CN115491589A - 800 MPa-grade CSP short-process hot-rolled high-strength structural steel and manufacturing method thereof - Google Patents
800 MPa-grade CSP short-process hot-rolled high-strength structural steel and manufacturing 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention discloses 800 MPa-grade CSP (cast steel plate) short-process hot-rolled high-strength structural steel and a preparation method thereof, wherein the structural steel comprises the following chemical components in percentage by weight: 0.045 to 0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7%, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20%, cr:0.15 to 0.50%, als:0.06 to 0.20 percent of Fe, less than or equal to 0.012 percent of As, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. The thin steel plate strip with the yield strength of more than or equal to 800MPa produced by the invention has the advantages of low process cost and alloy cost, tensile strength of more than or equal to 850MPa, elongation of more than or equal to 18 percent, higher extension plasticity, and extremely high product strength-plasticity product, and can meet various application requirements and application environments of users such as rolling, bending and other various forming processes, welding and the like.
Description
Technical Field
The invention relates to the field of microalloyed steel manufacturing, in particular to 800 MPa-grade CSP short-process hot-rolled high-strength structural steel and a manufacturing method thereof.
Background
How to realize the lightweight structure by improving the strength of the steel plate so as to achieve the effects of reducing consumption and energy, reducing the labor intensity of workers and the like becomes the necessity of the development of modern steel materials. In general structural steels, the level of plasticity tends to decrease as the strength of the material increases. The plasticity represents the deformation capability of the material, and the excessively low plasticity directly influences the forming of the structure of the user part, so that the problems of cracking and the like are easily caused, and the material is unusable. How to solve the problem of the pair of spears with strength and plasticity also becomes a difficult point for the research and development of steel material varieties.
High-strength steel with yield strength of 800MPa grade is researched and manufactured in domestic and foreign institutions and enterprises. The weather-resistant hot-rolled steel plate with excellent high strength and the manufacturing method thereof are published abroad by Korea POSCO company (patent number: CN 101568659A), the manufacturing method of the steel sheet with high tensile strength and extensibility disclosed by Ansailetall France company and the sheet obtained by the manufacturing method thereof (patent number: CN 101784688A), the hot-rolled steel strip with yield strength higher than 800MPa developed at home such as northeast university and the manufacturing method thereof (patent number: CN 101629560A), the high-strength steel with yield strength of 800MPa grade developed by Baoshan iron and Steel works Limited company and the manufacturing method thereof (patent number: CN 104513937A), the yield strength can reach the 800MPa grade, but the extensibility can only be ensured to be more than or equal to 12 percent, and the diversity requirements of users can not be completely met. How to develop a low-alloy high-strength steel material which has high strength and high plasticity and simultaneously has economical efficiency and practicability has great difficulty.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide 800MPa CSP short-process hot-rolled high-strength structural steel and a manufacturing method thereof, wherein low-cost alloy and process design are adopted for production, so that on one hand, high strength (yield strength is more than or equal to 800MPa and tensile strength is more than or equal to 850 MPa) is ensured, and more importantly, high plasticity (elongation after fracture is more than or equal to 18%) is realized.
The technical scheme of the invention is as follows: the 800MPa CSP short-process hot-rolled high-strength structural steel is characterized by comprising the following chemical components in percentage by weight,
c:0.045 to 0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7%, P: less than or equal to 0.012%, S: less than or equal to 0.003 percent, ti:0.12 to 0.20%, cr:0.15 to 0.50%, als:0.06 to 0.20 percent of the total weight of the alloy, less than or equal to 0.012 percent of As, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities.
Preferably, the chemical components comprise the following chemical components in percentage by weight,
c:0.058 to 0.060%, si: less than or equal to 0.12 percent, mn: 1.63-1.68%, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti: 0.160-0.165%, cr:0.39 to 0.44%, als: 0.082-0.105%, less than or equal to 0.0042% of As, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities.
Preferably, the 800 MPa-grade CSP short-process hot-rolled high-strength structural steel has the thickness of 1.2-4.5 mm, the yield strength of more than or equal to 800MPa, the tensile strength of more than or equal to 850MPa and the elongation of more than or equal to 18%.
