CN117089770A - Short-flow high-hardness super-resistant Hou Rega strip steel and production method thereof - Google Patents

Short-flow high-hardness super-resistant Hou Rega strip steel and production method thereof Download PDF

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CN117089770A
CN117089770A CN202311243791.6A CN202311243791A CN117089770A CN 117089770 A CN117089770 A CN 117089770A CN 202311243791 A CN202311243791 A CN 202311243791A CN 117089770 A CN117089770 A CN 117089770A
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strip steel
hardness
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刘昌明
柏明卓
刘永前
刘义滔
蔡珍
孙宜强
刘洋
胡俊
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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Abstract

The invention discloses a short-process high-hardness super-resistant Hou Rega strip steel, which comprises the following chemical components in percentage by weight: 0.16 to 0.50 percent of C, 0.10 to 0.50 percent of Si, 0.20 to 1.00 percent of Mn, 1.50 to 4.50 percent of Cr, 0.10 to 0.60 percent of Cu, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.30 percent of Al, 0.08 to 0.25 percent of Ti, less than or equal to 0.008 percent of N, and the balance of Fe and unavoidable impurity elements. The main process route is that the slab with the components obtained by smelting continuous casting is directly finish rolled after being quickly heated by a soaking pit, and the rolled strip steel is coiled after being cooled by two sections to obtain the hot rolled strip steel. The high-hardness super-resistant Hou Rega strip steel has high strength, high hardness, high forming performance and super-atmospheric corrosion resistance, can meet the processing requirements of bare coating-free surfaces of structural members such as photovoltaic brackets and the like, light-weight design requirements, rolling forming requirements and the like, and meets the super-atmospheric corrosion resistance requirements of service for more than 25 years, wherein the corrosion depth in the service period is less than or equal to 0.1mm; moreover, the high hardness can reduce the abrasion of sand, foreign matters and the like on the surface of the material, and the service life of the material in the use process is prolonged.

Description

Short-flow high-hardness super-resistant Hou Rega strip steel and production method thereof
Technical Field
The invention belongs to the technical field of low alloy steel production, and particularly relates to a high-hardness super-resistant Hou Rega strip steel and a short-process production method thereof.
Background
The atmospheric corrosion resistant steel, namely the weathering resistant steel, is widely applied to the production of outdoor steel structures with atmospheric corrosion resistant requirements such as containers, railway vehicles, bridges and the like, and the production and the application of the steel have been in the past decades. In recent years, with the improvement of the requirements on green, low carbon and environmental protection, the application scene of the atmospheric corrosion resistant steel is also expanding. The weather resistance of the atmospheric corrosion resistant steel is utilized to replace some steel surface corrosion prevention processes, such as pre-galvanization or zinc-aluminum-magnesium, post-galvanization and the like, so that the bare use of the material is realized, the problems of energy consumption and pollution brought by the plating process are reduced, and the maintenance cost of post-corrosion prevention maintenance and renovation is also reduced.
Short-flow manufacturing is attracting attention due to its simple, efficient, energy-saving manufacturing process, high dimensional accuracy, and high performance uniformity. Depending on the line layout, CSP, ESP, MCCR is formed in various forms, but is essentially continuous casting and rolling.
