US20020150497A1 - Use of alloy steel for making high-strength, seamless steel tubes - Google Patents

Use of alloy steel for making high-strength, seamless steel tubes Download PDF

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Publication number
US20020150497A1
US20020150497A1 US10/085,488 US8548802A US2002150497A1 US 20020150497 A1 US20020150497 A1 US 20020150497A1 US 8548802 A US8548802 A US 8548802A US 2002150497 A1 US2002150497 A1 US 2002150497A1
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US
United States
Prior art keywords
alloy steel
tubes
strength
less
steel
Prior art date
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Abandoned
Application number
US10/085,488
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English (en)
Inventor
Ingo Hagen
Kurt Niederhoff
Bernhard Koschlig
Markus Pardun
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Vallourec Deutschland GmbH
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V&M Deutschland GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by V&M Deutschland GmbH filed Critical V&M Deutschland GmbH
Assigned to V & M DEUTSCHLAND GMBH reassignment V & M DEUTSCHLAND GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOSCHLIG, BERNHARD, NIEDERHOFF, KURT, PARDUN, MARKUS, VON HAGEN, INGO
Publication of US20020150497A1 publication Critical patent/US20020150497A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies

Definitions

  • This steel is used for making tubes, in particular special section tubes, i.e. tubes of non-circular cross section, as well as tubular articles, wherein these products are subsequently subjected to a final quenching and tempering process.
  • the products are especially suitable for highly stressed welded components, such as steel constructions, e.g. bridge construction, ship construction, hoist construction and truck construction.
  • high-strength, weldable seamless steel tube denotes a structural tube having a tensile strength R m and a yield strength R p0.2 which, depending on wall thickness, reach at least the values given in the following Table 1: TABLE 1 Wall Thickness ⁇ 20 >20-40 >40-50 >50-65 >65-80 ⁇ 80-100 (mm) Tensile ⁇ 770 ⁇ 720 ⁇ 670 ⁇ 670 ⁇ 620 ⁇ 620 Strength R m (N/mm 2 ) Yield Strength ⁇ 690 ⁇ 650 ⁇ 615 ⁇ 580 ⁇ 540 ⁇ 500 R p0.2 (N/mm 2 )
  • the structural tubes should have an elongation A at break which should amount for longitudinal samples at least 16% and for transverse samples at least 14%.
  • such high-strength steel tubes should have a viscosity at least of values given in Table 2 for the notch impact work: TABLE 2 Notch Impact Work A V (J) at ⁇ 40° C. Wall Thickness Mean Value (mm) Longitudinal transverse ⁇ 20 40 27 >20-50 30 25 >50 27 —
  • an alloy steel includes 0.12 to 0.25 wt. % C, 0.40 wt. % or less Si, 1.20 to 1.80 wt. % Mn, 0.025 wt. % or less P, 0.010 wt. % or less S, 0.01 to 0.06 wt. % Al, 0.20 to 0.50 wt. % Cr, 0.20 to 0.50 wt. % Mo, 0.03 to 0.10 wt. % V, 0.20 wt. % or less Cu, 0.02 wt. % or less N, 0.30 to 1.00 wt. % W, and the balance iron and incidental impurities, for making high-strength, weldable seamless steel tubes for structural application, through a hot rolling process and subsequent quenching and tempering.
  • the content of tungsten is at least 0.5%.
  • the presence of Ni may not amount to more than 0.20 wt. %.
  • the Ni-content is kept to a maximum of 0.15 wt. %, in particular to a maximum of 0.10 wt. %.
  • Superior strength values can be established by limiting the content of C to 0.14 wt. %-0.20 wt. %, while still maintaining superior toughness of the finished product.
  • Structural tubes produced in accordance with the present invention exhibit superior strength in combination with superior toughness. At the same time, these tubes are easy to weld and exhibit defect-free surfaces during rolling. These results are essentially implemented through an alloy steel which contains tungsten while the content of nickel has been decreased at least to a level below a critical limit.
  • FIG. 1 is a graph showing the relation between a yield strength in N/mm 2 and a wall thickness in mm of exemplified alloy steels according to the invention
  • FIG. 2 is a graph showing the relation between a tensile strength in N/mm 2 and a wall thickness in mm of the alloy steels.
  • FIG. 3 is a graph showing the relation between an elongation at break in % and a wall thickness in mm of the alloy steels.
  • An exemplified alloy steel according to the present invention has a following composition, by weight percent. C 0.17% Si 0.32% Mn 1.50% P 0.01% S 0.001% Al 0.031% Cr 0.32% Mo 0.27% Cu 0.16% Ni 0.12% V 0.07% W 0.56% N 0.006%
  • the alloy steel is melted and cast to a source material of round cross section. Subsequently, the source material is rolled in a conventional manner in pilger-type rolling mill into tubes of different sizes. After a cooling to room temperature, the so-produced tubes are subjected to a conventional quenching and tempering process.
  • the tubes made from the alloy steel according to the present invention have a smooth surface which is absent of normally encountered distinct scabs, so that the tubes according to the present invention can be used as structural tubes, without any need for an additional aftertreatment.
  • the technological properties of the tubes were determined by testing transverse samples taken from the produced tubes.
  • samples were used which were taken from tubes with a diameter of 457 mm at a wall thickness of 20 mm, from tubes with a diameter of 404 mm at a wall thickness of 41 mm, and from tubes with a diameter of 404 mm at a wall thickness of 60 mm.
  • FIG. 1 there is shown a graph depicting the relation between a yield strength R p0.2 in N/mm 2 and the wall thickness in mm of these alloy steels.
  • the minimum yield strength for the conventional steel FGS 70 V is included as well by way of a stepped line. As can be seen from FIG. 1 by the dots, even the lowest measuring values are still far greater than the required minimum yield strength.
  • FIG. 2 shows in a like manner a graph depicting the relation between a tensile strength R m in N/mm 2 and the wall thickness in mm of these alloy steels, with the stepped line illustrating the minimum values for the steel FGS 70 V. Also here, the lowest values determined for the alloy steels according to the present invention are significantly greater than the required minimum values.
  • FIG. 3 shows a graph depicting the relation between an elongation A 5 at break in % and the wall thickness in mm of the transverse samples of the above alloy steels. Again, the lowest values are still significantly greater than the minimum value of 14%.
  • the structural tubes being produced exhibit superior strength in combination with superior toughness. At the same time, these tubes are easy to weld and exhibit defect-free surfaces already in rolled condition.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US10/085,488 1999-08-30 2002-02-28 Use of alloy steel for making high-strength, seamless steel tubes Abandoned US20020150497A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19942641.4 1999-08-30
DE19942641A DE19942641A1 (de) 1999-08-30 1999-08-30 Verwendung einer Stahllegierung zur Herstellung hochfester nahtloser Stahlrohre
PCT/DE2000/002787 WO2001016391A2 (de) 1999-08-30 2000-08-14 Verwendung einer stahllegierung zur herstellung hochfester nahtloser stahlrohre

