• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    the present invention relates to low alloy steel plate, high strength and high tenacity, and a method for manufacturing the same. the components of low alloy steel plate, high strength and high toughness in % by mass are: c 0.08% to 0.25%; si 0.10% to 1.00%; min 0.50% to 2.00%; p<0.020%; s<0.010%; cr 0.10% to 2.00%; mo 0% to 1.00%; ni 0% to 2.00%; nb 0.010% to 0.080%; v = 0.10%; ti = 0.060%; b 0.0005% to 0.0040%; al 0.010% to 0.080%; ca 0.010% to 0.080%; n = 0.0080%; o=0.0080%; h = 0.0004%, and the balance of fe and unavoidable impurities, with the above elements needing to meet: 0.20% = (cr/5 + mn/6 + 50b) = 0.55%, 0.02% = (mo/3 + ni/5 + 2nb) = 0.45%, and 0.01% = (al + ti) = 0.13%. the steel plate has a brinell hardness of 390 hb to 460 hb, a yield strength of 900 mpa to 1100 mpa, a tensile strength of 1100 mpa to 1400 mpa, an elongation rate of 11% to 15%, an energy of charpy notch longitudinal impact va -40°c of = 40 j, and a plate thickness of up to 100 mm or greater, and has good mechanical processing properties.
    公开号:BR112017010908B1
    申请号:R112017010908-5
    申请日:2015-11-04
    公开日:2021-07-06
    发明作者:Xiangqian Yuan；Hongbin Li；Sihai Jiao；Liandeng Yao
    申请人:Baoshan Iron & Steel Co., Ltd；
    IPC主号:
    专利说明:

    Technical Field
    [0001] The present invention belongs to the field of metallurgical technology, and particularly refers to a low alloy steel plate, high strength and high tenacity, and a method to manufacture the same. Background of the Technique
    [0002] Mechanical devices for engineering, mining, metallurgy and the like, such as parts of earthmoving machines, excavators, scraper conveyor, etc., commonly require steel plates with a high strength, a high hardness, a high tenacity and others characteristics. Furthermore, large crushers and large excavators and other special devices require steel plates that have a great thickness, and the thickness can be up to 100 mm or more. For industrialized production, generally a continuous casting method is used to produce a continuous cast sheet, and then a rolling method is performed to obtain a steel plate with a certain thickness, where the thickness of the continuous cast sheet is usually 200-300 mm, the thick steel plate, high strength, high hardness thus produced, often has a core quality that is difficult to guarantee, and it is difficult to fully meet the needs of the working conditions; for the production of a foundry using a casting method, there are defects of a high alloy content, an inferior internal quality, being easy to crack during use, etc., which significantly reduces the lifetime of the product; and for production using a die casting method, although a large thickness steel plate can be produced, there are defects from a long production procedure, a low finish product rate, a high cost production etc., which they are disadvantageous for the market promotion of the product.
    [0003] Chinese patent CN 1140205 A describes a medium-to-high carbon steel, medium alloy, wear resistant, produced using a casting process, and the contents of carbon and alloying elements (Cr, Mo and the like) are higher, which inevitably results in inferior welding properties and inferior mechanical processing properties, as well as a short service life. Invention Summary
    [0004] It is an objective of the present invention to provide a low alloy, high strength and high tenacity steel plate, and a method for manufacturing the same, the mechanical properties of the high strength, high tenacity steel plate are: a hardness of Brinell from 390 HB to 460 HB, a yield strength of 900 MPa to 1100 MPa, a tensile strength of 1100 MPa to 1400 MPa, an elongation ratio of 11% to 15%, a notch longitudinal impact energy of Charpy V at -40°C from > 40 J, and a plate thickness of up to 100 mm or greater. The microstructure of steel is martensite + residual austenite, or martensite + bainite + residual austenite, and steel realizes a combination of high strength, high hardness and high toughness, has good mechanical processing properties, and is beneficial for a wide range of applications. range of engineering applications.
