CN112458378B - Production method of high-strength hot-rolled coiled plate for soil contact accessory of agricultural implement - Google Patents
Production method of high-strength hot-rolled coiled plate for soil contact accessory of agricultural implement 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/04—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses a production method of a high-strength hot-rolled coil for an agricultural implement soil-contacting accessory, which adopts a TSR furnace full molten iron smelting production method and a steckel mill and a three-stand continuous rolling line to roll high-strength steel, and comprises the following steps: 1) molten iron dephosphorization process and full molten iron smelting in a TSR furnace are adopted, argon is used in the whole bottom blowing process during the blowing in the TSR furnace, and steel is discharged to a steel ladle after the mass ratio of the components of the molten steel reaches the preset requirement; 2) LF refining; 3) a continuous casting process; 4) a slab descaling process; 5) heating in a heating furnace; 6) rough rolling process; 7) a finish rolling process; 8) a coiling process; the high-strength manganese boron alloy steel hot rolled steel strip obtained by the invention has the advantages that the room temperature structure is fine ferrite plus sorbite plus a small amount of martensite, the toughness and the plasticity are good, the subsequent processing and the formability are good, the tensile strength Rm is more than or equal to 620Mpa, the elongation is more than 22%, the impact energy is more than 55J, and the toughness and the plasticity of the hot rolled plate are all superior to those of conventional cutting tool steel plates such as 65Mn and the like.
Description
Technical Field
The invention relates to the technical field of steel-making metallurgy, in particular to a production method of a high-strength hot-rolled coil for an agricultural implement soil-contacting accessory.
Background
The manganese boron alloy steel has the characteristics of low hardness, good plasticity, easy cutting processing or cold processing and the like, can be used for processing complex parts, and is mainly used as a wear-resistant material in the fields of shovels, saw blades, agricultural machinery of agricultural implement accessories, rake blades and the like.
At present, the steel for saw blades and farm machinery soil contact fittings-harrow plates is generally prepared by adopting 65Mn hot rolled strip steel, oil quenching at 850-910 ℃ and tempering at 300-400 ℃. Because of the high carbon content, the strength and the hardness are higher, but the carbon content also has the defects of high brittleness and poor plasticity and toughness.
Compared with the traditional high-strength steel or advanced high-strength steel, the hot-stamping formed manganese-boron alloy steel has the advantages that the strength is greatly improved, the total elongation is greatly reduced, and the possibility of further improving the comprehensive performance is still provided. The difficulty of improving the service strength of the hot stamping formed boron steel lies in how to ensure good elongation and yield ratio while improving the strength and improve the oxidation resistance of the steel at short time and high temperature. In general, as the strength of martensitic steel increases, the elongation of the material decreases. In order to ensure that the hot stamping formed manganese-boron alloy steel has high elongation and high-temperature oxidation resistance, the high elongation and yield ratio are ensured while the strength is considered to be improved in the aspects of material component fine adjustment and process design. Therefore, a production method of a high-strength hot-rolled coiled plate for an agricultural implement soil-contacting fitting is urgently needed to solve the problems of low elongation and yield ratio and the like caused by high use strength of boron steel formed by hot stamping.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a production method of a high-strength hot-rolled coil for an agricultural implement soil-contacting accessory.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of a high-strength hot-rolled coil for an agricultural implement soil-contacting accessory adopts a TSR furnace full molten iron smelting production method, a steckel mill and a three-stand continuous rolling line to roll high-strength steel, and adopts steel components with the weight ratio of C: 0.28% -0.32%, Si: 0.20% -0.30%, Mn: 1.20% -1.30%, P: less than or equal to 0.02 percent, S: less than or equal to 0.05 percent, B: 0.002% -0.0035%, Cr: 0.30% -0.40%, V: 0.01% -0.02%, Ti: 0.02% -0.04%, Als: 0.03% -0.05%, comprising the following steps:
