WO2023101641A1 - Acier micro-allié à haute résistance et procédé de production associé - Google Patents

Acier micro-allié à haute résistance et procédé de production associé Download PDF

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Publication number
WO2023101641A1
WO2023101641A1 PCT/TR2022/051237 TR2022051237W WO2023101641A1 WO 2023101641 A1 WO2023101641 A1 WO 2023101641A1 TR 2022051237 W TR2022051237 W TR 2022051237W WO 2023101641 A1 WO2023101641 A1 WO 2023101641A1
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Prior art keywords
ratio
weight
strength
micro
alloyed steel
Prior art date
Application number
PCT/TR2022/051237
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English (en)
Inventor
Fulya EYÇİN
Osman ÇULHA
Ferit SİMSAROĞLU
Original Assignee
Ti̇rsan Kardan Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇
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
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Priority claimed from TR2021/018772 external-priority patent/TR2021018772A2/tr
Application filed by Ti̇rsan Kardan Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ filed Critical Ti̇rsan Kardan Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇
Publication of WO2023101641A1 publication Critical patent/WO2023101641A1/fr

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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • 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
    • C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/12—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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/38—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/009—Pearlite

Definitions

  • the invention relates to high-strength, low-alloy steel developed to be used in all areas that can be used in hot forging processes as a long product raw material.
  • the invention particularly relates to a micro-alloyed steel composition
  • a micro-alloyed steel composition comprising; carbon (C) in the ratio of 0.400-0.430% by weight, silicon (Si) in a ratio of 0.250-0.300% by weight, manganese (Mn) in a ratio of 1.600-1.650% by weight, chromium (Cr) in a ratio of 0-0.120% by weight, molybdenum (Mo) in a ratio of 0-0.050% by weight, nickel (Ni) in a ratio of 0- 0.120% by weight, aluminum (Al) in a ratio of 0-0.015% by weight, vanadium (V) in a ratio of 0.015-0.025% by weight, tin (Sn) in a ratio of 0-0.005 % by weight, phosphorus (P) in a ratio of 0-0.010% by weight, sulfur (S) in a ratio of 0-0.090% by weight, copper (Cu) in a ratio of 0- 0.
  • micro-alloyed steels The most important group of engineering materials is made up of steels. There are continuous improvements in the process and physical metallurgy of steels to meet all kinds of demands and changes. In recent years, the development of micro-alloyed steels has been seen as one of the most important metallurgical successes. It can be said that this development is the result of a clear understanding of the structure-feature relations in low- carbon steels. The final product is the result of a successful combination of physical, mechanical, and process metallurgy. Micro-alloyed steels successfully replace mild steels as basic building materials.
  • the total amount of alloy usually does not exceed 2%. While most of these alloy elements are formed by niobium (Nb), titanium (Ti), and vanadium (V), the nanometer-sized precipitates formed by these alloy elements with carbon (C) and nitrogen (N) atoms provide high yield strength to steel. In addition, its mechanical properties such as high corrosion resistance, ductility, and toughness also increase the use of micro-alloyed steels.
  • the specific development aspects of micro-alloyed steels consist of low-perlite and nonperlite steels. Features such as formability, toughness, and weldability are significantly increased by significantly lowering the carbon ratio.
  • Carbide, nitride, and carbonitrides formed by micro-alloy elements remain undissolved in the austenite phase if the dissolution temperatures are not exceeded during hot forming processes. These insoluble hard structures prevent austenite grain growth and provide both a small-grained steel structure and increase the toughness of the material.
  • the invention which is the subject of the patent document number EP1929053B1 found in the literature, is related to the production process of a multi-phase microstructured steel part.
  • Chemical composition of the steel subject to the invention 0.01% ⁇ C ⁇ 0.50, 50% ⁇ Mn ⁇ 3.0%, Cr ⁇ 1.5%, 0.01% ⁇ Si ⁇ 3.0%, 0.005% ⁇ AI ⁇ 3.0%, Mo ⁇ 1.0%, P ⁇ 0.10%, Ti ⁇ 0.20%, V ⁇ 0.1% and optionally Ni ⁇ 2.0%, Cu ⁇ 2.0% , S ⁇ 0.05%, Nb ⁇ O.15%, the rest contains iron and impurities from the preparation process.
  • the multiphase microstructure of the steel contains 25 to 75% superficial ferrite and 25 to 75% superficial martenist and/or bainite.
  • Patent application EP1070153B1 relates to a steel composition containing 0.6-0.65% carbon (C) by weight, maximum 0.4% silicon (Si), 0.6-0.9% manganese (Mn), 0.03-0.07% phosphorus (P), 0.07-0.11% sulfur (S), maximum 0.5% chromium (Cr), maximum 0.1% molybdenum (Mo), maximum 0.5% nickel (Ni), 0.5% copper (Cu), maximum 0.5% aluminum (Al), maximum 0.03% nitrogen (N), vanadium and iron.
  • the present invention relates to high-strength micro-alloyed steel and related production method that meets the aforementioned needs and eliminates all the disadvantages and provides advantages thereof.
