CN113564460A - Low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V and manufacturing method thereof - Google Patents
Low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses a low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V, which comprises the following alloy chemical elements in percentage by weight: 0.03 to 0.06 percent of C, 0.2 to 0.3 percent of Si, 0.80 to 1.05 percent of Mn,0.03-0.06% of Nb, 0.01-0.02% of Ti, a trace amount of Ca or Mg, and the balance of Fe. The invention also discloses a production method which comprises the following steps: clean steel smelting and continuous casting, casting blank heating, three-stage controlled rolling and controlled cooling and ultra-fast cooling in the rolling process. The matrix structure of the steel is granular bainite/acicular ferrite and a small amount of small-size quasi-polygonal ferrite, and the comprehensive rationalization performance of the steel plate is yield Rt0.5450 to 520MPa, tensile strength Rm535-620 MPa, KV2 at-30 ℃ of impact is more than or equal to 280J, DWTT SA at-20 ℃ is more than or equal to 85 percent, HV 10169-190, and the acid-resistant test solution A has good H resistance2S corrosion performance, and meets comprehensive technical requirements of X52MS, X60MS and X65 MS.
Description
Technical Field
The invention relates to the field of production and manufacturing of low-carbon microalloy pipeline steel, in particular to a low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V and a manufacturing method thereof.
Background
The oil-gas resource pipeline steel pipeline transportation is the most economical, safe and efficient mode. With the increasing of human exploitation activities, the difficulty of building pipelines required by energy transportation is gradually increased, and the proportion of pipelines in harsh service environments is increased, such as high-steel-grade pipelines, deep-sea pipelines, corrosion-resistant pipelines, low-temperature pipelines, large-deformation-resistant pipelines and the like. Many oil and gas resources are often rich in H2S and other acidic media, pipeline steel and H in the oil and gas transportation process2S phase contacts and reacts, finally causing the failure of pipeline steel (hydrogen induced cracking (HIC) and hydrogen Sulfide Stress Corrosion Cracking (SSCC)), resulting in larger economic loss and environmental pollution. Aiming at solving the failure mode solving method of the acidic medium conveying pipeline in the acidic environment, acid-resistant pipeline steel is applied, and the current acid-resistant pipeline steel is mainly used for managing H-rich pipelines inland countries2S oil and gas pipelines, seabed acid-resistant pipelines, overseas land acid-resistant pipelines such as the middle east and the like. Acid-resistant line steel having increased wet H content as compared with line steel2The service requirement in the S acid environment is that the probability of Hydrogen Induced Cracking (HIC) and hydrogen Sulfide Stress Corrosion Cracking (SSCC) is increased rapidly, the higher the strength grade of the pipeline steel is, the thicker the thickness specification is, the more serious the caused central component structure segregation is, and the higher the sensitivity of HIC and SSCC is.
In the development process of the acid-resistant pipeline steel, three technical difficulties mainly exist. Firstly, the purity of molten steel is extremely high, and during the corrosion process of hydrogen sulfide, because hydrogen atoms are easy to gather and form cracks on a two-phase interface, the higher the purity of the molten steel is, the better the molten steel is. Secondly, for the requirement of mechanical property of a certain obdurability acid-resistant pipeline, a plurality of alloy elements such as alloy strengthening element C, Mn and the like must be added, the higher the alloy elements are, the more serious the component segregation is, the uneven structure caused by the component segregation and the hydrogen induced crack easily caused by the banded segregation structure. Thirdly, for thick pipelines, the deformation in the thickness direction in the rolling process is greatly different, the deformation is difficult to penetrate to the center, the temperature gradient and the cooling speed difference in the cooling process are also large, the tissue uniformity is difficult to control, and the tissue uniformity in the thickness direction is extremely difficult to obtain particularly under the conditions of rapid rolling and rapid cooling of hot continuous rolling TMCP.
Through literature search, relevant patent 17 is searched, and patent CN 106566991A discloses X65MOS acid-resistant submarine pipeline steel and a preparation method thereof, wherein the chemical composition is C: 0.03-0.045%, Si: 0.15 to 0.23%, Mn: 1.2-1.35%, Ni 0.2-0.4%, Cr: 0.2-0.3%, and the like, wherein the steel plate compression ratio is not less than 11 during preparation, the billet is heated in a furnace for 380-460 min, and the thickness of the prepared steel plate is 34-48 mm after rough rolling, finish rolling, water cooling and stack cooling.
CN 105132807A discloses a pipeline steel with excellent acid corrosion resistance on the seabed, which comprises the following chemical components: 0.020-0.050% of C, 0.10-0.30% of Si, 0.50-1.10% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0-0.20% of Cu, 0-0.30% of Cr, 0-0.20% of Ni, 0-0.25% of Mo, 0.030-0.055% of Nb, 0.020-0.050% of V, 0.010-0.025% of Ti, 0.010-0.050% of Al and less than or equal to 0.008% of N; the production steps are as follows: heating after continuous casting and blank forming; rough rolling; fine rolling; cooling; coiling; cooling to room temperature; can obtain ideal superfine crystal polygonal ferriteComplex phase organization of body and a small amount of dispersed MA component to realize Rt0.5≥485MPa，RmMore than or equal to 570MPa, KV2 more than or equal to 250J at minus 20 ℃, and DWTT SA more than or equal to 85 percent at minus 15 ℃. HIC and SSCC test, without any cracking or crazing. The patent adopts two stages of rough rolling and finish rolling, the accumulated reduction rate is not lower than 70%, and the continuous casting billets with the thickness of 250mm and below can only be used for producing seabed acid-resistant pipelines with the thickness of below 23mm and cannot be used for producing seabed acid-resistant pipelines with the ultra-thick specification of 25mm and above.
