JPH0754099A - Steel for machine structure use excellent in machinability - Google Patents
Steel for machine structure use excellent in machinabilityInfo
- Publication number
- JPH0754099A JPH0754099A JP19753593A JP19753593A JPH0754099A JP H0754099 A JPH0754099 A JP H0754099A JP 19753593 A JP19753593 A JP 19753593A JP 19753593 A JP19753593 A JP 19753593A JP H0754099 A JPH0754099 A JP H0754099A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- machinability
- less
- effect
- machine structural
- 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.)
- Withdrawn
Links
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052738 indium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 229910052745 lead Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 20
- 238000005204 segregation Methods 0.000 abstract description 5
- 229910052796 boron Inorganic materials 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 229910000746 Structural steel Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910018404 Al2 O3 Inorganic materials 0.000 description 3
- 229910000915 Free machining steel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052714 tellurium Inorganic materials 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車，産業機械，電
子部品等の分野において、ギア，シャフト，ボルト，ピ
ン，フレーム等の部品の素材として適用される機械構造
用鋼に関し、特に被削性を向上させた機械構造用鋼に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical structural steel used as a material for parts such as gears, shafts, bolts, pins and frames in the fields of automobiles, industrial machines, electronic parts, etc. The present invention relates to a machine structural steel having improved properties.
【０００２】[0002]
【従来の技術】上記の様な各種部品の素材として用いら
れる機械構造用鋼（ＪＩＳ記号：ＳＣ，ＳＮＣ，ＳＮＣ
Ｍ，ＳＣｒ，ＳＣＭ等）において、被削性を向上させる
手段としては、Ｓ，Ｐｂ，Ｃａ等の被削性向上元素を添
加する方法が知られている。そのうちＰｂを添加したＰ
ｂ快削鋼は、被削性特に切り屑処理性に優れ、切削工程
の自動化に貢献できるので、機械構造用部品の素材とし
て広く使用されてきた。しかしながら、Ｐｂの添加は環
境衛生上で問題があった。2. Description of the Related Art Steels for machine structures (JIS symbols: SC, SNC, SNC) used as materials for various parts as described above.
In M, SCr, SCM, etc.), a method of adding a machinability improving element such as S, Pb, Ca is known as a means for improving the machinability. P of which Pb was added
b) Free-cutting steel has been widely used as a material for machine structural parts because it has excellent machinability, especially chip disposability, and can contribute to automation of the cutting process. However, the addition of Pb has a problem in environmental hygiene.
【０００３】そこでＰｂに替わる有能な被削性向上元素
としてＩｎが注目され、Ｉｎを添加した快削鋼が、フラ
ンス特許Ｃ２２Ｃ３９１５４号（１９７４年），特開昭
６２−２０８５３号，同６２−３３７４３号等に開示さ
れている。しかしながらＩｎは、高価であるにも拘らず
それに見合っただけの被削性向上効果が得られておら
ず、またＩｎ単独で粒界に偏析して熱間加工性や疲労強
度に悪影響を及ぼす等の新たな問題があり、Ｉｎを添加
した快削鋼の適用範囲は限られているのが実情である。Therefore, In has attracted attention as an effective machinability-improving element which replaces Pb, and free-cutting steel containing In is known as French Patent C22C39154 (1974), JP-A-62-20853, and JP-A-62-12083. No. 33743 is disclosed. However, despite the fact that In is expensive, it does not have a machinability improving effect commensurate with it, and In segregates at grain boundaries by In alone and adversely affects hot workability and fatigue strength. In fact, the application range of free-cutting steel containing In is limited.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記の様な技
術的課題を解決するためになされたものであって、その
目的は、Ｉｎの添加効果を十分に発揮させ被削性に優れ
