accordance with JIS Z2245 (ISO 6508).
The Charpy impact value was measured using a Charpy impact tester according to JIS Z2242 (ISO 83). As the shape of the test piece, a 2 mm U-notch test piece of JIS Z2202 was used.
実施例1〜3のYブロックは、1070℃で均質化処理を実施した後、890℃に加熱保持してから水焼入れを行い、その後、230℃で焼戻しした。比較例1〜5のYブロックは、実施例1〜3と同じ条件で熱処理を行った。 The Y blocks of Examples 1 to 3 were homogenized at 1070 ° C., heated and held at 890 ° C., then subjected to water quenching, and then tempered at 230 ° C. The Y blocks of Comparative Examples 1 to 5 were heat-treated under the same conditions as in Examples 1 to 3.
実施例1〜3に示すように、本発明の化学成分（成分1）では、試験片の肉厚が1インチから3インチに増加しても硬さの低下が少なく、かつ30J／cm2以上の高いシャルピー衝撃値が得られた。さらに、水焼入れを実施しても焼割れの発生が無く、耐焼割れ性に優れた材料であることが確認された。 As shown in Examples 1 to 3, with the chemical component (component 1) of the present invention, there is little decrease in hardness even when the thickness of the test piece is increased from 1 inch to 3 inches, and 30 J / cm 2 or more. A high Charpy impact value was obtained. Furthermore, it was confirmed that even if water quenching was performed, there was no occurrence of fire cracking and the material was excellent in fire cracking resistance.
比較例1は、成分2に示す化学成分（SCNCrM2）で1インチYブロックを製作して油焼入れを実施した結果であるが、同じ肉厚である実施例1と比較して、硬さ、シャルピー衝撃値ともに低い値となった。また、焼入れを行ったYブロックにおいて5個中1個に焼割れが発生した。従って、水焼入れでは、さらに焼割れが増加すると考えられる。 Comparative Example 1 is the result of producing a 1-inch Y block with the chemical component (SCNCrM2) shown in Component 2 and performing oil quenching. Compared to Example 1 having the same wall thickness, hardness and Charpy were compared. Both impact values were low. In addition, quenching occurred in one of the five blocks in the Y block that had been quenched. Therefore, it is considered that the quench cracking further increases in the water quenching.
比較例2、3は、2インチYブロックを製作して油焼入れ、および水焼入れを実施した結果であるが、いずれも同じ肉厚である実施例2と比較して、硬さ、シャルピー衝撃値ともに低い値となった。また、油入れを行ったYブロックにおいて5個中2個に焼割れが発生し、水焼入れでは5個中3個に焼割れが発生した。 Comparative Examples 2 and 3 are the results of producing a 2-inch Y block and performing oil quenching and water quenching, both of which are the same thickness as in Example 2, hardness, Charpy impact value Both were low. In addition, two out of five pieces in the Y block that had been filled with oil had burn cracks, and three in five pieces had cracks in the water quench.
比較例4、5は、3インチYブロックを製作して油焼入れ、および水焼入れを実施した結果であるが、いずれも同じ肉厚である実施例3と比較して、硬さ、シャルピー衝撃値ともに低い値となった。また、油入れを行ったYブロックにおいて5個中2個に焼割れが発生し、水焼入れでは5個中4個に焼割れが発生した。 Comparative Examples 4 and 5 are the results of producing a 3-inch Y block and performing oil quenching and water quenching, both compared with Example 3 where the wall thickness is the same, hardness, Charpy impact value Both were low. In addition, in the Y block where the oil was filled, 2 out of 5 were cracked, and in the water quenching, 4 out of 5 were cracked.
以上のように、本発明の耐摩耗合金鋳鋼は耐焼割れ性に優れ、HRC45〜53の硬さとなるように熱処理を実施した場合でも焼割れが発生することなく、かつシャルピー衝撃値（Uノッチ）20〜40J／cm2の高靭性を確保することが可能であり、特に肉厚が1インチ以上の製品に対して好適に適用可能であることが確認された。 As described above, the wear-resistant alloy cast steel of the present invention is excellent in fire cracking resistance, and even when heat-treated so as to have a hardness of HRC45 to 53, no cracking occurs, and Charpy impact value (U notch) It was confirmed that high toughness of 20 to 40 J / cm 2 can be secured, and that it can be suitably applied particularly to products having a wall thickness of 1 inch or more.
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| CN107385157A (en) * | 2017-06-21 | 2017-11-24 | 安徽金越轴承有限公司 | A kind of bearing calcines quenching technical |
| JP2019184432A (en) * | 2018-04-11 | 2019-10-24 | 株式会社アーステクニカ | Nondestructive inspection method for high manganese cast steel |
| CN115386692A (en) * | 2022-09-26 | 2022-11-25 | 中国第一汽车股份有限公司 | Heat treatment method for improving hardness of low alloy steel |
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| CN102978537A (en) * | 2012-12-10 | 2013-03-20 | 张家港市鼎力铸钢有限公司 | Wear-resistant cast steel |
| CN104004965A (en) * | 2014-06-05 | 2014-08-27 | 通裕重工股份有限公司 | Steel for wind power main shaft and heat treatment method thereof |
| CN108570537A (en) * | 2018-04-27 | 2018-09-25 | 共享铸钢有限公司 | A kind of production method of high rigidity low-alloy cast steel part |
| CN112522621A (en) * | 2020-11-30 | 2021-03-19 | 自贡硬质合金有限责任公司 | Composite wear-resistant metal block and preparation method thereof |
| CN115652215B (en) * | 2022-11-14 | 2023-10-20 | 襄阳金耐特机械股份有限公司 | High-strength high-hardness fatigue-resistant cast steel |
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| CN115386692A (en) * | 2022-09-26 | 2022-11-25 | 中国第一汽车股份有限公司 | Heat treatment method for improving hardness of low alloy steel |
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