CN112410651A - Preparation method of 550 MPa-grade excellent-performance steel strip for automobile transmission shaft pipe - Google Patents
Preparation method of 550 MPa-grade excellent-performance steel strip for automobile transmission shaft pipe Download PDFInfo
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- CN112410651A CN112410651A CN202011247699.3A CN202011247699A CN112410651A CN 112410651 A CN112410651 A CN 112410651A CN 202011247699 A CN202011247699 A CN 202011247699A CN 112410651 A CN112410651 A CN 112410651A
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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
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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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
- C21C7/06—Deoxidising, e.g. killing
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C22C38/002—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
- 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
- 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
- C22C38/12—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
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Abstract
The invention discloses a preparation method of a steel strip with excellent 550 MPa-level performance for an automobile transmission shaft tube, which adopts Nb + Ti component system design, has low alloy cost, adopts controlled rolling and controlled cooling technology, has the tensile strength of 620-680MPa, the yield strength of more than or equal to 500MPa and the elongation of more than or equal to 32 percent, and realizes larger economic benefit.
Description
Technical Field
The invention relates to the technical field of production of automobile shaft tube products, in particular to a preparation method of a 550 MPa-level steel strip with excellent performance for an automobile transmission shaft tube.
Background
The component for the shaft tube of the automobile transmission shaft is used as important connecting equipment of the whole automobile, and the torsion permanent deformation cannot occur in the service process. Therefore, the requirement of the automobile industry on the axle tube is high, and the axle tube also has high ductility and toughness and accurate dimensional accuracy on the premise of sufficient strength.
The prior patents are studied as follows:
the retrieved patent relates to a hot-rolled steel strip for an automobile transmission shaft pipe with 4-8mm yield strength and 440MPa level and a production method thereof, which mainly illustrate the research of high strength, good cold-working forming performance and welding performance in a laboratory, are suitable for materials such as steel for automobile structures, and the like, and have mechanical properties and technological properties meeting the technical requirements of the steel for the automobile axle pipe; the invention adopts Nb + Ti component system design, is stably produced on a 2250mm production line, can meet market demand and application, fills up the use demand of domestic high-grade transmission shaft tubes, and has potential application value.
The steel for the vanadium-containing automobile transmission shaft and the production method thereof are searched and patented, the V strengthening element is added, the steel plate for the vanadium-containing automobile transmission shaft with high strength and good toughness and plasticity is obtained, the tensile strength reaches 420-580MPa, the yield strength is not less than 360MPa, the elongation is not less than 26%, and the industrialization is realized.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for preparing a steel strip with excellent 550 MPa-level performance for an automobile transmission shaft and a shaft pipe.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a preparation method of a 550 MPa-grade steel strip with excellent performance for an automobile transmission shaft tube, which comprises the following steps:
smelting conditions are as follows: KR desulfurization treatment is carried out on the smelted molten iron, the sulfur content of the smelted molten iron fed into a converter is required to be less than or equal to 0.005 percent, and the cleaning area of desulfurized slag is more than 90 percent;
a converter process: the tapping temperature of the converter is more than or equal to 1620 ℃, and the coordinated tapping of the components and the temperature is ensured; if a new steel tapping hole or an abnormal turnover ladle is not formed, the tapping temperature is properly increased by 10-15 ℃ on the basis of the upper limit; adding aluminum iron, ferrosilicon and ferromanganese for deoxidation alloying in the converter tapping process;
a refining procedure: slagging, deoxidizing and desulfurizing in an LF furnace, and adding aluminum iron, ferromanganese, ferrosilicon and ferroniobium to adjust to a target component range;
RH process: the RH process is controlled according to the treatment mode, the vacuum degree is required to be less than or equal to 2.6mbar, and the vacuum maintaining time is more than or equal to 10 min; adding ferrotitanium alloy according to the components of molten steel during RH vacuum treatment to adjust the components; ensuring that the circulating pure degassing time is more than or equal to 8 min; after RH vacuum treatment is finished, calcium wires are fed for calcium treatment, and soft blowing time is ensured to be more than 15min after wire feeding;
and (3) continuous casting process: continuous casting production is carried out at a casting speed of 1.0-1.5 m/min;
a hot rolling procedure:
(1) the heating control point
In order to ensure the tapping temperature of the blank and the upper limit of the heating and soaking temperature, the specific process is shown in the following table:
(2) main point of rolling control
The specific process is shown in the following table:
wherein the total time of preheating, first-stage heating, second-stage heating and soaking is more than 120min in the heating control.
Further, the steel strip comprises the following chemical components in percentage by mass: c0.06-0.08%; 0.03-0.10% of Si; 1.30 to 1.40 percent of Mn; alt 0.020-0.050; 0.0010 to 0.0030 percent of Ca; 0.030 to 0.040 percent of Nb; ti 0.035-0.055%; h is less than or equal to 0.0002 percent; o is less than or equal to 0.002 percent; n is less than or equal to 0.006 percent; the balance being Fe and unavoidable other residual elements.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts Nb + Ti component system design, has low alloy cost, adopts rolling and cooling control technology, has tensile strength of 620-680MPa, yield strength of more than or equal to 500MPa and elongation of more than or equal to 32 percent, and realizes larger economic benefit.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Both fig. 1 and fig. 2 are microstructure diagrams of the steel strip.
Detailed Description
A design method of a steel belt for a 550 MPa-grade automobile transmission shaft tube comprises the following chemical components in percentage by mass: c0.06-0.08%; 0.03-0.10% of Si; 1.30 to 1.40 percent of Mn; alt 0.020-0.050; 0.0010 to 0.0030 percent of Ca; 0.030 to 0.040 percent of Nb; ti 0.035-0.055%; h is less than or equal to 0.0002 percent; o is less than or equal to 0.002 percent; n is less than or equal to 0.006 percent; the balance being Fe and unavoidable other residual elements.
Furthermore, a design method of the steel belt for the 550 MPa-level automobile transmission shaft tube is provided, which comprises the following specific production steps:
KR desulfurization-converter-LF furnace-RH-slab continuous casting
The method comprises the steps of heating furnace, rough rolling high-pressure water descaling, width fixing press, E1R1 rough rolling machine, E2R2 rough rolling machine (heat preservation cover), flying shear, finish rolling high-pressure water descaling, F1-F7 finishing rolling machine, encryption type laminar cooling, coiling, tray transportation system, sampling and inspection.
The specific process flow is as follows:
smelting conditions are as follows: KR desulfurization treatment is required to be carried out on the molten iron, the sulfur content of the molten iron fed into the converter is required to be less than or equal to 0.005%, and the slagging area of the desulfurized slag is larger than 90% (the amount of slag on the surface of the molten iron after slagging is less).
A converter process: the tapping temperature of the converter is more than or equal to 1620 ℃, and the coordinated tapping of the components and the temperature is ensured; if a new steel tapping hole or an abnormal turnover ladle is used, the tapping temperature is properly increased by 10-15 ℃ on the basis of the upper limit. Adding aluminum iron, ferrosilicon, ferromanganese and the like into the converter steel tapping process for deoxidation alloying.
A refining procedure: and (3) slagging, deoxidizing and desulfurizing in the LF furnace, and adding alloys such as aluminum iron, ferromanganese, ferrosilicon, ferrocolumbium and the like to adjust the range of target components.
RH process: the RH process is controlled according to the treatment mode, the vacuum degree is required to be less than or equal to 2.6mbar, and the vacuum maintaining time is more than or equal to 10 min. During RH vacuum treatment, ferrotitanium and other alloy are added to regulate the components based on the molten steel components. The time of circulating pure degassing is ensured to be more than or equal to 8 min. And after the RH vacuum treatment is finished, feeding a calcium wire for calcium treatment, and ensuring that the soft blowing time is more than 15min after wire feeding.
And (3) continuous casting process: continuous casting production is carried out at a casting speed of 1.0-1.5 m/min.
A hot rolling procedure:
(1) the heating control point
In order to ensure the tapping temperature of the blank, the upper limit of the heating and soaking temperature is set, and the specific process is shown in table 1.
TABLE 1 Process parameters of the furnace
(2) Main point of rolling control
In order to ensure the performance characteristics of the cast blank to the finished product, the specific process is shown in table 2.
TABLE 2 Rolling mill technological parameters
Examples analysis
(1) Mechanical properties
The transverse and longitudinal properties of the material are shown in Table 3, the allowance of each property is moderate, the transverse and longitudinal strength difference is small, and the use safety of downstream users can be ensured.
TABLE 3 Cross machine Direction tensile Properties
(2) Non-metallic inclusions
Inclusion control of the material as shown in table 4, the inclusion level control was better.
TABLE 4 distribution of inclusions
(3) Microstructure of
The microstructure of the steel strip is shown in figures 1 and 2 and mainly consists of uniform and fine ferrite, and the transverse and longitudinal tissues are uniform.
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 (2)
1. The preparation method of the steel strip with excellent 550 MPa-level performance for the axle tube of the automobile transmission shaft is characterized by comprising the following steps of:
smelting conditions are as follows: KR desulfurization treatment is carried out on the smelted molten iron, the sulfur content of the smelted molten iron fed into a converter is required to be less than or equal to 0.005 percent, and the cleaning area of desulfurized slag is more than 90 percent;
a converter process: the tapping temperature of the converter is more than or equal to 1620 ℃, and the coordinated tapping of the components and the temperature is ensured; if a new steel tapping hole or an abnormal turnover ladle is not formed, the tapping temperature is properly increased by 10-15 ℃ on the basis of the upper limit; adding aluminum iron, ferrosilicon and ferromanganese for deoxidation alloying in the converter tapping process;
a refining procedure: slagging, deoxidizing and desulfurizing in an LF furnace, and adding aluminum iron, ferromanganese, ferrosilicon and ferroniobium to adjust to a target component range;
RH process: the RH process is controlled according to the treatment mode, the vacuum degree is required to be less than or equal to 2.6mbar, and the vacuum maintaining time is more than or equal to 10 min; adding ferrotitanium alloy according to the components of molten steel during RH vacuum treatment to adjust the components; ensuring that the circulating pure degassing time is more than or equal to 8 min; after RH vacuum treatment is finished, calcium wires are fed for calcium treatment, and soft blowing time is ensured to be more than 15min after wire feeding;
and (3) continuous casting process: continuous casting production is carried out at a casting speed of 1.0-1.5 m/min;
a hot rolling procedure:
(1) the heating control point
In order to ensure the tapping temperature of the blank and the upper limit of the heating and soaking temperature, the specific process is shown in the following table:
(2) main point of rolling control
The specific process is shown in the following table:
wherein the total time of preheating, first-stage heating, second-stage heating and soaking is more than 120min in the heating control.
2. The method for preparing the steel strip for the 550 MPa-grade automobile transmission shaft tube with excellent performance as claimed in claim 1, wherein the steel strip comprises the following chemical components in percentage by mass: c0.06-0.08%; 0.03-0.10% of Si; 1.30 to 1.40 percent of Mn; alt 0.020-0.050; 0.0010 to 0.0030 percent of Ca; 0.030 to 0.040 percent of Nb; ti 0.035-0.055%; h is less than or equal to 0.0002 percent; o is less than or equal to 0.002 percent; n is less than or equal to 0.006 percent; the balance being Fe and unavoidable other residual elements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247699.3A CN112410651B (en) | 2020-11-10 | 2020-11-10 | Preparation method of 550 MPa-grade excellent-performance steel strip for automobile transmission shaft pipe |
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| CN202011247699.3A CN112410651B (en) | 2020-11-10 | 2020-11-10 | Preparation method of 550 MPa-grade excellent-performance steel strip for automobile transmission shaft pipe |
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| CN112410651A true CN112410651A (en) | 2021-02-26 |
| CN112410651B CN112410651B (en) | 2021-11-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005273007A (en) * | 2004-02-27 | 2005-10-06 | Jfe Steel Kk | Inner ring of constant velocity joint and manufacturing method therefor |
| CN103088257A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | High-strength steel for automobile transmission shaft axle tube |
| CN104962838A (en) * | 2015-06-18 | 2015-10-07 | 宝山钢铁股份有限公司 | High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip |
| CN109355563A (en) * | 2018-11-12 | 2019-02-19 | 包头钢铁（集团）有限责任公司 | The effective hot rolled strip of one kind 750MPa grades of truck drive shafts of 3 ~ 8mm tensile strength and its production method |
| CN109504898A (en) * | 2018-11-12 | 2019-03-22 | 包头钢铁（集团）有限责任公司 | The effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3 ~ 8mm yield strength and its production method |
-
2020
- 2020-11-10 CN CN202011247699.3A patent/CN112410651B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005273007A (en) * | 2004-02-27 | 2005-10-06 | Jfe Steel Kk | Inner ring of constant velocity joint and manufacturing method therefor |
| CN103088257A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | High-strength steel for automobile transmission shaft axle tube |
| CN104962838A (en) * | 2015-06-18 | 2015-10-07 | 宝山钢铁股份有限公司 | High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip |
| CN109355563A (en) * | 2018-11-12 | 2019-02-19 | 包头钢铁（集团）有限责任公司 | The effective hot rolled strip of one kind 750MPa grades of truck drive shafts of 3 ~ 8mm tensile strength and its production method |
| CN109504898A (en) * | 2018-11-12 | 2019-03-22 | 包头钢铁（集团）有限责任公司 | The effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3 ~ 8mm yield strength and its production method |
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