The present method for manufacturing high-strength weathering steel by using short-process production lines also relates to some invention patents, and the product is mainly applied to the aspects of containers, railway vehicles, derrick structures and the like, and the service cycle of the product is less than or equal to 10 years. For special corrosion resistance requirements that photovoltaic brackets, city lamp posts and the like need to be in service for 25 years in a maintenance-free environment and the corrosion depth of the photovoltaic brackets, city lamp posts and the like is less than or equal to 0.1mm in a C1-C3 environment for 25 years, the existing patent products cannot be met. The method comprises the following steps:
CN201811122091.0 discloses a thin weathering steel with tensile strength not less than 800MPa produced by short process and method, the composition design of which comprises the following components: 0.35 to 0.50 percent, cu:0.05 to 0.30 percent, the corrosion resistant alloy content is low, and only the general weather resistance level can be achieved; c:0.04 to 0.09 percent, mn:1.45 to 1.75 percent, the components are extremely easy to enter a peritectic zone, so that the quality of a plate blank is abnormal and even a steel leakage accident occurs due to peritectic reaction in the high-pulling-speed continuous casting process;
CN201811122365.6 discloses a thin weathering steel with yield strength greater than or equal to 550MPa produced by short process and method, the technical scheme is mainly: c:0.030 to 0.065 percent, si:0.10 to 0.30 percent, mn:0.7 to 1.3 percent, cu:0.10 to 0.40 percent, cr:0.20 to 0.55 percent, ni:0.15 to 0.40 percent of Ti: 0.06-0.10%, nb: 0.02-0.06%, als:0.01 to 0.06 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.008 percent, and N is less than or equal to 0.008 percent. The technical defects are that the Cu and Cr contents are low, the general weather-resistant steel can only meet the requirements, and the alloy contains Ni: 0.15-0.40%, and the manufacturing cost is high.
CN201610766086.8 discloses a method for producing weathering steel based on ESP sheet bar continuous casting and rolling process. The raw materials of the patent comprise, by mass, 0.01-0.06% of C, 0.30-0.60% of Si, 0.30-0.60% of Mn, 0.05-0.12% of P, 0.25-0.45% of Cu, 0.30-0.80% of Cr, less than or equal to 0.30% of Ni and less than or equal to 0.01% of S, casting is carried out at a pulling rate of not less than 4.5m/min, and the temperature of a finish rolling outlet is not less than 820 ℃; and cooling the hot rolled strip steel to 500-600 ℃ through laminar flow, and then entering a coiling machine for coiling and warehousing. The patent is still oriented to the application requirements of common weathering steel, and the Cu and Cr contents are intentionally controlled. And no any bit alloy element is added, the Mn content is only 0.30-0.60%, and the overall strength level is lower.
As can be seen from comparison with existing patents, current weathering steels are mainly aimed at railway vehicles, containers, bridges and other uses, and some patents consider high strength designs, but their weathering requirements and designs remain at a general level of weathering performance. And the problem of abrasion of the bare material during use is not considered.
Disclosure of Invention
The invention aims to provide the high-hardness super-resistant Hou Rega strip steel manufactured by a short-flow process, which has the corrosion rate smaller than or equal to 30 percent, the yield strength larger than or equal to 800MPa, the tensile strength larger than or equal to 900MPa, the breaking elongation larger than or equal to 12 percent, the hardness HV10 larger than or equal to 300, and has the high strength, the high hardness, the high forming performance and the super-atmospheric corrosion resistance.
The technical scheme adopted by the invention for realizing the purpose of the invention is as follows:
a high-hardness super-resistant Hou Rega strip steel comprises the following chemical components in percentage by weight: 0.16 to 0.50 percent of C, 0.10 to 0.50 percent of Si, 0.20 to 1.00 percent of Mn, 1.50 to 4.50 percent of Cr, 0.10 to 0.60 percent of Cu, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.30 percent of Al, 0.08 to 0.25 percent of Ti, less than or equal to 0.008 percent of N, and the balance of Fe and unavoidable impurity elements.
Preferably, the weight percentage of Al is less than or equal to 0.10 percent.
Preferably, in order to reduce the effect of copper embrittlement, the present invention requires Si+2Ni.gtoreq.0.10%.
Preferably, in order to improve the strength, nb is less than or equal to 0.06%, V is less than or equal to 0.15%, mo is less than or equal to 0.40%, B is less than or equal to 0.002% and the like can be added; in order to improve the corrosion resistance, ni is less than or equal to 0.40 percent, sb is less than or equal to 0.15 percent, re is less than or equal to 0.15 percent, ca is less than or equal to 0.015 percent, mg is less than or equal to 0.015 percent and the like can be added; the addition of these elements may improve or not affect the main object of the steel of the present invention, without departing from the scope of the present invention, and should be within the scope of the present invention.
