WO2023179059A1 - Acier 9ni et son procédé de production - Google Patents

Acier 9ni et son procédé de production Download PDF

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WO2023179059A1
WO2023179059A1 PCT/CN2022/132291 CN2022132291W WO2023179059A1 WO 2023179059 A1 WO2023179059 A1 WO 2023179059A1 CN 2022132291 W CN2022132291 W CN 2022132291W WO 2023179059 A1 WO2023179059 A1 WO 2023179059A1
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residual
steel
heating
temperature
sent
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PCT/CN2022/132291
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Chinese (zh)
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谯明亮
吴俊平
翟冬雨
刘心阳
杨柳
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南京钢铁股份有限公司
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/04—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to the technical field of steel production, and in particular to a 9Ni steel and a production method thereof.
  • Nickel-based steel has high alloy content and excellent product quality.
  • 9Ni steel is container steel with a nickel content of 9%. , how to reduce the manufacturing cost of 9Ni steel is a key step for enterprises to obtain a good market competitive advantage.
  • the present invention aims at the above technical problems, overcomes the shortcomings of the existing technology, and provides a 9Ni steel, the chemical composition and mass percentage of which are as follows: C: 0.030% ⁇ 0.060%, Si: 0.10% ⁇ 0.30%, Mn: 0.50% ⁇ 0.80%, P ⁇ 0.005%, S ⁇ 0.002%, residual Nb ⁇ 0.0050%, residual V ⁇ 0.003%, residual Ti ⁇ 0.005%, Ni: 8.50% ⁇ 9.50%, Cr ⁇ 0.05%, Mo ⁇ 0.05%, Cu ⁇ 0.050%, Al: 0.020% ⁇ 0.050%, B ⁇ 0.0005%, Mg: 0.0008% ⁇ 0.0020%, N ⁇ 0.0060%, H ⁇ 0.0002%, the balance is Fe and inevitable impurities.
  • the chemical composition and mass percentage of the aforementioned 9Ni steel are as follows: C: 0.030% ⁇ 0.050%, Si: 0.10% ⁇ 0.20%, Mn: 0.50% ⁇ 0.70%, P ⁇ 0.005%, S ⁇ 0.002 %, residual Nb ⁇ 0.0050%, residual V ⁇ 0.003%, residual Ti ⁇ 0.005%, Ni: 8.50% ⁇ 9.30%, Cr ⁇ 0.05%, Mo ⁇ 0.05%, Cu ⁇ 0.050%, Al: 0.020% ⁇ 0.040% , B ⁇ 0.0005%, Mg: 0.0008% ⁇ 0.0018%, N ⁇ 0.0060%, H ⁇ 0.0002%, the balance is Fe and inevitable impurities.
  • the chemical composition and mass percentage of the aforementioned 9Ni steel are as follows: C: 0.035% ⁇ 0.055%, Si: 0.15% ⁇ 0.25%, Mn: 0.55% ⁇ 0.75%, P ⁇ 0.005%, S ⁇ 0.002 %, residual Nb ⁇ 0.0050%, residual V ⁇ 0.003%, residual Ti ⁇ 0.005%, Ni: 8.80% ⁇ 9.30%, Cr ⁇ 0.05%, Mo ⁇ 0.05%, Cu ⁇ 0.050%, Al: 0.025% ⁇ 0.045% , B ⁇ 0.0005%, Mg: 0.0010% ⁇ 0.0018%, N ⁇ 0.0060%, H ⁇ 0.0002%, the balance is Fe and inevitable impurities.
  • the chemical composition and mass percentage of the aforementioned 9Ni steel are as follows: C: 0.040% ⁇ 0.060%, Si: 0.20% ⁇ 0.30%, Mn: 0.60% ⁇ 0.80%, P ⁇ 0.005%, S ⁇ 0.002 %, residual Nb ⁇ 0.0050%, residual V ⁇ 0.003%, residual Ti ⁇ 0.005%, Ni: 8.80% ⁇ 9.50%, Cr ⁇ 0.05%, Mo ⁇ 0.05%, Cu ⁇ 0.050%, Al: 0.025% ⁇ 0.050% , B ⁇ 0.0005%, Mg: 0.0010% ⁇ 0.0020%, N ⁇ 0.0060%, H ⁇ 0.0002%, the balance is Fe and inevitable impurities.
  • Another object of the present invention is to provide a 9Ni steel, which includes the following steps:
  • the molten steel is sent to refining for deoxidation, alloying and desulfurization. After the composition temperature is consistent, it is sent to RH for vacuum treatment.
  • the vacuum degree is ⁇ 3.0mbar.
  • the vacuum holding time is 20 to 25 minutes. After vacuum treatment, 200 to 220 meters of magnesium and aluminum are simmered. Wire;
  • the cast billet is processed and sent to the heating furnace for heating.
  • the heating process of the heating furnace is: heating to 600°C at a heating speed of 10 ⁇ 15°C/min, heating to 600 ⁇ 1000°C at a heating speed of 5 ⁇ 7°C/min, and heating to 600 ⁇ 1000°C at a heating speed of 2 °C/min Heating to 1000 ⁇ 1100°C, holding at 1100°C for 20 minutes and then exiting the heating furnace;
  • the second opening temperature is 800 ⁇ 950°C
  • the final rolling temperature is 800 ⁇ 900°C
  • the red return temperature is 400 ⁇ 600°C
  • the grinding depth in step S3 is 1 to 2 mm, and the spraying thickness is 0.1 to 0.3 mm.
