EP1705260B1 - Steel - Google Patents

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Publication number
EP1705260B1
EP1705260B1 EP04775251A EP04775251A EP1705260B1 EP 1705260 B1 EP1705260 B1 EP 1705260B1 EP 04775251 A EP04775251 A EP 04775251A EP 04775251 A EP04775251 A EP 04775251A EP 1705260 B1 EP1705260 B1 EP 1705260B1
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EP
European Patent Office
Prior art keywords
steel
nickel
manganese
molybdenum
phosphorus
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Not-in-force
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EP04775251A
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German (de)
French (fr)
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EP1705260A1 (en
EP1705260A4 (en
Inventor
Sergey Vladimirovich Golovin
Sergey Vladimirovich Goshkadera
Alexey Vladimirovich Dub
Vladimir Semenovich Dub
Alexandr Sergeevich Loboda
Sergey Ivanovich Markov
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Kilkenny Industries Sa (bvi)
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Kilkenny Industries Sa (bvi)
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Publication of EP1705260A4 publication Critical patent/EP1705260A4/en
Application granted granted Critical
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Classifications

    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Definitions

  • steel can be used for the production of oil pipelines, natural gas pipelines, product pipelines, offshore platforms, welded structures and containers which can operate under pressure, different equipment and its component parts operating in temperatures from - 100°C to +450°C.
  • This steel has all properties required for the production of oil pipelines, natural gas pipelines, product pipelines and other welded structures which can operate in temperatures from -100°C to +450°C.
  • such steel has strength properties which are insufficient for the manufacture of the above and other products made of steel sheets above 20 mm thick. This drawback can be eliminated by way of increasing hardening characteristics through higher content of alloying agents; nevertheless such steel may demonstrate brittle behavior.
  • This invention is aimed at improvement of steel strength properties.
  • the result of this invention is as follows: sheets and billets up to 50 mm thick with the following properties: yield stress above 550 N/mm 2 , breaking strength above 620 N/mm 2 ; preserving high ductility in temperatures down to -100°C, resistance to brittle behavior during manufacture and operation, good weldability in factory and field environment.
  • the steel containing carbon, manganese, silicium, chrome, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, stibium, stannum, arsenic and iron additionally includes molybdenum, with the following component ratio (weight, %): Carbon 0.02-0.11 Manganese 0.10-1.8 Silicium 0.06-0.6 Chrome 0.005-0.30 Nickel 0.005-1.0 Vanadium 0.01-0.12 Niobium 0.02-0.1 Titanium 0.01-0.04 Aluminium 0.01-0.05 Calcium 0.0005-0.008 Sulphur 0.0005-0.008 Phosphorus 0.001-0.012 Nitrogen 0.001-0.012 Copper 0.005-0.25 Stibium 0.0001-0.005 Stannum 0.0001-0.007 Arsenic 0.0001-0.008 Molybdenum 0.0001-0.5 Iron remaining share
  • total content of nickel and manganese is related to molybdenum and phosphorus content (weight. %) according to the following equation: Ni + Mn 1 + Mo ⁇ P ⁇ 0.03
  • the above mentioned nickel, manganese, molybdenum and phosphorus limits in steel supported by the enumerated ration of components provide both improved hardening characteristics for steel sheets up to 50 mm thick, high values of strength and ductility in low temperatures (down to -100°C) and elimination of embrittlement in the process of manufacture and use of products made from these sheets.
  • Table 1 shows the chemical composition of three heats of this steel in comparison with a known composition of steel. Compositions have been selected in such a way so as to estimate molybdenum and nickel contribution to steel sheet strength.
  • Furnace charge consisted of armco iron and, depending on variant of composition, of nickel, ferromolybdenum, copper and other charge materials.
  • charge meltdown was started. After complete meltdown and metal heating up to 1630-1650°C the charge was degasified and the required predetermined amounts of manganese, ferrovanadium and ferroniobium were added to the molten pool; then deoxidizing agents (ferrosilicium, aluminium and ferrotitanium) were added.
  • Table 2 shows the properties of these heats in comparison with heats of a known composition whose C eq is equal to 0.37.
  • the obtained results demonstrate that the new steel of the above composition possesses the required strength properties in 50-mm cross-sections and high ductility in low temperatures.
  • the ratio between the total content of nickel and manganese and the concentration of molybdenum and phosphorus for heats 1, 2 and 3 is 0.01, 0.0057 and 0.0064, respectively, i.e. less than 0.03.
  • Table 1 Chemical composition of three heats of the proposed steel in comparison with a known composition of steel.

