CN112226672A - Method for producing anti-aging low-carbon steel by adopting ferrite rolling process - Google Patents

Method for producing anti-aging low-carbon steel by adopting ferrite rolling process Download PDF

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Publication number
CN112226672A
CN112226672A CN202010928552.4A CN202010928552A CN112226672A CN 112226672 A CN112226672 A CN 112226672A CN 202010928552 A CN202010928552 A CN 202010928552A CN 112226672 A CN112226672 A CN 112226672A
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percent
equal
less
low
carbon steel
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Inventor
陈潮
欧阳页先
郑泽林
孙向阳
李亮
金柱元
韩翔
陈传敬
赵锐
季长恩
丁继师
翟兵
张培楠
林佳锋
赵景全
秦哲
陈良
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Rizhao Steel Holding Group Co Ltd
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Rizhao Steel Holding Group Co Ltd
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Priority to CN202010928552.4A priority Critical patent/CN112226672A/en
Publication of CN112226672A publication Critical patent/CN112226672A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/004Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

Abstract

The invention relates to the technical field of low-carbon steel production, in particular to a method for producing anti-aging low-carbon steel by adopting a ferrite rolling process. Specifically, the low-carbon steel comprises the following chemical components in percentage by mass: c is more than 0.003 percent and less than or equal to 0.060 percent, Si is less than or equal to 0.10 percent, Mn is less than or equal to 0.25 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.03 percent, Alt is less than or equal to 0.05 percent, B is more than or equal to 0.0015 percent and less than or equal to 0.0050 percent, N is less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities are smelted, cast, rolled and coiled to prepare the strip. The low-carbon steel produced by the process has good anti-aging performance and better mechanical property, greatly reduces the production cost, and realizes the double-effect win-win of reducing the cost and improving the quality.