  • the object of the invention is to provide high-strength, micro-alloyed steel developed to be used in all areas that can be used in hot forging processes as a long product raw material.
  • the object of the invention is to obtain steel with a
  • the object of the invention is to to activate the strength increase mechanism by grain refinement and to increase the strength with toughness, by using vanadium as the sole carbide builder, aluminum in deoxidation, nitrogen in terms of forming nitrides in casting and forming temperatures and controlled cooling.
  • the object of the invention is to provide the effect of the grain thinning elements because in the primary cooling the heat convection coefficient is 80-120 W/m 2 K for 100-130 seconds, in secondary cooling, the heat convection coefficient is 40-60 W/m 2 K for 1200-1500 seconds, which are required for the forging temperature and post-forging cooling environment, i
  • the object of the invention is to apply the strength enhancement mechanism together with solid melt hardening and grain size reduction.
  • the object of the invention is to present an alloy composition and a controlled cooling process that together increase the strengthening mechanism, toughness and strength.
  • the object of the invention is to provide an alloy composition that does not adversely affect weldability.
  • the object of the invention is to achieve an increase in strength with ferrite and bainite phase structure, i
  • the invention is a high-strength, low-alloy microalloyed steel developed to be used in all areas that can be used in hot forging processes as long product raw material, characterized in that; it comprises a steel composition containing ⁇ carbon (C) in the ratio of 0.400-0.430% by weight, silicon (Si) in a ratio of 0.250-0.300% by weight, manganese (Mn) in a ratio of 1.600-1.650% by weight, chromium (Cr) in a ratio of 0- 0.120% by weight, molybdenum (Mo) in a ratio of 0-0.050% by weight, nickel (Ni) in a ratio of 0-0.120% by weight, aluminum (Al) in a ratio of 0-0.015% by weight, vanadium (V) in a ratio of 0.015-0.025% by weight, tin (Sn) in a ratio of 0-0.005 % by weight, phosphorus (P) in a ratio
  • C ⁇ carbon
  • High-strength Micro-alloyed steel has a yield strength of 615-630 MPa, a tensile strength of 850-880 MPa, a hardness of 260-275 HV, and an equivalent carbon value of 0.660-0.770 Ceq to achieve the objects of the invention.
  • the invention is a high-strenght micro-alloyed steel production method, comprising the following process steps:
  • the said forging temperature is 1200°C
  • the primary cooling after forging is for 100- 130 seconds with a heat convection coefficient of 80-120 W/m 2 K
  • the secondary cooling is for 1200-1500 seconds with a heat convection coefficient of 40-60 W/m 2 K under atmospheric conditions
  • the invention is a high-strength, low-alloy micro-alloyed steel developed to be used in all areas that can be used in hot forging processes as long product raw material, characterized in that; it comprises a steel composition containing carbon (C) in the ratio of 0.400-0.430% by weight, silicon (Si) in a ratio of 0.250-0.300% by weight, manganese (Mn) in a ratio of 1.600- 1.650% by weight, chromium (Cr) in a ratio of 0-0.120% by weight, molybdenum (Mo) in a ratio of 0-0.050% by weight, nickel (Ni) in a ratio of 0-0.120% by weight, aluminum (Al) in a ratio of 0-0.015% by weight, vanadium (V) in a ratio of 0.015-0.025% by weight, tin (Sn) in a ratio of 0-0.005 % by weight, phosphorus (P) in a ratio of 0-0.010% by weight,
  • the alloy elements are first determined.
  • the amount and variety of alloy elements in the steel composition are important parameters in the development of mechanical properties.
  • the nitride-, carbide-, and carbonitride-making properties of vanadium (V) with interstitial atoms such as carbon (C), and nitrogen (N) are used.
  • V vanadium
  • C carbon
  • N nitrogen
  • TTT isothermal conversion diagram
  • OCT continuous cooling conversion diagram
  • TTT isothermal conversion diagram
  • CCT continuous cooling conversion diagram
  • TTT diagrams are preferred in determining the phase conversions that will occur in the alloy under extreme cooling conditions as a function of temperature and time, i
  • Curves showing this situation are called continuous cooling conversion curves (CCT).
  • CCT diagrams can be used for all thermal processes involving continuous cooling.
  • the main purpose of CCT diagrams is to know in advance which structural elements can be obtained and which hardness can be obtained by using the cooling curve.
  • Vanadium is used as the sole carbide builder in the steel composition, and aluminum, which is also used in deoxidation, is used.
  • Nitrogen is in the steel composition in terms of forming nitrides at casting and forming temperatures and controlled cooling.
  • the steel composition produced by micro-alloying is obtained in the form of billet by continuous casting method using electric arc furnace, crucible furnace, vacuum furnace, and tundish immersion closed ceramic tube, respectively,
  • the produced billets are made into cylindrical semi-finished and long semi-finished products in the round long group by hot rolling,
  • the hot forging temperature used in the inventive production method is 1200°C
