JPH05279792A - Electric resistance welded steel tube for machine structure excellent in machinability - Google Patents
Electric resistance welded steel tube for machine structure excellent in machinabilityInfo
- Publication number
- JPH05279792A JPH05279792A JP4077979A JP7797992A JPH05279792A JP H05279792 A JPH05279792 A JP H05279792A JP 4077979 A JP4077979 A JP 4077979A JP 7797992 A JP7797992 A JP 7797992A JP H05279792 A JPH05279792 A JP H05279792A
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- Prior art keywords
- electric resistance
- machinability
- steel
- resistance welded
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、被削性の優れた機械構
造用電気抵抗溶接鋼管に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric resistance welded steel pipe for machine structure having excellent machinability.
【０００２】[0002]
【従来の技術】切削加工技術の進展、自動車その他の機
械生産量の増大に伴い、被削性の優れた鋼材の必要性が
大きくなっている。機械構造用鋼管についても、切削加
工の自動化、高能率化によって切屑処理性、切削仕上面
の良好な材料が望まれている。一般の機械構造用鋼につ
いては、被削性を改善させるために、例えば特開昭５５
−８５６５８号公報、特開昭５７−１４０８５３号公報
や特開昭６２−３３７４７号公報に示されているような
Ｓ系快削鋼、Ｐｂ快削鋼、Ｃａ快削鋼およびこれらの複
合快削鋼が開発され、実用化されている。2. Description of the Related Art With the progress of cutting technology and the increase in production of automobiles and other machines, the need for steel materials having excellent machinability is increasing. Also for steel pipes for machine structures, materials having good chip disposability and a good cutting finish are desired due to automation of cutting and high efficiency. In order to improve machinability, general steel for machine structural use is disclosed in, for example, JP-A-55.
-85658, JP-A-57-140853 and JP-A-62-33747, S-based free cutting steel, Pb free cutting steel, Ca free cutting steel, and composite free cutting of these. Steel has been developed and put into practical use.
【０００３】なお、これらの快削性元素が生成する介在
物による機械的性質の劣化を防ぐために、特公昭６１−
１６３３７号公報に示すようにsol.Ａｌを制限し、Ｓ、
Ｃａ、Ｏの量を特定しているものもある。In order to prevent deterioration of mechanical properties due to inclusions formed by these free-cutting elements, Japanese Patent Publication No.
As disclosed in Japanese Patent No. 16337, sol.Al is restricted to S,
Some have specified the amounts of Ca and O.
【０００４】[0004]
【発明が解決しようとする課題】上記に示した、従来の
快削鋼を用いて、被削性の良好な機械構造用鋼管を電気
抵抗溶接によって製造しようとする際には、以下に示す
問題点がある。すなわち、これらの快削鋼の快削性元素
が生成する介在物は、一般に機械的性質を劣化させ、さ
らに電気抵抗溶接性を劣化させ、溶接割れ、超音波探傷
試験時のＵＳＴ不良、などによる大幅な歩留低下の原因
となるため、電気抵抗溶接管の材料としては使用するこ
とができない。When the conventional free-cutting steel described above is used to manufacture a steel pipe for machine structural use having good machinability by electric resistance welding, the following problems occur. There is a point. That is, the inclusions generated by the free-cutting elements of these free-cutting steels generally deteriorate mechanical properties, further deteriorate electric resistance weldability, cause welding cracks, and cause UST failure during ultrasonic flaw detection tests. It cannot be used as a material for electric resistance welded pipes because it causes a large decrease in yield.
