CN109023069B - NbC nanoparticle reinforced X80 plastic pipe steel plate and manufacturing method thereof - Google Patents

NbC nanoparticle reinforced X80 plastic pipe steel plate and manufacturing method thereof Download PDF

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CN109023069B
CN109023069B CN201811023914.4A CN201811023914A CN109023069B CN 109023069 B CN109023069 B CN 109023069B CN 201811023914 A CN201811023914 A CN 201811023914A CN 109023069 B CN109023069 B CN 109023069B
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CN109023069A (en
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刘文月
任毅
王爽
张帅
高红
应传涛
徐烽
渠秀娟
刘祥
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Angang Steel Co Ltd
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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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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    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
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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
    • 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—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
    • 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
    • C21D2211/004—Dispersions; Precipitations
    • 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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Abstract

The invention provides a steel plate for an NbC nano-particle reinforced X80 plastic pipe and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by weight: 0.06 to 0.12 percent of C, 0.10 to 0.30 percent of Si, 0.60 to 1.40 percent of Mn, 0.07 to 0.15 percent of Nb, 0.001 to 0.004 percent of N, 0.01 to 0.04 percent of Ti, 0.025 to 0.045 percent of Al, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Mo, 0.12 to 0.30 percent of Cr, 0.12 to 0.30 percent of Ni, and the balance of Fe and inevitable impurity elements. The production method comprises the steps of material preparation → converter or electric furnace smelting → external refining → casting → slab reheating → controlled rolling → controlled cooling. The steel plate produced by the invention ensures the safety of oil and gas conveying pipeline pipes laid in geological complex zones, and meets the requirements of high-pressure conveying of natural gas, petroleum and the like.

Description

NbC nanoparticle reinforced X80 plastic pipe steel plate and manufacturing method thereof
Technical Field
The invention belongs to the field of metal materials, and particularly relates to a steel plate for an X80 plastic pipe and a manufacturing method thereof.
Background
With the increasing demand of oil and gas resources, the investment construction of new oil and gas fields is increased. Because the production area and the consumption area of oil gas often need to pass through areas with severe geological conditions, such as a frozen soil zone, an earthquake zone, a desert and the like, a long oil gas transmission pipeline is required to have good plastic deformation capacity. Typical performance parameters for characterizing the plastic deformation capability of the pipe are low yield ratio (such as Rt0.5/Rm is less than or equal to 0.80) and high uniform elongation (such as uEL is more than or equal to 10%).
To obtain good plastic deformability, two approaches are generally used: 1) increasing the wall thickness of the pipe; 2) increasing the volume fraction of the high plastic phase in the pipe. In practical application, the two methods are used separately or in combination, and have certain disadvantages. The wall thickness of the pipe is increased, so that the construction investment of the pipeline is increased, and the cost performance is reduced; increasing the high plasticity phase in the pipe limits the strength of the pipe (the high plasticity phase is usually a low strength phase), which is not in line with the trend of using high strength materials for high pressure transportation of oil and gas resources.
At present, steel plates for plastic pipes are mostly dual-phase steel plates, and two production process routes are mainly adopted, namely hot rolling supply after controlled rolling and controlled cooling (TMCP), and the steel plates after controlled rolling and controlled cooling are used after heat treatment. Because a two-phase structure strategy is adopted to ensure the plastic deformation capability, the structure with large difference of two-phase strength is unfavorable for improving the low-temperature toughness and the HIC resistance of the material. For example, CN201510830269.7 discloses a high strength, toughness and low yield ratio quenched and tempered steel plate for low temperature environment, which comprises the following chemical components in percentage by weight: c: 0.045-0.068%; si: 0.13-0.25%; mn: 1.55-1.74%; p is less than or equal to 0.020%; s is less than or equal to 0.0015 percent; cr: 0.25 to 0.33 percent; cu: 0.14 to 0.21 percent; ni: 0.18 to 0.25 percent; nb: 0.035-0.044%; v: 0.033 to 0.049%; ti: 0.010-0.016%; the others are Fe and inevitable impurities. The patent obtains a single-phase bainite structure through a modulation process, ensures the low-temperature toughness of two steel plates, but does not obtain the excellent plastic deformation capacity of the invention. CN201510419067.3 provides a novel Cu-containing pipeline steel with excellent hydrogen sulfide corrosion resistance while ensuring high strength and toughness, the alloy components and weight percentage are as follows: c: 0.015-0.035%; si: 0.10-0.20%; mn: 0.8-1.1%; cu: 1.0-2.0%; ni: 0.30-0.40%; mo: 0.30-0.40%; cr: 0.30-0.40%; nb: 0.04-0.06%. The Nb content in the invention is obviously lower than that in the technical scheme of the invention, and the excellent HIC capability in the invention is derived from Cu with high content, which is essentially different from the corrosion resistance principle in the invention. Patents CN101456034A and WO2009125863 provide X70 and X80 pipeline steels based on strain design requirements and preparation methods thereof, which can obtain high plastic deformability, but the organization structure thereof is an F-B type dual-phase structure, and has significant difference from the single-phase structure of the invention.