CN 108624811A discloses a large thick-wall acid corrosion resistant pipeline steel and a production method thereof, and the steel comprises the following chemical components: 0.01-0.02% of C, 0.10-0.35% of Si, 0.9-1.4% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0010% of S, 0.10-0.30% of Cr, less than or equal to 0.30% of Ni, 0.10-0.30% of Mo0.10, 0.10-0.30% of Cu0.02-0.07% of Nb, 0.006-0.020% of Ti, 0.015-0.050% of Al, and Ca: 0.0005 to 0.004%; the steel plate is rolled by adopting a TMCP (thermal mechanical control processing) process, and is cooled to 280-300 ℃ in an ultra-fast cooling mode to obtain a polygonal and bainite structure with the core part of 30 mu m, so that the requirement on acid corrosion resistance can be met, but the mechanical property and the steel plate thickness specification are not published, the content of a strengthening element C is considered to be low, the size of polygonal ferrite is considered to be large, and the strength grade is not expected to be high.
CN111254352A discloses X65MS acid-resistant pipeline steel, which comprises the following components: 0.03-0.05%, Si less than or equal to 0.15%, Mn: 1.25-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.0015%, Alt: 0.020-0.040%, Ti: 0.010% -0.020%, Nb: 0.040% -0.050%, Cr: 0.20-0.25%, Ni: 0.10-0.20 percent of the total Ca/S ratio, less than or equal to 0.0020 percent of O, less than or equal to 0.0040 percent of N and more than or equal to 1.5 percent of Ca; the balance of Fe and inevitable trace elements, Mo, V and Cu are not adopted in the process, the production cost is low, the adopted process can also avoid the occurrence of banded structures and reduce the hardness of a segregation zone, and the HIC (stress corrosion cracking) resistance and SCC (stress corrosion cracking) resistance of the pipeline steel are improved.
CN110846565A discloses a low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance, which comprises the following components: 0.03-0.08 percent of Si, 0.15-0.20 percent of Si, 1.05-1.15 percent of Mn, less than 0.01 percent of P, less than 0.002 percent of S, 0.025-0.035 percent of Nb0.015-0.025 percent of Ti, less than 0.05 percent of Al, less than 0.006 percent of Ca, and the balance of Fe and inevitable trace impurities. The production method comprises the working procedures of steel making, continuous casting, rolling, coiling and cooling; and (3) a rolling procedure, wherein the outlet temperature of the final pass of rough rolling is 1015-1050 ℃. The invention reduces the segregation of C and the generation of pearlite through the optimal C content; the mixed crystal of the structure is reduced through controlled rolling and controlled cooling, the uniformity of the structure along the thickness direction is realized, and finally, the stability of the structure and the performance of the low-cost large-wall-thickness acid-resistant pipeline steel is realized.
CN109811257A discloses a deep sea acid-resistant pipeline steel, which relates to the technical field of metallurgy and comprises the following chemical components in percentage by mass: c: 0.020% -0.040%, Si: 0.30-0.40%, Mn: 1.00-1.20%, P is less than or equal to 0.010%, S is less than or equal to 0.0010%, Nb: 0.030-0.040%, Ti: 0.010% -0.030%, Ni: 0.20-0.30%, Cr: 0.10% -0.30%, Mo: 0.10-0.20%, Cu is less than or equal to 0.010%, V is less than or equal to 0.010%, Al: 0.015% -0.050%, Ceq: 0.25-0.38%, Pcm: 0.10 to 0.17 percent, and the balance of Fe and impurities. The invention scientifically designs the components of the product, and develops the deep-sea acid-resistant pipeline steel and the smelting process by adopting a unique manufacturing process.
CN108893677A discloses an acid-resistant pipeline steel and a production method thereof, relating to the field of metallurgy, wherein the acid-resistant pipeline steel comprises the following chemical components in percentage by mass: c: 0.014% -0.024%, Si: 0.10-0.35%, Mn: 0.60-0.80%, P is less than or equal to 0.012%, S is less than or equal to 0.0010%, Nb: 0.030-0.070%, Ti: 0.006% -0.020%, Ni: 0.10-0.30%, Cr: 1.00% -1.10%, Mo: 0.15-0.20%, Cu: 0.10% -0.30%, V: 0.010%, Al: 0.015-0.050% and the balance of Fe and impurities. The invention carries out unique component design on the acid-resistant pipeline steel, adopts a unique production method, and meets the requirements of the steel plate on design and acid-resistant and corrosion-resistant properties.
CN111270137A discloses an acid corrosion resistant pipeline steel X52MS hot-rolled coil, which comprises the following components in percentage by weight: 0.03-0.10% of C, 0.45-0.80% of Mn, 0.10-0.30% of Si, 0.010-0.050% of Al, 0.25-0.40% of Cr, 0.015-0.035% of Ti, less than or equal to 0.012% of P, less than or equal to 0.0050% of S, less than or equal to 0.0060% of N, less than or equal to 0.0040% of O, 0.030-0.065% of Nb, 0.015-0.045% of V, and the balance of Fe and inevitable impurities. The invention also discloses a preparation method of the X52MS hot-rolled coil, which greatly improves the production efficiency of the pipeline steel, reduces the energy consumption and the production cost, prolongs the service life and is beneficial to meeting the requirements of social development.
