CN114774799B - Wear-resistant round bar for agricultural machinery and production method thereof - Google Patents
Wear-resistant round bar for agricultural machinery and production method thereof 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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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- 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
- C22C38/06—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
- C22C38/18—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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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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
- 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
Abstract
The invention discloses a wear-resistant round bar for agricultural machinery and a production method thereof, wherein the wear-resistant round bar comprises the following chemical components in percentage by mass: c:0.15 to 0.020%, mn:0.80 to 1.10%, si: 0.20-0.40%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, al:0.020 to 0.050%, cr:0.50-0.80%, cu:0.20 to 0.40%, ni: 0.070-0.110%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of converter smelting, argon blowing after the converter, square billet continuous casting, hot rolling and cooling and bundling of a cooling bed. The crystallizer of the invention adopts electric stirring and final stirring to eliminate central shrinkage cavity and central segregation of continuous casting billets and eliminate segregation of elements on the surfaces of the casting billets, and adopts a heating-free direct rolling technology to produce round bar products with phi of 18-25mm, thereby realizing low-cost production of high-quality wear-resistant round bars.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a wear-resistant round bar for agricultural machinery and a production method thereof.
Background
Agricultural machinery is a general term for various mechanical equipment used in agricultural production. Agricultural machinery mainly comprises traction power machinery and operation platform machinery, and operation platform machinery mainly includes: tillage machinery, plant protection machinery, irrigation and drainage machinery, planting and fertilizing machinery, harvesting machinery and other machinery with various professional purposes. Agricultural machinery needs to be frequently contacted with soil, gravel, plants and the like, so that the contact part is required to have good wear resistance, acid-base resistance and fatigue resistance, and an agricultural machine worktable needs to be manufactured into components in different shapes through steps of forming, welding and the like according to different purposes, so that the material is required to have good forming performance and welding performance.
Agricultural machinery manufacturing enterprises generally adopt Q235, Q355 level ordinary material preparation agricultural machinery workstation, Q235, Q355 material mainly are well carbon material, rely on C, mn element to promote the material performance, designs such as wear-resisting, acid and alkali-resistance, anti-corrosion, and agricultural machinery operational environment is changeable, receives dew, plant juice erosion, is worn by sand and soil, therefore agricultural machinery part loss is serious, need frequently to repair the change, influences the normal operation of agricultural machinery. Therefore, the development of wear-resistant steel for agricultural machinery is urgently needed to meet the market demand.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wear-resistant round bar for agricultural machinery and a production method thereof. The wear-resistant round bar for the agricultural machine is produced by adopting a square billet continuous casting-bar direct rolling process, and wear-resistant, acid-base-resistant elements such as Cu, ni and Cr are added into the product, so that the wear-resistant performance of the product is effectively improved; by adopting the crystallizer electric stirring and final stirring technology, the central shrinkage cavity and the central segregation of the continuous casting billet can be effectively eliminated; the production method has the characteristics of short flow, low cost and good quality.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a wear-resistant round rod for agricultural machinery comprises the following chemical components in percentage by mass: 0.15 to 0.020%, mn:0.80 to 1.10%, si: 0.20-0.40%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, al:0.020 to 0.050%, cr:0.50-0.80%, cu:0.20 to 0.40%, ni: 0.070-0.110%, and the balance of Fe and inevitable impurities.
The diameter of the wear-resistant round rod is 18-25mm, and the structure is ferrite plus pearlite.
The mechanical property Rm of the wear-resistant round rod is as follows: 500-630MPa, rel is more than or equal to 355MPa, and the elongation A is more than or equal to 25 percent.
The invention also provides a production method of the wear-resistant round rod for the agricultural machinery, which comprises the steps of converter smelting, argon blowing after the converter, square billet continuous casting, hot rolling and cooling and bundling by a cooling bed; in the continuous casting process of the square billet, the superheat degree of molten steel in a tundish is 15-35 ℃, the casting speed of a continuous casting machine is controlled to be 3.6-4.0 m/min, the melting point of casting powder used by a crystallizer is 1030-1150 ℃, the alkalinity is 0.80-1.00, the viscosity is 0.20-0.40 P.S, and the secondary cooling adopts a medium-weak cooling mode with the specific water amount of 0.7-1.0L/kg of steel.
