CN113930671A - Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof - Google Patents

Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof Download PDF

Info

Publication number
CN113930671A
CN113930671A CN202111057284.4A CN202111057284A CN113930671A CN 113930671 A CN113930671 A CN 113930671A CN 202111057284 A CN202111057284 A CN 202111057284A CN 113930671 A CN113930671 A CN 113930671A
Authority
CN
China
Prior art keywords
temperature
steel plate
toughness
percent
thick
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111057284.4A
Other languages
Chinese (zh)
Inventor
卢晓禹
王少炳
杨雄
王栋
董丽丽
李鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baotou Iron and Steel Group Co Ltd
Original Assignee
Baotou Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baotou Iron and Steel Group Co Ltd filed Critical Baotou Iron and Steel Group Co Ltd
Priority to CN202111057284.4A priority Critical patent/CN113930671A/en
Publication of CN113930671A publication Critical patent/CN113930671A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C21D2211/001—Austenite

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a steel plate for a thick-specification high-strength high-toughness structure, which comprises the following chemical components in percentage by mass: c: 0.07 to 0.09%, Si: 0.05-0.15%, Mn: 1.20-1.30%, P: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, Cr: 0.40-0.60%, Ni: 0.65-0.85%, Mo: 0.30-0.50%, Ti: 0.010-0.020%, V: 0.030-0.040%, B: 0.0010-0.0020%, Al: 0.030 to 0.060%, and the balance Fe and unavoidable impurities. The steel plate is mainly applied to a mining vehicle main body framework, ensures that the strength of the mining vehicle ensures the stability of the vehicle body in a complex and changeable environment, and reduces the probability of cracks generated on the vehicle body due to low-temperature impact toughness.

