CN111519096A - Rare earth-containing Q890CF high-strength steel plate and manufacturing method thereof - Google Patents

Rare earth-containing Q890CF high-strength steel plate and manufacturing method thereof Download PDF

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CN111519096A
CN111519096A CN202010395805.6A CN202010395805A CN111519096A CN 111519096 A CN111519096 A CN 111519096A CN 202010395805 A CN202010395805 A CN 202010395805A CN 111519096 A CN111519096 A CN 111519096A
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equal
steel plate
temperature
rolling
q890cf
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勤牧
杨雄
杨维宇
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group 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
    • 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
    • C21D8/0221—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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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 discloses a Q890CF high-strength steel plate containing rare earth and a manufacturing method thereof, belonging to the field of production technology development of high-strength steel. The steel plate comprises the following chemical components in percentage by mass: 0.9-0.12% of C, 0.30-0.40% of Si, 1.7-2.0% of Mn, 0.2-0.60% of Alt, 0.35-0.55% of Cr, 0.25-0.40% of Mo, 0.2-0.4% of Ni, 0.2-0.4% of Cu, 0.04-0.07% of Nb, less than or equal to 0.001% of B, 0.04-0.06% of V, 0.01-0.03% of Ti, less than or equal to 0.013% of P, less than or equal to 0.008% of S, less than or equal to 0.004% of rare earth Ce, and the balance of Fe and inevitable impurities. The obtained Q890CF high-strength steel plate has excellent mechanical properties.

Description

Rare earth-containing Q890CF high-strength steel plate and manufacturing method thereof
Technical Field
The invention belongs to the field of high-strength steel production technology development, and particularly relates to a Q890CF high-strength steel plate containing rare earth and a preparation method thereof.
Background
In recent years, as the field of construction machines is increasing in size and weight, demands for low cost and easy welding are required while satisfying high load conditions. However, the increase of the steel strength often brings the reduction of toughness, the high-strength structural steel often needs good welding performance, and in order to prevent the formation of welding cold cracks, the steel plate needs to be pre-heated before welding, which causes serious energy consumption and poor working condition environment for production and manufacturing and other links, and insufficient pre-heating can also cause unstable performance of a welding joint and influence the safe service of a structural member. Therefore, the development of the low-crack-sensitivity high-strength steel welded under the condition of no preheating or low preheating is an excellent solution for improving the production efficiency, reducing the cost and improving the working condition environment.
At present, some technologies related to steel plates with the same level and low welding crack sensitivity exist, however, TMCP or DQ technology is adopted in the technologies for production, although the production mode is widely applied to high-strength steel, the requirements on production equipment of steel enterprises are high, the plate shape control is difficult, and the machining performance is poor compared with that of quenched and tempered steel. The content of Mo, B and other alloy elements in individual technologies is high, the production cost is increased, and the defects of slab cracking and the like are easily caused.
Disclosure of Invention
In view of one or more of the problems in the prior art, one aspect of the present invention provides a rare earth-containing Q890CF high-strength steel sheet, which comprises the following chemical components in percentage by mass: 0.9-0.12% of C, 0.30-0.40% of Si, 1.7-2.0% of Mn, 0.2-0.60% of Alt, 0.35-0.55% of Cr, 0.25-0.40% of Mo, 0.2-0.4% of Ni, 0.2-0.4% of Cu, 0.04-0.07% of Nb, less than or equal to 0.001% of B, 0.04-0.06% of V, 0.01-0.03% of Ti, less than or equal to 0.013% of P, less than or equal to 0.008% of S, less than or equal to 0.004% of rare earth Ce, and the balance of Fe and inevitable impurities.
The mechanical properties of the Q890CF high-strength steel plate containing rare earth meet the following requirements: the yield strength (Rp0.2) is more than or equal to 890MPa, the tensile strength (Rm) is more than or equal to 1100MPa, the yield ratio is less than or equal to 0.81, the elongation (A) is more than or equal to 15 percent, the impact energy (Akv) at the temperature of minus 20 ℃ is more than or equal to 47J, and the welding crack sensitivity index Pcm value is not more than 0.28 percent.