Therefore, the steel plate has high plastic deformation capacity, high and low temperature toughness and HIC resistance on the basis of single-phase structure through reasonable component design and process matching.
Disclosure of Invention
The present invention has been made to overcome the above problems and disadvantages, and an object of the present invention is to provide a steel sheet for NbC nanoparticle-reinforced X80 plastic pipes, which can ensure the safety of oil and gas transmission line pipes laid in geological complex zones and satisfy the use for high-pressure transmission of natural gas, petroleum, and the like, and a method for manufacturing the same.
The purpose of the invention is realized as follows:
a steel plate for an NbC nanoparticle reinforced X80 plastic pipe comprises the following components in percentage by weight: 0.06 to 0.12 percent of C, 0.10 to 0.30 percent of Si, 0.60 to 1.40 percent of Mn, 0.07 to 0.15 percent of Nb, 0.001 to 0.004 percent of N, 0.01 to 0.04 percent of Ti, 0.025 to 0.045 percent of Al, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Mo, 0.12 to 0.30 percent of Cr, 0.12 to 0.30 percent of Ni, and the balance of Fe and inevitable impurity elements.
Furthermore, the microstructure of the steel plate is ferrite, nano-sized NbC particles are uniformly distributed on a ferrite phase interface, the size of the NbC particles is not more than 300nm, and the volume fraction of the NbC particles is 0.05-0.20%.
The invention has the following design reasons:
c: the most economic and basic strengthening elements in the steel have obvious effect on improving the strength of the steel through solid solution strengthening and precipitation strengthening, but the improvement of the content of C has negative influence on the plasticity, toughness and weldability of the steel; in the present invention, the main role of C is to combine with Nb element to form nano-sized NbC particles for reinforcing materials. Therefore, the content range of C is set to be 0.06% -0.12%.
Si: si has the functions of deoxidizing steel-making and improving the strength of a matrix. If the Si is excessive, the toughness of a welding heat affected zone of the base metal is reduced, and the field welding construction is affected; the content of Si is increased, ferrite can be purified, the content of pearlite is reduced, and the Bauschinger effect of a base material is reduced. Therefore, the Si content is set to 0.10% to 0.30% in the present invention.
Mn: the improvement of the strength of steel by solid solution strengthening is the most important and economical strengthening element in line pipe steel to compensate for the strength loss caused by the decrease in C content. Mn contributes to obtaining a fine low-temperature phase change product and can improve the toughness of the steel. The increase of Mn content can aggravate the center segregation of the continuous casting billet, and is not beneficial to the improvement of the low-temperature toughness and the HIC resistance of the steel plate. Therefore, the Mn content range of the present invention is designed to be 0.60% to 1.40%.
Nb: nb is one of common elements in modern microalloyed pipeline steel, and has good fine grain strengthening and precipitation strengthening effects; NbC is precipitated on a material matrix, so that the yield strength of the material can be improved on the premise of not obviously influencing the plastic deformation capacity of the material; excess Nb increases the cost and difficulty of the continuous casting process. The content range of Nb is selected to be 0.07-0.15 percent.
Ti: is a strong solid N element and exists in the form of TiN in the continuous casting of the plate blank. The fine TiN particles can effectively inhibit the austenite grains from growing large when the plate blank is reheated, and are beneficial to improving the solid solubility of Nb in austenite and improving the impact toughness of a welding heat affected zone. When the addition amount of Ti exceeds a certain value, the TiN particles will be coarsened, and the stress concentration level of the particle interface and the matrix is improved. Therefore, the Ti content range is 0.01-0.04%.
N: the N element in the steel has no other obvious beneficial effects in X80 steel plates for plastic pipes except for forming fine TiN grain refined austenite grains, so that the N element needs to be kept at a lower content level, and the N content range selected by the invention is 0.001-0.004%.
Al: in general, AlN also has a function of refining the structure when it is formed as a deoxidizer in steel. When the content of Al exceeds 0.045%, excessive alumina inclusions may degrade the cleanliness of the steel. If the content of Al is too low, deoxidation becomes insufficient, and an easily oxidizable element such as Ti forms an oxide, so the lower limit of the content of Al is set to 0.025%.
