CN113278777B - Method for controlling steel strip-shaped structure of alloy structure - Google Patents
Method for controlling steel strip-shaped structure of alloy structure Download PDFInfo
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention relates to a method for controlling a steel strip-shaped structure of an alloy structure, which comprises the steps of controlling the superheat degree delta t of molten steel in casting according to the carbon content of the alloy structure steel in the casting process, wherein the basic superheat degree range of the alloy structure steel is (A1-A2) DEG C, further reducing the superheat degree according to 10 times of the mass percentage C of the carbon content of the alloy structure steel on the basis of the basic superheat degree, and the superheat degree delta t of the molten steel in casting is according to [ (A) 1 ‑10*C)～(A 2 ‑10*C)]Setting at the temperature, wherein C is the mass percent of the carbon content of the alloy structural steel; controlling the index of the secondary cooling specific water quantity of continuous casting billet cooling during casting according to the carbon content of alloy structural steel in the casting process, wherein the index of the secondary cooling specific water quantity of continuous casting is according to [0.9+0.2 x C]L/kg, wherein C is the mass percent (%) of carbon content; and reheating the continuous casting blank by adopting a preheating section, a soaking section and a heating section, wherein the heating temperature and the heating time of each section are controlled according to the specifications of products, and the heating temperature and the heating time are improved.
Description
Technical Field
The invention belongs to the technical field of iron-based alloys, and particularly relates to alloy structural steel.
Background
The alloy structural steel is mainly used as mechanical parts, automobile parts, engineering components and the like. Because of the effect of alloy elements, the alloy structural steel has better mechanical properties, and the high-quality alloy structural steel is an important foundation of the modern industry.
The strip structure of the alloy structural steel can cause anisotropy of the steel, and the strength and toughness of the steel are reduced; can cause the adverse effects of easy deformation, reduced cold bending performance, high stamping rejection rate and the like of the steel after heat treatment, thereby influencing the production efficiency of industrial parts and the service life of products.
The alloy structural steel has a certain content of carbon elements and alloy elements, which inevitably generate dendrite segregation in the casting process, and form proeutectoid ferrite strips and pearlite strips along the rolling direction of the steel in the rolling process, and the proeutectoid ferrite strips and the pearlite strips are mutually stacked to finally generate a strip-shaped structure. The control of the strip structure is a difficult point in the field of metallurgical production, and the strip structure of the alloy structural steel at the advanced level in the world can be stably controlled to be less than or equal to 2.0 level at present.
The reason for the generation of the steel strip-shaped structure of the alloy structure is as follows: the segregation of carbon and alloy elements in the continuous casting process generates micro segregation. The biased chemical elements generally lower the Ar3 temperature of the steel, thereby promoting the formation of a steel band structure. During rolling, dendrite segregation in the steel slab is elongated along the rolling direction, forming proeutectoid ferrite strips and pearlite strips along the rolling direction of the steel, which are stacked on each other to finally produce a strip-like structure.
The existing research results show that: the technological parameters in the casting process of the casting blank and the heating process of the casting blank have great influence on dendrite segregation and inter-dendrite segregation of carbon elements and alloy elements, so that the final strip-shaped structure of the steel is determined. Formulating reasonable continuous casting superheat degree and specific water quantity index according to alloy structural steels with different carbon contents; according to the alloy structural steel with different carbon contents and casting blanks with different specifications, reasonable heating temperature and heating time are formulated, and the steel strip-shaped structure of the alloy structure can be effectively controlled.
Patent CN 103194580A discloses a rolling method of low band structure alloy structural steel, which reduces the band structure of the alloy structural steel to a lower level through the procedures of billet heating-rough rolling-intermediate rolling-water cooling-finish rolling-water cooling-air cooling-shearing-slow cooling and proper technological parameters.