【０００５】なお、特公昭６１−１６３３７号公報につ
いても、電気抵抗溶接管の素材として用いる場合には、
上記問題点を完全に解消するものでなく、さらにＳｉキ
ルド鋼においてＯの量を０．００４０重量％以下に低減
させることは、通常困難である。一方、上記した快削性
元素を、大幅な歩留低下を生じさせない範囲内で添加
し、電気抵抗溶接管素材とすることも考えられるが、こ
の程度の添加では、管に冷間引抜きあるいはその他の冷
間加工を与えた場合、一般に切屑処理性が悪化するた
め、その被削性は十分なものではない。Incidentally, Japanese Patent Publication No. 61-16337 also discloses that when used as a material for an electric resistance welded pipe,
It is not possible to completely eliminate the above problems, and it is usually difficult to reduce the amount of O to 0.0040% by weight or less in Si-killed steel. On the other hand, it is possible to add the above-mentioned free-cutting elements within a range that does not cause a significant reduction in yield to make an electric resistance welded pipe material, but with this level of addition, cold drawing or other When the cold working is applied, the chip disposability is generally deteriorated, and thus the machinability is not sufficient.
【０００６】本発明は、上記の問題点を解消し、機械構
造用電縫鋼管の被削性改善要求に応えることを目的とし
てなされたものである。The present invention has been made for the purpose of solving the above problems and meeting the demand for improving the machinability of electric resistance welded steel pipes for machine structures.
【０００７】[0007]
【課題を解決する手段】本発明の要旨とするところは下
記のとおりである。 （１） 重量％表示で Ｃ：０．０２〜０．６０％、 Ｓｉ：０．４％以下、 Ｍｎ：０．２０〜２．０％、 Ｐ：０．０３０％以下、 Ｓ：０．０４０％以下、 Ｔ．Ａｌ：０．００１〜０．０３０％、 Ｎ：０．００２０〜０．０１００％、 Ｏ：０．００６０％以下 を含み、さらに Ｓｎ：０．００２〜０．０４０％、Ｓｂ：０．００２〜
０．０４０％の１種以上を合計０．０５０％以下含有
し、残部鉄および不可避的不純物からなることを特徴と
する被削性の優れた機械構造用電気抵抗溶接鋼管。The subject matter of the present invention is as follows. (1) C: 0.02 to 0.60% by weight%, Si: 0.4% or less, Mn: 0.20 to 2.0%, P: 0.030% or less, S: 0.040 % Or less, T.I. Al: 0.001-0.030%, N: 0.0020-0.0100%, O: 0.0060% or less are included, and Sn: 0.002-0.040%, Sb: 0.002-
An electric resistance welded steel pipe for machine structure having excellent machinability, which contains 0.040% or more of 0.040% or more in total of 0.050% or less and is composed of the balance iron and unavoidable impurities.
【０００８】（２） さらに、 Ｂｉ：０．００２〜０．０４０％、Ｐｂ：０．００２〜
０．０４０％、Ｔｅ：０．００２〜０．０４０％の１種
以上を合計０．０５０％以下添加したことを特徴とする
前項１記載の被削性の優れた機械構造用電気抵抗溶接鋼
管。 （３） さらに、 Ｃｒ：０．１０〜１．５０％、 Ｍｏ：０．１０〜０．６０％ を添加したことを特徴とする前項１または２記載の被削
性の優れた機械構造用電気抵抗溶接鋼管。(2) Further, Bi: 0.002-0.040%, Pb: 0.002-
0.040%, Te: 0.002-0.040%, one or more kinds of which are added in a total of 0.050% or less, and the electric resistance welded steel pipe for machine structure having excellent machinability according to item 1 above. .. (3) Further, Cr: 0.10 to 1.50%, Mo: 0.10 to 0.60% are added, and the machine structure electricity having excellent machinability according to the above 1 or 2 is added. Resistance welded steel pipe.
【０００９】ここで、本発明は、切屑処理性の良好な電
気抵抗溶接鋼管を、歩留良く製造することを可能とする
ために、素材のＳ、Ｏの量を限定し、さらに管の機械的
性質を劣化させることのない範囲内で、快削性元素であ
るＮ、Ｓと、Ｓｎ、Ｓｂの１種以上、Ｂｉ、Ｐｂ、Ｔｅ
の１種以上との複合効果を最大限に発揮させたものであ
る。Here, the present invention limits the amounts of S and O in the raw material in order to enable the production of an electric resistance welded steel pipe having good chip disposability with a good yield, and further, the pipe machine The free-cutting elements N and S, and one or more of Sn and Sb, Bi, Pb, and Te within a range that does not deteriorate the physical properties.
