CN110284068B - Preparation method of deep-drawing hot-rolled steel plate - Google Patents
Preparation method of deep-drawing hot-rolled steel plate Download PDFInfo
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- CN110284068B CN110284068B CN201910691158.0A CN201910691158A CN110284068B CN 110284068 B CN110284068 B CN 110284068B CN 201910691158 A CN201910691158 A CN 201910691158A CN 110284068 B CN110284068 B CN 110284068B
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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
- C22C38/001—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
- C22C38/002—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to the field of steel rolling, in particular to a preparation method of a deep drawing hot rolled steel plate. The preparation method of the deep drawing hot rolling steel plate comprises the following steps: (1) the casting blank obtained after continuous casting of molten steel comprises 0.01-0.04% of C, less than or equal to 0.10% of Si, 0.10-0.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, 0.04-0.08% of Ti, less than or equal to 0.004% of N, 0.015-0.065% of Als, and the balance of Fe and inevitable impurities; (2) heating a casting blank; (3) rough rolling and finish rolling: rough rolling finishing temperature: 1080-1120 ℃; finish rolling temperature T of finish rollingFinish rolling：TFinish rolling≥892‑240.3×[％C]DEG C; (4) the laminar cooling adopts front-section cooling; when the C is more than or equal to 0.01 percent and less than or equal to 0.021 percent, the laminar cooling final cooling temperature TFinal cooling，≤892‑8486.2×[％C]When the temperature is more than 0.021 percent and less than or equal to 0.04 percent, the temperature is TFinal coolingLess than or equal to 707 ℃; (5) and (4) coiling. The deep drawing depth of the obtained deep drawing hot rolled steel sheet is 100mm or more.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to a preparation method of a deep drawing hot rolled steel plate.
Background
At present, domestic deep drawing products mainly adopt a cold rolling process, such as IF steel disclosed by the grant publication No. CN 106636914B and a preparation method thereof, a production method of a low-earing-rate ultra-deep drawing cold-rolled annealed low-carbon steel strip disclosed by the application publication No. CN 109207696A, a high-strength steel plate with excellent deep drawing property disclosed by the grant publication No. CN 102517493B and a manufacturing method thereof, and high-r-value thick-specification IF automobile steel disclosed by the grant publication No. CN 104120337B and a production method thereof. The cold rolling process can be used for preparing steel products with good deep drawing performance, but has the defects of long production period, low yield and high process cost, and the material selection range of the manufacturing industry is influenced to a great extent.
With the continuous promotion of energy conservation, emission reduction, cost reduction and efficiency improvement and the continuous improvement of the quality of hot rolled steel plate products in China, the hot rolled steel plate with low price is adopted to replace a cold rolled steel plate in more and more industries, and in some manufacturing fields requiring deep drawing performance, such as manufacturing of air conditioner compressor shells and other industries, the hot rolled products are often cracked, processed into lugs and the like due to the fact that the deep drawing depth reaches 100mm, and the yield and the production efficiency of enterprises are seriously reduced.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for manufacturing a deep drawn hot rolled steel sheet having a deep drawing depth of 100mm or more.
In order to achieve the above object, the present invention provides a method for manufacturing a deep drawn hot rolled steel sheet, comprising the steps of:
(1) the casting blank is obtained by continuously casting molten steel, wherein the molten steel comprises the following chemical components, by weight, 0.01-0.04% of C, less than or equal to 0.10% of Si, 0.10-0.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, 0.04-0.08% of Ti, less than or equal to 0.004% of N, 0.015-0.065% of Als, and the balance of Fe and inevitable impurities;
(2) heating a casting blank;
(3) rough rolling and finish rolling;
rough rolling finishing temperature: 1080-1120 ℃;
after rough rolling, heating the edge of the strip or coiling the strip by a hot coil box;
finish rolling temperature T of finish rollingFinish rolling：TFinish rolling≥892-240.3×[％C]℃；
(4) Laminar cooling: adopting front-stage cooling; when the C is more than or equal to 0.01 percent and less than or equal to 0.021 percent, the laminar cooling final cooling temperature TFinal cooling≤892-8486.2×[％C]When the temperature is more than 0.021 percent and less than or equal to 0.04 percent, the temperature is TFinal cooling≤707℃。
(5) Coiling: and coiling after final cooling to obtain the deep drawing hot rolling steel plate.