    [0005] In order to accomplish the above mentioned objective, the technical solution of the present invention is:
    [0006] a low alloy steel plate, high strength and high tenacity, with the chemical components in percentage by mass being: C: 0.08-0.25%; Si: 0.10-1.00%; Mn: 0.50-2.00%; P: < 0.020%; S: < 0.010%; Cr: 0.10-2.00%; Mo: 0-1.00%; Ni: 0-2.00%; Nb: 0.010-0.080%; V: > 0.10%; Ti: >0.060%; B: 0.0005-0.0040%; Al: 0.010-0.080%; Ca: 0.010-0.080%; N: >0.0080%; O: >0.0080%; H: >0.0004%; and the equilibrium being Fe and unavoidable impurities, and at the same time, the above elements satisfying the following relationships: 0.20% < (Cr/5+Mn/6+50B) < 0.55%, 0.02% < (Mo/3+Ni/5+2Nb) < 0.45% and 0.01% < (Al+Ti) < 0.13%.
    [0007] Additionally, the low alloy steel plate, high strength and high tenacity of the present invention, has a Brinell hardness of 390 HB to 460 HB, a yield strength of 900 MPa to 1100 MPa, a tensile strength of 1100 MPa at 1400 MPa, an elongation ratio of 11% to 15%, a Charpy V notch longitudinal impact energy at -40°C of > 40 J, and a plate thickness of up to 100 mm or greater.
    [0008] Furthermore, the microstructure of the low alloy steel plate, high strength and high toughness of the present invention, is martensite + residual austenite or martensite + bainite + residual austenite.
    [0009] In the design of the steel composition of the present invention, the functions of the main chemical elements are as follows:
    [00010] Carbon: Carbon is the most basic and most important element in steel, and the element enhances strength, hardness and wear resistance through solid solution reinforcement and precipitation reinforcement. An excessively high carbon content is detrimental to the toughness and weldability of steel; and an excessively low carbon content reduces the mechanical properties and wear resistance of steel. In this way, the carbon content is controlled at 0.08-0.25%.
    [00011] Silicon: Silicon is a useful deoxidizing additive in a steel, it can form calcium aluminosilicate inclusions, easily floating upstream, along with calcium and aluminum in the steel, improving the steel's purity. Silicon is subjected to solid solution in ferrite and austenite to improve its hardness and strength, but excessive silicon can result in markedly decreasing the toughness of the steel. In this way, the silicon content is controlled at 0.10-1.00%.
    [00012] Manganese: Manganese improves the hardening ability of a steel; however, when the manganese content is higher, there is a tendency to roughen the grain, easily leading to segregation and cracks appearing in the foundry sheet. In this way, the manganese content is controlled to 0.502.00%.
    [00013] Chromium: Chromium can improve the hardening ability of a steel, and improve the strength and hardness of steel. Chromium can prevent or decrease carbide precipitation and aggregation during preparation, which can improve the stability of the steel preparation. In this way, the chromium content is controlled at 0.10-2.00%.
    [00014] Molybdenum: Molybdenum can refine grains, and improve strength and toughness. Molybdenum is an element that reduces the brittleness of the preparation, and can improve the stability of the preparation. However, an excessively high molybdenum content can substantially increase the cost. In this way, the molybdenum content is controlled at 0-1.00%.
    [00015] Nickel: Nickel has a significant effect, reducing the cold brittleness transition temperature; however, an excessively high content easily causes difficulty in peeling on the surface of the steel plate and the cost is increased significantly. In this way, the nickel content is controlled at 0-2.00%.
    [00016] Niobium: Niobium increases the strength and toughness of a steel through the refinement of grains. In this way, the niobium content is controlled at 0.010-0.080%.
    [00017] Vanadium: The addition of vanadium is mainly to refine the grains, so as to allow the austenite grains not to grow to thicken in the steel plate, in the heated state, so that in a multi-pass lamination process Subsequently, the steel grains are further refined, thereby improving the strength and toughness of the steel. In this way, the vanadium content is > 0.10%.
    [00018] Titanium: Titanium is one of the strongest carbide forming elements, and forms fine TiC particles with carbon. TiC particles are small and distributed at the grain boundary, to achieve a grain refinement effect, the harder TiC particles improve the wear resistance of steel. However, an excessively high titanium content can reduce the toughness of the steel. Thus, the titanium content is > 0.060%.
