WO2011119166A1 - Barre d'armature haute résistance - Google Patents

Barre d'armature haute résistance Download PDF

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Publication number
WO2011119166A1
WO2011119166A1 PCT/US2010/028713 US2010028713W WO2011119166A1 WO 2011119166 A1 WO2011119166 A1 WO 2011119166A1 US 2010028713 W US2010028713 W US 2010028713W WO 2011119166 A1 WO2011119166 A1 WO 2011119166A1
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WO
WIPO (PCT)
Prior art keywords
weight
rebar
niobium
carbon
vanadium
Prior art date
Application number
PCT/US2010/028713
Other languages
English (en)
Inventor
Winky Lai
Cameron A. Cossette
James F. Petersen
Original Assignee
Winky Lai
Cossette Cameron A
Petersen James F
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 Winky Lai, Cossette Cameron A, Petersen James F filed Critical Winky Lai
Priority to MX2012007389A priority Critical patent/MX343359B/es
Priority to CA2786371A priority patent/CA2786371A1/fr
Priority to PCT/US2010/028713 priority patent/WO2011119166A1/fr
Publication of WO2011119166A1 publication Critical patent/WO2011119166A1/fr

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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
    • C22C38/18—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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Definitions

  • This disclosure relates generally to a high strength, hot rolled steel with high mechanical strength which meets the requirements of construction, in particular, rebar suitable for construction in areas prone to seismic activity, comprising iron, at most about 0.5% by weight carbon, at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • Concrete is one of the most widely used construction materials, which exhibits a high compressive strength, but a low tensile strength.
  • This drawback of concrete has been solved in construction, at least in part, by introducing in the stress zones of the concrete construction elements, steel rods or other steel reinforcements that absorb and otherwise relieve the tensile stresses from the concrete.
  • Steel is particularly advantageous in the construction of concrete elements. Such steels must exhibit good carrying capacity and be able to be used in the preparation of constructions, typically by casing with concrete elements.
  • Rebar typically used for concrete reinforcement is generally fabricated in grades of 40, 60 ,75, and 80, meaning a minimum absolute strength of 40, 60, 75, and 80 ksi, respectively.
  • Such steel and rebar disclosed herein is generally useful for construction in confinement applications, for example in combination with concrete elements, especially for construction in areas prone to seismic activity.
  • the disclosed and described steel rebar optimizes mechanical strength, thus, enabling reduced amount of steel used while providing the strength required and improves the constructability by reducing congestion in the structure.
  • Methods of improving the resistance of building elements to seismic activity using the steel rebar disclosed herein are also provided.
  • a high mechanical strength reinforcement steel is provided.
  • the steel consists essentially of, in addition to iron, at most about 0.5% by weight carbon, at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • a high mechanical strength reinforcement steel consisting essentially of, in addition to iron, at least about 0.1% and at most about 0.5% by weight carbon, at least about 0.1 % and at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel, is provided.
  • a high mechanical strength reinforcement steel is provided.
  • the steel consists essentially of, in addition to iron, at most about 0.5% by weight carbon, at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, at most about 0.05% by weight of molybdenum, at most about 0.7% by weight of copper and/or nickel, at most about 0.1% by weight of phosphorous and/or sulfur, at most 500 ppm of nitrogen, and the usual residual elements of scrap steel.
  • a reinforcing bar having the composition of any of the first, second or third embodiments is provided.
  • the reinforcing bar of size #3 rebar to size #18 rebar has a yield strength of at least 90 ksi.
  • rebar of size #5 and size #6 having a yield strength of at least 90 ksi is provided.
  • a concrete form comprising at least one rebar having a composition of any of the first, second or third embodiments is provided.
  • a method of fabricating a high strength rebar comprises providing a scrap metal melt comprising substantially iron and residual elements, analyzing a sample of the scrap metal melt, and adjusting the elemental composition of the scrap metal melt based on the analysis.
  • the adjusted composition provides a size #3 rebar to size #18 rebar sized rebar with a yield strength of at least 90 ksi.
  • the melt is adjusted to a composition consisting essentially of, in addition to iron, at most about 0.5% by weight carbon, at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • the melt is adjusted to a composition consisting essentially of, in addition to iron, at least about 0.3% and at most about 0.4% by weight carbon, at least about 0.1 % and at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • the melt is adjusted to a composition consisting essentially of, in addition to iron, at most 0.5% by weight carbon, at most 0.5% by weight vanadium and/or niobium, at most 1.7% by weight of manganese, at most 0.5% by weight of silicon, at most 0.05% by weight of molybdenum, at most 0.7% by weight of copper and/or nickel, at most 0.1% by weight of phosphorous and/or sulfur, at most 500 ppm of nitrogen, and the usual residual elements of scrap steel.
  • the method further comprises hot rolling the melt.
  • a method of reinforcing a dwelling from damage resulting from seismic activity comprises providing, as a component of the dwelling, at least one rebar of a composition consisting essentially of, in addition to iron, at most about 0.5% by weight carbon, at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • the rebar composition is at least about 0.3% and at most about 0.4% by weight carbon, at least about 0.1 % and at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • the rebar composition consists essentially of, in addition to iron, at most 0.5% by weight carbon, at most 0.5% by weight vanadium and/or niobium, at most 1.7% by weight of manganese, at most 0.5% by weight of silicon, at most 0.05% by weight of molybdenum, at most 0.7% by weight of copper and/or nickel, at most 0.1% by weight of phosphorous and/or sulfur, at most 500 ppm of nitrogen, and the usual residual elements of scrap steel.
  • the component of the dwelling comprises a concrete construction element comprising the at least one rebar. Alone or in combination with any of the previous aspects of the seventh embodiment, the rebar is of size #3 rebar to size #18 rebar with a yield strength of at least 90 ksi.
  • FIG. 1 depicts a flow diagram of the process disclosed and described herein.
  • FIG. 2. is a summary TABLE 1 of iron compositions disclosed and described herein.
  • FIG. 3. is a summary TABLE 2 of mechanical properties of rebar disclosed and described herein.