It maximizes the combined effect of one or more of the above.
【００１０】[0010]
【作用】以下に、本発明の詳細を述べるとともに、前記
のように本発明鋼管の成分範囲を定めた理由について説
明する。本発明は、切屑処理性の良好な機械構造用鋼管
を、電気抵抗溶接により製造することを目的としたもの
で、Ｓ、Ｏの量を限定することにより、快削成分の介在
物による電気抵抗溶接の際の溶接割れ、ＵＳＴ不良など
を原因とする歩留の大幅低下を抑制し、Ｓ、Ｎ、および
Ｓｎ、Ｓｂの１種以上との複合効果により、被削性を向
上させている。In the following, the present invention will be described in detail, and the reason why the composition range of the steel pipe of the present invention is defined as described above will be explained. The present invention is intended to manufacture a steel pipe for machine structure having good chip disposability by electric resistance welding, and by limiting the amounts of S and O, the electric resistance due to inclusions of free-cutting components. A significant decrease in yield due to welding cracks during welding, UST failure, etc. is suppressed, and machinability is improved by the combined effect of S, N, and at least one of Sn and Sb.
【００１１】Ｃは、機械的強度を確保するために必須で
あるため、下限を０．０２％とした。また、０．６０％
を超えると靱性および被削性が劣化する上、製管のため
の電気抵抗溶接時に、その熱影響によって著しく硬化
し、加工性を損なうので、その上限を０．６０％とし
た。Ｓｉは、脱酸上鋼に含まれる元素であるが、過剰に
添加すると延性を低下させるほか、Ｓｉスケールの生成
によって被削材の表面性状を劣化させ、被削性も悪化さ
せるため、その上限値を０．４％とした。C is essential for ensuring the mechanical strength, so the lower limit was made 0.02%. Also, 0.60%
If it exceeds 1.0, the toughness and machinability will deteriorate, and at the time of electric resistance welding for pipe production, it will be markedly hardened by the heat effect thereof and impair the workability, so the upper limit was made 0.60%. Si is an element contained in deoxidized upper steel, but if it is added excessively, ductility is reduced, and the surface quality of the work material is deteriorated by the generation of Si scale, which also deteriorates the machinability. The value was 0.4%.
【００１２】Ｍｎは、一般に鋼の強度、靱性を確保する
上で不可欠な元素であり、Ｓによる熱間脆性を回避する
意味を併せて、下限を０．２０％とした。しかしなが
ら、過度の添加は、加工性、溶接性を劣化させるため、
２．０％以下とした。Ｐは、一般に鋼中に固溶して生地
を脆化させることにより被削性を向上させる元素である
が、この量が多いと電気抵抗溶接性を劣化させる。従っ
て、その上限を０．０３０％とした。[0012] Generally, Mn is an element essential for ensuring the strength and toughness of steel, and the lower limit is set to 0.20% in consideration of avoiding hot embrittlement due to S. However, since excessive addition deteriorates workability and weldability,
It was set to 2.0% or less. P is an element that generally improves the machinability by forming a solid solution in steel to embrittle the material, but a large amount of P deteriorates the electric resistance weldability. Therefore, the upper limit is set to 0.030%.
【００１３】Ｓは、切屑処理性を改善するために有効な
元素であるが、Ｓ量の増大とともに、製管のための電気
抵抗溶接の際の溶接割れ、超音波探傷試験時のＵＳＴ不
良などによる大幅な歩留低下の原因となるため、その上
限値を０．０４０％とした。Ｎは、被削性に対して有効
な元素である。これは、切屑の温度がＮによる青熱脆性
温度領域に達するため、切屑の分断性が良くなるという
ものであり、０．００２０％以上の添加でその作用を発
揮する。しかしながら、０．０１００％を超えて添加す
ると溶接性を著しく劣化させることから、その上限値を
０．０１００％とした。S is an element effective for improving the chip disposability, but as the amount of S increases, welding cracks during electric resistance welding for pipe manufacturing, UST failure during ultrasonic flaw detection tests, etc. Therefore, the upper limit is set to 0.040%. N is an element effective for machinability. This is because the temperature of the chips reaches the blue-heat embrittlement temperature range due to N, so that the chip-dividing property of the chips is improved, and the effect is exhibited when 0.0020% or more is added. However, if added in excess of 0.0100%, the weldability is significantly deteriorated, so the upper limit was made 0.0100%.