Description

Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof
Technical Field
The invention relates to a steel plate for a thick-specification high-strength high-toughness structure and a preparation method thereof.
Background
At present, application number 201210586725.4 discloses a high-quality high-yield strength structural steel S620QL1 steel plate and a production method thereof. The smelting, rolling and heat treatment processes are introduced, and the obtained S620QL1 has excellent mechanical properties. The invention adopts a reasonable heat treatment process and introduces the manufacturing process of the steel plate with the thickness within the specification range of 50-76 mm in detail, and the obtained quenched and tempered plate has high strength and excellent toughness at the temperature of-60 ℃.
Application No. 201310173749.1 discloses a method for producing an easily formable high strength medium gauge steel sheet. The Q620E steel plate which has good production performance and is easy to weld and is produced by the DQ + T process is emphasized. The steel plate produced by the off-line quenching and tempering process has better plate shape, more uniform strength and low-temperature toughness and thicker specification, and meets the requirements of users for mining vehicles.
Application number 201310559357.9 discloses a production method of a quenched and tempered high-strength Q620E super-thick steel plate. The production of 100-120 mm high-strength steel by adopting a quenching and tempering heat treatment process is mainly introduced. According to the invention, the production of the steel plate with the thickness of 50-76 mm is mainly researched, the reasonable component design and the tempering process are adopted, the steel plate has high strength and low-temperature impact toughness, and the frame performance requirements of heavy vehicle types such as mining vehicles and the like are met.
Disclosure of Invention
The invention aims to provide a thick-specification high-strength high-toughness structural steel plate and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
a steel plate for a thick-specification high-strength high-toughness structure comprises the following chemical components in percentage by mass: c: 0.07 to 0.09%, Si: 0.05-0.15%, Mn: 1.20-1.30%, P: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, Cr: 0.40-0.60%, Ni: 0.65-0.85%, Mo: 0.30-0.50%, Ti: 0.010-0.020%, V: 0.030-0.040%, B: 0.0010-0.0020%, Al: 0.030 to 0.060%, and the balance Fe and inevitable impurities, wherein the mass fraction is 100%.
Further, the chemical components in percentage by mass are as follows: c: 0.080%, Si: 0.11%, Mn: 1.24%, P: 0.010%, S: 0.001%, Cr: 0.46%, Ni: 0.75%, Mo: 0.39%, Ti: 0.012%, V: 0.032%, B: 0.0015%, Al: 0.050%, and the balance of Fe and inevitable impurities, wherein the mass fraction is 100%.
Further, the chemical components in percentage by mass are as follows: c: 0.082%, Si: 0.12%, Mn: 1.23%, P: 0.011%, S: 0.001%, Cr: 0.47%, Ni: 0.73%, Mo: 0.40%, Ti: 0.011%, V: 0.035%, B: 0.0014%, Al: 0.055 percent, the balance of Fe and inevitable impurities, and the mass fraction is 100 percent.
Further, the chemical components in percentage by mass are as follows: c: 0.078%, Si: 0.10%, Mn: 1.25%, P: 0.008%, S: 0.001%, Cr: 0.50%, Ni: 0.74%, Mo: 0.39%, Ti: 0.014%, V: 0.034%, B: 0.0016%, Al: 0.052 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities accounting for 100 percent of the total weight.
The strength of the thick steel plate is ensured by Nb, V, Ti, Cr, Mo and B through strengthening modes such as solid solution strengthening, precipitation strengthening, fine grain strengthening and the like, and the low-temperature impact toughness of the thick steel plate is improved by Ni.
The high-strength steel plate is produced by adopting molten iron pretreatment, converter steelmaking, LF external refining, RH vacuum degassing, continuous casting (electromagnetic stirring and soft pressing), heating, dephosphorization, rough rolling, finish rolling, cooling, straightening, shot blasting, quenching, tempering, cold straightening and ultrasonic flaw detection processes. Wherein the heating temperature is 1220 plus or minus 20 ℃, and the complete austenitizing temperature is reached, so that the slab structure is completely austenitized. The finishing temperature is 840 +/-15 ℃, and the finish rolling is ensured to be rolled in a completely non-recrystallization temperature region, so that austenite can not be recrystallized and grown. The off-line quenching temperature is 910 +/-10 ℃, the heat preservation time is 30min, the steel plate is fully austenitized, and the alloy is fully dissolved; the tempering temperature is 620 +/-10 ℃, the heat preservation time is 50min, the internal stress of the steel is removed through high-temperature tempering, the plate shape is ensured, and the strength and toughness of the steel are improved.
A preparation method of a steel plate for a thick-specification high-strength high-toughness structure comprises the following steps:
(1) pretreating molten iron: after the molten iron is subjected to desulfurization pretreatment, the content of S is less than or equal to 0.003 percent;
(2) converter steelmaking: the converter adopts low-sulfur scrap steel, nickel plates and other alloys are added, and the tapping temperature is more than or equal to 1620 ℃;
(3) LF refining: argon is blown in the whole process, the formation time of white slag is guaranteed (more than or equal to 15min), and then ferrochrome and ferromolybdenum are added to adjust the components;
(4) RH refining: adding ferrovanadium, ferrotitanium, ferroboron and other alloys, feeding calcium-silicon wire, and soft blowing time after wire feeding is more than or equal to 10 min;
(5) continuous casting: electromagnetic stirring and soft reduction are adopted, the pulling speed is controlled to be 0.80-1.2 m/min, and the quality of a casting blank is ensured;
