JPH08239732A - Production of resistance welded tube excllent in wear resistance - Google Patents
Production of resistance welded tube excllent in wear resistanceInfo
- Publication number
- JPH08239732A JPH08239732A JP4295895A JP4295895A JPH08239732A JP H08239732 A JPH08239732 A JP H08239732A JP 4295895 A JP4295895 A JP 4295895A JP 4295895 A JP4295895 A JP 4295895A JP H08239732 A JPH08239732 A JP H08239732A
- Authority
- JP
- Japan
- Prior art keywords
- electric resistance
- resistance welded
- heat treatment
- wear resistance
- resistance
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電縫溶接部の靱性を
的確に向上せしめることにより、耐摩耗性が要求される
用途に用いることが可能な耐摩耗性に優れる電縫鋼管の
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electric resistance welded steel pipe having excellent wear resistance, which can be used in applications where abrasion resistance is required by appropriately improving the toughness of the electric resistance welded portion. Regarding
【０００２】[0002]
【従来の技術】都市におけるごみ輸送や鉱山における鉱
石スラリー等のスラリー状物質等の硬質物を含む物質の
輸送管として電縫鋼管が使用されている。この用途に使
用される電縫鋼管には優れた耐摩耗性が要求される。2. Description of the Related Art ERW steel pipes are used as transportation pipes for transporting refuse in cities and transporting substances including hard substances such as slurry-like substances such as ore slurry in mines. ERW steel pipes used for this purpose are required to have excellent wear resistance.
【０００３】耐摩耗性は鋼硬度の上昇に伴い向上するこ
とが知られている。多量の合金元素を含む鋼を用いて電
縫溶接し、電縫鋼管とした後に管全体を熱処理して高硬
度とすることにより耐摩耗性を向上させることが行われ
ているが、添加する合金元素が高価であり、あるいは管
全体を加熱するための熱処理設備が大規模となり設備費
用、熱処理費用が高価であるという問題点がある（特開
平５−９８３５１号公報等）。It is known that wear resistance improves as the hardness of steel increases. It has been carried out to improve wear resistance by performing electric resistance welding using steel containing a large amount of alloy elements to form an electric resistance welded steel tube and then heat-treating the entire tube to make it highly hard. There is a problem that the element is expensive, or the heat treatment equipment for heating the entire tube becomes large in scale, and the equipment cost and heat treatment cost are expensive (Japanese Patent Laid-Open No. 5-98351, etc.).
【０００４】また、管内面を耐摩耗性のある高硬度の組
織とし、内面以外の部位に変形性能をもたせた技術が開
示されている。例えば、特公昭６１−３３７４号公報に
は、製管後管体を加熱して管内面のみを焼き入れる技
術、特開平３−２６７３１５号公報には、素材鋼板を熱
間圧延し製造する段階で、管内面となる片面のみを焼き
入れる技術が開示されている。しかし、これらの技術に
よるものは硬化層の厚さが薄いことから、硬化層が摩耗
により減少するような環境では、長期間使用できないと
いう問題点がある。Further, there is disclosed a technique in which the inner surface of the tube has a structure of high hardness with wear resistance, and a portion other than the inner surface has a deformability. For example, Japanese Patent Publication No. 61-3374 discloses a technique of heating a tubular body after pipe making to quench only the inner surface of the pipe, and Japanese Laid-Open Patent Publication No. 3-267315 discloses hot rolling of a raw steel sheet. A technique for quenching only one side of the inner surface of the pipe is disclosed. However, these techniques have a problem that they cannot be used for a long period of time in an environment where the hardened layer is reduced due to wear, because the hardened layer is thin.
【０００５】これらの問題点を改善した技術として、特
開平６−１７１８８号公報に開示される技術がある。こ
の技術は鋼組織を、軟質な地組織中に硬質の組織を分散
させた複合組織とすることにより、耐摩耗性と加工性を
両立させたものであり、特定の組成の成分を含む鋼につ
いて、フェライトあるいはベイナイトからなる地組織中
に硬質の島状マルテンサイトを５％以上の面積分率で分
散した組織の鋼材とすることにより加工性と耐摩耗性を
両立させたものであり、耐摩耗性の優れた安価な溶接鋼
管用素材として好適である。As a technique for solving these problems, there is a technique disclosed in Japanese Patent Laid-Open No. 6-17188. This technology makes the steel structure a composite structure in which a hard structure is dispersed in a soft ground structure to achieve both wear resistance and workability. , A steel material having a structure in which hard island martensite is dispersed at an area fraction of 5% or more in a ground structure made of ferrite or bainite to achieve both workability and wear resistance. It is suitable as an inexpensive welded steel pipe material with excellent properties.