【００１４】Ａｌは、一般に脱酸上含まれる元素であ
り、リムド鋼ベースのものを考慮して、Ｔ．Ａｌの下限
値を０．００１％とした。一方、Ａｌはアルミナクラス
ターの生成により鋼の被削性を悪化させるため、その上
限を０．０３０％とした。なお、ＡｌＮの生成により、
Ｎによる効果である青熱脆性が軽減するので、青熱脆性
の効果を最大限に発揮させるためには、Ｔ．Ａｌを０．
００６％以下とし、Ｎを０．００４０％以上添加するの
が望ましい。Al is an element generally contained in deoxidation, and taking into consideration that it is based on rimmed steel, Al. The lower limit of Al was 0.001%. On the other hand, Al deteriorates the machinability of steel due to the formation of alumina clusters, so the upper limit was made 0.030%. By the generation of AlN,
Since blue heat brittleness, which is an effect of N, is reduced, in order to maximize the effect of blue heat brittleness, T. Al to 0.
It is desirable to add 006% or less and add N by 0.0040% or more.
【００１５】Ｏは、前述のＳ量、Ｔ．Ａｌ量を前提とし
た場合、０．００６０％超の添加によって酸化物が増大
し、超音波探傷試験時のＵＳＴ不良の要因となる上、後
述のＣａ酸化物を生成することにより、次に述べる硫化
物ＭｎＳの形態を制御するためのＣａを少なくするた
め、その上限を０．００６０％とした。Ｓｎ、Ｓｂは、
低融点で、切屑の温度領域の脆化により、切屑の破砕性
を良好とし、それぞれ０．００２％以上の添加でその効
果を発揮する。しかしながら、これらの多量添加は、熱
間加工性、冷間加工性の他、電気抵抗溶接性を阻害する
ため、上記のＳ、Ｎとの複合効果を前提として、Ｓｂ、
Ｓｎをそれぞれ０．０４０％以下を１種以上、合計０．
０５０％以下とした。本発明においては、Ｓ、Ｎおよ
び、Ｓｂ、Ｓｎの１種以上との複合効果により、被削性
向上に対して十分にその効果を発揮し、製管後に、冷間
加工により加工硬化を与えられた材料についても、優れ
た切屑処理性を優している。O is the aforementioned S content, T. Assuming the amount of Al, the addition of more than 0.0060% increases the amount of oxides, which causes UST failure during ultrasonic flaw detection tests, and also produces Ca oxides, which will be described later. In order to reduce Ca for controlling the morphology of sulfide MnS, its upper limit was made 0.0060%. Sn and Sb are
With a low melting point, embrittlement in the temperature range of the chips improves the crushability of the chips, and the effect is exhibited by adding 0.002% or more of each. However, addition of a large amount of these impedes electric resistance weldability in addition to hot workability and cold workability, so that Sb, Sb,
One or more of Sn is 0.040% or less, and a total of 0.
It was set to 050% or less. In the present invention, the combined effect of one or more of S, N and Sb, Sn exerts its effect sufficiently on the improvement of machinability, and after pipe making, work hardening is given by cold working. The obtained material also excels in excellent chip disposability.