1) molten iron dephosphorization process and full molten iron smelting in a TSR furnace are adopted, argon is used in the whole bottom blowing process during the blowing in the TSR furnace, and after the mass ratio of the components of the molten steel reaches the preset requirement, the molten steel is discharged to a steel ladle to obtain reduced molten steel;
2) LF refining: finely adjusting components, making white slag, adding sponge titanium and ferroboron before soft blowing, sampling and detecting, after the components meet the control requirements, soft blowing argon for 10-20 min, controlling the oxygen content of LF to be less than 10ppm, and discharging molten steel after the components meet the component proportion requirements and the temperature reaches the preset requirements, wherein the temperature is 1560-1600 ℃;
3) the continuous casting process comprises the following steps: when the molten steel reaches the continuous casting process, calming for 5-15 min, adopting argon protective pouring in the whole continuous casting process, pulling at the speed of 0.90-1.0 m/min, and producing a casting blank by using electromagnetic stirring;
4) the slab descaling process comprises the following steps: in order to reduce the temperature drop of a rolling line of a plate blank rolling, the descaling pass needs to be reduced, and the descaling scheme is as follows: removing the scale of the slab by a scale removing box for one time, and carrying out scale removal on a rough rolling frame for 1 or 3 times;
5) heating by a heating furnace: the charging temperature is not lower than 500 ℃, the standing time is 150-190 min, the hearth atmosphere is a weak reducing atmosphere, and the heating temperature is 1210-1250 ℃;
6) the rough rolling process comprises the following steps: rough rolling is carried out for 7 times, the first-time reduction rate is less than or equal to 20 percent, and the tissue production is carried out according to slow discharging, fast rolling and high-temperature rush rolling;
7) finish rolling process: the finish rolling adopts a steckel mill and 3-frame continuous rolling mode, a finish descaling box is not used, the temperature of a coiling furnace is controlled at 1150 +/-10 ℃, the temperature of the rough rolling and the finish rolling is 1050-1150 ℃, the temperature of the finish rolling and the initial rolling is 1020-1060 ℃, the temperature of the finish rolling and the finish rolling is 880 +/-20 ℃, and laminar cooling is not used;
8) and (3) a coiling process: after rolling, the layer cooling section is adopted to not spray water, and the phenomenon of cooling water leakage is strictly forbidden in the layer cooling section.
Specifically, the predetermined requirements for the molten steel component mass ratio in the step 1 are that P is less than or equal to 0.005%, C: 0.28 to 0.30 percent.
Specifically, the amount of the sponge titanium added before the soft blowing in the step 2 is 40 kg/furnace, the amount of the ferroboron is 50 kg/furnace, and the molten steel prepared by the LF ladle refining process has low sulfur and phosphorus content, P is less than or equal to 0.005%, S is less than or equal to 0.005%, oxygen and nitrogen content is low, the purity of the molten steel is high, sigma [ O ] is less than or equal to 0.003%, and sigma [ N ] is less than or equal to 0.0035%.
Specifically, the descaling scheme of the step 4 ensures that the pressure of the descaling water is required to be over 22.0 MPa.
Specifically, in the rough rolling process in the step 6, in order to reduce the temperature drop of the steel strip, the cooling water system of the roller is adjusted before rolling, the rough rolling dedusting water is closed, the cooling water of the roller way is closed, and water cannot splash onto the surface of the steel strip.
Specifically, in the finish rolling process in the step 7, in order to prevent the band steel from generating cracks during finish rolling, water spraying at the side of each stand for finish rolling is closed, and cooling water of the roller is strictly prevented from leaking onto the surface of the band steel during rolling.
Specifically, the layer cooling section in the step 8 does not spray water, so that the cooling water for the pinch roll of the coiling machine is small, the cooling water cannot flow to the surface of the steel strip, the coiling temperature is controlled within the range of 700-800 ℃, the steel strip is directly hung to a slow cooling area for cooling for 72 hours after being taken off line and bundled for three times, and other types of steel strips are stacked on the periphery for slow cooling, so that the uneven hardness of the steel strip is prevented.