Compared with the prior art, the invention firstly improves the chemical components of the molten steel, and the components are specifically explained as follows:
c and N: the r value is seriously damaged by the solid-dissolved C and N, and the deep drawing performance is influenced because the components of the recrystallized texture {111} are sharply reduced along with the increase of the solid-dissolved C and N, but the mechanical property of the steel plate can be improved by a proper amount of C, so that the C is 0.01-0.04%, and the N is less than or equal to 0.004%.
Si: si has adverse effect on the red iron sheet on the surface of the steel plate, and the invention adopts low Si design to improve the surface quality of the hot rolled steel plate.
Mn: according to the invention, the manganese is adopted in an amount of 0.10-0.30% by mass, so that the ferrite grains are refined, and the effect of delaying pearlite transformation is good.
P and S: phosphorus and sulfur as harmful impurities in steel have great damaging effects on the cold deep drawing performance, low-temperature toughness and weldability of the steel; the invention controls the phosphorus content below 0.015 percent and the sulfur content below 0.006 percent from the aspects of reducing the production cost and improving the product quality, so that the influence of the phosphorus and the sulfur on the deep drawing performance is reduced to the lowest level.
Ti: the mass percentage of titanium adopted by the invention is 0.04-0.08%, C, N, S in steel is fully dissolved in solid solution, and the deep drawing performance of the steel plate is improved.
And Als: the mass percentage of the acid-soluble aluminum adopted by the invention is 0.01-0.06%, and the excessive high content of O is prevented.
Secondly, rough rolling temperature of 1080-1120 ℃ is adopted, heating or rolling of the edge of the strip is adopted after rough rolling, so that temperature drop of the edge of the steel plate is reduced, the performance uniformity of a finished product is ensured, the temperature drop of the edge of the steel plate is an inevitable link, the temperature drop of the edge of the steel plate can be reduced from 60 ℃ to 20 ℃, the coarse grain area of the edge of the finished product is reduced from 80mm to 10mm, and the deep drawing performance of the edge of the strip steel is obviously improved.
In addition, the invention adopts the finish rolling temperature T of finish rollingFinish rolling≥892-240.3×[％C]DEG C; the aim is to ensure that the strip steel rapidly passes through a two-phase region and enters a ferrite region after final cooling, thereby eliminating the generation of mixed crystals, wherein the mixed crystals are important factors influencing the deep drawing performance of a hot rolled plate.
Finally, the invention adopts front-stage cooling, and when C is more than or equal to 0.01% and less than or equal to 0.021%, the laminar cooling final cooling temperature TFinal cooling≤892-8486.2×[％C]When the temperature is more than 0.021 percent and less than or equal to 0.04 percent, the temperature is TFinal coolingLess than or equal to 707 ℃. In order to ensure that the strip steel quickly passes through the two-phase region, the precise final cooling temperature is adopted, and the strip steel can enter a ferrite region, so that the generation of mixed crystals is eliminated.
Preferably, in the step (2), the heating temperature is 1250-1300 ℃. When the steel plate is heated at 1250-1300 ℃, the temperature of the steel plate in the steel rolling process can be ensured to meet the requirements of all links. Too high heating temperature not only affects the production cost, but also increases the burning loss, causing surface defects of the steel sheet.
Preferably, the coiling temperature is 40 ℃ to 60 ℃ lower than the final cooling temperature.
Preferably, the metallographic structure of the deep drawn hot rolled steel sheet is a single equiaxed ferrite structure.
Preferably, the deep drawing depth of the deep drawing hot rolled steel plate is more than or equal to 100 mm.
Preferably, the yield strength R of the deep-drawn hot-rolled steel sheeteL200 to 250MPa, tensile strength Rm290-350 MPa, and the elongation A is more than or equal to 40 percent; n is more than or equal to 0.19; r is more than or equal to 1.00 and delta r is less than or equal to 0.1.
Drawings
FIG. 1 is a metallographic structure diagram of a deep-drawn hot-rolled steel sheet obtained in example 1;
FIG. 2 is a structural view of a metallographic structure of a steel sheet obtained in comparative example 1.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
Examples 1 to 9
The deep-drawn hot-rolled steel sheet in the following examples was manufactured as follows:
(1) the casting blank is obtained by continuously casting molten steel, wherein the molten steel comprises the following chemical components, by weight, 0.01-0.04% of C, less than or equal to 0.10% of Si, 0.10-0.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, 0.04-0.08% of Ti, less than or equal to 0.004% of N, 0.015-0.065% of Als, and the balance of Fe and inevitable impurities;
(2) heating of
The heating temperature is 1250-1300 ℃;
(3) rough rolling and finish rolling
Rough rolling finishing temperature: 1080-1120 ℃;
after rough rolling, coiling by adopting a heat-preserving cover or a hot coil box with edge heating;
finish rolling temperature T of finish rollingFinish rolling：TFinish rolling≥892-240.3×[％C]℃；
(4) Laminar cooling
The laminar cooling adopts front-section cooling;
laminar cooling final cooling temperature:
Tfinal cooling≤892-8486.2×[％C]℃ 0.01％≤C≤0.021％
TFinal cooling≤707℃ 0.021％＜C≤0.04％
(5) Coiling
Coiling is carried out after final cooling, and the coiling temperature is 40-60 ℃ lower than the final cooling temperature.
