AR077129A1 - Metodo de fabricacion de un cano de acero y de una composicion de acero - Google Patents
Metodo de fabricacion de un cano de acero y de una composicion de aceroInfo
- Publication number
- AR077129A1 AR077129A1 ARP100102149A ARP100102149A AR077129A1 AR 077129 A1 AR077129 A1 AR 077129A1 AR P100102149 A ARP100102149 A AR P100102149A AR P100102149 A ARP100102149 A AR P100102149A AR 077129 A1 AR077129 A1 AR 077129A1
- Authority
- AR
- Argentina
- Prior art keywords
- weight
- steel composition
- less
- boron
- approximately
- Prior art date
Links
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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Composiciones de acero que contienen adiciones de microaleacion de boro y titanio, con una resistencia a la traccion de por lo menos 100 ksi (690 MPa), excelente rigidez y buena capacidad de soldadura. Las adiciones de boro son utilizadas para incrementar el endurecimiento. Es posible agregar formadores de nitruros fuertes, como titanio, a la composicion de acero en orden a impedir la formacion de nitruros de boro. Estas composiciones pueden ser enfriadas por laminado en caliente en aire o por aplicacion de un enfriamiento acelerado. Luego del enfriamiento en aire, la composicion puede ser apagada o apagada y templada. Las composiciones resultan adecuadas para canos de alta resistencia (por ejemplo, X100 en la norma API 5L) y otras aplicaciones. Reivindicacion 9: Un método de fabricacion de una composicion de acero, que comprende: proveer una composicion de acero que comprende: aproximadamente entre 0,04 y 0,12 % en peso de carbono (C); aproximadamente entre 0,8 y 1,6 % en peso de manganeso (Mn); aproximadamente entre 0,05 y 0,3 % en peso de silicio (Si); menos o hasta aproximadamente 0,5 % en peso de níquel (Ni); menos o hasta aproximadamente 0,5 % en peso de cromo (Cr); menos o hasta aproximadamente 0,5 % en peso de molibdeno (Mo); menos o hasta aproximadamente entre 0,15 % en peso de vanadio (V); menos o hasta aproximadamente entre 0,05 % en peso de niobio (Nb); aproximadamente entre 0,01 y 0,03 % en peso de titanio (Ti); aproximadamente entre 0,0005 y 0,0030 % en peso de boro (B); y menos o hasta 0,008 % en peso de nitrogeno (N); en tanto la concentracion de cada elemento se basa en el peso total de la composicion de acero y se mantienen aproximadamente entre 0,0005 y 0,002 % en peso de boro en solucion solida para mejorar la dureza; colar la composicion de acero, en tanto sustancialmente todo el nitrogeno en la composicion de acero colada está presente en forma de partículas de TiN con un tamano inferior a aproximadamente 50 nm para impedir la formacion de nitruros de boro y lograr dicho contenido de boro en solucion solida; laminar en caliente la composicion de acero colada; y enfriar la composicion de acero colada directamente luego del laminado en caliente a una velocidad que oscila aproximadamente entre 5 y 50°C/segundo.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/486,610 US20100319814A1 (en) | 2009-06-17 | 2009-06-17 | Bainitic steels with boron |
Publications (1)
Publication Number | Publication Date |
---|---|
AR077129A1 true AR077129A1 (es) | 2011-08-03 |
Family
ID=43086438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ARP100102149A AR077129A1 (es) | 2009-06-17 | 2010-06-17 | Metodo de fabricacion de un cano de acero y de una composicion de acero |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100319814A1 (es) |
EP (1) | EP2287346B1 (es) |
JP (1) | JP5787492B2 (es) |
AR (1) | AR077129A1 (es) |
BR (1) | BRPI1004267B1 (es) |
MX (1) | MX2010006761A (es) |
Families Citing this family (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004097059A1 (es) | 2003-04-25 | 2004-11-11 | Tubos De Acero De Mexico, S.A. | Tubo de acero sin costura para ser utilizado como canalizador y proceso de obtencíon del mismo |
MXPA05008339A (es) * | 2005-08-04 | 2007-02-05 | Tenaris Connections Ag | Acero de alta resistencia para tubos de acero soldables y sin costura. |
US7744708B2 (en) * | 2006-03-14 | 2010-06-29 | Tenaris Connections Limited | Methods of producing high-strength metal tubular bars possessing improved cold formability |