(6) a heating process: cold loading the plate blank into a furnace, wherein the time of the plate blank in the furnace is 180-240 min, and the discharging temperature is 1220 +/-20 ℃;
(7) the hot rolling process comprises the following steps: rolling the casting blank to a target thickness by adopting multiple passes, wherein widening rolling is adopted for rough rolling, so that the anisotropy of the steel plate is improved, and the transverse and longitudinal properties tend to be consistent; the finish rolling temperature is controlled to be 840 +/-15 ℃, and the finish rolling temperature Tf meets the following requirements: ar3 is more than Tf and less than Tnr, so that the plate blank is rolled in a completely non-recrystallized austenite region, austenite grains and a cooled structure can be refined, the structure after heat treatment is further improved, the toughness of the steel plate is improved, and the final cooling temperature is 650 +/-15 ℃;
(8) off-line quenching: setting the quenching heating temperature according to the austenite transformation finishing temperature Ac3+ (30-50) DEG C, setting the temperature to be 910 +/-10 ℃, and keeping the temperature of the steel plate core for 30min after the steel plate core reaches the quenching temperature;
(9) tempering: the tempering temperature is 620 +/-10 ℃, and the temperature of the steel plate is kept for 50min after reaching the tempering temperature.
Compared with the prior art, the invention has the beneficial technical effects that:
the high-strength steel plate with high strength, good shaping and low-temperature impact toughness is obtained by adopting reasonable component design and a quenching and tempering process.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A steel plate for a thick-gauge high-strength high-toughness structure comprises the following chemical components in percentage by weight: 0.07 to 0.09%, Si: 0.05-0.15%, Mn: 1.20-1.30%, P: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, Cr: 0.40-0.60%, Ni: 0.65-0.85%, Mo: 0.30-0.50%, Ti: 0.010-0.020%, V: 0.030-0.040%, B: 0.0010-0.0020%, Al: 0.030 to 0.060%, and the balance of Fe and inevitable impurities, wherein the mass fraction is 100%.
The preparation method specifically comprises the following steps:
(1) pretreating molten iron: after the molten iron desulphurization pretreatment, the S content is less than or equal to 0.003 percent.
(2) Converter steelmaking: the converter adopts low-sulfur scrap steel, nickel plates and other alloys are added, and the tapping temperature is more than or equal to 1620 ℃.
(3) LF refining: argon is blown in the whole process, the formation time of white slag is guaranteed (more than or equal to 15min), and then ferrochrome, ferromolybdenum and other adjusting components are added.
(4) RH refining: adding ferrovanadium, ferrotitanium, ferroboron and other alloys, feeding calcium-silicon wire, and soft blowing time after wire feeding is more than or equal to 10 min.
(5) Continuous casting: electromagnetic stirring and soft reduction are adopted, the pulling speed is controlled to be 0.80-1.2 m/min, and the quality of a casting blank is ensured.
(6) A heating process: and (3) cold loading the plate blank into a furnace, wherein the in-furnace time is 180-240 min, and the tapping temperature is 1220 +/-20 ℃.
(7) The hot rolling process comprises the following steps: rolling the casting blank to a target thickness by adopting multiple passes, wherein widening rolling is adopted for rough rolling, so that the anisotropy of the steel plate is improved, and the transverse and longitudinal properties tend to be consistent; the finish rolling temperature is controlled to be 840 +/-15 ℃, and the finish rolling temperature TfSatisfies the following conditions: ar (Ar)3＜TfThe steel plate blank is rolled in a completely non-recrystallized austenite region, austenite grains and a cooled structure can be refined, a heat-treated structure is further improved, and the strength and toughness of the steel plate are improved. The final cooling temperature is 650 +/-15 ℃.
(8) Off-line quenching: the quenching heating temperature is set according to the austenite transformation finishing temperature Ac3Setting the temperature to be 910 +/-10 ℃ and keeping the temperature of the core of the steel plate for 30min after the core of the steel plate reaches the quenching temperature.
(9) Tempering: the tempering temperature is 620 +/-10 ℃, the temperature of the steel plate is kept for 50min after reaching the tempering temperature, martensite lath bundles and sheet or rod-shaped cementite are eliminated, the strength is reduced, the plasticity and the toughness are improved, and the strength and the toughness of the steel plate are reasonably matched.
Embodiments 1-3 are process steps and mechanical properties for producing a steel plate for a thick-specification high-strength high-toughness structure by adopting reasonable components and a quenching and tempering process.
The chemical composition content of each example is shown in table 1; the heating process parameters are shown in Table 2; the heat treatment process parameters are shown in Table 3; the mechanical properties of the steel plate for the thick-gauge high-strength high-toughness structure are shown in Table 4.
TABLE 1 chemical composition of the smelt (wt%)
Examples C Si Mn P S Al
1 0.080 0.11 1.24 0.010 0.001 0.050
2 0.082 0.12 1.23 0.011 0.001 0.055
3 0.078 0.10 1.25 0.008 0.001 0.052
Examples Cr Ni Mo V Ti B
1 0.46 0.75 0.39 0.032 0.012 0.0015
2 0.47 0.73 0.40 0.035 0.011 0.0014
3 0.50 0.74 0.39 0.034 0.014 0.0016
TABLE 2 heating Process parameters
Examples Tapping temperature DEG C Heating time min
1 1228 226
2 1232 238
3 1222 221
TABLE 3 Heat treatment Process parameters
Examples Quenching temperature DEG C Holding time min Tempering temperature DEG C Holding time min
1 908 31 622 51
2 911 33 619 50
3 913 32 621 53
TABLE 4 mechanical properties of steel plates for thick gauge, high strength and high toughness structures
Figure BDA0003255174590000061
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (5)