In another aspect, the present invention provides a method for manufacturing the above-mentioned high strength Q890CF steel sheet containing rare earth, comprising the steps of:
1) smelting: adding prepared high-quality scrap steel and other calculated and prepared alloys into a vacuum smelting furnace according to the chemical components of the Q890CF hot rolled steel plate, starting to melt and smelt after vacuumizing, and casting into steel ingots;
2) pretreatment: the steel ingot is put into a high-temperature resistance furnace and heated to 1200 plus or minus 10 ℃, and the total in-furnace time is more than or equal to 240 min;
3) hot rolling: two-stage rolling control is adopted:
the initial rolling temperature of rough rolling is 1050-1120 ℃, multi-pass rolling is carried out, the cumulative pass reduction rate is 45-60%, the final rolling temperature is 1000-1080 ℃, and the thickness of an intermediate blank is 40-75 mm;
the initial rolling temperature of finish rolling is 900-960 ℃, multi-pass rolling is carried out, the cumulative pass reduction rate is 60-80%, the final rolling temperature is not lower than 780 ℃, and the thickness of the obtained steel plate is 12-25 mm; adopting a laminar flow accelerated cooling mode, wherein the initial cooling temperature of the steel plate is not lower than 750 ℃, the cooling speed is 10-15 ℃/s, and the final cooling temperature is controlled to be 350-455 ℃; the finish rolling temperature of finish rolling is not lower than 780 ℃ because too low finish rolling temperature can obviously increase the entanglement dislocation density generated by mechanical deformation in austenite, which is not beneficial to improving the toughness, and in addition, too low finish rolling temperature can form strain induced ferrite structure, thus reducing the strength;
4) and (3) heat treatment: the heating temperature of the quenching process is 930 +/-10 ℃, the heat preservation time is more than or equal to 40min, the tempering temperature is 550-600 ℃, the furnace time is more than or equal to 50min, and then the quenching process is air-cooled to the room temperature to obtain the rare earth-containing Q890CF high-strength steel plate; the tempering temperature is 550-600 ℃, and the steel plate can be ensured to have good matching of strength and impact toughness.
Based on the excellent characteristics and microalloying technology of rare earth, the manufacturing method of the Q890CF high-strength steel plate containing rare earth provided by the technical scheme is based on the excellent characteristics and microalloying technology of rare earth, reasonable chemical components are designed, and a Q890CF high-strength steel plate with high strength and good low-temperature toughness is obtained by controlling rolling and off-line quenching and tempering processes in two stages, wherein the mechanical properties of the steel plate meet the following requirements: the yield strength (Rp0.2) is more than or equal to 890MPa, the tensile strength (Rm) is more than or equal to 1100MPa, the yield ratio is less than or equal to 0.81, the elongation (A) is more than or equal to 15 percent, and the impact energy (Akv) at the temperature of minus 20 ℃ is more than or equal to 47J. The Q890CF high-strength steel plate has the welding crack sensitivity index Pcm value of not more than 0.28 percent, has low welding crack sensitivity, and can meet the welding requirement of large engineering structural members.
Drawings
FIG. 1 is a metallographic structure diagram of a Q890CF high-strength steel sheet obtained in example 1 of the present invention.
Detailed Description
The invention provides a novel component design for solving the problems of weldability of a high-strength steel plate and safety service performance of a welding product under the development requirement of structural steel for welding, the novel component design has low carbon equivalent and low Pcm value, the low-welding crack sensitivity high-strength steel plate with excellent comprehensive performance is prepared by adding rare earth elements, and the provided method can replace partial alloy elements by using rare earth, reduce the cost, ensure the mechanical property of steel and fully utilize rare earth resources.