    [00019] Boron: Boron increases the hardness of a steel; however, an excessively high content will lead to a lack of heat phenomenon, affecting the weldability and practicality of the steel. In this way, the boron content is controlled at 0.0005-0.0040%.
    [00020] Aluminum: Aluminum can refine the grains of a steel, immobilize nitrogen and oxygen in the steel, and reduce the sensitivity of steel to a notch. In this way, the aluminum content is controlled at 0.010-0.080%.
    [00021] Calcium: Calcium has a significant effect on the modification of inclusions in the foundry steel, and the addition of an appropriate amount of calcium in the foundry steel can convert prolonged sulfite inclusions in the foundry steel, to CaS or (Ca) inclusions Spherical , Mn)S, in which the oxide and sulfite inclusions formed with calcium have small densities and tend to flow and be removed. In this way, the calcium content is controlled at 0.010-0.080%.
    [00022] Phosphorus and sulfur: In wear resistant steels, sulfur and phosphorus are both harmful elements, and their contents must be strictly controlled. Thus, the phosphorus content is >0.020% by weight, and the sulfur content is >0.010% by weight.
    [00023] Nitrogen, oxygen and hydrogen: Excessive nitrogen, oxygen and hydrogen in steel are very unfavorable for the properties, especially weldability, impact toughness and crack resistance of steel, and reduce the quality and service life of steel; however, excessively tight control will substantially increase production. Thus, the nitrogen content is >0.0080%, the oxygen content is >0.0080%, and the hydrogen content is >0.0004%.
    [00024] The present invention is controlled to have 0.010% > Al + Ti > 0.13%: titanium can form fine particles, thereby refining the grains, and aluminum can ensure the formation of fine titanium particles, and give full performance for the role of titanium in grain refinement; for this reason, the aluminum and titanium contents must meet the following ratios: 0.010% > Al + Ti > 0.13%.
    [00025] The present invention is controlled to have 0.20% > (Cr/5 + Mn/6 + 50B) > 0.55%: in the present invention, chromium, manganese and boron mainly improve the hardening capacity of the steel, but the effect of each element on the hardenability of steel is different. Thus, in the present invention, "Cr/5 + Mn/6 + 50B" is expressed as an equivalent affecting the hardenability of steel, and with that equivalent, the content and proportion of each alloying element are reasonably controlled, in order to achieve the best effect: not reducing the hardenability of steel due to a lower content, nor having an excessively large amount of surplus due to an excessively high content, which results in a waste of the alloy element, reduces the toughness, weldability, etc., of steel.
    [00026] The present invention is controlled to have 0.02% > (Mo/3 + Ni/5 + 2Nb) > 0.45%: in the present invention, molybdenum, nickel and niobium mainly improve the hardening of steel, but the effect of each element on steel is different. Thus, in the present invention, "Mo/3 + Ni/5 + 2Nb" is expressed as an equivalent affecting the hardening of steel, and with that equivalent, the content and proportion of each alloying element are reasonably controlled in a reasonable manner. to achieve the best effect: not reducing the hardening of the steel due to a lower content, nor having an excessively large amount of surplus due to an excessively high content, which results in a waste of the alloying element, a substantial increase in cost alloy steel, to a reduction in the melting capacity of steel, etc.
