CN113403460A - Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage - Google Patents

Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage Download PDF

Info

Publication number
CN113403460A
CN113403460A CN202110591550.5A CN202110591550A CN113403460A CN 113403460 A CN113403460 A CN 113403460A CN 202110591550 A CN202110591550 A CN 202110591550A CN 113403460 A CN113403460 A CN 113403460A
Authority
CN
China
Prior art keywords
rolling
temperature
rare earth
less
q450ewr1
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
CN202110591550.5A
Other languages
Chinese (zh)
Inventor
黄利
王栋
王少炳
董丽丽
刘妍
杨源远
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 CN202110591550.5A priority Critical patent/CN113403460A/en
Publication of CN113403460A publication Critical patent/CN113403460A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/18—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

Abstract

The invention discloses a preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriages, which comprises the following steps: the method comprises the steps of adopting a continuous casting blank added with rare earth as a hot rolling raw material, heating the casting blank at 11950-1250 ℃, keeping the heating time in a furnace at 175-235 min, removing scales by using high-pressure water, carrying out rough rolling by using an E1R1 and E2R2 rough rolling machine, carrying out rough rolling at the beginning of the rough rolling at a temperature of more than or equal to 1070 ℃, carrying out 7-frame hot continuous rolling finish rolling at a temperature of more than or equal to 955 ℃, carrying out finish rolling at a temperature of 860-905 ℃, cooling by adopting a dense laminar flow, cooling at a speed of more than or equal to 12 ℃/S, coiling at a temperature of 610-660 ℃, and enabling the thickness of a steel strip to be less than or equal to 18 mm. The invention aims to provide a preparation method of rare earth treated low-temperature resistant steel Q450EWR1 for railway carriages, so that the steel plate has excellent low-temperature toughness and the service life of the product is prolonged.