WO2008000300A1 (en) * | 2006-06-29 | 2008-01-03 | Tenaris Connections Ag | Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same |
MX2007004600A (es) * | 2007-04-17 | 2008-12-01 | Tubos De Acero De Mexico S A | Un tubo sin costura para la aplicación como secciones verticales de work-over. |
US7862667B2 (en) | 2007-07-06 | 2011-01-04 | Tenaris Connections Limited | Steels for sour service environments |
EP2238272B1 (en) * | 2007-11-19 | 2019-03-06 | Tenaris Connections B.V. | High strength bainitic steel for octg applications |
CA2686301C (en) * | 2008-11-25 | 2017-02-28 | Maverick Tube, Llc | Compact strip or thin slab processing of boron/titanium steels |
EP2325435B2 (en) | 2009-11-24 | 2020-09-30 | Tenaris Connections B.V. | Threaded joint sealed to [ultra high] internal and external pressures |
US9163296B2 (en) | 2011-01-25 | 2015-10-20 | Tenaris Coiled Tubes, Llc | Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment |
IT1403689B1 (it) | 2011-02-07 | 2013-10-31 | Dalmine Spa | Tubi in acciaio ad alta resistenza con eccellente durezza a bassa temperatura e resistenza alla corrosione sotto tensioni da solfuri. |
IT1403688B1 (it) | 2011-02-07 | 2013-10-31 | Dalmine Spa | Tubi in acciaio con pareti spesse con eccellente durezza a bassa temperatura e resistenza alla corrosione sotto tensione da solfuri. |
US8636856B2 (en) | 2011-02-18 | 2014-01-28 | Siderca S.A.I.C. | High strength steel having good toughness |
US8414715B2 (en) | 2011-02-18 | 2013-04-09 | Siderca S.A.I.C. | Method of making ultra high strength steel having good toughness |
US9403242B2 (en) * | 2011-03-24 | 2016-08-02 | Nippon Steel & Sumitomo Metal Corporation | Steel for welding |
US9340847B2 (en) | 2012-04-10 | 2016-05-17 | Tenaris Connections Limited | Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same |
CN103451550B (zh) * | 2012-06-01 | 2015-07-15 | 北京奇峰聚能科技有限公司 | 储能飞轮铸件用合金钢及储能飞轮铸件铸造方法 |
CA2897451C (en) | 2013-01-11 | 2019-10-01 | Tenaris Connections Limited | Galling resistant drill pipe tool joint and corresponding drill pipe |
US9187811B2 (en) | 2013-03-11 | 2015-11-17 | Tenaris Connections Limited | Low-carbon chromium steel having reduced vanadium and high corrosion resistance, and methods of manufacturing |
US9803256B2 (en) | 2013-03-14 | 2017-10-31 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
EP2789700A1 (en) | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
EP2789701A1 (en) | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
KR102368928B1 (ko) | 2013-06-25 | 2022-03-04 | 테나리스 커넥션즈 비.브이. | 고크롬 내열철강 |
US9850553B2 (en) | 2014-07-22 | 2017-12-26 | Roll Forming Corporation | System and method for producing a hardened and tempered structural member |
BR102016001063B1 (pt) * | 2016-01-18 | 2021-06-08 | Amsted Maxion Fundição E Equipamentos Ferroviários S/A | liga de aço para componentes ferroviários, e processo de obtenção de uma liga de aço para componentes ferroviários |
US11124852B2 (en) | 2016-08-12 | 2021-09-21 | Tenaris Coiled Tubes, Llc | Method and system for manufacturing coiled tubing |
KR101777974B1 (ko) * | 2016-08-23 | 2017-09-12 | 현대제철 주식회사 | 철근 및 그 제조 방법 |
US10434554B2 (en) | 2017-01-17 | 2019-10-08 | Forum Us, Inc. | Method of manufacturing a coiled tubing string |
US11701539B2 (en) * | 2019-02-22 | 2023-07-18 | Jaquish Biomedical Corporation | Variable resistance exercise devices |
CN110106445B (zh) * | 2019-06-05 | 2021-04-16 | 上海大学 | 一种用于海洋平台铸造节点高强度高低温韧性用钢及其制备方法 |
EP4028563A4 (en) | 2019-09-19 | 2022-07-27 | Nucor Corporation | EXTREMELY WEATHER RESISTANT STEEL FOR HOT STAMPING APPLICATIONS |
CN111876696B (zh) * | 2020-07-23 | 2021-08-24 | 江阴兴澄特种钢铁有限公司 | 一种服役温度可达-60℃以下的x100管件用钢板及其制造方法 |
CN118234546A (zh) | 2021-10-06 | 2024-06-21 | 贾奎什生物医学公司 | 提供感觉反馈的健身杆 |
NL2032426B1 (en) * | 2022-07-08 | 2024-01-23 | Tenaris Connections Bv | Steel composition for expandable tubular products, expandable tubular article having this steel composition, manufacturing method thereof and use thereof |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413166A (en) * | 1965-10-15 | 1968-11-26 | Atomic Energy Commission Usa | Fine grained steel and process for preparation thereof |
US3655465A (en) * | 1969-03-10 | 1972-04-11 | Int Nickel Co | Heat treatment for alloys particularly steels to be used in sour well service |
