CN113604739A - Steel for car driving shaft ball cage for precision forming and manufacturing method thereof - Google Patents
Steel for car driving shaft ball cage for precision forming and manufacturing 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
- 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
- C22C38/04—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
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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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
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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
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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
- C21D2211/009—Pearlite
Abstract
The invention discloses steel for a car driving shaft ball cage for precision forming, which comprises the following components in percentage by mass: c: 0.54-0.57%, Si: 0.17 to 0.37%, Mn: 0.62-0.68%, P is less than or equal to 0.020%, S is less than or equal to 0.015%, Cr: 0.10-0.30%, Ni is less than or equal to 0.25%, Cu is less than or equal to 0.2%, Al: 0.020-0.035%, N: 60-120 ppm, 2-5% of Al/N, 2.0ppm or less of H, 15ppm or less of O, and the balance of Fe and inevitable impurities; the microstructure of the steel for the ball cage of the car driving shaft for precise forming consists of ferrite and pearlite and has uniform tissue distribution; by controlling the Al and N content and Al/N in the steel bar for the car driving shaft ball cage for precision forming, the austenite grain size is fine and uniform and is 7.0-8.0 grade; the invention reduces the activity of C by adding Cr element, reduces the decarburization in the heating and rolling process, ensures that the decarburization of the round steel is not higher than 0.8 percent, and obviously improves the mechanical property of the round steel because the Cr element is a strong carbide forming element.
Description
Technical Field
The invention relates to the technical field of structural steel, in particular to steel for a car driving shaft ball cage for precision forming and a manufacturing method thereof.
Background
China is a big country for manufacturing the whole automobile and automobile parts, but has a large gap with the strong countries for manufacturing the automobiles in Germany, America, Japan and the like in the aspects of technology, quality and the like. The ball cage is an important part in a vehicle transmission system, and has the function of transmitting vehicle power from a transmission to a driving wheel to drive a car to run at a high speed. At present, the steel for the automobile ball cage produced in China mainly uses common 55 steel, and still stays on the level only meeting the national standard requirements, the material hardenability is low, the static torsion strength is low, and the requirement of upgrading and updating automobiles cannot be met.
C in GB/T699: 0.52-0.60%, Si: 0.17-0.37%, Mn: 0.50-0.80%, Cr: less than or equal to 0.25 percent, Cu: less than or equal to 0.20 percent, Ni: less than or equal to 0.30 percent, P: less than or equal to 0.035%, S: less than or equal to 0.035%, N less than or equal to 0.0080%, insufficient mechanical property and poor hardenability. Comparison of patent CN109852872A C: 0.53-0.57%, Si: 0.22-0.32%, Mn: 0.80-0.95%, Cr: 0.20-0.30%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, O is less than or equal to 0.0015%, H is less than or equal to 0.00015%, and the balance is Fe, so that the hardenability of the material is obviously improved, but the toughness is insufficient, and the risk of heat treatment embrittlement exists.
Disclosure of Invention
The invention aims to provide steel for a car driving shaft ball cage for precision forming and a manufacturing method thereof aiming at the defects in the prior art.
The technical scheme for solving the problems comprises the following steps: the steel for the cage of the car driving shaft for precise forming and the manufacturing method thereof comprise the following components by mass percent: c: 0.54-0.57%, Si: 0.17 to 0.37%, Mn: 0.62-0.68%, P is less than or equal to 0.020%, S is less than or equal to 0.015%, Cr: 0.10-0.30%, Ni is less than or equal to 0.25%, Cu is less than or equal to 0.2%, Al: 0.020-0.035%, N: 60-120 ppm, 2-5% of Al/N, 2.0ppm or less of H, 15ppm or less of O, and the balance of Fe and inevitable impurities.
The manufacturing method of the steel for the cage of the car driving shaft for precise forming comprises the following steps: molten iron → converter steelmaking → LF refining → VD vacuum processing → continuous casting → billet pit cooling → heating → dephosphorization → rolling → cooling → segmentation → finishing → flaw detection → packaging and warehousing.
Further, in the converter steelmaking process: ferrosilicon, silicomanganese, low-carbon ferromanganese, medium-carbon ferromanganese, high-carbon ferromanganese, low-carbon ferrochrome, medium-carbon ferrochrome and high-carbon ferrochrome are required to be prepared for the alloy, and the target C content is 0.12-0.20%; the target P is less than or equal to 0.015 percent; the tapping target temperature is more than or equal to 1600 ℃.