Description

Method for producing anti-aging low-carbon steel by adopting ferrite rolling process
Technical Field
The invention relates to the technical field of low-carbon steel production, in particular to a method for producing anti-aging low-carbon steel by adopting a ferrite rolling process.
Background
With the gradual transformation and upgrade of iron and steel enterprises to resource conservation, environmental friendliness, strong innovation activity, good economic benefit and international competitiveness and the increasing market demand for ultrathin hot-rolled thin plates with good deep drawing performance, the low-cost, high-performance, economical and environment-friendly hot-rolled thin strip steel technology gradually becomes the development trend of the future hot-rolled low-carbon strip steel.
The ferrite rolling process is a controlled rolling technology for low-carbon steel series, and is characterized by that the strip steel is roughly rolled in the fully-austenitic state by controlling temperature, and is finely rolled in the completely-ferritic or mostly-ferritic state. The ferrite rolling process has the advantages of low heating temperature, low rolling temperature, thin iron oxide scale on the surface of the steel plate, good mechanical properties of hot-rolled and cold-rolled finished steel plates and the like, can produce the ultra-thin hot-rolled low-carbon steel plate to replace the traditional cold rolling and annealing process, can partially replace cold-rolled products, and is the best choice for profitable strip steel production. In recent decades, through continuous theoretical research and industrial practice of people, a complete technical system is basically formed by the ferrite rolling process, and the ferrite rolling process becomes an effective production process for economically producing ultrathin hot-rolled low-carbon strip steel with good performance.
At present, some reports related to the application of a ferrite rolling process to a traditional hot rolling production line and a short-flow continuous casting and rolling production line for producing low-carbon steel can produce low-carbon strip steel with low strength, low yield ratio and high elongation, and the forming performance of the product can be improved by controlling the content of C, N and other elements through an ultra-low carbon smelting technology and a clean steel production technology. Under an ultra-low carbon component system, alloy elements such as Ti, Nb and the like are added, the product also has anti-aging performance, but only specific products can have anti-aging performance, and the forming performance or anti-aging performance of the products is improved, so that the production cost is greatly increased, and the double-effect win of cost control and quality improvement cannot be realized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for producing anti-aging low-carbon steel by adopting a ferrite rolling process, so that all low-carbon steel products have anti-aging performance, the product forming performance is improved, and the cost is reduced.
The low-carbon steel produced by the existing ferrite rolling process obviously increases the production cost by a method of improving the product forming performance by reducing the content of C, N and other elements, at present, only the product of ultralow-carbon alloy added with Ti/Nb and the like has timeliness, and other products do not have timeliness resistance, but the addition of Ti, Nb and other alloys can obviously increase the production cost.
The technical scheme of the invention is as follows:
a method for producing anti-aging low-carbon steel by adopting a ferrite rolling process comprises the following steps:
the low-carbon steel comprises the following chemical components in percentage by mass: c is more than 0.003 percent and less than or equal to 0.060 percent, Si is less than or equal to 0.10 percent, Mn is less than or equal to 0.25 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.03 percent, Alt is less than or equal to 0.05 percent, B is more than or equal to 0.0015 percent and less than or equal to 0.0050 percent, N is less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities are smelted, cast, rolled and coiled to prepare the strip.
And the finish rolling temperature in the rolling process is 750-830 ℃.
Preferably, the content of B and the finishing temperature can be divided into the following components according to the different contents of C and N:
(1) when the content of C is 0.030 percent and less than or equal to 0.060 percent and the content of N is less than or equal to 0.008 percent, the content of B is 0.0032 percent and less than or equal to 0.0050 percent, and the finishing temperature is 750-810 ℃;
(2) when the content of C is 0.010 percent and less than or equal to 0.030 percent and the content of N is less than or equal to 0.005 percent, the content of B is 0.0020 percent and less than or equal to 0.0032 percent and the finishing temperature is 760-820 ℃;
(3) when C is more than 0.003 percent and less than or equal to 0.010 percent and N is less than or equal to 0.003 percent, B is more than or equal to 0.0015 percent and less than or equal to 0.0020 percent and the finishing temperature is 770-830 ℃.
The coiling temperature is 650-730 ℃.
The thickness of the steel strip is 0.6-4.0 mm.
The action and mechanism of the main elements in the invention are as follows:
c: the C has obvious influence on the transformation point of the steel, is one of key elements for determining a ferrite rolling process window, generally increases along with the content of the C, reduces the ferrite temperature range and reduces the transformation temperature from austenite to ferrite. Along with the reduction of the temperature, the yield stress of the steel is increased, so that the rolling force is increased, the deformation is difficult, the stable operation of the rolling process cannot be ensured, the finished product structure is not uniform, and the manufacturing cost of the steel is increased rapidly because the C content is controlled to be too low in the smelting process, for example, the C is less than or equal to 0.003 percent, so that the C content is controlled to be less than or equal to 0.06 percent in the invention.
N: the N and C atoms have two existence forms: one is in a solid solution state, and the other is in a precipitated state. The solid solution C, N not only seriously impairs the formability of the steel, but also, when C and N atoms interact with dislocations to form Cottrell air masses, the steel undergoes plastic deformation and undergoes strain aging after being left at room temperature for a long time or after being heated slightly, and the strength and hardness thereof increase and the plasticity and toughness thereof decrease.
B: b can form Fe-C-B type compounds and Fe-O-B type compounds with elements such as Fe, C, N, O and the like in steel, and is more easily combined with free N compared with Al, B and N are desolventized from a matrix to form coarse BN particles, thereby inhibiting the precipitation of fine AlN in the steel, coarsening crystal grains, reducing the yield strength of the steel and eliminating the aging phenomenon of the steel.
P and S: p and S are residual harmful elements in molten iron, and P is less than or equal to 0.020% and S is less than or equal to 0.030% in the invention in order to ensure the production stability and the forming performance of steel.
The beneficial effect of the invention is that,
(1) compared with the production process of the alloy of ultra-low carbon + Ti/Nb and the like, the invention does not adopt ultra-low carbon components, does not add high-cost alloy of Ti/Nb and the like, but adds a small amount of low-price B alloy, promotes the formation of C, N compound, obviously reduces the strength of steel, has uniform grain size, is in a specification polygon shape, and effectively improves the forming performance; meanwhile, the content of B and the finish rolling temperature are selected according to the content of C and N, so that the stability of the test is facilitated, the anti-aging effect is achieved, and the cost is greatly reduced;
(2) the steel is subjected to 2h, 100 ℃ water bath aging tests and 20min and 35min 200 ℃ heating aging tests respectively, so that the strength and the elongation rate are not obviously changed, and the steel has good anti-aging property;
(3) compared with other ferrite rolling processes, the invention not only improves the forming performance of steel, but also has excellent anti-aging performance, and more importantly, the invention reduces the smelting cost by reducing the requirement on the content of C, reduces the alloy cost by adding B alloy, designs reasonable components and hot rolling process, and effectively reduces the production cost while obtaining the steel with excellent performance;
(4) the low-carbon steel produced by the method reduces the yield strength and the tensile strength, improves the elongation rate, has more excellent mechanical properties, has low energy consumption, is environment-friendly and economical, and realizes the double-effect win-win of reducing the cost and improving the quality.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments 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
A method for producing anti-aging low-carbon steel by adopting a ferrite rolling process comprises the following steps:
the low-carbon steel comprises the following chemical components in percentage by mass: c: 0.060%, Si: 0.10%, Mn: 0.23%, P: 0.017%, S: 0.03%, Alt: 0.047%, B: 0.0048%, N: 0.008 percent and the balance of Fe and inevitable impurities, and smelting, casting, rolling and coiling the mixture to prepare the strip steel with the thickness of 1.5mm, wherein the final rolling temperature is 755 ℃, and the coiling temperature is 680 ℃.
Example 2
A method for producing anti-aging low-carbon steel by adopting a ferrite rolling process comprises the following steps:
the low-carbon steel comprises the following chemical components in percentage by mass: c: 0.025%, Si: 0.07%, Mn: 0.19%, P: 0.018%, S: 0.027%, Alt: 0.048%, B: 0.0030%, N: 0.005 percent, and the balance of Fe and inevitable impurities, and the strip steel with the thickness of 1.5mm is prepared after smelting, casting, rolling and coiling. Wherein the finishing temperature is 780 ℃ and the coiling temperature is 710 ℃.
Example 3
A method for producing anti-aging low-carbon steel by adopting a ferrite rolling process comprises the following steps:
the low-carbon steel comprises the following chemical components in percentage by mass: c: 0.008%, Si: 0.10%, Mn: 0.25%, P: 0.020%, S: 0.03%, Alt: 0.05%, B: 0.0019%, N: 0.003 percent of Fe and inevitable impurities, and smelting, casting, rolling and coiling the mixture to prepare the strip steel with the thickness of 1.5mm, wherein the finishing temperature is 820 ℃ and the coiling temperature is 720 ℃.
Comparative example 1
The low-carbon steel strip comprises the following chemical components in percentage by mass: c: 0.008%, Si: 0.10%, Mn: 0.25%, P: 0.020%, S: 0.03%, Alt: 0.05%, N: 0.003 percent and is obtained by adopting an austenite rolling process.
Comparative example 2
The low-carbon steel comprises the following chemical components in percentage by mass: c: 0.008%, Si: 0.10%, Mn: 0.25%, P: 0.020%, S: 0.03%, Alt: 0.05%, N: 0.003 percent of Fe and inevitable impurities, and smelting, casting, rolling and coiling the mixture to prepare the strip steel with the thickness of 1.5mm, wherein the finishing temperature is 805 ℃ and the coiling temperature is 698 ℃.
TABLE 1
As can be seen from Table 1, compared with the austenite rolling process adopted in the comparative example 1, the yield strength of the low-carbon steel produced by the invention can be reduced by 60-120 MPa, the tensile strength can be reduced by 30-70 MPa, the elongation can be improved by 5-15%, and the mechanical property of the steel is better.
Compared with the comparative example 2, the invention optimizes ferrite technological parameters and formula composition, further reduces the strength of ferrite, obviously improves the elongation, reduces the yield strength of the low-carbon steel produced by the invention by 20-90 MPa, reduces the tensile strength by 10-50 MPa, improves the elongation by 5-10 percent, and has obvious anti-aging effect.
It can be seen from comparative examples 1 and 2 that the strength of the austenitic low carbon steel can be reduced by using the ferrite process, but the elongation is not improved and the aging is not remarkably improved. By adopting the ferrite process and the B alloy, the strength of ferrite is further reduced, the elongation is obviously improved, and the anti-aging effect is obvious.
Although the present invention has been described in detail by way of 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 (6)