In the continuous casting process, a crystallizer is adopted to perform electromagnetic stirring and tail end electromagnetic stirring, and the electromagnetic stirring parameters are as follows: the current is 380-450A, and the frequency is 2-5Hz; terminal electromagnetic stirring parameters: the current is 420-480A, and the frequency is 5-10Hz. By adopting the crystallizer electric stirring and terminal stirring technology, the central shrinkage cavity and the central segregation of the continuous casting billet can be effectively eliminated.
The hot rolling procedure adopts a heating-free direct rolling technology, has no casting blank heating link, has no element segregation behavior on the surface of a casting blank, adopts a high-speed conveying scheme and a whole-process heat preservation technology on a direct rolling roller way, and has the following conveying speed: 2-3.5m/s; the head temperature of a rough rolling initial rolling casting blank is more than or equal to 960 ℃, and the head-tail temperature difference is less than or equal to 60 ℃; after the square billet is subjected to rough-medium-finish rolling, a round bar product with the diameter phi of 18-25mm is obtained.
In the converter smelting process, S in molten iron entering the converter is less than or equal to 0.040 percent, and P is less than or equal to 0.140 percent; lime and light-burned dolomite are adopted for slagging, 30-40 kg/t of lime is added, and 15-20 kg/t of light-burned dolomite is added; adding 2.0-4.0 kg/t copper plate and 0.5-1.1 kg/t electrolytic nickel into the scrap steel, adding silicon-manganese alloy and high-carbon ferrochrome into the furnace, and alloying the converter, wherein the end point is as follows: the carbon content is 0.04-0.10%, and the phosphorus content P is less than or equal to 0.020%.
In the post-furnace argon blowing process, al is added for final deoxidation, and the static blowing time is 5-8 min; the temperature of the argon blowing station is 1585-1610 ℃.
The post-furnace argon blowing process controls the chemical components and the mass percentage of the molten steel at the outlet of the argon blowing station to be as follows: c:0.15 to 0.020%, mn:0.80 to 1.10%, si: 0.20-0.40%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, al:0.020 to 0.050%, cr:0.50-0.80%, cu:0.20 to 0.40%, ni: 0.070-0.110%, and the balance of Fe and inevitable impurities.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. according to the invention, a mechanical equipment series is developed in a bar product in the traditional sense, and the wear resistance and the practical performance of the product are improved from the perspective of serving the product. The invention uses conventional steel smelting, and adds common elements such as Cu, ni, cr and the like according to a theoretical basis to obtain the bar material with better strength, toughness, wear resistance, acid and alkali resistance. 2. After Cu, ni and Cr elements are added into steel, the wear resistance, acid and alkali resistance of the product can be obviously improved, and the service life of the product can be obviously prolonged by contacting and rubbing with crop straws in operation after the feed rod is manufactured. 3. The invention adopts the crystallizer electric stirring and end stirring technology, and can effectively eliminate the central shrinkage cavity and the central segregation of the continuous casting billet. 4. The continuous casting secondary cooling technology adopted by the invention can eliminate the phenomena of uneven heat transfer and casting blank cracks caused by adding Cu, ni and Cr in steel, and ensure the surface quality of the round bar product. 5. The invention adopts the square billet continuous casting and hot rolling process, adopts the heating-free direct rolling technology, has no casting blank heating link, has no segregation behavior of elements on the surface of the casting blank, and ensures the surface quality of the round bar product; reduces the energy consumption of the whole process and the production cost, has the characteristics of short flow, low energy consumption and simple technical process, provides assistance for the emission reduction and clean production of enterprises,
finally, the hot-rolled round bar with the diameter of 18-25mm is produced, and the high-quality wear-resistant round bar is produced at low cost.
Drawings
FIG. 1 is a macrostructure diagram of a cast slab in example 1;
FIG. 2 is a metallographic structure chart (200X) of the wear-resistant round bar in example 1.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples.
Example 1
The diameter of the wear-resistant round rod product for the agricultural machinery is phi 18mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the wear-resistant round rod product for the agricultural machinery comprises the steps of converter smelting, argon blowing wire feeding at an argon blowing station, square billet continuous casting, hot rolling and cold bed cutting and bundling, and the specific production process comprises the following steps:
(1) Smelting in a converter: and (3) charging molten iron into the furnace, wherein S:0.028%, P:0.121 percent; lime and light-burned dolomite are adopted for slagging, 38kg/t of lime is added, and 20kg/t of light-burned dolomite is added; 2.4kg/t of copper plate and 0.8kg/t of electrolytic nickel are added along with scrap steel; and (3) finishing the converter: c:0.043%, P:0.012%; during the tapping process, steel grit aluminum is added for deoxidation alloying, and 14kg/t of silicon-manganese alloy and 11kg/t of high-carbon ferrochrome are added.