The invention has the following beneficial effects:
the production method of the high-strength hot-rolled coiled plate for the soil-contacting accessory of the agricultural implement, which is designed by the invention, can directly process saw blades, harrow plates and the like after acid washing without cover annealing, and the following two points need to be controlled in the production process: firstly, the coiling temperature is controlled, the steel strip is ensured to have certain high-temperature self-tempering time, the decomposition of martensite structure is promoted, and the hardness of the steel strip is reduced; secondly, the temperature difference between the head, the tail and the edge of the steel strip is reduced as much as possible in the rolling process, and the steel strip is quickly hoisted to a specified position after being coiled, so that the phenomenon of uneven hardness of the steel strip is avoided; the high-strength manganese boron alloy steel hot rolled steel strip obtained by adopting the chemical components and the hot rolling process has the advantages that the room temperature structure is fine ferrite, sorbite and a small amount of martensite, the toughness and the plasticity are good, the subsequent processing formability is good, the tensile strength Rm is not less than 620Mpa, the elongation is more than 22%, the impact energy is more than 55J, and the toughness and the plasticity of a hot rolled plate are all superior to those of conventional cutting tool steel plates such as 65 Mn.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely further detailed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A production method of a high-strength hot-rolled coil plate for an agricultural implement soil-contacting accessory adopts a TSR furnace full molten iron smelting production method, a hot rolling process of rolling high-strength steel by a steckel mill and a three-stand continuous rolling line, and a production method of high-strength and high-toughness steel for the agricultural implement soil-contacting accessory of an innovative heat treatment process, and adopts steel materials with the weight ratio of C: 0.28% -0.32%, Si: 0.20% -0.30%, Mn: 1.20% -1.30%, P: less than or equal to 0.02 percent, S: less than or equal to 0.05 percent, B: 0.002% -0.0035%, Cr: 0.30% -0.40%, V: 0.01% -0.02%, Ti: 0.02% -0.04%, Als: 0.03% -0.05%, comprising the following steps:
(1) the molten iron dephosphorization process and the full molten iron smelting in the TSR furnace are adopted, argon is used in the whole process of bottom blowing during the blowing in the TSR furnace, the nitrogen increase is prevented, and after the mass ratio of the components of the molten steel reaches the preset requirement, the method is that: p is less than or equal to 0.005 percent, C: 0.28 to 0.30 percent of steel is tapped to a ladle to obtain reduced molten steel;
(2) and LF refining: finely adjusting components, making white slag, adding titanium sponge, ferroboron and titanium sponge before soft blowing: 40 kg/furnace, ferroboron: sampling and detecting 50 kg/furnace, soft blowing argon for 10-20 min after the components meet the control requirement, controlling the content of oxygen in LF to be less than 10ppm, discharging molten steel after the components of the molten steel meet the component proportion requirement and the temperature reaches the preset requirement, wherein the temperature is 1560-1600 ℃, and the molten steel prepared by the LF ladle refining process has low sulfur and phosphorus content, P is less than or equal to 0.005%, S is less than or equal to 0.005%, oxygen and nitrogen content is low, the purity of the molten steel is high, sigma [ O ] is less than or equal to 0.003%, and sigma [ N ] is less than or equal to 0.0035%;
(3) and the continuous casting process comprises the following steps: when the molten steel reaches the continuous casting process, calming for 5-15 min, adopting argon protective pouring in the whole continuous casting process, pulling at the speed of 0.90-1.0 m/min, and producing a casting blank by using electromagnetic stirring;
(4) and a slab descaling process: in order to reduce the temperature drop of a rolling line of a plate blank rolling, the descaling passes need to be reduced, the descaling passes are reasonably distributed, and the scale is effectively removed, a special descaling scheme is adopted: the method comprises the following steps of (1) removing one step (2 groups) by a slab descaling box, using a roughing mill frame for descaling for 1 and 3 times, and simultaneously ensuring that the descaling water pressure and the water quantity meet certain conditions in the test and the descaling water pressure of each point is required to be 22.0 MPa;
(5) heating by using a heating furnace: the charging temperature is not lower than 500 ℃, the standing time is 150-190 min, the hearth atmosphere is a weak reducing atmosphere, and the heating temperature is 1210-1250 ℃;
