JPS5989717A - Manufacture of electric welded steel pipe with no difference in hardness between weld zone and base metal - Google Patents
Manufacture of electric welded steel pipe with no difference in hardness between weld zone and base metalInfo
- Publication number
- JPS5989717A JPS5989717A JP19674982A JP19674982A JPS5989717A JP S5989717 A JPS5989717 A JP S5989717A JP 19674982 A JP19674982 A JP 19674982A JP 19674982 A JP19674982 A JP 19674982A JP S5989717 A JPS5989717 A JP S5989717A
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- base metal
- difference
- steel pipe
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000010959 steel Substances 0.000 title claims abstract description 19
- 239000010953 base metal Substances 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000005098 hot rolling Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 abstract 2
- 229910052758 niobium Inorganic materials 0.000 abstract 1
- 238000000137 annealing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はボストアニールなしのままで溶接部と母材部の
硬度差をない電縫鋼管の製造方法に関するものであり、
その目的は電縫鋼管の拡管、押し広げ、曲げ等の加工性
低温靭性、耐サワー性、耐構食性の改善をはかるもので
ある。[Detailed Description of the Invention] The present invention relates to a method for manufacturing an electric resistance welded steel pipe without boss annealing and without hardness difference between the welded part and the base metal part,
The purpose is to improve the processability, low-temperature toughness, sour resistance, and structural corrosion resistance of ERW steel pipes during pipe expansion, stretching, bending, etc.
一般的に中径電縫鋼管は、電縫溶接後、誘導加熱により
ボストアニールされ、電縫溶接部と母材部の組織、硬度
の均一化が行なわれるのが普通である。一方、小径電縫
鋼管は、中径電縫鋼管のようにボストアニールすること
はなく、溶接のままで使用される場合が多い。この理由
は小径電縫管のボストアニールする技術が非常に困難で
あるためである。Generally, medium-diameter electric resistance welded steel pipes are subjected to boss annealing by induction heating after electric resistance welding, so that the structure and hardness of the electric resistance welded portion and the base metal portion are made uniform. On the other hand, small-diameter ERW steel pipes are not boss annealed like medium-diameter ERW steel pipes, and are often used as welded. The reason for this is that the technique for annealing the bottom of small diameter ERW pipes is extremely difficult.
特に小径の場合は中径とちがい、曲がりねじれが発生し
やすく、又誘導子と鋼管表面とのギャップ設定が離しい
ということがあり、小径電縫管のボストアニールは、現
状性なわれていないのが普通である。またボストアニー
ルすることにより曲がりが発生しやすく、できればボス
トアニールしなくてボストアニールの効果を出す必要が
あった。In particular, small diameter pipes are more prone to bending and twisting than medium diameter pipes, and the gap between the inductor and the steel pipe surface is set far apart, so boss annealing of small diameter ERW pipes is currently not possible. is normal. In addition, boss annealing tends to cause bending, so if possible, it is necessary to obtain the effect of boss annealing without using boss annealing.
本発明はこの要望に十分応える極めて有利な電縫鋼管の
製麺方法を提供するものであり、その要旨とするところ
は、Ｏ： ｏ、ｏｓ＊以下、Ｍｎ：０．９０％以下、Ｅ
ｌｉ ： ０．２０５６以下、及びＮｂ ：０−０６０
−以下、ｖ Ｓ ｏ、ｏａｓ以下、Ｔｔ ｔ Ｏ，０５
０％以下のうち、１種又は２種以上を含む残部が主とし
て鉄からなる鋼を、熱延仕上圧延終了後ランチウドテー
ブルで４０℃／ｓｅａ以上の急冷を行なうことを特徴と
する溶接部と母材部の硬度差のない電縫鋼管の製造方法
である。The present invention provides an extremely advantageous method for manufacturing electric resistance welded steel pipes that satisfactorily meets these demands.
li: 0.2056 or less, and Nb: 0-060
- Below, v So, oas below, Tt t O, 05
A welded part characterized in that a steel containing one or more of 0% or less, the remainder of which is mainly iron, is rapidly cooled at a temperature of 40°C/sea or more on a Lanciud table after finishing hot rolling. This is a method for manufacturing electric resistance welded steel pipes with no difference in hardness in the base material.
