CN112322983A - Ti + Nb microalloyed component steel hot-rolled steel strip for steam shaft and preparation method thereof - Google Patents
Ti + Nb microalloyed component steel hot-rolled steel strip for steam shaft and preparation method thereof Download PDFInfo
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- CN112322983A CN112322983A CN202011262928.9A CN202011262928A CN112322983A CN 112322983 A CN112322983 A CN 112322983A CN 202011262928 A CN202011262928 A CN 202011262928A CN 112322983 A CN112322983 A CN 112322983A
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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
- C21D8/02—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
- 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
- C22C38/04—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
-
- 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
-
- 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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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a Ti + Nb microalloyed component hot rolled steel strip for a steam shaft and a preparation method thereof, wherein the hot rolled steel strip comprises the following chemical components in percentage by mass: c0.06-0.08%; 0.05 to 0.15 percent of Si; 1.50 to 1.70 percent of Mn1; alt0.020-0.050; ca0.0010-0.0030%; nb0.040-0.050%; ti0.070-0.090%; 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. The invention aims to provide a hot-rolled steel strip for a steam shaft steel with Ti + Nb microalloying components and a preparation method thereof, which adopt Nb + Ti component system design and have high economic benefit.
Description
Technical Field
The invention relates to the technical field of production of automobile shaft tube products, in particular to a Ti + Nb microalloying component hot-rolled steel strip for a steam shaft.
Background
The automobile industry in China has become an important support of national economy, but the market competition of the automobile industry is fierce, and automobile manufacturers need to improve the quality of products per se. The transmission shaft is an important part for transmitting power in an automobile transmission system, and the improvement of the quality of steel for the transmission shaft has important significance for improving the competitiveness of automobile manufacturing and automobile sales. The maximum working torque of steel pipes used by the transmission shaft tube in China is small, the strength level is low, and the requirement of light weight of a transmission shaft system cannot be met.
The prior patents are studied as follows:
the retrieved patent mainly discloses a vanadium-containing 700 MPa-level hot rolled steel strip for an automobile transmission shaft, a production method and application, and mainly discloses the vanadium-containing 700 MPa-level hot rolled steel strip for the automobile transmission shaft, which enables niobium, vanadium and titanium to fully play the roles of solid solution, precipitation and fine grain strengthening by the composite alloying of niobium, vanadium and titanium and utilizing the difference of precipitation temperatures of niobium, vanadium and titanium microalloy elements, thereby realizing the production of high-strength automobile transmission shaft tube steel; the invention adopts Ti + Nb component system design and combines controlled rolling and controlled cooling technology, compared with the method without adding noble metal element V, the invention has lower production cost, can realize low-cost high-steel grade transmission shaft steel, and further meets the requirement of light weight of a transmission shaft system.
The patent of retrieval is about a hot rolled steel strip for a 700 MPa-level automobile transmission shaft pipe with 3-8mm yield strength and a production method thereof, the hot rolled steel strip for the 700 MPa-level automobile transmission shaft pipe designed by Nb-Ti-Ce system is adopted, and the alloy cost is high. However, the invention adopts Nb + Ti component system design and combines the rolling and cooling control technology to realize the hot rolled steel strip for the shaft tube of the 700 MPa-level transmission shaft, and the economic benefit is high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a hot-rolled steel strip for a steam shaft steel with Ti + Nb microalloying components and a preparation method thereof, which adopt Nb + Ti component system design and have high economic benefit.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a Ti + Nb microalloying component hot rolled steel strip for a steam shaft, which comprises the following chemical components in percentage by mass: c0.06-0.08%; si 0.05-0.15%; 1.50 to 1.70 percent of Mn; alt 0.020-0.050; 0.0010 to 0.0030 percent of Ca; 0.040-0.050% of Nb; ti 0.070-0.090%; 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.
A preparation method of a hot rolled steel strip for Ti + Nb microalloyed component steam shaft steel comprises the following processes:
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, ferromanganese and the like into the converter steel tapping process for deoxidation alloying;
a refining procedure: slagging, deoxidizing and desulfurizing in an 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; 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) a heating system: selecting higher heating temperature to fully dissolve Ti and homogenize austenite of a casting blank, and controlling the target tapping temperature to be 1220-1260 ℃;
(2) a rolling system: preferably, a 3+3 or 1+5 rough rolling mode is adopted, so that enough deformation between passes is ensured to be tissue thinning; the finish rolling initial rolling temperature is controlled at 1010-1060 ℃, the nucleation rate of ferrite during phase transformation is increased, and the grains are further refined; the finish rolling temperature is controlled to be 850-880 ℃, and the coiling temperature is controlled to be 590-620 ℃ so as to be rapidly cooled to the phase transformation temperature after finish rolling, and fine grain structures are obtained.