た機械構造用鋼を提供することにある。また本発明の他
の目的は、Ｉｎ添加に伴うＩｎの粒界偏析を防止し、熱
間加工性や疲労強度の低下を極力抑制することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the technical problems as described above, and the purpose thereof is to sufficiently bring out the effect of adding In and to provide excellent machinability. To provide steel for machine structural use. Another object of the present invention is to prevent the grain boundary segregation of In due to the addition of In and suppress the deterioration of hot workability and fatigue strength as much as possible.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成し得た本
発明の機械構造用鋼とは、Ｃ：０．０５〜０．６％，Ｓ
ｉ：０．０３〜１％，Ｍｎ：０．１〜２％，Ｓ：０．０
０５〜０．１２％，Ｉｎ：０．００１〜０．１％，Ｎ：
０．００３〜０．０２％を夫々含有すると共に、必要に
よってＢ：０．０００５〜０．０３％を含有し、Ｏ：
０．００２％以下およびＡｌ2 Ｏ3 ：０．００２％以下
に夫々抑制してなり、残部Ｆｅおよび不可避不純物より
なる点に要旨を有するものである。[Means for Solving the Problems] The steel for machine structural use of the present invention which has achieved the above-mentioned object is C: 0.05 to 0.6%, S
i: 0.03 to 1%, Mn: 0.1 to 2%, S: 0.0
05-0.12%, In: 0.001-0.1%, N:
0.003 to 0.02%, respectively, and if necessary, B: 0.0005 to 0.03%, and O:
0.002% or less and Al 2 O 3: made by respectively suppressed to 0.002% or less, and has a gist in that consisting of the balance Fe and unavoidable impurities.
【０００６】[0006]
【作用】本発明者らは、鋼中のＩｎの挙動が鋼材の特性
に及ぼす影響について詳細に検討した。その結果、Ｉｎ
はＡｌ2 Ｏ3 等の酸化物系介在物の周辺に付着し、これ
がＩｎ添加による被削性（特に切り屑処理性）向上効果
を半減させるのではないかとの知見が得られた。そこで
本発明者らは、鋼中の酸化物系介在物（特にＡｌ 2 Ｏ
3 ）を極力低減させれば、Ｉｎの添加効果が著しく発揮
されて切り屑処理性が著しく向上するのではないかと考
え、その為には鋼中のＯおよびＡｌ2 Ｏ3 をできるだけ
低減させることが有効であることを見出し、本発明を完
成した。また鋼中のＯやＡｌ2 Ｏ3 を低減することによ
って、疲労強度を向上することができることもわかっ
た。尚上記「鋼中のＯ」とは、Ａｌ2 Ｏ3 を構成するＯ
も含む意味である。The present inventors have found that the behavior of In in steel is a characteristic of the steel material.
The effects on the above were examined in detail. As a result, In
Is Al2 O3 Adheres around oxide inclusions such as
Improves the machinability (especially chip disposability) by adding In
It has been found that it may be halved. Therefore
The present inventors have found that oxide-based inclusions in steel (particularly Al 2 O
3 ) Is reduced as much as possible, the effect of adding In is remarkably exhibited.
It is thought that this will significantly improve the chip disposability.
Well, for that purpose, O and Al in steel2 O3 As much as possible
The present invention has been completed by finding that it is effective to reduce
I made it. In addition, O and Al in steel2 O3 By reducing
I also found that fatigue strength can be improved.
It was The above "O in steel" means Al2 O3 Composing O
Is also meant to include.
【０００７】本発明は、基本的に鋼中のＯやＡｌ2 Ｏ3
をできるだけ低減することを趣旨とするものであるが、
Ｉｎは単独で粒界に偏析するという不都合を回避するに
は、特にＢの添加が有効であることを見出した。即ち、
Ｉｎを添加した鋼材に所定量のＢを添加することによっ
て、Ｉｎの粒界偏析を抑制し、熱間加工性や疲労強度を
更に向上することができたのである。本発明における合
金成分の添加理由および組成範囲限定理由は、次の通り
である。The present invention is basically applied to O and Al 2 O 3 in steel.
The purpose is to reduce
It has been found that the addition of B is particularly effective in avoiding the disadvantage that In segregates at the grain boundaries by itself. That is,
By adding a predetermined amount of B to the steel material containing In, grain boundary segregation of In could be suppressed, and hot workability and fatigue strength could be further improved. The reason for adding the alloy components and the reason for limiting the composition range in the present invention are as follows.