CN108411194A discloses acid corrosion resistant X60MS pipeline steel, which comprises the following components in percentage by weight: c: 0.05 to 0.07%, Si: 0.10 to 0.20%, Mn: 0.90-1.10%, P: less than or equal to 0.010 percent, S: less than or equal to 0.002%, Nb: 0.020 to 0.030%, Ti: 0.010-0.020%, Al: 0.020-0.040%, Cr: 0.20 to 0.30 percent. The invention also discloses a preparation method of the acid corrosion resistant X60MS pipeline steel. The acid corrosion resistant X60MS pipeline steel and the preparation method thereof improve the weldability, HIC resistance and drop hammer tear resistance of the pipeline steel.
CN109594015A discloses acid corrosion resistant X70MS pipeline steel, which comprises the following chemical components in percentage by weight: 0.04-0.06%, Si: 0.10 to 0.20%, Mn: 1.301.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.002%, Nb: 0.040-0.050%, Ti: 0.010-0.020%, Al: 0.020-0.050%, Cr: 0.15-0.30%, Cu: 0.10 to 0.20%, Ni: 0.10-0.20%, H: 2ppm or less, O: less than or equal to 25ppm, N: less than or equal to 40ppm, Pcm: less than or equal to 0.20 percent. The invention also discloses a preparation method thereof, and the X70MS pipeline steel with high strength, high toughness, drop hammer tear performance, low cost and acid corrosion resistance is obtained.
CN109735769A discloses a B-grade acid-resistant pipeline steel plate and a pipe manufacturing method, and the steel plate comprises the following chemical components in percentage by mass: c: 0.010-0.040%, Si: 0.10-0.30%, Mn: 0.80-0.90%, P is less than or equal to 0.015%, S is less than or equal to 0.0010%, Ni: 0.10-0.20%, Cu: 0.10% -0.20%, Nb: 0.020% -0.040%, Mo: 0.08-0.15%, Ti: 0.01-0.02%, Ca: 0.001-0.003%, Al: 0.01 to 0.04 percent, and the balance of Fe and inevitable impurities. The invention adopts a unique component design, and the steel pipe is manufactured through the working procedures of edge milling, pre-bending, forming, welding, flaw detection, expanding, hydrostatic test and the like, thereby realizing the requirement of the steel pipe of the B-grade acid-resistant pipeline.
CN103667875B discloses a preparation method of low-carbon acid-resistant pipeline steel, which comprises the following steps: pre-desulfurizing the molten iron, and then carrying out slagging-off treatment to obtain molten iron with the sulfur content of less than or equal to 0.001%; smelting the molten iron with the sulfur content of less than or equal to 0.001% by a dephosphorization converter to obtain semisteel with the C of more than or equal to 3.3%, the P of less than or equal to 0.040% and the temperature T of more than or equal to 1320 ℃; smelting the semi-molten steel in a decarburization furnace to obtain molten steel with the C content of 0.015 percent and 0.025 percent; heating the molten steel in an LF furnace, desulfurizing, adjusting components, and controlling the carbon content in the molten steel to be less than or equal to 50 ppm; and carrying out deep degassing treatment on the molten steel with the carbon pick-up controlled to be less than or equal to 50ppm by an RH refining process, and then carrying out continuous casting to obtain a plate blank. According to the preparation method of the low-carbon acid-resistant pipeline steel, provided by the invention, the smelting process is optimized, so that the production consumption is reduced, and the production cost is saved.
CN109280732A discloses a high-purity acid-resistant pipeline steel smelting process, which relates to the technical field of metallurgy and comprises molten iron pouring → molten iron pretreatment → converter high-carbon low-oxygen retention operation → RH furnace vacuum decarburization → RH furnace alloying and vacuum degassing → LF refining furnace anti-recarburization rapid desulfurization process → CCM flow, through molten iron desulfurization and slagging, optimization of converter tapping oxygen retention system and slagging system, RH furnace vacuum decarburization and alloying process, LF furnace diffusion deoxidation and precipitation deoxidation, reasonable ladle argon bottom blowing control in the whole smelting process, full play of metallurgy and kinetic conditions of carbon content control and desulfurization, anti-recarburization rapid desulfurization process, LF furnace slagging desulfurization effect is obvious, and molten steel purity is high, casting blank quality is good, inclusion content within 1.5 level of steel plate is controlled to be more than 99%.
CN 102676744A discloses a process for producing acid-resistant pipeline steel by VD-LF-VD refining, which utilizes converter rough smelting and RH-LF-RH refining processes to control molten steel components and produce low-carbon and low-sulfur acid-resistant (anti-HIC and SCC) pipeline steel. The specific process flow is as follows: the method comprises the following steps of molten iron pre-desulfurization, converter smelting, first VD vacuum refining, LF refining desulfurization, second VD vacuum refining and continuous casting. The invention utilizes the secondary VD vacuum refining process, can reduce the decarburization burden of the converter, reduce the oxidability of the molten steel, eliminate the adverse effect of recarburization in the refining process of the LF furnace, reduce the use of strong deoxidizers, stabilize the production, ensure the stable control of the components of the molten steel within production targets, and meet the requirements of the acid-resistant pipeline steel on the control of the components of low carbon, low sulfur and high purity. The carbon content of the finished steel produced by the process flow can be stably controlled to be 0.03-0.04%, and the sulfur content can be stably controlled to be less than or equal to 0.0010%.