Description

Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage
Technical Field
The invention relates to the technical field of metallurgical materials, in particular to a preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriages.
Background
Along with the development of national energy transportation, the requirement of high-cold low-temperature energy transportation is increasing day by day, and the development requirements of lightening the self weight of a railway wagon and improving the load capacity require that a steel plate has excellent low-temperature resistance and corrosion resistance, and simultaneously has high strength, high toughness, excellent cold forming performance and welding performance, and the price is relatively stable. The Q450EWR1 high-corrosion-resistance weathering steel is mainly applied to a C80E novel universal open wagon. Compared with Q450NQR1 high-strength weathering steel mainly adopted by C70 type universal open trucks, the yield strength grades are 450MPa, but the-60 ℃ low-temperature impact performance of Q450EWR1 is improved by nearly 30 percent compared with Q450NQR1, thereby meeting the transportation requirements of coal, wood and other materials in alpine regions. The C80E adopts Q450NQR1 low-temperature resistant weathering steel, so that the low-temperature resistance is enhanced, the service life is prolonged, and benefits are created. The load capacity of the C80E universal open wagon is increased by 14.3 percent compared with that of a 70-ton universal open wagon and by 33 percent compared with that of a 60-ton universal open wagon.
Disclosure of Invention
The invention aims to provide a preparation method of rare earth treated low-temperature resistant steel Q450EWR1 for railway carriages, so that the steel plate has excellent low-temperature toughness and the service life of the product is prolonged.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of rare earth treated low-temperature resistant steel Q450EWR1 for railway carriages comprises the following steps: the method comprises the following steps of (1) heating a continuous casting slab added with rare earth serving as a hot rolling raw material by using a stepping heating furnace, descaling by using high-pressure water, carrying out hot continuous rolling and finish rolling by using an E1R1 roughing mill, an E2R2 roughing mill and a 7-stand, carrying out dense laminar cooling and coiling to finally obtain the high corrosion-resistant steel for the railway carriage;
wherein: heating the casting blank at 11950-1250 ℃, keeping the furnace time at 175-235 min, descaling by high-pressure water, roughly rolling by using an E1R1 and E2R2 rough rolling mill, wherein the initial rolling temperature of rough rolling is not less than 1070 ℃, carrying out 7-frame hot continuous rolling and finish rolling, wherein the initial rolling temperature of finish rolling is not less than 955 ℃, the finish rolling temperature is 860-905 ℃, cooling by adopting a dense laminar flow, the cooling speed is not less than 12 ℃/S, the coiling temperature is 610-660 ℃, and the thickness of the steel strip is not more than 18 mm.
Further, the hot rolling raw material comprises the following components in percentage by mass: c: 0.03 to 0.07%, Si: 0.14 to 0.48%, Mn: 0.35-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Cu: 0.25-0.55%, Cr: 3.0-5.5%, Ni: 0.10-0.65%, N is less than or equal to 0.003%, O is less than or equal to 0.002%, RE: not less than 0.0015%, and the balance of iron and other inevitable impurities.
Further, the hot rolling raw material comprises the following components in percentage by mass: c: 0.05%, Si: 0.28%, Mn: 0.75%, P: 0.012%, S: 0.004%, Cu: 0.35%, Cr: 3.72%, Ni: 0.40%, N: 0.0025%, O: 0.0012 percent, 0.0030 percent of RE and the balance of iron and other inevitable impurities.
Further, the hot rolling raw material comprises the following components in percentage by mass: c: 0.04%, Si: 0.31%, Mn: 1.10%, P: 0.011%, S: 0.002%, Cu: 0.42%, Cr: 3.85%, Ni: 0.45%, N: 0.0028%, O: 0.0010 percent, 0.0050 percent of RE and the balance of iron and other inevitable impurities.
Compared with the prior art, the invention has the beneficial technical effects that:
rare earth is added into the steel, the content of O, N is low, the high corrosion-resistant steel for the railway carriage is produced by heating, descaling, rough rolling, finish rolling, cooling and coiling the continuous casting slab, and the average impact energy at the low temperature of minus 60 ℃ is more than or equal to 300J when the thickness of the steel strip is less than or equal to 18 mm.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows the microstructure of a steel strip according to example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The chemical components of the continuous casting slab are as follows:
table 1 continuous casting billet chemical composition units: is based on
C Si Mn P S Cr Cu Ni O N RE
0.05 0.28 0.75 0.012 0.004 3.72 0.35 0.40 0.0012 0.0025 0.0030
Smelting and continuous casting: and (3) carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization by adopting a top-bottom combined blown converter, carrying out LF external refining, and carrying out continuous casting.
Heating and rolling: the heating temperature is 1220 ℃, the furnace time is 192min, the rough rolling of an E1R1 and E2R2 rough rolling mill is carried out after high-pressure water descaling, the initial rolling temperature of the rough rolling is 1105 ℃, the 7-stand hot continuous rolling finish rolling is carried out, the initial rolling temperature of the finish rolling is 968 ℃, the finish rolling temperature is 879 ℃, the cooling speed is 16 ℃/S, the coiling temperature is 635 ℃, and the thickness of the steel strip is 10 mm.
TABLE 2 Steel strip Low temperature impact test results
Figure BDA0003089762050000031
Example 2
The chemical components of the continuous casting slab are as follows:
table 4 continuous casting billet chemical composition units: is based on
C Si Mn P S Cr Cu Ni O N RE
0.04 0.31 1.0 0.011 0.002 3.850 0.42 0.45 0.0010 0.0028 0.0050
Smelting and continuous casting: and (3) carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization by adopting a top-bottom combined blown converter, carrying out LF external refining, and carrying out continuous casting.
The heating temperature is 1230 ℃, the furnace time is 205min, the rough rolling is carried out by an E1R1 rough rolling mill and an E2R2 rough rolling mill after the high-pressure water descaling, the initial rolling temperature of the rough rolling is 1118 ℃, the 7-stand hot continuous rolling finish rolling is carried out, the initial rolling temperature of the finish rolling is 980 ℃, the final rolling temperature is 882 ℃, the cooling speed is 17 ℃/S, the coiling temperature is 660 ℃, and the thickness of the steel strip is 12 mm.
TABLE 3 Steel strip Low temperature impact test results
Figure BDA0003089762050000041
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 (4)