    [00027] The method for manufacturing the low alloy, high strength and high tenacity steel plate of the present invention specifically comprises the following steps: (1) Ore reduction and smelting performing ore reduction and smelting, based on the following ingredients to form a continuous casting sheet, the low alloy, high strength, high tenacity steel plate having the following chemical components with mass percentage: C: 0.08-0.25%; Si: 0.10-1.00%; Mn: 0.50-2.00%; P: < 0.020%; S: < 0.010%; Cr: 0.10-2.00%; Mo: 0-1.00%; Ni: 0-2.00%; Nb: 0.010-0.080%; V: > 0.10%; Ti: >0.060%; B: 0.0005-0.0040%; Al: 0.010-0.080%; Ca: 0.010-0.080%; N: >0.0080%; O: >0.0080%; H: >0.0004%; and the equilibrium being Fe and unavoidable impurities, and at the same time, the above elements needing to meet the following ratios: 0.20% < (Cr/5 + Mn/6 + 50B) < 0.55%, 0.02% < (Mo/3 + Ni/5 + 2Nb) < 0.45%, and 0.01% < (Al + Ti) < 0.13%. (2) Compositing by subjecting a surface to be composed of continuous cast sheet, for cleaning the surface iron oxide crust, using a mechanical method, and then subjecting the four edges of the surface to be composite, of the continuous cast sheet, to bevel processing; and superimposing 2 or more continuous cast sheets, and subjecting the surface and adjacent of the continuous cast sheets to peripheral and vacuum welding closure to obtain a composite sheet sheet; (3) Heating and laminating the composite board sheet by heating the composite board sheet to a temperature of 1000-1250°C and keep at the temperature for 1-5 hour; and subjecting the composite plate sheet to a composite lamination, where the lamination starting temperature is 1000-1150°C, and the lamination finishing temperature is 780-980°C. (4) Cooling connected ones after lamination, performing direct water cooling at a temperature between room temperature and 450°C.
    [00028] Or (4) Heat treatment After lamination of the composite plate sheet, performing direct air cooling at room temperature, followed by delineating extinguishing and preparing heat treatments, in which the extinguishing temperature is 850-950° C, and the waiting time, after the core portion of the steel plate reaches the temperature, is 10-90 minutes; and the preparation temperature is 100-450°C, and the waiting time after the core portion of the steel plate reaches the temperature, is 30-120 minutes.
    [00029] Additionally, a continuous casting process is used for said casting in step (1), at a continuous casting stretching speed of > 1.0 m/minute.
    [00030] The effects of the manufacturing process of the present invention are as follows: the present invention guarantees a continuous casting removal rate of > 1.0 M/minute, and the effects of a uniform composition within the casting sheet, and a good surface quality are carried out.
    [00031] Composite: Mechanical processing and the closing and vacuuming of the weld on the plate are the basis of smooth rolling, and if the composite is not suitable, the mechanical properties of the steel will be reduced, the service life of the steel will be decreased, and even a sheet cracking phenomenon can occur in the lamination process.
    [00032] Plate heating: Plate heating temperature and waiting time are important prerequisites to ensure smooth rolling of the plate, and should be strictly controlled. The heating temperature for the continuous cast sheet, or the initial laminating sheet, is controlled between 1000°C and 1250°C, and the waiting time is between one hour and 5 hours: In the case of ensuring that the grains austenite does not grow, a uniform austenitized structure is obtained, and particularly the cross-section of the composite performs a metallurgical combination, smooth rolling is guaranteed, the mechanical properties of steel are guaranteed and cracking of the steel plate is prevented.
    [00033] Sheet rolling and connected coolant: The rolling temperature and coolant temperature are important parameters to guarantee the structure and properties of the steel plate. In the step, when the starting temperature of the lamination is controlled at 1000-1150°C, and the finish lamination temperature is controlled at 780-980°C, the deformed austenite can be easily homogenized, and after the lamination, the plate The steel plate is directly water-cooled to obtain a uniform structure, ensuring uniform thickness of the steel plate.
    [00034] Outline quenching and preparation: If outline quenching and preparation heating treatment is used for the steel plate, the heating treatment temperature and maintenance time are needed to be strictly controlled in order to guarantee the properties of the steel plate. In the step, the preparation temperature is 800-950°C, and the waiting time, after the core portion of the steel plate reaches the temperature, is 10-90 minutes; and the preparation temperature is 100-450°C, and the waiting time, after the core portion of the steel plate reaches the temperature, is 30-120 minutes.