【００１６】さらに、切屑処理性、切屑工具寿命をさら
に向上させることを目的として、さらに、Ｂｉ、Ｐｂ、
Ｔｅなどを添加することも可能である。ここで、Ｂｉ、
Ｐｂはいずれも低融点で、０．００２％以上の添加によ
り、切屑の温度領域での脆化により切屑の分断性を良く
する。また、Ｔｅは、０．００２％以上の添加により、
Ｓと有効に結びついてＭｎＳの展伸を防止することで被
削性を向上させる。しかしながら、これらを多量に添加
すると、熱延時の表面疵の原因となるほか、冷間加工性
を阻害するため、Ｂｉ、Ｐｂ、Ｔｅそれぞれ０．０４０
％以下を１種以上、合計０．０５０％以下とした。な
お、管の被削性と、製管後のＵＳＴ歩留、冷間加工性な
どを最良のものとするには、Ｓｂ、Ｓｎ、Ｂｉ、Ｐｂ、
Ｔｅの合計を０．０５０％以下に抑えることが望ましい
なお、製管後のＵＳＴ歩留不良を最大限に抑制するとと
もに、切削工具寿命、冷間加工後の機械的性質を優れた
ものにするには、Ｃａの０．０２０％以下の添加が有効
である。Furthermore, for the purpose of further improving the chip disposability and the chip tool life, Bi, Pb,
It is also possible to add Te or the like. Where Bi,
Pb has a low melting point, and when added in an amount of 0.002% or more, embrittlement in the temperature range of the chips improves the chip-dividing property of the chips. Moreover, Te is added by 0.002% or more,
Machinability is improved by effectively binding to S and preventing the spread of MnS. However, addition of a large amount of these causes surface defects during hot rolling and impairs cold workability, so Bi, Pb, and Te are each added at 0.040%.
% Or less was set to one or more, and a total of 0.050% or less. In order to maximize the machinability of the pipe, the UST yield after pipe making, and the cold workability, Sb, Sn, Bi, Pb,
It is desirable to keep the total Te within 0.050% or less. In addition to maximizing UST yield failure after pipe making, it also improves cutting tool life and mechanical properties after cold working. For this, addition of 0.020% or less of Ca is effective.
【００１７】また、本発明は機械構造用鋼管の耐食性を
考慮して、０．１０％以上のＣｒ、Ｍｏ等の合金元素を
加えた場合にも有効であり、炭素鋼をはじめ各種の合金
鋼に対しても適用し得る。但し、これらの元素について
も、多量添加は機械構造用合金鋼としての被削性を低下
させるので、その上限値をそれぞれ１．５０％、０．６
０％とした。さらに、必要に応じて結晶粒を細粒化し靱
性を向上させるためにＮｂ、Ｗ等を含有させることも可
能である。また、本発明にＲＥＭ（希土類元素）を含有
させることにより機械的性質を改善させることも可能で
ある。The present invention is also effective when alloy elements such as Cr and Mo are added in an amount of 0.10% or more in consideration of the corrosion resistance of steel pipes for machine structures. Can also be applied to. However, also for these elements, addition of a large amount reduces the machinability of the alloy steel for machine structural use, so the upper limits thereof are 1.50% and 0.6, respectively.
It was set to 0%. Further, if necessary, Nb, W, etc. may be contained in order to make the crystal grains finer and improve the toughness. It is also possible to improve mechanical properties by incorporating REM (rare earth element) in the present invention.
【００１８】本発明に従い、前記の化学成分で構成され
た鋼は、転炉、電気炉などで溶製され、造塊−分塊、あ
るいは連続鋳造の工程を経て、熱間圧延される。この後
に、必要に応じて冷間圧延を施され、管成形−電気抵抗
溶接された後、必要に応じて所定の熱処理を受け、ある
いはさらに冷間引抜により所定の外径にされた後、機械
構造用鋼管として使用される。According to the present invention, the steel composed of the above chemical components is melted in a converter, an electric furnace, etc., and is hot-rolled through the steps of ingot-agglomeration or continuous casting. After that, if necessary, cold rolling is performed, pipe forming-electric resistance welding, and then, if necessary, a predetermined heat treatment, or further cold drawing to a predetermined outer diameter, and then the machine. Used as a structural steel pipe.
