CN114875226A - Production method of steel for automobile flywheel gear ring - Google Patents
Production method of steel for automobile flywheel gear ring Download PDFInfo
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- CN114875226A CN114875226A CN202210598447.8A CN202210598447A CN114875226A CN 114875226 A CN114875226 A CN 114875226A CN 202210598447 A CN202210598447 A CN 202210598447A CN 114875226 A CN114875226 A CN 114875226A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 238000010583 slow cooling Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000010079 rubber tapping Methods 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- 239000010425 asbestos Substances 0.000 claims abstract description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 10
- 229910001562 pearlite Inorganic materials 0.000 abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 239000011159 matrix material Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The production method of the steel for the automobile flywheel gear ring comprises the following process steps: (1) smelting: controlling the alkalinity of LF to be 6.0-8.0, vacuumizing to be below 67Pa by VD, soft-blowing for 20min after the vacuum-maintaining time is 15min, and casting on a bench, wherein the outlet temperature is controlled to be 45-50 ℃ above the liquidus temperature; (2) continuous casting: the specific water amount is 0.98L/kg, the target value of the superheat degree of a tundish is 30-35 ℃, the temperature of a straightening and withdrawal machine at the center point of the inner arc surface of a casting blank is monitored to be 1100-1150 ℃, and (3) rolling: rolling is controlled, the heating time of a casting blank is 80-100 min, the temperature of a high-temperature section is controlled to be 1120-1170 ℃, the time is 60-80 min, and the tapping temperature is controlled to be 1010-1070 ℃; (4) and (3) controlling cooling: directly cooling and slowly cooling the rolled steel sheet in water, controlling the curling temperature to be 755-785 ℃, and controlling the cooling rate to be 3-5 ℃/s; (5) slow cooling: after the wire rod is coiled, the wire rod enters a slow cooling zone surrounded by asbestos to be slowly cooled from 700-760 ℃ to 500-540 ℃ to obtain a tough structure taking pearlite and ferrite as a matrix, so that the wire rod structure and the mechanical property are uniform.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of steel for an automobile flywheel gear ring.
Background
With the rapid development of the automotive industry, the market demand for automotive steels is increasing. In the production of a wire rod having ferrite plus pearlite as a main structure characteristic, coarse and uneven crystal grains are likely to be formed due to an unreasonable control of a coiling temperature, a cover feeding temperature, a cooling rate and the like, pearlite is low, and the processing and wire rod performance are deteriorated. Therefore, the problems of processing cracking, low processing rate and the like are caused by uneven structure, mechanical property and the like of the wire rod, and great inconvenience is brought to processing and use of downstream customers.
At present, the research on carbon steel in the prior art mainly focuses on the aspects of molten steel castability, purity, tissue homogenization and abnormal tissue control; the castability and purity of molten steel are mainly solved by improving the plasticity of inclusions and reducing the content of inclusions, and the uniformity of the structure is mainly solved by weakening segregation caused in the continuous casting process. At present, the research on the casting process mainly focuses on the aspects of continuous casting under light pressure and low superheat degree casting; the abnormal structure is controlled mainly by controlling the rolling and spinning temperature and controlling the cooling.
Disclosure of Invention
The invention aims to provide a production method of steel for an automobile flywheel gear ring, which can overcome the defects of the prior art, and the produced steel has a tough structure taking pearlite and ferrite as matrixes, so that the wire rod structure and the mechanical property are uniform, and the problems of processing cracking, low processing rate and the like are solved.
The technical scheme of the invention is as follows:
the production method of the steel for the automobile flywheel gear ring comprises the following process steps:
(1) smelting: controlling the alkalinity of LF to be 6.0-8.0, vacuumizing to be below 67Pa by VD, soft-blowing for 20min after the vacuum-maintaining time is 15min, and casting on a bench, wherein the outlet temperature is controlled to be 45-50 ℃ above the liquidus temperature;
(2) continuous casting: the specific water amount is 0.98L/kg, the target value of the superheat degree of a tundish is 30-35 ℃, the temperature of a withdrawal and straightening machine at the center point of the inner arc surface of a casting blank is monitored to be 1100-1150 ℃, and the size of the casting blank is 150mm multiplied by 12 m;
(3) rolling: rolling is controlled, the heating time of a casting blank is 80-100 min, the temperature of a high-temperature section is 1120-1170 ℃, the time is 60-80 min, and the tapping temperature is 1010-1070 ℃;
(4) and (3) controlling cooling: directly cooling and slowly cooling the rolled steel sheet in water, controlling the curling temperature to be 755-785 ℃, and controlling the cooling rate to be 3-5 ℃/s;
(5) slow cooling: and after the coiling, slowly cooling the wire rod in a slow cooling area surrounded by asbestos at the temperature of 700-760 ℃ to 500-540 ℃ to obtain a tissue harmless to processing.