Cr, Mo, Cu, Ni: cr and Mo are main elements for delaying ferrite formation and promoting acicular ferrite formation, play an important role in controlling phase transformation structures, are added under certain cooling conditions and finishing temperature, can obtain bainite structures, and are favorable for reasonable matching of strength, plasticity and toughness. The strength of the steel is improved by the solid solution strengthening effect of Cu and Ni, the corrosion resistance of the steel can be improved by Cu, and the low-temperature toughness is mainly improved by adding Ni, and the hot brittleness tendency caused by Cu in the steel is reduced. Aiming at the 4 alloy elements, the invention selects the content ranges of Cr and Ni to be 0.12-0.30 percent, and the content ranges of Cu and Mo to be less than or equal to 0.30 percent.
P, S: is an inevitable impurity element in steel, and the lower the content, the better. The smelting cost cannot be lowered without limit. Therefore, the upper limit of the P, S content is set to 0.010% and 0.005% in the present invention.
The second technical proposal of the invention is to provide a manufacturing method of a steel plate for an NbC nano-particle reinforced X80 plastic pipe, which comprises the steps of preparing materials → converter or electric furnace smelting → external furnace refining → casting → slab reheating → controlled rolling → controlled cooling,
(1) slab reheating: cleaning a steel billet, and then reheating the steel billet, wherein the discharge temperature Tso of the steel billet is 1150-1220 ℃;
(2) controlling rolling: the rough rolling and final rolling temperature Trf is more than or equal to 1000 ℃; the thickness t' of the intermediate temperature-waiting blank is 2.5 t-4.0 t, and t is the thickness of a finished steel plate; the finish rolling start temperature Tfs is 800-900 ℃, and the finish rolling finish temperature Tff is 720-820 ℃;
(3) and (3) controlling cooling: the start cooling temperature Tcs is 720-800 ℃, the end cooling temperature Tcf is 400-600 ℃, and the cooling speed Sc is 15-24 ℃/s, so as to obtain a fine and uniform bainite structure;
(4) performing heat treatment after controlled cooling, and cooling to room temperature by water;
the heat treatment is solid solution treatment and isothermal heat treatment;
solution treatment: putting the steel plate after the controlled cooling into a heating furnace for solution treatment, wherein the temperature Ti of the steel plate before entering the furnace is room temperature-Tcf, the solution temperature Ts1 is 1180-1220 ℃, and the solution treatment time Ts1 is 0.5-2.5 h (h, h); the purpose of the solution treatment is to fully dissolve Nb in austenite to prepare for the subsequent NbC precipitation;
isothermal heat treatment: immediately carrying out isothermal heat treatment after the solution treatment is finished, wherein the isothermal temperature Ts2 is 670-710 ℃, and the isothermal time Ts2 is 0.1-5.0 h (h, h); the purpose of isothermal heat treatment is to make NbC nano-particles fully and uniformly precipitated on a ferrite phase interface;
after the isothermal heat treatment is finished, water is used as a cooling medium to accelerate cooling to room temperature, a ferrite structure is finally obtained, nanometer-sized NbC particles are uniformly distributed on a phase interface, the particle size is not more than 300nm, and the volume fraction is 0.05-0.20%.
In order to meet the performance required by the X80 steel plate for the plastic tube, the invention adopts the component design of low-carbon low-manganese, Nb and Ti composite micro-alloying, selectively adding Mo and Cu, properly adding Cr and Ni and not adding V; the production of the continuous casting billet adopts a pure steel smelting technology and a high-quality slab production technology; the steel plate is produced by adopting a two-stage controlled rolling technology and a controlled cooling and heat treatment technology to obtain a ferrite-based NbC nanoparticle-reinforced microstructure which has good obdurability matching and plastic deformation resistance.
The invention has the beneficial effects that:
(1) the low-carbon equivalent component design of low C and low Mn, composite addition of Cu, Mo, Nb and Ti, no addition of V and selective addition of Ni and Cr effectively reduces the production cost.
(2) The hot rolled steel plate with bainite as a main structure is produced by adopting a TMCP (thermal mechanical control processing) process of two-stage controlled rolling.
(3) After the hot rolled steel plate is subjected to solution treatment and isothermal heat treatment, a ferrite structure with high uniform extension characteristic is obtained; NbC nano-particles are used as a reinforcing phase, so that the steel plate has high yield strength; the heat-treated steel plate cooled to room temperature by water meets the requirements of X80 steel plate for plastic pipe on various mechanical properties, and has particularly good low-temperature toughness and HIC resistance. The invention adopts NbC as a strengthening phase to produce a single-phase structure steel plate, and obtains better comprehensive performance than a double-phase steel plate.