US3915697A (en) * | 1975-01-31 | 1975-10-28 | Centro Speriment Metallurg | Bainitic steel resistant to hydrogen embrittlement |
US4812182A (en) * | 1987-07-31 | 1989-03-14 | Hongsheng Fang | Air-cooling low-carbon bainitic steel |
JPH07331381A (ja) * | 1994-06-06 | 1995-12-19 | Nippon Steel Corp | 高強度高靭性継目無鋼管およびその製造法 |
GB2297094B (en) * | 1995-01-20 | 1998-09-23 | British Steel Plc | Improvements in and relating to Carbide-Free Bainitic Steels |
CA2231985C (en) * | 1997-03-26 | 2004-05-25 | Sumitomo Metal Industries, Ltd. | Welded high-strength steel structures and methods of manufacturing the same |
US5993570A (en) * | 1997-06-20 | 1999-11-30 | American Cast Iron Pipe Company | Linepipe and structural steel produced by high speed continuous casting |
JP3562353B2 (ja) * | 1998-12-09 | 2004-09-08 | 住友金属工業株式会社 | 耐硫化物応力腐食割れ性に優れる油井用鋼およびその製造方法 |
US6866725B2 (en) * | 2000-02-28 | 2005-03-15 | Nippon Steel Corporation | Steel pipe excellent in formability and method of producing the same |
WO2002063058A1 (fr) * | 2001-02-07 | 2002-08-15 | Nkk Corporation | Feuille d"acier mince et procede de fabrication de ladite feuille |
US6669789B1 (en) * | 2001-08-31 | 2003-12-30 | Nucor Corporation | Method for producing titanium-bearing microalloyed high-strength low-alloy steel |
US6669285B1 (en) * | 2002-07-02 | 2003-12-30 | Eric Park | Headrest mounted video display |
WO2004097059A1 (es) * | 2003-04-25 | 2004-11-11 | Tubos De Acero De Mexico, S.A. | Tubo de acero sin costura para ser utilizado como canalizador y proceso de obtencíon del mismo |
AR047467A1 (es) * | 2004-01-30 | 2006-01-18 | Sumitomo Metal Ind | Tubo de acero sin costura para pozos petroliferos y procedimiento para fabricarlo |
US7566416B2 (en) * | 2004-10-29 | 2009-07-28 | Sumitomo Metal Industries, Ltd. | Steel pipe for an airbag inflator and a process for its manufacture |
JP4792778B2 (ja) * | 2005-03-29 | 2011-10-12 | 住友金属工業株式会社 | ラインパイプ用厚肉継目無鋼管の製造方法 |
JP4635764B2 (ja) * | 2005-07-25 | 2011-02-23 | 住友金属工業株式会社 | 継目無鋼管の製造方法 |
MXPA05008339A (es) * | 2005-08-04 | 2007-02-05 | Tenaris Connections Ag | Acero de alta resistencia para tubos de acero soldables y sin costura. |
US7744708B2 (en) * | 2006-03-14 | 2010-06-29 | Tenaris Connections Limited | Methods of producing high-strength metal tubular bars possessing improved cold formability |
JP4751224B2 (ja) * | 2006-03-28 | 2011-08-17 | 新日本製鐵株式会社 | 靭性と溶接性に優れた機械構造用高強度シームレス鋼管およびその製造方法 |
US20080226396A1 (en) * | 2007-03-15 | 2008-09-18 | Tubos De Acero De Mexico S.A. | Seamless steel tube for use as a steel catenary riser in the touch down zone |
CN101514433A (zh) * | 2007-03-16 | 2009-08-26 | 株式会社神户制钢所 | 低温冲击特性优异的汽车用高强度电阻焊钢管及其制造方法 |
MX2007004600A (es) * | 2007-04-17 | 2008-12-01 | Tubos De Acero De Mexico S A | Un tubo sin costura para la aplicación como secciones verticales de work-over. |
JP5020690B2 (ja) * | 2007-04-18 | 2012-09-05 | 新日本製鐵株式会社 | 機械構造用高強度鋼管及びその製造方法 |
US7862667B2 (en) * | 2007-07-06 | 2011-01-04 | Tenaris Connections Limited | Steels for sour service environments |
EP2238272B1 (en) * | 2007-11-19 | 2019-03-06 | Tenaris Connections B.V. | High strength bainitic steel for octg applications |
US8414715B2 (en) * | 2011-02-18 | 2013-04-09 | Siderca S.A.I.C. | Method of making ultra high strength steel having good toughness |
US8636856B2 (en) * | 2011-02-18 | 2014-01-28 | Siderca S.A.I.C. | High strength steel having good toughness |
-
2009
- 2009-06-17 US US12/486,610 patent/US20100319814A1/en not_active Abandoned
-
2010
- 2010-06-17 AR ARP100102149A patent/AR077129A1/es active IP Right Grant
- 2010-06-17 EP EP10166261.7A patent/EP2287346B1/en active Active
- 2010-06-17 MX MX2010006761A patent/MX2010006761A/es active IP Right Grant
- 2010-06-17 BR BRPI1004267-9A patent/BRPI1004267B1/pt active IP Right Grant
- 2010-06-17 JP JP2010138504A patent/JP5787492B2/ja active Active
Also Published As
Publication number | Publication date |
---|---|
EP2287346A1 (en) | 2011-02-23 |
BRPI1004267A2 (pt) | 2012-03-20 |
US20100319814A1 (en) | 2010-12-23 |
JP2011006790A (ja) | 2011-01-13 |
BRPI1004267B1 (pt) | 2020-12-22 |
MX2010006761A (es) | 2010-12-22 |
JP5787492B2 (ja) | 2015-09-30 |
EP2287346B1 (en) | 2019-12-18 |
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