【０００６】[0006]
【発明が解決しようとする課題】本発明者らは前記技術
に開示されている鋼材を用いて電縫溶接鋼管を製造し
た。その結果、溶接ままの鋼管は溶接部の靱性が劣って
おり、また溶接後電縫溶接部に常用される熱処理を施し
たものは、溶接部の硬度が母材に比べて大幅に低下し、
母材の持つ優れた耐摩耗性を十分に生かすことができな
いため、この電縫鋼管を耐摩耗性が要求される用途に使
用出来ないことがわかった。本発明は、かかる点を勘案
してなされたものであり、耐摩耗性に優れた溶接鋼管を
安価に得ることのできる電縫溶接鋼管の製造方法を提供
することを目的とする。The present inventors manufactured an electric resistance welded steel pipe using the steel materials disclosed in the above-mentioned technology. As a result, the as-welded steel pipe is inferior in toughness of the welded portion, and the one subjected to the heat treatment that is commonly used for the electric resistance welded portion after welding has a significantly lower hardness of the welded portion than the base metal,
It was found that this electric resistance welded steel pipe cannot be used for applications requiring abrasion resistance because the excellent abrasion resistance of the base metal cannot be fully utilized. The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing an electric resistance welded steel pipe that enables inexpensive production of a welded steel pipe having excellent wear resistance.
【０００７】[0007]
【課題を解決するための手段】本発明者らは上記の問題
点を改善するために電縫溶接鋼管の熱処理条件について
詳細に検討した。その結果、電縫溶接部を常用される熱
処理温度よりも大幅に高い温度域で熱処理することによ
り、電縫溶接部について、靱性を損なうことなく、その
硬度を母材と同等にすることが可能であることを見出し
た。本発明はこのような知見に基づいてなされたもので
あり、その特徴とする構成は次のとおりである。DISCLOSURE OF THE INVENTION The present inventors have studied in detail the heat treatment conditions for electric resistance welded steel pipes in order to improve the above problems. As a result, the hardness of the electric resistance welded part can be made equal to that of the base metal without impairing the toughness by heat treating the electric resistance welded part in a temperature range significantly higher than the commonly used heat treatment temperature. I found that. The present invention has been made on the basis of such knowledge, and the characteristic configuration thereof is as follows.
【０００８】（１）ｗｔ％で、Ｃ：０．０５〜０．２０
％、Ｓｉ：０．５０〜２．００％、Ｍｎ：０．５０〜
２．５０％を含有し、フェライトまたはベイナイトから
なる地組織中に面積分率で５％以上の島状マルテンサイ
トを分散した組織の鋼材を用いて電縫溶接後、引続き電
縫溶接部を１０００〜１１５０℃の温度に加熱して熱処
理する耐摩耗性に優れた電縫鋼管の製造方法。(1) wt%, C: 0.05 to 0.20
%, Si: 0.50 to 2.00%, Mn: 0.50
After electric resistance welding using a steel material containing 2.50% and having island-like martensite having an area fraction of 5% or more dispersed in the ground structure made of ferrite or bainite, the electric resistance welded portion is continuously subjected to 1000 A method for producing an electric resistance welded steel pipe having excellent wear resistance, which comprises heating to a temperature of ˜1150 ° C. and heat treatment.