The high-hardness ultra-resistant Hou Rega strip steel provided by the invention has the following performance characteristics:
1. the alloy has ultrahigh atmospheric corrosion resistance, the relative corrosion rate of the alloy and common structural steel Q355B is less than or equal to 30%, the weather resistance is more than three times that of Q355B, and the alloy is more than one time that of common weather resistant steel such as 450NOR 1.
2. Has higher strength, hardness and forming performance, the yield strength is more than or equal to 800MPa, the tensile strength is more than or equal to 900MPa, the elongation at break is more than or equal to 12 percent, the hardness HV10 is more than or equal to 300, the cold bending performance can meet the requirement of D=4t, the 180-degree bending qualification (D is the bending diameter, t is the thickness of the steel plate), and the low-temperature impact toughness and the impact energy at-20 ℃ can reach more than 60J.
In order to obtain the above properties of the steel, the invention also provides a method for producing the high-hardness super-resistant Hou Rega strip steel in a short process, wherein the main process comprises the steps of smelting a slab with the above components obtained by continuous casting, rapidly heating the slab by a soaking furnace, directly finish rolling, and coiling the rolled strip steel after two-stage cooling to obtain a hot rolled strip steel, and the key process comprises the following steps:
(1) Molten steel which is obtained by smelting and refining and accords with the steel composition of the invention is cast into a steel billet by adopting a pulling speed of more than or equal to 3.5 m/min;
(2) Directly feeding the steel billet into a soaking pit, wherein the feeding temperature is more than or equal to 850 ℃; in the soaking process of the soaking furnace, in order to reduce the influence of copper embrittlement, a weak oxidizing atmosphere is adopted, a high-temperature quick-firing process is adopted to coordinate contradiction between the copper embrittlement on the surface and the full solid solution strengthening of Ti, the heating time in the range of 1050-1200 ℃ is controlled within 10min, and a sensitive temperature range for generating the copper embrittlement and a slab low-plasticity region are quickly traversed; the billet is placed in a soaking pit for 20-35min, and the tapping temperature is 1180-1250 ℃;
(3) Adopting a multi-frame continuous rolling process in a finishing mill group, and controlling the final rolling temperature to be 850-920 ℃ according to different thickness specifications of rolled strip steel;
(4) The rolled strip steel is cooled by two sections, the first section of cooling cools the strip steel to 670-730 ℃ at a cooling speed of not lower than 50 ℃/s so as to control ferrite structure formation, and then the second section of cooling cools the strip steel to coiling temperature of 550-660 ℃ at a speed of not lower than 15 ℃/s so as to obtain the high-hardness super-resistant Hou Rega strip steel.
The reasons for limiting the chemical components of the invention are as follows:
c is the most economical and effective element for improving the hardness and strength of the material in steel, and besides solid solution strengthening, the C can form nano second phase precipitation particles with micro-alloy elements such as Ti, nb and the like, thereby playing roles in precipitation strengthening and refining the structure. C content is lower than 0.16%, and the casting blank surface defects are easy to occur due to peritectic reaction. Meanwhile, as the content of C is increased, the alloy provided by the invention also has high-content alloy elements such as Cr and the like, the hardenability of the material is gradually increased, the blank shell is thickened in the solidification process of molten steel, and the probability of cracking of the edges of the blank is gradually increased, so that the content of C is 0.16-0.50%.
Si is a commonly used deoxidizing element in steel, has solid solution strengthening effect on the steel, can improve the corrosion resistance of the material, and has a certain effect on alleviating copper embrittlement, but the higher Si content can cause serious red iron sheet defects on the surface of hot rolled strip steel, influence the surface quality of the strip steel, and simultaneously can reduce the welding performance of the material to cause the deterioration of the toughness of a welding heat affected zone; the too low Si content can lead to Al deoxidation in the smelting process, so that the cost is increased on one hand, the risk of alumina inclusion is increased on the other hand, and the forming performance of the material is affected, so that the Si content is 0.10% -0.50%.
Mn is an important strengthening element in steel, has the function of solid solution strengthening, can reduce the supercooled austenite transformation temperature, reduce the ferrite transformation temperature, is beneficial to tissue refinement, and improves the strength and toughness of the material. However, excessive Mn content suppresses ferrite transformation, and transformation of structure into bainite, and decreases the plasticity and cold formability of the material. Therefore, the Mn content of the invention is 0.2% -1.0%.