The present invention will be described in detail below with reference to specific examples. These examples are only for the purpose of better understanding of the present invention and do not limit the content of the present invention in any way.
Example 1
Smelting according to the chemical components shown in the following table 1 (a laboratory 25kg vacuum smelting furnace), casting into steel ingots, heating the steel ingots to 1200 ℃, and preserving the heat for 60 minutes, wherein the total in-furnace time is more than or equal to 240 min. The first-stage rolling is carried out on an experimental rolling mill, the rolling temperature is 1061 ℃, when the thickness of a rolled piece is 42mm, the temperature is kept to 921 ℃ on a roller way, and then the second-stage rolling, namely the rolling in an austenite non-recrystallization area, is carried out. The finishing temperature is 850 ℃, and the thickness of the finished steel strip is 12 mm. After rolling, the steel strip enters a laminar cooling device, is cooled to 455 ℃ at the speed of 10 ℃/s, and is subjected to quenching and tempering heat treatment, wherein the quenching heating temperature is 930 ℃, the temperature is kept for 40min, and the tempering temperature is 575 ℃ and the furnace time is 50 min.
Example 2
The embodiment is the same as the embodiment 1, wherein the heating temperature is 1200 ℃, the heat preservation time is 60 minutes, the total furnace time is more than or equal to 240 minutes, the initial rolling temperature of the first stage rolling is 1053 ℃, the thickness of the intermediate billet is 42mm, the initial rolling temperature of the second stage rolling is 924 ℃, the final rolling temperature is 831 ℃, and the thickness of the finished steel strip is 12 mm. After rolling, the steel strip enters a laminar cooling device, is cooled to 360 ℃ at the speed of 10 ℃/s, and is subjected to quenching and tempering heat treatment, the quenching heating temperature is 930 ℃, the temperature is kept for 40min, and the tempering temperature is 575 ℃ and the furnace time is 50 min.
Table 1: chemical composition (wt%) of examples 1 to 2
Examples C Si Mn P S Cr Ni Mo Nb
1 0.10 0.36 1.83 0.013 0.002 0.43 0.31 0.30 0.050
2 0.10 0.38 1.92 0.013 0.002 0.42 0.31 0.30 0.046
Examples V Ti Alt Cu B RE Ceq Pcm
1 0.053 0.016 0.34 0.32 0.001 0.0008 0.60 0.28
2 0.056 0.017 0.38 0.32 0.001 0.0008 0.62 0.28
Mechanical property tests were performed on the high strength steel plate Q890CF obtained in example 1 and example 2, and the test results are shown in table 2, and fig. 1 shows the metallographic structure of the high strength steel plate Q890CF obtained in example 1.
Table 2: mechanical Properties of the Steel strips of examples 1-2
Figure BDA0002487483250000031
From the data in the table 2, the mechanical properties of the rare earth-containing Q890CF high-strength steel plate provided by the invention meet the following requirements: the yield strength (Rp0.2) is more than or equal to 890MPa, the tensile strength (Rm) is more than or equal to 1100MPa, the yield ratio is less than or equal to 0.81, the elongation (A) is more than or equal to 15 percent, and the impact energy (Akv) at the temperature of minus 20 ℃ is more than or equal to 47J. The Q890CF high-strength steel plate has excellent mechanical properties and good welding performance.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. The Q890-890 CF high-strength steel plate containing rare earth is characterized in that the chemical components of the Q890-890 CF high-strength steel plate containing rare earth comprise the following components in percentage by mass: 0.9-0.12% of C, 0.30-0.40% of Si, 1.7-2.0% of Mn, 0.2-0.60% of Alt, 0.35-0.55% of Cr, 0.25-0.40% of Mo, 0.2-0.4% of Ni, 0.2-0.4% of Cu, 0.04-0.07% of Nb, less than or equal to 0.001% of B, 0.04-0.06% of V, 0.01-0.03% of Ti, less than or equal to 0.013% of P, less than or equal to 0.008% of S, less than or equal to 0.004% of rare earth Ce, and the balance of Fe and inevitable impurities.
