JPH01219145A - Steel for cutting tool having high strength and high toughness - Google Patents
Steel for cutting tool having high strength and high toughnessInfo
- Publication number
- JPH01219145A JPH01219145A JP4210288A JP4210288A JPH01219145A JP H01219145 A JPH01219145 A JP H01219145A JP 4210288 A JP4210288 A JP 4210288A JP 4210288 A JP4210288 A JP 4210288A JP H01219145 A JPH01219145 A JP H01219145A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- toughness
- hardness
- cutting tool
- tempering
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 239000012535 impurity Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005496 tempering Methods 0.000 abstract description 17
- 239000000203 mixture Substances 0.000 abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 abstract 2
- 229910052759 nickel Inorganic materials 0.000 abstract 2
- 229910052720 vanadium Inorganic materials 0.000 abstract 2
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は高強度、高靭性刃物用鋼に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to high strength and high toughness steel for cutlery.
具体的に説明すると、焼入れ及び焼戻し処理により、Ｈ
ＲＣ硬度５０〜５５の高硬度で、かつ、室温での２ｍｍ
Ｕノツチ衝撃エネルギーが５〜１０ｋｇｆ／ｃｉの値
が得られ、優れた耐磨耗性を有し、３００℃以下の使用
温度において苛酷な繰返し衝撃ｆＪを受け、かつ耐磨耗
性を要求されるシャープレード、シャーナイフ等特に深
部まで均一な１？−ｒ ｆｉを要求される大型刃物材料
あるいは工具用材料として使用することができる高強度
、高靭・ｔ’を刃物用鋼に関するものある。Specifically, by quenching and tempering treatment, H
High hardness with RC hardness of 50-55 and 2mm at room temperature
A U-notch impact energy value of 5 to 10 kgf/ci is obtained, and it has excellent abrasion resistance.It can be subjected to severe repeated impact fJ at operating temperatures of 300℃ or less, and requires abrasion resistance. Sharp blade, sharp knife, etc. 1 that is uniform especially deep? There are steels for cutlery with high strength, high toughness, and t' that can be used as materials for large cutlery or tools that require -r fi.
［従来の技術］
従来、スクラップシャー等大型の刃物用鋼には、３〜５
％Ｃｒ、Ｍｏ鋼あるいは３〜４％Ｎ ｉ −ＣｒＮ Ｍ
Ｏ１Ｖ鋼が用いられティるが、これらの工具鋼は、Ｈ
ＲＣ硬度が５０を超える高硬度においては靭性が不充分
であり、苛酷な衝撃荷重を受ける使用の下においては、
使用中の割れ、欠は等の事故が避けられなかった。その
ため、このような欠陥を改善した高強度、高靭性刃１勿
用鋼の出現が関係業界から強く要望されているところで
ある。[Conventional technology] Conventionally, steel for large cutlery such as scrap shears has a
%Cr, Mo steel or 3-4%N i -CrN M
Although O1V steel is used, these tool steels
When the RC hardness is higher than 50, the toughness is insufficient, and when used under severe impact loads,
Accidents such as cracks and chips during use were unavoidable. Therefore, there is a strong demand from related industries for the emergence of a high-strength, high-toughness blade 1-use steel that has improved these defects.
［発明が解決しようとする課題］
そこで、本発明は、このような要望にこたえ、この種の
用途に使用されている刃物用鋼における上記問題点を解
決し、焼入れ、および、焼戻し処理によりＨＲＣ硬度５
０〜５５の高硬度が得られ、かつ優れた靭性および耐磨
耗性を有し、３００℃以下の使用温度において苛酷な衝
撃荷重を受けるシャープレードあるいはシャーナイフ等
の大型刃物用材料として使用することができる高強度、
高靭性刃物用鋼を得ることを、その目的とするものであ
る。[Problems to be Solved by the Invention] In response to such demands, the present invention solves the above-mentioned problems in cutlery steel used for this type of application, and improves HRC by hardening and tempering treatments. Hardness 5
It has a high hardness of 0 to 55, has excellent toughness and abrasion resistance, and is used as a material for large blades such as sharp blades and sharp knives that are subjected to severe impact loads at operating temperatures of 300°C or less. can high strength,
The purpose is to obtain a high toughness steel for cutlery.
