JP2520454B2 - Manufacturing method of high strength ERW steel pipe - Google Patents
Manufacturing method of high strength ERW steel pipeInfo
- Publication number
- JP2520454B2 JP2520454B2 JP63184666A JP18466688A JP2520454B2 JP 2520454 B2 JP2520454 B2 JP 2520454B2 JP 63184666 A JP63184666 A JP 63184666A JP 18466688 A JP18466688 A JP 18466688A JP 2520454 B2 JP2520454 B2 JP 2520454B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- pipe
- manufacturing
- resistance welded
- electric 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、熱処理を施さない高強度電縫鋼管の製造方
法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing a high-strength electric resistance welded steel pipe that is not subjected to heat treatment.
［従来の技術］ 近年、鋼管の需要において、高強度電縫鋼管の要求が
強くなっている。また、高強度鋼管においては、安全性
の観点から延性も溶融されている。このような背景の中
で、鋼管を焼入・焼戻することにより、高強度電縫鋼管
を製造し、その要求に応えているのが現状である。しか
し、焼入・焼戻で高強度電縫鋼管を製造することは、次
のような不利益が生じている。[Prior Art] In recent years, the demand for high-strength electric resistance welded steel pipes has become stronger in the demand for steel pipes. Further, in a high strength steel pipe, ductility is also melted from the viewpoint of safety. Against this background, by quenching and tempering a steel pipe, a high-strength electric resistance welded steel pipe is manufactured, and the demand is met at present. However, manufacturing the high-strength electric resistance welded steel pipe by quenching and tempering has the following disadvantages.
（１）焼入・焼戻では、熱処理のコストがかかり、シー
ムレス鋼管に比べて安価であるという、電縫鋼管の利点
が発揮できない。また、大量のエネルギーを使用するこ
とになる。(1) Quenching / tempering requires the heat treatment cost and is less expensive than the seamless steel pipe, and the advantages of the electric resistance welded steel pipe cannot be exhibited. It also consumes a large amount of energy.
（２）電縫鋼管の利点である、寸法精度の良さを焼入時
に悪化させるため、矯正が必要となる。(2) Since the good dimensional accuracy, which is an advantage of ERW steel pipes, deteriorates during quenching, correction is necessary.
（３）制御圧延、制御冷却などの優れた技術によって製
造された熱間圧延材料の特性を利用できない。(3) The characteristics of the hot-rolled material produced by an excellent technique such as controlled rolling and controlled cooling cannot be utilized.
また、従来から、鋼管を強化する方法として冷間引き
抜きが広く行われているが、この方法では、次のような
不利益が生じている。Further, conventionally, cold drawing has been widely performed as a method for strengthening a steel pipe, but this method has the following disadvantages.
（１）冷間引き抜きでは、生産能率が低く、電縫鋼管の
利点である大量供給に対応できない。(1) With cold drawing, the production efficiency is low and it is not possible to cope with the large volume supply, which is an advantage of ERW steel pipes.
（２）冷間引き抜きでは、工程が増えることによりコス
トがかかり、シームレス鋼管に比べて安価であるという
電縫鋼管の利点が発揮できない。(2) In the cold drawing, the cost increases due to the increase in the number of steps, and the advantage of the electric resistance welded steel pipe that it is less expensive than the seamless steel pipe cannot be exhibited.
（３）冷間引き抜きでは、鋼の引張強さ、降伏強度は上
昇するものの、伸びが低下するので、近年の市場の要求
を満足できない。(3) In cold drawing, although the tensile strength and the yield strength of steel are increased, the elongation is decreased, so that the recent market demand cannot be satisfied.
