CN113846261A - Production method of cold-rolled steel strip for titanium microalloyed refrigerator side plate steel under non-refining process condition - Google Patents
Production method of cold-rolled steel strip for titanium microalloyed refrigerator side plate steel under non-refining process condition Download PDFInfo
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- 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
- C21C7/076—Use of slags or fluxes as treating agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- 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
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- 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
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- 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
- C21D8/0236—Cold rolling
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- 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
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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 relates to a method for producing cold-rolled steel strip for titanium microalloying refrigerator side plates under non-refining process conditions. Chemical components: c: 0.06-0.10%, Si: 0.05 to 0.12%, Mn: 0.30-0.45%, S: less than or equal to 0.025%, P: less than or equal to 0.025 percent, Als: not less than 0.015%, Ti: 0.025-0.040%; the method is carried out by carrying out deoxidation alloying, ladle slag washing, molten steel component optimization, casting protection effect improvement, hot rolling controlled cooling and cold rolling cover annealing process optimization on the non-refining condition according to the operation steps of converter operation, argon blowing, continuous casting, hot rolling and cold rolling. The invention ensures the product performance, reduces the alloy cost and reduces the inclusion content of molten steel. The yield strength of the cold-rolled steel strip is 330-380MPa, the tensile strength is 440-480MPa, and the elongation after fracture is 22-26%.
Description
Technical Field
The invention relates to a production method of steel for a refrigerator side plate, in particular to a production method of cold-rolled steel strip for titanium microalloyed steel for the refrigerator side plate under the condition of non-refining process.
Background
The steel for the refrigerator side plate is low-alloy-structure high-strength steel, has good mechanical property and welding property, and is applied to the fields of furniture, household appliances and the like.
The weight content of partial elements of Q235B is specifically limited in national standard, wherein C is less than or equal to 0.20 percent, Si is less than or equal to 0.35 percent, Mn is less than or equal to 1.40 percent, P is less than or equal to 0.045 percent, S is less than or equal to 0.045 percent, Cr is less than or equal to 0.3 percent, Ni is less than or equal to 0.3 percent, Cu is less than or equal to 0.4 percent, and N is less than or equal to 0.008 percent; conventional Q235B production method C: 0.15-0.19%, low strength and unstable quality; the non-refining condition has high inclusion grade and the surface quality of the hot rolled strip steel is unstable, so that the surface peeling defect often occurs to influence the yield quality.
In order to solve the quality problems, part of steel enterprises propose that the steel is produced under the condition of external refining, the quality of steel is obviously guaranteed, but the increase of the external refining also causes the increase of the production cost, and main enterprises for doing so comprise first steel, saddle steel and the like.
Some enterprises choose to develop a method for producing the Q235B by titanium microalloying under non-refining conditions, and the main enterprises for doing so are the iron and steel from the Schchen platform Delong and the iron and steel from Yanshan mountain. Wherein: in order to ensure the yield of titanium, the Yanshan steel is added with about 1.5kg/t steel of aluminum, magnesium and calcium for deoxidation in the tapping process, and then titanium microalloying is carried out, so that the strength is ensured under the condition that the titanium content is 0.03-0.045%; cold-rolled steel sheet for refrigerator side panels and method for manufacturing the same (CN201510764837.8) from Panzhihua iron and Steel research institute, Inc., Panzhihua Steel corporation (CN 201510764837.8): a production method of a cold-rolled steel strip for a refrigerator side plate by a continuous annealing mode is disclosed, the yield strength of the steel strip is 223-: 99-105. Although the operation can be used as a refrigerator side plate, the overall yield strength and the tensile strength are controlled to be low, and the annealing mode is continuous annealing.
In summary, how to further improve the yield strength and reduce the alloying cost under the non-refining process condition, and further reduce the inclusion content to ensure the product quality is a problem to be solved in the industry.
Disclosure of Invention
The invention aims to provide a method for producing a steel cold-rolled strip steel for a titanium microalloyed refrigerator side plate under the condition of a non-refining process, in particular to a method for producing a high-performance cold-rolled strip steel with high strength and low inclusion level by carrying out deoxidation alloying, a ladle slag washing process, molten steel component optimization, improvement of protective pouring effect, hot rolling controlled cooling and cover annealing, utilizing titanium microalloying to make up for improvement of strength and reduction of alloy cost at the same time, and carrying out the steps of converter operation, argon blowing, continuous casting, hot rolling and cold rolling.