［課題を解決するための手段］
本発明は、この目的を達するために、従来、含Ｎｉ系高
靭性鋼の問題点であった３００〜５００℃の焼戻し温度
の範囲で靭性値が低下する現象（焼戻し脆性）を軽減す
るために、ＳｉおよびＭｏの添加が特に有効であるとい
う知見に基づき、材料の焼入性および耐磨耗性を損うこ
となく、２００〜５００℃の焼戻し温度の範囲で２ｍｍ
Ｕノツチ衝撃靭性値で４〜１０ｋｇｆ、ｍ／ＣＩｉの
値が得られる刃物用鋼として、次のような化学成分を有
することを特徴とするものである。[Means for Solving the Problems] In order to achieve this object, the present invention has developed a phenomenon in which the toughness value decreases in the tempering temperature range of 300 to 500°C, which has been a problem with conventional Ni-containing high-toughness steels. Based on the knowledge that the addition of Si and Mo is particularly effective in reducing tempering embrittlement (tempering brittleness), the tempering temperature range of 200 to 500°C can be achieved without impairing the hardenability and wear resistance of the material. 2mm
A steel for cutlery which can obtain a U-notch impact toughness value of 4 to 10 kgf, m/CIi, is characterized by having the following chemical components.
すなわち、本発明による刃物用鋼は、重量基準で
Ｃ０．４０％以上 ０．５５％以下
Ｓｉ １．２０％以上 ２．００％以下Ｍｎ ０
．２０％以上 ０．５０％以下Ｎｉ３．００％以上
５．００％以下Ｃｒ １．００％以上 ２．００
％以下Ｍｏ ０．４０％以上 １．３０％以下Ｖ
０．０５％以上 ０．５０％以下を含み、残部が
Ｆｅ及び通常の製造上の不可避的不純物から成るもので
ある。That is, the steel for cutlery according to the present invention has, on a weight basis, C 0.40% or more and 0.55% or less Si 1.20% or more and 2.00% or less Mn 0
．． 20% or more 0.50% or less Ni 3.00% or more
5.00% or less Cr 1.00% or more 2.00
% or lessMo 0.40% or more 1.30% or lessV
It contains 0.05% or more and 0.50% or less, with the remainder consisting of Fe and unavoidable impurities during normal manufacturing.
まず本発明による刃物用鋼は上記のような化学成分及び
成分範囲から成ることを特徴とするものであるが、本発
明において、これらの元素及びその成分範囲を上記のよ
うに選択した理由について説明する。First, the steel for cutlery according to the present invention is characterized by having the above-mentioned chemical composition and composition range.In the present invention, the reason why these elements and their composition ranges were selected as above will be explained. do.
Ｃ：Ｃは地に固溶して焼入性を確保すると共にＯｒ、Ｍ
ｏ、■と結合して高硬度の複合炭化物を形成し、地に分
散析出して材料の強度および耐磨耗性を付与することに
欠くことのできない元素である。C: C solidly dissolves in the ground to ensure hardenability, and also improves Or, M
It is an indispensable element because it combines with o and () to form a highly hard composite carbide, and is dispersed and precipitated in the ground to impart strength and wear resistance to the material.
このためには少くとも０．４０％が必要であるが、その
量が０．５５を超えると靭性が低下し、まだ熱間加工性
を害する。そこで、その下限を０．４０％、上限を０．
５５％と選定した。For this purpose, at least 0.40% is required, but if the amount exceeds 0.55, toughness decreases and hot workability is still impaired. Therefore, the lower limit is 0.40% and the upper limit is 0.40%.
It was selected as 55%.
Ｓｉ：Ｓｉは本発明の主要な元素の一つであって、地に
固溶して強度を高める他に、焼戻し過程における炭化物
の凝集、析出を遅らせ、焼戻し軟化抵抗性を高めると共
に、焼戻し脆性の現出を高温域に移行させる効果が大き
い。Si: Si is one of the main elements of the present invention, and in addition to increasing the strength by being solidly dissolved in the ground, it also delays the aggregation and precipitation of carbides during the tempering process, increases resistance to temper softening, and reduces temper brittleness. It has a great effect of shifting the appearance of
このためには最低１．２０％の添加を必要とするが２．
００％を超えると熱間加工性を害し、また高温加熱時の
表面脱炭を促進する。そこで、その下限を１．２０％、
上限を２．００％と選定した。For this purpose, it is necessary to add at least 1.20%, but 2.