CN109158557A discloses a method for producing an acid-resistant and corrosion-resistant pipeline steel slab by a chamfering crystallizer continuous casting machine, which comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment and continuous casting; in the continuous casting process, the chamfer angle of the crystallizer is 44.95-45.05 degrees, the chamfer width is 39.90-40.10 mm, the flow rate of cooling water in a water tank of the chamfer crystallizer copper plate is 6.5-7.0 m/s, the water quantity of the narrow surface of the chamfer crystallizer is 560-570L/min, and the water quantity of the wide surface is 4300-4400L/min. The invention adopts the design of low carbon, ultra-low phosphorus and sulfur and low manganese content, adopts the duplex process and the pure argon blowing after calcium treatment, and controls the inclusion; the cooling parameters of the crystallizer and the soft reduction and reduction mode of the sector section are designed, so that the center segregation of the casting blank is reduced, the formation of MnS inclusions is reduced, and a banded structure is eliminated or lightened, thereby improving the acid and corrosion resistance of the product.
CN107099747B discloses a production process for controlling acid-resistant pipeline steel large inclusions, which reasonably designs the components by carrying out system analysis on the control mechanism of the pipeline steel inclusions in the BOF → RH → LF production process, wherein the pipeline steel components are as follows by weight percent: c: 0.02 to 0.04%, Si: 0.10 to 0.30%, Mn: 1.00-1.30%, P is less than or equal to 0.013%, S is less than or equal to 0.0010%, Nb: 0.030-0.070%, Ti: 0.006-0.020%, Ni: 0.10-0.30%, Cr: 0.10-0.30%, Cu: 0.10-0.30%, Al: 0.015-0.050%, and the balance of Fe; the sulfur content in the molten steel before calcium treatment is ensured to be less than 10ppm, and the calcium treatment is quantified after the LF is finished, so that the aim of improving the purity of the molten steel is fulfilled, the internal quality of steel is improved, and the economic benefit is improved.
CN 102676725A discloses a method for controlling non-metallic inclusions in X70-grade acid-resistant pipeline steel, which controls the type, quantity and size of the non-metallic inclusions in a rolled plate by controlling the content of molten steel and ensuring a proper Ca/S ratio (1.2-5.0). Controlling the inclusion in the steel plate to CaO +And (2) CaS: 85-90%, and others: less than or equal to 10 percent, and has the characteristic of difficult deformation in the rolling process; the number and size of inclusions are significantly reduced by the long refining process. The X70 steel plate manufactured by the method meets the requirements of various indexes (crack length rate is less than or equal to 15 percent, crack thickness rate is less than or equal to 5 percent and crack sensitivity rate is less than or equal to 2 percent) of HIC in the solution A HIC test, and large-size strip MnS and strip string CaO-Al are avoided2O3The type B inclusions are used for resisting the harm of acid pipeline steel.
Through the reference of relevant documents at home and abroad, the report which is completely the same as the invention is not found.
Based on the situation, the invention provides a low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V and a manufacturing method thereof, and the problems can be effectively solved.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the technical difficulty of the traditional acid-resistant pipeline steel plate coil, the invention adopts elements such as Cu, Cr, Ni and the like to improve the corrosion resistance, and adopts low-carbon microalloying strengthening elements such as Mo, Nb and V to improve the toughness, so that the traditional acid-resistant pipeline steel has more alloy elements. The invention successfully develops and produces X52, X60MS and X65MS series acid-resistant pipeline steel by adopting a low-cost, low-C and low-Mn component design without Cu, Cr, Ni, Mo and V, pure steel hazard element control, Ca or Mg inclusion treatment modification smelting process control and a TMCP hot continuous rolling process.
In order to solve the technical problems, the invention is realized by the following technical scheme:
on one hand, the invention provides a low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V, which comprises the following chemical components in percentage by weight: c: 0.03-0.06%, Si: 0.2-0.3%, Mn: 0.80-1.05%, Nb: 0.03-0.06%, Ti: 0.01 to 0.02 percent of the total weight of the alloy, trace Ca or Mg, and the balance of Fe, and the rest alloy elements are residual alloy elements which are not added intentionally.
The component system adopts low-carbon-medium-low-manganese components to be matched with Nb microalloying, and reduces the content of Mn in steel to be 0.8-1.05% and the content of S in steel to be less than 0.002% by adjusting the content of Mn in steel to be a certain range, so that the content of easily segregated components C, Mn and S is reduced, and the HIC and SSCC resistance of steel is improved. And the problem of insufficient steel matrix strength caused by low carbon and medium and low manganese contents is solved by adding Nb alloy elements to improve the precipitation strength of steel and make up for the problem of insufficient strength caused by low carbon and medium and low manganese contents.
Preferably, the thickness specification of the acid-resistant pipeline steel plate coil can completely meet the pipeline steel with the thickness less than or equal to 25.4mm, the mechanical property of the acid-resistant pipeline steel plate coil completely meets the comprehensive technical requirements of X52MS, X60MS and X65MS, and the Nb content of the X70-grade acid-resistant pipeline steel is 0.04-0.06%.
On the other hand, the invention also provides a method for manufacturing the low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V, which comprises the following steps:
s1, smelting: according to the requirement of the acid-resistant pipeline steel hot-rolled plate coil on the chemical component weight percentage, firstly, the content of harmful elements in steel is controlled by adopting a clean steel smelting technology, and then the type and the size of inclusions existing in molten steel are controlled by adopting an inclusion modification technology;
s2, casting: in the casting process, the size precision of the casting blank is controlled to prevent bulging, the segregation of the continuous casting blank is improved under dynamic soft reduction, and the low-power rating of the casting blank is controlled within C1.0 level;
s3, heating and heat preservation: controlling the heating temperature and the heat preservation time of the heating furnace;
s4, hot rolling stage: firstly, two-stage low-temperature rough rolling is adopted to realize high-penetration rolling of a full-thickness section; then, a section of low-temperature finish rolling is carried out to inhibit the growth tendency of crystal grains and refine a finish rolling structure;
s5, cooling and forming: and accelerating cooling after finish rolling is finished, ensuring the start cooling temperature to be 760-810 ℃, obtaining a uniform bainite/acicular ferrite + ferrite structure, wherein the cooling rate of the accelerating cooling is 10-25 ℃/s, and the final cooling temperature is designed to be 350-550 ℃.