(2) Blowing argon after the furnace: feeding Al wires to adjust the Al content in the steel, stirring and statically blowing argon for 6min, and taking out at 1585 ℃; the chemical compositions and the mass percentage of the molten steel discharged from the argon blowing station are shown in the table 1.
(3) A square billet continuous casting process: the superheat degree of the molten steel of the tundish is 18-26 ℃, the drawing speed of a continuous casting machine is controlled at 3.7m/min, the melting point of the casting powder used by the crystallizer is 1050 ℃, the alkalinity is 0.90, the viscosity is 0.25 P.S, and the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.75L/kg of steel. And stirring the interior of the casting blank by adopting a crystallizer electromagnetic stirring and tail end stirring technology (electromagnetic stirring parameters are 380A of current and 2Hz of frequency, and tail end electromagnetic stirring parameters are 420A of current and 5Hz of frequency).
(4) A hot rolling procedure: conveying speed of a straight rolling roller way: 2m/s, the head temperature of a rough rolling initial rolling casting blank is 963 ℃, the tail temperature is 912 ℃, and the thickness of the rough rolling initial rolling casting blank is 165 x 165mm 2 After 16 passes of rough, medium and fine rolling, the square billet is rolled into a round bar with the diameter of 18 mm.
The wear-resistant round rod for the agricultural machine has the following properties: tensile strength 558MPa, yield strength 426MPa, elongation a:28 percent; the surface of the product has no defects such as cracks, scars and the like.
FIG. 1 is a macrostructure diagram of a cast slab obtained in example 1, and it can be seen from FIG. 1 that the cast slab is excellent in quality, the center is reduced in porosity, and no center segregation is present; FIG. 2 is a metallographic structure (200X) of the wear-resistant round bar obtained in example 1, and it can be seen from FIG. 2 that the structure is ferrite + pearlite, and the structure is fine and uniform. (examples 2 to 5 the drawings are similar to example 1 and are omitted.)
Example 2
The diameter of the wear-resistant round rod product for the agricultural machinery is phi 20mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the wear-resistant round rod product for the agricultural machinery comprises the steps of converter smelting, argon blowing wire feeding at an argon blowing station, square billet continuous casting, hot rolling and cold bed cutting and bundling, and the specific production process comprises the following steps:
(1) Smelting in a converter: and (3) charging molten iron into the furnace, wherein S:0.024%, P:0.118%; lime and light-burned dolomite are adopted for slagging, 38.6kg/t of lime is added, and 19kg/t of light-burned dolomite is added; 2.5kg/t of copper plate and 0.9kg/t of electrolytic nickel are added along with the scrap steel; and (3) finishing the converter: c:0.049%, P:0.015 percent; adding steel grit aluminum for deoxidation alloying in the tapping process, and adding 15kg/t of silicon-manganese alloy and 11kg/t of high-carbon ferrochrome.
(2) Blowing argon after the furnace: feeding Al wires to adjust the Al content in the steel, stirring and statically blowing argon for 6min, and keeping the station leaving temperature of an argon blowing station at 1595 ℃; the chemical compositions and the mass percentage of the molten steel discharged from the argon blowing station are shown in the table 1.
(3) A square billet continuous casting process: the superheat degree of the molten steel of the tundish is 26-28 ℃, the casting speed of a continuous casting machine is controlled at 3.8m/min, the melting point of the casting powder used by the crystallizer is 1050 ℃, the alkalinity is 0.90, the viscosity is 0.25 P.S, and the secondary cooling adopts a weak cooling mode with the specific water amount of 0.95L/kg steel. And stirring the interior of the casting blank by adopting a crystallizer electromagnetic stirring and tail end stirring technology (electromagnetic stirring parameters are 400A of current and 3Hz of frequency, and tail end electromagnetic stirring parameters are 450A of current and 7Hz of frequency).
(4) A hot rolling procedure: conveying speed of a straight rolling roller way: 2.6m/s, the head temperature of a rough rolling initial rolling casting blank is 968 ℃, the tail temperature is 912 ℃, and the thickness is 165 x 165mm 2 After 16 passes of rough, medium and fine rolling, the square billet is rolled into a round bar with the diameter of 20 mm.
The wear-resistant round rod for the agricultural machine has the following properties: tensile strength 562MPa, yield strength 430MPa, elongation a:30 percent; the surface of the product has no defects of cracks, scars and the like, and the structure is ferrite plus pearlite and is fine and uniform.
