CN112281051A - 690 MPa-grade hot-rolled wheel steel with thickness of more than 10mm and manufacturing method thereof - Google Patents

690 MPa-grade hot-rolled wheel steel with thickness of more than 10mm and manufacturing method thereof Download PDF

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CN112281051A
CN112281051A CN202010929396.3A CN202010929396A CN112281051A CN 112281051 A CN112281051 A CN 112281051A CN 202010929396 A CN202010929396 A CN 202010929396A CN 112281051 A CN112281051 A CN 112281051A
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楚斌
宋振官
张振卫
徐剑
王海梁
盛凯英
秦哲
李强刚
刘启森
代玖林
白少金
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Rizhao Steel Holding Group Co Ltd
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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
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • 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
    • 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
    • C22C38/04—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention relates to the technical field of high-strength wheel steel, in particular to 690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm and a manufacturing method thereof. The wheel steel comprises the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.03 to 0.15 percent of Si, 1.3 to 1.5 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, 0.02 to 0.05 percent of Alt, 0.01 to 0.03 percent of Nb0.03, 0.03 to 0.05 percent of Ti, less than or equal to 0.30 percent of Cr, 0.01 to 0.04 percent of Mo0.006 percent of N, and the balance of Fe and inevitable impurities. The manufacturing method of the invention adopts steel rolling temperature control, constant-speed rolling and sectional cooling modes, and can effectively control the casting blank segregation and the level of a banded structure so as to meet the problems of spoke center cracking, poor fatigue property and the like in the wheel forming process.