Further, the rolling specifically includes:
the discharging temperature of the plate blank is controlled to be 1240 +/-20 ℃; the total time of preheating, first adding, second adding and soaking is more than 120 min.
Removing phosphorus by using high-pressure water;
the width of the press is fixed;
flying shears;
the rolling temperature of finish rolling is controlled at 1010-1060 ℃; the final rolling temperature is controlled at 850-880 ℃;
carrying out encrypted laminar cooling, and uniformly cooling the steel strip at a cooling speed of 20 ℃/s;
transporting the steel coil tray;
sampling and checking.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts Ti + Nb component system design and combines the rolling and cooling control technology to realize the hot rolled steel strip for the shaft tube of the 700 MPa-level transmission shaft, thereby meeting the requirement of light weight of the transmission shaft system and having high economic benefit.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a microstructure of a steel strip according to the present invention.
Detailed Description
The following are preferred embodiments of the present invention, and do not limit the scope of the present invention.
A design method of a hot rolled steel strip for a steam shaft containing Ti + Nb microalloying components comprises the following chemical components in percentage by mass: c0.06-0.08%; si 0.05-0.15%; 1.50 to 1.70 percent of Mn; alt 0.020-0.050; 0.0010 to 0.0030 percent of Ca; 0.040-0.050% of Nb; ti 0.070-0.090%; 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, the hot rolled steel strip for the steam shaft with the Ti + Nb microalloying components comprises the following specific steps:
and (4) LF furnace: adding alloy of aluminum iron, manganese iron, ferrosilicon, ferrocolumbium and the like to adjust the range of target components.
Continuous casting: the liquidus temperature of the steel grade is 1519 ℃, and continuous casting production is carried out at the drawing speed of 1.0m/min-1.5 m/min.
Hot rolling: selecting higher heating temperature to fully dissolve Ti and homogenize austenite of a casting blank, and controlling the target tapping temperature to be 1220-1260 ℃; preferably, a 3+3 or 1+5 rough rolling mode is adopted, so that enough deformation between passes is ensured to be tissue thinning; the finish rolling initial rolling temperature is controlled at 1010-1060 ℃, the nucleation rate of ferrite during phase transformation is increased, and the grains are further refined; the finish rolling temperature is controlled to be 850-880 ℃, and the coiling temperature is controlled to be 590-620 ℃ so as to be rapidly cooled to the phase transformation temperature after finish rolling, and fine grain structures are obtained.
Preferably, the rolling specifically comprises:
the discharging temperature of the plate blank is controlled to be 1240 +/-20 ℃; the total time of preheating, first adding, second adding and soaking is more than 120 min.
Removing phosphorus by using high-pressure water;
the width of the press is fixed;
flying shears;
the rolling temperature of finish rolling is controlled at 1010-1060 ℃; the final rolling temperature is controlled at 850-880 ℃;
carrying out encrypted laminar cooling, and uniformly cooling the steel strip at a cooling speed of 20 ℃/s;
transporting the steel coil tray;
sampling and checking.
The invention aims to provide a Ti + Nb microalloying component hot rolled steel strip for a steam shaft.
The invention is further illustrated by the following examples:
examples analysis
According to the production requirements, the components of the product are shown in table 1, the corresponding mechanical properties are shown in table 2, the microstructure of the steel strip is shown in fig. 1, the steel strip mainly comprises ferrite and a small amount of bainite, the structure is distributed uniformly, and the margin of performance indexes is moderate.
Table 1 chemical composition units: is based on
TABLE 2 comparison of tensile Properties
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 (3)
1. The Ti + Nb microalloyed component hot rolled steel strip for the steam shaft is characterized by comprising the following chemical components in percentage by mass: c0.06-0.08%; si 0.05-0.15%; 1.50 to 1.70 percent of Mn; alt 0.020-0.050; 0.0010 to 0.0030 percent of Ca; 0.040-0.050% of Nb; ti 0.070-0.090%; 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.
2. The method for producing the hot-rolled steel strip for a Ti + Nb microalloyed steam shaft steel according to claim 1, characterized by comprising the 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, ferromanganese and the like into the converter steel tapping process for deoxidation alloying;
a refining procedure: slagging, deoxidizing and desulfurizing in an 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; 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) a heating system: selecting higher heating temperature to fully dissolve Ti and homogenize austenite of a casting blank, and controlling the target tapping temperature to be 1220-1260 ℃;
(2) a rolling system: preferably, a 3+3 or 1+5 rough rolling mode is adopted, so that enough deformation between passes is ensured to be tissue thinning; the finish rolling initial rolling temperature is controlled at 1010-1060 ℃, the nucleation rate of ferrite during phase transformation is increased, and the grains are further refined; the finish rolling temperature is controlled to be 850-880 ℃, and the coiling temperature is controlled to be 590-620 ℃ so as to be rapidly cooled to the phase transformation temperature after finish rolling, and fine grain structures are obtained.
3. The method for producing the hot-rolled steel strip for a Ti + Nb microalloyed steel for a steam shaft according to claim 2, wherein the rolling specifically includes:
the discharging temperature of the plate blank is controlled to be 1240 +/-20 ℃; the total time of preheating, first adding, second adding and soaking is more than 120 min.
Removing phosphorus by using high-pressure water;
the width of the press is fixed;
flying shears;
the rolling temperature of finish rolling is controlled at 1010-1060 ℃; the final rolling temperature is controlled at 850-880 ℃;
carrying out encrypted laminar cooling, and uniformly cooling the steel strip at a cooling speed of 20 ℃/s;
transporting the steel coil tray;
sampling and checking.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262928.9A CN112322983A (en) | 2020-11-12 | 2020-11-12 | Ti + Nb microalloyed component steel hot-rolled steel strip for steam shaft and preparation method thereof |
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| CN202011262928.9A CN112322983A (en) | 2020-11-12 | 2020-11-12 | Ti + Nb microalloyed component steel hot-rolled steel strip for steam shaft and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943892A (en) * | 2021-09-16 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | Preparation method of low-cost Ti microalloyed thin 700 MPa-grade steel belt for automobile crossbeam |
| CN114032458A (en) * | 2021-10-26 | 2022-02-11 | 包头钢铁（集团）有限责任公司 | Preparation method of hot-rolled steel strip with yield strength of 620MPa for thin-specification concrete mixing tank |
| CN114645188A (en) * | 2022-02-08 | 2022-06-21 | 包头钢铁（集团）有限责任公司 | Method for efficiently producing hot-rolled steel strip for 2-4 mm extreme thin-specification high-quality stirring tank with tensile strength of 650MPa |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6439351A (en) * | 1987-08-04 | 1989-02-09 | Sumitomo Metal Ind | High strength and high toughness case hardening steel for ball cage |
| JP2004360034A (en) * | 2003-06-06 | 2004-12-24 | Sanyo Special Steel Co Ltd | Free cutting precipitation hardening type stainless steel |
| CN101805873A (en) * | 2009-10-30 | 2010-08-18 | 莱芜钢铁股份有限公司 | Low-cost and high-strength steel for automobile crossbeam and manufacturing method thereof |
| CN103088257A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | High-strength steel for automobile transmission shaft axle tube |
| CN111020408A (en) * | 2019-12-31 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Thick-specification low-temperature-resistant and tough hot-rolled steel strip for natural gas conveying pipe and preparation method thereof |
| JP2020139185A (en) * | 2019-02-27 | 2020-09-03 | Ｊｆｅスチール株式会社 | Production method of case hardening steel |
-
2020
- 2020-11-12 CN CN202011262928.9A patent/CN112322983A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6439351A (en) * | 1987-08-04 | 1989-02-09 | Sumitomo Metal Ind | High strength and high toughness case hardening steel for ball cage |
| JP2004360034A (en) * | 2003-06-06 | 2004-12-24 | Sanyo Special Steel Co Ltd | Free cutting precipitation hardening type stainless steel |
| CN101805873A (en) * | 2009-10-30 | 2010-08-18 | 莱芜钢铁股份有限公司 | Low-cost and high-strength steel for automobile crossbeam and manufacturing method thereof |
| CN103088257A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | High-strength steel for automobile transmission shaft axle tube |
| JP2020139185A (en) * | 2019-02-27 | 2020-09-03 | Ｊｆｅスチール株式会社 | Production method of case hardening steel |
| CN111020408A (en) * | 2019-12-31 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Thick-specification low-temperature-resistant and tough hot-rolled steel strip for natural gas conveying pipe and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943892A (en) * | 2021-09-16 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | Preparation method of low-cost Ti microalloyed thin 700 MPa-grade steel belt for automobile crossbeam |
| CN114032458A (en) * | 2021-10-26 | 2022-02-11 | 包头钢铁（集团）有限责任公司 | Preparation method of hot-rolled steel strip with yield strength of 620MPa for thin-specification concrete mixing tank |
| CN114645188A (en) * | 2022-02-08 | 2022-06-21 | 包头钢铁（集团）有限责任公司 | Method for efficiently producing hot-rolled steel strip for 2-4 mm extreme thin-specification high-quality stirring tank with tensile strength of 650MPa |
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