すなわち、本発明は電縫溶接部の急冷による硬化分を熱
延で素材を急冷することにより、母材と溶接部の均一化
を狙ったところがポイントであり、ボストアニールなし
で、ボストアニール後の溶接部と母材部の組織、硬度の
均一化を目標としたものである。In other words, the key point of the present invention is to use hot rolling to quickly cool the hardened portion of the ERW welded part, thereby making the base material and welded part uniform. The aim is to make the structure and hardness of the weld and base metal parts uniform.
以下本発明の構成要件について説明する。The constituent elements of the present invention will be explained below.
先ず素材の成分について述べると、ＯｌＭｎ。First, let's talk about the ingredients of the material: OlMn.
Ｓｌ は焼入硬化能力の強い元素であり、硬度差をで
きるだけ減少さすためにも、上限値の決定が必要であり
％ ’ ： ０−０５％以下、Ｍｎ ＠ ｏ、９ｏ ＊
以下、Ｅｌｉ ： ０．２０ ＊以下の上限値を実験に
て決定した。Sl is an element with strong quench hardening ability, and in order to reduce the hardness difference as much as possible, it is necessary to determine the upper limit.%': 0-05% or less, Mn @ o, 9 o *
Hereinafter, the upper limit value of Eli: 0.20 * or less was determined through experiments.
またｌｆｂ、 Ｖ、 Ｔｉは析出強化を主体にした元素
であり、ＯｌＭｎ、８１ はどきびしく制限する必要
はないが、溶接部と母材部の硬度差をある範囲に制限す
るには上限値が必要であり、Ｎｌ）：０．０６０％以下
、Ｖ ： ０．０６０％以下、Ｔ１ ： ０−０５０チ
以下に制限した。In addition, lfb, V, and Ti are elements that mainly promote precipitation strengthening, and there is no need to severely limit OlMn, 81, but an upper limit value is required to limit the hardness difference between the weld and the base metal within a certain range. Nl): 0.060% or less, V: 0.060% or less, and T1: 0-050% or less.
また強度保証の点から）Ｔｂ％Ｖ、Ｔｉを添加しなくて
も、また内１種または２種以上添加してもよい。Further, from the viewpoint of ensuring strength) Tb%V and Ti may not be added, or one or more of them may be added.
以−ヒの成分の鋼は転炉、平炉あるいは電気炉等のいず
れかにより溶製され、次いで造塊、分塊圧延あるいは連
続鋳造により鋼片、鋳片とされ、熱間圧延工程に送られ
る。Steel with the following components is melted in either a converter, open hearth, or electric furnace, and then made into slabs or slabs by ingot-forming, blooming, or continuous casting, and sent to a hot rolling process. .
熱間圧延工程では熱延仕上圧延終了後、ランナウトテー
ブルで４０℃／ｓｅａ以上の急冷を行なうことにより、
溶接部、母材部の硬度差を少なくするものである。In the hot rolling process, after finishing hot rolling, the product is rapidly cooled at a temperature of 40°C/sea or higher on a runout table.
This reduces the difference in hardness between the welded part and the base metal part.
第１図からもわかるようｌ二、急冷の効果は溶接部の硬
度差には影響を与えず、母材部のみを硬化することによ
り、母材部と溶接部の硬度差をなくすものである。これ
は従来の電縫溶接部の急冷による硬化分を、熱延で素材
を急冷することにより、母材と溶接部の均一化を狙った
ものであり、どちらも細粒化による強化機構である。As can be seen from Figure 1, the effect of quenching does not affect the hardness difference between the welded parts, and by hardening only the base metal, the difference in hardness between the base metal and the welded part is eliminated. . This aims to equalize the base material and weld by rapidly cooling the material by hot rolling to replace the hardening caused by the rapid cooling of conventional ERW welds, both of which are strengthening mechanisms through grain refinement. .
