CN110387551B - Process for producing 600 MPa-grade TRIP steel through acid rolling - Google Patents

Process for producing 600 MPa-grade TRIP steel through acid rolling Download PDF

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CN110387551B
CN110387551B CN201910723548.1A CN201910723548A CN110387551B CN 110387551 B CN110387551 B CN 110387551B CN 201910723548 A CN201910723548 A CN 201910723548A CN 110387551 B CN110387551 B CN 110387551B
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welding
trip steel
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rolled coil
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CN110387551A (en
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程晓杰
李振
姚舜
史静
齐春雨
柳智博
孔凡庆
陈甚超
宋浩源
马兵智
刘华赛
韩赟
孙建华
孙存友
曾卫仔
任君茹
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Beijing Shougang Cold Rolled Sheet Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/0236—Cold 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • C22C38/02—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling

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

Abstract

The invention relates to a process for producing 600 MPa-grade TRIP steel by acid rolling, which belongs to the field of steel smelting, and the process provided by the embodiment of the invention uses a hot-rolled coil as a raw material, and the hot-rolled coil is subjected to the working procedures of uncoiling, welding, stretching and straightening, acid washing, rolling and heat treatment in sequence to obtain 600 MPa-grade TRIP steel; in the acid washing, the acid washing temperature is 74-80 ℃, and the acid washing speed is 50-150 m/min; in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 70-220 m/min.