The invention is realized by the following technical scheme:
a production method of cold-rolled steel strip for titanium microalloying refrigerator side plates under non-refining process conditions comprises the following steps:
a. and (3) converter operation:
blowing in the process: 970Kg/t of molten iron 940-;
end point composition and temperature: c: more than 0.06%, Mn: 0.06-0.10%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, Si: 0.01%, temperature: 1635 and 1665 ℃;
tapping by a converter: tapping for 30 seconds, adding 1.80-2.0kg/t of slag washing material, 1.80-2.0kg/t of top slag ash, adding 3.5-4.5kg/t of silicon-manganese alloy after tapping for 50 seconds, adding 1.0-1.5kg/t of aluminum particles after tapping for 60 seconds, and adding 0.1-0.3kg/t of carburant after tapping for 90 seconds;
b. argon blowing of a steel ladle: after tapping is finished, 1.25-1.50kg/t of ferrotitanium with the Ti content of 30-33% is added after the sample Als of the ladle is more than 0.020%; after the ferrotitanium is added, the steel ladle is softly blown for more than 6min, the argon blowing strength is reduced, the liquid level of the molten steel is not exposed in the argon blowing process, and the Ti content of the steel ladle is ensured to be stable; controlling the composition of the steel ladle molten steel to meet C: 0.05-0.10%, Si: 0.05 to 0.15%, Mn: 0.30-0.45%, S is less than or equal to 0.025%, P is less than or equal to 0.025%, Als: 0.020 to 0.040%, Ti: 0.030-0.050%;
c. continuous casting pouring: the continuous casting uses a ladle long nozzle, a tundish alkaline covering agent, a thermal expansion asbestos gasket and inert gas argon for protective casting, the temperature of a tundish is 1535-1555 ℃, the covering agent is 0.20-0.25kg/t, the protective slag is 0.50-0.65kg/t, the thickness of a liquid slag layer of the protective slag is 8-12mm, the height of the liquid surface of the tundish is more than or equal to 600mm, the thickness of the tundish slag layer is 40-60mm, and the continuous casting drawing speed is 1.0-1.20 m/min; and (3) finished product component C: 0.06-0.10%, Si: 0.05 to 0.12%, Mn: 0.30-0.45%, S: less than or equal to 0.025%, P: less than or equal to 0.025 percent, Als: not less than 0.015%, Ti: 0.025-0.040%;
d. hot rolling: the heating temperature is 1220-;
e. cold rolling: curling tension of acid rolling mill 6.010N/mm2The annealing temperature of the cover annealing process is 620 ℃, the heat preservation time is 10 hours, the elongation of the leveling unit is 2.0 percent and corresponds to the thickness of the finished product of 1.0mm, the elongation of 2.1 percent and corresponds to the thickness of 1.1mm and 1.2mm, the elongation of 2.2 percent and corresponds to the thickness of the finished product of 1.4mm and 1.5mm, and the actual value of the leveling rolling force is between 250 and 330 t.
Compared with the prior art, the invention adopting the technical scheme has the following advantages:
the carbon content of molten steel: 0.06-0.10 percent of manganese, 0.30-0.45 percent of manganese and 0.05-0.12 percent of silicon, which are reduced by about 0.06-0.12 percent of carbon and 0.10-0.20 percent of manganese compared with the prior steel for the refrigerator material, thereby reducing the production cost and the inclusion level in the steel.
And secondly, after the Als component of the steel ladle reaches the target requirement, turning the steel ladle car back to the steel tapping position, adding ferrotitanium into a feeding chute, and after the ferrotitanium is added, requiring the liquid level of molten steel in the steel ladle to be subjected to soft blowing for 6-8min, standardizing ferrotitanium adding time and argon blowing strength of the steel ladle, stabilizing good yield of Ti in the molten steel, stabilizing production rhythm, reducing argon blowing waiting time and improving production efficiency.
Thirdly, by adjusting the slag washing process proportion in the tapping process, 1.80-2.0kg/t of slag washing materials and 1.80-2.0kg/t of top slag ash, the top slag composition of the steel ladle is optimized, the top slag has good fluidity and the capacity of adsorbing impurities, the molten steel fluidity of a continuous casting process is ensured while molten steel impurities are reduced, and meanwhile, a good protective casting effect is carried out by using a large ladle long nozzle, a tundish alkaline covering agent, a thermal expansion asbestos gasket and inert gas argon in continuous casting, so that the yield of Ti elements is further stabilized.
Fourthly, through scientific component design, the carbon content is controlled by low-carbon steel components, the range of 0.14-0.20% of the sub-peritectic range is avoided through design, the Mn content is reduced by increasing titanium elements and exerting the contribution of micro-alloy elements to the strength, the influence on the surface quality of a cold-rolled product is considered, the alloy cost and the content of inclusions in molten steel are reduced by adopting low-silicon component design, and meanwhile, the yield strength, the elongation after fracture and the surface quality of the hot-rolled strip steel are improved.
Fifthly, the hot rolling controlled rolling and controlled cooling ensures that the hot rolled strip steel has better structure and ensures the good processing performance of the hot rolled strip steel.
Sixthly, the problems of large rolling force and rapid abrasion of a texturing roller are solved by optimizing the parameters of a cold rolling cover annealing process and a flattening process, and the good performance and the shape of the cold-rolled strip steel are ensured.
Detailed Description
The invention is further illustrated below with reference to examples, which are intended only for a better understanding of the present invention. Therefore, the examples should not be construed as limiting the scope of the invention.