Cr is an important element for improving the weather resistance of the steel sheet. Cr is used as an important corrosion resistance element, so that the corrosion potential of a matrix can be improved, and the electrochemical impedance is reduced and the corrosion rate is improved; meanwhile, the compact rust layer formed on the surface is promoted to realize physical barrier to corrosive medium, and the corrosive environment of the substrate position is changed, and the Cr content is required to be 1.5-4.5%.
Cu is also one of important corrosion resistant elements, and the effect is more remarkable when Cr is added together. Cu can promote the formation of a compact rust layer on the surface of steel, and the atmospheric corrosion resistance of the steel can be obviously improved by adding more than 0.10% of Cu. However, cu is a metal with a low melting point, and when the strip steel is heated, copper-rich compatibility with a low melting point is easy to enrich on the surface of a substrate due to the problem of selective oxidation, and copper-brittle network cracks and skin-tilting defects are easy to form on the surface of the strip steel when steel is rolled, so that the surface quality is deteriorated. Meanwhile, cu is also a noble element, and the Cu content is 0.10-0.60%.
P is often used as an added corrosion resistant element in the traditional atmospheric corrosion resistant steel, can promote the formation of a surface protective rust layer, and effectively improves the atmospheric corrosion resistant performance of the steel, but P is also a harmful impurity element in the steel and is easy to segregate in the thickness center during billet continuous casting. Meanwhile, P is easy to generate segregation at the grain boundary, and the bonding energy of the grain boundary is reduced, so that the toughness and the plasticity of the steel are reduced. The same principle is also very disadvantageous for P-weld performance. Therefore, the invention does not adopt the atmospheric corrosion resistant steel effect of P. Considering that center segregation is liable to occur in medium-high carbon components, it is required to reduce the P content in steel as much as possible, and the P content in the invention is less than or equal to 0.02%.
S is a common harmful impurity element in steel, and has adverse effects on weather resistance, low-temperature toughness, welding performance, cold forming performance and the like, so that the S content is required to be less than or equal to 0.01 percent.
Al is an effective deoxidizing element, and meanwhile, al is favorable for refining grains and improving the toughness of steel, but higher Al is unfavorable for casting during continuous casting and is easy to block a water gap, so that the Al content is required to be less than or equal to 0.30 percent.
Ti is a strong carbonitride forming element, can be precipitated in the form of extremely fine TiC or Ti (C, N) second phase particles, and remarkably improves the strength of the material. However, when the content of Ti is too high, the precipitation strengthening effect of Ti gradually decreases, and the low-temperature toughness of the steel is remarkably affected. Therefore, the Ti content is designed to be 0.08-0.25%.
N is an impurity element in steel, N and Ti can be combined in molten steel to form larger-size TiN inclusions, so that the effective content of Ti is reduced, and the toughness of the steel is obviously damaged by the TiN inclusions, therefore, the content of N is controlled as low as possible, and the content of N is required to be less than or equal to 0.008 percent.
Nb is also a strong nitrogen carbide forming element, and can form NbC and Nb (CN) carbide particles to produce precipitation strengthening. But the cost of Nb is far higher than that of Ti, so that the strength improvement economy is not better than that of Ti, and meanwhile, the quality of a casting blank in the continuous casting and cooling process of strip steel is influenced by the excessive content of Nb, and the defects of surface cracks, angle cracks and the like are generated, so that the Nb content is less than or equal to 0.06 percent.
V is also a strong carbide forming element and can produce a strong precipitation strengthening effect. Compared with TiC and VC, the precipitation temperature is lower, and a better precipitation strengthening effect can be generated at 500-550 ℃ generally, so that V can be adopted to improve the strength when the strip steel is coiled at a lower temperature, but the economy of improving the strength by V is not as good as that of Ti, and meanwhile, the welding toughness of steel can be reduced by too high content of V, so that the V content is less than or equal to 0.15%.