【０００９】（２）ｗｔ％で、Ｃ：０．０５〜０．２０
％、Ｓｉ：０．５０〜２．００％、Ｍｎ：０．５０〜
２．５０％、さらにＣｕ：０．０５〜１．００％、Ｎ
ｉ：０．０５〜２．００％、Ｃｒ：０．０５〜０．５
％、Ｍｏ：０．０５〜０．５％、Ｎｂ：０．００５〜
０．１０％、Ｖ：０．００５〜０．１０％、Ｔｉ：０．
００５〜０．１０％、Ｂ：３〜２０ｐｐｍの内から選ば
れた一種以上を含有し、フェライトまたはベイナイトか
らなる地組織中に面積分率で５％以上の島状マルテンサ
イトを分散した組織の鋼材を用いて電縫溶接後、引続き
電縫溶接部を１０００〜１１５０℃の温度に加熱して熱
処理する耐摩耗性に優れた電縫鋼管の製造方法。(2) wt%, C: 0.05 to 0.20
%, Si: 0.50 to 2.00%, Mn: 0.50
2.50%, further Cu: 0.05-1.00%, N
i: 0.05 to 2.00%, Cr: 0.05 to 0.5
%, Mo: 0.05 to 0.5%, Nb: 0.005
0.10%, V: 0.005 to 0.10%, Ti: 0.
005 to 0.10%, B: 3 to 20 ppm, containing at least one selected from the group consisting of ferrite or bainite in a ground structure of 5% or more in area fraction of island-like martensite dispersed structure A method for producing an electric resistance welded steel pipe having excellent wear resistance, which comprises performing electric resistance welding using a steel material and subsequently heating the electric resistance welded portion to a temperature of 1000 to 1150 ° C to perform heat treatment.
【００１０】[0010]
【作用】以下、本発明について説明する。The present invention will be described below.
【００１１】本発明者らは、安価な電縫鋼管を得るため
には、電縫溶接後に、オンラインで溶接部を含む鋼管の
一部分について熱処理することが有利であり、かつ短時
間の熱処理を可能とすることがオンラインの熱処理に不
可欠であると考えて、常用の熱処理温度よりも高温域に
おける熱処理を検討した。その結果、常用の熱処理温度
より大幅に高い温度で熱処理することにより溶接部の硬
度を母材と同等にできるのみならず、その靱性が母材と
同等以上にすることができることを見出した。In order to obtain an inexpensive electric resistance welded steel pipe, it is advantageous for the present inventors to perform a heat treatment on a part of the steel pipe including the welded portion online after the electric resistance welding, and the heat treatment for a short time is possible. Since it was considered that the above was indispensable for online heat treatment, heat treatment in a temperature range higher than the usual heat treatment temperature was investigated. As a result, it was found that not only the hardness of the welded portion can be made equal to that of the base material but also the toughness thereof can be made equal to or higher than that of the base material by heat treatment at a temperature significantly higher than the normal heat treatment temperature.
【００１２】表１の鋼Ａの組成の厚さ１２ｍｍの鋼材を
７８０℃に再加熱後、２０℃／秒で冷却して、硬度がＨ
ｖ２５３、島状マルテンサイトの面積分率が２１％の電
縫鋼管用の素材鋼材を製造した。この鋼材を用いて溶接
速度１０．０ｍ／分、入力１７５ｋｗの条件で電縫溶接
をして電縫鋼管を製造した。この電縫鋼管の溶接部を誘
導加熱による熱処理シュミレーターにより、表２に記載
の熱処理条件により熱処理した。熱処理後の鋼管の母
材、溶接部の硬度、靱性を調査した。硬度はＨｖ（荷重
５００ｇ）により測定した。靱性はシャルピー試験によ
り、０℃におけるシャルピー吸収エネルギーを測定し
た。調査結果を図１に示す。A steel material having a composition of steel A shown in Table 1 and having a thickness of 12 mm was reheated to 780 ° C. and then cooled at 20 ° C./sec.
v253, a raw material steel material for an electric resistance welded steel pipe having an area fraction of island martensite of 21% was manufactured. Using this steel material, electric resistance welding was performed under the conditions of a welding speed of 10.0 m / min and an input of 175 kw to manufacture an electric resistance welded steel pipe. The welded portion of this electric resistance welded steel pipe was heat-treated under the heat treatment conditions shown in Table 2 by a heat treatment simulator using induction heating. The hardness and toughness of the base material and welds of the steel pipe after heat treatment were investigated. The hardness was measured by Hv (load 500 g). The toughness was measured by Charpy absorbed energy at 0 ° C. by the Charpy test. The survey results are shown in FIG.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】加熱温度が１０００℃未満では、電縫溶接
部の靱性が優れるが硬度は著しく低下する。加熱温度が
低いために、焼き入れ性が不十分となり、フェライトと
パーライトの軟化組織が生成され、フェライトの存在に
より靱性が優れるが、硬質な島状マルテンサイトが生成
されないので硬度が著しく低下したと考えられる。When the heating temperature is less than 1000 ° C., the toughness of the electric resistance welded portion is excellent, but the hardness is remarkably lowered. Since the heating temperature is low, the hardenability becomes insufficient, the softening structure of ferrite and pearlite is generated, and the toughness is excellent due to the presence of ferrite, but the hardness is significantly reduced because the hard island martensite is not generated. Conceivable.