Preferably, in step S1, the harmful elements N is controlled to be less than or equal to 0.0050%, H is controlled to be less than or equal to 0.0002%, O is controlled to be less than or equal to 0.0025%, P is controlled to be less than or equal to 0.015%, and S is controlled to be less than or equal to 0.0020%.
Further preferably, in the step S1, the inclusion modification technology may adopt a Ca treatment process or a Mg treatment process, the Ca/S ratio in the total molten steel in the Ca treatment process is controlled to be 1.5-3.0, and the soft blowing time after the calcium treatment is not less than 4 min; the Mg content in the Mg treatment process is controlled according to 0.0002-0.0022 percent.
Preferably, in the step S2, the casting superheat degree is controlled at 10 to 25 ℃, casting is performed at a constant speed, the centering of the sector support guide roll is maintained, the roll gap distance is reduced, and the roll gap state of the casting machine is periodically checked and adjusted.
Preferably, in step S2, the axial crystal ratio is advantageously increased by electromagnetic stirring, and the segregation grade of the cast slab is improved.
Preferably, in the step S3, the heating temperature of the heating furnace is controlled to be 1150-1200 ℃; according to different charging temperatures, the in-furnace time is 160-260 min, and the heat preservation time at the high temperature of 1150-1180 ℃ is 60-100 min.
Preferably, in the step S4, in the first stage, 1-pass heavy-deformation rolling is performed in the austenite region at a temperature of 1050 ℃ or higher, with a pass reduction of 10 to 15%; in the second stage, 5-7 times of large-deformation rolling is adopted within the temperature range of 950-1050 ℃, the reduction rate of each time is more than 10%, the cumulative reduction rate of rough rolling is 57%, and the thickness of the intermediate blank after rough rolling is 50-70 mm; the third stage is a finish rolling stage, wherein the finish rolling initial rolling temperature is set to be less than or equal to 950 ℃, the austenite non-recrystallization zone is rolled, the reduction rate of each pass is greater than 10%, the finish rolling accumulated reduction rate is 60%, and the finish rolling temperature is 810-.
Further preferably, the surface is cooled by water spraying in the rough rolling process, the cooling gradient from the surface to the core of the casting blank is adjusted, the easy segregation structure and the coarse structure of the core are reduced, and the high-permeability rolling of the full-thickness section is realized.
The selection of the smelting components of the invention is illustrated as follows:
c: carbon is a cheap and effective strengthening element, and carbon is a main element influencing the toughness and weldability of pipeline steel. The increase of carbon content, deterioration of weldability, decrease of toughness, and at the same time, the aggravation of segregation and decrease of HIC resistance. With the improvement of the strength grade of the steel, the content of C in the pipeline steel is in a descending trend, so the invention controls the content of C to be 0.03-0.07%.
Si: si is dissolved in steel in a solid state and acts as solid solution strengthening, and Si can reduce the solubility of carbon in austenite in steel. Si element strongly inhibits carbide from being precipitated along grain boundaries in the bainite transformation process, increases the grain boundary binding force and improves the toughness. When the content of silicon is too high, the plasticity and toughness of the material are obviously reduced, and the weldability of the steel is also reduced, so in order to avoid the obvious deterioration of the plasticity and toughness of the steel caused by adding excessive silicon, the content of Si is controlled to be in the range of 0.20-0.30 percent.
Mn: mn is a basic alloy element of HSLA steel for pipeline. The main role of manganese in steel is four: (1) the gamma → alpha phase transition temperature is reduced, the austenite phase transition is delayed, the pearlite amount is reduced, the ferrite grain size is refined, and the acicular ferrite nucleation can be promoted by high Mn; (2) the solubility product of Nb (C, N) in austenite is improved, the early precipitation tendency of Nb in austenite is reduced, the size of precipitated carbide is reduced, and the precipitation strengthening effect is promoted; (3) an inherent beneficial effect on toughness. (4) When the Mn content in steel is excessively increased, component segregation is easily caused, a pearlite strip is formed in the center of the plate thickness, when a banded structure is larger than or equal to 2%, acid-resistant HIC and SSCC experiments cannot be generally passed, Mn and S in the steel form easy MnS inclusions, and the segregation and MnS inclusions easily cause Hydrogen Induced Cracking (HIC) and stress corrosion cracking (SSCC) in the service environment of the acid-resistant submarine pipeline at the seabed, and the acid-resistant submarine pipeline generally reduces the manganese content in the steel on the basis of the same steel grade pipeline steel, so that the Mn addition amount is generally controlled to be 0.80-1.05%.
P, S: phosphorus tends to segregate in the steel for pipe lines, and it also deteriorates weldability, significantly lowers the low-temperature impact toughness of the steel, and raises the brittle transition temperature. Sulfur is a main element influencing the HIC and SSC resistance of the pipeline steel, is easy to combine with manganese to generate MnS inclusions, and also influences the low-temperature impact toughness of the pipeline steel. Therefore, the pipeline steel should minimize the adverse effect of the P, S element on the properties of the steel. The P content is controlled below 0.015 percent, the S content is controlled below 0.002 percent, and the adverse effects of spheroidizing and uniformly distributing inclusions in steel are reduced by applying the techniques of inclusion modification treatment and the like.