(6) and rough rolling process: rough rolling for 7 passes, wherein the first pass reduction rate is less than or equal to 20%, the steel strip is produced according to the organization of slow-discharging, fast-rolling and high-temperature rush-rolling, in order to reduce the temperature drop of the steel strip, a roller cooling water system is adjusted before rolling, rough rolling dedusting water is closed, roller bed cooling water is closed to be small, and water cannot splash to the surface of the steel strip;
(7) and a finish rolling process: the finish rolling adopts a steckel mill and 3-frame continuous rolling mode, a finish descaling box is not used, the temperature of a coiling furnace is controlled to 1150 +/-10 ℃, the temperature of the rough rolling and the finish rolling is 1050-1150 ℃, the temperature of the finish rolling and the initial rolling is 1020-1060 ℃, the temperature of the finish rolling is 880 +/-20 ℃, laminar cooling is not used, in order to prevent the band steel from generating cracks during the finish rolling, the water spray at the side of each frame of the finish rolling is closed, and the cooling water of a roller is strictly forbidden to be poured on the surface of the band steel during the rolling;
(8) and a coiling process: after rolling, no water is sprayed in a layer cooling section, the phenomenon of cooling water leakage is avoided in the layer cooling section, the cooling water of a pinch roll of a coiling machine is small, the cooling water cannot flow to the surface of a steel strip, the coiling temperature is controlled within the range of 700-800 ℃, the steel strip is directly hung to a slow cooling area for cooling for 72 hours after being rolled off and bundled, and other types of steel strips are stacked on the periphery for slow cooling, so that the steel strip is prevented from being uneven in hardness.
The manganese boron alloy steel produced by the traditional process has high strength and hardness and large brittleness, so that subsequent processing cannot be directly carried out, and softening treatment is required. The method does not need cover annealing, directly processes the saw blade, the harrow plate and the like after acid washing, and the following two points need to be controlled in the production process: firstly, the coiling temperature is controlled, the steel strip is ensured to have certain high-temperature self-tempering time, the decomposition of martensite structure is promoted, and the hardness of the steel strip is reduced; secondly, the temperature difference of the head, the tail and the edge of the steel strip is reduced as much as possible in the rolling process, and the steel strip is quickly hoisted to a specified position after being reeled, so that the phenomenon of uneven hardness of the steel strip is avoided.
The high-strength manganese boron alloy steel hot rolled steel strip obtained by adopting the chemical components and the hot rolling process has the advantages that the room temperature structure is fine ferrite plus sorbite plus a small amount of martensite, the toughness and the plasticity are good, the subsequent processing formability is good, the tensile strength Rm is not less than 620Mpa, the elongation reaches more than 22%, the impact energy is more than 55J, and the toughness and the plasticity of the hot rolled plate are all superior to those of conventional cutting tool steel plates such as 65 Mn.
Examples 1 to 6: the chemical component content of the hot-rolled coil for the agricultural implement soil-contacting accessory is shown in table 1; the specific process parameters of each example are shown in Table 2; the mechanical properties of the high-strength steel strips obtained in the batches of the examples are shown in table 3 according to the component contents in table 1 and the process parameters in table 2.
Table 1: chemical component content (wt%) of each example
Table 2: process parameters of the examples
Table 3: mechanical properties of the rolled sheet obtained in each example
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (3)
1. A production method of a high-strength hot-rolled coil for an agricultural implement soil-contacting accessory is characterized in that a TSR furnace full molten iron smelting production method, a steckel mill and a three-stand continuous rolling line are adopted to roll high-strength steel, and the weight ratio of components of steel is C: 0.28% -0.32%, Si: 0.20% -0.30%, Mn: 1.20% -1.30%, P: less than or equal to 0.02 percent, S: less than or equal to 0.05 percent, B: 0.002% -0.0035%, Cr: 0.30% -0.40%, V: 0.01% -0.02%, Ti: 0.02% -0.04%, Als: 0.03% -0.05%, comprising the following steps:
1) molten iron dephosphorization process and full molten iron smelting in a TSR furnace are adopted, argon is used in the whole bottom blowing process during the blowing in the TSR furnace, and after the mass ratio of the components of the molten steel reaches the preset requirement, the molten steel is discharged to a steel ladle to obtain reduced molten steel;