Example 3
The diameter of the wear-resistant round rod product for the agricultural machinery is phi 22mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the wear-resistant round rod product for the agricultural machinery comprises the steps of converter smelting, argon blowing wire feeding at an argon blowing station, square billet continuous casting, hot rolling and cold bed cutting and bundling, and the specific production process comprises the following steps:
(1) Smelting in a converter: and (3) charging molten iron into the furnace, wherein S:0.024%, P:0.118%; lime and light-burned dolomite are adopted for slagging, 38.6kg/t of lime is added, and 19kg/t of light-burned dolomite is added; 2.5kg/t of copper plate and 0.85kg/t of electrolytic nickel are added along with the scrap steel; and (3) finishing the converter: c:0.052%, P:0.018%; adding steel grit aluminum for deoxidation alloying in the tapping process, and adding 15kg/t of silicon-manganese alloy and 11kg/t of high-carbon ferrochrome.
(2) Blowing argon after the furnace: feeding Al wires to adjust the Al content in the steel, stirring and statically blowing argon for 6min, and keeping the station-out temperature of an argon blowing station at 1600 ℃; the chemical compositions and the mass percentage contents of the molten steel discharged from the argon blowing station are shown in the table 1.
(3) A square billet continuous casting process: the superheat degree of molten steel in a tundish is 20-28 ℃, the drawing speed of a continuous casting machine is controlled at 3.7m/min, the melting point of casting powder used by a crystallizer is 1050 ℃, the alkalinity is 0.90, the viscosity is 0.25 P.S, and the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.85L/kg of steel. And stirring the interior of the casting blank by adopting a crystallizer electromagnetic stirring and tail end stirring technology (electromagnetic stirring parameters: current 420A and frequency 4Hz, and tail end electromagnetic stirring parameters: current 460A and frequency 8 Hz).
(4) A hot rolling procedure: conveying speed of a straight rolling roller way: 2.5m/s, the head temperature of the rough rolling initial rolling casting blank is 966 ℃, the tail temperature is 909 ℃, and the temperature is 165 x 165mm 2 After 16 times of rough, medium and fine rolling, the square billet is rolled into a round bar with the diameter of 22 mm.
The wear-resistant round rod for the agricultural machine has the following properties: tensile strength 562MPa, yield strength 443MPa, elongation a:31 percent; the surface of the product has no defects of cracks, scars and the like, and the structure is ferrite plus pearlite and is fine and uniform.
Example 4
The diameter of the wear-resistant round rod product for the agricultural machinery is phi 25mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the wear-resistant round rod product for the agricultural machinery comprises the steps of converter smelting, argon blowing wire feeding at an argon blowing station, square billet continuous casting, hot rolling and cold bed cutting and bundling, and the specific production process comprises the following steps:
(1) Smelting in a converter: and (3) charging molten iron into the furnace, wherein S:0.022%, P:0.124 percent; adopting lime and light-burned dolomite for slagging, adding 40kg/t of lime and 15kg/t of light-burned dolomite; 2.7kg/t of copper plate and 0.86kg/t of electrolytic nickel are added along with the scrap steel; and (3) finishing the converter: c:0.052%, P:0.016 percent; during tapping, steel sand aluminum is added for deoxidation alloying, and 15kg/t of silicon-manganese alloy and 11kg/t of high-carbon ferrochrome are added.
(2) Blowing argon after the furnace: feeding Al wires to adjust the Al content in the steel, stirring and statically blowing argon for 8min, and keeping the outlet temperature of an argon blowing station at 1600 ℃; the chemical compositions and the mass percentage of the molten steel discharged from the argon blowing station are shown in the table 1.
(3) A square billet continuous casting process: the superheat degree of molten steel in a tundish is 20-30 ℃, the drawing speed of a continuous casting machine is controlled at 3.8m/min, the melting point of casting powder used by a crystallizer is 1050 ℃, the alkalinity is 0.90, the viscosity is 0.25 P.S, and the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.80L/kg of steel. And stirring the interior of the casting blank by adopting a crystallizer electromagnetic stirring and tail end stirring technology (electromagnetic stirring parameters: current 450A and frequency 5Hz, and tail end electromagnetic stirring parameters: current 480A and frequency 10 Hz).