  • the present invention has studied the factors affecting the surface quality of steel types, carried out corresponding development and applications, and solved the problem of steel types through a series of process improvements such as smelting, rolling and heat treatment.
  • the technological problem of intergranular cracks has been solved, and the advantages of batch smelting and manufacturing of steel grades have been obtained.
  • the manufacturing stability has been greatly improved, the manufacturing cost has been greatly reduced, and the market competitiveness of the product has been effectively improved;
  • magnesium metallurgical technology is used to improve the morphology of inclusions, improve the cleanliness of the product, and avoid the occurrence of intergranular cracks caused by the accumulation of inclusions on the surface;
  • a unique anti-oxidation coating is used for spraying, which avoids secondary oxidation of the cast slab during the heating process, reduces the generation of oxide scale on the surface of the cast slab during the rolling process, and improves the surface quality of the rolled steel plate.
  • the phase change temperature of high nickel steel in the present invention is 570°C, and the end temperature is 730°C.
  • the present invention uses different heating rates to perform heating process quality, reduces linear expansion and thermal conductivity, and avoids the phase change stress caused by the heating process. The occurrence of intergranular cracks;
  • the low-temperature heat treatment process used in the present invention can effectively avoid the trend of intergranular oxidation cracks during the rolling process, avoid the occurrence of intergranular cracks during the austenitization process due to widening, and effectively reduce the batch cracks of quenched and tempered steel plates. incidence;
  • the nickel-molybdenum alloy is added to the converter in the form of scrap steel without affecting the calorific value.
  • the addition of the nickel-molybdenum alloy effectively reduces the solidification of molten steel, meets the requirements for low-temperature tapping, and is conducive to the removal of carbon and phosphorus elements. , which increases the smelting speed.
  • Figure 1 is a metallographic structure diagram of Example 1.
  • the chemical composition and mass percentage of a 9Ni steel provided in this embodiment are as follows: C: 0.039%, Si: 0.17%, Mn: 0.67%, P: 0.004%, S: 0.0011%, Nb: 0.0030% (residual ), V: 0.001% (residual), Ti: 0.002% (residual), Ni: 8.93%, Cr: 0.02%, Mo: 0.03%, Cu: 0.020%, Al: 0.034%, B: 0.0003%, Mg: 0.0013%, N: 0.0046%, H: 0.00016%, the balance is Fe and inevitable impurities.
  • the preparation method includes the following steps:
  • the molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the composition temperature is consistent, it is sent to RH for vacuum treatment. The vacuum degree is ⁇ 3.0mbar. The vacuum holding time is 23 minutes. After vacuum treatment, 210 meters of magnesium aluminum wire is simmered;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 0.9m/min, the superheat degree is 29°C, and electromagnetic stirring and dynamic light reduction processes are used.
  • the slab After the slab is out of continuous casting, it is cooled in an insulation pit for 48 hours. Carry out surface inspection. After the cast billet passes the surface inspection, it will be mechanically ground with a grinding depth of 1.3mm. After grinding, the cast billet will be sprayed with high-temperature antioxidant paint with a spray thickness of 0.16mm;
  • the cast billet is processed and sent to the heating furnace for heating.
  • the heating process of the heating furnace is: heating to 600°C at a heating speed of 12°C/min, heating to 600 ⁇ 1000°C at a heating speed of 5.6°C/min, and heating to 600 ⁇ 1000°C at a heating speed of 2°C/min. to 1000 ⁇ 1100°C, keep at 1100°C for 20 minutes and then exit the heating furnace;
  • the second opening temperature is 800 ⁇ 950°C
  • the final rolling temperature is 800 ⁇ 900°C
  • the red temperature is 560°C
  • the chemical composition and mass percentage of a 9Ni steel provided in this embodiment are as follows: C: 0.043%, Si: 0.21%, Mn: 0.73%, P: 0.003%, S: 0.0019%, Nb: 0.0020% (residual ), V: 0.001% (residual), Ti: 0.002% (residual), Ni: 9.20%, Cr: 0.02%, Mo: 0.02%, Cu: 0.030%, Al: 0.037%, B: 0.0002%, Mg: 0.0011%, N: 0.0051%, H: 0.00013%, the balance is Fe and inevitable impurities.
  • the preparation method includes the following steps:
  • the molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the composition temperature is consistent, it is sent to RH for vacuum treatment. The vacuum degree is ⁇ 3.0mbar. The vacuum holding time is 23 minutes. After vacuum treatment, 220 meters of magnesium aluminum wire is simmered;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 0.8m/min, the superheat degree is 29°C, and the electromagnetic stirring and dynamic light reduction processes are used.
  • the slab After the slab is out of continuous casting, it is cooled in an insulation pit for 48 hours. Carry out surface inspection. After the cast billet passes the surface inspection, it will be mechanically ground with a grinding depth of 1.7mm. After grinding, the cast billet will be sprayed with high-temperature antioxidant paint with a spray thickness of 0.15mm;
  • the cast billet is processed and sent to the heating furnace for heating.
  • the heating process of the heating furnace is: heating to 600°C at a heating speed of 11°C/min, heating to 600 ⁇ 1000°C at a heating speed of 7°C/min, and heating to 600 ⁇ 1000°C at a heating speed of 2°C/min. to 1000 ⁇ 1100°C, keep at 1100°C for 20 minutes and then exit the heating furnace;
  • S5 is rolled using a two-stage rolling process, with the second opening temperature being 880°C, the final rolling temperature being 860°C, and the red return temperature being 490°C;
  • quenching temperature is 786°C, holding time is 15 minutes, tempering is performed after quenching, tempering temperature is 630°C, holding time is 13 minutes, air cooling;
  • the chemical composition and mass percentage of a 9Ni steel provided in this embodiment are as follows: C: 0.053%, Si: 0.27%, Mn: 0.69%, P: 0.003%, S: 0.0012%, Nb: 0.0030% (residual ), V ⁇ 0.001% (residual), Ti: ⁇ 0.002% (residual), Ni: 9.16%, Cr: 0.03%, Mo: 0.03%, Cu: 0.020%, Al: 0.039%, B: 0.0001%, Mg :0.0015%, N: 0.0044%, H: 0.00013%, the balance is Fe and inevitable impurities.
  • the preparation method includes the following steps:
  • the molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the composition temperature is consistent, it is sent to RH for vacuum treatment. The vacuum degree is ⁇ 3.0mbar. The vacuum holding time is 23 minutes. After vacuum treatment, 220 meters of magnesium aluminum wire is simmered;
  • the molten steel After the molten steel is refining, it is sent to continuous casting for casting.
  • the casting speed is 0.9m/min, the superheat degree is 29°C, and electromagnetic stirring and dynamic light reduction processes are used.
  • the slab After the slab is out of continuous casting, it is cooled in an insulation pit for 48 hours. Carry out surface inspection. After the cast billet passes the surface inspection, it will be mechanically ground with a grinding depth of 1.8mm. After grinding, the cast billet will be sprayed with high-temperature antioxidant paint with a spray thickness of 0.18mm;
  • the cast billet is processed and sent to the heating furnace for heating.
  • the heating process of the heating furnace is: heating to 600°C at a heating speed of 12°C/min, heating to 600 ⁇ 1000°C at a heating speed of 5.5°C/min, and heating to 600 ⁇ 1000°C at a heating speed of 2°C/min. to 1000 ⁇ 1100°C, keep at 1100°C for 20 minutes and then exit the heating furnace;
  • quenching temperature is 785°C, holding time is 20 minutes, tempering is performed after quenching, tempering temperature is 605°C, holding time is 13 minutes, air cooling;
  • the invention is simple to operate, the production process can be stably executed, and the effect is remarkable. It is also suitable for other nickel varieties with nickel addition of 5.5 to 9.8%, and has obvious economic and safety benefits.

