CN115537662A - Normalized Q345qD steel plate for air-rail track beam and manufacturing method thereof - Google Patents
Normalized Q345qD steel plate for air-rail track beam 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
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- C22C38/00—Ferrous alloys, e.g. steel 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
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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
- C21D8/0221—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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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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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Abstract
The invention belongs to the technical field of steel production, and relates to a normalized Q345qD steel plate for an air-rail track beam and a manufacturing method thereof, wherein the process comprises the following steps: desulfurized molten iron → converter smelting → external refining → continuous casting → slab heating → descaling → rough rolling → finish rolling → ACC cooling → straightening → surface inspection → fault detection → heat treatment → straightening → head cutting, tail cutting, edge cutting → sampling inspection is qualified → spray printing, labeling → warehousing; the steel plate material comprises the following chemical components in percentage by weight: c:0.14% -0.17%, si:0.10% -0.30%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, mn:1.4% -1.55%, als:0.020 to 0.040%, nb: 0.010-0.020%, V:0.050 to 0.070%, ti: 0.010-0.020%, B: not more than 0.0005%, the balance being Fe and inevitable impurities, controlling the carbon equivalent CEV:0.39% -0.43%; according to the invention, through reasonably optimizing chemical components and rolling process design, narrow-range control of C, si and Mn elements is realized, and the produced steel plate has low yield ratio, good impact toughness and lamellar tearing resistance.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to a normalized Q345qD steel plate for an air-rail track beam and a manufacturing method thereof.
Background
With the continuous acceleration of the urbanization process, the existing traffic can not meet the traveling requirements of people, and the automobile congestion phenomenon of different degrees exists in all the big cities in the world. Therefore, various ways to solve the traffic congestion problem caused by the increasing traffic volume are being sought. The air rail train moves ground traffic to the air, and has the advantages of small influence on ground building facilities, high train running speed after opening, flexible track trend laying, no environmental pollution in the running process and the like in the construction and running processes, so that the air rail train is rapidly developed in a plurality of cities and among the cities. Unlike subway and tram, the overhead rail of an overhead rail, i.e., a suspended overhead monorail transit system, is a rail transit system that runs suspended on an overhead rail. The air iron mainly adopts a form of a viaduct, and the track beam of the air iron has higher requirements on unevenness of a steel plate, low-temperature impact toughness, yield ratio and structural uniformity.
The bridge steel is mostly rolled by control, the finish rolling temperature of the steel plate is low, and the rolled plate shape is not well controlled. When cooling behind the cooling bed on the steel sheet, there are heat radiation and convection heat transfer between the upper and lower surface of steel sheet and the environment, and the lower surface of contacting with the cooling bed because still have conduction heat transfer between with the cooling bed, its heat transfer efficiency is greater than the upper surface with air contact, leads to the steel sheet surface cooling uneven from top to bottom to lead to steel sheet temperature and inside thermal stress to distribute inhomogeneously. When the thermal stress exceeds the yield strength of the material, plastic deformation occurs, and the steel plate has the defects of warping, wave shape, transverse bending, bulging and the like, so that the flatness of the steel plate exceeds the standard, and the lower the environmental temperature is, the larger the deformation of the steel plate is. The use requirements cannot be met. In summary, the following problems exist in the prior art: the low-temperature high-pressure technology and the TMCP rolling and cooling control technology are adopted, the plate shape control is not favorable, and the requirements that the low-temperature weight of the air-rail track beam steel plate is more than or equal to 150J, the yield ratio is less than or equal to 0.80, the unevenness is less than or equal to 3mm/mm and the like cannot be met.
In the prior art, for example, chinese patent publication No. CN114540580A discloses a method for producing a low-cost Q345Q series bridge steel plate, which contains 0.10-0.13% of C, 0.25-0.35% of Si, and Mn:1.4% -1.5%, P: less than or equal to 0.015%, S: less than or equal to 0.004%, ALs:0.020 to 0.040, ti:0.002 to 0.012, nb:0.020 to 0.030, B: less than or equal to 0.0005 percent, and the balance of Fe and inevitable impurities. The adopted production method comprises the following steps: molten iron pre-desulfurization treatment → 120t converter → LF refining + RH vacuum degassing → continuous casting → slab heating → controlled rolling → heap cooling → (flaw detection) → finishing → sampling inspection → marking → warehousing. Therefore, the low-temperature large-pressure technology and the TMCP controlled rolling and cooling technology are adopted: the nucleation rate of ferrite is increased, so that ferrite grains are refined, the banded structure can be improved by controlling cooling after rolling control, pearlite pellets are refined, the spacing between pearlite lamellae is reduced, the effects of fine grain strengthening and precipitation strengthening are fully exerted, and the mechanical property index of the product is increased. The invention adopts a low-temperature large-reduction technology and a TMCP rolling and cooling control technology, is not favorable for shape control, and cannot meet the requirements of unevenness, low-temperature impact toughness and structural uniformity of the steel plate of the air-rail track beam.