Mo is an alloy element commonly used in steel, has the effects of increasing hardenability, inhibiting ferrite transformation, refining structure, improving TiC precipitation strengthening contribution and the like, and a small amount of addition is beneficial to the improvement of the performance just before, but Mo is a noble metal element, and the content is too high, so that the economical efficiency of the steel is not more than 0.40 percent, and the invention is limited.
The B has strong hardenability effect, can obviously inhibit ferrite transformation, so that the bainitic structure is obtained to improve the strength, but the plasticity and the processability of the material are reduced. Therefore, the content of B is limited to less than or equal to 0.002 percent.
Ni can improve the corrosion resistance of steel and can also improve the problem of copper brittleness quality on the surface caused by Cu by improving the melting point of a Cu-rich phase. However, ni is an important strategic material, and in recent years, the price is very high, and excessive addition greatly increases the alloy cost of the material, so that the Ni content is limited to be less than or equal to 0.40 percent.
Sb may be added as an element for improving corrosion resistance. But Sb is also a harmful element in steel, and deteriorates the properties of steel, especially low temperature toughness, so the present invention limits the Sb content to 0.15%.
Re rare earth element also has the functions of improving corrosion resistance and toughness. However, the yield of Re element in the steelmaking process is difficult to control, and excessive addition can reduce the economical efficiency of steel, so that the Re content is limited to be less than or equal to 0.15 percent.
Ca and S can form spherical dispersed CaS, so that the distribution of sulfide inclusions in steel is improved, the uniform corrosion of materials is improved, the toughness of the materials is improved, and the content of Ca is generally limited to be less than or equal to 0.015 percent.
Mg can be combined with O to form finer MgO and can be used as nucleation core of other inclusions, thereby being beneficial to refining the size of the inclusions and improving the dispersion distribution of the inclusions, and the uniform corrosion of the material and the toughness of the material can be improved, and the content of Mg is generally limited to be less than or equal to 0.015 percent.
The invention also satisfies that Si+2Ni is more than or equal to 0.10 percent. The Cu is easy to form copper embrittlement defects on the surface of the strip steel, and Si and Ni both have the effect of improving the copper embrittlement defects and can complement each other. Ni has better effect on improving copper brittleness, but the cost is higher. When the content of Si+2Ni is more than 0.10%, the method plays a role, so that the upper limit content of Si and Ni is limited, meanwhile, a proper amount of Si and Ni elements are added according to the requirement that Si+2Ni is more than or equal to 0.10%, and the balance among the design economy of the material, the surface quality of the material and the copper brittleness problem can be dynamically adjusted by utilizing the complementary relation of the Si and the Ni elements, so that the copper brittleness problem is more economically controllable.
The invention has higher steel C content and alloy content and higher cooling hardenability, and the continuous casting slab is directly fed into the heating furnace at the temperature of more than or equal to 850 ℃, so that the low plastic temperature interval of the slab can be avoided, the problems of cracking, breaking and the like of the slab in the cooling process are avoided, the heating efficiency can be improved by utilizing the waste heat of the continuous casting slab, and the energy consumption is reduced; the weak oxidizing atmosphere is adopted, and the heating time in the range of 1050-1200 ℃ is controlled within 10min, so that the problems of Cu precipitation and Cu brittleness can be effectively avoided; the billet is heated to 1180-1250 ℃ and kept in a soaking pit for 20-35min, so that homogenization of a casting blank structure and solid solution of alloy elements are realized.
The invention utilizes 1.50 to 4.50 percent of high Cr content to promote the formation of a uniform and compact rust layer, can rapidly enrich in a thinner rust layer, obviously improves corrosion potential and electrochemical impedance, and interrupts corrosion to continue to occur, thereby obtaining ultrahigh atmospheric corrosion resistance; meanwhile, the high strength, the high hardness and the high forming performance of the material are realized by utilizing solid solution strengthening with high C, cr content, precipitation strengthening of TiC and structure strengthening of ferrite, bainite and carbide formed by combining controlled rolling and controlled cooling.