【００１６】加熱温度が１０００℃以上になると、電縫
溶接部の硬度は母材と同等のＨｖ２４０以上になり、靱
性も優れる。加熱後の焼き入れ性が十分であるので、フ
ェライトに加えて島状マルテンサイトが生成されてい
る。硬質の島状マルテンサイトが生成されているので硬
度は母材と同等になり、また、軟質なフェライトが形成
されていることに加えて熱処理時に生成した島状マルテ
ンサイトが焼き戻りにより軟化したために母材と同等以
上の靱性を示したと考えられる。When the heating temperature is 1000 ° C. or higher, the hardness of the electric resistance welded portion becomes Hv240 or higher, which is equivalent to that of the base material, and the toughness is excellent. Since the hardenability after heating is sufficient, island-like martensite is formed in addition to ferrite. Since hard island martensite is generated, the hardness becomes equivalent to that of the base metal, and in addition to the soft ferrite being formed, the island martensite produced during heat treatment is softened by tempering. It is considered that the toughness was equal to or higher than that of the base metal.
【００１７】しかし、加熱温度が１１５０℃を超えると
電縫溶接部の硬度がさらに高くなり、靱性が著しく低下
する。これはオーステナイト粒径の粗大化により焼き入
れ性が増大したため、熱処理前の電縫鋼管溶接ままの組
織と同等の組織となり、電縫溶接部を熱処理した効果が
発揮できないことによると考えられる。However, if the heating temperature exceeds 1150 ° C., the hardness of the electric resistance welded portion will be further increased and the toughness will be significantly reduced. It is considered that this is because the hardenability increased due to the coarsening of the austenite grain size, resulting in a structure equivalent to the as-welded structure of the electric resistance welded steel pipe before heat treatment, and the effect of heat treatment of the electric resistance welded portion cannot be exhibited.
【００１８】以上の結果から、電縫溶接部について母材
と同等の硬度を得るには熱処理温度を１０００℃以上と
することが有効である。しかし、加熱温度は１１５０℃
を超えると電縫溶接部の硬度が過度に高くまた靱性が低
下するので、熱処理温度は１１５０℃以下とするのが望
ましい。From the above results, it is effective to set the heat treatment temperature to 1000 ° C. or higher in order to obtain the same hardness as the base metal in the electric resistance welded portion. However, the heating temperature is 1150 ° C
If it exceeds, the hardness of the electric resistance welded portion will be excessively high and the toughness will be deteriorated. Therefore, the heat treatment temperature is preferably 1150 ° C. or lower.
【００１９】つぎに本発明の限定理由について説明す
る。本発明では、電縫鋼管の素材鋼材の組織はフェライ
トまたはベイナイトからなる地組織中に面積分率で５％
以上の島状マルテンサイトが分散した組織であることが
必要である。素材鋼材の前記組織は電縫溶接後も鋼管の
母材部に残り、電縫鋼管として必要な耐摩耗性と加工性
を確保できる。地組織がフェライトまたはベイナイトで
あるので加工性が優れ、また、地組織中に分散した面積
分率で５％以上の島状マルテンサイトは高硬度であるの
で図２、図３に示す如く耐摩耗性が優れる。Next, the reasons for limitation of the present invention will be described. In the present invention, the structure of the material steel material of the electric resistance welded pipe is 5% in terms of area fraction in the ground structure composed of ferrite or bainite.
It is necessary that the above island-like martensite is dispersed. The above-described structure of the raw steel material remains in the base material portion of the steel pipe even after the electric resistance welding, and the wear resistance and workability required for the electric resistance welded steel pipe can be secured. Workability is excellent because the ground structure is ferrite or bainite, and island-shaped martensite with an area fraction of 5% or more dispersed in the ground structure has high hardness, so wear resistance as shown in FIGS. 2 and 3 Excellent in performance.