If it exceeds 0.00%, hot workability will be impaired and surface decarburization will be promoted during high temperature heating. Therefore, the lower limit is 1.20%,
The upper limit was selected to be 2.00%.
Ｍｎ ：Ｍｎは地に固溶して強度および焼入性を改善し
、またＳと結合してその害を軽減するが０．５０％を超
えて含有すると靭性を低下させ、また残留オーステナイ
トを増加させる。そこで、その下限を０．２０％、上限
を０．５０％に選定した。Mn: Mn improves strength and hardenability when dissolved in the ground, and also combines with S to reduce its damage, but if it is contained in an amount exceeding 0.50%, it decreases toughness and increases retained austenite. let Therefore, the lower limit was selected to be 0.20%, and the upper limit was selected to be 0.50%.
Ｎｉ：Ｎｉは地に固溶して焼入性を改善し、また靭性を
向上させる。このためには最低３．００％の添加が必要
であるが、その量が５．００％を超えると残留オーステ
ナイトを増大させ、強度および靭性を低下させる。そこ
でその下限を３．００％、上限を５．００％に選定した
。Ni: Ni dissolves in solid solution to improve hardenability and toughness. For this purpose, it is necessary to add at least 3.00%, but if the amount exceeds 5.00%, retained austenite increases and strength and toughness decrease. Therefore, the lower limit was selected to be 3.00%, and the upper limit was selected to be 5.00%.
Ｃｒ二Ｃｒは地に固溶して焼入性を改善すると共に、焼
戻し過程において複合炭化物を形成し、焼戻し軟化抵抗
性および耐磨耗性を改善する。Cr2Cr improves hardenability by being dissolved in the ground, and also forms composite carbides in the tempering process to improve temper softening resistance and abrasion resistance.
このためには最低１．０θ％の含有が必要であるが、２
．００％を超えて含有すると残留オーステナイトを増大
させる。そこでその下限を１．００％、上限を２．００
％に選定した。For this purpose, a minimum content of 1.0θ% is required, but 2
．． If the content exceeds 00%, retained austenite will increase. Therefore, the lower limit is 1.00% and the upper limit is 2.00%.
%.
ＭＯ：ＭＯは地に固溶して焼入性を改善すると共に、複
合炭化物を形成して焼戻し軟化抵抗性および耐磨耗性を
改善し、また焼戻し脆性を軽減する効果も大きい。MO: MO improves hardenability by forming a solid solution in the ground, and also forms composite carbides to improve temper softening resistance and abrasion resistance, and is also highly effective in reducing temper brittleness.
このためには最低０．４０％の添加が必要であるが１．
３０％を超えて含有すると熱間加工性を害する。そこで
、その下限を０．４０％、上限を１．３０％に選定した
。For this purpose, it is necessary to add at least 0.40%, but 1.
If the content exceeds 30%, hot workability will be impaired. Therefore, the lower limit was selected to be 0.40% and the upper limit to 1.30%.
Ｖ：■は高硬度の複合炭化物を形成して耐磨耗性を改善
し、焼戻し軟化抵抗性を改善する。このためには最低０
．０５％の添加が必要であるが、高価でありまた０、
５０％を超えて含有すると熱間加工性を害し、靭性が低
下する。そこで、その下限を０．０５％、上限を０．５
０％に選定した。V: ■ forms a composite carbide with high hardness to improve wear resistance and temper softening resistance. For this, at least 0
．． It is necessary to add 0.5%, but it is expensive and
If the content exceeds 50%, hot workability will be impaired and toughness will decrease. Therefore, the lower limit is 0.05% and the upper limit is 0.5%.
It was selected as 0%.
以上、本発明鋼における各元素及びその含有範囲の選定
理由を説明したが、次に本発明の詳細な説明する。The reasons for selecting each element and its content range in the steel of the present invention have been explained above, and now the present invention will be explained in detail.
［実施例］
下記表に、本発明鋼の実施例である鋼と、比較鋼の化学
成分が示されている。[Example] The table below shows the chemical compositions of steels that are examples of the steel of the present invention and comparative steels.
添付図面の第１図には、表に示された本発明鋼と比較鋼
について焼戻し温度と硬度の関係、第２図には焼入れ、
焼戻し硬度と２ｍｍ Ｕノツチ衝撃エネルギーの関係、
第３図には同じく焼入れ、焼戻し硬度と抗折力の関係か
それぞれ示されている。Figure 1 of the attached drawings shows the relationship between tempering temperature and hardness for the inventive steel and comparative steel shown in the table, and Figure 2 shows the relationship between quenching and hardness.