Compared with the prior art, the invention has the beneficial effects that:
the high-hardness ultra-Hou Rega strip steel has very high atmospheric corrosion resistance, the relative corrosion rate between a cycle immersion test and Q355B is less than or equal to 30%, the weather resistance is more than three times that of common structural steel Q355B, and the weather resistance is also more than one time that of common weathering steel; the corrosion rate is fast attenuated along with time, and the corrosion depth of 25 years is less than or equal to 0.1mm; meanwhile, the steel has higher strength, hardness and forming performance, the yield strength is more than or equal to 800MPa, the tensile strength is more than or equal to 900MPa, the breaking elongation is more than or equal to 12%, the hardness HV10 is more than or equal to 300, the cold bending performance can meet the requirement that D=4t, 180-degree bending is qualified (D is the bending diameter, t is the thickness of the steel plate), and the low-temperature impact toughness and impact energy at the temperature of minus 20 ℃ can reach more than 60J.
The high-hardness super-resistant Hou Rega strip steel manufactured by the short-flow process has high strength, high hardness, high forming performance, economy and applicability, can meet the processing requirements of bare coating and light weight design requirements, rolling forming and the like of the surfaces of structural members such as photovoltaic brackets and the like, and meets the super-atmospheric corrosion resistance requirements of service for more than 25 years, wherein the corrosion depth in the service period is less than or equal to 0.1mm; moreover, the high hardness can reduce the abrasion of sand, foreign matters and the like on the surface of the material, and the service life of the material in the use process is prolonged.
Drawings
FIG. 1 shows a typical metallographic structure of a high-hardness ultra-high-resistance Hou Rega strip produced by the invention.
Detailed Description
For better understanding of the present invention, the inventive steel is specifically implemented based on the above-mentioned component design and process scheme of the present invention, so as to further explain the technical scheme of the present invention. The following examples further illustrate the invention, but the invention is not limited to the following examples.
Examples 1 to 8
The chemical compositions of the steel billets obtained by converter smelting, refining and continuous casting are shown in Table 1. The billet is heated in a soaking pit at a temperature of more than or equal to 850 ℃, then hot rolled and controlled cooled, and the corresponding production process is shown in Table 2. The production steel was subjected to a performance test, and the relevant properties are shown in Table 3. The production steel was tested according to TB/T2375 "periodic immersion corrosion test method for weathering steel for railway", the relative Q355B corrosion rate is given in Table 3.
The high-hardness super-resistant Hou Rega strip steel is produced according to the following steps:
(1) Molten steel with steel components shown in table 1 is obtained through smelting and refining, and is cast into billets at a pulling rate of more than or equal to 3.5 m/min;
(2) Directly feeding the steel billet into a soaking pit, wherein the feeding temperature is more than or equal to 850 ℃; a weak oxidizing atmosphere (air: gas=1.02-1.08) is adopted, the heating time in the range of 1050-1200 ℃ is controlled within 10min, and the sensitive temperature range and the slab low plasticity region which generate copper brittleness are quickly traversed; the billet is placed in a soaking pit for 20-35min, and the tapping temperature is 1180-1250 ℃;
(3) 7-frame continuous rolling technology is adopted in a finishing mill group, and the final rolling temperature is controlled to be 850-920 ℃ according to the thickness of rolled strip steel within the range of 1.5-6 mm;
(4) The rolled strip steel is cooled by two sections, the first section of cooling cools the strip steel to 670-730 ℃ at a cooling speed of not lower than 50 ℃/s so as to control ferrite structure formation, and then the second section of cooling cools the strip steel to coiling temperature of 550-660 ℃ at a speed of not lower than 15 ℃/s so as to obtain the high-hardness super-resistant Hou Rega strip steel.
TABLE 1 chemical compositions produced in accordance with examples of the present invention
TABLE 2 Process parameters for the production of the examples of the invention
TABLE 3 relative Corrosion Rate of the inventive examples for producing strip Steel Performance and comparison
Note that: the impact toughness test pieces of examples 1 to 3 were not processed and tested with a gauge thickness of 3mm or less, and the impact performance test results were not required even with a gauge thickness of 5mm or less.
The high-hardness super-resistant Hou Rega strip produced by the invention has a typical structure of ferrite, bainite and carbide, as shown in figure 1.