2. The rare-earth-containing Q890CF high-strength steel plate as claimed in claim 1, wherein the mechanical properties of said rare-earth-containing Q890CF high-strength steel plate are as follows: the yield strength (Rp0.2) is more than or equal to 890MPa, the tensile strength (Rm) is more than or equal to 1100MPa, the yield ratio is less than or equal to 0.81, the elongation (A) is more than or equal to 15 percent, the impact energy (Akv) at the temperature of minus 20 ℃ is more than or equal to 47J, and the welding crack sensitivity index Pcm value is not more than 0.28 percent.
3. The method for producing a high-strength steel sheet of Q890CF containing rare earth according to claim 1 or 2, comprising the steps of:
1) smelting: adding prepared high-quality scrap steel and other calculated and prepared alloys into a vacuum smelting furnace according to the chemical components of the Q890CF hot rolled steel plate, starting to melt and smelt after vacuumizing, and casting into steel ingots;
2) pretreatment: the steel ingot is put into a high-temperature resistance furnace and heated to 1200 plus or minus 10 ℃, and the total in-furnace time is more than or equal to 240 min;
3) hot rolling: two-stage rolling control is adopted:
the initial rolling temperature of rough rolling is 1050-1120 ℃, multi-pass rolling is carried out, the cumulative pass reduction rate is 45-60%, the final rolling temperature is 1000-1080 ℃, and the thickness of an intermediate blank is 40-75 mm;
the initial rolling temperature of finish rolling is 900-960 ℃, multi-pass rolling is carried out, the cumulative pass reduction rate is 60-80%, the final rolling temperature is not lower than 780 ℃, and the thickness of the obtained steel plate is 12-25 mm; adopting a laminar flow accelerated cooling mode, wherein the initial cooling temperature of the steel plate is not lower than 750 ℃, the cooling speed is 10-15 ℃/s, and the final cooling temperature is controlled to be 350-455 ℃;
4) and (3) heat treatment: the heating temperature of the quenching process is 930 +/-10 ℃, the heat preservation time is more than or equal to 40min, the tempering temperature is 550-600 ℃, the furnace time is more than or equal to 50min, and then the quenching process is air-cooled to the room temperature to obtain the Q890CF high-strength steel plate containing the rare earth.
CN202010395805.6A 2020-05-12 2020-05-12 Rare earth-containing Q890CF high-strength steel plate and manufacturing method thereof Pending CN111519096A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015200015A (en) * 2014-03-31 2015-11-12 Ｊｆｅスチール株式会社 Thick steel sheet excellent in wear resistance in high temperature environment
JP2016216810A (en) * 2015-05-26 2016-12-22 新日鐵住金株式会社 Low carbon steel sheet excellent in machinability and friction resistance after hardening and tempering and manufacturing method therefor
CN109594016A (en) * 2018-11-22 2019-04-09 包头钢铁（集团）有限责任公司 A kind of Q690CF high strength steel plate and preparation method thereof containing rare earth
CN110832098A (en) * 2017-07-07 2020-02-21 日本制铁株式会社 Hot-rolled steel sheet and method for producing same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015200015A (en) * 2014-03-31 2015-11-12 Ｊｆｅスチール株式会社 Thick steel sheet excellent in wear resistance in high temperature environment
JP2016216810A (en) * 2015-05-26 2016-12-22 新日鐵住金株式会社 Low carbon steel sheet excellent in machinability and friction resistance after hardening and tempering and manufacturing method therefor
CN110832098A (en) * 2017-07-07 2020-02-21 日本制铁株式会社 Hot-rolled steel sheet and method for producing same
CN109594016A (en) * 2018-11-22 2019-04-09 包头钢铁（集团）有限责任公司 A kind of Q690CF high strength steel plate and preparation method thereof containing rare earth

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Application publication date: 20200811