CN113828745B - Bloom continuous casting production method of high-strength steel for motor car brake disc - Google Patents

Bloom continuous casting production method of high-strength steel for motor car brake disc Download PDF

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Publication number
CN113828745B
CN113828745B CN202111010220.9A CN202111010220A CN113828745B CN 113828745 B CN113828745 B CN 113828745B CN 202111010220 A CN202111010220 A CN 202111010220A CN 113828745 B CN113828745 B CN 113828745B
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continuous casting
multiplied
bloom
crystallizer
less
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CN202111010220.9A
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CN113828745A (en
Inventor
吴建永
于湛
刘晓彬
李运辉
王国柱
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • 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
    • 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
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • 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
    • C22C38/44—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
    • 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 bloom continuous casting production method of high-strength steel for a motor car brake disc, which comprises the following chemical components in percentage by mass: c:0.15-0.20%, si:0.25-0.55%, mn:0.60-1.00%, P: less than or equal to 0.015%, S: less than or equal to 0.005 percent, cr:0.70-1.25%, mo:0.70-1.00%, ni:0.25-0.35%, V:0.10-0.30%, the balance being Fe and unavoidable impurities; the billet is produced by a large billet continuous casting machine with the section of 300-450 mm multiplied by 400-500 mm. The invention produces the continuous casting billet meeting the requirements through the control of the heat flow density of the continuous casting crystallizer, the cooling intensity and the specific water distribution of a secondary cooling area, and the parameters of electromagnetic stirring of the crystallizer, electromagnetic stirring at the tail end and soft reduction; the continuous casting production of the bloom can be realized, the casting blank has no surface cracks, the low-power center porosity and the center segregation are both less than 1.0 grade, and the casting blank has no center shrinkage cavity.