Nb: because niobium can obviously improve the recrystallization temperature of steel, the high Nb content can ensure that the high austenite recrystallization temperature is obtained, thereby obtaining a fine structure containing a large amount of deformation zones. Meanwhile, after Nb reaches a certain content in microalloy controlled rolling steel, the fine Nb (C, N) particle precipitation strengthening can be separated out in the rolling and cooling process, thereby improving the strength of the steel. Therefore, the content of Nb is controlled to be 0.03-0.06 percent in the invention.
Ti: in the controlled rolling low-carbon pipeline steel, 0.02 percent of titanium is added to refine grains, so that the yield strength and the toughness of the steel are improved. This improvement is mainly related to the fact that titanium increases the recrystallization temperature and austenite grain coarsening temperature of the steel, thereby controlling the grain size during continuous casting and heating. Meanwhile, the addition of Ti into Nb steel can prolong the precipitation incubation period of NbC, so that the precipitation starting time of carbide of the Nb-Ti composite steel is later than that of the Nb steel, and precipitates are finer and more dispersed. Since Ti can combine with N at high temperature to form TiN particles, the addition of Ti is advantageous for grain control in the heat affected zone during welding, which is also very advantageous for improving the toughness of the weld heat affected zone. Therefore, the invention controls the Ti content to be 0.01-0.02%.
Al: al is a main deoxidizing element in steel, can remarkably reduce the oxygen content in the steel, and can effectively refine grains by combining aluminum and nitrogen to form AlN. However, when the content of aluminum in the steel exceeds a certain amount, the content of aluminum oxide inclusions is easily increased obviously, the cleanliness of the steel is reduced, and the toughness is not favorable, so that the content of Als is generally controlled to be 0.01-0.045%.
The invention contains the chemical components and the balance of Fe and inevitable impurities.
Compared with the prior art, the low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V has the following advantages:
the invention adopts reasonable component design and production process control, and adopts a low-cost MnNb component system without Cu, Cr, Ni, Mo and V in component to realize the production of the acid-resistant pipeline steel hot-rolled plate coil; the concrete components are as follows: c: 0.03-0.06%, Si: 0.2-0.3%, Mn: 0.80-1.05%, Nb: 0.03 to 0.06%, Ti: 0.015-0.025 percent of the total weight of the alloy, trace Ca or Mg and the rest alloy elements are all residual alloy elements which are not added.
In the process, a BOF-LF-RH-CC process is adopted to realize low-level control of the harmful element P, S, O, H, and after RH vacuum treatment, inclusion refining pellet treatment is carried out on low-oxygen low-sulfur molten steel to realize small-size distribution of inclusion dispersion pellets; in the continuous casting process, low superheat pouring temperature control is adopted, and low segregation high-quality casting blanks are realized by dynamic soft reduction and accurate casting blank reduction control. In the heating rolling process, the original austenite grain size is controlled by adopting low-temperature heating, the surface is cooled by spraying water in the rough rolling process, the cooling gradient from the surface to the core of a casting blank is adjusted, the easy segregation structure and the coarse structure of the core are reduced, and the high-permeability rolling of the full-thickness section is realized. The finish rolling process is carried out at low temperature, the growth tendency of crystal grains is inhibited, the finish rolling structure is refined, the finish rolling structure is rapidly cooled after rolling, the transformation of ferrite to granular ferrite is promoted, the proportion of small-size ferrite in the structure is improved, the structure strengthening target is realized, and various index requirements of an HIC A solution acid-resistant test can be completely met.
Drawings
FIG. 1 is a metallographic structure diagram of the rolled center 1/2 of the acid-resistant pipeline steel.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
The invention is described in further detail below with reference to fig. 1 and the specific examples.
The values of the chemical components and the weight percentage content in the embodiments 1-10 of the invention are shown in table 1.
The values of the rolling and cooling temperatures of the preparation processes of examples 1 to 10 of the present invention are shown in table 2.
The tables of the mechanical property test conditions of the examples 1 to 10 of the present invention are shown in Table 3.
The invention relates to a method for manufacturing a low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V, which carries out specific implementation steps by using acid-resistant pipeline steel with the thickness of 12-25.4mm, and comprises the following process flows: blast furnace molten iron → molten iron desulphurization → converter top and bottom combined blowing → argon blowing → LF furnace → RH (Si-Ca/Mg line) treatment → continuous casting → heating of casting blank delivery → hot continuous rolling of rolling mill → controlled cooling → coiling → finishing (leveling); the method comprises the following steps:
(1) and (3) molten iron is pretreated, desulfurization is carried out through a KR desulfurization station, the terminal point [ S ] is less than or equal to 0.0050%, and the slag skimming requirement reaches a point of 0%.
(2) And blowing oxygen for decarburization in the converter, and removing P in the molten steel by utilizing the strong oxidizing atmosphere of the converter, wherein the end point P is less than or equal to 0.015 percent.
(3) LF ladle refining is carried out, white slag making operation is carried out, the oxygen content in steel slag and molten steel is reduced, high-alkalinity slag is used for removing the S content in the steel to be less than or equal to 0.0020%, and Nb alloying operation is carried out.
(4) The RH treatment time is more than or equal to 12 min; the cycle time is more than or equal to 5min after the alloy is added, Ti-Fe is added according to the target composition, the chemical composition fine adjustment is carried out on each element according to the target composition requirement, and the composition is within the internal control range after the vacuum is finished.