Further, the tapping auxiliary materials require that: measured by a 50t converter, 270kg of calcium aluminate per furnace, 330kg of lime per furnace and 0.4-0.8 kg of aluminum ingot or aluminum cake per t.
Further, in the LF refining process: refining molten steel on a ladle refining furnace, removing harmful gas and impurities in the steel, seating the ladle, measuring the temperature, analyzing, and adjusting the argon pressure according to conditions; and in the LF refining stage, the white slag time is required to be more than or equal to 15 minutes, pre-Ca treatment is carried out before ladle lifting, and a pure calcium wire or a calcium silicon wire of 30-50 meters is fed according to the measurement of a 50t converter.
Furthermore, the VD vacuum treatment stage requires that the holding time is more than or equal to 10 minutes under the condition that the vacuum degree is less than or equal to 67 pa; the soft argon blowing time is more than or equal to 20 minutes.
Further, in the continuous casting process: the temperature of a continuous casting liquidus is 1481 ℃; high-temperature molten steel in the ladle passes through the protective sleeve and is poured into a tundish, and the tundish superheat degree is as follows: controlling the degree of superheat of a casting furnace to be 30-45 ℃ and controlling a continuous casting furnace to be 20-35 ℃; molten steel in the tundish is connectedCasting a crystallizer, and adding electromagnetic stirring, wherein the electromagnetic stirring of the crystallizer is 200A/2Hz, and the electromagnetic stirring of the tail end of the crystallizer is 250A/10 Hz; casting 220X 220mm at reasonable casting speed2And adjusting the drawing speed of the qualified continuous casting billet with the section size to 0.9-1.1 m/min according to the superheat degree, blowing argon gas into the tundish before casting, and exhausting, and closing the exhausted argon gas after a covering agent is added.
Further, the heating process adopts a heating furnace heating process: the preheating section is less than or equal to 800 ℃, the heating section I is 880-1100 ℃, the heating section II is 1080-1220 ℃, the soaking section is 1060-1220 ℃, and the heating time is more than or equal to 180 min.
Further, after the steel billet is discharged from the furnace, removing phosphorus and oxide skin by high-pressure water, wherein the final rolling temperature is more than or equal to 850 ℃.
The invention has the following beneficial effects:
the invention provides steel for a car driving shaft ball cage for precise forming and a manufacturing method thereof, and the obtained steel for the car driving shaft ball cage for precise forming has a microstructure consisting of ferrite and pearlite and has uniform tissue distribution; by controlling the Al and N content and Al/N in the steel bar for the car driving shaft ball cage for precision forming, the austenite grain size is fine and uniform and is 7.0-8.0 grade; the invention reduces the activity of C by adding Cr element, reduces the decarburization in the heating and rolling process, ensures that the decarburization of the round steel is not higher than 0.8 percent, and obviously improves the mechanical property of the round steel because the Cr element is a strong carbide forming element, so that the tensile strength of the round steel reaches more than 750MPa, the yield strength reaches more than 430MPa, the elongation reaches more than 20 percent, and the reduction of area reaches more than 40 percent.
Drawings
FIG. 1 is a photograph showing austenite grain sizes of a finished steel bar for a cage of a drive shaft of a passenger car for precision forming, which is provided in example 7 of the present invention, from an outer surface 1/2;
fig. 2 is a metallographic picture of a steel bar 1/2 for a cage of a precision forming car drive shaft according to embodiment 7 of the present invention;
fig. 3 is a metallographic picture of a steel bar 1/4 for a cage of a precision forming car drive shaft according to embodiment 7 of the present invention.
Detailed Description
The steel for the cage of the car driving shaft for precision forming has a uniform ferrite and pearlite structure, the austenite grain size is 7.0-8.0 grade, and the tensile strength is more than or equal to 750MPa, the yield strength is more than or equal to 430MPa, the elongation is more than or equal to 20 percent, and the reduction of area is more than or equal to 40 percent after heat preservation at 820 +/-30 ℃ for 45min for air cooling.
The steel for the car driving shaft ball cage comprises the following components in percentage by mass: c: 0.54-0.57%, Si: 0.17 to 0.37%, Mn: 0.62-0.68%, P is less than or equal to 0.020%, S is less than or equal to 0.015%, Cr: 0.10-0.30%, Ni is less than or equal to 0.25%, Cu is less than or equal to 0.2%, Al: 0.020-0.035%, N: 60-120 ppm, 2-5% of Al/N, 2.0ppm or less of H, 15ppm or less of O, and the balance of Fe and inevitable impurities.