(4) The transverse mechanical property of the steel plate can meet the following requirements: the yield strength Rt0.5 is 470-570 MPa, the tensile strength Rm is 650-750 MPa, the yield ratio Rt0.5/Rm is less than or equal to 0.85, the impact energy CVN at-30 ℃ is more than or equal to 200J, the DWTT shearing area SA at-20 ℃ is more than or equal to 85 percent, and the HV10 is less than or equal to 260; the longitudinal mechanical property of the steel plate can meet the following requirements: rt0.5 is 460-560 MPa, tensile strength Rm is 640-740 MPa, yield ratio Rt0.5/Rm is less than or equal to 0.80, and uniform extension uEL is more than or equal to 10%.
(5) The high cost performance production of the steel plate for the X80 plastic pipe with excellent low-temperature toughness and HIC resistance is realized by matching reasonable component design and process system. The steel pipe manufactured by the steel plate produced by the invention can be used in areas with complex geological conditions, and meets the safety requirements of oil and gas transmission.
Detailed Description
The present invention is further illustrated by the following examples.
According to the component proportion of the technical scheme, the preparation of materials → converter or electric furnace smelting → external refining → casting → slab reheating → controlled rolling → controlled cooling is carried out in the embodiment of the invention;
(1) slab reheating: cleaning a steel billet, and then reheating the steel billet, wherein the discharge temperature Tso of the steel billet is 1150-1220 ℃;
(2) controlling rolling: the rough rolling and final rolling temperature Trf is more than or equal to 1000 ℃; the thickness t' of the intermediate temperature-waiting blank is 2.5 t-4.0 t, and t is the thickness of a finished steel plate; the finish rolling start temperature Tfs is 800-900 ℃, and the finish rolling finish temperature Tff is 720-820 ℃;
(3) and (3) controlling cooling: the start cooling temperature Tcs is 720-800 ℃, the end cooling temperature Tcf is 400-600 ℃, and the cooling speed Sc is 15-24 ℃/s;
(4) performing heat treatment after controlled cooling, and cooling to room temperature by water;
the heat treatment is solid solution treatment and isothermal heat treatment;
solution treatment: putting the steel plate after the controlled cooling into a heating furnace for solution treatment, wherein the temperature Ti of the steel plate before the steel plate enters the furnace is room temperature-Tcf, the solution temperature Ts1 is 1180-1220 ℃, and the solution treatment time Ts1 is 0.5-2.5 h;
isothermal heat treatment: immediately carrying out isothermal heat treatment after the solution treatment is finished, wherein the isothermal temperature Ts2 is 670-710 ℃, and the isothermal time Ts2 is 0.1-5.0 h.
After the isothermal heat treatment is finished, water is used as a cooling medium to accelerate cooling to room temperature, a ferrite structure is finally obtained, nanometer-sized NbC particles are uniformly distributed on a phase interface, the particle size is not more than 300nm, and the volume fraction is 0.05-0.20%.
The compositions of the steels of the examples of the invention are shown in table 1. The main process parameters of the steel of the embodiment of the invention are shown in Table 2. The transverse properties of the steels of the examples of the invention are shown in Table 3. The longitudinal properties and HIC resistance results of the steels of the examples of the present invention are shown in Table 4. The size and volume fraction of NbC nanoparticles in the steel sheet of the example of the invention are shown in Table 5.
TABLE 1 composition (wt%) of steels of examples of the present invention
C* Si Mn Cu Cr Mo Ni Nb N* Ti* Al* P* S*
1 60 0.30 0.60 0 0.12 0 0.12 0.14 1 20 25 9 2
2 80 0.20 0.75 0.28 0.28 0.28 0.28 0.13 2 30 35 6 2
3 100 0.15 0.90 0 0.20 0.10 0.20 0.12 2 30 45 3 4
4 120 0.10 1.15 0.10 0.20 0 0.20 0.11 1 20 35 6 4
5 115 0.14 1.30 0.15 0.15 0.15 0.15 0.10 3 40 25 9 3
6 95 0.23 1.39 0 0.20 0.10 0.20 0.09 4 40 25 5 5
7 75 0.28 1.39 0.10 0.20 0 0.20 0.08 3 40 35 9 2
8 65 0.25 1.25 0.05 0.17 0.05 0.12 0.07 2 30 45 6 2
9 65 0.20 1.20 0.25 0.25 0.25 0.25 0.10 1 20 35 3 4
10 95 0.15 0.95 0.20 0.15 0.15 0.15 0.14 1 10 25 6 4
11 75 0.12 0.80 0.15 0.20 0.15 0.15 0.11 3 40 30 9 3
12 110 0.22 0.65 0.15 0.15 0.15 0.20 0.12 2 20 30 5 5
Note:*indicating that the value is to be multiplied by 10～3
TABLE 2 Main Process parameters of the steels of the examples of the invention
Figure BDA0001788068890000091
Note: RT stands for room temperature.
