WO2022021816A1 - Acier résistant à la chaleur pour tuyau en acier et pièce coulée - Google Patents

Acier résistant à la chaleur pour tuyau en acier et pièce coulée Download PDF

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Publication number
WO2022021816A1
WO2022021816A1 PCT/CN2021/072875 CN2021072875W WO2022021816A1 WO 2022021816 A1 WO2022021816 A1 WO 2022021816A1 CN 2021072875 W CN2021072875 W CN 2021072875W WO 2022021816 A1 WO2022021816 A1 WO 2022021816A1
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Prior art keywords
heat
casting
resistant steel
steel
steel pipe
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PCT/CN2021/072875
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English (en)
Chinese (zh)
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梅林波
孙林根
安春香
王煜
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上海电气电站设备有限公司
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Priority to DE112021001054.9T priority Critical patent/DE112021001054T5/de
Priority to JP2022557133A priority patent/JP7428822B2/ja
Publication of WO2022021816A1 publication Critical patent/WO2022021816A1/fr

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    • 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
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/007—Heat treatment of ferrous alloys containing Co
    • 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
    • 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
    • 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
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/04—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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • 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
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the invention belongs to the technical field of metal materials, and relates to a heat-resistant steel for steel pipes and castings.
  • the boiler in the pressure vessel is an energy conversion device.
  • the energy input to the boiler includes chemical energy and electrical energy in the fuel, and the boiler outputs steam, high-temperature water or organic heat carrier with certain thermal energy.
  • the steam turbine in the power machinery also known as the steam turbine, is a rotary steam power device.
  • the high-temperature and high-pressure steam passes through the fixed nozzle to become an accelerated airflow and then sprays onto the blades, so that the rotor equipped with the blade row rotates and does external work at the same time.
  • Boilers and steam turbines are the main equipment of modern thermal power plants.
  • Improving the steam temperature parameters of thermal power and coal-fired units can improve unit efficiency, reduce fossil fuel consumption, and achieve energy conservation and emission reduction.
  • the operating temperature of boilers and steam turbines is limited by the maximum service temperature of key components such as steel pipes such as boiler pipes, castings such as cylinders and valves in steam turbines.
  • High-temperature materials for boiler pipes, cylinders and valves in steam turbines have been developed from Cr-Mo steel to various 9% to 12% Cr ferritic steels.
  • T92/P92, etc. are currently available for high-temperature materials of existing steel pipes such as boiler pipes;
  • ZG13Cr9Mo2Co1NiVNbNB, etc. are currently available for high-temperature materials of existing castings such as cylinders and valves in steam turbines.
  • the maximum working temperature of these steel grades cannot exceed 630°C, and there is currently no heat-resistant steel for steel pipes and castings that can meet the working temperature of 650°C.
  • the purpose of the present invention is to provide a heat-resistant steel for steel pipes and castings, which can be made into boiler pipes and steam turbine castings, and can meet the requirements of pressure vessels or power machinery zero at 650°C and below. Component usage requirements.
  • a first aspect of the present invention provides a kind of heat-resistant steel for steel pipes and castings, which is composed of the following elements by mass percentage:
  • the impurities are selected from P (phosphorus), S (sulfur), Al (aluminum), Ti (titanium), Zr (zirconium), Cu (copper), Sn (tin), As (arsenic), Sb ( one or more elements of antimony).
  • the mass percentage content of the elements in the impurities meets the following requirements: P: ⁇ 0.020wt%, S: ⁇ 0.010wt%, Al: ⁇ 0.02wt%, Ti: ⁇ 0.02wt%, Zr: ⁇ 0.02wt%, Cu: ⁇ 0.15wt%, Sn: ⁇ 0.02wt%, As: ⁇ 0.02wt%, Sb: ⁇ 0.005wt%.