The chemical compositions and weight percentages of the refined molten steel in examples 1-9 and comparative examples 1-2 are shown in table 1:
TABLE 1
The parameters of the preparation processes of examples 1 to 9 and comparative examples 1 to 2 are shown in Table 2:
TABLE 2
The mechanical properties of the deep-drawn hot-rolled steel sheets obtained in examples 1 to 9 and comparative examples 1 to 2 are shown in Table 3:
TABLE 3
As can be seen from Table 3, the hot rolled steel sheet obtained in this embodiment has strength equivalent to that of the comparative example, elongation slightly higher, n value equivalent to that of the comparative example, and r value approximately doubled, so that it has good deep drawing properties, and the deep drawing depth is greater than or equal to 100mm, and is more than doubled as compared with the comparative example.
FIG. 1 is a structural view showing a metallographic structure of a hot rolled steel sheet obtained in example 1; FIG. 2 is a structural view of a metallographic structure of a hot-rolled steel sheet in comparative example 1. As can be seen from fig. 1, the product produced by the present embodiment has a single structure of equiaxed ferrite, and the size of the plate structure is not different from that of the core structure; as is clear from FIG. 2, the ferrite structure of the product produced in the comparative example was significantly coarser than that of the core structure. The uneven structure is a main cause of the lower r value, which results in insufficient deep drawing capability.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (1)
1. A preparation method of a deep drawing hot rolling steel plate is characterized by comprising the following steps:
(1) the casting blank is obtained by continuously casting molten steel, wherein the molten steel comprises the following chemical components, by weight, 0.01-0.04% of C, less than or equal to 0.10% of Si, 0.10-0.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, 0.04-0.08% of Ti, less than or equal to 0.004% of N, 0.015-0.065% of Als, and the balance of Fe and inevitable impurities;
(2) heating; heating a casting blank;
(3) rough rolling and finish rolling
Rough rolling finishing temperature: 1080-1120 ℃;
after rough rolling, heating the edge of the strip or coiling the strip by a hot coil box;
finish rolling temperature T of finish rollingFinish rolling：TFinish rolling≥892-240.3×[％C]℃；
(4) Laminar cooling
The laminar cooling adopts front-section cooling; when the C is more than or equal to 0.01 percent and less than or equal to 0.021 percent, the laminar cooling final cooling temperature TFinal cooling≤892-8486.2×[％C]DEG C; when C is more than 0.021% and less than or equal to 0.04%, TFinal cooling≤707℃；
(5) Coiling
Coiling after final cooling to obtain a deep drawing hot rolled steel plate;
in the step (2), the heating temperature is 1250-1300 ℃;
in the step (5), the coiling temperature is 40-60 ℃ lower than the final cooling temperature;
the metallographic structure of the deep drawing hot-rolled steel plate is a single equiaxed ferrite structure;
the deep drawing depth of the deep drawing hot rolled steel plate is more than or equal to 100 mm;
yield strength R of the deep drawing hot rolling steel plateeL200 to 250MPa, tensile strength Rm290-350 MPa, and the elongation A is more than or equal to 40 percent; n is more than or equal to 0.19; r is more than or equal to 1.00 and delta r is less than or equal to 0.1.
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| JP3872536B2 (en) * | 1996-02-23 | 2007-01-24 | 新日本製鐵株式会社 | Manufacturing method of hot-rolled steel sheet with excellent deep drawability using hot-rolling continuous process |
| CN100447280C (en) * | 2005-10-10 | 2008-12-31 | 燕山大学 | Impact stage low carbon steel hot-rolled sheet and mfg. method thereof |
| CN102719754A (en) * | 2012-05-31 | 2012-10-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled deep-punched pickled plate for automobile structures and production method thereof |
| CN106148803B (en) * | 2016-08-30 | 2017-11-24 | 唐山钢铁集团有限责任公司 | A kind of production method of deep-draw battery case steel |
| CN106498284A (en) * | 2016-11-08 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of ultra-deep punching with hot continuous rolling pickling steel band |
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