TABLE 3 transverse Properties of steels of examples of the invention
Rt0.5，MPa Rm，MPa Rt0.5/Rm -30℃CVN，J -20℃DWTT，％ HV10
1 507 680 0.75 240 90 220
2 490 675 0.73 264 90 230
3 508 685 0.74 268 90 215
4 482 680 0.71 256 90 220
5 516 710 0.73 276 95 215
6 520 705 0.74 280 95 230
7 508 690 0.74 257 95 235
8 514 700 0.73 284 95 220
9 508 685 0.74 237 90 215
10 513 685 0.75 231 95 225
11 502 685 0.73 291 90 227
12 483 675 0.72 270 95 223
TABLE 4 longitudinal Properties and HIC resistance results for inventive steels
Rt0.5，MPa Rm，MPa Rt0.5/Rm uEL，％ CLR，％ CTR，％ CSR，％
1 510 710 0.72 10 0 0 0
2 498 695 0.72 11 0 0 0
3 504 705 0.71 11 0 0 0
4 498 690 0.72 10 0 0 0
5 503 705 0.71 12 0 0 0
6 492 680 0.72 10 0 0 0
7 473 665 0.71 11 0 0 0
8 497 685 0.73 11 0 0 0
9 480 660 0.73 10 0 0 0
10 498 700 0.71 12 0 0 0
11 471 660 0.71 10 0 0 0
12 506 700 0.72 11 0 0 0
TABLE 5 NbC nanoparticle size and volume fraction in steel sheets of examples of the invention
Volume fraction of particles% Average size of particles, nm
1 0.14 108
2 0.13 114
3 0.13 118
4 0.12 121
5 0.14 149
6 0.13 146
7 0.10 132
8 0.09 129
9 0.10 113
10 0.16 133
11 0.14 138
12 0.15 143
In order to express the present invention, the above embodiments are properly and fully described by way of examples, and the above embodiments are only used for illustrating the present invention and not for limiting the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made by the persons skilled in the relevant art should be included in the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (1)

1. A steel plate for an NbC nanoparticle reinforced X80 plastic pipe is characterized by comprising the following components in percentage by weight: 0.065 to 0.12 percent of C, 0.10 to 0.30 percent of Si, 0.60 to 1.40 percent of Mn, 0.07 to 0.15 percent of Nb, 0.001 to 0.004 percent of N, 0.01 to 0.04 percent of Ti, 0.025 to 0.045 percent of Al, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Mo, 0.12 to 0.30 percent of Cr, 0.12 to 0.30 percent of Ni, and the balance of Fe and inevitable impurity elements;
the microstructure of the steel plate is ferrite, nano-sized NbC particles are uniformly distributed on a ferrite phase interface, the size of the NbC particles is not more than 300nm, and the volume fraction of the NbC particles is 0.05-0.20%;
the production method of the steel plate comprises the steps of material preparation → converter or electric furnace smelting → external refining → casting → slab reheating → controlled rolling → controlled cooling:
(1) slab reheating: cleaning a steel billet, and then reheating the steel billet, wherein the tapping temperature of the steel billet is 1150-1220 ℃;
(2) controlling rolling: the rough rolling and final rolling temperature is more than or equal to 1000 ℃; the thickness of the intermediate temperature-waiting blank is 2.5 t-4.0 t, and t is the thickness of the finished steel plate; the start rolling temperature of finish rolling is 800-900 ℃, and the finish rolling temperature is 720-820 ℃;
(3) and (3) controlling cooling: the start cooling temperature is 720-800 ℃, the end cooling temperature is 400-600 ℃, and the cooling speed is 15-24 ℃/s;
(4) performing heat treatment after controlled cooling, and cooling to room temperature by water;
the heat treatment is solid solution treatment and isothermal heat treatment;
solution treatment: carrying out solution treatment on the steel plate after the controlled cooling is finished, wherein the temperature of the steel plate before the steel plate is put into a furnace is from room temperature to final cooling temperature, the solution temperature is 1180-1220 ℃, and the solution treatment time is 0.5-2.5 h;
isothermal heat treatment: and immediately carrying out isothermal heat treatment after the solution treatment is finished, wherein the isothermal temperature is 670-710 ℃, and the isothermal time is 0.1-5.0 h.
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