C and Mn are main elements for improving the strength of the steel for the ball cage of the driving shaft of the car for precision forming, but the carbon content is high, so that the plasticity is not favorable, particularly when the Mn content is high, the carbon content is more than 0.57 percent, so that the processability is not favorable, and the strengthening effect is not favorable when the C content is less than 0.54 percent. Mn has the capability of forming and stabilizing an austenite structure of steel and simultaneously reduces the critical transformation temperature to play a role of refining pearlite, but if the content is too high, the time required for homogenization is difficult to achieve, and in addition, the too high Mn can also promote grain growth, so the Mn content is difficult to be too high, and by combining the characteristics, the steel controls 0.54-0.57% of C and 0.62-0.68% of Mn.
Si can improve the strength, hardness, elasticity and wear resistance of steel, and Si can improve the AC3 temperature of steel and has great benefit on the tempering stability of steel, but Si has poor thermal conductivity, is easy to have cracking risk and has serious decarburization tendency. Therefore, the silicon is controlled to 0.17-0.37%.
Cr is one of the main alloy elements added into the steel, the addition of Cr can obviously improve the hardenability, the strength, the wear resistance and other properties of the steel, but Cr is also an element which is easy to generate banded segregation, and the excessively high Cr can obviously reduce the toughness of quenched and tempered steel. Therefore, the Cr content in the present invention is 0.10 to 0.30%.
The invention controls the content of Al and N in the gear steel, the refined grains must have AlN particles with certain volume fraction in the steel, and the grain boundary can be pinned at high temperature to inhibit the growth of austenite grains. However, if Al is excessive or the Al/N ratio is not well matched, inclusions are easily formed in the steel to affect the quality of the steel. Excessive Al forms Al2O3 inclusions which are difficult to remove, and Al2O3, CaS and the like are easy to absorb on a tundish nozzle to form 'nodulation', so that the castability of molten steel is poor. Further, the AlN particles have an increased radius, and needle-like inclusions are formed. The other element N for forming AlN is added in an alloy mode, but excessive N causes high gas content and is easy to form subcutaneous bubbles, and the quality of steel is influenced, so that the alloy has proper Al and N contents: al: 0.020-0.035%, N: 0.0060-0.0120%, Al and N in AlN are combined to form AlN particles, the crystal boundary is pinned, the mass ratio of Al to N required for forming one AlN particle is 27/14, and Al/N is more than or equal to 2 and less than or equal to 5.
The steel for the car driving shaft ball cage for precise forming adopts a two-step process flow: the first step is as follows: molten iron → converter steelmaking → LF refining → VD vacuum treatment → continuous casting → steel billet pit cooling; the second step is that: heating → dephosphorization → rolling → cooling → segmentation → finishing → inspection → packaging and warehousing.
The first step is as follows: molten iron → converter steelmaking → LF refining → VD vacuum processing → continuous casting → steel billet pit cooling, which specifically comprises the following steps:
carrying out primary smelting of molten steel in a 50-ton converter; refining with a steel ladle with corresponding tonnage; continuous casting and pouring; producing 220X 220mm2Qualified continuous casting billet of section size:
according to the production method of the steel for the car driving shaft ball cage for precise forming, the steel tapping auxiliary material in the converter steelmaking stage is required to be as follows: measured by a 50t converter, 270kg of calcium aluminate per furnace, 330kg of lime per furnace and 0.4-0.8 kg of aluminum ingot or aluminum cake per t.
1. In the converter steelmaking process: ferrosilicon, silicomanganese, low-carbon ferromanganese, medium-carbon ferromanganese, high-carbon ferromanganese, low-carbon ferrochrome, medium-carbon ferrochrome and high-carbon ferrochrome are required to be prepared for the alloy, and the target C content is 0.12-0.20%; the target P is less than or equal to 0.015 percent; the tapping target temperature is more than or equal to 1600 ℃. And (5) tapping auxiliary material requirements: measured by a 50t converter, 270kg of calcium aluminate per furnace, 330kg of lime per furnace and 0.4-0.8 kg of aluminum ingot or aluminum cake per t.
2. In the LF refining process: refining molten steel on a ladle refining furnace (the capacity of which is matched with that of a converter), removing harmful gas and impurities in the steel, seating the ladle, measuring the temperature, analyzing, and adjusting the argon pressure according to the condition; and in the LF refining stage, the white slag time is required to be more than or equal to 15 minutes, pre-Ca treatment is carried out before ladle lifting, and a pure calcium wire or a calcium silicon wire of 30-50 meters is fed according to the measurement of a 50t converter. The VD vacuum treatment stage requires that the holding time is more than or equal to 10 minutes under the condition that the vacuum degree is less than or equal to 67 pa; the soft argon blowing time is more than or equal to 20 minutes.
3. In the continuous casting process: the temperature of a continuous casting liquidus is 1481 ℃; high-temperature molten steel in the ladle passes through the protective sleeve and is poured into a tundish, and the tundish superheat degree is as follows: controlling the degree of superheat of a casting furnace to be 30-45 ℃ and controlling a continuous casting furnace to be 20-35 ℃; the molten steel in the tundish passes through a continuous casting crystallizer and is added with electromagnetic stirring, the electromagnetic stirring of the crystallizer is 200A/2Hz, and the electromagnetic stirring of the tail end is 250A/10 Hz; casting 220X 220mm at reasonable casting speed2Adjusting the drawing speed of the qualified continuous casting billet with the section size to 0.9-1.1 m/min according to the superheat degree, blowing argon into the tundish before casting, and emptying the argon after a covering agent is added; the pulling rate is adjusted within 0.05m/min per minute, and the continuous casting furnace keeps constant pulling rate casting except special conditions; and (4) feeding the qualified continuous casting billets into a slow cooling pit for slow cooling for more than or equal to 36 hours.
The second step is that: heating → dephosphorization → rolling → cooling → segmentation → finishing → flaw detection → packaging and warehousing, which is specifically as follows:
the hot processing rolling method of the rolling mill is adopted, the surface of the qualified continuous casting billet is cleaned firstly, and then the continuous casting billet is hot processed and rolled to a finished product steel bar, and the technological key points are as follows:
1. the heating process adopts a heating furnace heating process: the preheating section is less than or equal to 800 ℃, the first section is heated to 880-1100 ℃, the second section is heated to 1080-1220 ℃, the soaking section is heated to 1060-1220 ℃, and the heating time is more than or equal to 180 min; compared with the prior art, the soaking temperature of the technical scheme is increased by 20 ℃ so as to implement the diffusion process of heating the billet, thereby being beneficial to improving the component uniformity and the structure uniformity of the continuous casting billet. Research shows that AlN has the fastest solid solution speed at the temperature, so that AlN particles which are not dissolved originally in the steel are dissolved more by high rolling heating temperature, Al and N concentration in a matrix is increased, and more dispersed particles are separated out when the steel is cooled later. In addition, the finishing rolling temperature can be increased only by increasing the heating temperature, so that austenite can recover and recrystallize more fully after rolling, and AlN is distributed more uniformly.
2. The rolling process adopts a controlled rolling process: and (3) after the steel billet is discharged from the furnace, removing phosphorus and oxide skin by using high-pressure water, wherein the final rolling temperature is more than or equal to 850 ℃. Under this process, the N is advantageously desolventized from the gamma solid solution and combined with Al in the steel into AlN. The final rolling temperature is more than 850 ℃ because the solubility of nitrogen in alpha-Fe is less than that in gamma-Fe, and two peaks of AlN precipitation amount caused by the excitation of phase transformation, if the final rolling temperature is low, AlN distribution is not uniform due to the peak precipitation of AlN, and recovery recrystallization is insufficient to cause structural anisotropy.
The steel for the car driving shaft ball cage for precision forming, which is prepared by the component scheme and the smelting and rolling methods, meets the following performance requirements:
tensile strength: 750-780 MPa, yield strength: 430-450 MPa, elongation: 20-25%, and section shrinkage: 40-50%;
the bar material has a macrostructure: the general porosity is less than or equal to 1.0 level, the central porosity is less than or equal to 1.0 level, and the segregation is less than or equal to 1.0 level;
purity of the bar: grade A is less than or equal to 1.0, grade A is less than or equal to 0.5, grade B is less than or equal to 1.0, grade C is less than or equal to 0.5, grade D is less than or equal to 1.0, and grade Ds is less than or equal to 1.0;
the austenite grain size is 7.0-8.0 grade;
the decarburized layer is less than or equal to 0.8 percent of D.