2) LF refining: finely adjusting components, making white slag, adding 40kg of sponge titanium and 50kg of ferroboron before soft blowing, and carrying out LF ladle refining to obtain molten steel with low sulfur and phosphorus content, less than or equal to 0.005 percent of P, less than or equal to 0.005 percent of S, low oxygen and nitrogen content, high purity of the molten steel, less than or equal to 0.003 percent of Sigma [ O ], less than or equal to 0.0035 percent of Sigma [ N ], sampling and detecting, after the components meet the control requirements, soft blowing argon for 10-20 min, controlling the oxygen content of LF to be less than 10ppm, and after the components meet the component proportion requirements and the temperature reaches the preset requirements, discharging the molten steel at the temperature of 1560-1600 ℃;
3) the continuous casting process comprises the following steps: when the molten steel reaches the continuous casting process, calming for 5-15 min, adopting argon protective pouring in the whole continuous casting process, pulling at the speed of 0.90-1.0 m/min, and producing a casting blank by using electromagnetic stirring;
4) the slab descaling process comprises the following steps: in order to reduce the temperature drop of a rolling line of a plate blank rolling, the descaling pass needs to be reduced, and the descaling scheme is as follows: removing one time by a slab descaling box, and carrying out descaling on a rough rolling frame in the 1 st pass and the 3 rd pass;
5) heating by a heating furnace: the charging temperature is not lower than 500 ℃, the standing time is 150-190 min, the hearth atmosphere is a weak reducing atmosphere, and the heating temperature is 1210-1250 ℃;
6) the rough rolling process comprises the following steps: rough rolling for 7 passes, wherein the first pass reduction rate is less than or equal to 20%, the steel strip is produced according to the organization of slow-discharging, fast-rolling and high-temperature rush-rolling, in order to reduce the temperature drop of the steel strip, a roller cooling water system is adjusted before rolling, rough rolling dedusting water is closed, roller bed cooling water is closed to a small extent, and water cannot splash to the surface of the steel strip;
7) finish rolling process: the finish rolling adopts a Steckel mill and 3-frame continuous rolling mode, a finish descaling box is not used, the temperature of a coiling furnace is controlled at 1150 +/-10 ℃, the temperature of the rough rolling and the finish rolling is 1050 ℃ -1150 ℃, the temperature of the finish rolling and the initial rolling is 1020 ℃ -1060 ℃, the temperature of the finish rolling and the finish rolling is 880 +/-20 ℃, laminar cooling is not used, in order to prevent the band steel from generating cracks during the finish rolling, the water spray at the side of each frame of the finish rolling is closed, and the cooling water of a roller is strictly forbidden to be poured and leaked on the surface of the band steel during the rolling;
8) and (3) a coiling process: after rolling, no water is sprayed in a layer cooling section, the phenomenon of cooling water leakage is avoided in the layer cooling section, the cooling water of a pinch roll of a coiling machine is small, the cooling water cannot flow to the surface of a steel strip, the coiling temperature is controlled within the range of 700-800 ℃, the steel strip is directly hung to a slow cooling area for cooling for 72 hours after being rolled off and bundled, and other types of steel strips are stacked on the periphery for slow cooling, so that the steel strip is prevented from being uneven in hardness.
2. The method for producing the high-strength hot-rolled coil for the agricultural implement soil-contacting fitting part according to claim 1, wherein the predetermined requirements for the mass ratio of the molten steel components in the step 1) are that P is less than or equal to 0.005%, C: 0.28 to 0.30 percent.
3. The method for producing the high-strength hot-rolled coiled plate for the agricultural implement soil-contacting accessory according to claim 1, wherein the descaling scheme of the step 4) ensures that the pressure of the descaling water is required to be more than 22.0 MPa.
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| CN106086683A (en) * | 2016-08-24 | 2016-11-09 | 武汉钢铁股份有限公司 | By tensile strength >=1700MPa thin hot forming steel and the production method of sheet billet Direct Rolling |
| CN107587070A (en) * | 2017-09-15 | 2018-01-16 | 河钢股份有限公司承德分公司 | Hot rolling broadband leaf spring steel and its production method |
| CN107893188A (en) * | 2017-12-20 | 2018-04-10 | 山东泰山钢铁集团有限公司 | A kind of smelting process of high intensity manganese-boron steel |
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