  • Improvements in steel rebar and concrete elements is desirable for construction to reduce weight, cost, constructability, and to provide resistance to damage during seismic activity.
  • Disclosed and described herein are steel compositions and methods of fabricating steel rebar that is particularly advantageous, for example, in the construction of concrete elements with complex properties.
  • Such steel and steel containing concrete elements exhibit good characteristics of carrying capacity and are suitable in the preparation of constructions, for example, by casing the instant rebar with concrete elements, in areas prone to seismic activity.
  • high strength rebar disclosed and described herein is intended to absorb or eliminate, after their introduction, the tensile and shearing stresses to which the reinforced construction elements are subjected.
  • the rebar disclosed and described herein is provided as reinforcement steel for concrete construction elements.
  • such reinforcement steels can be hot-rolled.
  • the high strength steels and rebar formed therefrom are alloyed with vanadium and/or niobium.
  • the instant high strength rebar is hot-rolled to a predetermined apparent elastic limit, a suitable ductility.
  • the instant high strength rebar provides for increased tensile and yield strength at reduced diameter, for example rebar of grade 90 ksi or higher.
  • the instant rebar provides for improved reinforcement of concrete, capable of reducing the total weight steel/weight concrete of the construction element and providing excellent stress absorbing properties for building, especially buildings in regions prone to seismic stresses.
  • the instant high strength rebar when used as an non pre-stressed
  • reinforcement steel in concrete exhibits plasticity resistant to cracking of the concrete prior to breaking failure of the steel, such stresses typically resulting from bending stresses during construction and seismic activity after construction.
  • the steel compositions and rebar disclosed and described herein provide a reinforcement steel that has a high mechanical strength, fabricated in the hot-rolled state, the instant reinforcement steel consists essentially of, in addition to iron, at most 0.5% by weight carbon, at most about 0.5% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, at most about 0.05% by weight of molybdenum, at most about 0.7% by weight of copper and/or nickel, at most about 0.1% by weight of phosphorous and/or sulfur, at most about 500 ppm of nitrogen, and the usual residual elements of scrap steel.
  • the above composition is greater than about 0.1% but less than about 0.5% by weight carbon, and not more than about 0.2% by weight vanadium and/or niobium. In other aspects, the above composition is greater than about 0.30% but less than about 0.4% by weight carbon, not more than 0.2 % by weight vanadium and/or niobium, and not less than about 0.05% by weight molybdenum.
  • a reinforcement steel having a high mechanical strength, fabricated in the hot-rolled state consists essentially of, in addition to iron, of at most about 0.5% by weight carbon, preferably less that about 0.4 wt% carbon, and most preferably between 0.3-0.4wt % carbon, at most about 0.5% by weight vanadium and/or niobium, preferably at most about 0.3 % by weight vanadium and/or niobium, most preferably at most about 0.2% by weight vanadium and/or niobium, at most about 1.7% by weight of manganese, at most about 0.5% by weight of silicon, and the usual residual elements of scrap steel.
  • process 100 for providing the high strength steel composition is presented.
  • Iron scrap is heated in a furnace to provide scrap melt (block 110).
  • Introduction of alloying additions, e.g., vanadium and/or manganese is performed while the molten steel is tapped into a ladle and positioned at stir station (block 120).
  • Sampling event of the melt for chemical composition is performed (block 130).
  • Stirring and mixing is commenced at stir station to ensure alloy additions added during tap are evenly distributed in melt (block 140).
  • Second sampling event is performed (block 150). Determination of whether the desired chemical composition is obtained by analysis of the melt is performed (block 160).
  • melt is transferred to caster with ladle contents being sampled at beginning of ladle, at about half way thru the ladle, and near the end of ladle (block 170) to ensure homogeneity of the molten steel throughout the cast.
  • Casting of steel is performed (block 180) with optional hot rolling, e.g., to form rebar.
  • the instant steel compositions provide for rebar with plasticity, capability for hot and cold deformation and useful strength of the reinforcing steel compared to the comparative example of similar, but distinct, composition.
  • the instant reinforcement steel disclosed and described herein also contains in its chemical composition certain micro-alloying compounds held within a certain predetermined range that, without being held to any particular theory, provide at least in part, some of the improved tensile and yield properties observed at an otherwise lower carbon content.
  • the strength of the instant steel is obtained without much of a cost in ductility.
  • a reduced diameter of the instant rebar as a reinforced steel significantly reduces the weight of the concrete construction element while the prescribed concrete layer can be maintained.
  • the reinforcement steel disclosed and described herein can be prepared and worked in installations commonly used for reinforcement steels, eliminating new installations and investments.
  • a steel alloy suitable for use in rebar was produced by melting scrap steel in an electric arc furnace. After the melt was formed, samples were taken for analysis. Based on the analysis, appropriate alloying additions were made to the melt. The steps of analysis-alloying additions were repeated as needed to arrive at a heat of predetermined composition. Vanadium and/or niobium were added to the molten steel as one of the alloying additions.
  • the molten charge can be overheated at a temperature superior to the temperature of the casting and then poured into refining ladles.
  • Analysis of the melt in the ladles can be performed to ensure complete mixing of the alloying additions.
  • Analysis of the melt and alloying additions can be performed with the aid of algorithms, which can further be coupled to and controlled by automated dispensors and the like. For example, algorithmic equations based on prior histories, historical data, previous properties observed, etc., suitable for adjusting the wt% carbon levels with micro-alloying elements such as vanadium and/or niobium and/or manganese etc., to target specific tensile, yield, and elongation properties, can be used.
  • the content of the ladles can then be poured in a continuous casting installation, for example, a predetermined cross sectional billet at about 1850 °F. Billets are then reheated to temperature at about 1900 °F and rolled into the desired diameter. The rolled bars are exited from the mill at about 1700 °F into a cooling bed at about 1500 °F, and then air cooled. Bars of predetermined diameter were then cut into appropriate lengths. Samples were tested and provided the following mechanical results.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