    [00035] After detecting, the mechanical properties of the low alloy, high strength and high toughness steel plate of the present invention are as follows: a Brinell hardness of 390 HB to 460 HB, a yield strength of 900 MPa at 1100 MPa, a tensile strength of 1100 MPa at 1400 MPa, an elongation ratio of 11% to 15%, a Charpy V notch longitudinal impact energy at -40°C of > 40 J, and a plate thickness up to 100 mm or more. The microstructure of the steel of the present invention is martensite and residual austenite, or martensite, bainite and residual austenite. It can be seen that the steel plate obtained by controlling carbon, and alloying element contents and various heat treatment processes in the present invention have a low cost, a simple process, a high hardness, a low low temperature hardening, excellent mechanical processing properties, and easy weldability, and it is suitable for easy wear parts in various mechanical devices, particularly large thickness devices.
    [00036] The present invention has the following beneficial effects: 1) in relation to the chemical composition, the present invention is mainly low carbon and low alloy, making full use of the refinement, strength and similar characteristics of microalloy elements such as Cr, Mo, Nb and Ti, in order to ensure the steel plate has good mechanical properties, excellent weldability etc. 2) In the production process, the present invention uses two/more sheets for assembling the composition sheet, thereby solving a thick dimension sheet supply problem. After compounding, the composite sheet has a thickness increased by one or more times on the basis of the original single continuous casting, and after the increase in sheet thickness, the thickness of a sheet product is also increased. By controlling the starting temperature of the lamination, ending the lamination temperature, cooling temperature and other process parameters, in the TMCP process, the structure of refinement and resistance effects on the product are increased, thereby reducing the elements of carbon and alloy, so that a steel plate with excellent mechanical properties, welding performance etc. is obtained. What's more, the process still has the characteristics of short production flow, high efficiency, being energy saving, low cost and the like. 3) In the production process, delineating the quenching + preparation process can also be used for the present invention, where a large thickness, wear-resistant steel plate can be obtained through a reasonable combination of quench temperature and quench time , temperature and preparation time, and other parameters. The product involved in the invention is reasonable in the production process, has wider ranges of process parameters, and is suitable for industrial production. 4) In production descriptive reports, a composite lamination method is used in the invention, a wear resistant large thickness steel plate, excellent in quality, can be produced, and the thickness can be up to 100mm or more, meeting the requirements of large grinders and large excavators and other special devices for thick steel plates. 5) In terms of product performance, the low alloy, high strength and high toughness steel plate of the present invention has a Brinell hardness of 390 HB to 460 HB, a yield strength of 900 MPa to 1100 MPa, a tensile strength from 1100 MPa to 1400 MPa, an elongation ratio of 11% to 15%, a Charpy V notch longitudinal impact energy at -40°C of > 40 J, and a plate thickness of up to 100 mm or more , thereby having advantages such as high strength, high hardness, high hardening at low temperature, as well as good weldability. 6) In terms of microscopic structure, the low alloy steel plate, high strength and high toughness of the present invention makes full use of alloying elements addition and lamination, and cooling control processes to obtain fine and uniform martensite + residual austenite, or martensite + bainite + residual austenite, which benefit a good combination of strength, hardness and hardening of the steel plate. Description of Drawings
    [00037] Figure 1 is a metallographic photograph of the matrix structure, of a steel plate of Example 4 of the present invention.
    [00038] Figure 2 is a metallographic photograph of the composite interface structure of the steel plate of Example 4 of the present invention. Particular Modalities
    [00039] The present invention is further illustrated below together with examples.
    [00040] Table 1 is the chemical components of steel plates from Examples 1-6 and Comparative Example 1, the specific process parameters are as shown in Table 2, and the mechanical properties are as shown in Table 3.
    [00041] The method for manufacturing the steel plates of Examples 1-6 and Comparative Example 1 (Comparative Example 1 being Example 2 in Patent No. CN 1865481 A) is: the corresponding ore reduction raw materials are subjected, successively, to the following steps: reduction of

    [00042] From Table 3 it can be seen that the steel plate of the present invention has a Brinell hardness of 390 HB to 460 HB, a yield strength of 900 MPa to 1100 MPa, a tensile strength of 1100 MPa to 1400 MPa, an elongation ratio of 11% to 15%, and a Charpy V notch longitudinal impact energy at -40°C of > 40 J. It is indicated thereafter that the steel plate of the present invention has the features high strength, high hardness and high hardening, and has excellent compressor performance, particularly superior to the mechanical properties of the steel plate in Comparative Example 1.
