WO2023179059A1 - 9ni steel and production method therefor - Google Patents

9ni steel and production method therefor Download PDF

Info

Publication number
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
Authority
WO
WIPO (PCT)
Prior art keywords
residual
steel
heating
temperature
sent
Prior art date
Application number
PCT/CN2022/132291
Other languages
French (fr)
Chinese (zh)
Inventor
谯明亮
吴俊平
翟冬雨
刘心阳
杨柳
Original Assignee
南京钢铁股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 南京钢铁股份有限公司 filed Critical 南京钢铁股份有限公司
Publication of WO2023179059A1 publication Critical patent/WO2023179059A1/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—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.

Landscapes

  • 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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention discloses 9Ni steel and a production method therefor, and relates to the technical field of steel production. The steel comprises the following chemical components in percentages by mass: 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%, and the balance of Fe and inevitable impurities. By means of a series of process improvements on smelting, rolling, heat treatment, etc., the process problem of intergranular cracks of the steel grade is solved, the advantages of batch smelting and manufacturing of the steel grade are obtained, the manufacturing stability is greatly improved, and the manufacturing cost is greatly reduced.

Description

一种9Ni用钢及其生产方法A kind of 9Ni steel and its production method 技术领域Technical field
本发明涉及钢铁生产技术领域，特别是涉及一种9Ni用钢及其生产方法。The present invention relates to the technical field of steel production, and in particular to a 9Ni steel and a production method thereof.
背景技术Background technique
随着我国钢铁冶金技术的不断发展，钢铁企业品牌竞争优势越来越明显。为了提高竞争力，企业不断开发品种用钢，镍系钢合金含量高，产品质量优异，但目前存在成本高，低端市场应用浪费的情况，其中9Ni用钢是镍含量9％的容器用钢，如何降低9Ni用钢制造成本，是企业取得良好的市场竞争优势的关键一步。With the continuous development of my country's steel and metallurgical technology, the brand competitive advantages of steel companies have become increasingly obvious. In order to improve competitiveness, companies continue to develop varieties of steel. Nickel-based steel has high alloy content and excellent product quality. However, there are currently high costs and waste in low-end market applications. 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.
发明内容Contents of the invention
本发明针对上述技术问题，克服现有技术的缺点，提供一种9Ni用钢，其化学成分及质量百分比如下：C：0.030％～0.060％，Si：0.10％～0.30％，Mn：0.50％～0.80％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。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.
本发明进一步限定的技术方案是：The technical solution further limited by the present invention is:
前所述的一种9Ni用钢，其化学成分及质量百分比如下：C：0.030％～0.050％，Si：0.10％～0.20％，Mn：0.50％～0.70％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。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.
前所述的一种9Ni用钢，其化学成分及质量百分比如下：C：0.035％～0.055％，Si：0.15％～0.25％，Mn：0.55％～0.75％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。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.