1. A method for producing anti-aging low-carbon steel by adopting a ferrite rolling process is characterized by comprising the following steps:
the low-carbon steel comprises the following chemical components in percentage by mass: c is more than 0.003 percent and less than or equal to 0.060 percent, Si is less than or equal to 0.10 percent, Mn is less than or equal to 0.25 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.03 percent, Alt is less than or equal to 0.05 percent, B is more than or equal to 0.0015 percent and less than or equal to 0.0050 percent, N is less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities are smelted, cast, rolled and coiled to prepare the strip.
2. The method for producing the anti-aging low-carbon steel by adopting the ferrite rolling process according to claim 1, wherein the finish rolling temperature in the rolling process is 750-830 ℃.
3. The method for producing the anti-aging low carbon steel by adopting the ferrite rolling process as claimed in claim 1, wherein when 0.030% < C < 0.060% and N < 0.008%, 0.0032% < B < 0.0050% and the finishing temperature is 750-810 ℃.
4. The method for producing the anti-aging low-carbon steel by adopting the ferrite rolling process as claimed in claim 1, wherein when 0.010% < C < 0.030% and N < 0.005%, 0.0020% < B < 0.0032% and the finish rolling temperature is 760-820 ℃.
5. The method for producing the anti-aging low-carbon steel by adopting the ferrite rolling process as claimed in claim 1, wherein when C is more than 0.003% and less than or equal to 0.010% and N is less than or equal to 0.003%, B is more than or equal to 0.0015% and less than or equal to 0.0020%, and the finishing rolling temperature is 770-830 ℃.
6. The method for producing the anti-aging low-carbon steel by adopting the ferrite rolling process according to claim 1, wherein the coiling temperature is 650-730 ℃.
CN202010928552.4A 2020-09-07 2020-09-07 Method for producing anti-aging low-carbon steel by adopting ferrite rolling process Pending CN112226672A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007004322A1 (en) * 2005-07-04 2007-01-11 Sumitomo Metal Industries, Ltd. High-tensile cold-rolled steel sheet, high-tensile plated steel sheet and process for producing them
CN101293321A (en) * 2008-06-25 2008-10-29 钢铁研究总院 Hot rolled steel plate for punch process and method of manufacturing the same
CN101798655A (en) * 2010-04-16 2010-08-11 北京科技大学 Micro-carbon aluminum-killed steel with low yield ratio and good deep drawing property and preparation method thereof
CN105256223A (en) * 2015-11-12 2016-01-20 首钢总公司 Micro-carbon steel with low yield strength and production method thereof
CN107597844A (en) * 2017-10-16 2018-01-19 北京科技大学 The ferrite rolling method and apparatus that endless casting rolling deep-draw is rolled up with humble carbon steel
CN111074163A (en) * 2019-12-20 2020-04-28 唐山钢铁集团高强汽车板有限公司 Anti-aging low-carbon Al killed steel strip and production method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007004322A1 (en) * 2005-07-04 2007-01-11 Sumitomo Metal Industries, Ltd. High-tensile cold-rolled steel sheet, high-tensile plated steel sheet and process for producing them
CN101293321A (en) * 2008-06-25 2008-10-29 钢铁研究总院 Hot rolled steel plate for punch process and method of manufacturing the same
CN101798655A (en) * 2010-04-16 2010-08-11 北京科技大学 Micro-carbon aluminum-killed steel with low yield ratio and good deep drawing property and preparation method thereof
CN105256223A (en) * 2015-11-12 2016-01-20 首钢总公司 Micro-carbon steel with low yield strength and production method thereof
CN107597844A (en) * 2017-10-16 2018-01-19 北京科技大学 The ferrite rolling method and apparatus that endless casting rolling deep-draw is rolled up with humble carbon steel
CN111074163A (en) * 2019-12-20 2020-04-28 唐山钢铁集团高强汽车板有限公司 Anti-aging low-carbon Al killed steel strip and production method thereof

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