  • the Cr (chromium) equivalent should be ⁇ 8.5% according to Cr+6Si+4Mo+1.5W+11V+5Nb-40C-2Mn-4Ni-2Co-30N, and all The mass ratio of the B element to the N element is 0.65-2.40:1.
  • the heat-resistant steel for steel pipes and castings is composed of the following elements by mass percentage:
  • the mass percentage content of the elements in the impurities meets the following requirements: P: ⁇ 0.020wt%, S: ⁇ 0.005wt%, Al: ⁇ 0.01wt%, Ti: ⁇ 0.01wt%, Zr: ⁇ 0.01wt% %, Cu: ⁇ 0.10wt%, Sn: ⁇ 0.01wt%, As: ⁇ 0.01wt%, Sb: ⁇ 0.003wt%.
  • the Cr (chromium) equivalent should be ⁇ 8.0% according to Cr+6Si+4Mo+1.5W+11V+5Nb-40C-2Mn-4Ni-2Co-30N, and The mass ratio of the B element to the N element is 0.75-2.10:1.
  • element C ensures hardenability.
  • C combines with other elements to form M23C6 carbides at the grain boundaries and martensitic lath boundaries, and form MX-type carbonitrides inside the martensitic laths, which can improve the high temperature strength.
  • C is also an indispensable element to suppress the formation of harmful phases ⁇ -ferrite and BN.
  • the C content should be limited to 0.08 to 0.14%. Further, the optimum content of element C should be limited to 0.08-0.13%.
  • Si acts as a deoxidizer for molten steel, and works together with Cr to improve the oxidation resistance of the steel.
  • the amount of Si added is too large, the deoxidized product SiO2 will remain in the steel, reducing the purity and toughness of the molten steel.
  • Si also promotes the precipitation of the intermetallic compound Laves phase and reduces the creep plasticity. Si increases temper brittleness when used at high temperatures. Therefore, the Si content should be limited to 0.20 to 0.40%. Further, the optimum content of Si element should be limited to 0.20-0.30%.
  • Mn element can remove oxygen and sulfur elements in molten steel, improve the hardenability and strength of steel, inhibit the formation of ⁇ -ferrite and BN, and promote M23C6 Carbide precipitation. But with the increase of Mn content, the creep rupture strength decreases. Therefore, the content of Mn element should be limited to 0.30-0.60%. Further, the optimum content of Mn element should be limited to 0.40-0.50%.
  • Ni element can increase the hardenability of the steel, inhibit the formation of ⁇ -ferrite and BN, and improve the strength and toughness at room temperature.
  • the addition of Ni element is not conducive to the high temperature creep properties of the steel and increases the temper brittleness of the steel.
  • the addition amount of Ni should be as low as possible, preferably not more than 0.20%, and preferably not more than 0.10%.
  • Cr element can improve oxidation resistance and corrosion resistance, and improve high-temperature strength by precipitating M23C6 carbides.
  • the content of Cr element in the heat-resistant steel of the present invention is at least 9.00%. However, if it exceeds 10.00%, ⁇ -ferrite is easily formed, and the high-strength temperature and toughness are lowered. Therefore, the content of Cr element should be limited to 9.00-10.00%. Further, the optimum content of Cr element should be limited to 9.00-9.60%.
  • the Cr equivalent (Cr+6Si+4Mo+1.5W+11V+5Nb-40C-2Mn-4Ni-2Co-30N) of the heat-resistant steel of the present invention is limited to less than 8.5%, more preferably less than 8.0%. Precipitation of delta-ferrite can be avoided.
  • Mo element can improve the hardenability, suppress temper brittleness, promote the dispersion and precipitation of M23C6 carbides, and improve the tensile strength and creep rupture strength of the steel.
  • excessive Mo element will promote the precipitation of ⁇ -ferrite and intermetallic compound Laves phase, and significantly reduce the toughness. Therefore, the content of Mo element is limited to 0.55 to 0.80%. Further, the optimum content of Mo element should be limited to 0.60-0.75%.
  • W element is very effective in suppressing the coarsening of M23C6 carbides, and its effect exceeds that of Mo element, which can significantly improve the creep rupture strength.
  • the Co element can suppress the precipitation of ⁇ -ferrite while solid solution strengthening.
  • Co element interacts with Mo element and W element, which obviously improves the high temperature strength and improves the toughness of the steel.
  • the content of Co element should not be too high.
  • the content of Co element should be limited to 2.80-3.30%. Further, the optimum content of Co element should be limited to 2.90-3.20%.
  • the V element can improve the tensile strength.