【００２０】素材鋼材を前記した組織にするために、鋼
中の基本成分として下記の含有量のＣ、Ｓｉ、Ｍｎを含
有することが不可欠である。In order to make the material steel material have the above-mentioned structure, it is indispensable to contain the following contents of C, Si and Mn as basic components in the steel.
【００２１】Ｃ：含有量を０．０５〜０．２０％とする
必要がある。高い耐摩耗性を得るために不可欠な島状マ
ルテンサイトを生成させるための必須の成分である。含
有量が０．０５％未満では、面積分率で５％以上の島状
マルテンサイトを生成することができない。また、その
量が０．２０％を超えると溶接性が劣化する。C: The content needs to be 0.05 to 0.20%. It is an essential component for producing island martensite, which is essential for obtaining high wear resistance. If the content is less than 0.05%, island martensite having an area fraction of 5% or more cannot be generated. Further, if the amount exceeds 0.20%, the weldability deteriorates.
【００２２】Ｓｉ：含有量を０．５０〜２．００％とす
る必要がある。オーステナイトの焼き入れ性を向上し、
島状マルテンサイトを生成するための必須の成分であ
る。Ｃの第２相への濃縮を助長し、第２相にパーライト
の生成を防ぎ、ベイナイトの生成を遅らせる作用があ
る。０．５０％未満では、面積分率で５％以上の島状マ
ルテンサイトを生成することができない。また、その量
が２．００％を超えると溶接性が劣化する。Si: The content must be 0.50 to 2.00%. Improves the hardenability of austenite,
It is an essential component for producing island martensite. It has the action of promoting the concentration of C in the second phase, preventing the formation of pearlite in the second phase, and delaying the formation of bainite. If it is less than 0.50%, island martensite having an area fraction of 5% or more cannot be generated. Further, if the amount exceeds 2.00%, the weldability deteriorates.
【００２３】Ｍｎ：含有量を０．５０〜２．００％とす
る必要がある。オーステナイトの焼き入れ性を上げて、
島状マルテンサイトを生成させるための必須の成分であ
る。０．５０％未満では焼き入れ効果が小さく、面積分
率で５％以上の島状マルテンサイトを生成することがで
きない。また、その量が２．５０％を超えると溶接性が
劣化する。Mn: The content must be 0.50 to 2.00%. To improve the hardenability of austenite,
It is an essential component for producing island martensite. If it is less than 0.50%, the quenching effect is small, and island martensite having an area fraction of 5% or more cannot be generated. If the amount exceeds 2.50%, the weldability deteriorates.
【００２４】本発明では、耐摩耗性を向上するために、
前記した基本の３成分に加えてさらに以下の成分元素か
ら選ばれた１種以上を鋼中に含有することができる。Ｃ
ｕ：０．０５〜１．００％、Ｎｉ：０．０５〜２．００
％、Ｃｒ：０．０５〜０．５％、Ｍｏ：０．０５〜０．
５％、Ｎｂ：０．００５〜０．１０％、Ｖ：０．００５
〜０．１０％、Ｔｉ：０．００５〜０．１０％、Ｂ：３
〜２０ｐｐｍIn the present invention, in order to improve wear resistance,
In addition to the three basic components described above, one or more selected from the following component elements can be contained in the steel. C
u: 0.05 to 1.00%, Ni: 0.05 to 2.00
%, Cr: 0.05 to 0.5%, Mo: 0.05 to 0.
5%, Nb: 0.005 to 0.10%, V: 0.005
~ 0.10%, Ti: 0.005-0.10%, B: 3
~ 20ppm
【００２５】前記の成分元素を含有することにより、オ
ーステナイトの焼き入れ性が向上し、よって、島状マル
テンサイトの面積分率があがることに加えて、固溶強
化、析出強化により、地組織および第２相の硬度が上が
り、耐摩耗性の向上に寄与する。By containing the above-mentioned component elements, the hardenability of austenite is improved, so that the area fraction of island martensite is increased, and solid solution strengthening and precipitation strengthening are performed to improve the ground structure and The hardness of the second phase is increased, which contributes to the improvement of wear resistance.
