CN113930674B - Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof - Google Patents

Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof Download PDF

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CN113930674B
CN113930674B CN202111068524.0A CN202111068524A CN113930674B CN 113930674 B CN113930674 B CN 113930674B CN 202111068524 A CN202111068524 A CN 202111068524A CN 113930674 B CN113930674 B CN 113930674B
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steel
rolled plate
plate strip
equal
welded
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CN113930674A (en
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李宗强
樊雷
李显
廖耀俊
赵忠云
陈友操
陈思
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Guangxi Liuzhou Iron and Steel Group Co Ltd
Guangxi Liugang Huachuang Technology R&D Co Ltd
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Guangxi Liuzhou Iron and Steel Group Co Ltd
Guangxi Liugang Huachuang Technology R&D 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C21D8/0247—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
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/009—Pearlite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention provides a welded bottle steel hot-rolled plate strip HP295 and a manufacturing method thereof. The welded bottle steel hot rolled plate strip HP295 comprises the following chemical components in percentage by weight: c: 0.13-0.16 wt%, Si is less than or equal to 0.07 wt%, Mn: 0.70-1.00 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.010 wt%, Alt: 0.020-0.050 wt%, N is less than or equal to 0.0050 wt%, and Ti: 0.010-0.020 wt%; the balance of Fe and inevitable trace elements; the specification of the welded bottle steel hot-rolled plate strip HP295 is as follows: the thickness is 2mm to 8 mm; the yield ratio of the hot rolled plate strip of the welded bottle steel is controlled to be 0.65-0.75, and the cold bending performance at 180 degrees is 100% qualified. The manufacturing method adopts the components and specifications of the welded bottle steel hot rolled plate strip HP 295. The invention can obtain the high-quality welding bottle steel hot-rolled plate strip HP295 with good comprehensive mechanical index, stable stamping processing performance and high use safety.

Description

Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof
Technical Field
The invention relates to the field of steel rolling, in particular to a welded bottle steel hot-rolled plate strip HP295 and a manufacturing method thereof.
Background
The steel products for welding cylinder are mainly applied to liquefied gas cylinder, oxygen cylinder and the like.
The national standard GB 6653 Steel plate and Steel strip for welded gas cylinders, the Chinese trademark HP295, requires yield strength ReLMore than or equal to 295MPa and tensile strength RmThe elongation A is more than or equal to 26 percent, the yield ratio is less than or equal to 0.8, and the performance of 180-degree cold bending (d is 2a) is qualified. Yield ratio refers to the ratio of the yield strength to the tensile strength of a material, and if the yield ratio is too high, the structure is broken frangibly, because the structure is not deformed obviously during breaking and is difficult to prevent, so that the frangibility is strictly prohibited in civil engineering. The welded steel bottle is used for special purposes of the storage pressure tank, the use safety of the welded steel bottle is more important, and the plate strip has a lower yield ratio and is an extremely important index for ensuring the use safety. The prior welded bottle steel hot rolled plate strip has poor comprehensive mechanical property.
In summary, the following problems exist in the prior art: the welding bottle steel hot rolled plate strip has poor comprehensive mechanical properties, and the safety of the welding bottle is influenced.
Disclosure of Invention
The invention provides a welded bottle steel hot-rolled plate strip HP295 and a manufacturing method thereof, and aims to provide a high-quality welded bottle steel hot-rolled plate strip HP295 which is good in comprehensive mechanical property, stable in stamping processing performance and high in use safety.
Therefore, the invention provides a welded bottle steel hot-rolled plate strip HP295, namely a high-quality welded bottle steel hot-rolled plate strip, wherein the welded bottle steel hot-rolled plate strip HP295 comprises the following chemical components in percentage by weight: c: 0.13-0.16 wt%, Si is less than or equal to 0.07 wt%, Mn: 0.70-1.00 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.010 wt%, Alt: 0.020-0.050 wt%, N is less than or equal to 0.0050 wt%, and Ti: 0.010-0.020 wt%; the balance of Fe and inevitable trace elements;
the specification of the welded bottle steel hot-rolled plate strip HP295 is as follows: the thickness is 2mm to 8 mm;
the yield ratio of the hot rolled plate strip of the welded bottle steel is controlled to be 0.65-0.75, and the cold bending performance at 180 degrees is 100% qualified.