The invention also provides a preparation method of the 800MPa CSP short-process hot-rolled high-strength structural steel, which is characterized by comprising the following steps of:
1) Smelting in a converter, then refining in an LF (ladle furnace), and controlling the chemical components and the weight percentage of molten steel as C:0.045 to 0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7%, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20%, cr:0.15 to 0.50%, als:0.06 to 0.20 percent of Fe, less than or equal to 0.012 percent of As, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities;
2) Then, the molten steel is subjected to thin slab continuous casting and rolling production: the thickness of the cast billet is 60-85 mm; heating the casting blank in a soaking furnace, wherein the heating temperature is controlled to be 1210-1250 ℃; rolling in a 7-stand finishing mill, wherein the starting temperature of finish rolling is more than or equal to 1100 ℃, the reduction rate of the first three passes is more than or equal to 50%, the pass temperature is more than or equal to 1050 ℃, the reduction rate of the F4 pass is more than or equal to 40%, the reduction rate of the F5 pass is more than or equal to 35%, constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 3.0-12.0 m/s, the final rolling temperature is controlled to be 870-920 ℃, and the rolling thickness is 1.2-4.5 mm;
3) Laminar cooling: the water cooling speed is 70-120 ℃/s, the temperature is reduced to 650-700 ℃, and then the temperature is reduced to 600-640 ℃ according to the water cooling speed of less than or equal to 10 ℃/s for coiling.
Preferably, in the step 1), the chemical components of the molten steel and the weight percentage of C:0.058 to 0.060%, si: less than or equal to 0.12 percent, mn: 1.63-1.68%, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti: 0.160-0.165%, cr:0.39 to 0.44%, als: 0.082-0.105%, as is less than or equal to 0.0042%, N is less than or equal to 0.005%, and the rest is Fe and inevitable impurities.
Preferably, in the step 2), the cast slab is heated in a soaking furnace, and the heating temperature is controlled to be 1230 to 1240 ℃.
Preferably, in the step 2), constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 6.2-8.1 m/s, and the finishing temperature is controlled to be 890-910 ℃.
Preferably, in the step 3), the temperature is cooled to 660-680 ℃, and then the steel is cooled to 610-630 ℃ at the water cooling speed of less than or equal to 10 ℃/s for coiling.
The chemical components of the present invention are explained below:
carbon C: carbon is the most economical strengthening element. However, if the carbon content is greater than 0.07%, good formability of the material cannot be satisfied, and at the same time, peritectic reaction of molten steel occurs during casting, increasing the risk of continuous casting breakout, and the weldability of steel is affected by too high carbon content. Therefore, the carbon content is limited to the range of 0.045 to 0.069%.
Silicon Si: silicon purifies ferrite and prevents the formation of coarse carbides during cooling, but silicon also readily forms Fe 2 SiO 4 And a eutectoid product is formed on the surface of the steel billet and FeO and is solidified into an anchor structure, so that the FeO is difficult to remove, and the final surface quality is influenced. Therefore, the silicon content is limited to the range of 0.20% or less.
Manganese Mn: manganese is the most effective element for improving the strength and toughness, and can effectively delay pearlite transformation. If the content is less than 1.30%, the strength requirement of the material cannot be met; however, since the addition of excessive manganese also easily causes peritectic reaction of molten steel and causes quality problems such as continuous casting cracks, the manganese content is limited to a range of 1.30 to 1.70%.
Chromium Cr: chromium is a carbide forming element, has strong affinity with carbon, can block the diffusion of carbon atoms, and has the combined action of manganese, so that the transformation of pearlite and bainite is remarkably delayed. In the invention, the chromium content is controlled to be 0.15-0.50%.
Titanium Ti: the precipitation strengthening effect of titanium is outstanding, the titanium precipitation strengthening effect is an economic and effective element for ensuring the strength of steel, and the titanium content range of the invention is designed to be 0.12-0.20%.
Phosphorus P: phosphorus is prone to center segregation, which affects formability. In the invention, the phosphorus content is controlled to be less than or equal to 0.012 percent.
Aluminum Als: as an effective deoxidizer in the smelting process, simultaneously has a certain grain refining effect, improves the strength of steel, but is easy to form Al 2 O 3 And (4) inclusion. In the invention, the content of acid-soluble aluminum is controlled to be 0.06-0.20%.
Arsenic As: the toughness and plasticity of the material can be greatly reduced, and the arsenic content is strictly controlled to be less than or equal to 0.012 percent.