Patent 200810223796.1 discloses a control method for strip-shaped structure of alloy structural steel, which comprises the steps of pretreating molten iron, converter-ladle refining, vacuum degassing and continuous casting of steel billets, heating the steel billets, rolling the steel billets by 20 continuous rolling mills, and controlling hot rolled round steel produced at different final rolling temperatures to ensure that the grade of the strip-shaped structure of the alloy structural steel is less than or equal to 2.5, thereby meeting the requirements of users.
The control level of the strip-shaped tissue is realized by the measures of controlling the temperature of the water passing cooling in the rolling process, cooling after rolling and the like, but the control process is complex, the operation difficulty is high, and the control effect of the strip-shaped tissue is difficult to ensure effectively.
Disclosure of Invention
In order to solve the problem of obvious banded structure in the alloy structural steel, the invention aims to provide a brand-new production process method for controlling continuous casting superheat degree, secondary cooling water ratio index, casting blank heating temperature and heating time, and the new method after optimization can control the banded structure grade in the alloy structural steel to be less than or equal to 2.0 grade.
The invention solves the problems by adopting the following technical scheme: a method for controlling the band-shaped structure of alloy structural steel, which is obtained by hot rolling a casting blank cast by molten steel, comprises the following steps
(1) Casting blank by continuous casting process
(1.1) controlling the superheat degree Deltat of molten steel in casting according to the carbon content of the alloy structural steel in the casting process, wherein the basic superheat degree range of the alloy structural steel is (A1-A2), the superheat degree is further reduced according to 10 times of the mass percent C of the carbon content of the alloy structural steel on the basis of the basic superheat degree, and the superheat degree Deltat of the molten steel in casting is according to [ (A) 1 -10*C)～(A 2 -10*C)]C is set at the temperature, wherein C is the mass percent of the carbon content of the alloy structural steel.
Continuous casting superheat Δt=t Tundish -T Molten steel The setting of the superheat degree of the continuous casting base is firstly considered to be the production efficiency of the casting blank, and the temperature of the tundish is too low (near or below the liquidus temperature of the steel grade) and possibly causes the molten steel to be 'dead' in the water gap of the crystallizer "The method comprises the steps of carrying out a first treatment on the surface of the Too high a tundish temperature may cause steel leakage. The two conditions reduce the production efficiency of the billet to a certain extent, and reduce the yield of the billet. The superheat degree of the alloy structural steel is continuously adjusted, a large number of production tests and large data acquisition and analysis are carried out, the basic superheat degree range of the alloy structural steel is determined to be (A1-A2) DEG C, the superheat degree range can ensure the optimal production efficiency of the alloy structural steel, and the determined standard is the highest or higher superheat degree range for ensuring that steel leakage does not occur in the continuous casting process. On the basis, further considering improvement of the strip structure in the structural steel, and observing the influence of different superheat degrees on the strip structure level by adjusting the basic superheat degree range and carrying out a large-scale production test, the optimal superheat degree adjusting variable in the process of casting the molten steel of the alloy structural steel is found to be-10 x C, C is the mass percent (%) of C element in the alloy structural steel, namely the optimal continuous casting superheat degree range is [ (A) 1 -10*C)～(A 2 -10*C)]The composition segregation and the banded structure of the alloy structural steel produced according to the superheat degree range can be optimized, and meanwhile, the casting blank yield is relatively high.
And (1.2) controlling the index of the secondary cooling water ratio of the cooling of the continuous casting blank during casting according to the carbon content of the alloy structural steel in the casting process, wherein the index of the secondary cooling water ratio of the continuous casting is set according to [0.9+0.2 x C ] L/kg, and C is the mass percent (%) of the carbon content.
The index of the secondary cooling specific water quantity is the ratio of the total water quantity consumed in unit time of a secondary cooling zone of the continuous casting machine to the mass of a casting blank passing through the secondary cooling zone in unit time, n is a constant of 1.15, and L/kg is taken as a unit. The production test is carried out by continuously adjusting the continuous casting specific water yield index to obtain the basic specific water yield index of the alloy structural steel, the setting of the basic specific water yield index can lead the alloy structural steel to obtain the optimal surface quality, namely, the continuous casting billet surface is flat and smooth without defects, and generally, the basic specific water yield index is 0.90L/kg for the basic alloy structural steel, so that the production can be satisfied. In order to reduce segregation of a continuous cast slab and a band structure of a steel material, it is necessary to increase a base specific water content index. And obtaining the variable +0.2xC of the specific water quantity index of the alloy structural steel through a large-scale specific water quantity index adjustment process test and corresponding large data acquisition and analysis. I.e. the specific water index should be set to (0.90+0.2 x c) L/kg. The alloy structural steel produced according to the specific water quantity index has the advantages of optimal composition segregation and banded structure, and better surface quality of casting blanks.
(2) Reheating continuous casting billets before rolling
Adopting a preheating section, a soaking section and a heating section to reheat the continuous casting billet, wherein the heating temperature and the heating time of each section are set with reference:
(2.1) for square billet continuous casting blanks, preheating section: the heating temperature is [ (650-800) +50deg.C ]. C, and the heating time [ (h 0.20+10) - (h 0.45+10) ] min; and (3) a soaking section: the heating temperature is [ (1000-1150) +100×C ]. DEG C, and the heating time [ (h 0.25+10) - (h 0.50+10) ] min; and (3) heating: heating temperature [ (1100-1250) +100×C ]. DEG C, heating time [ (h 0.25+10) to (h 0.60+10) ] min.
(2.2) for round billet continuous casting, preheating section: heating temperature [ (650-800) +50deg.C ]. C, heating time [ (d 0.25+20) - (d 0.50+20) ] min; and (3) a soaking section: heating temperature [ (1000-1150) +100×C ]. DEG C, heating time [ (d 0.30+20) to (d 0.55+20) ] min; and (3) heating: the heating temperature is [ (1100-1250) +100×C ]. DEG C, and the heating time is [ (d 0.30+20) - (d 0.65+20) ] min.
Wherein C is the mass percent (%) of the carbon content of the alloy structural steel; d is the diameter (mm) of the continuous casting round billet; h is the thickness (mm) of the continuous casting square billet.
The setting of the basic heating temperature of the three-section heating process of the steel rolling is preferentially considered to save energy, a large number of experiments prove that the setting of the basic heating temperature can save energy as much as possible under the premise of meeting production, the setting of the basic heating temperature interval is based on ensuring the plasticity of the steel in the rolling process, and providing blanks with excellent heating quality for the rolling mill, thereby ensuring the service life of the rolling mill. In order to reduce segregation of the continuous casting slab and the band structure of the steel, the steel rolling heating temperature can be appropriately increased. The best steel rolling temperature variable is obtained through large-scale process test and searching. The three-stage heating temperature of the steel rolling is properly adjusted according to different carbon contents, and environmental protection and energy saving are considered while the segregation and the banded structure of the steel are improved.
Further, the chemical composition (100% by mass) of the alloy structural steel suitable for the above control method satisfies C:0.08 to 0.60 percent, si:0.17 to 1.40 percent, mn:0.30 to 2.60 percent of Cr, 0.10 to 1.65 percent of Mo, less than or equal to 0.55 percent, less than or equal to 4.50 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.50 percent of V, less than or equal to 0.10 percent of Ti, less than or equal to 1.10 percent of Al, less than or equal to 0.0035 percent of B and less than or equal to 1.20 percent of W. The molten steel based on the chemical component has the basic superheat degree range (A1-A2) DEG C which is (35-55) DEG C through field test.
Compared with the prior art, the invention has the advantages that: the invention adjusts the continuous casting superheat degree and the secondary cooling specific water quantity index according to different carbon contents of the alloy structural steel. The heating temperature and the heating time of the alloy structural steel with different carbon contents and casting blanks with different specifications are adjusted, so that the strip-shaped structure of the alloy structural steel is improved, and the grade of the strip-shaped structure is reduced to be below 2.0 grade. The invention has the characteristics of simple and convenient production operation, easy control and the like.
Detailed Description
The invention is described in further detail in the following in conjunction with the examples which are meant to be illustrative of the invention and not to be construed as limiting the invention.