    [00043] Figures 1 and 2, respectively, provide the metallographic photographs of the matrix structure, in a composite interface of the steel plate of Example 4, of the present invention. And it can be seen that, after composite lamination and direct cooling after lamination, the two sheets are well matched, without defects such as mismatch, cracking etc., so the mechanical properties and length of service life of the board steel can be guaranteed.



    权利要求:
    Claims (8)
    [0001]
    1. Low alloy steel plate, high strength and high toughness, featuring a plate thickness of up to 80 mm or more, characterized by the fact that the components with mass percentage are: C: 0.08-0.25% ; Si: 0.10-1.00%; Mn: 0.50-2.00%; P: < 0.020%; S: < 0.010%; Cr: 0.10-2.00%; Mo: 0-1.00%; Ni: 0-2.00%; Nb: 0.010-0.080%; V: > 0.10%; Ti: >0.060%; B: 0.0005-0.0040%; Al: 0.010-0.080%; Ca: 0.010-0.080%; N: >0.0080%; O: >0.0080%; H: >0.0004%; the equilibrium being Fe and unavoidable impurities, and at the same time, the above elements satisfying the following ratios: 0.20% < (Cr/5 + Mn/6 + 50B) < 0.55%, 0.02% < ( Mo/3 + Ni/5 + 2Nb) < 0.45%, and 0.01% < (Al + Ti) < 0.13%.
    [0002]
    2. Low alloy, high strength and high tenacity steel plate, according to claim 1, characterized in that said low alloy, high strength and high tenacity steel plate has a Brinell hardness of 390 HB to 460 HB, a yield strength of 900 MPa to 1100 MPa, a tensile strength of 1100 MPa to 1400 MPa, an elongation ratio of 11% to 15%, and a Charpy V notch longitudinal impact energy at -40°C of > 40 J.
    [0003]
    3. Low alloy, high strength and high tenacity steel plate, according to claim 1 or 2, characterized in that the microstructure of said low alloy, high strength and high tenacity steel plate is martensite + residual austenite or martensite + bainite + residual austenite.
    [0004]
    4. Method for manufacturing a low-alloy, high strength and high toughness steel plate, having a plate thickness of up to 80 mm or greater, characterized by the fact that it comprises the following steps: (1) Ore reduction and Casting perform ore reduction and smelting based on the following ingredients, to form a continuous casting sheet, the chemical components of low alloy steel plate, high strength and high toughness in percentage by mass being: C: 0.08- 0.25%; Si: 0.10-1.00%; Mn: 0.50-2.00%; P: < 0.020%; S: < 0.010%; Cr: 0.102.00%; Mo: 0-1.00%; Ni: 0-2.00%; Nb: 0.010-0.080%; V: > 0.10%; Ti: >0.060%; B: 0.0005-0.0040%; Al: 0.010-0.080%; Ca: 0.010-0.080%; N: >0.0080%; O: >0.0080%; H: >0.0004%; and the equilibrium being Fe and unavoidable impurities, and at the same time, the above elements satisfying the following relationships: 0.20% < (Cr/5 + Mn/6 + 50B) < 0.55%, 0.02% < (Mo/3 + Ni/5 + 2Nb) < 0.45%, and 0.01% < (Al + Ti) < 0.13%; (2) Composition subjecting a surface to be composed of continuous cast sheet, for cleaning the surface iron oxide crust, using a mechanical method, and then subjecting the four edges of the surface to be composed of continuous cast sheet to a bevelling processing; superimposing 2 or more continuous cast plates, and subjecting the adjacent surface of the continuous cast plates to peripheral and vacuum welding closure to obtain a composite plate plate; (3) Heating and laminating the composite plate sheet heat the composite plate sheet to a temperature of 1000-1250°C, and keep at the temperature for 1-5 hours; and subjecting the composite plate sheet to a composite lamination, wherein the lamination starting temperature is 1000-1150°C, and the lamination finishing temperature is 780-980°C; and (4) Connected Cooling after laminating, perform direct water cooling to a temperature between room temperature and 450°C.