(5) Ca/S in the calcium-treated molten steel is controlled to be 1.5-3.0 percent or treated by adopting Mg wire (Mg alloy), the content of Mg is controlled to be 0.0002-0.0022 percent, and the soft blowing time after treatment is not less than 4 min.
(6) The superheat degree is controlled to be 10-25 ℃ during casting, constant-speed casting is carried out, centering of a fan-shaped section supporting guide roller is kept, the distance between the rollers is reduced, the roll gap state of a casting machine is periodically checked and adjusted, the size precision of a casting blank is controlled to prevent bulging, continuous casting blank segregation is improved under dynamic soft reduction, the low-power rating of the casting blank is controlled to be within C1.0 level, and when the condition is met, the adoption of electromagnetic stirring is beneficial to improving the axial crystal proportion and improving the segregation level of the casting blank.
(7) And heating and preserving heat by using a heating furnace. The heating temperature is 1150-1200 ℃; according to different charging temperatures, the in-furnace time is 160-260 min, and the heat preservation time at the high temperature of 1150-1180 ℃ is 60-100 min.
(8) And (4) hot rolling for three stages. In the first stage, 1-pass large deformation rolling is carried out in an austenite region at a high temperature of above 1050 ℃, and the pass reduction rate is 10-15%; in the second stage, 5-7 times of large-deformation rolling is adopted within the temperature range of 950-1050 ℃, the reduction rate of each time is more than 10%, the cumulative reduction rate of rough rolling is 57%, and the thickness of the intermediate blank after rough rolling is 50-70 mm; and (3) water is sprayed on the surface for cooling in the rough rolling process, the cooling gradient from the surface to the core of the casting blank is adjusted, the easy segregation structure and the coarse structure of the core are reduced, and the high-permeability rolling of the full-thickness section is realized. The third stage is a finish rolling stage, wherein the finish rolling initial rolling temperature is set to be less than or equal to 950 ℃, the austenite non-recrystallization zone is rolled, the reduction rate of each pass is greater than 10%, the finish rolling accumulated reduction rate is 60%, and the finish rolling temperature is 810-.
(9) After finishing the finish rolling, accelerating cooling, ensuring the start-cooling temperature to be 760-810 ℃, obtaining a uniform bainite/acicular ferrite + ferrite structure, wherein the start-cooling temperature cannot be lower than 760 ℃, preventing the proportion of large-size ferrite in the structure from being greatly increased, the cooling rate of the accelerating cooling is 10-25 ℃/s, the finish cooling temperature is designed to be 350-550 ℃, controlling the temperature fluctuation of the whole plate in the width direction to be less than or equal to 30 ℃, and preventing the anisotropy of longitudinal and transverse mechanical properties.
Table 1 is a table of the chemical components and weight percentages of each example of the invention
| Elemental composition | C | Si | Mn | P | S | Nb | Al | Ti | Ca | Mg |
| Example 1 | 0.030 | 0.25 | 1.05 | 0.011 | 0.0010 | 0.032 | 0.045 | 0.018 | 0.0022 | - |
| Example 2 | 0.044 | 0.25 | 1.03 | 0.012 | 0.0008 | 0.033 | 0.035 | 0.017 | 0.0018 | - |
| Example 3 | 0.050 | 0.23 | 0.95 | 0.011 | 0.0009 | 0.035 | 0.033 | 0.015 | 0.0020 | - |
| Example 4 | 0.046 | 0.20 | 0.90 | 0.013 | 0.0010 | 0.030 | 0.034 | 0.011 | 0.0021 | - |
| Example 5 | 0.045 | 0.30 | 0.80 | 0.012 | 0.0009 | 0.033 | 0.019 | 0.018 | 0.0023 | - |
TABLE 1 tabulated chemical compositions and weight percents of the examples of the present invention
| Elemental composition | C | Si | Mn | P | S | Nb | Al | Ti | Ca | Mg |
| Example 6 | 0.047 | 0.21 | 1.03 | 0.010 | 0.0010 | 0.045 | 0.040 | 0.020 | - | 0.0018 |
| Example 7 | 0.044 | 0.24 | 1.05 | 0.009 | 0.0009 | 0.043 | 0.036 | 0.016 | - | 0.0022 |
| Example 8 | 0.054 | 0.28 | 0.95 | 0.009 | 0.0009 | 0.055 | 0.030 | 0.015 | - | 0.0002 |
| Example 9 | 0.055 | 0.20 | 0.94 | 0.013 | 0.0010 | 0.060 | 0.024 | 0.010 | - | 0.0010 |
| Example 10 | 0.060 | 0.30 | 0.91 | 0.013 | 0.0008 | 0.053 | 0.010 | 0.018 | - | 0.0015 |
Table 2 is a table of rolling and cooling temperatures for the manufacturing process of various embodiments of the present invention
Table 3 is a list of performance testing scenarios for various embodiments of the present invention
As can be seen from the physicochemical property data of examples 1 to 10, the yield Rt can be achieved0.5450 to 500MPa, tensile strength Rm535-600 MPa, KV2 at-30 ℃ of impact is more than or equal to 280J, DWTT SA at-20 ℃ is more than or equal to 85 percent, HV 10169-190, 10 groups of embodiments can completely meet the technical index requirements of X52MS, X60MS and X65MS, and the steel has H resistance2And S has good corrosion performance. The representative microscopic metallographic structure is shown in figure 1, and the structure type is small-size quasi-polygonal ferrite + bainite/acicular ferrite.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V is characterized in that: the acid-resistant pipeline steel hot-rolled plate coil comprises the following chemical components in percentage by weight: c: 0.03-0.06%, Si: 0.2-0.3%, Mn: 0.80-1.05%, Nb: 0.03-0.06%, Ti: 0.01 to 0.02 percent of the total weight of the alloy, trace Ca or Mg, and the balance of Fe, and the rest alloy elements are residual alloy elements which are not added intentionally.