【０００８】Ｃ：０．０５〜０．６％ Ｃは機械構造用鋼として必要な強度を確保するために必
要な元素であり、そのためには０．０５％以上含有させ
る必要がある。しかしながら、あまり多量に含有させる
と、靭性が低下するので上限を０．６％とした。C: 0.05 to 0.6% C is an element necessary for ensuring the strength required for steel for machine structural use, and for that purpose it is necessary to contain 0.05% or more. However, if the content is too large, the toughness decreases, so the upper limit was made 0.6%.
【０００９】Ｓｉ：０．０３〜１％ Ｓｉは脱酸剤として有効な元素であり、その効果を発揮
させるためには０．０３％以上含有させる必要がある。
しかしながら、過剰に含有させると、被削性および靭性
が低下するので上限を１％とした。Si: 0.03 to 1% Si is an effective element as a deoxidizer, and it is necessary to contain Si in an amount of 0.03% or more in order to exert its effect.
However, if it is contained excessively, the machinability and the toughness decrease, so the upper limit was made 1%.
【００１０】Ｍｎ：０．１〜２％ Ｍｎは鋼の焼入性を高める他、ＭｎＳを形成することに
よってＳによる熱間脆化を防止し、被削性を向上させる
のに有効な元素である。その効果を発揮させるためには
０．１％以上含有させる必要があるが、多量に含有させ
ると被削性を低下させるので２％以下とすべきである。Mn: 0.1 to 2% Mn is an element effective not only for improving the hardenability of steel but also for preventing hot embrittlement due to S by forming MnS and improving the machinability. is there. In order to exert the effect, it is necessary to contain 0.1% or more, but if it is contained in a large amount, the machinability is deteriorated, so it should be 2% or less.
【００１１】Ｓ：０．００５〜０．１２％ ＳはＭｎＳを形成して被削性を向上させるために、０．
００５％以上含有させる。しかしながら、過剰に含有さ
せると熱間脆化、機械的性質および疲労強度に対しての
異方性を大きくさせるので上限を０．１２％とした。S: 0.005 to 0.12% S forms MnS and improves machinability, so that S.
005% or more is contained. However, if contained excessively, the anisotropy with respect to hot embrittlement, mechanical properties and fatigue strength is increased, so the upper limit was made 0.12%.
【００１２】Ｉｎ：０．００１〜０．１％ Ｉｎは被削性（特に切り屑処理性）を向上させるため
に、少なくとも０．００１％含有させる必要がある。し
かしながら、過剰に含有させると熱間加工性および靭性
が低下するので上限を０．１％とした。In: 0.001-0.1% In is required to be contained at least 0.001% in order to improve machinability (particularly chip disposability). However, if it is contained excessively, the hot workability and toughness deteriorate, so the upper limit was made 0.1%.
【００１３】Ｎ：０．００３〜０．０２％ Ｎは結晶粒微細化のために、少なくとも０．００３％含
有させる。しかしながら、０．０２％を超えて含有させ
ると硬さが増加して被削性が低下するので、上限を０．
０２％とした。N: 0.003 to 0.02% N is contained in an amount of at least 0.003% for refining crystal grains. However, if the content exceeds 0.02%, the hardness increases and the machinability decreases, so the upper limit is set to 0.
It was set to 02%.
【００１４】Ｏ：０．００２％以下 Ｏは鋼の被削性、疲労強度に有害なＡｌ2 Ｏ3 等の酸化
物系介在物を生成させるので、０．００２％以下に抑制
する必要がある。O: 0.002% or less O produces oxide inclusions such as Al 2 O 3 which are harmful to the machinability and fatigue strength of steel, so it is necessary to suppress it to 0.002% or less. .
【００１５】Ａｌ2 Ｏ3 ：０．００２％以下 Ａｌ2 Ｏ3 は、鋼の被削性、疲労強度に特に悪影響を及
ぼす硬質介在物であるので、０．００２％以下に抑制す
る必要がある。Al 2 O 3 : 0.002% or less Since Al 2 O 3 is a hard inclusion that exerts a bad influence particularly on the machinability and fatigue strength of steel, it is necessary to suppress it to 0.002% or less. .