前所述的一种9Ni用钢，其化学成分及质量百分比如下：C：0.040％～0.060％，Si：0.20％～0.30％，Mn：0.60％～0.80％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。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.
本发明的另一目的在于提供一种9Ni用钢，包括以下步骤：Another object of the present invention is to provide a 9Ni steel, which includes the following steps:
S1、铁水脱硫后送至转炉冶炼，采用顶底复吹工艺冶炼，镍钼合金随废钢一起加入转炉，并且计入废钢重量，供氧80％进行倒渣，冶炼终点温度1580～1620℃，成分满足要求进行出钢操作；S1. After the molten iron is desulfurized, it is sent to the converter for smelting. It is smelted using the top-bottom blowing process. The nickel-molybdenum alloy is added to the converter together with the scrap steel and is included in the weight of the scrap steel. 80% of the oxygen is supplied for slag pouring. The smelting end temperature is 1580~1620°C. The composition Carry out tapping operations to meet the requirements;
S2、钢水送至精炼进行脱氧合金化及脱硫操作，成分温度符合后送至RH进行真空处理，真空度≤3.0mbar，真空保持时间20～25分钟，真空处理后煨入200～220米镁铝线；S2. 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;
S3、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6～1.3m/min，过热度25～35℃，采用电磁搅拌及动态轻压下工艺，铸坯出连铸后进行保温坑堆冷48小时后进行表检，铸坯表检合格后采用机械修磨，修磨后的铸坯采用高温抗氧化涂料进行喷涂；S3. After the molten steel is refining, it is sent to continuous casting for casting. The casting speed is 0.6~1.3m/min, the superheat degree is 25~35℃, and electromagnetic stirring and dynamic light reduction processes are used. After the slab is out of continuous casting, it is piled in a thermal insulation pit. After 48 hours of cooling, surface inspection is carried out. After the slab passes the surface inspection, mechanical grinding is performed. The grinded slab is sprayed with high-temperature anti-oxidation paint;
S4、铸坯处理好送至加热炉进行加热，加热炉加热过程为：加热速度10～15℃/min加热至600℃，加热速度5～7℃/min加热至600～1000℃，加热速度2℃/min加热至1000～1100℃，1100℃保温20min后出加热炉；S4. The cast billet is processed and sent to the heating furnace for heating. The heating process of the heating furnace is: heating to 600℃ at a heating speed of 10~15℃/min, heating to 600~1000℃ at a heating speed of 5~7℃/min, and heating to 600~1000℃ at a heating speed of 2 ℃/min Heating to 1000~1100℃, holding at 1100℃ for 20 minutes and then exiting the heating furnace;
S5、采用二阶段轧制工艺轧制，二开温度800～950℃，终轧800～900℃，返红温度400～600℃；S5. Rolling using a two-stage rolling process, the second opening temperature is 800~950℃, the final rolling temperature is 800~900℃, and the red return temperature is 400~600℃;
S6、淬火温度760～790℃，保温时间10～30分钟，淬火后进行回火处理， 回火温度550～650℃，保温时间10～15分钟，空冷；S6, quenching temperature 760~790℃, holding time 10~30 minutes, tempering treatment after quenching, tempering temperature 550~650℃, holding time 10~15 minutes, air cooling;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。S7. After heat treatment, the steel plate is inspected, marked, stored and shipped after passing the performance test.
前所述的一种9Ni用钢，步骤S3中修磨深度1～2mm，喷涂厚度0.1～0.3mm。For the aforementioned 9Ni steel, the grinding depth in step S3 is 1 to 2 mm, and the spraying thickness is 0.1 to 0.3 mm.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明通过对钢种机理的深入研究，研究了影响钢种表面质量的因素，进行了相应的开发应用，通过冶炼、轧制、热处理等一系类的工艺改进，解决了钢种晶间裂纹的工艺难题，获得了钢种批量冶炼制造的优势，制造稳定性得到了大幅度的提升，制造成本获得了大幅度的降低，有效提升了产品的市场竞争力；(1) Through in-depth research on the mechanism of steel types, 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;
(2)本发明中采用镁冶金技术改善了夹杂物形态，提升了产品的洁净度，避免了夹杂物物在表面集聚导致晶间裂纹的发生；(2) In the present invention, 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;
(3)本发明中通过降低氮、氢气体含量及磷硫含量，提高钢的碳含量，减少了硫化锰夹杂及气体含量对钢表面质量的恶化，添加少量的铌，起到了固氮、固碳的作用，从而减少表面晶间裂纹的发生率；(3) In the present invention, by reducing the nitrogen, hydrogen gas content and phosphorus and sulfur content, the carbon content of the steel is increased, and the deterioration of the surface quality of the steel caused by manganese sulfide inclusions and gas content is reduced. A small amount of niobium is added to fix nitrogen and carbon. function, thereby reducing the incidence of surface intergranular cracks;
(4)本发明中采用独特的抗氧化涂料进行喷涂，避免了加热过程中铸坯的二次氧化，减少了轧制过程中铸坯表面氧化铁皮的生成量，提升了轧制钢板的表面质量；(4) In the present invention, 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. ;
(5)本发明中高镍钢的相变温度570℃，结束温度是730℃，本发明通过不同的升温速率进行加热工艺质量，降低了线膨胀及导热系数，避免了加热过程的相变应力导致的晶间裂纹的发生；(5) 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;
(6)本发明中加热出钢温度过高会导致铸坯表面的高温氧化裂纹，这种裂纹随着奥氏体的粗大会越发明显，因此，低温出钢有效避免了铸坯表面高温晶间裂纹；(6) Excessively high heating tapping temperature in the present invention will lead to high-temperature oxidation cracks on the surface of the cast slab. Such cracks will become more obvious as the austenite becomes coarser. Therefore, low-temperature tapping effectively avoids high-temperature intergranular cracks on the surface of the cast slab. crack;
(7)本发明中采用低温热处理工艺，可有效避免轧制过程中的沿晶氧化裂纹趋势，避免因宽化导致奥氏体化过程中晶间裂纹的发生，有效降低调质钢板的批量裂纹发生率；(7) 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;
(8)本发明中镍钼合金按废钢形势加入转炉，不影响热量值，同时因为镍钼合金的加入，有效降低了钢水的凝固定，满足了低温出钢的要求，有利于去除碳磷元素，提升了冶炼速度。(8) In the present invention, the nickel-molybdenum alloy is added to the converter in the form of scrap steel without affecting the calorific value. At the same time, 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.
附图说明Description of the drawings
图1为实施例1的金相组织图。Figure 1 is a metallographic structure diagram of Example 1.
具体实施方式Detailed ways
实施例1Example 1
本实施例提供的一种9Ni用钢，其化学成分及质量百分比如下：C：0.039％，Si：0.17％，Mn：0.67％，P:0.004％，S:0.0011％，Nb：0.0030％(残余)，V:0.001％(残余)，Ti：0.002％(残余)，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％，余量为Fe和不可避免的杂质。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.
制备方法包括以下步骤：The preparation method includes the following steps:
S1、铁水脱硫后送至转炉冶炼，采用顶底复吹工艺冶炼，镍钼合金随废钢一起加入转炉，并且计入废钢重量，供氧80％进行倒渣，冶炼终点温度1593℃，成分满足要求进行出钢操作；S1. After the molten iron is desulfurized, it is sent to the converter for smelting. It is smelted using the top-bottom blowing process. The nickel-molybdenum alloy is added to the converter together with the scrap steel and is included in the weight of the scrap steel. 80% of the oxygen is supplied for slag pouring. The smelting end temperature is 1593°C and the composition meets the requirements. Carry out tapping operations;
S2、钢水送至精炼进行脱氧合金化及脱硫操作，成分温度符合后送至RH进行真空处理，真空度≤3.0mbar，真空保持时间23分钟，真空处理后煨入210米镁铝线；S2. 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;
S3、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.9m/min，过热度29℃，采用电磁搅拌及动态轻压下工艺，铸坯出连铸后进行保温坑堆冷48小时 后进行表检，铸坯表检合格后采用机械修磨，修磨深度1.3mm，修磨后的铸坯采用高温抗氧化涂料进行喷涂，喷涂厚度0.16mm；S3. 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. 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;
S4、铸坯处理好送至加热炉进行加热，加热炉加热过程为：加热速度12℃/min加热至600℃，加热速度5.6℃/min加热至600～1000℃，加热速度2℃/min加热至1000～1100℃，1100℃保温20min后出加热炉；S4. The cast billet is processed and sent to the heating furnace for heating. The heating process of the heating furnace is: heating to 600℃ at a heating speed of 12℃/min, heating to 600~1000℃ at a heating speed of 5.6℃/min, and heating to 600~1000℃ at a heating speed of 2℃/min. to 1000~1100℃, keep at 1100℃ for 20 minutes and then exit the heating furnace;
S5、采用二阶段轧制工艺轧制，二开温度800～950℃，终轧800～900℃，返红温度560℃；S5. Rolling using a two-stage rolling process, the second opening temperature is 800~950℃, the final rolling temperature is 800~900℃, and the red temperature is 560℃;
S6、淬火温度760～790℃，保温时间19分钟，淬火后进行回火处理，回火温度650℃，保温时间12分钟，空冷；S6, quenching temperature 760~790℃, holding time 19 minutes, tempering treatment after quenching, tempering temperature 650℃, holding time 12 minutes, air cooling;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。S7. After heat treatment, the steel plate is inspected, marked, stored and shipped after passing the performance test.
实施例2Example 2
本实施例提供的一种9Ni用钢，其化学成分及质量百分比如下：C：0.043％，Si：0.21％，Mn：0.73％，P:0.003％，S:0.0019％，Nb:0.0020％(残余)，V:0.001％(残余)，Ti:0.002％(残余)，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％，余量为Fe和不可避免的杂质。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.
制备方法包括以下步骤：The preparation method includes the following steps:
S1、铁水脱硫后送至转炉冶炼，采用顶底复吹工艺冶炼，镍钼合金随废钢一起加入转炉，并且计入废钢重量，供氧80％进行倒渣，冶炼终点温度1618℃，成分满足要求进行出钢操作；S1. After the molten iron is desulfurized, it is sent to the converter for smelting. It is smelted using the top-bottom blowing process. The nickel-molybdenum alloy is added to the converter together with the scrap steel and is included in the weight of the scrap steel. 80% of the oxygen is supplied for slag pouring. The smelting end temperature is 1618°C and the composition meets the requirements. Carry out tapping operations;
S2、钢水送至精炼进行脱氧合金化及脱硫操作，成分温度符合后送至RH进行真空处理，真空度≤3.0mbar，真空保持时间23分钟，真空处理后煨入220米镁铝线；S2. 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;
S3、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.8m/min，过热度29℃，采用电磁搅拌及动态轻压下工艺，铸坯出连铸后进行保温坑堆冷48小时后进行表检，铸坯表检合格后采用机械修磨，修磨深度1.7mm，修磨后的铸坯采用高温抗氧化涂料进行喷涂，喷涂厚度0.15mm；S3. 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. 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;
S4、铸坯处理好送至加热炉进行加热，加热炉加热过程为：加热速度11℃/min加热至600℃，加热速度7℃/min加热至600～1000℃，加热速度2℃/min加热至1000～1100℃，1100℃保温20min后出加热炉；S4. The cast billet is processed and sent to the heating furnace for heating. The heating process of the heating furnace is: heating to 600℃ at a heating speed of 11℃/min, heating to 600~1000℃ at a heating speed of 7℃/min, and heating to 600~1000℃ at a heating speed of 2℃/min. to 1000~1100℃, keep at 1100℃ for 20 minutes and then exit the heating furnace;
S5、采用二阶段轧制工艺轧制，二开温度880℃，终轧860℃，返红温度490℃；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;
S6、淬火温度786℃，保温时间15分钟，淬火后进行回火处理，回火温度630℃，保温时间13分钟，空冷；S6, 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;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。S7. After heat treatment, the steel plate is inspected, marked, stored and shipped after passing the performance test.
实施例3Example 3
本实施例提供的一种9Ni用钢，其化学成分及质量百分比如下：C：0.053％，Si：0.27％，Mn：0.69％，P:0.003％，S:0.0012％，Nb：0.0030％(残余)，V≤0.001％(残余)，Ti：≤0.002％(残余)，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％，余量为Fe和不可避免的杂质。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.
制备方法包括以下步骤：The preparation method includes the following steps:
S1、铁水脱硫后送至转炉冶炼，采用顶底复吹工艺冶炼，镍钼合金随废钢一起加入转炉，并且计入废钢重量，供氧80％进行倒渣，冶炼终点温度1613℃，成分满足要求进行出钢操作；S1. After the molten iron is desulfurized, it is sent to the converter for smelting. It is smelted using the top-bottom blowing process. The nickel-molybdenum alloy is added to the converter together with the scrap steel and is included in the weight of the scrap steel. 80% of the oxygen is supplied for slag pouring. The smelting end temperature is 1613°C and the composition meets the requirements. Carry out tapping operations;
S2、钢水送至精炼进行脱氧合金化及脱硫操作，成分温度符合后送至RH进 行真空处理，真空度≤3.0mbar，真空保持时间23分钟，真空处理后煨入220米镁铝线；S2. 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;
S3、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.9m/min，过热度29℃，采用电磁搅拌及动态轻压下工艺，铸坯出连铸后进行保温坑堆冷48小时后进行表检，铸坯表检合格后采用机械修磨，修磨深度1.8mm，修磨后的铸坯采用高温抗氧化涂料进行喷涂，喷涂厚度0.18mm；S3. 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. 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;
S4、铸坯处理好送至加热炉进行加热，加热炉加热过程为：加热速度12℃/min加热至600℃，加热速度5.5℃/min加热至600～1000℃，加热速度2℃/min加热至1000～1100℃，1100℃保温20min后出加热炉；S4. The cast billet is processed and sent to the heating furnace for heating. The heating process of the heating furnace is: heating to 600℃ at a heating speed of 12℃/min, heating to 600~1000℃ at a heating speed of 5.5℃/min, and heating to 600~1000℃ at a heating speed of 2℃/min. to 1000~1100℃, keep at 1100℃ for 20 minutes and then exit the heating furnace;
S5、采用二阶段轧制工艺轧制，二开温度910℃，终轧880℃，返红温度510℃；S5. Rolled using a two-stage rolling process, with a second opening temperature of 910°C, a final rolling temperature of 880°C, and a red return temperature of 510°C;
S6、淬火温度785℃，保温时间20分钟，淬火后进行回火处理，回火温度605℃，保温时间13分钟，空冷；S6, quenching temperature is 785℃, holding time is 20 minutes, tempering is performed after quenching, tempering temperature is 605℃, holding time is 13 minutes, air cooling;
S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。S7. After heat treatment, the steel plate is inspected, marked, stored and shipped after passing the performance test.
实施例1-3的各项力学性能如下表：The mechanical properties of Examples 1-3 are as follows:
Figure PCTCN2022132291-appb-000001
Figure PCTCN2022132291-appb-000001
本发明操作简单，生产工艺得以稳定执行，效果显著，同时也适用于镍添加5.5～9.8％的其它镍系品种，具有明显的经济效益和安全效益。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.
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。In addition to the above embodiments, the present invention may also have other embodiments. Any technical solution formed by equivalent substitution or equivalent transformation falls within the protection scope of the present invention.

Claims (6)

  1. 一种9Ni用钢，其特征在于：其化学成分及质量百分比如下：C：0.030％～0.060％，Si：0.10％～0.30％，Mn：0.50％～0.80％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。A kind of 9Ni steel, characterized by: its chemical composition and mass percentage 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.
  2. 根据权利要求1所述的一种9Ni用钢，其特征在于：其化学成分及质量百分比如下：C：0.030％～0.050％，Si：0.10％～0.20％，Mn：0.50％～0.70％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。A 9Ni steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.030% to 0.050%, Si: 0.10% to 0.20%, Mn: 0.50% to 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.
  3. 根据权利要求1所述的一种9Ni用钢，其特征在于：其化学成分及质量百分比如下：C：0.035％～0.055％，Si：0.15％～0.25％，Mn：0.55％～0.75％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。A 9Ni steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.035% to 0.055%, Si: 0.15% to 0.25%, Mn: 0.55% to 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.
  4. 根据权利要求1所述的一种9Ni用钢，其特征在于：其化学成分及质量百分比如下：C：0.040％～0.060％，Si：0.20％～0.30％，Mn：0.60％～0.80％，P≤0.005％，S≤0.002％，残余Nb≤0.0050％，残余V≤0.003％，残余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％，余量为Fe和不可避免的杂质。A 9Ni steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.040% to 0.060%, Si: 0.20% to 0.30%, Mn: 0.60% to 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.
  5. 一种9Ni用钢，其特征在于：应用于权利要求1-4任意一项，包括以下步骤：A kind of 9Ni steel, characterized in that: applied to any one of claims 1-4, including the following steps:
    S1、铁水脱硫后送至转炉冶炼，采用顶底复吹工艺冶炼，镍钼合金随废钢一起加入转炉，并且计入废钢重量，供氧80％进行倒渣，冶炼终点温度1580～1620℃，成分满足要求进行出钢操作；S1. After the molten iron is desulfurized, it is sent to the converter for smelting. It is smelted using the top-bottom blowing process. The nickel-molybdenum alloy is added to the converter together with the scrap steel and is included in the weight of the scrap steel. 80% of the oxygen is supplied for slag pouring. The smelting end temperature is 1580~1620°C. The composition Carry out tapping operations to meet the requirements;
    S2、钢水送至精炼进行脱氧合金化及脱硫操作，成分温度符合后送至RH进行真空处理，真空度≤3.0mbar，真空保持时间20～25分钟，真空处理后煨入200～220米镁铝线；S2. 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;
    S3、钢水精炼处理结束后送至连铸进行浇铸，浇铸速度0.6～1.3m/min，过热度25～35℃，采用电磁搅拌及动态轻压下工艺，铸坯出连铸后进行保温坑堆冷48小时后进行表检，铸坯表检合格后采用机械修磨，修磨后的铸坯采用高温抗氧化涂料进行喷涂；S3. After the molten steel is refining, it is sent to continuous casting for casting. The casting speed is 0.6~1.3m/min, the superheat degree is 25~35℃, and electromagnetic stirring and dynamic light reduction processes are used. After the slab is out of continuous casting, it is piled in a thermal insulation pit. After 48 hours of cooling, surface inspection is carried out. After the slab passes the surface inspection, mechanical grinding is performed. The grinded slab is sprayed with high-temperature anti-oxidation paint;
    S4、铸坯处理好送至加热炉进行加热，加热炉加热过程为：加热速度10～15℃/min加热至600℃，加热速度5～7℃/min加热至600～1000℃，加热速度2℃/min加热至1000～1100℃，1100℃保温20min后出加热炉；S4. The cast billet is processed and sent to the heating furnace for heating. The heating process of the heating furnace is: heating to 600℃ at a heating speed of 10~15℃/min, heating to 600~1000℃ at a heating speed of 5~7℃/min, and heating to 600~1000℃ at a heating speed of 2 ℃/min Heating to 1000~1100℃, holding at 1100℃ for 20 minutes and then exiting the heating furnace;
    S5、采用二阶段轧制工艺轧制，二开温度800～950℃，终轧800～900℃，返红温度400～600℃；S5. Rolling using a two-stage rolling process, the second opening temperature is 800~950℃, the final rolling temperature is 800~900℃, and the red return temperature is 400~600℃;
    S6、淬火温度760～790℃，保温时间10～30分钟，淬火后进行回火处理，回火温度550～650℃，保温时间10～15分钟，空冷；S6, quenching temperature 760~790℃, holding time 10~30 minutes, tempering treatment after quenching, tempering temperature 550~650℃, holding time 10~15 minutes, air cooling;
    S7、热处理后的钢板表检、性能检测合格后标识、入库、发货。S7. After heat treatment, the steel plate is inspected, marked, stored and shipped after passing the performance test.
  6. 根据权利要求5所述的一种9Ni用钢生产方法，其特征在于：所述步骤S3中修磨深度1～2mm，喷涂厚度0.1～0.3mm。A method for producing 9Ni steel according to claim 5, characterized in that: in step S3, the grinding depth is 1 to 2 mm, and the spraying thickness is 0.1 to 0.3 mm.
PCT/CN2022/132291 2022-03-24 2022-11-16 9ni steel and production method therefor WO2023179059A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210297129.8A CN114737114A (en) 2022-03-24 2022-03-24 9Ni steel and production method thereof
CN202210297129.8 2022-03-24

Publications (1)

Publication Number Publication Date
WO2023179059A1 true WO2023179059A1 (en) 2023-09-28

Family

ID=82276289

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/132291 WO2023179059A1 (en) 2022-03-24 2022-11-16 9ni steel and production method therefor

Country Status (2)

Country Link
CN (1) CN114737114A (en)
WO (1) WO2023179059A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114737114A (en) * 2022-03-24 2022-07-12 南京钢铁股份有限公司 9Ni steel and production method thereof
CN116790989A (en) * 2023-06-30 2023-09-22 湖南华菱湘潭钢铁有限公司 Ultralow-temperature quenched and tempered steel sheet and preparation method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103602888A (en) * 2013-12-02 2014-02-26 南京钢铁股份有限公司 Low-compression ratio hot-rolled 9Ni steel thick plate and manufacturing method thereof
JP2019081929A (en) * 2017-10-31 2019-05-30 新日鐵住金株式会社 Nickel-containing steel plate and method for manufacturing the same
CN113046655A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 Wide and thick pipeline steel with excellent low-temperature toughness and manufacturing method thereof
CN114737114A (en) * 2022-03-24 2022-07-12 南京钢铁股份有限公司 9Ni steel and production method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106011627B (en) * 2016-07-05 2017-09-19 南阳汉冶特钢有限公司 A kind of ultralow temperature pressure vessel quenched high strength alloy steel 06Ni9DR steel plates and preparation method thereof
JP7076311B2 (en) * 2017-08-25 2022-05-27 株式会社神戸製鋼所 Manufacturing method of Ni-containing steel sheet
CN110541110B (en) * 2019-08-24 2021-02-26 江阴兴澄特种钢铁有限公司 9Ni steel plate for high-strength low-yield-ratio ship LNG storage tank and manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103602888A (en) * 2013-12-02 2014-02-26 南京钢铁股份有限公司 Low-compression ratio hot-rolled 9Ni steel thick plate and manufacturing method thereof
JP2019081929A (en) * 2017-10-31 2019-05-30 新日鐵住金株式会社 Nickel-containing steel plate and method for manufacturing the same
CN113046655A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 Wide and thick pipeline steel with excellent low-temperature toughness and manufacturing method thereof
CN114737114A (en) * 2022-03-24 2022-07-12 南京钢铁股份有限公司 9Ni steel and production method thereof

Also Published As

Publication number Publication date
CN114737114A (en) 2022-07-12

Similar Documents

Publication Publication Date Title
WO2023179059A1 (en) 9ni steel and production method therefor
CN100462466C (en) Method of producing low-temperature high-toughness steel and steel plate
CN101368251B (en) Steel plate for large-thickness hydrogen-contacting equipment and its production technology
CN109266970B (en) High-nitrogen high-chromium plastic die steel and smelting and heat treatment method thereof
CN108330378A (en) A kind of production method of hydrogen-contacting equipment 14Cr1MoR steel
CN103160734B (en) A kind of pressurized vessel P460NL1 (L2) super-thick steel plate and production method thereof
CN110004371B (en) Wear-resistant steel and smelting method
CN103361561B (en) The preparation method of coupling material weldless steel tube
CN114411068A (en) Heat-resistant steel for automobile turbine shell and exhaust pipe and preparation method thereof
CN113046652B (en) 420 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN108559925A (en) Mould steel and preparation method thereof
CN104762559A (en) Method for producing steel plate for hydrogen-contacting equipment
CN104561837A (en) Steel plate made of pressure vessel steel ASTMA387CL11Gr2 and production method thereof
WO2023155511A1 (en) Method for controlling surface quality of nickel-based steel plate
CN110184529A (en) A kind of middle low-temperature pressure container end socket carbon steel plate and its manufacturing method
CN111485167A (en) Hot-rolled round steel for rare earth microalloyed 25MnCrNiMoA coupler yoke and production method thereof
CN115181911B (en) Super-thick Q500qE bridge steel plate and production method thereof
WO2023197571A1 (en) 360hb-450hb grade abrasion resistant steel and production method therefor
CN115011878A (en) Round steel with high sulfuric acid dew point corrosion resistance and preparation method thereof
WO2023179058A1 (en) 7ni steel and production method therefor
CN109518079A (en) A kind of production method of hydrogen-contacting equipment 15CrMoR steel plate
CN114150222B (en) Large-thickness steel plate for low-temperature pressure vessel and manufacturing method thereof
WO2023179057A1 (en) 09mnnidr steel and production method therefor
CN115261746B (en) Super-thick Q420qE bridge steel plate and production method thereof
CN110565024A (en) Niobium-titanium-containing 550 MPa-grade thick weathering resistant steel and production method thereof

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22933110

Country of ref document: EP

Kind code of ref document: A1