La présente invention se rapporte à un acier de renforcement présentant une résistance mécanique élevée et comprenant, en plus du fer, du carbone en une quantité d'environ 0,5 % en poids au maximum, du vanadium et/ou du niobium en une quantité d'environ 0,5 % en poids au maximum et les éléments résiduels habituels des ferrailles. La présente invention se rapporte également à un procédé de renforcement d'un logement et le protégeant des dégâts résultant de l'activité sismique, le procédé consistant à utiliser, comme composant du logement, au moins une barre d'armature ayant une composition comprenant, en plus du fer, du carbone en une quantité d'environ 0,5 % en poids au maximum, du vanadium et/ou du niobium en une quantité d'environ 0,5 % en poids au maximum, du manganèse en une quantité d'environ 1,7 % en poids au maximum, du silicium en une quantité d'environ 0,5 % en poids au maximum, et les éléments résiduels habituels des ferrailles.
PCT/US2010/028713 2010-03-25 2010-03-25 Barre d'armature haute résistance WO2011119166A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
MX2012007389A MX343359B (es) 2010-03-25 2010-03-25 Rebar de alta resistencia.
CA2786371A CA2786371A1 (fr) 2010-03-25 2010-03-25 Barre d'armature haute resistance
PCT/US2010/028713 WO2011119166A1 (fr) 2010-03-25 2010-03-25 Barre d'armature haute résistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2010/028713 WO2011119166A1 (fr) 2010-03-25 2010-03-25 Barre d'armature haute résistance

