CN112553531A - Low-cost hot forming steel for pipe making and production and preparation method thereof - Google Patents
Low-cost hot forming steel for pipe making and production and preparation method thereof Download PDFInfo
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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
- 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
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses low-cost hot formed steel for pipe making, which comprises the following chemical components in percentage by weight: 0.19 to 0.28 percent of C; 0.20 to 0.29 percent of Si; 1.5 to 2.0 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.006 percent; 0.02 to 0.06 percent of Al; 0.01 to 0.03 percent of Ti; n is less than or equal to 0.004 percent, and the balance of Fe and inevitable impurities. According to the low-cost hot forming steel for pipe making and the production and preparation method thereof, the tensile strength of the hot forming steel after the hot forming process reaches 1500MPa or above, the elongation is more than or equal to 5%, the hot forming steel with excellent performance is produced at low alloy cost, the defects of cracking, resilience and the like can be effectively reduced in the hot forming process, and the requirements of vehicle body light weight and the like on high-strength steel are met.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to low-cost hot forming steel for pipe making and a production and preparation method thereof.
Background
With the enhancement of environmental awareness and the increasing requirements for automobile safety, automobile manufacturers put more emphasis on reducing fuel consumption and reducing exhaust emission of engines through light weight of automobiles. In order to ensure that the automobile can still meet the collision safety performance after being lightened, various large automobile companies have turned the work emphasis to the application of a new material and new technology while optimizing the automobile frame and structure. In the aspect of producing vehicle body structures such as bumpers, cross beams, anti-collision beams and the like, the strength of the vehicle body structural member is improved by adopting advanced ultrahigh-strength and high-toughness steel, and the requirement of light weight is met.
At present, the high-strength and tough steel at 1500MPa level which is widely applied is mostly MnB series steel, and the hardenability is improved by controlling the proportion of B and Mn elements, so that the purpose of transforming most of austenite into martensite after the hot forming process is achieved. However, the MnB steel is still difficult to solve the problem of forming a hollow structural member requiring high strength, and the alloy cost is high. Therefore, in order to meet the requirements of vehicle body light weight and the like on high-strength steel and to break the industrial bottleneck that the high-strength steel cannot be applied to the production of high-strength hollow structural members at present, the development of the low-cost hot forming steel for pipe making and the production and preparation method thereof are urgently needed.
Disclosure of Invention
The invention aims to provide the low-cost hot forming steel for pipe making and the production and preparation method thereof, the tensile strength of the hot forming steel after the hot forming process reaches 1500MPa or above, and the elongation is more than or equal to 5%.
The technical scheme adopted by the invention for solving the technical problems is as follows: the low-cost hot formed steel for pipe making comprises the following chemical components in percentage by weight:
0.19 to 0.28 percent of C; 0.20 to 0.29 percent of Si; 1.5 to 2.0 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.006 percent; 0.02 to 0.06 percent of Al; 0.01 to 0.03 percent of Ti; n is less than or equal to 0.004 percent, and the balance of Fe and inevitable impurities.
A production method of low-cost hot forming steel for pipe making comprises the following steps:
smelting the molten steel and casting into a continuous casting billet;
hot rolling the continuous casting billet to obtain a hot rolled plate;
carrying out acid rolling on the hot rolled plate to obtain a cold-hard steel strip;
and annealing the cold-hard steel strip to obtain hot formed steel, and then finishing, inspecting a finished product, packaging and leaving a factory.
Further, the smelting and casting into a continuous casting billet specifically comprises the following steps:
smelting the molten steel by a converter, and casting into a continuous casting blank by adopting a continuous casting mode.
Further, in the hot rolling process, the heating temperature of a hot rolling casting blank is 1200-1250 ℃, the hot rolling finishing temperature is 860-900 ℃, and the coiling temperature is 595-625 ℃.
Further, in the acid rolling process, the acid rolling deformation is 50% -80%, and the flat elongation is 0.6% -0.9%.
Further, the annealing process includes: heating the cold-hardened steel strip to 770-790 ℃; cooling the cold-hard steel strip after heat preservation to 440-460 ℃ at a cooling rate of 17-20 ℃/s, and then air-cooling until the temperature of the steel strip is lower than 150 ℃.
Further, the thickness of the hot forming steel finished product is 0.5mm-2.5 mm.
The invention has the following beneficial effects: according to the low-cost hot forming steel for pipe making and the production and preparation method thereof, the tensile strength of the hot forming steel after the hot forming process reaches 1500MPa or above, the elongation is more than or equal to 5%, the hot forming steel with excellent performance is produced at low alloy cost, the defects of cracking, resilience and the like can be effectively reduced in the hot forming process, and the requirements of vehicle body light weight and the like on high-strength steel are met.
Drawings
FIG. 1 is a microstructure diagram of a low-cost hot-formed steel for pipe production according to example 1 of the present invention.
Detailed Description
The invention provides the low-cost hot formed steel for pipe making and the production and preparation method thereof, the hot formed steel with excellent performance is produced at low alloy cost, the defects of cracking, resilience and the like can be effectively reduced in the hot forming process, and the requirements of vehicle body light weight and the like on high-strength steel are met.
In order to solve the technical problems, the technical scheme in the embodiment of the invention has the following general idea: the hot forming steel takes C-Si-Mn as a basic alloy system, and the specific element proportion and the main function thereof are described in detail in the following.
0.19 to 0.28 percent of C; 0.20 to 0.29 percent of Si; 1.5 to 2.0 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.006 percent; 0.02 to 0.06 percent of Al; 0.01 to 0.03 percent of Ti; n is less than or equal to 0.004 percent, and the balance of Fe and inevitable impurities.
The C element is a solid solution strengthening element and can effectively improve the strength of the steel. If the content of C is too low, the martensite proportion of the steel plate after the hot forming process is low, and the strength of the steel plate can not meet the requirement. However, the C content ratio is too high, which decreases the elongation of the steel sheet and increases the brittleness. Comprehensively considered, the C content in the invention is controlled to be 0.19-0.28%.
The Si element as a deoxidizing element can effectively reduce impurities of steel grades, but as the Si element content increases, the plasticity, surface quality and weldability of the steel sheet decrease, and the formability is finally affected. The content of Si element in the invention is controlled between 0.20 percent and 0.29 percent.
The Mn element is also a main solid solution strengthening element, can improve hardenability by reducing phase transformation driving force, can effectively improve the martensite ratio under a certain annealing process condition, and obviously improves the strength. However, too high a content ratio of Mn may degrade the uniformity of properties and weldability. The content of Mn element in the invention is controlled to be 1.5-2.0%.
The Al element is a commonly used deoxidizer in the steel smelting process, and can effectively reduce impurities in the steel. However, improper control of Al element can cause the problems of water gap blockage, excessive inclusions and the like in the continuous casting process. The Al element content is controlled to be 0.02-0.06%.
The Ti element has obvious effect on grain refinement, and can effectively inhibit grain coarsening in the subsequent hot forming process. And the Ti element can improve the high-temperature creep resistance and the high-temperature endurance strength of the hot forming steel. However, if the content of Ti is too high, the elongation of the hot formed steel is remarkably lowered, and the content of Ti added as a trace element needs to be strictly controlled. The content of Ti in the invention is controlled to be 0.01-0.03%.
P, S, N elements are all harmful elements in steel, P element increases cold brittleness, S element increases hot brittleness, N element increases strength, and three elements can reduce plasticity of steel. Therefore, the content of P, S, N element in the steel grade needs to be strictly controlled. The content of P, S, N element is controlled as follows: p is less than or equal to 0.015 percent; s is less than or equal to 0.006 percent; n is less than or equal to 0.004 percent.
The invention provides low-cost hot forming steel for pipe making and a production and preparation method thereof, and the method comprises the following steps: smelting the molten steel and then continuously casting to form a continuous casting billet; hot rolling the continuous casting billet to form a hot rolled plate; the hot rolled plate is acid-rolled to form a cold-hard steel strip; and continuously annealing the cold-hard steel strip to obtain a finished product.
In order to better understand the technical solution, the above solution will be described in detail with reference to specific embodiments.
The embodiment of the invention provides low-cost hot forming steel for pipe making and a production and preparation method thereof, wherein the production and preparation method comprises the following steps:
(1) and after the molten steel is smelted, forming a continuous casting billet through a continuous casting process. The actual chemical composition is shown in table 1.
TABLE 1 chemical composition (wt%) of a low-cost hot-formed steel for pipe making
| Examples | C | Si | Mn | P | S | AL | Ti | N |
| 1 | 0.195 | 0.251 | 2.000 | 0.011 | 0.0050 | 0.036 | 0.015 | 0.003 |
| 2 | 0.190 | 0.200 | 1.605 | 0.009 | 0.0043 | 0.060 | 0.022 | 0.002 |
| 3 | 0.211 | 0.290 | 1.500 | 0.013 | 0.0051 | 0.055 | 0.030 | 0.004 |
| 4 | 0.280 | 0.276 | 1.977 | 0.011 | 0.0049 | 0.020 | 0.010 | 0.003 |
(2) And hot rolling the continuous casting billet to form a hot rolled plate, wherein the heating temperature of the continuous casting billet is 1200-1250 ℃, the hot rolling finishing temperature is 860-900 ℃, and the coiling temperature is 595-625 ℃. The hot rolled plate is subjected to acid rolling to form cold and hard strip steel, the acid rolling deformation is 50-80%, and the specific data are shown in Table 2.
The purpose of heating the continuous casting slab to 1200-1250 ℃ in the steps is to realize austenitization, eliminate casting defects, homogenize the structure, reduce deformation resistance and prevent abnormal growth of crystal grains caused by overhigh temperature. The purpose of setting the finishing temperature of hot rolling to 860 ℃ to 900 ℃ is to ensure that the hot rolled sheet is austenite + ferrite with a uniform structure and to prevent coarse grains due to an excessively high finishing temperature or a mixed grain structure due to an excessively low finishing temperature. The purpose of setting the curling temperature to be 595-625 ℃ is to improve deformation energy storage by controlling cold and thinning crystal grains, and is beneficial to obtaining fine and uniform tissues by subsequent recrystallization.
TABLE 2 Hot Rolling Process of Low cost Hot-formed Steel for pipe making and product thickness
(3) And (3) carrying out acid rolling on the hot rolled plate to form cold and hard strip steel, wherein the cold rolling reduction is set to be 50-80%, and the reduction setting comprehensively considers the rolling capacity of a rolling mill and the accumulation of deformation energy storage.
(4) And (3) annealing the acid-rolled strip steel to obtain a finished product, wherein the parameters of the annealing process are shown in a table 3. The dew point temperature is controlled between-35 ℃ and-25 ℃, the external oxidation of the strip steel is inhibited, and the surface quality is ensured. The temperature of the strip steel heating and heat preservation section is 770-790 ℃, and the full recrystallization is ensured. Cooling to 440-460 ℃ at a cooling speed of 17-20 ℃/s after heat preservation, and obtaining a structure of ferrite and pearlite. Then the strip steel is air-cooled to the temperature of less than 150 ℃, and then is naturally cooled to the room temperature. The finishing elongation is set to be 0.6-0.9 percent, and the purpose of controlling the shape and the surface roughness is achieved.
TABLE 3 annealing process parameters of low-cost hot-formed steel for pipe making
And (3) sampling a finished product, and testing the mechanical property, wherein the detection result and the internal control standard are shown in the table 4. The performance is detected by a conventional detection method, and the specific operation is not described in detail.
TABLE 4 mechanical properties and residual austenite content of a low-cost hot-formed steel for pipe making
When the hot forming steel for pipe production leaves a factory, all mechanical property indexes meet the internal control standard, and the hot forming steel has lower strength and higher elongation. The strength of other automobile factories or matched factories after hot forming process by using the hot formed steel as raw material can reach 1500MPa and above, the elongation after fracture (gauge length is 80mm) is higher than 5 percent, the strength requirement of the automobile hollow structural member is met, and the automobile can still meet the collision safety performance after being lightened.
FIG. 1 is a photograph showing a typical microstructure of a low-cost hot-formed steel sample for pipe production of example 3. The structure mainly comprises ferrite and martensite, the proportion of the martensite is higher than 95%, and the proportion of the ferrite is not higher than 5%.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the invention relates to low-cost hot-formed steel for pipe making, which comprises the following chemical components in percentage by weight: 0.19 to 0.28 percent of C; 0.20 to 0.29 percent of Si; 1.5 to 2.0 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.006 percent; 0.02 to 0.06 percent of Al; 0.01 to 0.03 percent of Ti; n is less than or equal to 0.004 percent, and the balance of Fe and inevitable impurities. The hot forming steel of the invention takes C-Si-Mn as a basic alloy system, and the addition of alloy elements is strictly controlled to ensure low cost. Through performance detection, the hot forming steel disclosed by the invention is low in tensile strength and yield strength, the elongation (gauge length is 80mm) is more than 26%, the forming is easy, the tensile strength can reach 1500MPa after the hot forming process, the elongation (gauge length is 80mm) is more than 5%, and the hot forming steel is very suitable for producing hollow structural members with high strength requirements through the hot forming process.
The above embodiments are described in detail for the purpose of illustrating the invention, and it should be understood that the invention is not limited to the above embodiments, but is intended to cover all modifications, equivalents, improvements, etc. within the spirit and principle of the invention.
Claims (7)
1. The low-cost hot formed steel for pipe making is characterized by comprising the following chemical components in percentage by weight:
0.19 to 0.28 percent of C; 0.20 to 0.29 percent of Si; 1.5 to 2.0 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.006 percent; 0.02 to 0.06 percent of Al; 0.01 to 0.03 percent of Ti; n is less than or equal to 0.004 percent, and the balance of Fe and inevitable impurities.
2. The production and preparation method of the low-cost hot forming steel for pipe making is characterized by comprising the following steps of:
smelting the molten steel and casting into a continuous casting billet;
hot rolling the continuous casting billet to obtain a hot rolled plate;
carrying out acid rolling on the hot rolled plate to obtain a cold-hard steel strip;
and annealing the cold-hard steel strip to obtain hot formed steel, and then finishing, inspecting a finished product, packaging and leaving a factory.
3. The production method of the low-cost hot-forming steel for pipe making according to claim 2, wherein the smelting and casting are performed as continuous casting slabs, specifically:
smelting the molten steel by a converter, and casting into a continuous casting blank by adopting a continuous casting mode.
4. The method for producing a low-cost hot-formed steel for pipe making according to claim 2, wherein the hot rolling process is performed at a hot rolling billet heating temperature of 1200 ℃ to 1250 ℃, a hot rolling finishing temperature of 860 ℃ to 900 ℃, and a coiling temperature of 595 ℃ to 625 ℃.
5. The method for producing a low-cost hot-formed steel for pipe making as set forth in claim 2, wherein in said acid rolling process, the deformation amount by acid rolling is 50% to 80%, and the flat elongation is 0.6% to 0.9%.
6. The method for producing a low-cost hot-formed steel for pipe making as set forth in claim 2, wherein the annealing process comprises: heating the cold-hardened steel strip to 770-790 ℃; cooling the cold-hard steel strip after heat preservation to 440-460 ℃ at a cooling rate of 17-20 ℃/s, and then air-cooling until the temperature of the steel strip is lower than 150 ℃.
7. The method for producing a low-cost hot-formed steel for pipe making as set forth in claim 2, wherein the finished hot-formed steel has a thickness of 0.5mm to 2.5 mm.
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| CN110004361A (en) * | 2019-04-01 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of production method improving cold rolling DP980 steel yield tensile ratio and reaming performance |
| CN110578093A (en) * | 2019-10-18 | 2019-12-17 | 山东钢铁集团日照有限公司 | Production method of cold-rolled DP700 steel for manufacturing automobile tubular parts |
| CN110607481A (en) * | 2019-10-18 | 2019-12-24 | 山东钢铁集团日照有限公司 | Production method of TRIP690+ Z steel with high yield strength grade |
| CN111041382A (en) * | 2019-12-03 | 2020-04-21 | 马鞍山钢铁股份有限公司 | 1800 MPa-grade non-coating hot forming steel with low high-temperature friction coefficient and preparation method thereof |
| CN111321281A (en) * | 2020-04-21 | 2020-06-23 | 山东钢铁集团日照有限公司 | Method for realizing I & QP steel reinforcement and plasticization through microstructure regulation |
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Application publication date: 20210326 |