Sulfur S, nitrogen N: the sulfur and nitrogen are easily combined with Ti in steel, the strengthening effect of the Ti is influenced, and the plasticity of steel is greatly influenced, wherein the sulfur is controlled to be less than or equal to 0.003 percent, and the nitrogen is controlled to be less than or equal to 0.005 percent.
In the present invention, noble alloying elements such as Nb, cu, ni, mo, and the like are not added from the viewpoint of improving the formability of the material and the economy, except for limiting the ranges of the above chemical components.
The control of the main process is explained below.
The CSP production line is characterized in that a continuous casting billet directly enters a heating furnace for heating after being cast and cut, is rolled by a 7-pass rolling mill after being discharged from the furnace for dephosphorization, and is coiled after being cooled by laminar flow; compared with the conventional process, the time and energy consumption of the whole production process are greatly reduced, and the method has the characteristic of environmental protection.
And selecting a blank thickness of 62-85 mm according to different finished product thicknesses by combining the load condition of a production line rolling mill for rolling.
The casting blank is heated and insulated at 1210-1250 ℃, and the temperature can make more alloy elements dissolved into austenite, and the alloy elements separated out at the subsequent low-temperature stage achieve a larger strengthening effect.
The finishing rolling temperature is controlled to be 870-920 ℃, and the austenite can obtain larger deformation storage energy through deformation in the temperature range, so that dynamic conditions and nucleation points are provided for subsequent ferrite phase transition and precipitation.
The intermediate temperature is controlled between 650 ℃ and 700 ℃, and the austenite supercooling degree is increased by rapidly cooling to the temperature range after rolling, so that the ferrite transformation is facilitated, and a foundation is provided for subsequent interphase precipitation and dispersion precipitation.
The coiling temperature is controlled between 600 ℃ and 640 ℃, and the temperature interval can separate out the nanometer precipitated phase to the maximum extent so as to achieve the precipitation strengthening effect.
The rolling speed is controlled to be 3.0-12.0 m/s for constant-speed rolling according to the thickness of a finished product, so that the stability of the coil feeding process is ensured, and the stability of the overall performance is ensured.
The invention has the beneficial effects that:
compared with the prior art, the process cost and the alloy cost of the produced thin steel plate strip with the yield strength of more than or equal to 800MPa are low, the tensile strength is more than or equal to 850MPa, the elongation is more than or equal to 18%, the product has higher extension plasticity, the product has extremely high product of strength and elongation (up to 18.9 GPa%), the product can be applied to the field of high-strength structural members with higher forming requirements, and various forming processes such as rolling and bending, various application requirements such as welding and the like and application environments can be met.
Drawings
FIG. 1 is a metallographic structure diagram of 800MPa CSP short-process hot-rolled high-strength structural steel of the present invention.
Detailed Description
The following specific examples further illustrate the invention in detail. Table 1 is a list of chemical compositions for each example of the invention; table 2 is a table of the main process parameters of each embodiment of the present invention; the embodiments of the invention are produced according to the following steps:
1) Smelting in a converter, then refining in an LF furnace, and controlling the chemical components and weight percentage of molten steel as C:0.045 to 0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7%, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20%, cr:0.15 to 0.50%, als:0.06 to 0.20 percent of Fe, less than or equal to 0.012 percent of As, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities;
2) And then, carrying out thin slab continuous casting and rolling production on the molten steel: the thickness of the cast billet is 60-85 mm; heating the casting blank in a soaking furnace, wherein the heating temperature is controlled to be 1210-1250 ℃; rolling in a 7-stand finishing mill, wherein the starting temperature of finish rolling is more than or equal to 1100 ℃, the reduction rate of the first three passes is more than or equal to 50%, the pass temperature is more than or equal to 1050 ℃, the reduction rate of the F4 pass is more than or equal to 40%, the reduction rate of the F5 pass is more than or equal to 35%, constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 3.0-12.0 m/s, the final rolling temperature is controlled to be 870-920 ℃, and the rolling thickness is 1.2-4.5 mm;
3) Laminar cooling: the water cooling speed is 70-120 ℃/s, the steel is cooled to the intermediate cooling temperature of 650-700 ℃, and then the steel is cooled to 600-640 ℃ according to the water cooling speed of less than or equal to 10 ℃/s for coiling.
The chemical composition of examples 1-5 is shown in Table 1 below, the main process parameters of examples 1-5 are shown in Table 2 below, and the mechanical property test results of the products obtained in examples 1-5 are shown in Table 3 below.
TABLE 1 list of chemical compositions of various examples of the invention
TABLE 2 List of the major process parameters for various embodiments of the invention
TABLE 3 mechanical Property test results List of the various embodiments of the present invention
As can be seen from Table 3, the finished products obtained in examples 1 to 5 satisfy the yield strength of more than or equal to 800MPa, the tensile strength of more than or equal to 850MPa, the elongation of more than or equal to 18 percent, and the maximum product of strength and elongation of 18.90 GPa. The metallographic structure of the product is shown in figure 1, the structure type is ferrite or ferrite plus a small amount of bainite, and the structure type has good plasticity, so that the product can meet the requirement of the subsequent processing process.
Claims (8)
1. The 800MPa CSP short-process hot-rolled high-strength structural steel is characterized by comprising the following chemical components in percentage by weight,
c:0.045 to 0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7%, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20%, cr:0.15 to 0.50%, als:0.06 to 0.20 percent of the total weight of the alloy, less than or equal to 0.012 percent of As, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities.
2. The 800MPa CSP short run hot rolled high strength structural steel according to claim 1 comprising the following chemical components, in weight percent,
c:0.058 to 0.060%, si: less than or equal to 0.12 percent, mn: 1.63-1.68%, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti:0.160 to 0.165%, cr:0.39 to 0.44%, als: 0.082-0.105%, less than or equal to 0.0042% of As, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities.
3. The 800MPa CSP short-process hot-rolled high-strength structural steel as claimed in claim 1, wherein the thickness of the 800MPa CSP short-process hot-rolled high-strength structural steel is 1.2-4.5 mm, the yield strength is not less than 800MPa, the tensile strength is not less than 850MPa, and the elongation is not less than 18%.
4. The preparation method of the 800 MPa-grade CSP short-process hot-rolled high-strength structural steel is characterized by comprising the following steps of:
1) Smelting in a converter, then refining in an LF (ladle furnace), and controlling the chemical components and the weight percentage of molten steel as C:0.045 to 0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7%, P: less than or equal to 0.012%, S: less than or equal to 0.003 percent, ti:0.12 to 0.20%, cr:0.15 to 0.50%, als:0.06 to 0.20 percent of Fe, less than or equal to 0.012 percent of As, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities;
2) And then, carrying out thin slab continuous casting and rolling production on the molten steel: the thickness of the cast billet is 60-85 mm; heating the casting blank in a soaking furnace, wherein the heating temperature is controlled to be 1210-1250 ℃; rolling in a 7-stand finishing mill, wherein the starting temperature of finish rolling is more than or equal to 1100 ℃, the reduction rate of the first three passes is more than or equal to 50%, the pass temperature is more than or equal to 1050 ℃, the reduction rate of the F4 pass is more than or equal to 40%, the reduction rate of the F5 pass is more than or equal to 35%, constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 3.0-12.0 m/s, the final rolling temperature is controlled to be 870-920 ℃, and the rolling thickness is 1.2-4.5 mm;
3) Laminar cooling: the water cooling speed is 70-120 ℃/s, the temperature is reduced to 650-700 ℃, and then the temperature is reduced to 600-640 ℃ according to the water cooling speed of less than or equal to 10 ℃/s for coiling.
5. The method for preparing 800MPa grade CSP short-process hot-rolled high-strength structural steel according to claim 4, wherein in the step 1), the chemical components of the molten steel and the weight percentage of C:0.058 to 0.060%, si: less than or equal to 0.12 percent, mn: 1.63-1.68%, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti:0.160 to 0.165%, cr:0.39 to 0.44%, als: 0.082-0.105%, less than or equal to 0.0042% of As, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities.
6. The method for preparing the 800MPa CSP short-process hot-rolled high-strength structural steel according to claim 4, wherein in the step 2), the casting blank is heated in a soaking furnace, and the heating temperature is controlled to be 1230-1240 ℃.
7. The method for preparing the 800MPa CSP short-process hot-rolled high-strength structural steel according to claim 4, wherein in the step 2), constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 6.2-8.1 m/s, and the finish rolling temperature is controlled to be 890-910 ℃.
8. The method for preparing the 800MPa CSP short-process hot-rolled high-strength structural steel as claimed in claim 4, wherein in the step 3), the steel is cooled to 660-680 ℃ and then is cooled to 610-630 ℃ at a water cooling speed of less than or equal to 10 ℃/s for coiling.
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