Publications (1)

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WO2011119166A1 true WO2011119166A1 (fr) 2011-09-29

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CA (1) CA2786371A1 (fr)
MX (1) MX343359B (fr)
WO (1) WO2011119166A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104745968A (zh) * 2014-12-24 2015-07-01 福建三宝特钢有限公司 一种hrb500e抗震钢筋及其制备方法
CN111334719A (zh) * 2020-04-13 2020-06-26 江苏永钢集团有限公司 一种高N复合强化500MPa级和600MPa级钢筋及冶炼方法和生产方法
CN114317884A (zh) * 2022-01-07 2022-04-12 河北科技大学 一种用于全废钢电弧炉冶炼的残余元素含量调控方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114606427A (zh) * 2022-02-16 2022-06-10 首钢集团有限公司 一种hrb400e抗震钢筋额制备方法及hrb400e抗震钢筋

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406713A (en) * 1981-03-20 1983-09-27 Kabushiki Kaisha Kobe Seiko Sho Method of making high-strength, high-toughness steel with good workability
US4619714A (en) * 1984-08-06 1986-10-28 The Regents Of The University Of California Controlled rolling process for dual phase steels and application to rod, wire, sheet and other shapes
JPH10195600A (ja) * 1996-12-19 1998-07-28 Korea Iron & Steel Works Co Ltd 溶接性に優れた高強度低合金鋼線
US20060188384A1 (en) * 2004-03-29 2006-08-24 Kan Michael Y High strength steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406713A (en) * 1981-03-20 1983-09-27 Kabushiki Kaisha Kobe Seiko Sho Method of making high-strength, high-toughness steel with good workability
US4619714A (en) * 1984-08-06 1986-10-28 The Regents Of The University Of California Controlled rolling process for dual phase steels and application to rod, wire, sheet and other shapes
JPH10195600A (ja) * 1996-12-19 1998-07-28 Korea Iron & Steel Works Co Ltd 溶接性に優れた高強度低合金鋼線
US20060188384A1 (en) * 2004-03-29 2006-08-24 Kan Michael Y High strength steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104745968A (zh) * 2014-12-24 2015-07-01 福建三宝特钢有限公司 一种hrb500e抗震钢筋及其制备方法
CN104745968B (zh) * 2014-12-24 2017-02-01 福建三宝特钢有限公司 一种hrb500e抗震钢筋及其制备方法
CN111334719A (zh) * 2020-04-13 2020-06-26 江苏永钢集团有限公司 一种高N复合强化500MPa级和600MPa级钢筋及冶炼方法和生产方法
CN114317884A (zh) * 2022-01-07 2022-04-12 河北科技大学 一种用于全废钢电弧炉冶炼的残余元素含量调控方法
CN114317884B (zh) * 2022-01-07 2023-01-20 河北科技大学 一种用于全废钢电弧炉冶炼的残余元素含量调控方法

Also Published As

Publication number Publication date
CA2786371A1 (fr) 2011-09-29
MX343359B (es) 2016-11-03
MX2012007389A (es) 2013-08-08

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