2. The low-cost MnNb series acid-resistant pipe steel hot-rolled plate coil free of Cu, Cr, Ni, Mo and V according to claim 1, characterized in that: the thickness specification of the acid-resistant pipeline steel plate coil can completely meet the pipeline steel with the thickness less than or equal to 25.4mm, the mechanical property of the acid-resistant pipeline steel plate coil can completely meet the comprehensive technical requirements of X52MS, X60MS and X65MS, and the Nb content of the X70-grade acid-resistant pipeline steel is 0.04-0.06%.
3. A method for manufacturing a low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V is characterized by comprising the following steps:
s1, smelting: according to the requirement of the acid-resistant pipeline steel hot-rolled plate coil on the chemical component weight percentage, firstly, the content of harmful elements in steel is controlled by adopting a clean steel smelting technology, and then the type and the size of inclusions existing in molten steel are controlled by adopting an inclusion modification technology;
s2, casting: in the casting process, the size precision of the casting blank is controlled to prevent bulging, the segregation of the continuous casting blank is improved under dynamic soft reduction, and the low-power rating of the casting blank is controlled within C1.0 level;
s3, heating and heat preservation: controlling the heating temperature and the heat preservation time of the heating furnace;
s4, hot rolling stage: firstly, two-stage low-temperature rough rolling is adopted to realize high-penetration rolling of a full-thickness section; then, a section of low-temperature finish rolling is carried out to inhibit the growth tendency of crystal grains and refine a finish rolling structure;
s5, cooling and forming: and accelerating cooling after finish rolling is finished, ensuring the start cooling temperature to be 760-810 ℃, obtaining a uniform bainite/acicular ferrite + ferrite structure, wherein the cooling rate of the accelerating cooling is 10-25 ℃/s, and the final cooling temperature is designed to be 350-550 ℃.
4. The method for manufacturing the acid-resistant MnNb series hot-rolled plate coil without Cu, Cr, Ni, Mo and V at low cost according to claim 3, wherein the method comprises the following steps: in the step S1, the harmful elements N are controlled to be less than or equal to 0.0050%, H is controlled to be less than or equal to 0.0002%, O is controlled to be less than or equal to 0.0025%, P is controlled to be less than or equal to 0.015%, and S is controlled to be less than or equal to 0.0020%.
5. The method for manufacturing the acid-resistant MnNb series hot-rolled steel sheet coil with low cost without Cu, Cr, Ni, Mo or V according to claim 3 or 4, wherein: in the step S1, the inclusion modification technology can adopt a Ca treatment process or a Mg treatment process, the Ca/S in the total molten steel of the Ca treatment process is controlled to be 1.5-3.0, and the soft blowing time after the calcium treatment is not less than 4 min; the Mg content in the Mg treatment process is controlled according to 0.0002-0.0022 percent.
6. The method for manufacturing the acid-resistant MnNb series hot-rolled plate coil without Cu, Cr, Ni, Mo and V at low cost according to claim 3, wherein the method comprises the following steps: in the step S2, the casting superheat degree is controlled at 10-25 ℃, constant-speed casting is carried out, the centering of the sector section supporting guide rollers is kept, the roller spacing is reduced, and the roll gap state of the casting machine is periodically checked and adjusted.
7. The method for manufacturing the acid-resistant MnNb series hot-rolled plate coil without Cu, Cr, Ni, Mo and V at low cost according to claim 3, wherein the method comprises the following steps: in the step S2, electromagnetic stirring may be used to improve the axial crystal ratio and improve the segregation grade of the casting blank.
8. The method for manufacturing the acid-resistant MnNb series hot-rolled plate coil without Cu, Cr, Ni, Mo and V at low cost according to claim 3, wherein the method comprises the following steps: in the step S3, the heating temperature of the heating furnace is controlled to be 1150-1200 ℃; according to different charging temperatures, the in-furnace time is 160-260 min, and the heat preservation time at the high temperature of 1150-1180 ℃ is 60-100 min.
9. The method for manufacturing the acid-resistant MnNb series hot-rolled plate coil without Cu, Cr, Ni, Mo and V at low cost according to claim 3, wherein the method comprises the following steps: in the step S4, in the first stage, 1-pass large deformation rolling is carried out in an austenite region at a high temperature of above 1050 ℃, and the pass reduction rate is 10-15%; in the second stage, 5-7 times of large-deformation rolling is adopted within the temperature range of 950-1050 ℃, the reduction rate of each time is more than 10%, the cumulative reduction rate of rough rolling is 57%, and the thickness of the intermediate blank after rough rolling is 50-70 mm; the third stage is a finish rolling stage, wherein the finish rolling initial rolling temperature is set to be less than or equal to 950 ℃, the austenite non-recrystallization zone is rolled, the reduction rate of each pass is greater than 10%, the finish rolling accumulated reduction rate is 60%, and the finish rolling temperature is 810-.
10. The method for manufacturing the acid-resistant MnNb series hot-rolled plate coil with low cost without Cu, Cr, Ni, Mo and V according to claim 9, wherein the method comprises the following steps: and (3) water is sprayed on the surface for cooling in the rough rolling process, the cooling gradient from the surface to the core of the casting blank is adjusted, the easy segregation structure and the coarse structure of the core are reduced, and the high-permeability rolling of the full-thickness section is realized.
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