【００１６】本発明の機械構造用鋼は、上記の各元素を
基本成分とし、残部Ｆｅおよび不可避不純物からなるも
のであるが、必要によってＢ，Ｃｒ，Ｎｉ，Ｐｂ，Ｔ
ｅ，Ｚｒ，Ｃａ，希土類元素（ＲＥＭ），Ｖ等を所定量
含有させることができる。これらの元素を含有させると
きの成分添加理由および組成範囲限定理由は、次の通り
である。The steel for machine structural use of the present invention contains each of the above elements as a basic component and the balance Fe and unavoidable impurities. If necessary, B, Cr, Ni, Pb, T may be used.
A predetermined amount of e, Zr, Ca, rare earth element (REM), V, etc. can be contained. The reasons for adding the components and limiting the composition range when these elements are contained are as follows.
【００１７】Ｂ：０．０００５〜０．０３％ Ｂは焼入性および靭性を向上させると共に、前述した如
く、Ｉｎの偏析を抑制して熱間加工性と疲労強度を向上
させるのに有効な元素である。その効果を発揮させるた
めには、少なくとも０．０００５％含有させる必要があ
るが、過剰に含有させると硬さが増加し、被削性が低下
するので上限を０．０３％とした。B: 0.0005 to 0.03% B is effective in improving the hardenability and toughness and, as described above, suppressing the segregation of In and improving the hot workability and the fatigue strength. It is an element. In order to exert the effect, it is necessary to contain at least 0.0005%, but if it is contained excessively, hardness increases and machinability decreases, so the upper limit was made 0.03%.
【００１８】Ｃｒ：２％以下，Ｍｏ：１％以下およびＮ
ｉ：６％以下よりなる群から選択される１種以上 Ｃｒ，ＭｏおよびＮｉは、いずれも焼入性を高めるのに
有効な元素である。またこのうちＭｏとＮｉは、靭性を
高めるのに有効である。しかしながら、過剰に含有させ
ると被削性が低下するので、Ｃｒは２％，Ｍｏは１％，
Ｎｉは６％を夫々上限とすべきである。Cr: 2% or less, Mo: 1% or less and N
i: one or more selected from the group consisting of 6% or less Cr, Mo and Ni are all effective elements for enhancing hardenability. Further, of these, Mo and Ni are effective in increasing the toughness. However, if it is contained excessively, the machinability deteriorates, so Cr is 2%, Mo is 1%,
Ni should have an upper limit of 6%, respectively.
【００１９】Ｐｂおよび／またはＴｅ：合計で０．０１
〜０．６％ ＰｂおよびＴｅは、上記の被削性向上元素であるＭｎ，
Ｓ，Ｉｎとの複合添加によって、被削性を更に向上させ
るのに有効な元素である。こうした効果を発揮させるた
めには、合計で０．０１％以上含有させる必要がある
が、過剰に含有させると鋼の製造性が低下し、また靭性
も阻害するので、含有量は合計で０．６％以下とする必
要がある。Pb and / or Te: 0.01 in total
~ 0.6% Pb and Te are Mn, which is the above machinability improving element,
It is an element effective for further improving the machinability by the combined addition of S and In. In order to exert such an effect, it is necessary to contain 0.01% or more in total. However, if it is excessively contained, the manufacturability of steel is deteriorated and the toughness is impaired. It should be 6% or less.
【００２０】Ｚｒ，ＣａおよびＲＥＭよりなる群から選
択される１種以上の元素：合計で０．０１〜０．６％ Ｚｒ，ＣａおよびＲＥＭは、いずれも硫化物系介在物
（特にＭｎＳ）を形態制御して球状化し、硫化物系介在
物による機械的性質や疲労強度等の異方性を改善するの
に有効である。こうした効果を発揮させるためには、合
計で０．０１％以上含有させる必要がある。しかしなが
ら、過剰に含有させるとＰｂやＴｅを過剰含有させた場
合と同様に、鋼の製造性が低下し、また靭性も阻害する
ので、これらの各元素の１種以上の含有量は、合計で
０．６％以下とする必要がある。One or more elements selected from the group consisting of Zr, Ca and REM: 0.01 to 0.6% in total Zr, Ca and REM are all sulfide inclusions (particularly MnS). It is effective for controlling the morphology and spheroidizing to improve anisotropy such as mechanical properties and fatigue strength due to sulfide inclusions. In order to exert such effects, it is necessary to contain 0.01% or more in total. However, if it is contained excessively, the manufacturability of the steel is lowered and the toughness is impaired as in the case of excessively containing Pb or Te. Therefore, the content of one or more of each of these elements in total is It should be 0.6% or less.
【００２１】Ｖ：０．０１〜０．３％ Ｖは結晶粒を微細化し、熱間鍛造後空冷のままで強度を
確保するのに有効であり、その効果を発揮させる為には
少なくとも０．０１％含有させる必要がある。しかしな
がら、過剰に含有させると被削性が低下するので、上限
を０．３％とした。V: 0.01 to 0.3% V is effective for refining crystal grains and ensuring strength by hot cooling after air cooling, and at least 0. It is necessary to contain 01%. However, if it is contained excessively, the machinability deteriorates, so the upper limit was made 0.3%.
【００２２】以下本発明を実施例によって更に詳細に説
明するが、下記実施例は本発明を限定する性質のもので
はなく、前・後記の趣旨に徴して設計変更することはい
ずれも本発明の技術的範囲に含まれるものである。The present invention will be described in more detail with reference to the following examples, but the following examples are not intended to limit the present invention, and any design changes made to the gist of the preceding and the following will be applied to the present invention. It is included in the technical scope.
【００２３】[0023]
【実施例】表１（発明鋼）および表２（比較鋼）に示す
化学成分組成の鋼を溶製して試験片を作製し、切削試験
（被削性試験）を行なった。尚表１，２中におけるＡｌ
2Ｏ3 量は、ＪＩＳ−Ｇ １２５７中のアルミニウム定
量法（鉄分離法）によって分析したものである。また切
削試験は、試験片を焼ならし後に、下記に示す条件下で
乾式旋削を行ない、下記に示す切り屑処理性指数によっ
て切り屑処理性を評価した。切削試験結果（切り屑処理
性指数）を、表１および２に併記する。EXAMPLES Steels having the chemical composition shown in Table 1 (inventive steel) and Table 2 (comparative steel) were melted to prepare test pieces, and a cutting test (machinability test) was conducted. Al in Tables 1 and 2
The amount of 2 O 3 is analyzed by the aluminum quantitative method (iron separation method) in JIS-G 1257. In the cutting test, after normalizing the test piece, dry turning was performed under the following conditions, and the chip disposability was evaluated by the chip disposability index shown below. The cutting test results (chip disposability index) are also shown in Tables 1 and 2.
【００２４】＜切削試験条件＞ 切削工具：ＳＫＨ９ 切削速度：１０，２０，３０，４０（ｍ／ｍｉｎ） 送り ：0.075 ，0.125 ，0.175 ，0.25（ｍｍ／ｒｅ
ｖ） 切り込み：１．５ｍｍ ＜切り屑処理性指数＞切り屑形態を４タイプに分類し、
夫々に評価点を与え、１６条件（切削速度４条件と送り
４条件の全組合わせ）の総合点で示した。ここで１６条
件全てにおいて小さく分断されると総合点は６４０点と
なり、１６条件全てにおいて長い切り屑の場合は１６０
点となる。<Cutting test conditions> Cutting tool: SKH9 Cutting speed: 10, 20, 30, 40 (m / min) Feed: 0.075, 0.125, 0.175, 0.25 (mm / re)
v) Incision: 1.5 mm <Chip disposability index> Chip morphology is classified into 4 types,
An evaluation point was given to each of them, and shown as a total point of 16 conditions (all combinations of cutting speed 4 conditions and feed 4 conditions). If all 16 conditions are divided into small pieces, the total score becomes 640 points. In all 16 conditions, long chips are 160 points.
It becomes a point.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【表２】 [Table 2]
【００２７】次に、発明鋼Ｎo.１，２および比較鋼Ｎo.
１４について、１１００℃で高温引張試験を行なって絞
り値を求め、熱間加工性を評価すると共に、下記の高周
波焼入条件で処理後、小野式回転曲げ疲労試験（８ｍｍ
φ平滑試験片）を実施した。その結果を表３に示す。Next, invention steel Nos. 1 and 2 and comparative steel No.
No. 14 was subjected to a high temperature tensile test at 1100 ° C. to obtain a reduction value to evaluate hot workability, and after being treated under the following induction hardening conditions, an Ono-type rotary bending fatigue test (8 mm
φ smooth test piece) was carried out. The results are shown in Table 3.
【００２８】＜高周波焼入条件＞ 発振器出力：７５ＫＷ×２００ＫＨｚ 加熱コイル：２０．５ｍｍφ×１０Ｗ 移動速度 ：７．９ｍｍ／ｓｅｃ 冷却剤 ：水 焼戻し ：なし<Induction hardening conditions> Oscillator output: 75 KW x 200 KHz Heating coil: 20.5 mmφ x 10 W Moving speed: 7.9 mm / sec Coolant: Water tempering: None
【００２９】[0029]
【表３】 [Table 3]
【００３０】以上の結果から、次の様に考察できた。ま
ず比較鋼Ｎo.１３の様にＩｎを添加した場合は、比較鋼
Ｎo.１１に対し、Ｐｂを添加した比較鋼Ｎo.１２と同等
の切り屑処理性を示しているが、発明鋼Ｎo.１の様にＡ
ｌ2 Ｏ3 含有量を低減することによって、Ｉｎの添加効
果が発揮され、切り屑処理性指数が更に向上しているこ
とが分かる。また発明鋼Ｎo.１は、発明鋼Ｎo.２と比べ
て、Ｂを添加していないため、Ｉｎが粒界に偏析して熱
間加工性および疲労強度が低下していることが分かる
（表３）。From the above results, the following can be considered. First, when In is added as in Comparative Steel No. 13, it shows the same chip disposability as Comparative Steel No. 12 in which Pb is added to Comparative Steel No. 11, but it is invention steel No. 11. A like 1
It can be seen that by reducing the l 2 O 3 content, the effect of adding In is exhibited and the chip disposability index is further improved. Inventive steel No. 1 does not contain B as compared with inventive steel No. 2, so that In segregates at grain boundaries and hot workability and fatigue strength are reduced (Table 3).
【００３１】比較鋼Ｎo.１４および発明鋼Ｎo.２は、と
もにＢを添加したものであるが、Ｉｎが粒界に偏析せ
ず、熱間加工性は同等（表３）を示しているが、比較鋼
Ｎo.１４はＡｌ2 Ｏ3 含有量が多いので、Ｉｎの添加効
果が発揮されず、切り屑処理性が低下していることが分
かる。The comparative steel No. 14 and the invention steel No. 2 both have B added, but In does not segregate at the grain boundaries and has the same hot workability (Table 3). Since the comparative steel No. 14 has a large Al 2 O 3 content, it is understood that the effect of adding In is not exhibited and the chip disposability is deteriorated.
【００３２】比較鋼Ｎo.１５，１６，１７は、夫々ＳＣ
ｒ鋼，ＳＣＭ鋼，ＳＮＣＭ鋼にＩｎを添加した場合を示
すものであるが、いずれもＡｌ2 Ｏ3 含有量が多いの
で、Ｉｎの添加効果が発揮されず、切り屑処理性が低下
していることが分かる。これに対し、発明鋼Ｎo.３〜５
は、夫々比較鋼Ｎo.１５〜１７に比べて、更にＡｌ2 Ｏ
3 含有量を低減しているので、Ｉｎの添加効果が発揮さ
れ、切り屑処理性が向上していることが分かる。Comparative steel Nos. 15, 16, and 17 are SCs, respectively.
In case of adding In to r steel, SCM steel and SNCM steel
Al is2 O3 It has a high content
The effect of adding In is not exhibited, and the chip disposability decreases.