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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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Earth Drilling (AREA)
  • Lubricants (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Materials For Medical Uses (AREA)

Abstract

This is an invention in metallurgy, referring specifically to steel with high ductility in subzero temperatures, good weldability, resistance to brittle behavior and corrosion, heat-resistance in high temperatures. Such steel can be used for the production of oil pipelines, natural gas pipelines, product pipelines, offshore platforms, welded structures and containers which can operate under pressure, different equipment and its component parts operating in temperatures from - 100°C to +450°C. The steel containing carbon, manganese, silicium, chrome, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, stibium, stannum, arsenic and iron additionally includes molybdenum, with the following component ratio (weight, %): This being the case, total content of nickel and manganese is related to molybdenum and phosphorus content (weight. %) according to the following equation: Ni + Mn 1 + Mo ‹ P Œ© 0.03

Description

    TECHNICAL FIELD
  • This is an invention in metallurgy, referring specifically to steel with high ductility in subzero temperatures, good weldability, resistance to brittle behavior and corrosion, heat-resistance in high temperatures. Such steel can be used for the production of oil pipelines, natural gas pipelines, product pipelines, offshore platforms, welded structures and containers which can operate under pressure, different equipment and its component parts operating in temperatures from - 100°C to +450°C.
    • BACKGROUND ART
  • There is steel having the following component ratio (weight, %):
    Carbon 0.03 - 0.11
    Manganese 0.9-1.8
    Silicium 0.06-0.6
    Chrome 0.005-0.30
    Nickel 0.005-0.3
    Vanadium 0.02-0.12
    Niobium 0.03-0.1
    Titanium 0.01-0.04
    Aluminium 0.01-0.055
    Calcium 0.001-0.005
    Sulphur 0.0005-0.008
    Phosphorus 0.0005-0.010
    Nitrogen 0.001-0.012
    Copper 0.005-0.25
    Stibium 0.001-0.005
    Stannum 0.001-0.007
    Arsenic 0.001-0.008
    Iron remaining share
    (Patent of the Russian Federation No. 2141002 , publication date 10.11.1999).
  • This steel has all properties required for the production of oil pipelines, natural gas pipelines, product pipelines and other welded structures which can operate in temperatures from -100°C to +450°C. However, such steel has strength properties which are insufficient for the manufacture of the above and other products made of steel sheets above 20 mm thick. This drawback can be eliminated by way of increasing hardening characteristics through higher content of alloying agents; nevertheless such steel may demonstrate brittle behavior.
    • DISCLOSURE OF THE INVENTION
  • This invention is aimed at improvement of steel strength properties. The result of this invention is as follows: sheets and billets up to 50 mm thick with the following properties: yield stress above 550 N/mm2, breaking strength above 620 N/mm2; preserving high ductility in temperatures down to -100°C, resistance to brittle behavior during manufacture and operation, good weldability in factory and field environment.
  • Technically, the required result is obtained due to the fact that the steel containing carbon, manganese, silicium, chrome, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, stibium, stannum, arsenic and iron additionally includes molybdenum, with the following component ratio (weight, %):
    Carbon 0.02-0.11
    Manganese 0.10-1.8
    Silicium 0.06-0.6
    Chrome 0.005-0.30
    Nickel 0.005-1.0
    Vanadium 0.01-0.12
    Niobium 0.02-0.1
    Titanium 0.01-0.04
    Aluminium 0.01-0.05
    Calcium 0.0005-0.008
    Sulphur 0.0005-0.008
    Phosphorus 0.001-0.012
    Nitrogen 0.001-0.012
    Copper 0.005-0.25
    Stibium 0.0001-0.005
    Stannum 0.0001-0.007
    Arsenic 0.0001-0.008
    Molybdenum 0.0001-0.5
    Iron remaining share
  • This being the case, total content of nickel and manganese is related to molybdenum and phosphorus content (weight. %) according to the following equation: Ni + Mn 1 + Mo ⋅ P < 0.03
    Figure imgb0001
  • The above mentioned nickel, manganese, molybdenum and phosphorus limits in steel supported by the enumerated ration of components provide both improved hardening characteristics for steel sheets up to 50 mm thick, high values of strength and ductility in low temperatures (down to -100°C) and elimination of embrittlement in the process of manufacture and use of products made from these sheets.
    • THE BEST MODE FOR CARRYING OUT THE INVENTION
  • Table 1 shows the chemical composition of three heats of this steel in comparison with a known composition of steel. Compositions have been selected in such a way so as to estimate molybdenum and nickel contribution to steel sheet strength.
  • All heats have been performed in a vacuum induction furnace. Furnace charge consisted of armco iron and, depending on variant of composition, of nickel, ferromolybdenum, copper and other charge materials. When the required underpressure in the furnace was achieved charge meltdown was started. After complete meltdown and metal heating up to 1630-1650°C the charge was degasified and the required predetermined amounts of manganese, ferrovanadium and ferroniobium were added to the molten pool; then deoxidizing agents (ferrosilicium, aluminium and ferrotitanium) were added.
  • As the temperature of liquid steel reached the required level (1560-1580°C) the airfree metal was run off directly from the smelting crucible to the casting mold. Molded ingots were then cooled in casting molds under normal pressure, not in vacuum.
  • On the whole, 12 trial heats have been performed in the vacuum induction furnace. Analysis of metal chemical composition has been performed for all heats and, on the basis of its results, three heats were selected with equivalent carbon content equal to 0.37.
  • The equivalent carbon content was determined by the following formula: C eq = C + Mn 6 + Cr + Mo + Nb + V + Ti 5 + Ni + Cu 15
    Figure imgb0002
  • Table 2 shows the properties of these heats in comparison with heats of a known composition whose Ceq is equal to 0.37. The obtained results demonstrate that the new steel of the above composition possesses the required strength properties in 50-mm cross-sections and high ductility in low temperatures. The ratio between the total content of nickel and manganese and the concentration of molybdenum and phosphorus for heats 1, 2 and 3 is 0.01, 0.0057 and 0.0064, respectively, i.e. less than 0.03. Table 1. Chemical composition of three heats of the proposed steel in comparison with a known composition of steel.
    Component Content (weight,%)
    Heat 1 Heat 2 Heat 3 Heat of known steel
    carbon 0.02 0.04 0.09 0.06
    manganese 1.5 1.0 0.3 1.4
    silicium 0.1 0.18 0.25 0.25
    chrome 0.05 0.28 0.2 0.15
    nickel 0.5 0.1 0.9 0.1
    vanadium 0.1 0.05 0.01 0.07
    niobium 0.032 0.06 0.087 0.06
    titanium 0.01 0.015 0.035 0.015
    aluminium 0.012 0.021 0.028 0.024
    calcium 0.0005 0.003 0.006 0.005
    sulphur 0.0035 0.004 0.008 0.003
    phosphorus 0.005 0.007 0.008 0.005
    nitrogen 0.005 0.006 0.007 0.007
    copper 0.23 0.1 0.01 0.15
    stibium 0.0003 0.0009 0.004 0.005
    stannum 0.0005 0.005 0.007 0.005
    arsenic 0.0002 0.004 0.008 0.008
    molybdenum 0.0001 0.35 0.5 -
    equivalent carbon content 0.37 0.37 0.37 0.37
    N ⁢ i + M ⁢ n 1 + M ⁢ o ⋅ P
    Figure imgb0003
         		0.01 0.0057 0.0064 -
    Table 2. Properties of the heats of Table 1.
    Heat Cross section, mm Breaking strength, N/mm2 Yield stress, N/mm2 Ductile-brittle transition point, °C
    1 20/50 836/687 706/583 -90/-100
    2 20/50 807/712 683/600 -90/-100
    3 20/50 767/657 650/566 -90/-100
    Heat of known steel 20/50 621/528 528/449 -80/-30

