JPH07116554B2 - Electric resistance welded steel pipe for machine structure with excellent machinability - Google Patents
Electric resistance welded steel pipe for machine structure with excellent machinabilityInfo
- Publication number
- JPH07116554B2 JPH07116554B2 JP1316401A JP31640189A JPH07116554B2 JP H07116554 B2 JPH07116554 B2 JP H07116554B2 JP 1316401 A JP1316401 A JP 1316401A JP 31640189 A JP31640189 A JP 31640189A JP H07116554 B2 JPH07116554 B2 JP H07116554B2
- Authority
- JP
- Japan
- Prior art keywords
- electric resistance
- steel pipe
- resistance welded
- steel
- less
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims description 28
- 239000010959 steel Substances 0.000 title claims description 28
- 229910052791 calcium Inorganic materials 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 description 13
- 238000003466 welding Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910000915 Free machining steel Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】 （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。TECHNICAL FIELD The present invention relates to an electric resistance welded steel pipe for machine structure having excellent machinability.
（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。(Prior Art) With the progress of cutting technology and the increase in production of automobiles and other machines, the need for steel materials with 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 higher efficiency.
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57−140
853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快削鋼及びこれらの複合快
削鋼が開発され、実用化されている。しかしながら、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、これらの快削鋼の快削性元素が生成
する介在物は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。なお、これらの介在物による機械
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
ものもあるが、電気抵抗溶接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はなく、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。Regarding general machine structural steel, in order to improve machinability, for example, JP-A-55-85658 and JP-A-57-140 are used.
The S-based free-cutting steel, Pb free-cutting steel, Ca free-cutting steel, and their composite free-cutting steels as shown in Japanese Patent No. 853 and Japanese Patent Laid-Open No. 62-33747 have been developed and put into practical use. . However, when attempting to manufacture a steel pipe for machine structure having good machinability by electric resistance welding, inclusions generated by the free-cutting elements of these free-cutting steels deteriorate the electric resistance weldability and cause weld cracking, It cannot be used as a material for electric resistance welded pipes, as it causes a large decrease in yield due to UST failure during ultrasonic flaw detection tests. Incidentally, in order to prevent deterioration of mechanical properties due to these inclusions, as shown in Japanese Examined Patent Publication No. 61-16337, sol.Al is limited and the amount of S, Ca, O is specified. When it is used as a material for electric resistance welding, it does not 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.
（発明が解決しようとする課題） 本発明は、被削性の優れた機械構造用電縫鋼管を製造す
るにあたって、従来の快削鋼では、快削性元素が生成す
る介在物は、電気抵抗溶接性を著しく劣化させ、溶接割
れ、UST不良などの原因となるため、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という問題点を解
決し、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。(Problems to be Solved by the Invention) In the present invention, in producing an electric resistance welded steel pipe for machine structure having excellent machinability, in the conventional free-cutting steel, inclusions generated by the free-cutting element have an electrical resistance. Solves the problem that it cannot be used as a material for electric resistance welded pipes, because it significantly deteriorates weldability and causes weld cracks, UST defects, etc., and improves the machinability of ERW steel pipes for machine structures. It was designed to meet the demand.
（課題を解決するための手段） 本発明の請求項１は、重量％で、C:0.02〜0.60％、Si:
0.4％以下、Mn:0.20〜2.0％、P:0.030％以下、S:0.020
〜0.050％、sol.Al:0.005〜0.040％、N:0.0060％以下、
O:0.0060％以下、Ca:0.002〜0.005％でかつ、Ca％／
（1.25×Ｏ％＋0.625×Ｓ％）≧0.05、 を含有し、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
を要旨とするものであり、 本発明の請求項２は、本発明の請求項１に示した成分元
素に加え、さらにCr:0.10〜1.50％、Mo:0.10〜0.60％添
加した被削性の優れた機械構造用電気抵抗溶接鋼管を要
旨とするものである。(Means for Solving the Problems) Claim 1 of the present invention is, in% by weight, C: 0.02 to 0.60%, Si:
0.4% or less, Mn: 0.20 to 2.0%, P: 0.030% or less, S: 0.020
~ 0.050%, sol.Al: 0.005-0.040%, N: 0.0060% or less,
O: 0.0060% or less, Ca: 0.002 to 0.005% and Ca% /
(1.25 x O% + 0.625 x S%) ≥ 0.05, and is composed of the balance iron and inevitable impurities, and is characterized by an electric resistance welded steel pipe for machine structure with excellent machinability. According to claim 2 of the present invention, in addition to the component elements shown in claim 1 of the present invention, Cr: 0.10 to 1.50%, Mo: 0.10 to 0.60% are added to a machine structure having excellent machinability. The main point is electric resistance welded steel pipe.