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/002787 Continuation WO2001016391A2 (de) 1999-08-30 2000-08-14 Verwendung einer stahllegierung zur herstellung hochfester nahtloser stahlrohre

Publications (1)

Publication Number Publication Date
US20020150497A1 true US20020150497A1 (en) 2002-10-17

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US10/085,488 Abandoned US20020150497A1 (en) 1999-08-30 2002-02-28 Use of alloy steel for making high-strength, seamless steel tubes

Country Status (6)

Country Link
US (1) US20020150497A1 (de)
EP (1) EP1218559B1 (de)
DE (2) DE19942641A1 (de)
ES (1) ES2199865T3 (de)
MX (1) MXPA02001916A (de)
WO (1) WO2001016391A2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2939449A1 (fr) * 2008-12-09 2010-06-11 Vallourec Mannesmann Oil & Gas Acier faiblement allie a limite d'elasticite elevee et haute resistance a la fissuration sous contrainte par les sulfures.
US20110315277A1 (en) * 2008-02-20 2011-12-29 V & M Deutschland Gmbh Steel alloy for a low-alloy steel for producing high-strength seamless steel tubing
US8317946B2 (en) 2008-11-26 2012-11-27 Sumitomo Metal Industries, Ltd. Seamless steel pipe and method for manufacturing the same
EP3269837A1 (de) 2016-07-13 2018-01-17 Vallourec Deutschland GmbH Mikro-legierter stahl und verfahren zur herstellung dieses stahls