Claims (1)

  1. Steel, containing carbon; manganese, silicium; chrome, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, stibium, stannum, arsenic and iron. Its distinctive feature is additional content of molybdenum, with the following component ratio (weight, %): Carbon 0.02-0.11 Manganese 0.10-1.8 Silicium 0.06-0.6 Chrome 0.005 - 0.30 Nickel 0.005-1.0 Vanadium 0.01-0.12 Niobium 0.02-0.1 Titanium 0.01-0.04 Aluminium 0.01-0.05 Calcium 0.0005-0.008 Sulphur 0.0005-0.008 Phosphorus 0.001-0.012 Nitrogen 0.001-0.012 Copper 0.005-0.25 Stibium 0.0001-0.005 Stannum 0.0001-0.007 Arsenic 0.0001-0.008 Molybdenum 0.0001-0.5 Iron remaining share,
    this being the case, total content of nickel and manganese is related to molybdenum and phosphorus content (weight. %) according to the following equation: Ni + Mn 1 + Mo ⋅ P < 0.03
    Figure imgb0004
EP04775251A 2003-12-30 2004-08-06 Steel Not-in-force EP1705260B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2003137757/02A RU2241780C1 (en) 2003-12-30 2003-12-30 Steel
PCT/RU2004/000307 WO2005064032A1 (en) 2003-12-30 2004-08-06 Steel