The invention relates to a structure uniformity technology which mainly finely adjusts continuous casting secondary cooling strength and rolling and cooling control from monitoring billet temperature, reduces the continuous casting segregation influence by controlling the billet temperature of different casting blanks at different steel drawing time in the casting process, simultaneously controls the internal structure by adjusting the rolling temperature, and has the structure design that the structure is a toughness structure taking pearlite + ferrite as a matrix, so that the structure harmful to processing can not appear.
The outstanding characteristics and the obvious effects of the invention are mainly reflected in that: (1) under the support of the continuous casting soft reduction technology, the billet temperature control technology is created automatically, and the influence of continuous casting segregation is weakened; (2) a series of new rolling technologies such as stelmor controlled rolling and controlled cooling, slow cooling and the like are adopted, the limit of a high-speed wire controlled cooling process is broken through, the advantages of equipment are fully exerted, the produced steel for the gear ring, which has the pearlite and ferrite as matrixes, has the strength of 700-800 MPa, has the surface shrinkage of more than 20 percent and has no harmful tissues to processing, is used, and the research and development process of high-quality carbon steel is promoted; (3) the existing equipment and process conditions of the steel mills are utilized, so that the investment and the production cost are not increased, and the product quality is improved.
Drawings
FIG. 1 is a gold phase diagram of a wire rod of example 1 of the present invention.
Fig. 2 is a gold phase diagram of a wire rod of example 2 of the present invention.
Fig. 3 is a gold phase diagram of a wire rod of example 3 of the present invention.
Detailed Description
Example 1
The steel is used for flywheel gear ring through the technological process including converter, refining, continuous casting, rolling, etc. The chemical components of the steel are shown in the weight percentage in table 1, and the balance is Fe and inevitable impurities. The key process steps are as follows:
(1) the alkalinity of the final slag of the refining slag of the LF furnace is 6.5; VD soft blowing is carried out for 21min, and the outlet temperature is 1545 ℃;
(2) the continuous casting secondary cooling specific water amount is 0.98L/kg, the superheat degree of a tundish is 35 ℃, the temperature of a withdrawal and straightening machine at the center point of the inner arc surface of a casting blank is monitored to be 1100-1120 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 88min, controlling the temperature of a high-temperature section at 1140 ℃, the time of 70min, and discharging at 1045-1067 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/S, and the coil collecting temperature is 760-775 ℃;
(5) and (4) performing slow cooling after coiling, wherein the inlet slow cooling temperature is 730-750 ℃, and the outlet slow cooling temperature is 515-535 ℃.
Example 2
The steel is used for flywheel gear ring according to the technological process of converter, refining, continuous casting and rolling. The chemical components of the steel are shown in the weight percentage in table 1, and the balance is Fe and inevitable impurities. The key process steps are as follows:
(1) the alkalinity of the final slag of the refining slag of the LF furnace is 7.0; VD soft blowing is carried out for 20min, and the outlet temperature is 1545 ℃;
(2) the secondary cooling specific water amount of continuous casting is 0.98L/kg, the superheat degree of a tundish is 34 ℃, the temperature of a withdrawal and straightening machine at the center point of the inner arc surface of a casting blank is monitored to be 1100-1125 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 95min, controlling the temperature of a high-temperature section at 1130 ℃ for 75min, and discharging at 1011-1037 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/S, and the coiling temperature is 762-778 ℃;
(5) and (4) slowly cooling after coiling, wherein the slow cooling temperature is 735-755 ℃, and the temperature of the discharged slow cooling zone is 520-535 ℃.
Example 3
The steel is used for flywheel gear ring according to the technological process of converter, refining, continuous casting and rolling. The chemical components of the steel are shown in the table 1 in percentage by weight, and the balance is Fe and inevitable impurities. The key process steps are as follows:
(1) the alkalinity of the final slag of the refining slag of the LF furnace is 7.1; VD soft blowing is carried out for 20min, and the outlet temperature is 1545 ℃;
(2) the secondary cooling specific water amount of the continuous casting is 0.98L/kg, the superheat degree of a tundish is 33 ℃, the temperature of a tension leveler entering the center point of the inner arc surface of the casting blank is monitored to be 1110-1130 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 99min, controlling the temperature of a high-temperature section to be 1120 ℃, the time to be 75min, and the tapping temperature to be 1035-1069 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/S, and the coil collection temperature is 765-780 ℃;
(5) and (4) slowly cooling after coiling, wherein the inlet slow cooling temperature is 740-760 ℃, and the outlet slow cooling temperature is 525-540 ℃.
The metallographic structure and the mechanical property of the wire rod of each example are detected in table 2.
Table 1 chemical composition of example steel (%)
TABLE 2 detection results of metallographic structure of wire rod in examples
Claims (1)
1. The production method of the steel for the automobile flywheel gear ring is characterized by comprising the following process steps:
(1) smelting: controlling the alkalinity of LF to be 6.0-8.0, vacuumizing to be below 67Pa by VD, soft-blowing for 20min after the vacuum-maintaining time is 15min, and casting on a bench, wherein the outlet temperature is controlled to be 45-50 ℃ above the liquidus temperature;
(2) continuous casting: the specific water amount is 0.98L/kg, the target value of the superheat degree of a tundish is 30-35 ℃, the temperature of a withdrawal and straightening machine at the center point of the inner arc surface of a casting blank is monitored to be 1100-1150 ℃, and the size of the casting blank is 150mm multiplied by 12 m;
(3) rolling: rolling is controlled, the heating time of a casting blank is 80-100 min, the temperature of a high-temperature section is 1120-1170 ℃, the time is 60-80 min, and the tapping temperature is 1010-1070 ℃;
(4) and (3) controlling cooling: after rolling, directly cooling in water and slowly cooling, wherein the curling temperature is controlled to be 755-785 ℃, and the cooling rate is 3-5 ℃/s;
(5) slow cooling: and after the coiling, slowly cooling the wire rod in a slow cooling area surrounded by asbestos at the temperature of 700-760 ℃ to 500-540 ℃ to obtain a tissue harmless to processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598447.8A CN114875226A (en) | 2022-05-30 | 2022-05-30 | Production method of steel for automobile flywheel gear ring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210598447.8A CN114875226A (en) | 2022-05-30 | 2022-05-30 | Production method of steel for automobile flywheel gear ring |
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| CN114875226A true CN114875226A (en) | 2022-08-09 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106256918A (en) * | 2015-06-17 | 2016-12-28 | 上海梅山钢铁股份有限公司 | The Automobile flywheel cold-strip steel of a kind of precision stamping processing and manufacture method thereof |
| CN109055676A (en) * | 2018-09-20 | 2018-12-21 | 苏州翔楼新材料股份有限公司 | A kind of Automobile flywheel disk cold rolling Fine Steel Casting iron S50C heat treatment process |
| CN110616361A (en) * | 2019-11-06 | 2019-12-27 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for annealing-free nitriding |
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2022
- 2022-05-30 CN CN202210598447.8A patent/CN114875226A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106256918A (en) * | 2015-06-17 | 2016-12-28 | 上海梅山钢铁股份有限公司 | The Automobile flywheel cold-strip steel of a kind of precision stamping processing and manufacture method thereof |
| CN109055676A (en) * | 2018-09-20 | 2018-12-21 | 苏州翔楼新材料股份有限公司 | A kind of Automobile flywheel disk cold rolling Fine Steel Casting iron S50C heat treatment process |
| CN110616361A (en) * | 2019-11-06 | 2019-12-27 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for annealing-free nitriding |
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Application publication date: 20220809 |