以上のように電縫鋼管を焼入・焼戻する高強度電縫鋼
管の製造法や、冷間引き抜きによる、高強度電縫鋼管の
製造法では、本来電縫鋼管が持った利点を打ち消した形
で行われているのが欠点であった。As described above, in the method for manufacturing high-strength electric-resistance welded steel pipe that quenches and tempers electric-resistance welded steel pipe, and the method for manufacturing high-strength electric resistance welded steel pipe by cold drawing, the advantages originally possessed by electric resistance welded steel pipe were canceled. It was a drawback that it was done in shape.
従来技術としては、特開昭59-129723号公報に、サイ
ジングによるパイプの圧潰強度の向上に関する方法が示
されている。As a conventional technique, Japanese Patent Laid-Open No. 59-129723 discloses a method for improving the crush strength of a pipe by sizing.
［発明が解決しようとする課題］ 本発明は、上記の欠点を解消するために、従来の電縫
鋼管成形溶接後、焼入・焼戻あるいは、冷間引き抜きを
行わずに、高強度電縫鋼管を製造する方法を提供するも
のである。[Problems to be Solved by the Invention] In order to solve the above-mentioned drawbacks, the present invention provides high strength electric resistance welding without performing quenching / tempering or cold drawing after the conventional electric resistance welded steel pipe forming welding. A method for manufacturing a steel pipe is provided.
［課題を解決するための手段］ 本発明は、電縫管の製造において、継目溶接後の水冷
に引き続き管を全絞り率3.6〜80％でサイジングするこ
とにより、従来の管全体の焼入・焼戻、あるいは冷間引
き抜きを行うことによる不利益を、すべて解消する高強
度電縫鋼管の製造方法である。[Means for Solving the Problem] In the production of an electric resistance welded pipe, the present invention is a method for quenching the entire conventional pipe by sizing the pipe at a total draw ratio of 3.6 to 80% after water cooling after seam welding. This is a method for manufacturing a high-strength electric resistance welded steel pipe, which eliminates all the disadvantages caused by tempering or cold drawing.
本発明の電縫鋼管の製造方法では、熱処理工程の省略
により、コスト低減、省エネルギー化が図れる。また溶
接熱影響部以外は、熱延コイルの長所を持ったまま、製
管されるので、制御圧延、制御冷却によって細粒化され
た組織を持つ材料であれば、その優れた特性を十分発揮
でき、管焼入時寸法精度の悪化もない。また、冷間引き
抜きを施さないので、安価に大量供給できるうえ、鋼の
延性を低下させることもない。In the method for manufacturing an electric resistance welded steel pipe of the present invention, cost reduction and energy saving can be achieved by omitting the heat treatment step. Except for the weld heat affected zone, pipes are manufactured with the advantages of hot rolled coils, so if the material has a structure that has been fine-grained by controlled rolling and controlled cooling, its excellent characteristics will be fully demonstrated. It is possible and does not deteriorate the dimensional accuracy when quenching the pipe. Further, since cold drawing is not performed, a large amount of steel can be supplied at low cost and the ductility of steel is not deteriorated.
以下本発明の構成要件について説明する。 The constituent features of the present invention are described below.
電縫管の製造工程で、継目溶接後の水冷に引き続き管
を全絞り率3.6〜80％でサイジングすることによって歪
を導入し加工硬化をはかる。その結果、第１図に示すよ
うに、引張強さが上昇する。また、第２図に示すよう
に、降伏強度も上昇する。引張強さ、降伏強度は、共に
サイジングの全絞り率を大きくするほど上昇するので、
全絞り率を選ぶことによって、必要な分だけ強化を図れ
る長所がある。しかも、第３図に示すように、サイジン
グの全絞り率を大きくしても伸びの低下は小さいので、
十分な延性を有しており、市場の要求を満足できる。In the manufacturing process of ERW pipe, strain is introduced and work hardening is attempted by sizing the pipe at a total drawing ratio of 3.6 to 80% following water cooling after seam welding. As a result, the tensile strength increases as shown in FIG. Further, as shown in FIG. 2, the yield strength also increases. Both tensile strength and yield strength increase as the total drawing ratio of sizing increases.