    [0005]
    5. Method for fabricating a low-alloy, high-strength, high-tenacity steel plate having a plate thickness of up to 80 mm or greater, characterized by the fact that it comprises the following steps: (1) Ore Reduction and Casting perform ore reduction and smelting, based on the following ingredients, to form a continuous casting sheet, the chemical components of the low-alloy, high-strength, high-tenacity steel plate, by mass percentage being: C: 0.08 -0.25%; Si: 0.10-1.00%; Mn: 0.50-2.00%; P: < 0.020%; S: < 0.010%; Cr: 0.102.00%; Mo: 0-1.00%; Ni: 0-2.00%; Nb: 0.010-0.080%; V: > 0.10%; Ti: >0.060%; B: 0.0005-0.0040%; Al: 0.010-0.080%; Ca: 0.010-0.080%; N: >0.0080%; O: >0.0080%; H: >0.0004%; and the equilibrium being Fe and unavoidable impurities, and at the same time, the above elements satisfying the following relationships: 0.20% < (Cr/5 + Mn/6 + 50B) < 0.55%, 0.02% < (Mo/3 + Ni/5 + 2Nb) < 0.45%, and 0.01% < (Al + Ti) < 0.13%; (2) Composition subjecting a surface to be composed of the continuous cast sheet, to a surface iron oxide crust cleaning, using a mechanical method, and then subjecting the four surface edges to be composed of the continuous cast sheet, to bevelling processing; and superimposing 2 or more continuous cast sheets, and subjecting the adjacent surface of the continuous cast sheets to closure and vacuum to obtain a composite sheet sheet; (3) Heating and laminating the composite plate sheet heat the composite plate sheet to a temperature of 1000-1250°C and keep at the temperature for 1-5 hours; and subjecting the composite plate sheet to a composite lamination, wherein the rolling start temperature is 1000-1150°C and the rolling finish temperature is 780-980°C; and (4) Heat treatment after laminating, performing direct air cooling at room temperature, followed by outlining the quenching and heat preparation treatments, where the quench temperature is 850-950°C, and the waiting time after the core portion of the steel plate reaches the temperature is 10-90 minutes; and the preparation temperature is 100-450°C, and the waiting time after the core portion of the steel plate reaches the temperature is 30-120 minutes.
    [0006]
    6. Method for manufacturing low alloy, high strength and high tenacity steel plate according to claim 4 or 5, characterized in that a continuous casting process is used for said casting in step (1), in a continuous casting stretching speed of > 1.0 m/min.
    [0007]
    7. Method for manufacturing low alloy, high strength and high tenacity steel plate, according to any one of claims 4 to 6, characterized in that said low alloy, high strength and high tenacity steel plate has a Brinell hardness of 390 HB to 460 HB, a yield strength of 900 MPa to 1100 MPa, a tensile strength of 1100 MPa to 1400 MPa, an elongation ratio of 11% to 15%, and a longitudinal impact energy of Charpy V notch at -40°C from > 40 J.
    [0008]
    8. Method for manufacturing low-alloy, high-strength and high-tenacity steel plate, according to claim 7, characterized in that the microstructure of said low-alloy, high-strength, high-tenacity steel plate is martensite + residual austenite or martensite + bainite + residual austenite.
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    同族专利:
    公开号 | 公开日
    EP3225710B1|2021-08-18|
    EP3225710A1|2017-10-04|
    AU2015353251A1|2017-06-15|
    EP3225710A4|2018-05-09|
    ES2887082T3|2021-12-21|
    AU2015353251B2|2020-12-24|
    BR112017010908A2|2017-12-26|
    CN104480406A|2015-04-01|
    WO2016082669A1|2016-06-02|
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    法律状态:
    2019-10-01| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-04-27| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-06| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/11/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    CN201410707715.0A|CN104480406A|2014-11-28|2014-11-28|Low-alloy high-strength high-toughness steel plate and manufacturing method thereof|
    CN201410707715.0|2014-11-28|
    PCT/CN2015/093744|WO2016082669A1|2014-11-28|2015-11-04|Low-alloy high-strength high-tenacity steel panel and method for manufacturing same|
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