Example 1
The steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.57%, Si: 0.18%, Mn: 0.65%, P: 0.012%, S: 0.0015%, Cr: 0.15%, Ni: 0.011%, Cu: 0.012%, Al: 0.02169%, N: 0.0068%, Al/N: 3.2, H: 0.00012%, O: 0.0011%, and the balance of Fe and inevitable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 660-. The rolling process comprises the following steps: beginning rolling at 1036-.
Example 2:
the steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.54%, Si: 0.20%, Mn: 0.65%, P: 0.014%, S: 0.0020%, Cr: 0.16%, Ni: 0.015%, Cu: 0.010%, Al: 0.02315%, N: 0.0062%, Al/N: 3.7, H: 0.00015%, O: 0.0010%, the balance being Fe and unavoidable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 642-674 ℃, the heating section I955-989 ℃, the heating section II 1133-1166 ℃, the soaking section 1152-1165 ℃, the heating section I, the heating section II and the soaking section are high-temperature sections, the heating time of the high-temperature section is 145-146min, and the total heating time is 287-292 min. The rolling process comprises the following steps: at the beginning of milling 1036-.
Example 3
The steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.54%, Si: 0.20%, Mn: 0.65%, P: 0.015%, S: 0.0012%, Cr: 0.15%, Ni: 0.012%, Cu: 0.011%, Al: 0.02671%, N: 0.0063%, Al/N: 4.2, H: 0.00011%, O: 0.0011%, and the balance of Fe and inevitable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 634-. The rolling process comprises the following steps: rolling 1032 ℃ and 1042 ℃ at the beginning, finish rolling 958 ℃ and 976 ℃, finish rolling 926 ℃ and 929 ℃, and feeding 855 ℃ on a cooling bed.
Example 4:
the steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.54%, Si: 0.19%, Mn: 0.65%, P: 0.016%, S: 0.0011%, Cr: 0.15%, Ni: 0.012%, Cu: 0.010%, Al: 0.02688%, N: 0.0060%, Al/N: 4.5, H: 0.00015%, O: 0.0008 percent, and the balance of Fe and inevitable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 701-. The rolling process comprises the following steps: beginning rolling 1044 and 1050 ℃, finish rolling 970 and 980 ℃, finishing rolling 928 and 936 ℃ and feeding on a cooling bed 857 and 863 ℃.
Example 5:
the steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.55%, Si: 0.21%, Mn: 0.64%, P: 0.014%, S: 0.0013%, Cr: 0.15%, Ni: 0.010%, Cu: 0.011%, Al: 0.02606%, N: 0.0072%, Al/N: 3.6, H: 0.00011%, O: 0.0011%, and the balance of Fe and inevitable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 685-. The rolling process comprises the following steps: beginning to roll 1041-.
Example 6:
the steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.56%, Si: 0.21%, Mn: 0.65%, P: 0.010%, S: 0.0013%, Cr: 0.14%, Ni: 0.014%, Cu: 0.011%, Al: 0.02043%, N: 0.0071%, Al/N: 2.8, H: 0.00011%, O: 0.0010%, the balance being Fe and unavoidable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 632-. The rolling process comprises the following steps: rolling at 1042-.
Example 7:
the steel for the car driving shaft ball cage for precise forming comprises the following components in percentage by mass: c: 0.56%, Si: 0.20%, Mn: 0.64%, P: 0.012%, S: 0.0016%, Cr: 0.15%, Ni: 0.014%, Cu: 0.011%, Al: 0.02169%, N: 0.0064%, Al/N: 3.4, H: 0.00012%, O: 0.0011%, and the balance of Fe and inevitable impurities.
In the second step of heating, the heating process of the heating furnace comprises the following steps: the preheating section 656-. The rolling process comprises the following steps: rolling 1042-.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (9)
1. The utility model provides a steel for car drive shaft ball cage for precision forming which characterized in that: comprises the following components in percentage by mass: c: 0.54-0.57%, Si: 0.17 to 0.37%, Mn: 0.62-0.68%, P is less than or equal to 0.020%, S is less than or equal to 0.015%, Cr: 0.10-0.30%, Ni is less than or equal to 0.25%, Cu is less than or equal to 0.2%, Al: 0.020-0.035%, N: 60-120 ppm, 2-5% of Al/N, 2.0ppm or less of H, 15ppm or less of O, and the balance of Fe and inevitable impurities.
2. A manufacturing method of steel for a car driving shaft ball cage for precision forming is characterized by comprising the following steps: the method comprises the following steps: molten iron → converter steelmaking → LF refining → VD vacuum processing → continuous casting → billet pit cooling → heating → dephosphorization → rolling → cooling → segmentation → finishing → flaw detection → packaging and warehousing.
3. The method for manufacturing the steel for the cage of the driving shaft of the sedan for precision forming as claimed in claim 2, wherein the method comprises the steps of: in the converter steelmaking process: ferrosilicon, silicomanganese, low-carbon ferromanganese, medium-carbon ferromanganese, high-carbon ferromanganese, low-carbon ferrochrome, medium-carbon ferrochrome and high-carbon ferrochrome are required to be prepared for the alloy, and the target C content is 0.12-0.20%; the target P is less than or equal to 0.015 percent; the tapping target temperature is more than or equal to 1600 ℃.
4. The method for manufacturing the steel for the cage of the driving shaft of the sedan for precision forming as claimed in claim 3, wherein the method comprises the steps of: and (5) tapping auxiliary material requirements: measured by a 50t converter, 270kg of calcium aluminate per furnace, 330kg of lime per furnace and 0.4-0.8 kg of aluminum ingot or aluminum cake per t.
5. The method for manufacturing the steel for the cage of the driving shaft of the sedan for precision forming as claimed in claim 2, wherein the method comprises the steps of: in the LF refining process: on a ladle refining furnace, the capacity of the refining furnace is matched with that of a converter, molten steel is refined, harmful gas and impurities in the steel are removed, the ladle is seated, temperature is measured, analysis is carried out, and argon pressure is adjusted according to conditions; and in the LF refining stage, the white slag time is required to be more than or equal to 15 minutes, pre-Ca treatment is carried out before ladle lifting, and a pure calcium wire or a calcium silicon wire of 30-50 meters is fed according to the measurement of a 50t converter.
6. The method for manufacturing the steel for the cage of the driving shaft of the sedan for precision forming according to claim 5, wherein the method comprises the following steps: the VD vacuum treatment stage requires that the holding time is more than or equal to 10 minutes under the condition that the vacuum degree is less than or equal to 67 pa; the soft argon blowing time is more than or equal to 20 minutes.
7. The method for manufacturing the steel for the cage of the driving shaft of the sedan for precision forming as claimed in claim 2, wherein the method comprises the steps of: in the continuous casting process: the temperature of a continuous casting liquidus is 1481 ℃; high-temperature molten steel in the ladle passes through the protective sleeve and is poured into a tundish, and the tundish superheat degree is as follows: controlling the degree of superheat of a casting furnace to be 30-45 ℃ and controlling a continuous casting furnace to be 20-35 ℃; the molten steel in the tundish passes through a continuous casting crystallizer,electromagnetic stirring is carried out, the crystallizer is electromagnetically stirred for 200A/2Hz, and the tail end is electromagnetically stirred for 250A/10 Hz; poured to a thickness of 220X 220mm2And adjusting the drawing speed of the qualified continuous casting billet with the section size to 0.9-1.1 m/min according to the superheat degree, blowing argon gas into the tundish before casting, and exhausting, and closing the exhausted argon gas after a covering agent is added.
8. The method for manufacturing the steel for the cage of the driving shaft of the sedan for precision forming as claimed in claim 2, wherein the method comprises the steps of: the heating process adopts a heating furnace heating process: the preheating section is less than or equal to 800 ℃, the heating section I is 880-1100 ℃, the heating section II is 1080-1220 ℃, the soaking section is 1060-1220 ℃, and the heating time is more than or equal to 180 min.
9. The method for manufacturing the steel for the cage of the drive shaft of the sedan for precision forming as claimed in claim 2 or 8, wherein: and (3) after the steel billet is discharged from the furnace, removing phosphorus and oxide skin by using high-pressure water, wherein the final rolling temperature is more than or equal to 850 ℃.
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| CN115491603A (en) * | 2022-09-26 | 2022-12-20 | 宝武杰富意特殊钢有限公司 | Round steel for transmission shaft spherical star shell and preparation method thereof |
| CN115491603B (en) * | 2022-09-26 | 2024-04-26 | 宝武杰富意特殊钢有限公司 | Round steel for transmission shaft spherical star shell and preparation method thereof |
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| CN115491603A (en) * | 2022-09-26 | 2022-12-20 | 宝武杰富意特殊钢有限公司 | Round steel for transmission shaft spherical star shell and preparation method thereof |
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