Description

690 MPa-grade hot-rolled wheel steel with thickness of more than 10mm and manufacturing method thereof
Technical Field
The invention relates to the technical field of high-strength wheel steel, in particular to 690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm and a manufacturing method thereof.
Background
The demand for light weight of commercial vehicles is more obvious, the wheel is one of main measurement indexes, the demand of wheel factories for high-strength wheel steel is increasing day by day, and the 590 Mpa-grade tensile strength is the highest strength grade which is practical in batch in the current wheel industry. However, with the market change and the demand increase, the wheel spoke with the tensile strength of 690MPa is gradually a new research direction.
The traditional high-strength alloy wheel steel has the defects of serious casting blank element segregation, difficult inclusion control, large performance fluctuation and the like, the defects directly influence the problems of welding, spoke center hole cracking, poor fatigue and the like in the wheel steel forming process, and the defects are more obvious along with the improvement of the strength.
Disclosure of Invention
Aiming at the problems of unstable performance, cracking of spoke center holes, welding cracks, poor fatigue property and the like of high-strength alloy wheel steel in the prior art, the invention provides 690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm and a manufacturing method thereof.
A690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm comprises the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.03 to 0.15 percent of Si, 1.3 to 1.5 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, 0.02 to 0.05 percent of Alt, 0.01 to 0.03 percent of Nb0.03, 0.03 to 0.05 percent of Ti, less than or equal to 0.30 percent of Cr, 0.01 to 0.04 percent of Mo0.006 percent of N, and the balance of Fe and inevitable impurities.
Wherein the content of the first and second substances,
the hot-rolled wheel steel with the thickness of more than 10mm and the pressure of 690MPa is composed of fine-grained ferrite, pearlite and bainite, and the grain size of the fine-grained ferrite is 11-13 grades. The high-power structure of ferrite, bainite and pearlite is obtained through controlled rolling and controlled cooling, and the grain size of the fine-grain ferrite is 11-13 grades, so that the high tensile strength and the low yield ratio can be obtained, and the high-power structure has good fatigue resistance.
The volume fraction of the ferrite is 60-70%, the volume fraction of the pearlite is 5-10% and the volume fraction of the bainite is 20-30%. The proportion of the tissue band-shaped tissue is slight, so that the defects of cracking, layering and the like can be avoided after the spoke is punched by steel, the spoke has the performance characteristics of low yield ratio and high strength, and has better cold forming and longer fatigue life.
The hot-rolled wheel steel with the thickness of more than 10mm and 690MPa grade provided by the invention has the thickness of preferably 10-13 mm.
The component design and the process of the invention are based on the following principles:
c: the C element is the most main factor for ensuring the strength of the material, but the excessive use can reduce the toughness, and the low C equivalent is ensured by adopting the low C design in consideration of the welding requirement of the steel for the wheel, particularly the welding difficulty of the high-strength wheel, so the C content is controlled to be 0.05-0.08 percent in the invention.
Si: si is dissolved in ferrite and austenite to improve strength and hardness, but Si is easily oxidized into SiO2 with high melting point to affect welding performance, so that the Si content is controlled to be 0.03-0.15% in the invention.
Mn: the maximum role of Mn is to improve the hardenability of steel, and together with Mn, it is also an important solid-solution strengthening element. Mn is a carbide-forming element, can exist in a solid solution state, and also has an effect of refining a pearlite structure, so that the strength and hardness of ferrite and austenite can be improved. However, Mn is easily segregated in the continuous casting process, which has adverse effects on the properties of the steel sheet in the thickness direction and the fatigue life of the wheel steel, and the high Mn content makes the yield ratio of the steel sheet higher, which is not favorable for the forming of the steel sheet. Therefore, the Mn content is controlled to be 1.30-1.50% in the invention.
Nb: the Nb in the steel is characterized in that the recrystallization temperature of austenite is increased, so that the aim of refining austenite grains is fulfilled, the addition amount of Nb in the steel is generally below 0.05%, and the contribution of Nb higher than a secondary beam to strengthening and toughening is not obvious. Therefore, the Nb content is controlled to be 0.01-0.03 percent in the invention.
Ti: the Ti and C have strong binding force, and form a large amount of TiC particles which are dispersed and distributed in the process of molten steel solidification, so that the TiC particles can become solid crystal nuclei in the process of molten steel solidification, the crystallization of steel is facilitated, the structure of the steel is refined, the formation of coarse columnar crystals and dendritic crystal structures is reduced, the segregation can be reduced, the level of a banded structure is reduced, in addition, the Ti can be combined with N to produce a stable high-dispersion compound, and the process of converting pearlite into austenite can be slowed down by the Ti. Therefore, in the invention, the Ti content is controlled to be 0.03-0.05%.
Cr, Mo: cr is a carbide forming element, so that the strength, hardness and wear resistance of the steel can be obviously improved, and the oxidation resistance and corrosion resistance of the steel are improved. Mo can refine the crystal grains of the steel and improve the hardenability of the steel.
The invention also provides a manufacturing method of the 690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm, which comprises the following steps:
(1) continuously casting molten steel to obtain a continuous casting plate blank, wherein the molten steel comprises the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.03 to 0.15 percent of Si, 1.30 to 1.50 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, 0.02 to 0.05 percent of Alt, 0.01 to 0.03 percent of Nb0.03, 0.03 to 0.05 percent of Ti, less than or equal to 0.30 percent of Cr, 0.01 to 0.04 percent of Mo0.006 percent of N, and the balance of Fe and inevitable impurities;
(2) continuous casting: controlling the superheat degree at 10-20 ℃, and adopting dynamic soft pressure and electromagnetic stirring technology;
(3) heating: the soaking temperature of the heating furnace is 1220-;
(4) rough rolling: the rough rolling is 6-pass continuous rolling, the rolling is carried out at the temperature above the austenite recrystallization temperature, and the finishing temperature of the rough rolling is 1040-1080 ℃;
(5) finish rolling: the final rolling temperature is 840-860 ℃, and constant-speed rolling is adopted for finish rolling;
(6) laminar cooling: a segmented cooling mode is adopted, the air cooling time is more than or equal to 5s, and the air cooling temperature is 680-720 ℃;
(7) curling: the curling temperature is 400-500 ℃.
The beneficial effect of the invention is that,
(1) by reasonable design of components, low C, medium Mn, Ni-Ti compounding, small amount of Cr and MO content control, matching with continuous casting dynamic soft reduction and electromagnetic stirring technology, steel rolling temperature control, constant speed rolling and segmented cooling modes, hot rolled wheel steel with tensile strength of more than 10mm and 690MPa grade can be rolled and produced, and commercial vehicle spokes with high flaring rate requirements are manufactured;
(2) the structure of the invention is fine-grained ferrite, a small amount of pearlite and bainite, and the grain size of the ferrite in the structure is 11-13 grades; the steel can ensure that the spoke does not have the defects of cracking, layering and the like after being punched by steel, has the performance characteristics of low yield ratio and high strength, and has better cold forming and longer fatigue life; the yield strength ReL of the hot rolled steel plate with the thickness of 10mm is more than or equal to 480MPa, the tensile strength Rm is more than or equal to 690MPa, and the elongation A after fracture is more than or equal to 24 percent;
(3) the components and the manufacturing method can be adopted to effectively control the segregation of the casting blank and the grade of the banded structure in the structure so as to meet the problems of cracking of the central hole of the spoke, poor fatigue property and the like in the wheel forming process, the performance reaches the standard and is stable, and meanwhile, the welding requirement and the forming requirement in the wheel processing process can be well met.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a microstructure and morphology of a steel plate of example 1 under a metallographic microscope;
FIG. 2 is a microstructure and morphology diagram of a metallographic microscope of a steel plate according to example 2.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. 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.
Example 1
A690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm comprises the following chemical components in percentage by weight: 0.06% of C, 0.09% of Si, 1.47% of Mn1, 0.002% of S, 0.011% of P, 0.029% of Alt0.025% of Nb0.025% of Ti, 0.032% of Cr0.22% of Mo 0.02% of N0.0036% of Fe and inevitable impurities in balance. The thickness of the wheel steel is 10-13mm, and the thickness of the wheel steel is 11mm in the embodiment.
The manufacturing method comprises the following steps:
(1) smelting: adopting molten iron pretreatment (lime and particle magnesium pre-composite desulfurization), converter and LF furnace refining;
(2) continuous casting: adopting a 210 mm-230 mm continuous casting machine with electromagnetic stirring technology and high equipment precision under dynamic light pressure, and protecting casting in the whole process, wherein the low-power center segregation of the continuous casting is within C1.0 level;
(3) heating: in the furnace, the time is 235min, the soaking temperature of the heating furnace is 1250 ℃, the alloy elements are fully dissolved in solution, and the grain size of the original structure is effectively refined;
(4) rough rolling: carrying out rough rolling for 6 passes (1+5) of continuous rolling, rolling at the temperature above the austenite recrystallization temperature, and finishing the rough rolling at 1070 ℃;
(5) the final rolling temperature is 850 ℃, the constant-speed rolling is adopted for finish rolling, and the rolling speed of F7 with the thickness of 11mm is 2.5 m/s;
(6) a segmented cooling mode is adopted, the air cooling time is more than or equal to 5s, and the air cooling temperature is 710 ℃;
(7) coiling: the temperature was 450 ℃. The structure of the steel plate after cooling is fine grain ferrite, a small amount of pearlite and bainite, and the banded structure is less than 2 grades.
Example 2
A690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm comprises the following chemical components in percentage by weight: 0.07% of C, 0.14% of Si, 1.48% of Mn1, 0.002% of S, 0.014% of P, 0.032% of Alt0.032%, 0.022% of Nb0.034%, 0.24% of Cr0.24%, Mo0.02% of N, 0.0036% of N, and the balance of Fe and inevitable impurities. The thickness of the wheel steel is 10-13mm, and the thickness of the wheel steel is 11mm in the embodiment.
The manufacturing method comprises the following steps:
(1) smelting: adopting molten iron pretreatment (lime and particle magnesium pre-composite desulfurization), converter and LF furnace refining;
(2) continuous casting: adopting a 210 mm-230 mm continuous casting machine with electromagnetic stirring technology and high equipment precision under dynamic light pressure, and protecting casting in the whole process, wherein the low-power center segregation of the continuous casting is within C1.0 level;