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005046459B4 (de) * 2005-09-21 2013-11-28 MHP Mannesmann Präzisrohr GmbH Verfahren zur Herstellung von kaltgefertigten Präzisionsstahlrohren
CN105986190A (zh) * 2015-02-25 2016-10-05 鞍钢股份有限公司 一种高强高韧性起重机臂架用管及其制造方法
CN105506464B (zh) * 2015-12-10 2017-12-12 北京太普国际管业有限公司 一种汽车轴用无缝钢管及制造方法
DE102016107141A1 (de) * 2016-04-18 2017-10-19 Benteler Steel/Tube Gmbh Kraftfahrzeuganhänger, Fahrwerkachse, insbesondere für einen Kraftfahrzeuganhänger und Verwendung der Fahrwerksachse und eines Werkstoffes
CN109097707A (zh) * 2018-09-07 2018-12-28 无锡华贝钢管制造有限公司 一种130ksi强度低温用臂架用无缝钢管以及制备工艺

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
GB1084231A (de) * 1900-01-01
JPS5161473A (en) * 1974-11-27 1976-05-28 Nippon Kokan Kk Kosokukonoritsugasushiirudoaakuyosetsunyoru atsunikuteionyokochoryokukokanno seizoho
JP2669220B2 (ja) * 1991-10-04 1997-10-27 住友金属工業株式会社 耐火性に優れたボルトおよびナット用鋼
US5454883A (en) * 1993-02-02 1995-10-03 Nippon Steel Corporation High toughness low yield ratio, high fatigue strength steel plate and process of producing same
DE4446709A1 (de) * 1994-12-15 1996-06-27 Mannesmann Ag Verwendung einer Stahllegierung für Konstruktions-Hohlprofile
FR2729974B1 (fr) * 1995-01-31 1997-02-28 Creusot Loire Acier a haute ductilite, procede de fabrication et utilisation
JPH09194998A (ja) * 1996-01-09 1997-07-29 Nkk Corp 溶接鋼管およびその製造方法
DE59704264D1 (de) * 1997-01-15 2001-09-13 Mannesmann Ag Verfahren zur herstellung nahtloser leitungsrohre mit stabiler streckgrenze bei erhöhten einsatztemperaturen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110315277A1 (en) * 2008-02-20 2011-12-29 V & M Deutschland Gmbh Steel alloy for a low-alloy steel for producing high-strength seamless steel tubing
US8865061B2 (en) * 2008-02-20 2014-10-21 Vallourec Deutschland Gmbh Steel alloy for a low-alloy steel for producing high-strength seamless steel tubing
KR101563604B1 (ko) 2008-02-20 2015-10-27 발루렉 도이칠란트 게엠베하 고장력 이음매 없는 강관을 생산하기 위한 저합금강용 강철 합금
US8317946B2 (en) 2008-11-26 2012-11-27 Sumitomo Metal Industries, Ltd. Seamless steel pipe and method for manufacturing the same
FR2939449A1 (fr) * 2008-12-09 2010-06-11 Vallourec Mannesmann Oil & Gas Acier faiblement allie a limite d'elasticite elevee et haute resistance a la fissuration sous contrainte par les sulfures.
WO2010066584A1 (en) * 2008-12-09 2010-06-17 Vallourec Mannesmann Oil & Gas France Low alloy steel with a high yield strength and high sulphide stress cracking resistance
EA020245B1 (ru) * 2008-12-09 2014-09-30 Валлурек Ойл Энд Гэс Франс Низколегированная сталь с высоким пределом текучести и высокой стойкостью к сульфидному растрескиванию под напряжением
US10640857B2 (en) 2008-12-09 2020-05-05 Vallourec Oil & Gas France Low alloy steel with a high yield strength and high sulphide stress cracking resistance
EP3269837A1 (de) 2016-07-13 2018-01-17 Vallourec Deutschland GmbH Mikro-legierter stahl und verfahren zur herstellung dieses stahls
WO2018011299A1 (en) 2016-07-13 2018-01-18 Vallourec Deutschland Gmbh Micro alloyed steel and method for producing said steel

Also Published As

Publication number Publication date
WO2001016391A3 (de) 2001-08-30
EP1218559A2 (de) 2002-07-03
DE19942641A1 (de) 2001-03-22
WO2001016391A2 (de) 2001-03-08
DE50002289D1 (de) 2003-06-26
MXPA02001916A (es) 2003-07-21
ES2199865T3 (es) 2004-03-01
EP1218559B1 (de) 2003-05-21

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AS Assignment

Owner name: V & M DEUTSCHLAND GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VON HAGEN, INGO;NIEDERHOFF, KURT;KOSCHLIG, BERNHARD;AND OTHERS;REEL/FRAME:012779/0684

Effective date: 20020226

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION