CN111809106A - Rare earth microalloyed 650CL wheel steel and production method thereof - Google Patents
Rare earth microalloyed 650CL wheel steel 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/10—Handling in a vacuum
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- 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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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- 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
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
Abstract
The invention discloses rare earth microalloyed 650CL steel for a wheel, which comprises the following chemical components in percentage by mass: 0.06-0.08% of C, 0.05-0.15% of Si, 1.40-1.80% of Mn, less than 0.025% of P, less than 0.015% of S, 0.035-0.070% of Nb, 0.035-0.070% of Ti, 0.020-0.055% of Alt, 0.0010-0.0040% of Ca, 0.0010-0.0050% of Ce, and the balance of iron element and inevitable impurities. Its preparing process is also disclosed. The thickness of the steel for the wheel is 1.6-18mm, the yield strength of the steel is 500-650KPa, the tensile strength is 650-770KPa, and the elongation is more than or equal to 18.0%.
Description
Technical Field
The invention relates to the field of hot-rolling cold-working forming steel, in particular to rare earth microalloying 650CL wheel steel and a production method thereof.
Background
Along with the implementation of relevant overload regulations of trucks in China, the development demand of light weight of the trucks is stronger, the steel for the wheels with low grade and thick specification is replaced by the steel with high strength and thin specification, the thickness of the steel for the wheels and the quality of parts are effectively reduced by improving the strength grade of the steel for the wheels, and the demand of the steel for the wheels with thin specification and high strength is more and more large from the market demand. Rare earth has the functions of purifying molten steel, modifying inclusions, microalloying and the like in steel, a small amount of rare earth alloy is added into the steel, and the microalloying of the rare earth effectively improves the corrosion resistance of a steel strip, improves the low-temperature impact, resists fatigue and refines crystal grains, is convenient for controlling the cleanliness of steel and prolongs the service life of the steel; the rare earth oxide has high melting point, can effectively inhibit the growth of crystal grains in the welding process and improve the welding performance of the wheel. Because the rare earth microalloyed 650CL wheel steel has low temperature resistance and fatigue resistance, the rare earth microalloyed high-strength wheel can be applied to complex road conditions and low-temperature environments, the service life of the rare earth wheel is prolonged, and the purchase cost of a wheel manufacturer is reduced. The 1.6-18mm 650CL hot-rolled rare earth wheel steel can be widely applied to manufacturing of wheels of medium-sized heavy-duty load-bearing vehicles and the like. At present, application tests of 650CL rare earth wheel steel are carried out, load fatigue tests are more than 100 ten thousand times, the market prospect is good, and the effect of each ton of steel can be expected to be increased by more than 600 yuan.
Through the search of patent 1: the Chinese patent with the application number of CN109023087A discloses wheel steel with tensile strength of 650MPa grade and good post-welding formability and a production method thereof, wherein the Mn content in the component design is 1.20-1.40%, but the component design does not contain Ti element and rare earth Ce element, and the microstructure contains harder bainite; the design range of relevant components in the patent is as follows: 1.40-1.80%, Ti 0.035-0.075%, Ce: 0.0010-0.0050 percent, and the hot rolling finishing temperature of 820-. The composition design and the finish rolling temperature of the application patent and the retrieval patent 1 are different, the manganese content of the application patent is controlled to be higher, and Ti alloy and rare earth Ce alloy are added; the final rolling temperature is 850-; therefore, the composition design and the hot finish rolling temperature are different.
Search for related document 2: the contents of Nb and Ti in the chemical composition design of the C490CL high-strength wheel steel are not specified clearly, and the steel does not contain rare earth Ce element. The patent Nb: 0.035-0.70%, Ti 0.035-0.070%, Ce: 0.0010-0.0050%, and different component system designs.
In the related document 3, the steel strip 490CL for a wheel contains no Nb, Ti and rare earth Ce elements in the chemical design components. The patent Nb: 0.035-0.070%, Ti 0.035-0.070%, Ce: 0.0010-0.0050%, and different component system designs.
Disclosure of Invention
The invention aims to solve the technical problem of providing high-strength rare earth 650CL wheel steel and a production method thereof, and the manufacturing process comprises the following steps: molten iron KR treatment → converter → LF refining → RH refining → casting machine → hot rolling → finished product; the method adopts a mode of rare earth microalloying, high cooling speed and low temperature final rolling to realize the required strength of the steel; the rare earth oxide generated by adding rare earth realizes grain refinement, and the requirement of high strength of the product is met; by virtue of the high-melting-point characteristic of the rare earth oxide, the growth of crystal grains in a welding heat affected zone is effectively inhibited, and the forming performance of the welded heat affected zone is finally improved; the low-temperature impact energy (more than 10mm) of the thick rare earth wheel steel is effectively improved by utilizing the metamorphic inclusion effect of the rare earth in the steel; by utilizing the strong stability of the rare earth oxide in the steel, the corrosion resistance of the product is effectively improved, and the service life of the product is prolonged. The thickness of the produced wheel steel is 1.6-18mm, the yield strength of the steel is 500-. The 650CL hot-rolled rare earth wheel steel can be widely applied to manufacturing of wheels of medium-sized and heavy-duty load-bearing vehicles. At present, 650CL rare earth wheel steel application tests are carried out, the load fatigue tests are more than 100 ten thousand times, the satisfaction degree of users on the product is high, and the product has good market prospect.
In order to solve the technical problems, the invention adopts the following technical scheme:
rare earth microalloyed 650CL wheel steel comprises the following chemical components in percentage by mass: 0.06-0.08% of C, 0.05-0.15% of Si, 1.40-1.80% of Mn, less than 0.025% of P, less than 0.015% of S, 0.035-0.070% of Nb, 0.035-0.070% of Ti, 0.020-0.055% of Alt, 0.0010-0.0040% of Ca, 0.0010-0.0050% of Ce, and the balance of iron element and inevitable impurities.
Further, the chemical components and the mass percentage thereof are as follows: 0.06-0.08% of C, 0.05-0.15% of Si, 1.45-1.60% of Mn, less than 0.018% of P, less than 0.005% of S, 0.055-0.065% of Nb, 0.045-0.055% of Ti, 0.020-0.050% of Alt, 0.0010-0.0040% of Ca, 0.0010-0.0050% of Ce, and the balance of iron element and inevitable impurities.
Further, the chemical components and the mass percentage thereof are as follows: 0.07% of C, 0.10% of Si, 1.69% of Mn, 0.011% of P, 0.001% of S, 0.057% of Nb, 0.051% of Ti, 0.042% of Alt, 0.0015% of Ca, 0.0016% of Ce, and the balance of iron and inevitable impurities.
Further, the chemical components and the mass percentage thereof are as follows: 0.07% of C, 0.10% of Si, 1.66% of Mn, 0.017% of P, 0.002% of S, 0.058% of Nb, 0.049% of Ti, 0.041% of Alt, 0.0016% of Ca, 0.0031% of Ce, and the balance of iron and inevitable impurities.
Further, the chemical components and the mass percentage thereof are as follows: 0.07% of C, 0.11% of Si, 1.70% of Mn, 0.012% of P, 0.001% of S, 0.056% of Nb, 0.053% of Ti, 0.038% of Alt, 0.0014% of Ca, 0.0045% of Ce, and the balance of iron and inevitable impurities.
A production method of rare earth microalloyed 650CL steel for wheels comprises the following steps: converter smelting, refining process, casting process, continuous casting billet heating, rolling, controlled cooling and coiling;
in order to improve the stable control of the yield of the Ce rare earth, a Ce-Fe alloy is required to be added in the process of smelting the billet, wherein the mass percent of Ce accounts for 10-30% of that of the added Ce-Fe alloy, the oxygen content in the added Ce-Fe alloy is less than or equal to 20ppm, and the Ce-Fe alloy adding station is positioned 3-8min before the RH vacuum treatment is finished;
in order to ensure the control of the lower sulfur content of the molten iron, the KR desulfurization treatment adopts deep desulfurization operation, the sulfur content of the molten iron is less than or equal to 0.001 percent when the desulfurization is finished, and the slag removing proportion on the surface of the molten iron tank is more than or equal to 95 percent;
in order to improve the cleanliness of molten steel and the yield of rare earth, the carbon content of components at the smelting end point of the converter needs to be controlled to be 0.04-0.06 percent, the target components need to be hit at the end point of the converter at one time, the end point of the converter is prevented from being controlled by adopting point blowing operation, the tapping temperature of the converter is controlled to be 1620-1660 ℃, the tapping of the converter is started and ended by adopting sliding plate slag stopping operation, and the converter slag is prevented from being put into a steel ladle;
in order to reduce the nitrogen increasing amount of molten steel and control the cleanliness of the molten steel in the LF refining process, the rotating speed of a dust removal fan needs to be adjusted in the LF heating process, the pressure in a smoke hood is ensured to be at micro positive pressure in the LF refining heating process, and external air is prevented from entering the smoke hood and contacting the molten steel; LF dislocation ensures that the S content in the molten steel is less than or equal to 0.005 percent; after LF refining treatment is finished, calcium treatment is carried out, a high-calcium wire is fed for 200-300 m in the calcium treatment process, the wire feeding speed is controlled to be 3-3.5 m/s in the calcium treatment process, and molten steel is blown for 5-8 min after the calcium treatment is finished;
in order to ensure the high cleanliness uniformity of molten steel and the stable control of the yield of high rare earth content, the setting range of the annular flow in the RH vacuum treatment process is 120m 3/min-150 m 3/min; the RH vacuum degree needs to be ensured to be less than 1.3mbar, and the deep vacuum treatment time is 20-25 min; adding cerium-iron alloy at the later stage of RH vacuum treatment, adding rare earth, circulating molten steel for 5min for repressing, and soft-blowing for 6-8 min after the vacuum treatment is finished;
argon is adopted for protection in the whole process of the tundish in the casting process of the casting machine, the slag discharge detection equipment is started in the ladle casting process, and the ladle slag is prevented from flowing into the tundish after the ladle casting is finished; the casting process of the casting machine is controlled by adopting a constant casting speed, the casting speed setting range is 1.1-1.6 m/min according to different casting sections, and the superheat degree of tundish casting is controlled at 20-35 ℃;
the slab is cooled for 36 hours and then released after passing the low-power inspection, the slab is put into a hot rolling heating furnace, the furnace time is 180-;
the rolling comprises rough rolling and finish rolling, wherein the rough rolling adopts a 2-stand rolling mill for rough rolling, and the finish rolling adopts a 7-stand continuous variable-crown rolling mill for finish rolling; the initial rolling temperature of the finish rolling is more than or equal to 950 ℃, and the final rolling temperature of the finish rolling is 850-910 ℃;
laminar flow continuous cooling equipment is adopted for cooling, a cooling code is set to be in a 12-mode, the upper-section cooling nozzle is separated by one, the lower-end cooling nozzle is separated by two, and the coiling temperature is 600-.
Compared with the prior art, the invention has the beneficial technical effects that:
the microstructure of the steel strip prepared by the invention is characterized by ferrite and pearlite, the mechanical property is high in specific point, yield and tensile strength, and the steel strip has the properties of good corrosion resistance, low-temperature impact energy resistance, fatigue resistance, easiness in welding, easiness in forming and the like, and is suitable for the manufacturing requirements of medium-sized and heavy-duty load-bearing vehicle wheels.
The yield strength of the steel strip for the 1.6-18mm 650CL rare earth microalloyed wheel prepared by the invention is distributed between 500MPa and 650MPa, the tensile strength is distributed between 650MPa and 770MPa, the elongation A80 is more than or equal to 18 percent, the yield ratio YS/TS is between 0.85 and 0.95, and the steel strip is qualified when the steel strip is subjected to 180-degree cold bending D which is 2.0 a.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a typical metallographic structure of an example of the present invention.
Detailed Description
Example one
Carrying out desulfurization pretreatment on molten iron, wherein the S content of the molten iron leaving a desulfurization KR station is 0.001%, and the temperature T of the molten iron is 1325 ℃; the molten iron is decarburized and dephosphorized by adopting a top-bottom combined blown converter to obtain molten steel, argon is blown in the whole smelting process of the converter, the weight of scrap steel added into the converter is 34 tons, the weight of the molten iron added into the converter is 255 tons, the tapping temperature of the converter is 1655 ℃, the carbon content of the tapped steel is 0.05 percent, deoxidation alloying treatment is carried out in the tapping process, and the slag stopping and tapping operation is carried out by adopting a sliding plate before and after tapping to avoid slag discharging. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1551 ℃, the LF refining slagging, deoxidizing and desulfurizing, and adjusting the component temperature, wherein the chemical components for RH refining are shown in Table 1, and the LF leaving-station temperature is 1613 ℃. Then, the molten steel refined outside the LF furnace is hoisted to an RH vacuum refining furnace, the RH refining in-place temperature is 1593 ℃, 50kg of cerium-iron alloy (the content of cerium-iron alloy Ce is 20%) is added 5min before the vacuum treatment, the chemical components for RH refining and leaving the station are shown in the table 2, and the RH leaving temperature is 1560 ℃. The casting superheat degree of the casting machine is 29 ℃. And then performing slab slow cooling and continuous casting billet quality inspection. The heating temperature of the plate blank is 1240 ℃, the heating time is 215min, the tapping temperature is 1214 ℃, and the heated plate blank is dephosphorized by high-pressure water. The width is fixed by a fixed width press, 2 frames are adopted for rough rolling (the rough rolling adopts a 3+5 mode), the thickness of an intermediate billet is 39mm, and 7 frames are used for CVC finish rolling. The initial rolling temperature of the finish rolling is 1065 ℃, and the finish rolling temperature of the finish rolling is 880 ℃. The laminar cooling adopts a continuous cooling mode 12 (the upper and lower cooling nozzles are separated by two and are one), and the coiling temperature is 635 ℃. And finally, performing quality inspection to obtain the rare earth steel 650CL wheel steel in a qualified mode.
Example two
Carrying out desulfurization pretreatment on molten iron, wherein the S content of the desulfurized KR molten iron leaving the station is 0.001%, and the temperature T of the molten iron is 1334 ℃; the molten iron is decarburized and dephosphorized by adopting a top-bottom combined blown converter to obtain molten steel, argon is blown in the whole smelting process of the converter, the weight of scrap steel added into the converter is 30 tons, the weight of the molten iron added into the converter is 260 tons, the tapping temperature of the converter is 1649 ℃, the carbon content of the tapped steel is 0.04 percent, deoxidation alloying treatment is carried out in the tapping process, and the slag stopping and tapping operation is carried out by adopting a sliding plate before and after tapping to avoid slag discharging. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1551 ℃, the LF refining slagging, deoxidizing and desulfurizing, and adjusting the component temperature, wherein the chemical components for RH refining are shown in Table 1, and the LF leaving-station temperature is 1616 ℃. Then, the molten steel refined outside the LF furnace is hoisted to an RH vacuum refining furnace, the RH refining in-place temperature is 1600 ℃, 100kg of cerium-iron alloy (the content of Ce in the cerium-iron alloy is 20%) is added 8min before the vacuum treatment, the chemical components for RH refining and leaving the station are shown in the table 2, and the RH leaving temperature is 1572 ℃. The casting superheat degree of the casting machine is 34 ℃. And then performing slab slow cooling and continuous casting billet quality inspection. The heating temperature of the plate blank is 1223 ℃, the heating time is 190min, the tapping temperature is 1202 ℃, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a fixed width press, 2 frames are adopted for rough rolling (the rough rolling adopts a 3+5 mode), the thickness of an intermediate billet is 44mm, and 7 frames are used for CVC finish rolling. The initial rolling temperature of finish rolling is 1044 ℃, and the final rolling temperature of finish rolling is 871 ℃. The laminar cooling adopts a continuous cooling mode 12 (the upper and lower cooling nozzles are separated by two and are one), and the coiling temperature is 624 ℃. And finally, performing quality inspection to obtain the rare earth steel 650CL wheel steel in a qualified mode.
EXAMPLE III
Carrying out desulfurization pretreatment on molten iron, wherein the S content of the desulfurized KR molten iron leaving the station is 0.001%, and the temperature T of the molten iron is 1319 ℃; the molten iron is decarburized and dephosphorized by adopting a top-bottom combined blowing converter to obtain molten steel, argon is blown in the whole smelting process of the converter, the weight of scrap steel added into the converter is 31 tons, the weight of the molten iron added into the converter is 261 tons, the tapping temperature of the converter is 1653 ℃, the tapping carbon content is 0.045%, deoxidation alloying treatment is carried out in the tapping process, and sliding plate slag stopping and tapping operations are adopted before and after tapping to avoid slag discharging. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1562 ℃, the LF refining slagging, deoxidizing and desulfurizing are carried out, the component temperature is adjusted, the chemical components for RH refining are shown in table 1, and the LF leaving temperature is 1611 ℃. Then, the molten steel refined outside the LF furnace is hoisted to an RH vacuum refining furnace, the RH refining in-place temperature is 1597 ℃, 150kg of cerium-iron alloy (the content of cerium-iron alloy Ce is 20%) is added 6min before the vacuum treatment, the chemical components for RH refining and leaving the station are shown in the table 2, and the RH leaving temperature is 1564 ℃. The casting superheat degree of the casting machine is 28 ℃. And then performing slab slow cooling and continuous casting billet quality inspection. Heating the plate blank at 1193 ℃, heating for 200min, tapping at 1175 ℃, and removing phosphorus from the heated plate blank by high-pressure water. The width is fixed by a fixed width press, 2 frames are adopted for rough rolling (the rough rolling adopts a 3+5 mode), the thickness of an intermediate billet is 49mm, and 7 frames are used for CVC finish rolling. The initial rolling temperature of the finish rolling is 1021 ℃, and the final rolling temperature of the finish rolling is 854 ℃. The laminar cooling adopts a continuous cooling mode 12 (the upper and lower cooling nozzles are separated by two and are one), and the coiling temperature is 607 ℃. And finally, performing quality inspection to obtain the rare earth steel 650CL wheel steel in a qualified mode.
TABLE 1 chemical composition (wt%) of LF refining for RH refining 1-3 in inventive example
TABLE 2 chemical composition (wt%) of RH refining casting machine 1-3 of the examples of the present invention
| Examples | C | Si | Mn | P | S | Alt | Als | Nb | Ti | Ca | Ce |
| 1 | 0.07 | 0.10 | 1.69 | 0.011 | 0.001 | 0.042 | 0.038 | 0.057 | 0.051 | 0.0015 | 0.0016 |
| 2 | 0.07 | 0.10 | 1.66 | 0.017 | 0.002 | 0.041 | 0.039 | 0.058 | 0.049 | 0.0016 | 0.0031 |
| 3 | 0.07 | 0.11 | 1.70 | 0.012 | 0.001 | 0.038 | 0.036 | 0.056 | 0.053 | 0.0014 | 0.0045 |
The mechanical properties of the steel sheets of examples 1 to 3 of the present invention were examined, and the results are shown in Table 3.
TABLE 3 mechanical Properties of Steel sheets of inventive examples 1 to 3
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. The rare earth microalloyed 650CL steel for the wheel is characterized in that: the chemical components and the mass percentage thereof are as follows: 0.06-0.08% of C, 0.05-0.15% of Si, 1.40-1.80% of Mn, less than 0.025% of P, less than 0.015% of S, 0.035-0.070% of Nb, 0.035-0.070% of Ti, 0.020-0.055% of Alt, 0.0010-0.0040% of Ca, 0.0010-0.0050% of Ce, and the balance of iron element and inevitable impurities.
2. The rare earth microalloyed 650CL steel for wheel according to claim 1, characterized in that: the chemical components and the mass percentage thereof are as follows: 0.06-0.08% of C, 0.05-0.15% of Si, 1.45-1.60% of Mn, less than 0.018% of P, less than 0.005% of S, 0.055-0.065% of Nb, 0.045-0.055% of Ti, 0.020-0.050% of Alt, 0.0010-0.0040% of Ca, 0.0010-0.0050% of Ce, and the balance of iron element and inevitable impurities.
3. The rare earth microalloyed 650CL steel for wheel according to claim 1, characterized in that: the chemical components and the mass percentage thereof are as follows: 0.07% of C, 0.10% of Si, 1.69% of Mn, 0.011% of P, 0.001% of S, 0.057% of Nb, 0.051% of Ti, 0.042% of Alt, 0.0015% of Ca, 0.0016% of Ce, and the balance of iron and inevitable impurities.
4. The rare earth microalloyed 650CL steel for wheel according to claim 1, characterized in that: the chemical components and the mass percentage thereof are as follows: 0.07% of C, 0.10% of Si, 1.66% of Mn, 0.017% of P, 0.002% of S, 0.058% of Nb, 0.049% of Ti, 0.041% of Alt, 0.0016% of Ca, 0.0031% of Ce, and the balance of iron and inevitable impurities.
5. The rare earth microalloyed 650CL steel for wheel according to claim 1, characterized in that: the chemical components and the mass percentage thereof are as follows: 0.07% of C, 0.11% of Si, 1.70% of Mn, 0.012% of P, 0.001% of S, 0.056% of Nb, 0.053% of Ti, 0.038% of Alt, 0.0014% of Ca, 0.0045% of Ce, and the balance of iron and inevitable impurities.
6. The method for producing a steel for a rare earth microalloyed 650CL wheel according to any one of claims 1 to 5, characterized in that: the method comprises the following steps: converter smelting, refining process, casting process, continuous casting billet heating, rolling, controlled cooling and coiling;
in order to improve the stable control of the yield of the Ce rare earth, a Ce-Fe alloy is required to be added in the process of smelting the billet, wherein the mass percent of Ce accounts for 10-30% of that of the added Ce-Fe alloy, the oxygen content in the added Ce-Fe alloy is less than or equal to 20ppm, and the Ce-Fe alloy adding station is positioned 3-8min before the RH vacuum treatment is finished;
in order to ensure the control of the lower sulfur content of the molten iron, the KR desulfurization treatment adopts deep desulfurization operation, the sulfur content of the molten iron is less than or equal to 0.001 percent when the desulfurization is finished, and the slag removing proportion on the surface of the molten iron tank is more than or equal to 95 percent;
in order to improve the cleanliness of molten steel and the yield of rare earth, the carbon content of components at the smelting end point of the converter needs to be controlled to be 0.04-0.06 percent, the target components need to be hit at the end point of the converter at one time, the end point of the converter is prevented from being controlled by adopting point blowing operation, the tapping temperature of the converter is controlled to be 1620-1660 ℃, the tapping of the converter is started and ended by adopting sliding plate slag stopping operation, and the converter slag is prevented from being put into a steel ladle;
in order to reduce the nitrogen increasing amount of molten steel and control the cleanliness of the molten steel in the LF refining process, the rotating speed of a dust removal fan needs to be adjusted in the LF heating process, the pressure in a smoke hood is ensured to be at micro positive pressure in the LF refining heating process, and external air is prevented from entering the smoke hood and contacting the molten steel; LF dislocation ensures that the S content in the molten steel is less than or equal to 0.005 percent; after LF refining treatment is finished, calcium treatment is carried out, a high-calcium wire is fed for 200-300 m in the calcium treatment process, the wire feeding speed is controlled to be 3-3.5 m/s in the calcium treatment process, and molten steel is blown for 5-8 min after the calcium treatment is finished;
in order to ensure the high cleanliness uniformity of molten steel and the stable control of the yield of high rare earth content, the setting range of the annular flow in the RH vacuum treatment process is 120m 3/min-150 m 3/min; the RH vacuum degree needs to be ensured to be less than 1.3mbar, and the deep vacuum treatment time is 20-25 min; adding cerium-iron alloy at the later stage of RH vacuum treatment, adding rare earth, circulating molten steel for 5min for repressing, and soft-blowing for 6-8 min after the vacuum treatment is finished;
argon is adopted for protection in the whole process of the tundish in the casting process of the casting machine, the slag discharge detection equipment is started in the ladle casting process, and the ladle slag is prevented from flowing into the tundish after the ladle casting is finished; the casting process of the casting machine is controlled by adopting a constant casting speed, the casting speed setting range is 1.1-1.6 m/min according to different casting sections, and the superheat degree of tundish casting is controlled at 20-35 ℃;
the slab is cooled for 36 hours and then released after passing the low-power inspection, the slab is put into a hot rolling heating furnace, the furnace time is 180-;
the rolling comprises rough rolling and finish rolling, wherein the rough rolling adopts a 2-stand rolling mill for rough rolling, and the finish rolling adopts a 7-stand continuous variable-crown rolling mill for finish rolling; the initial rolling temperature of the finish rolling is more than or equal to 950 ℃, and the final rolling temperature of the finish rolling is 850-910 ℃;
laminar flow continuous cooling equipment is adopted for cooling, a cooling code is set to be in a 12-mode, the upper-section cooling nozzle is separated by one, the lower-end cooling nozzle is separated by two, and the coiling temperature is 600-.
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| CN114807505B (en) * | 2022-04-15 | 2023-08-18 | 山西太钢不锈钢股份有限公司 | Method for adding rare earth elements into wheel steel |
| CN115652209A (en) * | 2022-11-07 | 2023-01-31 | 鞍钢股份有限公司 | 650MPa grade sulfuric acid dew point corrosion resistant rare earth steel and manufacturing method thereof |
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