Example 1:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 55mm.
Continuous casting: the superheat degree of the tundish is 34 ℃, and the index of the secondary cooling specific water quantity is 0.94L/kg.
The continuous casting square billet is heated in a heating furnace: the temperature of the preheating section is 699 ℃ and the time is 89 minutes; the heating section temperature is 1042 ℃, the time is 101 minutes, the soaking section temperature is 1145 ℃, and the time is 102 minutes.
The steel grade produced in this example had a major chemical composition of 0.20% C, 0.23% Si, 0.65% Mn, 0.82% Cr, 0.015% P, and 0.002% S. The band structure grade of the rolled steel is 1.5 grade.
Comparative example 1:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 55mm.
Continuous casting: the superheat degree of the tundish is 54 ℃, and the index of the secondary cooling specific water quantity is 0.91L/kg.
The continuous casting square billet is heated in a heating furnace: preheating section temperature 653 ℃ for 74 minutes; the heating section temperature was 1008 ℃, the time was 93 minutes, the soaking section temperature was 1112 ℃, and the time was 91 minutes.
The steel grade produced in this example had a major chemical composition of 0.20% C, 0.25% Si, 0.66% Mn, 0.81% Cr, 0.013% P, and 0.002% S. The band structure grade of the rolled steel is 3.0 grade.
Example 2:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 65mm.
Continuous casting: the superheat degree of the tundish is 36 ℃, and the index of the secondary cooling specific water quantity is 0.96L/kg.
The continuous casting square billet is heated in a heating furnace: the temperature of the preheating section is 706 ℃ and the time is 86 minutes; the heating section temperature is 1061 ℃, the time is 101 minutes, the soaking section temperature is 1163 ℃ and the time is 102 minutes.
The steel grade produced in this example has the main chemical components of 0.30% C, 0.27% Si, 1.56% Mn, 0.017% P and 0.003% S. The band structure grade of the rolled steel is 1.0 grade.
Comparative example 2:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 65mm.
Continuous casting: the superheat degree of the tundish is 31 ℃, and the index of the secondary cooling specific water quantity is 0.96L/kg.
The continuous casting square billet is heated in a heating furnace: preheating section temperature 652 ℃, time 73 minutes; the temperature of the heating section is 1021 ℃ for 91 minutes, the temperature of the soaking section is 1120 ℃ for 89 minutes.
The steel grade produced in this example has a major chemical composition of 0.30% C, 0.29% Si, 1.55% Mn, 0.016% P, and 0.002% S. The band structure grade of the rolled steel is 2.5 grade.
Example 3:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 80mm.
Continuous casting: the superheat degree of the tundish is 32 ℃, and the index of the secondary cooling specific water quantity is 0.97L/kg.
The continuous casting square billet is heated in a heating furnace: the temperature of the preheating section is 709 ℃ and the time is 89 minutes; the heating section temperature is 1067 ℃, the time is 100 minutes, the soaking section temperature is 1162 ℃ and the time is 105 minutes.
The steel grade produced in this example had a major chemical composition of 0.35% C, 0.26% Si, 0.56% Mn, 0.96% Cr, 0.19% Mo, 0.013% P, and 0.002% S. The band structure grade of the rolled steel is 1.5 grade.
Comparative example 3:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 80mm.
Continuous casting: the superheat degree of the tundish is 53 ℃, and the index of the secondary cooling specific water quantity is 0.93L/kg.
The continuous casting square billet is heated in a heating furnace: preheating section temperature 661 ℃ for 79 minutes; the heating section temperature is 1029 ℃, the time is 93 minutes, the soaking section temperature is 1122 ℃, and the time is 92 minutes.
The steel grade produced in this example had a major chemical composition of 0.35% C, 0.25% Si, 0.55% Mn, 0.012% P, 0.19% Mo, 0.012% P, and 0.002% S. The band structure grade of the rolled steel is 2.5 grade.
Example 4:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 70mm.