According to the detection result of the relative corrosion rate (accelerated corrosion weight reduction ratio), the corrosion performance of the high-hardness ultra-Hou Rega strip steel produced by the method reaches about 2 times of that of the weather-resistant steel 450NOR1 for railway vehicles, and the weather-resistant steel for railway vehicles is mainly used for railway trucks, and the service life of the steel is generally 25 years under normal conditions. The corrosion depth of 25 years can be less than or equal to 0.1mm by combining the accelerated corrosion detection result and the actual thickness measurement of the high-hardness ultra-Hou Rega strip steel produced by the method.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and changes can be made by those skilled in the art without departing from the inventive concept and remain within the scope of the invention.

Claims (8)

1. A short-process high-hardness super-resistant Hou Rega strip steel is characterized by comprising the following chemical components in percentage by weight: 0.16 to 0.50 percent of C, 0.10 to 0.50 percent of Si, 0.20 to 1.00 percent of Mn, 1.50 to 4.50 percent of Cr, 0.10 to 0.60 percent of Cu, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.30 percent of Al, 0.08 to 0.25 percent of Ti, less than or equal to 0.008 percent of N, and the balance of Fe and unavoidable impurity elements.
2. The short-process high-hardness ultra-Hou Rega strip steel according to claim 1, wherein the weight percentage of Al is less than or equal to 0.10%.
3. The short-process high-hardness ultra-Hou Rega strip steel according to claim 1, wherein the weight percentage of Si and Ni is more than or equal to 0.10% of Si+2Ni.
4. The short-process high-hardness ultra-resistant Hou Rega strip steel according to claim 1, wherein the chemical components comprise, by weight, less than or equal to 0.06% of Nb, less than or equal to 0.15% of V, less than or equal to 0.40% of Mo, less than or equal to 0.002% of B, less than or equal to 0.40% of Ni, less than or equal to 0.15% of Sb, less than or equal to 0.15% of Re, less than or equal to 0.015% of Ca, and less than or equal to 0.015% of Mg.
5. The short-process high-hardness ultra-Hou Rega strip steel according to claim 1, wherein the corrosion rate of the hot rolled strip steel relative to Q355B structural steel is less than or equal to 30%, the yield strength is more than or equal to 800MPa, the tensile strength is more than or equal to 900MPa, the hardness HV10 is more than or equal to 300, and the elongation at break is more than or equal to 12%.
6. The short-process high-hardness super-Hou Rega strip steel according to claim 1, wherein the low-temperature impact toughness and the impact energy at-20 ℃ reach more than 60J when the rolling thickness of the hot rolled strip steel is not less than 3.5 mm.
7. A method for producing the high-hardness ultra-Hou Rega strip steel according to any one of claims 1 to 6 in a short process,
(1) Molten steel with target components obtained through smelting and refining is cast into a steel billet at a pulling rate of more than or equal to 3.5 m/min;
(2) Directly feeding the steel billet into a soaking pit, wherein the feeding temperature is more than or equal to 850 ℃, weak oxidizing atmosphere is adopted, and the heating time in the range of 1050-1200 ℃ is controlled within 10 min; the billet is placed in a soaking pit for 20-35min, and the tapping temperature is 1180-1250 ℃;
(3) Adopting a multi-frame continuous rolling process in a finishing mill group, and controlling the final rolling temperature to be 850-920 ℃ according to different thickness specifications of rolled strip steel;
(4) The rolled strip steel is cooled by two sections, the first section of cooling cools the strip steel to 670-730 ℃ at a cooling speed of not lower than 50 ℃/s, and then the second section of cooling cools the strip steel to 550-660 ℃ at a coiling temperature of not lower than 15 ℃/s, so that the high-hardness super-resistant Hou Rega strip steel is obtained.
8. The method of claim 7, wherein the rolled strip has a thickness in the range of 1.5-8 mm.
CN202311243791.6A 2023-09-26 2023-09-26 Short-flow high-hardness super-resistant Hou Rega strip steel and production method thereof Pending CN117089770A (en)

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