【００１９】[0019]
【実施例】表１、表２（表１のつづき）は本発明を実施
するにあたって使用に供した鋼の化学組成を示したもの
である。表１、表２に示した成分の鋼を溶製し、連続鋳
造、熱間圧延を行った後、電気抵抗溶接を行い、φ５
０．８×ｔ５．０ｍｍの電気抵抗溶接管を製造した。ま
た、製管後の全ての管について超音波探傷（ＵＳＴ）を
実施した。この際のＵＳＴの歩留値と実用試験結果につ
いて表３に示す。さらに、製管後、必要に応じて熱処
理、冷間引抜を行い、旋盤を用いて切削試験を実施し
た。その結果も併せて表３に示す。これらの結果をまと
めて模式的に図１、図２に本発明の効果を示す。EXAMPLES Tables 1 and 2 (continued from Table 1) show the chemical compositions of steels used for carrying out the present invention. Steels having the components shown in Tables 1 and 2 were melted, continuously cast, hot-rolled, and then electric resistance welded to obtain φ5.
An electric resistance welded tube of 0.8 × t5.0 mm was manufactured. In addition, ultrasonic flaw detection (UST) was performed on all the pipes after the pipe manufacturing. Table 3 shows the UST yield value and the results of the practical test at this time. Furthermore, after pipe making, heat treatment and cold drawing were carried out if necessary, and a cutting test was carried out using a lathe. The results are also shown in Table 3. These results are summarized and the effects of the present invention are schematically shown in FIGS. 1 and 2.
【００２０】なお、切削試験は、回転数３００〜８００
ＲＰＭ、送り０．１０〜０．５０ｍｍ／ｒｅｖ．、切削
速度５０〜２００ｍｍ／ｍｉｎ．、切込み１．５ｍｍの
切削条件で超硬工具を用いて実施し、切屑を採取した。
ここで、切屑処理指数は、切屑長さ５０ｍｍ以下が得ら
れる条件数の全条件数に対する百分率で示した。表２お
よび図１より、Ｓレベルの低い従来の機械構造用電気抵
抗溶接鋼管は、ＵＳＴ時の歩留は良好であるが、切屑処
理性が劣ること、Ｓレベルの高い従来の快削鋼を素材と
した場合には、切屑処理性は良好であるが、ＵＳＴ時の
歩留が著しく劣ることが分かる。さらに、Ｓ、Ｎ、Ｏの
量を、本発明で示した範囲に特定することにより、歩留
を著しく低下させることなく、切屑処理性の良好な電気
抵抗溶接鋼管を製造することが可能であることが分か
る。さらに、図２よりＳ、Ｎおよび、Ｓｎ、Ｓｂの１種
以上との複合効果により、冷間加工材においても、切屑
処理性が良好であることが分かる。In the cutting test, the rotation speed is 300 to 800.
RPM, feed 0.10 to 0.50 mm / rev. , Cutting speed 50 to 200 mm / min. The cutting was performed by using a cemented carbide tool under a cutting condition of a cut of 1.5 mm, and chips were collected.
Here, the chip treatment index is shown as a percentage of the total number of conditions for obtaining a chip length of 50 mm or less. From Table 2 and FIG. 1, the conventional electric resistance welded steel pipe for machine structure having a low S level has a good yield at the time of UST, but is inferior in chip disposability, and the conventional free cutting steel having a high S level is used. It can be seen that when the material is used, the chip disposability is good, but the yield during UST is significantly inferior. Furthermore, by specifying the amounts of S, N, and O within the ranges shown in the present invention, it is possible to manufacture an electric resistance welded steel pipe having good chip disposability without significantly reducing the yield. I understand. Further, it can be seen from FIG. 2 that due to the combined effect of one or more of S, N and Sn, Sb, the chip disposability is good even in the cold-worked material.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【表３】 [Table 3]
【００２４】[0024]
【発明の効果】以上の実施例からも分かるように、Ｓ、
Ｏの量を本発明で示した範囲に特定することにより、Ｕ
ＳＴ時の歩留の低下はほとんどない。さらにＳ、Ｎおよ
び、Ｓｎ、Ｓｂの１種以上の複合効果により、その被削
性は非常に良好である。本発明により、被削性の優れた
機械構造用電気抵抗溶接鋼管を製造することが可能とな
った。As can be seen from the above embodiments, S,
By specifying the amount of O in the range shown in the present invention, U
There is almost no decrease in yield at ST. Furthermore, the machinability is very good due to the combined effect of one or more of S, N and Sn, Sb. According to the present invention, it has become possible to manufacture an electric resistance welded steel pipe for machine structure having excellent machinability.
【図１】本発明の効果について模式的に示した図であ
る。FIG. 1 is a diagram schematically showing an effect of the present invention.
【図２】本発明の効果について模式的に示した図であ
る。FIG. 2 is a diagram schematically showing an effect of the present invention.
Claims (3)
０．０４０％の１種以上を合計０．０５０％以下含有
し、残部鉄および不可避的不純物からなることを特徴と
する被削性の優れた機械構造用電気抵抗溶接鋼管。1. C: 0.02 to 0.60%, Si: 0.4% or less, Mn: 0.20 to 2.0%, P: 0.030% or less, S: 0 in weight% 0.040% or less, T.I. Al: 0.001-0.030%, N: 0.0020-0.0100%, O: 0.0060% or less are included, and Sn: 0.002-0.040%, Sb: 0.002-
An electric resistance welded steel pipe for machine structure having excellent machinability, which contains 0.040% or more of 0.040% or more in total of 0.050% or less and is composed of the balance iron and unavoidable impurities.
０．０４０％、Ｔｅ：０．００２〜０．０４０％の１種
以上を合計０．０５０％以下添加したことを特徴とする
請求項１記載の被削性の優れた機械構造用電気抵抗溶接
鋼管。2. Further, Bi: 0.002-0.040%, Pb: 0.002-
The electrical resistance welding for machine structure having excellent machinability according to claim 1, wherein one or more of 0.040% and Te: 0.002 to 0.040% is added in total of 0.050% or less. Steel pipe.
削性の優れた機械構造用電気抵抗溶接鋼管。3. A machine with excellent machinability according to claim 1, further comprising Cr: 0.10 to 1.50% and Mo: 0.10 to 0.60%. Structural electric resistance welded steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4077979A JPH05279792A (en) | 1992-03-31 | 1992-03-31 | Electric resistance welded steel tube for machine structure excellent in machinability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4077979A JPH05279792A (en) | 1992-03-31 | 1992-03-31 | Electric resistance welded steel tube for machine structure excellent in machinability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05279792A true JPH05279792A (en) | 1993-10-26 |
Family
ID=13649009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4077979A Pending JPH05279792A (en) | 1992-03-31 | 1992-03-31 | Electric resistance welded steel tube for machine structure excellent in machinability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05279792A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161421A (en) * | 1974-11-27 | 1976-05-28 | Nippon Steel Corp | TAISUTETSUPUKURATSUKUSEIOKOJOSESHIMETA PAIPURAINYOKO |
| JPS5585658A (en) * | 1978-12-25 | 1980-06-27 | Daido Steel Co Ltd | Free cutting steel |
| JPS57140854A (en) * | 1981-02-23 | 1982-08-31 | Nippon Steel Corp | Machine structural steel with superior machinability |
| JPS5970747A (en) * | 1982-10-12 | 1984-04-21 | Kawasaki Steel Corp | Free-cutting alloy steel for machine structure use |
| JPS62274048A (en) * | 1986-05-21 | 1987-11-28 | Daido Steel Co Ltd | Free-cutting steel |
-
1992
- 1992-03-31 JP JP4077979A patent/JPH05279792A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161421A (en) * | 1974-11-27 | 1976-05-28 | Nippon Steel Corp | TAISUTETSUPUKURATSUKUSEIOKOJOSESHIMETA PAIPURAINYOKO |
| JPS5585658A (en) * | 1978-12-25 | 1980-06-27 | Daido Steel Co Ltd | Free cutting steel |
| JPS57140854A (en) * | 1981-02-23 | 1982-08-31 | Nippon Steel Corp | Machine structural steel with superior machinability |
| JPS5970747A (en) * | 1982-10-12 | 1984-04-21 | Kawasaki Steel Corp | Free-cutting alloy steel for machine structure use |
| JPS62274048A (en) * | 1986-05-21 | 1987-11-28 | Daido Steel Co Ltd | Free-cutting steel |
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