1. A preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriages is characterized by comprising the following steps: the method comprises the following steps of (1) heating a continuous casting slab added with rare earth serving as a hot rolling raw material by using a stepping heating furnace, descaling by using high-pressure water, carrying out hot continuous rolling and finish rolling by using an E1R1 roughing mill, an E2R2 roughing mill and a 7-stand, carrying out dense laminar cooling and coiling to finally obtain the high corrosion-resistant steel for the railway carriage;
wherein: heating the casting blank at 11950-1250 ℃, keeping the furnace time at 175-235 min, descaling by high-pressure water, roughly rolling by using an E1R1 and E2R2 rough rolling mill, wherein the initial rolling temperature of rough rolling is not less than 1070 ℃, carrying out 7-frame hot continuous rolling and finish rolling, wherein the initial rolling temperature of finish rolling is not less than 955 ℃, the finish rolling temperature is 860-905 ℃, cooling by adopting a dense laminar flow, the cooling speed is not less than 12 ℃/S, the coiling temperature is 610-660 ℃, and the thickness of the steel strip is not more than 18 mm.
2. The method for preparing the rare earth treated low temperature resistant steel Q450EWR1 for railway carriages as claimed in claim 1, wherein the weight fraction of the hot rolling raw material components is as follows: c: 0.03 to 0.07%, Si: 0.14 to 0.48%, Mn: 0.35-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Cu: 0.25-0.55%, Cr: 3.0-5.5%, Ni: 0.10-0.65%, N is less than or equal to 0.003%, O is less than or equal to 0.002%, RE: not less than 0.0015%, and the balance of iron and other inevitable impurities.
3. The method for preparing the rare earth treated low temperature resistant steel Q450EWR1 for railway carriages as claimed in claim 2, wherein the weight fraction of the hot rolling raw material components is as follows: c: 0.05%, Si: 0.28%, Mn: 0.75%, P: 0.012%, S: 0.004%, Cu: 0.35%, Cr: 3.72%, Ni: 0.40%, N: 0.0025%, O: 0.0012 percent, 0.0030 percent of RE and the balance of iron and other inevitable impurities.
4. The method for preparing the rare earth treated low temperature resistant steel Q450EWR1 for railway carriages as claimed in claim 2, wherein the weight fraction of the hot rolling raw material components is as follows: c: 0.04%, Si: 0.31%, Mn: 1.10%, P: 0.011%, S: 0.002%, Cu: 0.42%, Cr: 3.85%, Ni: 0.45%, N: 0.0028%, O: 0.0010 percent, 0.0050 percent of RE and the balance of iron and other inevitable impurities.
CN202110591550.5A 2021-05-28 2021-05-28 Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage Pending CN113403460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110591550.5A CN113403460A (en) 2021-05-28 2021-05-28 Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110591550.5A CN113403460A (en) 2021-05-28 2021-05-28 Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage

Publications (1)

Publication Number Publication Date
CN113403460A true CN113403460A (en) 2021-09-17

Family

ID=77675033

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110591550.5A Pending CN113403460A (en) 2021-05-28 2021-05-28 Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage

Country Status (1)