Disclosure of Invention
In view of the above, the present invention aims to solve the defects in the prior art, and provides a normalized Q345qD steel plate for an air-rail beam and a manufacturing method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a normalized Q345qD steel plate for an air-rail track beam comprises the following chemical components in percentage by weight: c:0.14% -0.17%, si:0.10% -0.30%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, mn:1.4% -1.55%, als:0.020 to 0.040%, nb: 0.010-0.020%, V:0.050 to 0.070%, ti: 0.010-0.020%, B: less than or equal to 0.0005 percent, the balance of Fe and inevitable impurities, and the carbon equivalent CEV is 0.39-0.43 percent.
A manufacturing method of a normalized Q345qD steel plate for an air-rail track beam comprises the following steps:
preparing materials: the chemical components by weight percentage are as follows: c:0.14% -0.17%, si: 0.10-0.30%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, mn:1.4% -1.55%, als:0.020 to 0.040%, nb: 0.010-0.020%, V:0.050 to 0.070%, ti: 0.010-0.020%, B: not more than 0.0005%, the balance being Fe and inevitable impurities, controlling the carbon equivalent CEV:0.39% -0.43%;
KR desulfurization: controlling the sulfur content of the desulfurization target to be less than or equal to 0.005 percent;
smelting in a converter: controlling the end point temperature to be 1600-1625 ℃, and the end point oxygen content to be less than or equal to 600ppm;
LF refining: controlling the LF outbound temperature to 1585-1595 ℃, the desulfurization rate to be more than or equal to 80 percent and the outbound S content to be less than or equal to 0.010 percent;
RH refining: vacuum treatment is carried out, the ultimate vacuum degree is less than or equal to 273Pa, the high vacuum circulation time of the molten steel is more than or equal to 20min, the argon blowing small pipes of the immersion pipe are unobstructed and more than or equal to 9, the RH pure degassing time is more than or equal to 5min, and the RH outbound temperature is 1550-1560 ℃;
continuous casting: controlling the liquidus temperature of 1515 ℃, the target temperature of the tundish molten steel of 1530-1545 ℃, the fluctuation of the crystallizer liquid level is less than or equal to 3mm, and the nitrogen content of the tundish molten steel is less than or equal to 40ppm;
heating the plate blank: the heating temperature is 1050-1150 ℃, and the furnace time is 170-250 min;
rolling: the rolling adopts a two-stage controlled rolling and controlled cooling process, the temperature of finish rolling is controlled to be about 840 ℃, the temperature of finish cooling is controlled to be between 660 and 700 ℃, the cooling speed is 6 to 15 ℃/s, thermal straightening is carried out after cooling, the straightening is carried out for more than or equal to 3 times, and the straightening is carried out for 1.5mm;
and (3) heat treatment: and performing secondary hot straightening after the heat treatment, wherein the unevenness is more than 3 mm/m.
Further, in the heat treatment process, when the thickness of the steel plate is 12-20 mm, the normalizing temperature is controlled to be 870 +/-10 ℃, and the heating coefficient is controlled to be 1.2-1.5 min/mm; when the thickness of the steel plate is 20-36 mm, the normalizing temperature is controlled to 860 +/-10 ℃, and the heating coefficient is 1.1-1.4 min/mm.
The invention has the beneficial effects that:
1. all mechanical properties of the normalized Q345qD steel plate for the air-iron track beam produced by the invention are higher than the requirements of national standard GB/T714-2015 of structural steel plates for bridges, the average value of low-temperature impact properties at-20 ℃ reaches 233J, the normalized Q345qD steel plate has excellent low-temperature impact toughness, the unevenness is less than or equal to 3mm/m, the normalized Q345qD steel plate has good plate shape, the yield ratio is 0.73, and the normalized Q345qD steel plate is favorable for the installation precision and the structural safety of the air-iron track beam.