(3) heating: in the furnace, the time is 235min, the soaking temperature of the heating furnace is 1260 ℃, alloy elements are fully dissolved in a solid manner, and the grain size of the original structure is effectively refined;
(4) rough rolling: carrying out rough rolling for 6 passes (1+5) of continuous rolling, rolling at the temperature above the austenite recrystallization temperature, and finishing the rough rolling at the temperature of 1060 ℃;
(5) finish rolling: the final rolling temperature is 845 ℃, the constant-speed rolling is adopted for finish rolling, and the rolling speed of F7 with the thickness of 11mm is 2.5 m/s;
(6) laminar cooling: a segmented cooling mode is adopted, the air cooling time is more than or equal to 5s, and the air cooling temperature is 700 ℃;
(7) coiling: the temperature was 460 ℃. The structure of the steel plate after cooling is fine grain ferrite, a small amount of pearlite and bainite, and the banded structure is less than 2 grades.
The hot rolled wheel steels of examples 1-2 had performance indexes as shown in Table 1.
TABLE 1
Figure BDA0002669667690000061
As can be seen from the table 1, the components and the manufacturing method of the invention can be used for effectively controlling the casting blank segregation and the level of the banded structure in the structure so as to meet the problems of cracking of a central hole of a spoke, poor fatigue property and the like in the wheel forming process, the performance reaches the standard and is stable, the yield strength ReL of a hot-rolled steel plate with the thickness of 10mm is more than or equal to 480MPa, the tensile strength Rm is more than or equal to 690MPa, and the elongation A after fracture is more than or equal to 24 percent; meanwhile, the welding requirement and the forming requirement in the wheel machining process can be well met.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. The 690 MPa-grade hot-rolled wheel steel with the thickness of more than 10mm is characterized by comprising the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.03 to 0.15 percent of Si, 1.3 to 1.5 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, 0.02 to 0.05 percent of Alt, 0.01 to 0.03 percent of Nb0.03, 0.03 to 0.05 percent of Ti, less than or equal to 0.30 percent of Cr, 0.01 to 0.04 percent of Mo0.006 percent of N, and the balance of Fe and inevitable impurities.
2. The hot-rolled wheel steel having a thickness of 10mm or more and 690MPa grade according to claim 1, wherein the structure of the hot-rolled wheel steel is fine-grained ferrite, pearlite and bainite.
3. The hot-rolled wheel steel with a thickness of more than 10mm and 690MPa according to claim 2, wherein the volume fraction of the fine-grained ferrite is 60-70%, the volume fraction of the pearlite is 5-10%, and the volume fraction of the bainite is 20-30%.
4. A hot-rolled wheel steel of grade 690MPa with a thickness of 10mm or more according to claim 3, wherein the grain size of the fine-grained ferrite is grade 11-13.
5. A method for manufacturing hot-rolled wheel steel with a thickness of more than 10mm and 690MPa according to any one of claims 1 to 4, comprising the steps of:
(1) continuously casting molten steel to obtain a continuous casting plate blank, wherein the molten steel comprises the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.03 to 0.15 percent of Si, 1.30 to 1.50 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, 0.02 to 0.05 percent of Alt, 0.01 to 0.03 percent of Nb0.03, 0.03 to 0.05 percent of Ti, less than or equal to 0.30 percent of Cr, 0.01 to 0.04 percent of Mo0.006 percent of N, and the balance of Fe and inevitable impurities;
(2) continuous casting: controlling the superheat degree at 10-20 ℃, and adopting dynamic soft pressure and electromagnetic stirring technology;
(3) heating: the soaking temperature of the heating furnace is 1220-;
(4) rough rolling: the rough rolling is 6-pass continuous rolling, the rolling is carried out at the temperature above the austenite recrystallization temperature, and the finishing temperature of the rough rolling is 1040-1080 ℃;
(5) finish rolling: the final rolling temperature is 840-860 ℃, and constant-speed rolling is adopted for finish rolling;
(6) laminar cooling: a segmented cooling mode is adopted, the air cooling time is more than or equal to 5s, and the air cooling temperature is 680-720 ℃;
(7) curling: the curling temperature is 400-500 ℃.
CN202010929396.3A 2020-09-07 2020-09-07 690 MPa-grade hot-rolled wheel steel with thickness of more than 10mm and manufacturing method thereof Pending CN112281051A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113073251A (en) * 2021-03-25 2021-07-06 山东钢铁集团日照有限公司 Manufacturing method of 590 MPa-grade hot-rolled complex phase steel for thick-specification high-fatigue-performance automobile spoke
CN114875333A (en) * 2022-05-31 2022-08-09 本钢板材股份有限公司 Manufacturing method of 650 MPa-grade steel for commercial vehicle rim

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103469057A (en) * 2013-09-07 2013-12-25 鞍钢股份有限公司 Steel for automobile wheel and production method of steel
CN111500924A (en) * 2020-04-15 2020-08-07 山东钢铁集团日照有限公司 High-strength wheel steel and production method thereof

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* Cited by examiner, † Cited by third party
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CN103469057A (en) * 2013-09-07 2013-12-25 鞍钢股份有限公司 Steel for automobile wheel and production method of steel
CN111500924A (en) * 2020-04-15 2020-08-07 山东钢铁集团日照有限公司 High-strength wheel steel and production method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113073251A (en) * 2021-03-25 2021-07-06 山东钢铁集团日照有限公司 Manufacturing method of 590 MPa-grade hot-rolled complex phase steel for thick-specification high-fatigue-performance automobile spoke
CN114875333A (en) * 2022-05-31 2022-08-09 本钢板材股份有限公司 Manufacturing method of 650 MPa-grade steel for commercial vehicle rim
CN114875333B (en) * 2022-05-31 2023-09-15 本钢板材股份有限公司 Manufacturing method of 650 MPa-level steel for commercial vehicle rim

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Application publication date: 20210129