Continuous casting: the superheat degree of the tundish is 31 ℃, and the index of the secondary cooling specific water quantity is 1.00L/kg.
The continuous casting square billet is heated in a heating furnace: preheating section temperature 719 ℃ for 89 minutes; the temperature of the heating section is 1083 ℃, the time is 102 minutes, the temperature of the soaking section is 1185 ℃, and the time is 103 minutes.
The steel grade produced in this example has the main chemical composition of C0.50%, si 0.26%, mn 0.59%, cr 0.67%, ni:1.25 percent, 0.012 percent of P and 0.003 percent of S. The band structure grade of the rolled steel is 1.5 grade.
Comparative example 4:
the production process comprises the following steps: 100tEAF+LF+VD+CCM (300 mm. Times.340 mm) casting blank-continuous casting billet heating-continuous casting billet rolling to phi 70mm.
Continuous casting: the superheat degree of the tundish is 52 ℃, and the index of the secondary cooling specific water quantity is 0.92L/kg.
The continuous casting square billet is heated in a heating furnace: preheating section temperature 672 ℃ for 77 minutes; the heating section temperature is 1041 ℃, the time is 93 minutes, the soaking section temperature is 1142 ℃ and the time is 92 minutes.
The steel grade produced in this example has the main chemical composition of C0.50%, si 0.25%, mn 0.58%, cr 0.69%, ni:1.25 percent, 0.013 percent of P and 0.003 percent of S. The band structure grade of the rolled steel is 3.0 grade.
Example 5:
the production process comprises the following steps: 100tBOF+LF+RH+CCM (phi 600 mm), casting blank-continuous casting round billet heating-continuous casting square billet rolling to phi 120mm.
Continuous casting: the superheat degree of the tundish is 36 ℃, and the index of the secondary cooling specific water quantity is 0.94L/kg.
The heating process of the continuous casting round billet in a heating furnace comprises the following steps: preheating section temperature 701 ℃ for 189 minutes; the temperature of the heating section is 1056 ℃ and the time is 221 minutes; soaking section temperature 1159 ℃ and soaking time 237 minutes.
The main chemical components of the high-grade automobile steel produced in the embodiment are 0.20% of C, 0.22% of Si, 1.16% of Mn, 1.17% of Cr, 0.012% of P and 0.002% of S. The band structure grade of the rolled steel is 0.5 grade.
Comparative example 5:
the production process comprises the following steps: 100tBOF+LF+RH+CCM (phi 600 mm), casting blank-continuous casting round billet heating-continuous casting square billet rolling to phi 120mm.
Continuous casting: the superheat degree of the tundish is 27 ℃, and the index of the secondary cooling specific water quantity is 0.91L/kg.
The heating process of the continuous casting round billet in a heating furnace comprises the following steps: preheating section temperature 656 ℃ for 166 minutes; the temperature of the heating section is 1009 ℃ and the time is 191 minutes; soaking section temperature 1112 ℃ for 201 minutes.
The main chemical components of the high-grade automobile steel produced in the embodiment are 0.20% of C, 0.23% of Si, 1.15% of Mn, 1.17% of Cr, 0.011% of P and 0.002% of S. The band structure grade of the rolled steel is 2.5 grade.
Example 6:
the production process comprises the following steps: 100tBOF+LF+RH+CCM (phi 600 mm), casting blank-continuous casting round billet heating-continuous casting square billet rolling to phi 110mm.
Continuous casting: the superheat degree of the tundish is 45 ℃, and the index of the secondary cooling specific water quantity is 0.98L/kg.
The heating process of the continuous casting round billet in a heating furnace comprises the following steps: preheating section temperature 713 ℃ for 189 minutes; heating section temperature 1073 ℃ for 219 minutes; soaking section temperature 1179 ℃ for 237 minutes.
The main chemical components of the high-grade automobile steel produced in the embodiment are 0.40% of C, 0.23% of Si, 0.69% of Mn, 1.08% of Cr, 0.21% of Mo, 0.012% of P and 0.002% of S. The band structure grade of the rolled steel is 0.5 grade.