【００２６】各成分元素の限定理由については、各成分
の含有量が下限未満では、島状マルテンサイトの面積分
率の向上あるいは固溶強化、析出強化による地組織およ
び第２相の硬度上昇による耐摩耗性の向上への効果を発
揮せず、また、上限を超えると溶接性が劣化することに
よる。As for the reason for limiting each component element, if the content of each component is less than the lower limit, the area fraction of island martensite is improved or the solid structure strengthening by precipitation strengthening and the solidification of the second phase increase in hardness. This is because the effect of improving wear resistance is not exhibited, and when the upper limit is exceeded, the weldability deteriorates.
【００２７】上記した組成の鋼を用いてフェライトまた
はベイナイトからなる地組織中に面積分率で５％以上の
島状マルテンサイトの組織を得るための鋼材の製造方法
は特に限定しないが、例えば、熱間圧延した鋼材をＡｃ
1 〜Ａｃ3 温度のフェライトとオーステナイトの２相域
に加熱後冷却する方法や、鋼の母組織がアッパーベイナ
イトとなるような熱処理が例示できる。A method for producing a steel material for obtaining a structure of island-shaped martensite having an area fraction of 5% or more in a ground structure of ferrite or bainite using the steel having the above composition is not particularly limited. Hot rolled steel
Examples thereof include a method of heating in a two-phase region of ferrite and austenite at a temperature of 1 to Ac 3 and then cooling, and a heat treatment in which the base structure of steel becomes upper bainite.
【００２８】このような組織を持つ鋼材は地組織がフェ
ライトあるいはベイナイトからなるので加工性に優れて
いる。The steel material having such a structure is excellent in workability because the ground structure is made of ferrite or bainite.
【００２９】前記したフェライトまたはベイナイトから
なる地組織中に面積分率で５％以上の島状マルテンサイ
トを含む組織をもつ鋼材を素材として、電縫溶接を施し
た後、電縫溶接部を加熱して熱処理を施して電縫溶接鋼
管とする。The steel material having a structure containing island-like martensite in an area fraction of 5% or more in the base structure of ferrite or bainite is subjected to electric resistance welding, and then the electric resistance welded portion is heated. And heat-treated to obtain ERW welded steel pipe.
【００３０】電縫溶接鋼管の造管、電縫溶接は常用され
る方法によることができる。また、電縫溶接部の熱処理
は常用される熱処理装置を用いて、１０００〜１１５０
℃の温度に加熱して熱処理をする必要がある。加熱温度
が１０００℃未満では溶接部の硬度が低く、母材と同等
の耐摩耗性を確保できない。また、１１５０℃を超える
と溶接部の靱性が低下する。ERW Welding Steelmaking and ERW welding can be carried out by a commonly used method. In addition, the heat treatment of the electric resistance welded portion is performed by using a heat treatment device that is commonly used, and is 1000 to 1150.
It is necessary to heat to a temperature of ℃. If the heating temperature is less than 1000 ° C, the hardness of the welded portion is low and it is not possible to secure the same wear resistance as the base metal. On the other hand, if the temperature exceeds 1150 ° C, the toughness of the welded portion will decrease.
【００３１】本発明によって製造された電縫溶接鋼管
は、母材がフェライトまたはベイナイトからなる地組織
中に面積分率で５％以上の島状のマルテンサイトを含む
組織からなっているので、耐摩耗性、加工性に優れる。
また、溶接部の硬度は母材と同等であり、さらに靱性は
母材と同等以上である。熱処理後の電縫鋼管を耐摩耗用
途に使用した場合、鋼管全体として優れた耐摩耗性を発
揮することができる。The electric resistance welded steel pipe produced according to the present invention has a structure in which the base material is composed of ferrite or bainite and contains island-like martensite in an area fraction of 5% or more. Excellent wear and workability.
Further, the hardness of the welded portion is equivalent to that of the base material, and the toughness is equal to or higher than that of the base material. When the electric resistance welded steel pipe after heat treatment is used for wear resistance, excellent wear resistance can be exhibited as a whole steel pipe.