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

Abstract

La présente invention divulgue un acier 9Ni et son procédé de production, et se rapporte au domaine technique de la production d'acier. L'acier comprend les constituants chimiques suivants, en pourcentages en masse : C : de 0,030 à 0,060%, Si : de 0,10 à 0,30 %, Mn : de 0,50 à 0,80 %, P ≤ 0,005 %, S ≤ 0,002 %, Nb résiduel ≤ 0,0050 %, V résiduel ≤ 0,003 %, Ti résiduel ≤ 0,005 %, Ni : de 8,50 à 9,50 %, Cr ≤ 0,05 %, Mo ≤ 0,05 %, Cu ≤ 0,050 %, Al : de 0,020 à 0,050 %, B ≤ 0,0005 %, Mg : de 0,0008 à 0,0020 %, N ≤ 0,0060 %, H ≤ 0,0002 %, le reste étant constitué de Fe et d'impuretés inévitables. Au moyen d'une série d'améliorations de procédé sur la fusion, le laminage, le traitement thermique, etc., le problème de procédé lié aux fissures intergranulaires de la nuance de l'acier est résolu, les avantages de la fusion par lots et de la fabrication de la nuance de l'acier sont obtenus, la stabilité de fabrication est considérablement améliorée, et le coût de fabrication est considérablement réduit.
PCT/CN2022/132291 2022-03-24 2022-11-16 Acier 9ni et son procédé de production WO2023179059A1 (fr)

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CN202210297129.8A CN114737114A (zh) 2022-03-24 2022-03-24 一种9Ni用钢及其生产方法
CN202210297129.8 2022-03-24

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CN114737114A (zh) * 2022-03-24 2022-07-12 南京钢铁股份有限公司 一种9Ni用钢及其生产方法
CN116790989A (zh) * 2023-06-30 2023-09-22 湖南华菱湘潭钢铁有限公司 一种超低温调质钢薄板及其制备方法与应用
CN117431464A (zh) * 2023-10-27 2024-01-23 湖南华菱湘潭钢铁有限公司 一种低屈强比高强韧性lng储罐用钢及其生产方法

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