CN115233093A - Welding bottle steel hot-rolled plate strip HP295 - Google Patents

Welding bottle steel hot-rolled plate strip HP295 Download PDF

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Publication number
CN115233093A
CN115233093A CN202210773214.7A CN202210773214A CN115233093A CN 115233093 A CN115233093 A CN 115233093A CN 202210773214 A CN202210773214 A CN 202210773214A CN 115233093 A CN115233093 A CN 115233093A
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equal
rolled plate
plate strip
less
steel
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CN115233093B (en
Inventor
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. 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 0.07wt%, mn: 0.70-1.00 wt%, P is less than or equal to 0.020wt%, S is less than or equal to 0.010wt%, alt: 0.020-0.050 wt%, N is less than or equal to 0.0050wt%, 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 8mm; the yield ratio of the welded steel hot rolled plate strip is controlled to be 0.65-0.75, and the 180-degree cold bending performance is 100 percent qualified. 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

Weld the steel hot-rolled plate belt HP295 of the bottle
The invention is a divisional application, a mother case: application No.: 2021110685240, name: the welding bottle steel hot rolled plate strip HP295 and the manufacturing method thereof have the application date that: 09 and 13 days 2021
Technical Field
The invention relates to the field of steel rolling, in particular to a bottle-welded steel hot-rolled plate strip HP295.
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 R eL More than or equal to 295MPa and tensile strength R m 440-560 MPa, the 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 =2 a) is qualified. The yield ratio is the ratio of the yield strength to the tensile strength of the material, and if the yield ratio is too high, the structure is brittle failure, because the structure is not obviously deformed during the failure and is difficult to generateTo prevent, brittle failure is therefore critical 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 properties.
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 0.07wt%, mn: 0.70-1.00 wt%, P is less than or equal to 0.020wt%, S is less than or equal to 0.010wt%, alt: 0.020-0.050 wt%, N is less than or equal to 0.0050wt%, 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: 2mm to 8mm thick;
the yield ratio of the welded steel hot rolled plate strip is controlled to be 0.65-0.75, and the 180-degree cold bending performance is 100 percent qualified.
Further, the welded bottle steel hot-rolled plate strip HP295 comprises the following chemical components in percentage by weight: c:0.143 to 0.156wt%, si is less than or equal to 0.052wt%, 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 less than or equal to 0.0043wt%, ti:0.014 to 0.016wt%; 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 3mm.
Further, C:0.145wt%, si:0.038wt%, mn:0.78wt%, P is less than or equal to 0.015wt%, S:0.007wt%, alt:0.033wt%, N not more than 0.0030wt%, ti:0.016wt%; the balance of Fe and inevitable trace elements.
Further, C:0.147wt%, si not more than 0.026wt%, mn:0.77wt%, P is less than or equal to 0.011wt%, S:0.007wt%, alt:0.028wt%, N is less than or equal to 0.0043wt%, ti:0.014wt%; the balance of Fe and inevitable trace elements.
Further, C:0.143wt%, si not more than 0.052wt%, mn:0.74wt%, P is less than or equal to 0.014wt%, S:0.005wt%, alt:0.028wt%, N not more than 0.0038wt%, ti:0.014wt%; the balance of Fe and inevitable trace elements.
Further, C:0.156wt%, si not more than 0.042wt%, mn:0.78wt%, P is less than or equal to 0.012wt%, S:0.007wt%, alt:0.029wt%, N is less than or equal to 0.0035wt%, ti:0.015wt%; 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 specifications 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 gas is blown from the bottom in the whole process, and the end point of the converter is controlled by C:0.06 to 0.12 weight percent of the total weight of the components, and less than or equal to 0.020 weight percent of P.
Further, LF molten steel refining treatment: carrying out desulfurization, impurity removal, temperature balance and alloying treatment on the molten steel in an LF furnace; soft argon blowing time is 8-10 min after calcium treatment; the molten steel calming time is required to be 15-30 min, so that impurities in the steel can be fully gathered and floated to remove, and the risks of long production period, large temperature drop of the molten steel and secondary oxidation of the molten steel are effectively avoided.
Slab continuous casting: the method adopts ladle slag discharge detection control, the pouring temperature of a tundish is 1530-1560 ℃, the tundish uses an alkaline covering agent, the low-carbon steel crystallizer covering slag is used, and the casting blank casting 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: controlling the soaking temperature of the heating furnace to be 1220-1280 ℃ to ensure that the casting blank is in the furnaceThe heating time is more than or equal to 120min, and the soaking time is more than or equal to 20min. Ti microalloying elements in the steel are fully and effectively dissolved; target temperature of finish rolling
Figure BDA0003725056240000021
Cooling by adopting a two-stage cooling process after rolling, and carrying out layer cooling at a target temperature
Figure BDA0003725056240000022
Further, a two-stage cooling process is adopted after rolling, the temperature of the hot rolled plate strip of the welded steel bottle is reduced to be between Ar1 and Ar3 after the hot rolled plate strip passes through a first stage water cooling zone, eutectoid ferrite is precipitated, phase transformation of A → GB and A → F + P 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 the 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 welded 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 R eL More than or equal to 295MPa and tensile strength R m The 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 180-degree cold bending (d =2 a) performance is fully qualified. The invention carries out micro titanium treatment on the welding bottle steel, improves the quality of corners and is beneficial to welding the welding bottle.
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 according to example 1 of the present invention, in which the content ratios 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 0.07wt%, mn: 0.70-1.00 wt%, P is less than or equal to 0.020wt%, S is less than or equal to 0.010wt%, alt: 0.020-0.050 wt%, N is less than or equal to 0.0050wt%, 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 0.0050wt%, 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 casting process of 'weak cooling, low superheat degree, constant pulling speed and high straightening temperature' and a casting process of 'weak cooling, low superheat degree, constant pulling speed and high straightening temperature'.
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 BDA0003725056240000042
Cooling by two-stage cooling process after rolling (figure 1), and target temperature of layer cooling
Figure BDA0003725056240000043
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 zone 1 And Ar 3 And the eutectoid ferrite is precipitated, the phase transformation of A → GB and A → F + P occurs during the water cooling of the second section, the metallographic structure of the rolled steel strip is equiaxial F + GB + P, and the grain size is uniform. Compared with the traditional continuous cooling process after rolling, the continuous cooling process is directly carried out from the final rolling temperature to the laminar cooling temperature of about 600 ℃, the supercooling degree is larger, F is formed at a lower temperature, the diffusion type phase change of F is inhibited, and polygonal and acicular ferrite and more granular Behcet's grains are formedAnd body, which is not conducive to control of performance stability.
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 composition (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 BDA0003725056240000041
Figure BDA0003725056240000051
TABLE 3 mechanical properties of the high-quality hot rolled steel strip HP295 obtained in each example
Examples of the invention R eL /MPa R m /MPa A/％ Yield ratio 180 ° cold bending, D =2a
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 is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims (7)

1. The welded bottle steel hot rolled plate strip HP295 is characterized in that the welded bottle steel hot rolled plate strip HP295 comprises the following chemical components in percentage by weight: c:0.143 to 0.156wt%, si is less than or equal to 0.052wt%, 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 less than or equal to 0.0043wt%, ti:0.014 to 0.016wt%; the balance of Fe and inevitable trace elements; (ii) a
The specification of the welded bottle steel hot-rolled plate strip HP295 is as follows: the thickness is 2mm to 8mm;
the yield ratio of the welded steel hot rolled plate strip is 0.65-0.75, and the 180-degree cold bending performance is 100 percent qualified;
the welded bottle steel hot-rolled plate strip HP295 is manufactured by the following method: 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 hot continuous 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 20min;
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 zone 1 And ferrite transformation start temperature Ar 3 Firstly 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 Ar 1 Refers to the temperature at which austenite transforms to pearlite upon cooling, ar 3 Refers to the starting temperature of ferrite transformation upon cooling, a refers to austenite, and GB refers to granular bainite.
2. The welded bottle steel hot rolled plate strip HP295 of claim 1, wherein the welded bottle steel hot rolled plate strip HP295 comprises the following chemical components in percentage by weight: c:0.143 to 0.156wt%, si is less than or equal to 0.052wt%, 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 is less than or equal to 0.0043wt%, ti:0.014 to 0.016wt%; 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 3mm.
3. The weld flask steel hot rolled plate strip HP295 of claim 1, wherein C:0.145wt%, si:0.038wt%, mn:0.78wt%, P is less than or equal to 0.015wt%, S:0.007wt%, alt:0.033wt%, N not more than 0.0030wt%, ti:0.016wt%; the balance of Fe and inevitable trace elements.
4. The weld flask steel hot rolled plate strip HP295 of claim 1, wherein C:0.147wt%, si not more than 0.026wt%, mn:0.77wt%, P is less than or equal to 0.011wt%, S:0.007wt%, alt:0.028wt%, N is less than or equal to 0.0043wt%, ti:0.014wt%; the balance of Fe and inevitable trace elements.
5. The weld flask steel hot rolled plate strip HP295 of claim 1, wherein C:0.143wt%, si not more than 0.052wt%, mn:0.74wt%, P is less than or equal to 0.014wt%, S:0.005wt%, alt:0.028wt%, N not more than 0.0038wt%, ti:0.014wt%; the balance of Fe and inevitable trace elements.
6. The weld flask steel hot rolled plate strip HP295 of claim 1, wherein C:0.156wt%, si is less than or equal to 0.042wt%, mn:0.78wt%, P is less than or equal to 0.012wt%, S:0.007wt%, alt:0.029wt%, N is less than or equal to 0.0035wt%, ti:0.015wt%; the balance of Fe and inevitable trace elements.
7. The method for manufacturing the welded-bottle steel hot-rolled plate strip HP295 of claim 1, wherein LF molten steel refining treatment comprises: carrying out desulfurization, impurity removal, temperature balance and alloying treatment on the molten steel in an LF furnace; the soft argon blowing time is 8-10 min after the calcium treatment; the molten steel sedation time is required to be 15-30 min, thus ensuring that the impurities in the steel can be fully gathered and floated to be removed, and effectively avoiding the risks of long production period, large molten steel temperature drop and secondary oxidation of the molten steel.
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CN202111068524.0A CN113930674B (en) 2021-09-13 2021-09-13 Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof
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CN115418575A (en) * 2022-10-21 2022-12-02 重庆钢铁股份有限公司 High-precision low-yield-ratio steel belt for HP295 welded gas cylinder and production method thereof

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