【００３２】[0032]
【実施例】表１の組成の厚さ１２ｍｍの鋼材を熱処理し
てフェライトまたはベイナイトの地組織中に面積分率で
１１〜２４％の島状マルテンサイトが分散した組織の鋼
材を準備した。この鋼材を用いて溶接速度１０．０ｍ／
分、入力１７５ｋｗの条件で電縫溶接をして電縫鋼管を
製造した。この電縫管の溶接部を誘導加熱による熱処理
シュミレーターにより、急速加熱によって熱処理温度ま
で加熱した後、引続き空冷相当の冷却速度で冷却して電
縫鋼管を得た。この電縫鋼管の熱処理後の母材、溶接部
の硬度、靱性を調査した。硬度はＨｖ（荷重５００ｇ）
により測定した。また、靱性はシャルピー試験により、
０℃におけるシャルピー吸収エネルギーを調査した。熱
処理条件、調査結果を表２、表３に示す。Example A steel material having a composition of Table 1 and having a thickness of 12 mm was heat-treated to prepare a steel material having a structure in which island-like martensite having an area fraction of 11 to 24% was dispersed in a ground structure of ferrite or bainite. Welding speed 10.0m / using this steel
Min., Electric resistance welding was performed under the condition of an input of 175 kw to manufacture an electric resistance welded steel pipe. The welded portion of this electric resistance welded pipe was heated to a heat treatment temperature by rapid heating by a heat treatment simulator using induction heating, and subsequently cooled at a cooling rate equivalent to air cooling to obtain an electric resistance welded steel pipe. The hardness and toughness of the base material and welded portion of this electric resistance welded steel pipe after heat treatment were investigated. Hardness is Hv (load 500g)
Was measured by In addition, the toughness is determined by the Charpy test.
The Charpy absorbed energy at 0 ° C. was investigated. The heat treatment conditions and the investigation results are shown in Tables 2 and 3.
【００３３】本発明例については溶接部の硬度が母材と
同等であり、また吸収エネルギー値は母材より幾分優れ
る。一方、比較例については硬度が母材と比較して著し
く劣化していたり、吸収エネルギー値が低い。In the examples of the present invention, the hardness of the welded portion is equivalent to that of the base material, and the absorbed energy value is somewhat superior to that of the base material. On the other hand, in the comparative example, the hardness is remarkably deteriorated as compared with the base material, and the absorbed energy value is low.
【００３４】[0034]
【表３】 [Table 3]
【００３５】[0035]
【発明の効果】本発明によれば、電縫溶接部の硬度が母
材と同等であり、また靱性が母材と同等以上であり、耐
摩耗性に優れた電縫鋼管を安価に製造することができ
る。According to the present invention, the hardness of the electric resistance welded portion is equal to that of the base material, the toughness is equal to or higher than that of the base material, and the electric resistance welded steel pipe excellent in wear resistance is manufactured at low cost. be able to.
【図面の簡単な説明】[Brief description of drawings]
【図１】熱処理後の電縫溶接部の加熱温度と硬度、靱性
との関係を示す図。FIG. 1 is a diagram showing a relationship between a heating temperature of an electric resistance welded portion after heat treatment and hardness and toughness.
【図２】鋼の硬さおよび島状マルテンサイト量が耐摩耗
性能に及ぼす影響について示す図。FIG. 2 is a diagram showing influences of hardness of steel and an amount of island martensite on wear resistance performance.
【図３】島状マルテンサイト量が耐摩耗性能に及ぼす影
響について示す図。FIG. 3 is a diagram showing the effect of the amount of island martensite on wear resistance performance.
Claims (2)
Ｓｉ：０．５０〜２．００％、Ｍｎ：０．５０〜２．５
０％を含有し、フェライトまたはベイナイトからなる地
組織中に面積分率で５％以上の島状マルテンサイトを分
散した組織の鋼材を用いて電縫溶接後、引続き電縫溶接
部を１０００〜１１５０℃の温度に加熱して熱処理する
ことを特徴とする耐摩耗性に優れた電縫鋼管の製造方
法。1. C: 0.05 to 0.20% in wt%,
Si: 0.50 to 2.00%, Mn: 0.50 to 2.5
After the electric resistance welding using a steel material containing 0% and having a structure in which island-like martensite having an area fraction of 5% or more is dispersed in a base structure composed of ferrite or bainite, the electric resistance welded portion is continuously 1000 to 1150. A method for producing an electric resistance welded steel pipe having excellent wear resistance, which comprises heating to a temperature of ℃ and heat treatment.