Relationship between tempering hardness and 2mm U notch impact energy,
FIG. 3 also shows the relationship between quenching and tempering hardness and transverse rupture strength.
［発明の効果］
以上説明したように、本発明の鋼は、上記化学成分及び
成分範囲を有し、焼入れ、及び、２００〜５００’Ｃの
焼戻し処理により、１−ＩＲｃ硬度で５０〜５５の高硬
度が得られると共に、優れた靭性を有している。従って
３００℃前後以下の使用温度において苛酷な繰り返しの
衝撃力を受け、かつ耐磨耗性を要求される比較的大型の
シャープレード、シャーナイフ用材料おるいはパンチ、
ダイス、ピニオン、スピンドル、チゼル、ライナー、ス
プリング等に、最適の特性を発揮することかできるもの
であることは、明らかなところである。[Effects of the Invention] As explained above, the steel of the present invention has the above chemical composition and composition range, and has a 1-IRc hardness of 50 to 55 by quenching and tempering at 200 to 500'C. It has high hardness and excellent toughness. Therefore, materials for relatively large sharp blades, sharp knives, or punches that are subject to severe repeated impact forces at operating temperatures of around 300 degrees Celsius or lower and are required to have abrasion resistance.
It is clear that dies, pinions, spindles, chisels, liners, springs, etc. can exhibit optimum characteristics.
第１図は表に示された本発明鋼と比較鋼の焼戻し温度と
硬度の関係を示すグラフ、
第２図は焼入れ、焼戻し硬度と２ｍｍ Ｕノツチ衝撃エ
ネルギーの関係を示すグラフ、
第３図は焼入れ、焼戻し硬度と抗折力の関係を示すグラ
フである。Figure 1 is a graph showing the relationship between tempering temperature and hardness of the invention steel and comparative steel shown in the table. Figure 2 is a graph showing the relationship between quenching and tempering hardness and 2mm U-notch impact energy. It is a graph showing the relationship between quenching and tempering hardness and transverse rupture strength.
Claims (1)
から成ることを特徴とする耐磨耗性に優れた高強度、高
靭性刃物用鋼。[Claims] Based on weight: C 0.40% or more and 0.55% or less Si 1.20% or more and 2.00% or less Mn 0.20% or more and 0.50% or less Ni 3.00% or more and 5.00% or less Cr1 0.00% or more and 2.00% or less Mo0.40% or more and 1.30% or lessV0.05% or more and 0.50% or less, and the remainder consists of Fe and normal manufacturing inevitable impurities. A high-strength, high-toughness steel for cutlery with excellent wear resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63042102A JP2738537B2 (en) | 1988-02-26 | 1988-02-26 | High strength, high toughness steel for cutting tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63042102A JP2738537B2 (en) | 1988-02-26 | 1988-02-26 | High strength, high toughness steel for cutting tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01219145A true JPH01219145A (en) | 1989-09-01 |
| JP2738537B2 JP2738537B2 (en) | 1998-04-08 |
Family
ID=12626619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63042102A Expired - Fee Related JP2738537B2 (en) | 1988-02-26 | 1988-02-26 | High strength, high toughness steel for cutting tools |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2738537B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2036640A1 (en) * | 2007-09-13 | 2009-03-18 | Maryam Jaber Suliman Alhusain | Rotary tool |
| WO2010092067A1 (en) * | 2009-02-10 | 2010-08-19 | Gebr. Schmachtenberg Gmbh | Steel alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57207158A (en) * | 1981-06-12 | 1982-12-18 | Nippon Chiyuutankou Kk | Alloy for spindle and coupling of rolling mill |
-
1988
- 1988-02-26 JP JP63042102A patent/JP2738537B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57207158A (en) * | 1981-06-12 | 1982-12-18 | Nippon Chiyuutankou Kk | Alloy for spindle and coupling of rolling mill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2036640A1 (en) * | 2007-09-13 | 2009-03-18 | Maryam Jaber Suliman Alhusain | Rotary tool |
| WO2010092067A1 (en) * | 2009-02-10 | 2010-08-19 | Gebr. Schmachtenberg Gmbh | Steel alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2738537B2 (en) | 1998-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |