JPH0737658B2 - Free cutting steel - Google Patents
Free cutting steelInfo
- Publication number
- JPH0737658B2 JPH0737658B2 JP61036229A JP3622986A JPH0737658B2 JP H0737658 B2 JPH0737658 B2 JP H0737658B2 JP 61036229 A JP61036229 A JP 61036229A JP 3622986 A JP3622986 A JP 3622986A JP H0737658 B2 JPH0737658 B2 JP H0737658B2
- Authority
- JP
- Japan
- Prior art keywords
- machinability
- cutting steel
- free
- steel
- added
- 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.)
- Expired - Lifetime
Links
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- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は快削鋼に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to free-cutting steel.
（従来の技術及び問題点） 従来、主として炭素鋼にPb、Bi、Se、Teなどの元素を添
加して被削性を改善することが知られている。このよう
な快削鋼は、添加する快削元素が高融点であることか
ら、高速加工でこれらを融体化して被削性が発揮される
ものであり、ドリル加工の如く低速加工域（例、20〜70
m/min）では上記快削元素がその機能を十分に発揮しえ
ないという問題がある。(Prior Art and Problems) Conventionally, it has been known to improve machinability mainly by adding elements such as Pb, Bi, Se and Te to carbon steel. Since such free-cutting steel has a high melting point as the free-cutting element to be added, it can be melted in high-speed machining to exhibit machinability, and can be used in low-speed machining areas such as drilling. , 20 ~ 70
m / min), there is a problem that the above free-cutting elements cannot fully exhibit their functions.
そのため、低速加工域での被削性改善の研究がなされ、
例えば、ＢとＯの化合物が約600℃の低い融点を有する
ことに着目して、炭素鋼にＢとＯを含有せしめる試みが
ある。しかし、かかる快削鋼は被削性が若干改善される
程度の効果しか得られず、実用上更に優れた被削性を有
する炭素鋼の出現が望まれていた。Therefore, research on machinability improvement in low-speed machining area has been made,
For example, attention has been paid to the fact that the compound of B and O has a low melting point of about 600 ° C., and there is an attempt to incorporate B and O in carbon steel. However, such free-cutting steel can only obtain the effect of slightly improving the machinability, and the advent of carbon steel having further excellent machinability in practical use has been desired.
（発明の目的） 本発明は、上記要請に応えるべくなされたものであっ
て、特に低速加工域での被削性（工具寿命、切削破砕
性）を顕著に改善し得る快削鋼を提供することを目的と
するものである。(Object of the invention) The present invention has been made in order to meet the above-mentioned requirements, and provides a free-cutting steel capable of remarkably improving machinability (tool life, cutting crushability) particularly in a low-speed working region. That is the purpose.
（発明の構成） 上記目的を達成するため、本発明者らは、前述のＢとＯ
の化合物利用による被削性改善技術を更に発展させるべ
く鋭意研究を重ねた結果、ＢとPbを複合添加し、ＢとＯ
の低融点化合物(B2O3)に対してPbが結合した鉛−酸化物
の複合介在物を生成させることにより、その融体脆化作
用を強化し、特に低速加工域での被削性を顕著に改善で
きることを見い出した。本発明は、この知見に基づいて
完成したものである。(Structure of the Invention) In order to achieve the above object, the inventors of the present invention have described the above B and O.
As a result of earnest research to further develop the machinability improvement technology using the compound of B, P and B were added in combination, and B and O were added.
By forming a lead-oxide composite inclusion in which Pb is bound to the low melting point compound (B 2 O 3 ) of, the melt embrittlement action is strengthened, and machinability especially in the low-speed machining range It has been found that can be significantly improved. The present invention has been completed based on this finding.
すなわち、本発明に係る快削鋼は、Ｃ≦0.60％、Si≦0.
50％、Mn≦2.0％、Pb:0.1〜0.40％、B:0.0030〜0.0200
％、Ｎ≦0.020％及びO:0.0020〜0.0300％を含み、か
つ、B/O＝0.1〜1.0であり、残余が実質的にFeからなる
ことを特徴とするものである。That is, the free-cutting steel according to the present invention has C ≦ 0.60% and Si ≦ 0.
50%, Mn ≦ 2.0%, Pb: 0.1 to 0.40%, B: 0.0030 to 0.0200
%, N ≦ 0.020% and O: 0.0020 to 0.0300%, B / O = 0.1 to 1.0, and the balance being substantially Fe.
以下に本発明を実施例に基づいて詳細に説明する。The present invention will be described in detail below based on examples.
前述の如く、本発明鋼は、Ｂの酸化物とPbとの複合介在
物の生成により被削性を向上させることを基本とする
が、他の元素をも規制することにより、はじめて実用上
供し得る快削鋼とするもので、成分限定理由は次のとう
りである。As described above, the steel of the present invention is basically improved in machinability by the formation of complex inclusions of B oxide and Pb, but it is not put into practical use for the first time by controlling other elements. This is the free-cutting steel to be obtained, and the reasons for limiting the components are as follows.
C: Ｃは強度を上げるために添加する必要があり、0.008％
以上が望ましい。しかし、0.60％を超えて多量であると
被削性を低下させるので、上限を0.60％とするが、0.20
％以下が望ましい。C: C must be added to increase strength, 0.008%
The above is desirable. However, if it exceeds 0.60% in a large amount, the machinability deteriorates, so the upper limit is made 0.60%, but 0.20
% Or less is desirable.
Si: Siは脱酸元素として添加するが、本発明においては酸素
量をある程度必要とするので、0.5％以下とし、0.02％
以下が望ましい。Si: Si is added as a deoxidizing element, but in the present invention, the amount of oxygen is required to some extent, so 0.5% or less, 0.02%
The following is desirable.
Mn: Mnは脱酸・脱硫元素として添加するが、Siの場合と同
様、多量に添加できないので、2.0％以下とする。Mn: Mn is added as a deoxidizing / desulfurizing element, but as in the case of Si, it cannot be added in a large amount, so the content is made 2.0% or less.
Pb: PbはＢの酸化物と結合して複合介在物を形成して被削性
の改善を図るために0.01％以上を添加する必要がある
が、0.40％を超えると固溶せず熱間加工性を低下させる
ので、0.01〜0.40％の範囲で添加する。Pb: Pb must be added in an amount of 0.01% or more to combine with the oxide of B to form a composite inclusion and improve machinability, but if it exceeds 0.40%, it does not form a solid solution and becomes hot. Since it decreases the workability, it is added in the range of 0.01 to 0.40%.
B: ＢはＯと化合物をつくり被削性を改善するために0.0030
％以上必要であるが、0.0200％超えると熱間加工性を低
下させるので、0.0030〜0.0200％の範囲とする。B: B is 0.0030 to form a compound with O to improve machinability.
% Is necessary, but if it exceeds 0.0200%, the hot workability is deteriorated, so the range is 0.0030 to 0.0200%.
O: ＯはＢと化合物をつくり被削性を改善する。そのために
は0.0020％以上が必要である。しかし、0.0300％を超え
ると巨大な酸化物が生成し、逆に被削性を低下させ熱間
加工性を害することになるので、0.0020〜0.0300％の範
囲とする。O: O forms a compound with B and improves machinability. For that purpose, 0.0020% or more is required. However, if it exceeds 0.0300%, a huge oxide is generated, which conversely lowers the machinability and impairs the hot workability, so the content is made 0.0020 to 0.0300%.
但し、上記ＢとＯの量は、Ｂの酸化物を生成し、被削性
の改善を図るので、両者の比（B/O）を規制する必要が
あり、B/O＝0.1〜1.0の範囲内とする。However, since the amount of B and O forms the oxide of B and improves the machinability, it is necessary to regulate the ratio (B / O) of both, and B / O = 0.1 to 1.0 Within the range.
N: Ｎが0.020％を超えるとＢとＮが化合物を生成して熱間
加工性の低下を招くので、上限を0.020％に規制する必
要がある。N: If N exceeds 0.020%, B and N form a compound, leading to deterioration in hot workability, so it is necessary to control the upper limit to 0.020%.
（実施例） 第１表に示す化学成分（wt％）を有する鋼を2tonアーク
溶解炉で溶製し、熱間圧延によって60mmφの丸棒に加工
した後、ドリル試験に供し、被削性を調べた。(Example) Steel having the chemical composition (wt%) shown in Table 1 was smelted in a 2 ton arc melting furnace and processed into a 60 mmφ round bar by hot rolling, which was then subjected to a drill test to determine its machinability. Examined.
なお、被削性は供試材No.4（比較鋼）についてのドリル
加工能率を100とし、これに対する割合で評価した。そ
れらの結果を同表に併記した。The machinability was evaluated by the ratio to the drilling efficiency of the sample material No. 4 (comparative steel) as 100. The results are also shown in the table.
同表より明らかなとうり、ＢとPbを複合し、B/Oの比を
適正に調整した本発明鋼No.1〜３は、大幅に被削性が改
善されている。 As is clear from the table, Steels Nos. 1 to 3 of the present invention, in which B and Pb are compounded and the B / O ratio is properly adjusted, have significantly improved machinability.
（発明の効果） 以上詳述したように、本発明によれば、ＢとPbの複合添
加を基本とした快削鋼であるので、特に低速加工域での
被削工を顕著に改善することができる。(Effects of the Invention) As described in detail above, according to the present invention, since it is a free-cutting steel based on the combined addition of B and Pb, it is possible to remarkably improve the machining work particularly in the low-speed machining area. You can
Claims (1)
2.0％、Pb:0.1〜0.40％、B:0.0030〜0.0200％、Ｎ≦0.0
20％及びO:0.0020〜0.0300％を含み、かつ、B/O＝0.1〜
1.0であり、残余が実質的にFeからなることを特徴とす
る快削鋼。1. In weight%, C ≦ 0.60%, Si ≦ 0.50%, Mn ≦
2.0%, Pb: 0.1 to 0.40%, B: 0.0030 to 0.0200%, N ≤ 0.0
20% and O: 0.0020 to 0.0300% included, and B / O = 0.1 to
A free-cutting steel having a value of 1.0 and the balance being substantially Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61036229A JPH0737658B2 (en) | 1986-02-20 | 1986-02-20 | Free cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61036229A JPH0737658B2 (en) | 1986-02-20 | 1986-02-20 | Free cutting steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62196361A JPS62196361A (en) | 1987-08-29 |
| JPH0737658B2 true JPH0737658B2 (en) | 1995-04-26 |
Family
ID=12463942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61036229A Expired - Lifetime JPH0737658B2 (en) | 1986-02-20 | 1986-02-20 | Free cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0737658B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0756060B2 (en) * | 1988-05-25 | 1995-06-14 | 株式会社神戸製鋼所 | Super free cutting steel with excellent machinability |
| JP6489215B2 (en) * | 2015-06-10 | 2019-03-27 | 新日鐵住金株式会社 | Free-cutting steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62139847A (en) * | 1985-12-12 | 1987-06-23 | Azuma Seikosho:Kk | Continuously cast sulfur free-cutting steel having satisfactory drawability |
-
1986
- 1986-02-20 JP JP61036229A patent/JPH0737658B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62196361A (en) | 1987-08-29 |
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