Comparative example 6:
the production process comprises the following steps: 100tBOF+LF+RH+CCM (phi 600 mm), casting blank-continuous casting round billet heating-continuous casting square billet rolling to phi 110mm.
Continuous casting: the superheat degree of the tundish is 29 ℃, and the index of the secondary cooling specific water quantity is 0.92L/kg.
The heating process of the continuous casting round billet in a heating furnace comprises the following steps: preheating section temperature 665 deg.c for 165 min; heating section temperature 1035 ℃ for 196 minutes; soaking section temperature 1135 ℃ for 193 min.
The main chemical components of the high-grade automobile steel produced in the embodiment are 0.40% of C, 0.26% of Si, 0.68% of Mn, 1.09% of Cr, 0.21% of Mo, 0.011% of P and 0.002% of S. The band structure grade of the rolled steel is 2.5 grade.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (1)
1. The method for controlling the steel strip-shaped structure of the alloy structure steel is characterized in that a casting blank cast by molten steel is obtained by hot rolling, and the method is characterized in that: the alloy structural steel comprises the following chemical components in percentage by weight: 0.08 to 0.60 percent, si:0.17 to 1.40 percent, mn:0.30 to 2.60 percent of Cr, 0.10 to 1.65 percent of Mo, less than or equal to 0.55 percent, less than or equal to 4.50 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.50 percent of V, less than or equal to 0.10 percent of Ti, less than or equal to 1.10 percent of Al, less than or equal to 0.0035 percent of B and less than or equal to 1.20 percent of W;
the method for controlling the band-shaped tissue comprises
(1) Casting blank by continuous casting process
(1.1) controlling the superheat degree Deltat of molten steel in casting according to the carbon content of alloy structural steel in the casting process, wherein the basic superheat degree range of the alloy structural steel is (A1-A2) DEG C, the alloy structural steel based on the above element components, the basic superheat degree range (A1-A2) DEG C is (35-55) DEG C, the superheat degree is further reduced according to 10 times of the carbon content of the alloy structural steel in mass percent C on the basis of the basic superheat degree, and the superheat degree Deltat of the molten steel in casting is according to [ (A) 1 -10*C）～（A 2 -10 x C) ]c, wherein C is the mass percent of the carbon content of the alloy structural steel;
(1.2) controlling the index of the secondary cooling water ratio of continuous casting billet cooling during casting according to the carbon content of the alloy structural steel in the casting process, wherein the index of the secondary cooling water ratio of continuous casting is set according to [0.9+0.2 x C ] L/kg, and C is the mass percent of the carbon content;
(2) Reheating continuous casting billets before rolling
Reheating the continuous casting billet by adopting a preheating section, a soaking section and a heating section, wherein the heating temperature and the heating time of each section are controlled according to the specification of the product, and reference is made to:
(2.1) for square billet continuous casting blanks, preheating section: the heating temperature is [ (650-800) +50deg.C ]. C, and the heating time [ (h 0.20+10) - (h 0.45+10) ] min; and (3) a soaking section: the heating temperature is [ (1000-1150) +100×C ]. DEG C, and the heating time [ (h 0.25+10) - (h 0.50+10) ] min; and (3) heating: heating temperature [ (1100-1250) +100×C ]. DEG C, heating time [ (h 0.25+10) to (h 0.60+10) ] min;
(2.2) for round billet continuous casting, preheating section: heating temperature [ (650-800) +50deg.C ]. C, heating time [ (d 0.25+20) - (d 0.50+20) ] min; and (3) a soaking section: heating temperature [ (1000-1150) +100×C ]. DEG C, heating time [ (d 0.30+20) to (d 0.55+20) ] min; and (3) heating: heating temperature [ (1100-1250) +100×C ]. DEG C, heating time [ (d 0.30+20) to (d 0.65+20) ] min;
wherein C is the mass percent of the carbon content of the alloy structural steel; d is the diameter of the continuous casting round billet, and the unit is: mm; h is the thickness of the continuous casting square billet, and the unit is mm.
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