(4) A hot rolling procedure: conveying speed of a direct rolling roller way: 3.0m/s, the head temperature of a rough rolling initial rolling casting blank is 971 ℃, the tail temperature is 922 ℃, and the temperature is 165 x 165mm 2 After 16 passes of rough, medium and fine rolling, the square billet is rolled into a round bar with the diameter of 25 mm.
The wear-resistant round rod for the agricultural machine has the following properties: tensile strength 554MPa, yield strength 423MPa, elongation a:30.5 percent; the surface of the product has no defects of cracks, scars and the like, and the structure is ferrite plus pearlite and is fine and uniform.
Example 5
The diameter of the wear-resistant round rod product for the agricultural machinery is phi 18mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the wear-resistant round rod product for the agricultural machinery comprises the steps of converter smelting, argon blowing wire feeding at an argon blowing station, square billet continuous casting, hot rolling and cold bed cutting and bundling, and the specific production process comprises the following steps:
(1) Smelting in a converter: and (3) charging molten iron into the furnace, wherein S:0.028%, P:0.121 percent; lime and light-burned dolomite are adopted for slagging, 38kg/t of lime is added, and 20kg/t of light-burned dolomite is added; adding 4.0kg/t of copper plate and 1.1kg/t of electrolytic nickel along with scrap steel; and (3) finishing the converter: c:0.040%, P:0.012%; during tapping, steel grit aluminum is added for deoxidation alloying, and 17kg/t of silicon-manganese alloy, 15kg/t of high-carbon ferrochrome and 1.9kg/t of ferrosilicon are added.
(2) Blowing argon after the furnace: feeding Al wires to adjust the Al content in the steel, stirring and statically blowing argon for 6min, and keeping the station outlet temperature of an argon blowing station at 1585 ℃; the chemical compositions and the mass percentage of the molten steel discharged from the argon blowing station are shown in the table 1.
(3) A square billet continuous casting process: the superheat degree of the molten steel of the tundish is 15-25 ℃, the drawing speed of a continuous casting machine is controlled at 3.6m/min, the melting point of the casting powder used by the crystallizer is 1030 ℃, the alkalinity is 1.00, the viscosity is 0.20 P.S, and the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.70L/kg of steel. And stirring the interior of the casting blank by adopting a crystallizer electromagnetic stirring and tail end stirring technology (electromagnetic stirring parameters: current 420A and frequency 3Hz, and tail end electromagnetic stirring parameters: current 450A and frequency 7 Hz).
(4) A hot rolling procedure: conveying speed of a straight rolling roller way: 3.5m/s, the head temperature of the rough rolling initial rolling casting blank is 960 ℃, the tail temperature is 900 ℃, and the temperature is 165 x 165mm 2 After 16 passes of rough, medium and fine rolling, the square billet is rolled into a round bar with the diameter of 18 mm.
The wear-resistant round rod for the agricultural machine has the following properties: tensile strength 608MPa, yield strength 486MPa, elongation a:27%; the surface of the product has no defects of cracks, scars and the like, and the structure is ferrite plus pearlite and is fine and uniform.
Example 6
The diameter of the wear-resistant round rod product for the agricultural machinery is phi 25mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the wear-resistant round rod product for the agricultural machinery comprises the steps of converter smelting, argon blowing wire feeding at an argon blowing station, square billet continuous casting, hot rolling and cold bed cutting and bundling, and the specific production process comprises the following steps:
(1) Smelting in a converter: and (3) charging molten iron into the furnace, wherein S:0.040%, P:0.140 percent; lime and light-burned dolomite are adopted for slagging, 30kg/t of lime is added, and 20kg/t of light-burned dolomite is added; 2.0kg/t of copper plate and 0.5kg/t of electrolytic nickel are added along with scrap steel; and (3) finishing the converter: c:0.10%, P:0.020%; steel grit aluminum is added for deoxidation alloying in the tapping process, wherein the silicon-manganese alloy accounts for 12.2kg/t, and the high-carbon ferrochrome accounts for 9.3kg/t.
(2) Blowing argon after the furnace: feeding Al wires to adjust the Al content in the steel, stirring and statically blowing argon for 5min, and keeping the outlet temperature of an argon blowing station at 1610 ℃; the chemical compositions and the mass percentage of the molten steel discharged from the argon blowing station are shown in the table 1.