Ｓｉ：０．５０〜２．００％、Ｍｎ：０．５０〜２．５
０％、さらにＣｕ：０．０５〜１．００％、Ｎｉ：０．
０５〜２．００％、Ｃｒ：０．０５〜０．５％、Ｍｏ：
０．０５〜０．５％、Ｎｂ：０．００５〜０．１０％、
Ｖ：０．００５〜０．１０％、Ｔｉ：０．００５〜０．
１０％、Ｂ：３〜２０ｐｐｍの内から選ばれた一種以上
を含有し、フェライトまたはベイナイトからなる地組織
中に面積分率で５％以上の島状マルテンサイトを分散し
た組織の鋼材を用いて電縫溶接後、引続き電縫溶接部を
１０００〜１１５０℃の温度に加熱して熱処理すること
を特徴とする耐摩耗性に優れた電縫鋼管の製造方法。2. C: 0.05 to 0.20% by weight,
Si: 0.50 to 2.00%, Mn: 0.50 to 2.5
0%, Cu: 0.05 to 1.00%, Ni: 0.
05-2.00%, Cr: 0.05-0.5%, Mo:
0.05-0.5%, Nb: 0.005-0.10%,
V: 0.005 to 0.10%, Ti: 0.005 to 0.
10%, B: using a steel material containing at least one selected from 3 to 20 ppm and having a structure in which island-like martensite having an area fraction of 5% or more is dispersed in a ground structure made of ferrite or bainite After the electric resistance welding, the electric resistance welded portion is subsequently heated to a temperature of 1000 to 1150 [deg.] C. to be heat-treated, which is a method for producing an electric resistance welded steel pipe having excellent wear resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04295895A JP3228051B2 (en) | 1995-03-02 | 1995-03-02 | Manufacturing method of ERW steel pipe with excellent wear resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04295895A JP3228051B2 (en) | 1995-03-02 | 1995-03-02 | Manufacturing method of ERW steel pipe with excellent wear resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08239732A true JPH08239732A (en) | 1996-09-17 |
| JP3228051B2 JP3228051B2 (en) | 2001-11-12 |
Family
ID=12650544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04295895A Expired - Fee Related JP3228051B2 (en) | 1995-03-02 | 1995-03-02 | Manufacturing method of ERW steel pipe with excellent wear resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3228051B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009014238A1 (en) * | 2007-07-23 | 2009-01-29 | Nippon Steel Corporation | Steel pipes excellent in deformation characteristics and process for manufacturing the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102421943B1 (en) * | 2020-12-03 | 2022-07-15 | 장진호 | Pushing device for discharge valve of hand sanitizer container |
-
1995
- 1995-03-02 JP JP04295895A patent/JP3228051B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009014238A1 (en) * | 2007-07-23 | 2009-01-29 | Nippon Steel Corporation | Steel pipes excellent in deformation characteristics and process for manufacturing the same |
| JP4528356B2 (en) * | 2007-07-23 | 2010-08-18 | 新日本製鐵株式会社 | Steel pipe with excellent deformation characteristics |
| JP2010196173A (en) * | 2007-07-23 | 2010-09-09 | Nippon Steel Corp | Steel pipe excellent in deformation characteristics |
| JP2010209471A (en) * | 2007-07-23 | 2010-09-24 | Nippon Steel Corp | Steel pipe superior in deformation properties, and method for manufacturing the same |
| JPWO2009014238A1 (en) * | 2007-07-23 | 2010-10-07 | 新日本製鐵株式会社 | Steel pipe with excellent deformation characteristics |
| JP4575996B2 (en) * | 2007-07-23 | 2010-11-04 | 新日本製鐵株式会社 | Steel pipe with excellent deformation characteristics and method for producing the same |
| JP4575995B2 (en) * | 2007-07-23 | 2010-11-04 | 新日本製鐵株式会社 | Steel pipe with excellent deformation characteristics |
| US8920583B2 (en) | 2007-07-23 | 2014-12-30 | Nippon Steel & Sumitomo Metal Corporation | Steel pipe excellent in deformation characteristics and method of producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3228051B2 (en) | 2001-11-12 |
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