You can see that On the other hand, invention steel Nos. 3 to 5
Are more Al than the comparative steel Nos. 15 to 17, respectively.2 O
3 Since the content is reduced, the effect of adding In is demonstrated.
It can be seen that the chip disposability is improved.
【００３３】比較鋼Ｎo.１８〜２０は、Ｉｎ以外にＰ
ｂ，Ｔｅ，Ｚｒ，Ｃａ，ＲＥＭ等の１種または２種以上
を添加したものであるが、いずれもＡｌ2 Ｏ3 含有量が
多いので、Ｉｎの添加効果が発揮されず、切り屑処理性
が低下していることが分かる。これに対し、発明鋼Ｎo.
６〜８は、夫々比較鋼Ｎo.１８〜２０に比べて更にＡｌ
2 Ｏ3 含有量を低減しているので、Ｉｎの添加効果が発
揮されると共に、他の被削性向上元素の効果によって、
被削性向上元素としてＩｎのみの添加よりも（発明鋼Ｎ
o.１〜５）更に切り屑処理性が向上していることが分か
る。Comparative steel Nos. 18 to 20 have P in addition to In.
One or more of b, Te, Zr, Ca, REM, etc.
Was added, but both were Al2 O3 Content is
Since there are many, the effect of adding In is not exhibited, and chip disposability is improved.
It can be seen that is decreasing. On the other hand, invention steel No.
6 to 8 are more Al than the comparative steel Nos. 18 to 20, respectively.
2 O3 Since the content is reduced, the effect of adding In
With the effect of other machinability improving elements,
Rather than adding In alone as a machinability improving element (invention steel N
o.1-5) It can be seen that the chip disposability is further improved.
It
【００３４】比較鋼Ｎo.２０，２１は、夫々Ｖを添加し
たＳＣｒ系およびＳＣ系の非調質鋼であるが、いずれも
Ａｌ2 Ｏ3 含有量が多いので、切り屑処理性が低下して
いることが分かる。これに対し、発明鋼Ｎo.９，１０
は、夫々比較鋼Ｎo.２０，２１に比べ更にＡｌ2 Ｏ3 含
有量を低減しているので、Ｉｎの添加効果が発揮され、
切り屑処理性が向上していることが分かる。Comparative steel Nos. 20 and 21 are SCr-based and SC-based non-heat treated steels to which V is added, respectively, but both have a high Al 2 O 3 content, so that the chip disposability is deteriorated. I understand that. On the other hand, invention steel Nos. 9 and 10
Have a lower Al 2 O 3 content than the comparative steel Nos. 20 and 21, respectively, so that the effect of adding In is exhibited.
It can be seen that the chip disposability is improved.
【００３５】[0035]
【発明の効果】本発明は以上の様に構成されており、鋼
中のＯおよびＡｌ2 Ｏ3 含有量をできるだけ低減するこ
とによって、Ｉｎ添加効果を十分発揮させて被削性に優
れた機械構造用鋼が得られた。またＩｎの粒界への偏析
は、Ｂを添加することによってそれを防止し、熱間加工
性や疲労強度等を低下させることもない。この様にして
得られた本発明の機械構造用鋼は、優れた被削性、熱間
加工性および疲労強度を必要とする機械構造用材料とし
て最適である。EFFECT OF THE INVENTION The present invention is configured as described above, and by reducing the contents of O and Al 2 O 3 in steel as much as possible, a machine having excellent machinability by sufficiently exhibiting the effect of adding In. Structural steel was obtained. In addition, segregation of In into grain boundaries is prevented by adding B, and hot workability and fatigue strength are not reduced. The thus-obtained mechanical structural steel of the present invention is optimal as a mechanical structural material that requires excellent machinability, hot workability and fatigue strength.