1. The steel plate for the thick-specification high-strength high-toughness structure is characterized by comprising the following chemical components in percentage by mass: c: 0.07 to 0.09%, Si: 0.05-0.15%, Mn: 1.20-1.30%, P: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, Cr: 0.40-0.60%, Ni: 0.65-0.85%, Mo: 0.30-0.50%, Ti: 0.010-0.020%, V: 0.030-0.040%, B: 0.0010-0.0020%, Al: 0.030 to 0.060%, and the balance Fe and inevitable impurities, wherein the mass fraction is 100%.
2. The steel plate for thick-gauge high-strength high-toughness structures according to claim 1, characterized by comprising the following chemical components in percentage by mass: c: 0.080%, Si: 0.11%, Mn: 1.24%, P: 0.010%, S: 0.001%, Cr: 0.46%, Ni: 0.75%, Mo: 0.39%, Ti: 0.012%, V: 0.032%, B: 0.0015%, Al: 0.050%, and the balance of Fe and inevitable impurities, wherein the mass fraction is 100%.
3. The steel plate for thick-gauge high-strength high-toughness structures according to claim 1, characterized by comprising the following chemical components in percentage by mass: c: 0.082%, Si: 0.12%, Mn: 1.23%, P: 0.011%, S: 0.001%, Cr: 0.47%, Ni: 0.73%, Mo: 0.40%, Ti: 0.011%, V: 0.035%, B: 0.0014%, Al: 0.055 percent, the balance of Fe and inevitable impurities, and the mass fraction is 100 percent.
4. The steel plate for thick-gauge high-strength high-toughness structures according to claim 1, characterized by comprising the following chemical components in percentage by mass: c: 0.078%, Si: 0.10%, Mn: 1.25%, P: 0.008%, S: 0.001%, Cr: 0.50%, Ni: 0.74%, Mo: 0.39%, Ti: 0.014%, V: 0.034%, B: 0.0016%, Al: 0.052 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities accounting for 100 percent of the total weight.
5. The method for preparing a steel plate for thick gauge, high strength and high toughness structure according to claim 1, comprising:
(1) pretreating molten iron: after the molten iron is subjected to desulfurization pretreatment, the content of S is less than or equal to 0.003 percent;
(2) converter steelmaking: the converter adopts low-sulfur scrap steel, nickel plates and other alloys are added, and the tapping temperature is more than or equal to 1620 ℃;
(3) LF refining: argon is blown in the whole process, the formation time of white slag is guaranteed (more than or equal to 15min), and then ferrochrome and ferromolybdenum are added to adjust the components;
(4) RH refining: adding ferrovanadium, ferrotitanium, ferroboron and other alloys, feeding calcium-silicon wire, and soft blowing time after wire feeding is more than or equal to 10 min;
(5) continuous casting: electromagnetic stirring and soft reduction are adopted, the pulling speed is controlled to be 0.80-1.2 m/min, and the quality of a casting blank is ensured;
(6) a heating process: cold loading the plate blank into a furnace, wherein the time of the plate blank in the furnace is 180-240 min, and the discharging temperature is 1220 +/-20 ℃;
(7) the hot rolling process comprises the following steps: rolling the casting blank to a target thickness by adopting multiple passes, wherein widening rolling is adopted for rough rolling, so that the anisotropy of the steel plate is improved, and the transverse and longitudinal properties tend to be consistent; the finish rolling temperature is controlled to be 840 +/-15 ℃, and the finish rolling temperature Tf meets the following requirements: ar3 is more than Tf and less than Tnr, so that the plate blank is rolled in a completely non-recrystallized austenite region, austenite grains and a cooled structure can be refined, the structure after heat treatment is further improved, the toughness of the steel plate is improved, and the final cooling temperature is 650 +/-15 ℃;
(8) off-line quenching: setting the quenching heating temperature according to the austenite transformation finishing temperature Ac3+ (30-50) DEG C, setting the temperature to be 910 +/-10 ℃, and keeping the temperature of the steel plate core for 30min after the steel plate core reaches the quenching temperature;
(9) tempering: the tempering temperature is 620 +/-10 ℃, and the temperature of the steel plate is kept for 50min after reaching the tempering temperature.
CN202111057284.4A 2021-09-09 2021-09-09 Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof Pending CN113930671A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111057284.4A CN113930671A (en) 2021-09-09 2021-09-09 Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111057284.4A CN113930671A (en) 2021-09-09 2021-09-09 Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof

Publications (1)

Publication Number Publication Date
CN113930671A true CN113930671A (en) 2022-01-14

Family

ID=79275530

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111057284.4A Pending CN113930671A (en) 2021-09-09 2021-09-09 Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113930671A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115354127A (en) * 2022-05-06 2022-11-18 包头钢铁（集团）有限责任公司 Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate
CN115786820A (en) * 2022-11-29 2023-03-14 南京钢铁股份有限公司 Manufacturing method of P690QL2 marine storage tank steel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017002332A (en) * 2015-06-04 2017-01-05 新日鐵住金株式会社 High strength steel sheet excellent in processability and manufacturing method therefor
CN112813344A (en) * 2020-12-28 2021-05-18 包头钢铁（集团）有限责任公司 High-strength high-toughness easy-to-weld structural steel plate with yield strength of 620MPa and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017002332A (en) * 2015-06-04 2017-01-05 新日鐵住金株式会社 High strength steel sheet excellent in processability and manufacturing method therefor
CN112813344A (en) * 2020-12-28 2021-05-18 包头钢铁（集团）有限责任公司 High-strength high-toughness easy-to-weld structural steel plate with yield strength of 620MPa and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115354127A (en) * 2022-05-06 2022-11-18 包头钢铁（集团）有限责任公司 Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate
CN115786820A (en) * 2022-11-29 2023-03-14 南京钢铁股份有限公司 Manufacturing method of P690QL2 marine storage tank steel
CN115786820B (en) * 2022-11-29 2023-12-15 南京钢铁股份有限公司 Manufacturing method of P690QL2 marine storage tank steel

Similar Documents

Publication Publication Date Title
CN111440996B (en) 6-8 mm TMCP (thermal mechanical control processing) on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate and production method thereof
CN110184525B (en) High-strength Q500GJE quenched and tempered steel plate for building structure and manufacturing method thereof
CN112095046B (en) Ultrahigh-strength cold-rolled DH1180 steel and preparation method thereof
CN112048675A (en) Low-yield-ratio granular bainite high-strength steel plate used in low-temperature environment and manufacturing method thereof
CN104694822A (en) High-strength hot rolled steel plate with 700 MPa grade yield strength and manufacturing method thereof
CN112813344B (en) High-strength high-toughness easy-to-weld structural steel plate with yield strength of 620MPa and preparation method thereof
CN103320701B (en) A kind of ferrite-bainite AHSS plate and manufacture method thereof
CN110129673B (en) 800 MPa-grade high-strength-ductility Q & P steel plate and preparation method thereof
CN103014545B (en) High-strength steel plate with 900 Mpa-level yield strength and preparation method of steel plate
CN107747039A (en) A kind of high reaming performance cold-rolled biphase steel and preparation method thereof
CN113930671A (en) Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof
CN111647805B (en) Axle housing steel with yield strength of 600MPa after hot forming, preparation method thereof and axle housing
CN105063311A (en) Processing method for improving surface quality of TRIP steel
CN115491605B (en) Bainite steel for hot forging, process, device and system for manufacturing hot forged parts
CN114000053B (en) Hot-rolled steel sheet and method for producing same
CN113604736B (en) High-strength medium plate with yield strength of 800MPa and preparation method thereof
CN114807780A (en) 600 MPa-grade steel for automobile axle housing for hot stamping and production method thereof
CN111705270B (en) Preparation method of 800 MPa-grade low-temperature-resistant high-strength steel
CN115354127A (en) Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate
CN113403545A (en) High-hole-expansibility DH1180MPa cold-rolled continuous-annealing steel plate and preparation method thereof
CN112795837B (en) 1300Mpa high-toughness cold-formed steel plate and production method thereof
CN113528981B (en) 2000 MPa-level steel plate for protection and preparation method thereof
CN114045440B (en) High-strength high-plasticity hot forming steel with oxidation resistance for automobile and hot forming process
CN116334494A (en) 5-10 mmTMCP (thermal mechanical control process) high-strength high-low-temperature toughness Q620E steel plate and preparation method thereof
CN118241115A (en) Steel plate for high-strength high-hardness armor protection and production method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination