CN114737111A - Steel for 5Ni and production method thereof - Google Patents

Steel for 5Ni and production method thereof Download PDF

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CN114737111A
CN114737111A CN202210297087.8A CN202210297087A CN114737111A CN 114737111 A CN114737111 A CN 114737111A CN 202210297087 A CN202210297087 A CN 202210297087A CN 114737111 A CN114737111 A CN 114737111A
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less
percent
residual
steel
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翟冬雨
刘心阳
杨柳
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • 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
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    • 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
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
    • C22C38/46—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
    • 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
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Abstract

The invention discloses a steel for 5Ni and a production method thereof, relating to the technical field of steel production, wherein the steel comprises the following chemical components in percentage by mass: c: 0.040% -0.070%, Si: 0.10-0.30%, Mn: 0.60-0.90%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, and Ni: 4.50% -5.50%, Cr: 0.05-0.15%, Mo: 0.05-0.10%, Cu is less than or equal to 0.050%, Al: 0.020% -0.050%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities. Through a series of process improvements such as smelting, rolling, heat treatment and the like, the process problem of intergranular cracks of the steel grades is solved, the advantages of batch smelting and manufacturing of the steel grades are obtained, the manufacturing stability is greatly improved, and the manufacturing cost is greatly reduced.

Description

Steel for 5Ni and production method thereof
Technical Field
The invention relates to the technical field of steel production, in particular to 5Ni steel and a production method thereof.
Background
With the continuous development of ferrous metallurgy technology in China, the brand competitive advantage of steel enterprises is more and more obvious. In order to improve the competitiveness, enterprises continuously develop steel for varieties, the content of nickel-based steel alloy is high, the product quality is excellent, but the current situations of high cost and waste in low-end market application exist. According to the market demand relationship and the difficulty, nickel series steel series with different grades are gradually developed, wherein the 5Ni steel is the steel for the container with 5 percent of nickel content, and the key step for enterprises to obtain good market competitive advantages is how to reduce the manufacturing cost of the 5Ni steel.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides 5Ni steel which comprises the following chemical components in percentage by mass: c: 0.040% -0.070%, Si: 0.10-0.30%, Mn: 0.60-0.90%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, and Ni: 4.50% -5.50%, Cr: 0.05-0.15%, Mo: 0.05-0.10%, Cu is less than or equal to 0.050%, Al: 0.020% -0.050%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the steel for 5Ni comprises the following chemical components in percentage by mass: c: 0.040% -0.060%, Si: 0.10-0.20%, Mn: 0.60 to 0.80 percent, less than or equal to 0.005 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0050 percent of residual Nb, less than or equal to 0.003 percent of residual V, less than or equal to 0.005 percent of residual Ti, Ni: 4.50% -5.30%, Cr: 0.05-0.10%, Mo: 0.05-0.08%, Cu is less than or equal to 0.050%, Al: 0.020% -0.045%, Mg: 0.0008 to 0.0018 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
The steel for 5Ni comprises the following chemical components in percentage by mass: c: 0.045% -0.065%, Si: 0.15-0.25%, Mn: 0.70-0.80%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, and Ni: 4.80-5.20%, Cr: 0.08-0.13%, Mo: 0.06-0.10%, Cu is less than or equal to 0.050%, Al: 0.025% -0.045%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
The steel for 5Ni comprises the following chemical components in percentage by mass: c: 0.050% -0.070%, Si: 0.20-0.30%, Mn: 0.70-0.90%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, and Ni: 4.80-5.50%, Cr: 0.08-0.15%, Mo: 0.06-0.10%, Cu is less than or equal to 0.050%, Al: 0.025% -0.050%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
The invention also aims to provide a production method of the steel for 5Ni, which comprises the following steps:
s1, desulfurizing the molten iron, then sending the molten iron to a converter for smelting, adopting a top-bottom combined blowing process for smelting, supplying 80% of oxygen for deslagging, and carrying out tapping operation when the smelting end point temperature is 1590-1620 ℃ and the components meet the requirements;
s2, feeding molten steel to refining for deoxidation alloying and desulfurization, feeding the molten steel to RH for vacuum treatment after the component temperature meets the requirement, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum retention time is 15-25 minutes, and roasting 200-220 m magnesium-aluminum wires after the vacuum treatment;
s3, after finishing molten steel refining, sending the casting blank to continuous casting for casting, wherein the casting speed is 0.6-1.3 m/min, the superheat degree is 25-35 ℃, an electromagnetic stirring and dynamic soft reduction process is adopted, after the casting blank is discharged from the continuous casting, a heat preservation pit is cooled for 48 hours in a pile, and then surface inspection is carried out, mechanical grinding is adopted after the surface inspection of the casting blank is qualified, and the ground casting blank is sprayed by high-temperature antioxidant coating;
s4, treating the casting blank, conveying the casting blank to a heating furnace for heating, heating to 600 ℃ at a heating speed of 13-15 ℃/min, heating to 600-1000 ℃ at a heating speed of 6-8 ℃/min, heating to 1000-1150 ℃ at a heating speed of 3-5 ℃/min, and directly tapping and rolling without heat preservation after the temperature is 1150 ℃;
s5, rolling by adopting a two-stage rolling process, wherein the second-stage rolling temperature is 800-950 ℃, the final rolling temperature is 800-900 ℃, and the re-reddening temperature is 400-600 ℃;
s6, quenching at the temperature of 800-830 ℃, keeping the temperature for 20-40 minutes, tempering at the temperature of 500-550 ℃ for 10-15 minutes after quenching, and air cooling;
and S7, performing surface inspection and performance inspection on the steel plate after heat treatment, marking, warehousing and delivering.
In the production method of the 5Ni steel, in the step S3, the grinding depth is 1-2 mm, and the spraying thickness is 0.1-0.3 mm.
The invention has the beneficial effects that:
(1) the invention researches the factors influencing the surface quality of the steel by deeply researching the mechanism of the steel, carries out corresponding development and application, solves the process problem of intergranular cracks of the steel by a series of process improvements such as smelting, rolling, heat treatment and the like, obtains the advantages of batch smelting and manufacturing of the steel, greatly improves the manufacturing stability, greatly reduces the manufacturing cost and effectively improves the market competitiveness of the product;
(2) the invention adopts the magnesium metallurgy technology to improve the form of impurities, improve the cleanliness of the product and avoid intergranular cracks caused by the aggregation of impurities on the surface;
(3) according to the invention, the carbon content of steel is improved by reducing the nitrogen and hydrogen gas content and the phosphorus and sulfur content, the manganese sulfide inclusion and the deterioration of the gas content on the surface quality of the steel are reduced, and a small amount of niobium is added, so that the effects of nitrogen fixation and carbon fixation are achieved, and the incidence rate of surface intergranular cracks is reduced;
(4) according to the invention, the unique antioxidant coating is adopted for spraying, so that the secondary oxidation of the casting blank in the heating process is avoided, the generation amount of iron oxide scales on the surface of the casting blank in the rolling process is reduced, and the surface quality of the rolled steel plate is improved;
(5) the phase change temperature of the high nickel steel is 570 ℃, the finishing temperature is 730 ℃, the heating process quality is carried out at different heating rates, the linear expansion and the heat conductivity coefficient are reduced, and intergranular cracks caused by phase change stress in the heating process are avoided;
(6) according to the invention, high-temperature oxidation cracks on the surface of the casting blank can be caused by overhigh heating tapping temperature, and the cracks become more obvious along with the coarseness of austenite, so that high-temperature intergranular cracks on the surface of the casting blank are effectively avoided by low-temperature tapping;
(7) the invention adopts a low-temperature heat treatment process, can effectively avoid the crystal-following oxidation crack tendency in the rolling process, avoids the intergranular cracks in the austenitizing process caused by broadening, and effectively reduces the batch crack occurrence rate of the quenched and tempered steel plates.
Drawings
FIG. 1 is a metallographic structure diagram of example 1.
Detailed Description
Example 1
The steel for 5Ni provided in this example has the following chemical components by mass percent: c: 0.053%, Si: 0.16%, Mn: 0.67%, P: 0.004%, S: 0.0014%, Nb: 0.0040% (residual), V: 0.001% (residual), Ti: 0.002% (residual), Ni: 4.96%, Cr: 0.09%, Mo: 0.07%, Cu: 0.030%, Al: 0.042%, Mg: 0.0016%, N: 0.0039%, H: 0.00011%, O: 0.0013%, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps:
s1, desulfurizing the molten iron, then sending the molten iron to a converter for smelting, adopting a top-bottom combined blowing process for smelting, supplying 80% of oxygen for deslagging, and carrying out tapping operation when the smelting end point temperature is 1599 ℃ and the components meet the requirements;
s2, sending the molten steel to refining for deoxidation alloying and desulfurization, sending the molten steel to RH for vacuum treatment after the component temperature is in accordance with the requirement, keeping the vacuum degree at less than or equal to 3.0mbar for 19 minutes, and roasting the molten steel into a 210-meter magnesium-aluminum wire after the vacuum treatment;
s3, after finishing molten steel refining, sending the casting blank to continuous casting for casting, wherein the casting speed is 1.2m/min, the superheat degree is 33 ℃, an electromagnetic stirring and dynamic soft reduction process is adopted, the casting blank is discharged from the continuous casting, a heat preservation pit is cooled in a pile for 48 hours, then surface inspection is carried out, mechanical grinding is adopted after the casting blank surface inspection is qualified, the grinding depth is 1.8mm, the ground casting blank is sprayed by high-temperature antioxidant coating, and the spraying thickness is 0.15 mm;
s4, treating the casting blank, conveying the casting blank to a heating furnace for heating, heating to 600 ℃ at a heating speed of 15 ℃/min, heating to 600-1000 ℃ at a heating speed of 8 ℃/min, heating to 1000-1150 ℃ at a heating speed of 3 ℃/min, and directly tapping and rolling at 1150 ℃ without heat preservation;
s5, rolling by adopting a two-stage rolling process, wherein the second-stage rolling temperature is 889 ℃, the final rolling temperature is 873 ℃, and the re-reddening temperature is 532 ℃;
s6, quenching at 813 ℃, keeping the temperature for 29 minutes, tempering at 535 ℃, keeping the temperature for 12 minutes after quenching, and air cooling;
and S7, performing surface inspection and performance inspection on the steel plate after heat treatment, marking, warehousing and delivering.
Example 2
The steel for 5Ni provided in this example has the following chemical components by mass percent: c: 0.059%, Si: 0.21%, Mn: 0.77%, P: 0.003%, S: 0.0016%, Nb: 0.0020% (residue), V: 0.001% (residual), Ti: 0.001% (residual), Ni: 5.12%, Cr: 0.11%, Mo: 0.09%, Cu: 0.020%, Al: 0.041%, Mg: 0.0017%, N: 0.0044%, H: 0.00011%, O: 0.0011%, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps:
s1, desulfurizing the molten iron, then sending the molten iron to a converter for smelting, adopting a top-bottom combined blowing process for smelting, supplying 80% of oxygen for deslagging, and carrying out tapping operation when the smelting end point temperature is 1594 ℃ and the components meet the requirements;
s2, sending the molten steel to refining for deoxidation alloying and desulfurization, sending the molten steel to RH for vacuum treatment after the component temperature is in accordance with the requirement, keeping the vacuum degree at less than or equal to 3.0mbar for 17 minutes, and roasting the molten steel into a 210-meter magnesium-aluminum wire after the vacuum treatment;
s3, after finishing molten steel refining, sending the casting blank to continuous casting for casting, wherein the casting speed is 0.7m/min, the superheat degree is 28 ℃, an electromagnetic stirring and dynamic soft reduction process is adopted, the casting blank is discharged from the continuous casting, a heat preservation pit is cooled in a pile for 48 hours, then surface inspection is carried out, mechanical grinding is adopted after the casting blank surface inspection is qualified, the grinding depth is 1.3mm, the ground casting blank is sprayed by high-temperature antioxidant coating, and the spraying thickness is 0.2 mm;
s4, treating the casting blank, conveying the casting blank to a heating furnace for heating, heating to 600 ℃ at a heating speed of 14 ℃/min, heating to 600-1000 ℃ at a heating speed of 6.6 ℃/min, heating to 1000-1150 ℃ at a heating speed of 3.3 ℃/min, and directly tapping and rolling without heat preservation after 1150 ℃;
s5, rolling by adopting a two-stage rolling process, wherein the second-stage rolling temperature is 945 ℃, the final rolling temperature is 896 ℃, and the re-reddening temperature is 596 ℃;
s6, quenching at 829 ℃ for 20 minutes, tempering at 545 ℃ for 15 minutes after quenching, and air cooling;
and S7, performing surface inspection and performance inspection on the steel plate after heat treatment, marking, warehousing and delivering.
Example 3
The steel for 5Ni provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.068%, Si: 0.21%, Mn: 0.73%, P: 0.003%, S: 0.0011%, Nb: 0.0020% (residual), V: 0.001% (residual), Ti: 0.003% (residual), Ni: 5.1%, Cr: 0.13%, Mo: 0.09%, Cu: 0.020%, Al: 0.041%, Mg: 0.0017%, N: 0.0035%, H: 0.00014%, O: 0.0012%, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps:
s1, desulfurizing the molten iron, then sending the molten iron to a converter for smelting, adopting a top-bottom combined blowing process for smelting, supplying 80% of oxygen for deslagging, and carrying out tapping operation when the smelting end temperature is 1600 ℃ and the components meet the requirements;
s2, sending the molten steel to refining for deoxidation alloying and desulfurization, sending the molten steel to RH for vacuum treatment after the component temperature is accordant, keeping the vacuum degree less than or equal to 3.0mbar for 17 minutes, and roasting 210 m magnesium-aluminum wires after the vacuum treatment;
s3, after finishing molten steel refining, sending the casting blank to continuous casting for casting, wherein the casting speed is 0.9m/min, the superheat degree is 30 ℃, an electromagnetic stirring and dynamic soft reduction process is adopted, the casting blank is discharged from the continuous casting, a heat preservation pit is cooled in a pile for 48 hours, then surface inspection is carried out, mechanical grinding is adopted after the casting blank surface inspection is qualified, the grinding depth is 1.0mm, and the ground casting blank is sprayed with high-temperature antioxidant coating with the spraying thickness of 0.13 mm;
s4, treating the casting blank, conveying the casting blank to a heating furnace for heating, heating to 600 ℃ at a heating speed of 14 ℃/min, heating to 600-1000 ℃ at a heating speed of 7 ℃/min, heating to 1000-1150 ℃ at a heating speed of 5 ℃/min, and directly tapping and rolling at 1150 ℃ without heat preservation;
s5, rolling by adopting a two-stage rolling process, wherein the second-stage rolling temperature is 840 ℃, the final rolling temperature is 820 ℃, and the re-reddening temperature is 470 ℃;
s6, quenching at 826 ℃ for 27 minutes, tempering at 530 ℃ for 13 minutes after quenching, and air cooling;
and S7, performing surface inspection and performance inspection on the steel plate after heat treatment, marking, warehousing and delivering.
The mechanical properties of examples 1-3 are given in the following table:
Figure 812832DEST_PATH_IMAGE002
the method has the advantages of simple operation, stable execution of the production process, obvious effect, suitability for other nickel series varieties with 0.35-5.5% of nickel, and obvious economic benefit and safety benefit.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (6)

1. A steel for 5Ni, characterized in that: the chemical components and the mass percentage are as follows: c: 0.040% -0.070%, Si: 0.10-0.30%, Mn: 0.60 to 0.90 percent, less than or equal to 0.005 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0050 percent of residual Nb, less than or equal to 0.003 percent of residual V, less than or equal to 0.005 percent of residual Ti, Ni: 4.50% -5.50%, Cr: 0.05-0.15%, Mo: 0.05-0.10%, Cu is less than or equal to 0.050%, Al: 0.020% -0.050%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
2. The steel for 5Ni according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.040% -0.060%, Si: 0.10-0.20%, Mn: 0.60-0.80%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, and Ni: 4.50% -5.30%, Cr: 0.05-0.10%, Mo: 0.05-0.08%, Cu is less than or equal to 0.050%, Al: 0.020% -0.045%, Mg: 0.0008 to 0.0018 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
3. The steel for 5Ni according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.045% -0.065%, Si: 0.15-0.25%, Mn: 0.70-0.80%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, and Ni: 4.80-5.20%, Cr: 0.08-0.13%, Mo: 0.06-0.10%, Cu is less than or equal to 0.050%, Al: 0.025% -0.045%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
4. The steel for 5Ni according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.050% -0.070%, Si: 0.20-0.30%, Mn: 0.70-0.90%, P is less than or equal to 0.005%, S is less than or equal to 0.002%, residual Nb is less than or equal to 0.0050%, residual V is less than or equal to 0.003%, residual Ti is less than or equal to 0.005%, Ni: 4.80-5.50%, Cr: 0.08-0.15%, Mo: 0.06-0.10%, Cu is less than or equal to 0.050%, Al: 0.025-0.050%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
5. A production method of steel for 5Ni is characterized by comprising the following steps: application to any of claims 1-4, comprising the steps of:
s1, desulfurizing the molten iron, then sending the molten iron to a converter for smelting, adopting a top-bottom combined blowing process for smelting, pouring slag by supplying 80% of oxygen, and carrying out tapping operation when the smelting end point temperature is 1590-1620 ℃ and the components meet the requirements;
s2, sending the molten steel to refining for deoxidation alloying and desulfurization, sending the molten steel to RH for vacuum treatment after the component temperature is accordant, keeping the vacuum degree at less than or equal to 3.0mbar for 15-25 minutes, and roasting 200-220 m magnesium-aluminum wire after the vacuum treatment;
s3, after finishing molten steel refining, sending the casting blank to continuous casting for casting, wherein the casting speed is 0.6-1.3 m/min, the superheat degree is 25-35 ℃, an electromagnetic stirring and dynamic soft reduction process is adopted, after the casting blank is discharged from the continuous casting, a heat preservation pit is cooled for 48 hours in a pile, and then surface inspection is carried out, mechanical grinding is adopted after the surface inspection of the casting blank is qualified, and the ground casting blank is sprayed by high-temperature antioxidant coating;
s4, treating the casting blank, conveying the casting blank to a heating furnace for heating, heating to 600 ℃ at a heating speed of 13-15 ℃/min, heating to 600-1000 ℃ at a heating speed of 6-8 ℃/min, heating to 1000-1150 ℃ at a heating speed of 3-5 ℃/min, and directly tapping and rolling without heat preservation after the temperature is 1150 ℃;
s5, rolling by adopting a two-stage rolling process, wherein the second-stage rolling temperature is 800-950 ℃, the final rolling temperature is 800-900 ℃, and the re-reddening temperature is 400-600 ℃;
s6, quenching at the temperature of 800-830 ℃, keeping the temperature for 20-40 minutes, tempering at the temperature of 500-550 ℃ for 10-15 minutes after quenching, and air cooling;
and S7, performing surface inspection and performance inspection on the steel plate after heat treatment, marking, warehousing and delivering.
6. The method for producing steel for 5Ni according to claim 5, wherein: in the step S3, the grinding depth is 1-2 mm, and the spraying thickness is 0.1-0.3 mm.
CN202210297087.8A 2022-03-24 2022-03-24 Steel for 5Ni and production method thereof Pending CN114737111A (en)

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