Claims (6)
味、以下同じ），Ｓｉ：０．０３〜１％，Ｍｎ：０．１
〜２％，Ｓ：０．００５〜０．１２％，Ｉｎ：０．００
１〜０．１％，Ｎ：０．００３〜０．０２％を夫々含有
すると共に、Ｏ：０．００２％以下およびＡｌ2 Ｏ3 ：
０．００２％以下に夫々抑制してなり、残部Ｆｅおよび
不可避不純物よりなることを特徴とする被削性に優れた
機械構造用鋼。1. C: 0.05 to 0.6% (meaning weight%; the same applies hereinafter), Si: 0.03 to 1%, Mn: 0.1
~ 2%, S: 0.005 to 0.12%, In: 0.00
1 to 0.1%, N: 0.003 to 0.02%, and O: 0.002% or less and Al 2 O 3 :
A steel for machine structural use, which is excellent in machinability, characterized in that it is suppressed to 0.002% or less, respectively, and the balance is Fe and inevitable impurities.
含有したものである請求項１に記載の機械構造用鋼。2. The steel for machine structural use according to claim 1, further containing B: 0.0005 to 0.03%.
およびＮｉ：６％以下よりなる群から選択される１種以
上を含有するものである請求項１または２に記載の機械
構造用鋼。3. The mechanical structure according to claim 1, further comprising at least one selected from the group consisting of Cr: 2% or less, Mo: 1% or less and Ni: 6% or less. For steel.
０．０１〜０．６％含有する請求項１〜３のいずれかに
記載の機械構造用鋼。4. The steel for machine structural use according to claim 1, further comprising Pb and / or Te: 0.01 to 0.6% in total.
なる群から選択される１種以上を合計で、０．０１〜
０．６％含有する請求項１〜４のいずれかに記載の機械
構造用鋼。5. Further, one or more kinds selected from the group consisting of Zr, Ca and rare earth elements in a total amount of 0.01 to
The steel for machine structure according to any one of claims 1 to 4, which contains 0.6%.
ると共に、熱間鍛造後空冷のままで得られるものである
請求項１〜５のいずれかに記載の機械構造用鋼。6. The steel for machine structural use according to claim 1, which further contains V: 0.01 to 0.3% and is obtained by hot forging and air cooling. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19753593A JPH0754099A (en) | 1993-08-09 | 1993-08-09 | Steel for machine structure use excellent in machinability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19753593A JPH0754099A (en) | 1993-08-09 | 1993-08-09 | Steel for machine structure use excellent in machinability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0754099A true JPH0754099A (en) | 1995-02-28 |
Family
ID=16376089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19753593A Withdrawn JPH0754099A (en) | 1993-08-09 | 1993-08-09 | Steel for machine structure use excellent in machinability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0754099A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0347438A (en) * | 1989-07-12 | 1991-02-28 | Mitsubishi Motors Corp | Fuel control device for engine |
| JP2021134420A (en) * | 2020-02-28 | 2021-09-13 | 日本製鉄株式会社 | Steel for machine structure |
| JP2021134418A (en) * | 2020-02-28 | 2021-09-13 | 日本製鉄株式会社 | Steel for machine structure and cutting method therefor |
| JP2021147696A (en) * | 2020-03-23 | 2021-09-27 | 日本製鉄株式会社 | Steel for machine structural use, machine structural parts and manufacturing method thereof |
| JP2022505860A (en) * | 2018-10-26 | 2022-01-14 | ポスコ | Steel sheet for pressure vessels with excellent cryogenic toughness and ductility and its manufacturing method |
-
1993
- 1993-08-09 JP JP19753593A patent/JPH0754099A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0347438A (en) * | 1989-07-12 | 1991-02-28 | Mitsubishi Motors Corp | Fuel control device for engine |
| JP2022505860A (en) * | 2018-10-26 | 2022-01-14 | ポスコ | Steel sheet for pressure vessels with excellent cryogenic toughness and ductility and its manufacturing method |
| JP2021134420A (en) * | 2020-02-28 | 2021-09-13 | 日本製鉄株式会社 | Steel for machine structure |
| JP2021134418A (en) * | 2020-02-28 | 2021-09-13 | 日本製鉄株式会社 | Steel for machine structure and cutting method therefor |
| JP2021147696A (en) * | 2020-03-23 | 2021-09-27 | 日本製鉄株式会社 | Steel for machine structural use, machine structural parts and manufacturing method thereof |
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