(3) A square billet continuous casting process: the superheat degree of the molten steel of the tundish is 27-35 ℃, the drawing speed of a continuous casting machine is controlled at 4.0m/min, the melting point of the casting powder used by the crystallizer is 1150 ℃, the alkalinity is 0.80, the viscosity is 0.40 P.S, and the secondary cooling adopts a weak cooling mode, and the specific water amount is 1.00L/kg of steel. And stirring the interior of the casting blank by adopting a crystallizer electromagnetic stirring and tail end stirring technology (electromagnetic stirring parameters: current 420A and frequency 3Hz, and tail end electromagnetic stirring parameters: current 450A and frequency 7 Hz).
(4) A hot rolling procedure: conveying speed of a straight rolling roller way: 2.9m/s, the head temperature of a rough rolling initial rolling casting blank is 966 ℃, the tail temperature is 918 ℃, and the temperature is 165 x 165mm 2 After 16 passes of rough, medium and fine rolling, the square billet is rolled into a round bar with the diameter of 25 mm.
The wear-resistant round rod for the agricultural machine has the following properties: tensile strength 515MPa, yield strength 402MPa, elongation A:32 percent; the surface of the product has no defects of cracks, scars and the like, and the structure is ferrite plus pearlite and is fine and uniform.
Table 1 chemical composition and mass% of the abrasion-resistant round bar in examples 1 to 5
In table 1, the balance of chemical components is Fe and inevitable impurities.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The production method of the wear-resistant round rod for the agricultural machinery is characterized by comprising the steps of converter smelting, argon blowing after the converter, square billet continuous casting, hot rolling and cooling and bundling by a cooling bed;
in the post-furnace argon blowing process, the chemical components and the mass percentage of the molten steel discharged from the argon blowing station are controlled as follows: c:0.15 to 0.020%, mn:0.80 to 1.10%, si: 0.20-0.40%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, al:0.020 to 0.050%, cr:0.50-0.80%, cu:0.20 to 0.40%, ni:0.070 to 0.110 percent, and the balance of Fe and inevitable impurities;
in the square billet continuous casting process, a crystallizer is adopted to perform electromagnetic stirring and tail end electromagnetic stirring, and the electromagnetic stirring parameters are as follows: the current is 380-450A, and the frequency is 2-5Hz; parameters of the electromagnetic stirring at the tail end: the current is 420-480A, and the frequency is 5-10Hz; the superheat degree of the molten steel of the tundish is 15-35 ℃, the casting speed of a continuous casting machine is controlled to be 3.6-4.0 m/min, the melting point of the casting powder used by the crystallizer is 1030-1150 ℃, the alkalinity is 0.80-1.00, the viscosity is 0.20-0.40 P.S, the secondary cooling adopts a medium-weak cooling mode, and the specific water amount is 0.7-1.0L/kg of steel;
the hot rolling procedure adopts a heating-free direct rolling technology without a casting blank heating link, a high-speed conveying scheme and a whole-process heat preservation technology are adopted in a direct rolling roller way, and the conveying speed of the direct rolling roller way is as follows: 2-3.5m/s; the head temperature of a rough rolling initial rolling casting blank is not less than 960 ℃, and the head-tail temperature difference is not more than 60 ℃; after the square billet is subjected to rough-medium-finish rolling, a round bar product with the diameter phi of 18-25mm is obtained.
2. The production method of the wear-resistant round rod for the agricultural machinery as claimed in claim 1, wherein in the converter smelting process, S is less than or equal to 0.040% and P is less than or equal to 0.140% in molten iron entering a furnace; lime and light-burned dolomite are adopted for slagging, 30-40 kg/t of lime is added, and 15-20 kg/t of light-burned dolomite is added; adding 2.0-4.0 kg/t copper plate and 0.5-1.1 kg/t electrolytic nickel into the scrap steel, adding silicon-manganese alloy and high-carbon ferrochrome into the furnace, and alloying the converter, wherein the end point is as follows: the carbon content is 0.04-0.10%, and the phosphorus content P is less than or equal to 0.020%.
3. The production method of the wear-resistant round rod for the agricultural machinery as claimed in claim 1 or 2, wherein in the argon blowing process after the furnace, al is added for final deoxidation, and the static blowing time is 5-8 min; the outlet temperature of the argon blowing station is 1585-1610 ℃.
4. The method for producing a wear-resistant round bar for agricultural machinery according to claim 1 or 2, wherein the structure of the wear-resistant round bar is ferrite + pearlite.
5. The method for producing the wear-resistant round bar for the agricultural machinery as claimed in claim 4, wherein the mechanical properties Rm of the wear-resistant round bar are as follows: 500-630MPa, rel is more than or equal to 355MPa, and the elongation A is more than or equal to 25 percent.
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