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,Ca,Oの量を特定したことを特徴としている。Here, the present invention is characterized in that the amount of S, Ca, O of the raw material is specified in order to enable the production of an electric resistance welded steel pipe having good chip disposability with a good yield.
（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
本発明の鋼の成分範囲を定めた理由について説明する。(Operation) The details of the present invention will be described below, and the reason for defining the component range of the steel of the present invention as described above will be described.
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,C
a,Oの量を特定することにより、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ている。The present invention is intended to produce a steel pipe for mechanical structure having good chip disposability by electric resistance welding, S, C
By specifying the amounts of a and O, it is possible to suppress a significant decrease in yield due to welding cracks and UST defects during electric resistance welding due to inclusions of free-cutting components.
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。C is essential to secure mechanical strength, so the lower limit was made 0.02%. Further, if it exceeds 0.60%, the toughness and machinability deteriorate, and at the time of electric resistance welding for pipe manufacturing,
Due to the heat effect, it hardens significantly and the workability is impaired.
The upper limit was set to 0.60%.
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。Si is an element contained in deoxidized upper steel, but if added in excess, it reduces ductility and also deteriorates the surface properties of the work material due to the formation of Si scale, which also deteriorates the machinability. The value was 0.4%.
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。Mn is an element that is generally indispensable for securing the strength and toughness of steel, and also has the meaning of avoiding hot brittleness due to S.
The lower limit was 0.20%. However, excessive addition deteriorates workability and weldability, so the content was made 2.0% or less.
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。P is an element that generally improves the machinability by forming a solid solution in steel to embrittle the material, but if this amount is large, the electric resistance weldability deteriorates. Therefore, the upper limit is 0.030.
%.
Ｓは、切屑処理性を改善するためには、最低限0.020％
は必要である。しかし、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、
後述のＯの量を前提として、その上限値を0.050％とし
た。S is a minimum of 0.020% in order to improve chip disposability.
Is necessary. However, as the amount of S increases, welding cracks during electric resistance welding for pipe manufacturing, and during ultrasonic testing
As it may cause a large decrease in yield due to UST failure,
Assuming the amount of O described below, the upper limit value was set to 0.050%.
sol.Alは、一般に脱酸上含まれる元素であり、0.005未
満では、鋼中の酸素量が増大するため、その下限を0.00
5％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0.040％と
した。sol.Al is an element generally included in deoxidation, and if it is less than 0.005, the amount of oxygen in steel increases, so its lower limit is 0.00
It was set to 5%. On the other hand, Al deteriorates the machinability of steel due to the formation of alumina clusters, so the upper limit was made 0.040%.
Ｎは、固溶硬化作用を通じて強度を上昇させる効果を有
している。また、被削性に対しても有効な元素である。
しかながら、0.0060％を超えて添加すると溶接性を劣化
させることから、その範囲を0.0060％以下とした。N has the effect of increasing the strength through the solid solution hardening action. It is also an effective element for machinability.
However, if added in excess of 0.0060%, the weldability deteriorates, so the range was made 0.0060% or less.
Ｏは、前述のＳ量、sol.Al量を前提とした場合、0.0060
％を超える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、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。O is 0.0060 when the S amount and sol.Al amount described above are assumed.
%, The oxide content increases, which causes UST failure during ultrasonic flaw detection testing. In addition, the formation of Ca oxide reduces the Ca content for controlling the morphology of sulfide MnS described below. Therefore, the upper limit was made 0.0060%.