Description

Bloom continuous casting production method of high-strength steel for motor car brake disc
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a bloom continuous casting production method of high-strength steel for a motor car brake disc.
Background
High-speed train sets are increasingly receiving wide attention at home and abroad due to the advantages of high speed, large transportation capacity, low energy consumption, little pollution, strong environmental adaptability and the like. Under the high-speed braking working condition of a high-speed rail, along with the strong coupling action of thermal stress and mechanical stress, the brake disc is required to have good thermophysical and heat dissipation characteristics, excellent room-temperature and high-temperature comprehensive mechanical properties and strong environmental adaptability. Steel for bullet train brake discs requires high yield strength and high toughness, and a large amount of alloy elements need to be added. Because the alloy amount is large, the continuous casting production is adopted, the defects of casting blank surface cracks and casting blank low-power center segregation, center porosity and center shrinkage cavity of the casting blank are easy to generate, and the service performance of the product is influenced.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a bloom continuous casting production method of high-strength steel for a bullet train brake disc, which produces continuous casting billets meeting requirements through continuous casting crystallizer heat flow density control, cooling strength and specific water distribution of a secondary cooling area, electromagnetic stirring of a crystallizer, tail end electromagnetic stirring and soft reduction parameters.
The technical scheme is as follows: the invention discloses a bloom continuous casting production method of high-strength steel for a motor car brake disc, which comprises the following chemical components in percentage by mass: c:0.15-0.20%, si:0.25-0.55%, mn:0.60-1.00%, P: less than or equal to 0.015%, S: less than or equal to 0.005 percent, cr:0.70-1.25%, mo:0.70-1.00%, ni:0.25-0.35%, V:0.10-0.30%, the balance being Fe and unavoidable impurities; the billet is produced by a large billet continuous casting machine with the section of 300-450 mm multiplied by 400-500 mm.
Furthermore, the bloom drawing speed is 0.48-0.70 m/min, and the heat flow density of the crystallizer is 0.80-1.20 MW/m 2 。
Further, the total water amount of the secondary cooling area is 80-200L/min; the ratio of water to each zone is from 4 to 5, wherein the ratio of water to each zone is from 4.
Further, the crystallizer is electromagnetically stirred for 200 to 500A multiplied by 2Hz, the secondary cooling zone is electromagnetically stirred for 500 to 1000A multiplied by 8Hz, and the tail end is electromagnetically stirred for 500 to 1100A multiplied by 6Hz.
Furthermore, the solidification tail end is lightly pressed, and the total weight of the lightly pressed solidification tail end is 8-15 mm.
Has the beneficial effects that: compared with the prior art, the process method comprises the following steps: according to the invention, the continuous casting billet meeting the requirements is produced by controlling the heat flow density of the continuous casting crystallizer, distributing the cooling strength and specific water amount of a secondary cooling area, and carrying out electromagnetic stirring, tail end electromagnetic stirring and soft reduction parameters of the crystallizer; the continuous casting method can realize continuous casting production of large square billets, and the casting billets have no surface cracks, low-power center porosity and center segregation which are less than 1.0 grade and have no center shrinkage cavity.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A bloom continuous casting production method of high-strength steel for a bullet train brake disc comprises the following chemical components in percentage by mass: c:0.15%, si:0.25%, mn:0.60%, P:0.012%, S:0.003%, cr:0.70%, mo:0.70%, ni:0.25%, V:0.10%, the balance being Fe and unavoidable impurities; a large square billet continuous casting machine with the cross section of 300mm multiplied by 400mm is adopted for production.
Wherein:
the pulling speed is 0.70m/min, and the heat flow density of the crystallizer is 0.8MW/m2;
the total water amount of the secondary cooling zone is 200L/min, and the specific water amount of each zone is cooled by adopting a 5-zone;
the crystallizer is electromagnetically stirred for 200A multiplied by 2Hz, the secondary cooling zone is electromagnetically stirred for 500A multiplied by 8Hz, and the tail end is electromagnetically stirred for 500A multiplied by 6Hz;
and (3) lightly pressing the solidification tail end, wherein the total weight of the lightly pressed solidification tail end is 15mm.
The prepared casting blank has no surface cracks, low-power center porosity and center segregation which are less than 0.5 grade, and has no center shrinkage cavity.
Example 2
A bloom continuous casting production method of high-strength steel for a bullet train brake disc comprises the following chemical components in percentage by mass: c:0.18%, si:0.35%, mn:0.80%, P:0.014%, S:0.004%, cr:1.00%, mo:0.85%, ni:0.30%, V:0.20%, the balance being Fe and unavoidable impurities; the billet is produced by a bloom continuous casting machine with the section of 350mm multiplied by 450 mm.
Wherein:
the bloom drawing speed is 0.60m/min, the crystallizer heat flow density is 1.00MW/m 2 。
The total water quantity of the secondary cooling area is 150L/min; 4 cooling zones are adopted, wherein the ratio of water in each zone of 4 cooling zones is 3
The crystallizer is electromagnetically stirred for 350 Ax 2Hz, the secondary cooling area is electromagnetically stirred for 800 Ax 8Hz, and the tail end is electromagnetically stirred for 800 Ax 6Hz.
And lightly pressing the solidification tail end, wherein the total weight of the lightly pressed solidification tail end is 11mm.
The prepared casting blank has no surface cracks, low-power center porosity and center segregation which are less than 0.5 grade, and has no center shrinkage cavity.
Example 3
A bloom continuous casting production method of high-strength steel for a bullet train brake disc comprises the following chemical components in percentage by mass: c:0.20%, si:0.55%, mn:1.00%, P:0.015%, S:0.005%, cr:1.25%, mo:1.00%, ni:0.35%, V:0.30%, the balance being Fe and unavoidable impurities; the billet is produced by a bloom continuous casting machine with the section of 450mm multiplied by 500 mm.
Wherein:
the bloom drawing speed is 0.48m/min, the crystallizer heat flow density is 1.20MW/m 2 。
The total water amount of the secondary cooling area is 80L/min; 5 cooling zones are used, 5 zones cool each zone with a water ratio of 4.
The crystallizer is electromagnetically stirred for 500A multiplied by 2Hz, the secondary cooling zone is electromagnetically stirred for 1000A multiplied by 8Hz, and the tail end is electromagnetically stirred for 1100A multiplied by 6Hz.
And lightly pressing the solidification tail end, wherein the total amount of the lightly pressed solidification tail end is 8mm.
The prepared casting blank has no surface cracks, low-power center porosity and center segregation which are less than 0.5 grade, and has no center shrinkage cavity.

Claims (1)

1. A bloom continuous casting production method of high-strength steel for a motor car brake disc is characterized by comprising the following steps: the chemical components of the material comprise the following components in percentage by mass: c:0.15-0.20%, si:0.25-0.55%, mn:0.60-1.00%, P: less than or equal to 0.015%, S: less than or equal to 0.005 percent, cr:0.70-1.25%, mo:0.70-1.00%, ni:0.25-0.35%, V:0.10-0.30%, the balance being Fe and unavoidable impurities; producing by a bloom continuous casting machine with the cross section of 300-450mm multiplied by 400-500mm;
the drawing speed of the bloom is 0.48 to 0.70m/min, and the heat flux density of the crystallizer is 0.80 to 1.20MW/m 2 ；
The total water amount of the second cooling area is 80 to 200L/min; 4 or 5 cooling zones are adopted, wherein the ratio of water in each cooling zone in the 4 cooling zone is 3;
electromagnetically stirring the mixture in a crystallizer for 200 to 500A multiplied by 2Hz, electromagnetically stirring the mixture in a secondary cooling area for 500 to 1000A multiplied by 8Hz, and electromagnetically stirring the mixture at the tail end for 500 to 1100A multiplied by 6Hz;
and (3) under soft pressing of a solidification tail end, wherein the total amount under soft pressing is 8 to 15mm.
CN202111010220.9A 2021-08-31 2021-08-31 Bloom continuous casting production method of high-strength steel for motor car brake disc Active CN113828745B (en)

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CN115069995B (en) * 2022-07-11 2023-12-15 南京钢铁股份有限公司 Bloom continuous casting method of high-carbon high-manganese steel

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