Further, the welded bottle steel hot-rolled plate strip HP295 comprises the following chemical components in percentage by weight: c: 0.143-0.156 wt%, Si is less than or equal to 0.052 wt%, Mn: 0.70-0.80 wt%, P is less than or equal to 0.015wt%, S: 0.005wt% -0.007 wt%, Alt: 0.028-0.033 wt%, N not more than 0.0043wt%, Ti: 0.014-0.016 wt%; the balance of Fe and inevitable trace elements; the specification of the welded bottle steel hot-rolled plate strip HP295 is as follows: the thickness is 3 mm.
Further, C: 0.145 wt%, Si: 0.038 wt%, Mn: 0.78 wt%, P is less than or equal to 0.015wt%, S: 0.007 wt%, Alt: 0.033wt%, N is not more than 0.0030 wt%, Ti: 0.016 wt%; the balance of Fe and inevitable trace elements.
Further, C: 0.147 wt%, Si not more than 0.026 wt%, Mn: 0.77 wt%, P is less than or equal to 0.011 wt%, S: 0.007 wt%, Alt: 0.028 wt%, N is less than or equal to 0.0043wt%, Ti: 0.014 wt%; the balance of Fe and inevitable trace elements.
Further, C: 0.143 wt%, Si is less than or equal to 0.052 wt%, Mn: 0.74 wt%, P is less than or equal to 0.014 wt%, S: 0.005wt%, Alt: 0.028 wt%, N not more than 0.0038 wt%, Ti: 0.014 wt%; the balance of Fe and inevitable trace elements.
Further, C: 0.156wt%, Si not more than 0.042 wt%, Mn: 0.78 wt%, P is less than or equal to 0.012 wt%, S: 0.007 wt%, Alt: 0.029 wt%, N is less than or equal to 0.0035 wt%, Ti: 0.015 wt%; the balance of Fe and inevitable trace elements.
The invention provides a manufacturing method of a welded bottle steel hot rolled plate strip HP295, which adopts the components and the specification of the welded bottle steel hot rolled plate strip HP 295; the manufacturing method adopts the following process route: smelting blast furnace molten iron, desulfurizing pretreatment of molten iron, smelting converter molten steel, refining LF molten steel, continuously casting plate blanks, heating the plate blanks, continuously hot rolling and leveling.
Smelting molten steel in a converter: argon bottom blowing is adopted in the whole process, and the end point of the converter is controlled by C: 0.06-0.12 wt% and P is less than or equal to 0.020 wt%.
Further, LF molten steel refining treatment: carrying out desulfurization, impurity removal, temperature balance and alloying treatment on the molten steel in an LF furnace; after calcium treatment, soft argon blowing time is 8-10 min; the molten steel calming time is required to be 15-30 min, impurities in steel can be fully gathered and floated to be removed, and the risks of long production period, large molten steel temperature drop and secondary oxidation of the molten steel are effectively avoided.
Slab continuous casting: and (3) ladle slag discharging detection control is adopted, the pouring temperature of the tundish is 1530-1560 ℃, the tundish uses an alkaline covering agent, low-carbon steel crystallizer covering slag is used, and the casting blank drawing speed is 0.90-1.21 m/min.
The high-precision continuous casting control process comprises the following steps: the casting process of 'weak cooling, low superheat degree, constant drawing speed and high straightening temperature' is adopted to reduce the generation of surface cracks of the plate blank.
Further, the hot rolling process: the soaking temperature of the heating furnace is controlled to be 1220-1280 ℃, the heating time of the casting blank in the furnace is guaranteed to be more than or equal to 120min, and the soaking time is guaranteed to be more than or equal to 20 min. Ti microalloying elements in the steel are fully and effectively dissolved; target temperature of finish rolling
Figure BDA0003259524320000021
Cooling by adopting a two-stage cooling process after rolling, and cooling to a target temperature of layer cooling
Figure BDA0003259524320000022
Further, a two-stage cooling process is adopted after rolling, the temperature of the hot rolled sheet strip of the steel for welding bottle is reduced to be between Ar1 and Ar3 after the hot rolled sheet strip passes through a first stage water cooling area, proeutectoid ferrite is separated out, A → GB and A → F + P phase transformation occurs during second stage water cooling, and the metallographic structure of the rolled steel strip is equiaxial F + GB + P.
According to the invention, a proper amount of Ti microalloy is added into steel, the N content in the steel is strictly controlled, and a reasonable smelting-continuous casting-rolling process is formulated, so that the stable production of the product is realized, and the high-quality welding bottle steel hot rolled plate strip HP295 with good comprehensive mechanical index, stable stamping processing performance and high use safety is obtained. The high-quality welded bottle steel hot-rolled plate strip HP295 obtained by the invention has yield strength ReLMore than or equal to 295MPa and tensile strength RmThe elongation A is more than or equal to 26 percent and is 440-560 MPa, the yield ratio is controlled to be 0.65-0.75, and the performance of 180-degree cold bending (d is 2a) is fully qualified. The invention carries out micro-welding on the steel of the welding bottleTitanium treatment improves corner quality, and is favorable for welding bottle welding.
Drawings
FIG. 1 is a schematic diagram of a simulation of temperature change during a layer cooling process according to the present invention; wherein the abscissa is time in seconds, the ordinate is temperature in seconds,
FIG. 2 is a photograph of a metallographic structure of a sample 1 of the present invention, wherein the contents of F, GB and P are: 75%, 21% and 4%.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
The technical points are as follows:
1) the high-quality steel hot-rolled plate strip HP295 of the invention comprises the following chemical components in percentage by weight: c: 0.13-0.16 wt%, Si is less than or equal to 0.07 wt%, Mn: 0.70-1.00 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.010 wt%, Alt: 0.020-0.050 wt%, N is less than or equal to 0.0050 wt%, and Ti: 0.010-0.020 wt%; the balance of Fe and inevitable trace elements.
2) The steel is added with a small amount of Ti, the Ti reacts with N, the precipitation amount of AlN generated by the reaction of N and Al can be inhibited, the surface cracks of a casting blank are effectively reduced, the quality of corner parts is improved, and the welding performance of the welding bottle is also facilitated by the micro-titanium treatment of the welding bottle steel. The N in the molten steel is controlled to be less than or equal to 0.0050 wt%, the precipitation of Ti and N in the liquid molten steel in the slab continuous casting process is reduced, and the destructive effect of the TiN precipitate with large size on the toughness of the steel plate for the welding structure can be reduced.
3) The high-precision continuous casting control process comprises the following steps: the production of surface cracks of the plate blank is reduced by adopting a 'weak cooling + low superheat degree + constant pulling speed + high straightening temperature' casting process and a 'weak cooling + low superheat degree + constant pulling speed + high straightening temperature' casting process.
4) The hot rolling process comprises the following steps: controlling the soaking temperature of a heating furnace to be 1220-1280 ℃, and ensuring that the heating time of the casting blank in the furnace is more than or equal to 120min and the soaking time is more than or equal to 20min, so that Ti microalloying elements in the steel are fully and effectively dissolved; target temperature of finish rolling
Figure BDA0003259524320000041
Cooling by two-stage cooling process (figure 1) after rolling, and layer cooling target temperature
Figure BDA0003259524320000042
5) After rolling, a two-stage cooling process is adopted, and the temperature of the steel strip is reduced to Ar after the steel strip passes through a first-stage water cooling zone1And Ar3And the proeutectoid ferrite is precipitated, phase change of A → GB and A → F + P occurs during the second stage of water cooling, the metallographic structure of the rolled steel strip is equiaxial F + GB + P, and the crystal grain size is uniform. Compared with the traditional continuous cooling process after rolling, the continuous cooling process has the advantages that the continuous cooling process is directly carried out from the final rolling temperature to the layer cooling temperature of about 600 ℃, the supercooling degree is large, F is formed at a low temperature, the diffusion type phase change of F is inhibited, polygonal and acicular ferrite and more granular bainite are formed, and the control of performance stability is not facilitated.
Example (c):
the manufacturing method of the high-quality welded bottle steel hot rolled plate strip HP295 adopts the following component proportion and specific process. Wherein, Table 1 shows the compositions (in weight%) of the steels of the respective examples. Table 2 shows the process parameters corresponding to the example steels described in table 1. Table 3 shows the mechanical properties of the steel compositions described in the examples of Table 1. The metallographic structure of the rolled steel strip is equiaxial F + GB + P, and the grain size is uniform (see figure 2, and figure 2 is a metallographic structure photograph of the invention example 1, and the content ratios of F, GB and P are 75%, 21% and 4%, respectively).
TABLE 1 product chemistry (wt%)
Examples of the invention C Si Mn P S Alt Ti N
Example 1 0.145 0.038 0.78 0.015 0.007 0.033 0.016 0.0030
Example 2 0.143 0.052 0.74 0.014 0.005 0.028 0.014 0.0038
Example 3 0.156 0.042 0.78 0.012 0.007 0.029 0.015 0.0035
Example 4 0.147 0.026 0.77 0.011 0.006 0.028 0.014 0.0043
TABLE 2 specific Process parameters for the examples
Figure BDA0003259524320000043
Figure BDA0003259524320000051
TABLE 3 mechanical properties of the high-quality hot rolled steel strip HP295 obtained in each example
Examples of the invention ReL/MPa Rm/MPa A/％ Yield ratio Cold bending at 180 deg. D2 a
Example 1 336 505 33.5 0.66 Qualified
Example 2 348 487 34.0 0.71 Qualified
Example 3 359 501 33.0 0.73 Qualified
Example 4 357 507 34.0 0.70 Qualified
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it should be apparent to one skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (2)

1. A manufacturing method of a welded bottle steel hot rolled plate strip HP295 is characterized in that the following components and specifications of the welded bottle steel hot rolled plate strip HP295 are adopted; the manufacturing method adopts the following process route: smelting blast furnace molten iron, desulfurizing pretreatment of the molten iron, smelting converter molten steel, refining treatment of LF molten steel, continuous casting of plate blanks, heating of the plate blanks, hot continuous rolling and leveling;
the welded bottle steel hot rolled plate strip HP295 comprises the following chemical components in percentage by weight: c: 0.143-0.156 wt%, Si is less than or equal to 0.052 wt%, Mn: 0.70-0.80 wt%, P is less than or equal to 0.015wt%, S: 0.005wt% -0.007 wt%, Alt: 0.028-0.033 wt%, N not more than 0.0043wt%, Ti: 0.014 to 0.016 wt%; the balance of Fe and inevitable trace elements; the specification of the welded bottle steel hot-rolled plate strip HP295 is as follows: the thickness is 3 mm;
HP295 yield strength R of hot rolled plate strip for welding bottle steeleLMore than or equal to 295MPa and tensile strength RmThe elongation A is more than or equal to 33 percent and is 440-560 MPa, the yield ratio is controlled to be 0.65-0.75, and the cold bending performance at 180 degrees is 100 percent qualified;
the hot rolling process comprises the following steps: controlling the soaking temperature of the heating furnace to be 1245-1280 ℃, and ensuring that the heating time of the casting blank in the furnace is more than or equal to 120min and the soaking time is more than or equal to 20 min;
the final rolling target temperature is 860 ℃ to 900 ℃, and the layer cooling target temperature is 580 ℃ to 620 ℃;
after rolling, adopting a two-stage cooling process, and cooling the hot rolled plate strip of the welded bottle steel to the pearlite transformation temperature Ar after the hot rolled plate strip passes through a first stage water cooling zone1And ferrite transformation start temperature Ar3Firstly eutectoid ferrite is precipitated, A → GB and A → F + P phase transformation occurs during the second stage water cooling, the metallographic structure of the rolled steel strip is equiaxial F + GB + P, wherein F refers to ferrite, P refers to pearlite, Ar refers to Ar1Refers to the temperature at which austenite transforms to pearlite upon cooling, Ar3Refers to the starting temperature of ferrite transformation upon cooling, a refers to austenite, and GB refers to granular bainite.
2. The method for manufacturing the welded-bottle steel hot-rolled plate strip HP295 of claim 1, wherein LF molten steel refining treatment comprises: the molten steel is subjected to desulfurization, inclusion removal, temperature balance and alloying treatment in an LF furnace; the soft argon blowing time is 8-10 min after the calcium treatment; the molten steel calming time is required to be 15-30 min, impurities in steel can be fully gathered and floated to be removed, and the risks of long production period, large molten steel temperature drop and secondary oxidation of molten steel are effectively avoided.
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