  • the primary cooling after forging is carried out under atmospheric conditions with a heat convection coefficient of 80-120 W/m 2 K for 100-130 seconds
  • the secondary cooling is carried out with a heat convection coefficient of 40-60 W/m 2 K for 1200-1500 seconds.
  • Convection is a type of heat transfer between a solid surface and the fluid (liquid or gas) in motion adjacent to it. The faster the fluid movement, the greater the heat transfer through convection. If the mass or mass fluid movement disappears, the heat transfer between the solid surface and the adjacent fluid occurs only by random movement of the molecules, i.e. by conduction.
  • Heat convection coefficient is defined as the amount of heat carried from the unit surface area in the unit temperature difference and in the unit time. This coefficient differs depending on various elements. Some of these elements are the material and roughness of the surface with which the fluid contacts, flow pattern, flow rate, hydraulic diameter, viscosity, and density of the fluid.
  • the heat convection coefficient is different according to the type of heat convection.
  • thermal insulation materials The most determining feature in the selection of thermal insulation materials is the heat transmission coefficient. Because the lower the heat transmission coefficient, the higher the thermal insulation resistance of the systems. Knowing the thermal properties of the materials is very important in terms of achieving optimum performance where the material is used. Many measurement techniques have been used for this purpose for many years. Thermal properties of the materials (thermal conductivity coefficient, specific heat, thermal permeability) can be measured with the current techniques. Especially recently, there are complexities in the micro and macro level internal structure of the materials developed, and it is difficult to make accurate measurements under this condition, i
  • thermal insulation material or the production of new material is very important in this regard. It is necessary to know the heat transmission coefficient of that material to make the calculations after the production of new material or material selection.
  • V-C precipitates are formed with a i10-15% ferrite phase, 52-58% perlite phase, and 30-35% bainite phase.
  • the mechanical properties of the micro-alloyed steel of the invention are as follows:
  • the long product mentioned in the preferred embodiment of the invention covers all hot- rolled, square, round, and flat steel products ⁇
  • the equivalent carbon value of the micro-alloyed steel of the invention is 0.660-0.770 Ceq. Carbon equivalent is a measure that defines weldability, and calculation is made with the amounts of alloy elements in steel. The values of the specified alloys are equivalent to the steel to be substituted and provide an advantage in terms of creating higher strength. The formula used to calculate the Ceq within the scope of the invention is given below.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne en particulier une composition d'acier micro-allié comprenant : du carbone (C) dans une proportion de 0,400 à 0,430 % en poids, du silicium (Si) dans une proportion de 0,250 à 0,300 % en poids, du manganèse (Mn) dans une proportion de 1,600 à 1,650 % en poids, du chrome (Cr) dans une proportion de 0 à 0,120 % en poids, du molybdène (Mo) dans une proportion de 0 à 0,050 % en poids, du nickel (Ni) dans une proportion de 0 à 0,120 % en poids, de l'aluminium (Al) dans une proportion de 0 à 0,015 % en poids, du vanadium (V) dans une proportion de 0,015 à 0,025 % en poids, de l'étain (Sn) dans une proportion de 0 à 0,005 % en poids, du phosphore (P) dans une proportion de 0 à 0,010 % en poids, du soufre (S) dans une proportion de 0 à 0,090 % en poids, du cuivre (Cu) dans une proportion de 0 à 0,150 % en poids et de l'azote (N) présentant une quantité de 70 à 140 ppm et de 10 à 15 % de phase ferrite, de 52 à 58 % de phase perlite, de 30 à 35 % de phase bainite avec une limite d'élasticité de 615 à 630 MPa, une résistance à la traction de 850 à 880 MPa.
PCT/TR2022/051237 2021-11-30 2022-11-03 Acier micro-allié à haute résistance et procédé de production associé WO2023101641A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2021018772 2021-11-30
TR2021/018772 TR2021018772A2 (tr) 2021-11-30 Yüksek mukavemetli mikro alaşımlı çelik ve ilgili üretim yöntemi

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WO2023101641A1 true WO2023101641A1 (fr) 2023-06-08

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001030036A (ja) * 1999-07-23 2001-02-06 Nkk Joko Kk 高強度非調質鋼部品およびその製造方法
KR20200136068A (ko) * 2019-05-27 2020-12-07 주식회사 삼원강재 지연파괴 저항성이 향상된 구조 체결용 강재 및 이를 이용한 구조 체결재 제조 방법
WO2021133345A1 (fr) * 2019-12-24 2021-07-01 Ti̇rsan Kardan Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Composition d'acier micro-allié ayant des propriétés mécaniques améliorées

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001030036A (ja) * 1999-07-23 2001-02-06 Nkk Joko Kk 高強度非調質鋼部品およびその製造方法
KR20200136068A (ko) * 2019-05-27 2020-12-07 주식회사 삼원강재 지연파괴 저항성이 향상된 구조 체결용 강재 및 이를 이용한 구조 체결재 제조 방법
WO2021133345A1 (fr) * 2019-12-24 2021-07-01 Ti̇rsan Kardan Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Composition d'acier micro-allié ayant des propriétés mécaniques améliorées

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