Country Link
CN (1) CN113403460A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115505856A (en) * 2022-10-12 2022-12-23 包头钢铁（集团）有限责任公司 Preparation method of rare earth treated low-yield-ratio steel Q350EWR1 for railway carriage
CN115927954A (en) * 2022-11-02 2023-04-07 包头钢铁（集团）有限责任公司 Method for improving impact toughness of weathering resistant steel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014114160A1 (en) * 2013-01-24 2014-07-31 宝山钢铁股份有限公司 High corrosion resistance and high strength weathering steel plate containing aluminium and manufacturing method therefor
CN107557698A (en) * 2017-08-02 2018-01-09 包头钢铁（集团）有限责任公司 Highly corrosion resistant type railway compartment steel of RE-treated and preparation method thereof
CN109576576A (en) * 2018-11-22 2019-04-05 包头钢铁（集团）有限责任公司 A kind of railcar of rare earth treatment Q450NQR1 fashioned iron and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014114160A1 (en) * 2013-01-24 2014-07-31 宝山钢铁股份有限公司 High corrosion resistance and high strength weathering steel plate containing aluminium and manufacturing method therefor
CN107557698A (en) * 2017-08-02 2018-01-09 包头钢铁（集团）有限责任公司 Highly corrosion resistant type railway compartment steel of RE-treated and preparation method thereof
CN109576576A (en) * 2018-11-22 2019-04-05 包头钢铁（集团）有限责任公司 A kind of railcar of rare earth treatment Q450NQR1 fashioned iron and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
黄利;陈林;: "铁路货车用钢Q450NQR1研究与试制", 包钢科技, no. 05, pages 42 - 44 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115505856A (en) * 2022-10-12 2022-12-23 包头钢铁（集团）有限责任公司 Preparation method of rare earth treated low-yield-ratio steel Q350EWR1 for railway carriage
CN115927954A (en) * 2022-11-02 2023-04-07 包头钢铁（集团）有限责任公司 Method for improving impact toughness of weathering resistant steel

Similar Documents

Publication Publication Date Title
CN111378896B (en) High-strength weather-resistant steel plate for building bridge and manufacturing method thereof
CN101153371B (en) High-strength cold-formed hot continuous rolled steel plate and method of preparing the same
CN110983155A (en) Rare earth treated corrosion-resistant steel belt for railway carriage and preparation method thereof
CN103114257B (en) Acid-washing-free high-strength crossbeam steel with stable oxide layer and preparation method of steel
CN110205559B (en) Axle housing steel with excellent surface quality and tensile strength of more than or equal to 510MPa and production method thereof
CN109576576A (en) A kind of railcar of rare earth treatment Q450NQR1 fashioned iron and preparation method thereof
CN113403460A (en) Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage
CN101413091B (en) Novel easy-to-cut stainless steel 303B and manufacturing method thereof
CN109609845A (en) A kind of 500MPa grades of weathering steel and its production method
CN111979479A (en) Hot-rolled steel strip with thickness of 10.0-14.0 mm, low temperature resistance and high toughness for Q345NQR2 railway carriage
CN111118257A (en) Heat treatment method for improving impact toughness of boron-containing thick hydroelectric steel plate core
CN102876982A (en) Axle steel and its manufacturing method
CN109518090B (en) Bainite steel for frog point rail and manufacturing method thereof
CN109112393B (en) Anti-riot steel plate for 900 MPa-grade ATM and manufacturing method thereof
CN113913691A (en) Preparation method of high-content rare earth treated container SPA-H
CN111593182B (en) Production method of corrosion-resistant Baima complex phase structure steel rail
CN103866190A (en) Low-brittleness 650MPa-grade steel for automotive beams and preparation method thereof
CN114774777A (en) Preparation method of rare earth treated weathering structural steel Q355NH
CN115125448A (en) Non-quenched and tempered steel for cold machining of hydraulic piston rod and preparation method
CN115044826A (en) 410 ferritic stainless steel
CN103866189B (en) Low fragility 800MPa level steel for automobile crossbeam and manufacture method thereof
CN113930658A (en) Production process of small low-alloy Q355B angle steel
CN103849811B (en) Low fragility 750MPa level steel for automobile crossbeam and manufacture method thereof
CN111809109A (en) Hot-bending elbow steel strip with yield strength of more than 360MPa and preparation method thereof
CN110616375A (en) Niobium-vanadium-containing 550 MPa-grade thick weathering steel 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