In the following examples, the converter was a 120T top-bottom combined blown converter, the steel grade was Q235B-T series, the continuous casting was a four-machine four-flow slab caster, the shape was 180 × 870mm, the hot rolling was 950mm, and the cold rolling was 950 mm. The examples are given in the following table:
the routine production process route comprises the following steps: molten iron pretreatment → converter → LF → continuous casting → hot rolling → cold rolling, conventional Q235B steel composition system C for refrigerator side panels: 0.15-0.20%, Mn: 0.27-0.45%, Si: 0.05-0.16%, less than or equal to 0.030% of S and less than or equal to 0.030% of P, the method fully considers the influence of the original C content design in a peritectic region on the quality of a casting blank, adopts low-carbon component design, achieves the effect of improving the strength by utilizing the fine-grained strengthening effect of titanium element, reduces the S, P content compared with the conventional Q235B, and improves the purity of molten steel. The slag washing process after the furnace replaces the refining link, and can save the cost by 50-70 yuan/ton.
Hot rolling mechanical property of refrigerator side plate
| Item | Yield strength MPa | Tensile strength MPa | Elongation after fracture% |
| Conventional process | 300-320 | 410-440 | 25-30％ |
| The invention | 340-390 | 430-470 | 28-34％ |
Cold rolling mechanical property of refrigerator side plate
| Item | Yield strength MPa | Tensile strength MPa | Elongation after fracture% |
| Conventional process | 300-320 | 430-470 | 22-25％ |
| The invention | 330-380 | 440-480 | 23-27％ |
The cold-rolled strip steel produced according to the embodiment has good physical properties and processability in the subsequent downstream customer processing process, and meanwhile, the inclusion level is controlled relatively low, the yield of titanium elements is stabilized under the non-refining condition, the strength is improved through the titanium elements, the contents of carbon and manganese are reduced, the production cost is reduced, and the application and popularization values are good.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (1)
1. A production method of a cold-rolled steel strip for titanium microalloying refrigerator side plates under non-refining process conditions is characterized by comprising the following steps:
a. and (3) converter operation:
blowing in the process: 970Kg/t of molten iron 940-;
end point composition and temperature: c: more than 0.06%, Mn: 0.06-0.10%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, Si: 0.01%, temperature: 1635 and 1665 ℃;
tapping by a converter: tapping for 30 seconds, adding 1.80-2.0kg/t of slag washing material, 1.80-2.0kg/t of top slag ash, adding 3.5-4.5kg/t of silicon-manganese alloy after tapping for 50 seconds, adding 1.0-1.5kg/t of aluminum particles after tapping for 60 seconds, and adding 0.1-0.3kg/t of carburant after tapping for 90 seconds;
b. argon blowing of a steel ladle: after tapping is finished, 1.25-1.50kg/t of ferrotitanium with the Ti content of 30-33% is added after the sample Als of the ladle is more than 0.020%; after the ferrotitanium is added, the steel ladle is softly blown for more than 6min, the argon blowing strength is reduced, the liquid level of the molten steel is not exposed in the argon blowing process, and the Ti content of the steel ladle is ensured to be stable; controlling the composition of the steel ladle molten steel to meet C: 0.05-0.10%, Si: 0.05 to 0.15%, Mn: 0.30-0.45%, S is less than or equal to 0.025%, P is less than or equal to 0.025%, Als: 0.020 to 0.040%, Ti: 0.030-0.050%;
c. continuous casting pouring: the continuous casting uses a ladle long nozzle, a tundish alkaline covering agent, a thermal expansion asbestos gasket and inert gas argon for protective casting, the temperature of a tundish is 1535-1555 ℃, the covering agent is 0.20-0.25kg/t, the protective slag is 0.50-0.65kg/t, the thickness of a liquid slag layer of the protective slag is 8-12mm, the height of the liquid surface of the tundish is more than or equal to 600mm, the thickness of the tundish slag layer is 40-60mm, and the continuous casting drawing speed is 1.0-1.20 m/min; and (3) finished product component C: 0.06-0.10%, Si: 0.05 to 0.12%, Mn: 0.30-0.45%, S: less than or equal to 0.025%, P: less than or equal to 0.025 percent, Als: not less than 0.015%, Ti: 0.025-0.040%;
d. hot rolling: the heating temperature is 1220-;
e. cold rolling: curling tension of acid rolling mill 6.010N/mm2The annealing temperature of the cover annealing process is 620 ℃, the heat preservation time is 10 hours, the elongation of the leveling unit is 2.0 percent and corresponds to the thickness of the finished product of 1.0mm, the elongation of 2.1 percent and corresponds to the thickness of 1.1mm and 1.2mm, the elongation of 2.2 percent and corresponds to the thickness of the finished product of 1.4mm and 1.5mm, and the actual value of the leveling rolling force is between 250 and 330 t.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114525392A (en) * | 2022-02-22 | 2022-05-24 | 新疆八一钢铁股份有限公司 | Preparation method of titanium-carbon bistable carbon structural steel cold-rolled sheet |
| CN115679061A (en) * | 2022-11-17 | 2023-02-03 | 唐山瑞丰钢铁（集团）有限公司 | Production method of cold-rolled strip steel made of smooth guide rail material |
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