2. The invention can conveniently realize batch production of different widths and thicknesses by reasonably designing chemical component proportion, a steel-making process, a steel rolling process and a heat treatment process and controlling narrow ranges of Nb, V and Ti elements. The produced steel plate has the characteristics of low yield ratio, good impact toughness, high precision plate shape control, labor saving and energy saving.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
A manufacturing method of a normalized Q345qD steel plate for an air-rail track beam comprises the following overall process flows: molten iron desulphurization → converter smelting → refining outside of the furnace → continuous casting → heating of plate blank → descaling → rough rolling → finish rolling → ACC cooling → straightening → surface inspection → fault detection → heat treatment → straightening → head cutting, tail cutting, edge cutting → qualified sampling → spray printing, labeling → warehousing; the method comprises the following steps:
preparing materials: the chemical components by weight percentage are as follows: c:0.14% -0.17%, si: 0.10-0.30%, P: less than or equal to 0.018%, S: less than or equal to 0.005%, mn:1.4% -1.55%, als:0.020 to 0.040%, nb: 0.010-0.020%, V:0.050 to 0.070%, ti: 0.010-0.020%, B: not more than 0.0005 percent, and the balance of Fe and inevitable impurities, and the carbon equivalent CEV is controlled as follows: 0.39% -0.43%;
KR desulfurization: controlling the sulfur content of the desulfurization target to be less than or equal to 0.005 percent;
smelting in a converter: controlling the end point temperature to be 1600-1625 ℃, wherein the end point oxygen content is less than or equal to 600ppm;
LF refining: controlling the LF outbound temperature to be 1585-1595 ℃, controlling the desulfurization rate to be more than or equal to 80% and controlling the outbound S content to be less than or equal to 0.010%;
RH refining: vacuum treatment is carried out, the ultimate vacuum degree is less than or equal to 273Pa, the high vacuum circulation time of the molten steel is more than or equal to 20min, the argon blowing small pipes of the immersion pipe are unobstructed and more than or equal to 9, the RH pure degassing time is more than or equal to 5min, and the RH outbound temperature is 1550-1560 ℃;
continuous casting: the liquidus temperature is 1515 ℃, the target temperature of the tundish molten steel is 1530-1545 ℃, the fluctuation of the crystallizer liquid level is less than or equal to 3mm, and the nitrogen content of the tundish molten steel is less than or equal to 40ppm;
heating a plate blank: the heating temperature is 1050-1150 ℃, and the furnace time is 170-250 min;
rolling: the rolling adopts a two-stage controlled rolling and controlled cooling process, the finish rolling temperature is controlled to be about 840 ℃, the finish cooling temperature is controlled to be between 660 and 700 ℃, the cooling speed is 6 to 15 ℃/s, the hot straightening is carried out after the cooling, the straightening is not less than 3 times, and the straightening is 1.5mm;
and (3) heat treatment: when the thickness of the steel plate is 12-20 mm, controlling the normalizing temperature to 870 +/-10 ℃ and the heating coefficient to be 1.2-1.5 min/mm; when the thickness of the steel plate is 20-36 mm, the normalizing temperature is controlled to 860 +/-10 ℃, and the heating coefficient is 1.1-1.4 min/mm. And performing secondary hot straightening after the heat treatment, wherein the unevenness is more than 3 mm/m.
The method of the invention is adopted to produce steel plates with the thickness of 12mm, 24mm, 28mm and 36mm respectively, and the material components are shown in the following table 1:
TABLE 1
| Test steel plate | Thickness/mm | C | Si | Mn | P | S | ALs | Nb | TI | V | CEV | B |
| Steel plate A | 12 | 0.14 | 0.15 | 1.46 | 0.012 | 0.004 | 0.030 | 0.012 | 0.017 | 0.060 | 0.40 | 0.0003 |
| Steel plate B | 24 | 0.16 | 0.16 | 1.46 | 0.015 | 0.005 | 0.025 | 0.015 | 0.018 | 0.056 | 0.42 | 0.0002 |
| Steel plate C | 28 | 0.16 | 0.16 | 1.45 | 0.016 | 0.003 | 0.030 | 0.015 | 0.019 | 0.060 | 0.42 | 0.0002 |
| Steel plate D | 36 | 0.15 | 0.19 | 1.44 | 0.014 | 0.004 | 0.030 | 0.015 | 0.014 | 0.053 | 0.41 | 0.0004 |
The production process parameters are shown in table 2:
TABLE 2
The produced steel plates were tested, and the test results are shown in table 3:
TABLE 3
As can be seen from Table 3, the normalized Q345qD steel plate for producing the air-rail track beam has the mechanical properties higher than the requirements of the national standard GB/T714-2015 of the structural steel plate for the bridge, the average value of the low-temperature impact property at-20 ℃ reaches 233J, the low-temperature impact toughness is excellent, the unevenness is less than or equal to 3mm/m, the plate shape is good, and the low yield ratio is favorable for the installation precision and the structure safety of the air-rail track beam.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A normalized Q345qD steel plate for an air-rail track beam is characterized in that: the steel plate comprises the following chemical components in percentage by weight: c:0.14% -0.17%, si: 0.10-0.30%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, mn:1.4% -1.55%, als:0.020 to 0.040%, nb: 0.010-0.020%, V:0.050 to 0.070%, ti: 0.010-0.020%, B: less than or equal to 0.0005 percent, the balance of Fe and inevitable impurities, and the carbon equivalent CEV is 0.39-0.43 percent.
2. A manufacturing method of a normalized Q345qD steel plate for an air-rail track beam is characterized by comprising the following steps:
preparing materials: the chemical components by weight percentage are as follows: c:0.14% -0.17%, si:0.10% -0.30%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, mn:1.4% -1.55%, als:0.020 to 0.040%, nb: 0.010-0.020%, V:0.050 to 0.070%, ti: 0.010-0.020%, B: not more than 0.0005%, the balance being Fe and inevitable impurities, controlling the carbon equivalent CEV:0.39% -0.43%;
KR desulfurization: controlling the sulfur content of the desulfurization target to be less than or equal to 0.005 percent;
smelting in a converter: controlling the end point temperature to be 1600-1625 ℃, wherein the end point oxygen content is less than or equal to 600ppm;
LF refining: controlling the LF outbound temperature to be 1585-1595 ℃, controlling the desulfurization rate to be more than or equal to 80% and controlling the outbound S content to be less than or equal to 0.010%;
RH refining: vacuum treatment is carried out, the ultimate vacuum degree is less than or equal to 273Pa, the high vacuum circulation time of the molten steel is more than or equal to 20min, the argon blowing small pipes of the immersion pipe are unobstructed and more than or equal to 9, the RH pure degassing time is more than or equal to 5min, and the RH outbound temperature is 1550-1560 ℃;
continuous casting: controlling the liquidus temperature of 1515 ℃, the target temperature of the tundish molten steel of 1530-1545 ℃, the fluctuation of the crystallizer liquid level is less than or equal to 3mm, and the nitrogen content of the tundish molten steel is less than or equal to 40ppm;
heating the plate blank: the heating temperature is 1050-1150 ℃, and the furnace time is 170-250 min;
rolling: the rolling adopts a two-stage controlled rolling and controlled cooling process, the finish rolling temperature is controlled to be about 840 ℃, the finish cooling temperature is controlled to be between 660 and 700 ℃, the cooling speed is 6 to 15 ℃/s, the hot straightening is carried out after the cooling, the straightening is not less than 3 times, and the straightening is 1.5mm;
and (3) heat treatment: and performing secondary hot straightening after the heat treatment, wherein the unevenness is more than 3 mm/m.
3. The method for manufacturing a normalized Q345qD steel plate for a hollow rail beam as claimed in claim 2, wherein: in the heat treatment process, when the thickness of the steel plate is 12-20 mm, the normalizing temperature is controlled to be 870 +/-10 ℃, and the heating coefficient is 1.2-1.5 min/mm; when the thickness of the steel plate is 20-36 mm, the normalizing temperature is controlled to 860 +/-10 ℃, and the heating coefficient is 1.1-1.4 min/mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116657053A (en) * | 2023-06-25 | 2023-08-29 | 重庆钢铁股份有限公司 | TMCP state Q345qD steel plate and manufacturing method thereof |
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