またこの強化は、高Ｏマルテンサイトのような靭性劣化
をまねくようなことはなく、母材部、溶接部の均一化は
もとより、延性、靭性も従来材に比べ°ｆぐれている。Furthermore, this strengthening does not cause the deterioration of toughness as with high O martensite, and not only does the base metal and welded parts become more uniform, but the ductility and toughness are also inferior to conventional materials.
次に本発明の実施例を表１に示す。Next, Table 1 shows examples of the present invention.
表 ■
ΔＨマ暖溶接部硬度−母材部硬変
以上の実施例に示すように、本発明によれば鋼管のシー
ム部のボストアニールを行なわなくても、また高価な管
体熱処理を行なわなくても、さらに特別高価な元素を添
加する必要もなく、溶接部と母材部の硬度差のない、延
性、靭性にすぐれた電縫＠管が製造でき、極めて有利な
ものである。Table ■ ∆H Warm Weld Hardness - Hardness of Base Metal As shown in the above examples, the present invention eliminates the need for boss annealing of the seam of steel pipes and the need for expensive pipe heat treatment. However, there is no need to add particularly expensive elements, and an electric resistance welded pipe with excellent ductility and toughness, with no difference in hardness between the welded part and the base metal part, can be produced, which is extremely advantageous.
第１図は熱延での冷却速度と溶接部、母材部の硬度差の
関係を調べた図表である。FIG. 1 is a chart examining the relationship between the cooling rate in hot rolling and the difference in hardness between the welded part and the base metal part.
Claims (1)
下、５１８０．２０％以下、及びＮｂ ｌ ０．０６０
１ｐ以下、ｖ；０．０６チ以下、Ｔｉ ： ０−０５０
９６以下のうち１種又は２種以上を含む残部が主として
鉄からなる鋼を熱延仕上圧延終了後、ランチウドテーブ
ルで４０℃／ｓｅａ以上の急冷を行なうことを特徴とす
る溶接部と母材部の硬度差のない電縫鋼管の製造方法。(]: 0.05ts or less, Mn: 0.90% or less, 5180.20% or less, and Nbl 0.060
1 p or less, v; 0.06 chi or less, Ti: 0-050
A welded part and base metal characterized in that a steel containing one or more of 96 or less, the remainder of which is mainly iron, is rapidly cooled at a temperature of 40°C/sea or higher on a Lanciud table after finishing hot rolling. A method for manufacturing ERW steel pipes with no difference in hardness between parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19674982A JPS5989717A (en) | 1982-11-11 | 1982-11-11 | Manufacture of electric welded steel pipe with no difference in hardness between weld zone and base metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19674982A JPS5989717A (en) | 1982-11-11 | 1982-11-11 | Manufacture of electric welded steel pipe with no difference in hardness between weld zone and base metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5989717A true JPS5989717A (en) | 1984-05-24 |
Family
ID=16362964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19674982A Pending JPS5989717A (en) | 1982-11-11 | 1982-11-11 | Manufacture of electric welded steel pipe with no difference in hardness between weld zone and base metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5989717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2582674A1 (en) * | 1985-05-28 | 1986-12-05 | Nippon Steel Corp | PROCESS FOR PRODUCING HIGH MECHANICAL RESISTANCE TUBE FOR ELECTRICALLY SOLDERED OIL WELLS |
-
1982
- 1982-11-11 JP JP19674982A patent/JPS5989717A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2582674A1 (en) * | 1985-05-28 | 1986-12-05 | Nippon Steel Corp | PROCESS FOR PRODUCING HIGH MECHANICAL RESISTANCE TUBE FOR ELECTRICALLY SOLDERED OIL WELLS |
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