Caは、0.002％以上の添加によって、硫化物MnSの形態を
制御し靱性を向上させる効果を有しているほか、酸化物
生成により工具寿命、切削抵抗を良好とする。一方、0.
005％を超えて添加すると大型介在物となり、靱性、電
気抵抗溶接性に悪影響を及ぼす。このため添加量の範囲
を0.002〜0.005％に制限した。Ca, when added in an amount of 0.002% or more, has the effect of controlling the morphology of sulfide MnS and improving toughness, and also improves the tool life and cutting resistance by forming oxides. On the other hand, 0.
If added in excess of 005%, it will become large inclusions, adversely affecting toughness and electric resistance weldability. Therefore, the range of addition amount is limited to 0.002 to 0.005%.
さらに、Ca％／（1.25×Ｏ％＋0.625×Ｓ％）を0.05以
上とすることで、製管のための電気抵抗溶接の際のUST
不良の原因となるMnSの展伸を抑える効果を発揮させる
ことができる。なお、上式の分母は、CaがCaSとしてＳ
と有効に結びつき硫化物の多くを楕円状化してMnSの展
伸を抑制し、さらに、Ca、Alが有効に結びついて低融点
酸化物CaO・Al2O3を生成するために必要なCa量を表して
いる。Further, by setting Ca% / (1.25 × O% + 0.625 × S%) to 0.05 or more, UST for electric resistance welding for pipe manufacturing
It is possible to exert the effect of suppressing the spread of MnS that causes defects. In the denominator of the above equation, Ca is CaS and S
The amount of Ca required to effectively form a sulphide and suppress the spreading of MnS by forming an ellipsoidal shape of most of the sulfides, and to effectively combine Ca and Al to form the low-melting oxide CaO ・ Al 2 O 3. Is represented.
また、本発明は、0.10％以上のCr,Mo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％,0.60％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,V,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 0.10% or more of Cr and Mo alloying elements are added, and can be applied to various alloy steels including carbon steel. However, also for these elements, the addition of a large amount reduces the machinability of the alloy steel for machine structural use, so the upper limits were set to 1.50% and 0.60%, respectively. Further, if necessary, Nb, V, W or the like may be added in order to make the crystal grains finer and improve the toughness. Further, it is possible to improve mechanical properties by incorporating REM (rare earth element) in the present invention.
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、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 composition is a converter,
It is melted in an electric furnace or the like, and is hot-rolled through a process of ingot-segmentation or continuous casting. After this, if necessary, cold-rolled, after pipe forming-electric resistance welding,
If necessary, it is subjected to a predetermined heat treatment and used as a steel pipe for machine structures.
（実施例） 第１表は、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。第１表に示した成分の
鋼を溶製、連続鋳造、熱間圧延を行った後、電気抵抗溶
接を行い、φ50.8×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（US
T）を実施した。この際のUSTの歩留値と実用試験結果に
ついて第２表に示す。さらに、製管後、必要に応じて熱
処理を行ない、旋盤によって切削試験を実施した。その
結果も併せて、第２表に示す。これらの結果をまとめ
て、模式的に第１図に示す。(Example) Table 1 shows the chemical composition of the steel used for practicing the present invention. Steel having the components shown in Table 1 was melted, continuously cast, hot-rolled, and then electric resistance welded to produce an electric resistance welded pipe of φ50.8 × t5.0 mm. In addition, ultrasonic flaw detection (US
T) was carried out. Table 2 shows the yield value of UST and the results of practical tests at this time. Further, after the pipe was manufactured, a heat treatment was performed if necessary, and a cutting test was performed by a lathe. The results are also shown in Table 2. These results are summarized and shown schematically in FIG.
なお、切削試験は、回転数300〜800RPM,送り0.10〜0.50
mm/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、切屑処理性指数は、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。In the cutting test, the rotation speed is 300 to 800 RPM, and the feed is 0.10 to 0.50.
mm / rev., cutting speed 50-200 mm / min., and cutting depth of 1.5 mm were carried out using a cemented carbide tool to collect chips. Here, the chip disposability index is shown as a percentage of the total number of conditions for obtaining a chip length of 50 mm or less.
第２表、第１図より、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わかる。さらに、S,Ca,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、切削処理性の良好な電気抵
抗溶接鋼管を製造するとが可能であることが分かる。From Table 2 and Fig. 1, conventional electric resistance welded steel pipes with low S level for machine structure have good yield at UST, but poor chip disposability, and conventional free cutting with high S level. When steel is used as the material, the chip disposability is good, but the yield at UST is significantly inferior. Furthermore, by specifying the amount of S, Ca, O in the range shown in the present invention, it is possible to produce an electric resistance welded steel pipe having good cutting processability without significantly reducing the yield. I understand.
（発明の効果） 以上の実施例からも分かるように、S,Ca,Oの量を、本発
明で示した範囲に特定ることにより、UST時の歩留の低
下はほとんどない。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。 (Effects of the Invention) As can be seen from the above examples, by specifying the amounts of S, Ca, and O within the ranges shown in the present invention, there is almost no decrease in the yield during UST. According to the present invention, it has become possible to manufacture an electric resistance welded steel pipe for machine structure having excellent machinability.
第１図は、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 the effect of the present invention.
Claims (2)
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。[Claim 1] C: 0.02-0.60%, Si: 0.4% or less, Mn: 0.20-2.0%, P: 0.030% or less, S: 0.020-0.050%, sol.Al:0.005-0.040% , N: 0.0060% or less, O: 0.0060% or less, Ca: 0.002 to 0.005%, and contains Ca% / (1.25 × O% + 0.625 × S%) ≧ 0.05, and the balance is iron and inevitable impurities. An electric resistance welded steel pipe with excellent machinability for machine structures.
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。2. C: 0.02-0.60%, Si: 0.4% or less, Mn: 0.20-2.0%, P: 0.030% or less, S: 0.020-0.050%, Cr: 0.10-1.50%, Mo : 0.10 to 0.60%, Sol.Al: 0.005 to 0.040%, N: 0.0060% or less, O: 0.0060% or less, Ca: 0.002 to 0.005% and Ca% / (1.25 x O% + 0.625 x S%) An electric resistance welded steel pipe for machine structure having excellent machinability, characterized by containing ≧ 0.05 and consisting of the balance iron and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316401A JPH07116554B2 (en) | 1989-12-07 | 1989-12-07 | Electric resistance welded steel pipe for machine structure with excellent machinability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316401A JPH07116554B2 (en) | 1989-12-07 | 1989-12-07 | Electric resistance welded steel pipe for machine structure with excellent machinability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03177539A JPH03177539A (en) | 1991-08-01 |
| JPH07116554B2 true JPH07116554B2 (en) | 1995-12-13 |
Family
ID=18076665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1316401A Expired - Lifetime JPH07116554B2 (en) | 1989-12-07 | 1989-12-07 | Electric resistance welded steel pipe for machine structure with excellent machinability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07116554B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0774413B2 (en) * | 1990-01-30 | 1995-08-09 | 新日本製鐵株式会社 | Electric resistance welded steel pipe for machine structure with excellent machinability |
| JPH10287953A (en) * | 1997-04-16 | 1998-10-27 | Daido Steel Co Ltd | Steel for machine structural use, excellent in mechanical property and drilling property |
| WO2001059170A1 (en) * | 2000-02-10 | 2001-08-16 | Aichi Steel Works, Ltd. | Machine structural steel being free of lead, excellent in machinability and reduced in strength anisotropy |
| JP2004332078A (en) * | 2003-05-09 | 2004-11-25 | Sanyo Special Steel Co Ltd | Free-cutting steel for machine structure use excellent in scrap disposal |
| JP5142068B2 (en) * | 2006-05-17 | 2013-02-13 | 日産自動車株式会社 | High strength steel plate for resistance spot welding and joining method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56142850A (en) * | 1980-04-09 | 1981-11-07 | Nippon Steel Corp | Steel for mechanical structure having excellent grindability and cold processability |
| JPS57140854A (en) * | 1981-02-23 | 1982-08-31 | Nippon Steel Corp | Machine structural steel with superior machinability |
-
1989
- 1989-12-07 JP JP1316401A patent/JPH07116554B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03177539A (en) | 1991-08-01 |
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