Publications (3)

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EP1705260A1 EP1705260A1 (en) 2006-09-27
EP1705260A4 EP1705260A4 (en) 2008-08-13
EP1705260B1 true EP1705260B1 (en) 2010-07-07

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EP (1) EP1705260B1 (en)
JP (1) JP2007517139A (en)
KR (1) KR20070008543A (en)
CN (1) CN100513622C (en)
AT (1) ATE473310T1 (en)
DE (1) DE602004028045D1 (en)
RU (1) RU2241780C1 (en)
UA (2) UA78268C2 (en)
WO (1) WO2005064032A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2252972C1 (en) 2004-06-07 2005-05-27 Закрытое акционерное общество Научно-производственное объединение "ПОЛИМЕТАЛЛ" Pipe for gas- and product pipelines and a method of its production
CN101538679B (en) * 2009-04-17 2010-09-29 钢铁研究总院 Microalloyed easy welding nitrogen-increasing steel with
CN102206787B (en) * 2011-04-28 2014-06-11 广东省韶关钢铁集团有限公司 Low-roll-force gas-transmission pipeline steel and production method thereof
CN102181807B (en) * 2011-05-09 2012-12-12 武汉钢铁(集团)公司 Steel for nuclear power pressure equipment at temperature of -50 DEG C and manufacturing method thereof
CN103352179B (en) * 2013-06-24 2015-12-02 浙江浦宁不锈钢有限公司 A kind of phosphorus-containing alloy
CN104789885A (en) * 2015-04-23 2015-07-22 苏州劲元油压机械有限公司 Corrosion-resistant stainless steel oil delivery pipe and processing technology thereof
CN106868422A (en) * 2015-12-14 2017-06-20 泸州沱江液压件有限公司 A kind of high-strength material steel of Low temperature-resistancorrosion-resistant corrosion-resistant
CN107236909B (en) * 2017-06-16 2019-06-18 武汉钢铁有限公司 It can be used for the high intensity, high tenacity corrosion resistant steel and its production method of -60 DEG C of low temperature environments
CN107626546A (en) * 2017-09-26 2018-01-26 烟台史密得机电设备制造有限公司 A kind of electrostatic spraying hardening cooling device
CN113817965A (en) * 2021-09-02 2021-12-21 江苏伟建工具科技有限公司 High-toughness high-speed steel and preparation method thereof

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JPS5431019A (en) * 1977-08-12 1979-03-07 Kawasaki Steel Co Steel material having good resistance to hydrogenninduceddcracking
JPS589926A (en) * 1981-07-09 1983-01-20 Kawasaki Steel Corp Production of api standard class x80 steel pipe of superior low temperature toughness
US5545269A (en) * 1994-12-06 1996-08-13 Exxon Research And Engineering Company Method for producing ultra high strength, secondary hardening steels with superior toughness and weldability
RU2136776C1 (en) * 1995-02-03 1999-09-10 Ниппон Стил Корпорейшн High-strength steel for main pipelines with low yield factor and high low-temperature ductility
EP1017862B1 (en) * 1997-07-28 2006-11-29 Exxonmobil Upstream Research Company Method for producing ultra-high strength, weldable steels with superior toughness
RU2141002C1 (en) * 1999-02-15 1999-11-10 Открытое акционерное общество "Акционерная компания "Транснефть" Steel
JP2001064749A (en) * 1999-08-27 2001-03-13 Kawasaki Steel Corp Hic-resisting non-heat treated high tensile strength steel product excellent in toughness in weld heat-affected zone
JP4071906B2 (en) * 1999-11-24 2008-04-02 新日本製鐵株式会社 Manufacturing method of steel pipe for high tension line pipe with excellent low temperature toughness
RU2180691C1 (en) * 2000-09-04 2002-03-20 Акционерное общество закрытого типа Научно-производственное объединение "Полиметалл" Pipe for gas and oil product lines and method of its manufacture

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Publication number Publication date
WO2005064032A8 (en) 2006-11-02
UA8385U (en) 2005-08-15
JP2007517139A (en) 2007-06-28
ATE473310T1 (en) 2010-07-15
UA78268C2 (en) 2007-03-15
WO2005064032A1 (en) 2005-07-14
CN1926257A (en) 2007-03-07
CN100513622C (en) 2009-07-15
EP1705260A1 (en) 2006-09-27
KR20070008543A (en) 2007-01-17
DE602004028045D1 (en) 2010-08-19
RU2241780C1 (en) 2004-12-10
EP1705260A4 (en) 2008-08-13

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