  • fine carbonitrides of the V element are formed inside the martensitic lath to increase the creep rupture strength. Adding a certain amount of V element can refine the grains and improve the toughness. However, if the addition amount is too large, the toughness will be lowered, and the carbon will be fixed excessively, resulting in a decrease in the precipitation amount of M23C6 carbides. Therefore, its content is 0.15 to 0.25%. The expected value should be 0.18-0.25%.
  • Nb element like V element, can improve tensile strength and creep rupture strength.
  • Nb element and C element generate fine NbC, which can refine grains and improve toughness.
  • the MX carbonitride formed by Nb element and V element has the effect of improving high temperature strength, and its minimum content should be 0.03%.
  • carbon is excessively fixed to reduce the precipitation amount of M23C6 carbides, resulting in a decrease in high temperature strength. Therefore, it needs to be limited to 0.03 to 0.08%.
  • the expected value should be 0.04-0.07%.
  • N element can precipitate VN nitride with V element, and the solid solution state is combined with Mo element and W element to improve high temperature strength, and the minimum content should be 0.005%.
  • the addition exceeds 0.015%, the plasticity will be impaired.
  • B element it is easy to form eutectic Fe2B and BN, which damages the creep performance and toughness of steel. Therefore, the N element content is limited to 0.006 to 0.015%. Further, the optimum content of N element should be limited to 0.007-0.014%.
  • element B has the effect of strengthening grain boundaries, has the effect of inhibiting the coarsening of M23C6 carbides, and improves high-temperature strength.
  • the B element content is limited to 0.009 to 0.015%.
  • the optimum content of element B should be limited to 0.010-0.015%.
  • the mass ratio of B element to N element should be controlled to be 0.65-2.40:1, more preferably, 0.75-2.10:1.
  • the above-mentioned unavoidable impurities are inclusion elements that are inevitably contaminated in the steel smelting process.
  • the content of these elements should be as low as possible. If the steelmaking raw materials are strictly screened, the cost will rise. Therefore, the P content should be limited to not higher than 0.020%, the S content to be not higher than 0.010%, and the Cu content to be not higher than 0.15%.
  • other inclusion elements such as Al, Ti, Zr, Sn, As, Sb, etc. have adverse effects on the mechanical properties of this heat-resistant steel, and their content should be reduced as much as possible.
  • the second aspect of the present invention provides a method for preparing a steel pipe.
  • the heat-resistant steel is mixed with raw materials according to the element ratio, and then smelted, and firstly prepared by any one of continuous casting, die casting, hot rolling or hot forging.
  • the tube blank is then made into a steel tube by any one of hot rolling, hot extrusion, hot expansion, cold drawing, cold rolling or forging and boring, and then the steel tube is normalized or quenched and then tempered to obtain .
  • the temperature of the normalizing or quenching is 1070-1160°C.
  • the tempering includes at least one time, and the tempering temperature is 740-790°C.
  • a third aspect of the present invention provides a method for preparing a casting.
  • the heat-resistant steel is mixed with raw materials according to the element ratio, smelted and casted to obtain a casting, and then the casting is normalized or quenched and then tempered.
  • the temperature of the normalizing or quenching is 1070-1160°C.
  • the tempering includes at least one time, and the tempering temperature is 730-780°C.
  • a fourth aspect of the present invention provides the use of the above heat-resistant steel or steel pipe in a pressure vessel.
  • the pressure vessel is a boiler tube.
  • a fifth aspect of the present invention provides the use of the above-mentioned heat-resistant steel or casting in a power machine.
  • the power machine is a steam turbine.
  • the smelting includes alloy smelting and refining processes.
  • the alloy smelting and refining processes in the above-mentioned smelting are all well-known technical processes in the field of steel manufacturing.
  • the heat-resistant steel for steel pipes and castings provided by the present invention can obtain steel pipes and castings with excellent performance through the preferred element components and preparation steps thereof.
  • Co element is added, the ratio of B and N is adjusted, the content of Cr, Mo and B elements is increased, and the content of Nb, N and Ni elements is reduced.
  • the content of Si and W elements has been more strictly limited, and the limit of impurity elements Cu, Sn, As, and Sb has been increased; compared with the existing casting material ZG13Cr9Mo2Co1NiVNbNB, W element has been added, and the ratio of B and N has been adjusted.
  • the contents of Co and B elements are increased, the contents of Mn, Mo, N and Ni elements are decreased, and the limits of impurity elements Ti, Zr, Cu, Sn, As, and Sb are increased.
  • the invention provides a heat-resistant steel for steel pipes and castings, which improves the high-temperature creep rupture strength and oxidation resistance, which will increase the operating temperature, thereby improving the thermal efficiency of the generator set and reducing coal consumption and carbon dioxide emissions.
  • the material grade is abbreviated as TB4 (small-diameter pipe)/PB4 (large-diameter pipe), and the material grade is abbreviated as CB4 when used as a casting material.
  • the heat-resistant steel for steel pipes and castings provided by the present invention can be used to prepare pressure vessels and power machinery, especially boiler pipes and steam turbine castings. It has good high temperature creep rupture strength and oxidation resistance in the environment, and can meet the requirements of boilers and steam turbines with a working temperature of 650 °C and below.
  • each component is composed of the following elements by mass percentage:
  • the mass percentage contents of the elements in the impurities are: P: 0.008wt%, S: 0.003wt%, Al: 0.01wt%, Ti: 0.003wt%, Zr: 0.001wt%, Cu: 0.05wt% , Sn: 0.001wt%, As: 0.001wt%, Sb: 0.001wt%.
  • the Cr equivalent is 7.62%.
  • the mass ratio of B element to N element is 1:1.
  • smelting is carried out, that is, alloy smelting and refining are carried out in sequence, and then die-casting into a tube blank. That is, the steel pipe sample 1# is obtained.
  • the normalizing temperature is 1100°C
  • the tempering includes one time
  • the tempering temperature is 780°C.
  • Steel tube sample 1# is a boiler tube.
  • each component is composed of the following elements by mass percentage:
  • the mass percentage contents of the elements in the impurities are: P: 0.012wt%, S: 0.005wt%, Al: 0.01wt%, Ti: 0.005wt%, Zr: 0.001wt%, Cu: 0.06wt% , Sn: 0.001wt%, As: 0.002wt%, Sb: 0.0015wt%.
  • the Cr equivalent is 6.7%.
  • the mass ratio of B element to N element is 1.4:1.
  • smelting is carried out, that is, alloy smelting and refining are carried out in sequence, and then cast into castings.
  • the castings are normalized and tempered to obtain casting sample 1*.
  • the normalizing temperature is 1140°C
  • the tempering includes 2 times
  • the tempering temperature is 755°C.
  • Casting sample 1* is a steam turbine valve casing casting.
  • Example 1 Example 2 C 0.10 0.12 Si 0.30 0.25 Mn 0.50 0.45 Cr 9.30 9.60
  • Example 1 Example 2 P 0.008 0.012 S 0.003 0.005 Al 0.01 0.01 Ti 0.003 0.005 Zr 0.001 0.001 Cu 0.05 0.06 Sn 0.001 0.001 As 0.001 0.002 Sb 0.001 0.0015
  • the steel pipe sample 1# obtained in Example 1 and the casting sample 1* obtained in Example 2 were tested for creep rupture strength according to the national standard GB/T 2039, and then extrapolated according to the national standard GB/T 2039.
  • the method deduces the creep rupture strength limit R u100000h/650°C at 650°C/100,000 hours, and compares it with the creep rupture strength of T92/P92 and ZG13Cr9Mo2Co1NiVNbNB at 650°C/100,000 hours respectively.
  • the results are as follows shown in Table 4.
  • the samples were placed in a water vapor environment of 620°C/650°C and 27MPa flowing for a maximum time of 2000h, and the weight gain of each sample during this period was tested. The smaller the oxidation weight gain, the better the oxidation resistance of the material.
  • test results show that at the same temperature, the oxidation resistance of steel pipe sample 1# is significantly better than that of T92/P92, and the oxidation resistance of casting sample 1* is significantly better than that of ZG13Cr9Mo2Co1NiVNbNB.
  • the oxidation weight gain of steel pipe sample 1# is similar to that of T92/P92 at 620°C, and the oxidation weight gain of casting sample 1* is similar to that of ZG13Cr9Mo2Co1NiVNbNB at 620°C similar. It shows that the steel pipes and castings prepared from the heat-resistant steel of the present invention can basically meet the needs of long-term use under the working condition of 650°C without using a surface protective coating to resist oxidation.
  • the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

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

Abstract

L'invention concerne un acier résistant à la chaleur pour un tuyau en acier et une pièce coulée, constitué des éléments suivants : 0,08 à 0,14 % en poids de C, 0,20 à 0,40 % en poids de Si, 0,30 à 0,60 % en poids de Mn, 9,00 à 10,00 % en poids de Cr, 2,80 à 3,30 % en poids de Co, 1,65 à 1,90 % en poids de W, 0,55 à 0,80 % en poids de Mo, 0,15 à 0,25 % en poids de V, 0,03 à 0,08 % en poids de Nb, 0,006 à 0,015 % en poids de N, 0,009 à 0,015 % en poids de B, ≤ 0,20 % en poids de Ni, et le reste étant du Fe et des impuretés inévitables. Un procédé de préparation du tuyau en acier comprend les étapes consistant à : pour l'acier résistant à la chaleur, prendre des matières premières selon un rapport d'éléments, mélanger puis faire fondre ; tout d'abord, fabriquer une ébauche de tuyau à l'aide d'une étape quelconque parmi la coulée continue, la coulée sous pression, le laminage à chaud ou le forgeage à chaud ; puis transformer l'ébauche de tuyau en un tuyau en acier à l'aide d'une étape quelconque parmi le laminage à chaud, l'extrusion à chaud, l'expansion à chaud, le tréfilage à froid, le laminage à froid ou l'alésage - forgeage ; puis normaliser ou tremper le tuyau en acier et ensuite soumettre à un revenu pour obtenir un tuyau en acier fini. Un procédé de préparation de la pièce coulée selon la présente invention comprend les étapes consistant à : pour l'acier résistant à la chaleur, prendre des matières premières selon un rapport d'éléments, mélanger puis faire fondre ; couler ensuite pour obtenir une pièce coulée ; puis normaliser ou tremper la pièce coulée et ensuite la soumettre à un revenu pour obtenir une pièce coulée finie.
PCT/CN2021/072875 2020-07-30 2021-01-20 Acier résistant à la chaleur pour tuyau en acier et pièce coulée WO2022021816A1 (fr)

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DE112021001054.9T DE112021001054T5 (de) 2020-07-30 2021-01-20 Hitzebeständiger Stahl für Stahlrohre und Gussteile
JP2022557133A JP7428822B2 (ja) 2020-07-30 2021-01-20 鋼管及び鋳造品用耐熱鋼

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CN114959431A (zh) * 2022-06-02 2022-08-30 邯郸慧桥复合材料科技有限公司 一种大型半自磨机衬板及其制造方法
CN116676470A (zh) * 2023-08-03 2023-09-01 成都先进金属材料产业技术研究院股份有限公司 一种耐热钢无缝钢管及其热处理方法

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CN114959431A (zh) * 2022-06-02 2022-08-30 邯郸慧桥复合材料科技有限公司 一种大型半自磨机衬板及其制造方法
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CN116676470A (zh) * 2023-08-03 2023-09-01 成都先进金属材料产业技术研究院股份有限公司 一种耐热钢无缝钢管及其热处理方法
CN116676470B (zh) * 2023-08-03 2023-12-01 成都先进金属材料产业技术研究院股份有限公司 一种耐热钢无缝钢管及其热处理方法

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