By choosing the total drawing ratio, there is the advantage that it can be strengthened as much as necessary. Moreover, as shown in FIG. 3, even if the total drawing ratio of sizing is increased, the decrease in elongation is small, so
It has sufficient ductility and can meet the market demand.
全絞り率3.6％を下限としたのは、第１図、第２図に
示すように、3.6％未満では強化効果が明確には見られ
なかったためである。また、上限の80％は、全絞り率が
大きくなることにより、管にロール疵が発生し易くなる
ことを考慮して決められたものである。The reason why the total draw ratio was 3.6% was made the lower limit because, as shown in FIGS. 1 and 2, the strengthening effect was not clearly seen at less than 3.6%. The upper limit of 80% was determined in consideration of the fact that roll flaws are likely to occur in the pipe as the total draw ratio increases.
［実施例］ 第１表にパイプサイズ７″×0.362″のサンプル材を
用いて、試験を行った場合のその条件と結果を、本発明
と比較材に分けて示した。本発明材は、引張強さ、降伏
強度、ともに強化され、伸びも良好である。[Examples] Table 1 shows the conditions and results of the test when a sample having a pipe size of 7 "x 0.362" was used, divided into the present invention and the comparative material. The material of the present invention is reinforced in both tensile strength and yield strength and has good elongation.
［発明の効果］ 本発明によれば、管全体の焼入・焼戻材や冷間引き抜
き材と同等の強度が得られるので、焼入・焼戻や、冷間
引き抜きを行う必要が無い。従って、低コストで歩留良
く製造することができるものであり、本発明は、産業上
極めて有益である。 [Effects of the Invention] According to the present invention, since strength equivalent to that of a quenching / tempering material or a cold drawing material for the entire pipe can be obtained, it is not necessary to perform quenching / tempering or cold drawing. Therefore, the present invention can be manufactured at a low cost with a high yield, and the present invention is extremely useful industrially.
第１図は絞り率と引張強さの関係を示した図である。第
２図は絞り率と降伏強度の関係を示した図である。第３
図は絞り率と伸びの関係を示した図である。FIG. 1 is a diagram showing the relationship between drawing ratio and tensile strength. FIG. 2 is a diagram showing the relationship between the drawing ratio and the yield strength. Third
The figure shows the relationship between drawing ratio and elongation.
Claims (1)
に引き続き管を全絞り率3.6〜80％でサイジングするこ
とを特徴とする高強度電縫鋼管の製造方法。1. A method for producing a high-strength electric resistance welded steel pipe, characterized in that in the production of an electric resistance welded pipe, the pipe is sized at a total drawing ratio of 3.6 to 80% after water cooling after seam welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63184666A JP2520454B2 (en) | 1988-07-26 | 1988-07-26 | Manufacturing method of high strength ERW steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63184666A JP2520454B2 (en) | 1988-07-26 | 1988-07-26 | Manufacturing method of high strength ERW steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0234213A JPH0234213A (en) | 1990-02-05 |
| JP2520454B2 true JP2520454B2 (en) | 1996-07-31 |
Family
ID=16157232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63184666A Expired - Lifetime JP2520454B2 (en) | 1988-07-26 | 1988-07-26 | Manufacturing method of high strength ERW steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2520454B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921763A (en) * | 2012-12-05 | 2013-02-13 | 天津市大地工贸有限公司 | Seamless steel tube processing technology |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351519B (en) * | 2022-10-20 | 2023-08-22 | 江苏银环精密钢管有限公司 | Preparation method of inner cylinder for heat exchange unit of high-temperature gas cooled reactor evaporator |
-
1988
- 1988-07-26 JP JP63184666A patent/JP2520454B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921763A (en) * | 2012-12-05 | 2013-02-13 | 天津市大地工贸有限公司 | Seamless steel tube processing technology |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0234213A (en) | 1990-02-05 |
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