Description

Process for producing 600 MPa-grade TRIP steel through acid rolling
Technical Field
The invention belongs to the field of steel smelting, and particularly relates to a process for producing 600 MPa-grade TRIP steel by acid rolling.
Background
TRIP steel refers to ultra-high strength steel with increased plasticity caused by a martensitic transformation process that progresses gradually in the steel structure, and is also called transformation induced plasticity steel. The microstructure of the transformation induced plasticity steel consists of ferrite, bainite, retained austenite and a small amount of martensite, and the current transformation induced plasticity steel for the automobile comprises the following components: according to the development of automobile technology, the transformation induced plasticity steel for automobiles is required to have stronger mechanical property, however, the mechanical property of TRIP steel cannot be sufficiently improved by the existing acid rolling process (acid pickling five-frame cold continuous rolling), so that the TRIP steel with the strength reaching 6600MPa is manufactured.
Disclosure of Invention
In view of the above problems, the present invention has been made in order to provide a process for producing TRIP steel of grade 600MPa by acid rolling that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a process for producing 600 MPa-grade TRIP steel by acid rolling, which is characterized in that a hot-rolled coil is used as a raw material, and the hot-rolled coil is subjected to the working procedures of uncoiling, welding, stretching and straightening, acid pickling, rolling and heat treatment in sequence to obtain 600 MPa-grade TRIP steel;
in the acid washing, the acid washing temperature is 74-80 ℃, and the acid washing speed is 50-150 m/min;
in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 70-220 m/min.
Further, the hot-rolled coil comprises the following chemical elements in percentage by weight: c: 0.17-0.20%, Si: 0.12-0.16%, Mn: 1.4-1.65%, P is less than or equal to 0.020%, S is less than or equal to 0.007%, Alt: 1.0-1.2%, and the balance of Fe and inevitable impurity elements.
Further, the hot-rolled coil curling temperature is 610-650 ℃.
Further, the hot rolled coil structure is pearlite and ferrite.
Furthermore, the welding adopts laser welding, the welding power is 11000-12000w, the welding speed is 4-6m/min, and the wire feeding speed is 3-5 m/min.
Further, in the welding process, the welding seam annealing current is 150-180A, and the welding seam annealing temperature is 740-780 ℃.
Further, in the stretch straightening, the elongation is 0.5 to 0.8%, and the insertion amount of the bent unit is 6 to 30 mm.
Furthermore, the insertion amount of the bending unit is 18-30mm for No. 1 bending unit, 12-24mm for No. 2 bending unit and 6-15mm for No. 3 straightening unit.
Further, the five-rolling mill F1-F5 has the following rolling process parameters:
the pressed distribution rate is as follows in sequence: 35-60%, 32-40%, 17-26%, 18-22% and 0.4-2%;
the unit tension between the rolling mills is as follows in sequence: 50-70N/mm2，140-180N/mm2，160-200N/mm2，160-230N/mm2，180-250N/mm2，60-90N/mm2；
The bending force of the working roll is as follows in sequence: 500, 480, 520, 420, 480, 430, 480, 150, 260 KN.
Further, in the heat treatment, the annealing temperature is 720-820 ℃.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the process for producing the 600 MPa-grade TRIP steel by acid rolling, provided by the embodiment of the invention, the average value of the plate shape of the cold-hard coil is less than 2.0IU by the process control of the acid washing and rolling procedures, so that the industrial production of the 600 MPa-grade TRIP steel on the acid rolling production line is realized. By adjusting the element content, proper alloy elements are added on the basis of optimizing hot rolling and cold rolling processes, so that the high-strength automobile steel with good maintenance is obtained, and considerable economic benefit can be brought.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a metallographic microstructure of a TRIP steel in a 600MPa class after galvannealing according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the application provides a process for producing 600 MPa-grade TRIP steel by acid rolling, which is characterized in that a hot-rolled coil is used as a raw material, and the hot-rolled coil is subjected to uncoiling, welding, stretching and straightening, acid pickling, rolling and heat treatment in sequence to obtain 600 MPa-grade TRIP steel;
in the acid washing, the acid washing temperature is 74-80 ℃, and the acid washing speed is 50-150 m/min;
in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 70-220 m/min.
In the application, the hot-rolled coil comprises the following chemical elements in percentage by weight: c: 0.17-0.20%, Si: 0.12-0.16%, Mn: 1.4-1.65%, P is less than or equal to 0.020%, S is less than or equal to 0.007%, Alt: 1.0-1.2%, and the balance of Fe and inevitable impurity elements.
In the present application, the coiling temperature of the hot-rolled coil is 610-650 ℃.
In the present application, the hot rolled coil structure is pearlite and ferrite.
In the application, the welding adopts laser welding, the welding power is 11000-12000w, the welding speed is 4-6m/min, and the wire feeding speed is 3-5 m/min.
In the application, in the welding process, the welding seam annealing current is 150-180A, and the welding seam annealing temperature is 740-780 ℃.
In the present application, in the stretch straightening, the elongation is 0.5 to 0.8%, and the amount of insertion of the bent units is 6 to 30 mm.
In the application, the insertion amount of the bending unit is 18-30mm for No. 1 bending unit, 12-24mm for No. 2 bending unit and 6-15mm for No. 3 straightening unit.
In the application, the rolling process parameters of the five-rolling mill F1-F5 are as follows:
the pressed distribution rate is as follows in sequence: 35-60%, 32-40%, 17-26%, 18-22% and 0.4-2%;
the unit tension between the rolling mills is as follows in sequence: 50-70N/mm2，140-180N/mm2，160-200N/mm2，160-230N/mm2，180-250N/mm2，60-90N/mm2；
The bending force of the working roll is as follows in sequence: 500, 480, 520, 420, 480, 430, 480, 150, 260 KN.
In the heat treatment described herein, the annealing temperature is 720-820 ℃.
As can be seen from fig. 1, the 600MPa grade TRIP steel provided by the present application, after annealing by galvanizing, has a composition of granular bainite and residual austenite in addition to massive martensite on a ferrite matrix; the banded structure is obviously improved, the martensite island does not have obvious tempering decomposition, and the size of the martensite island is between 1 and 3 mu m; according to the low-Si AI-containing TRIP steel, Al is partially used for replacing Si, and good mechanical properties can be obtained under a continuous annealing process.
The present application will be described in detail with reference to specific examples.
Example 1
The process for producing 600 MPa-grade TRIP steel by acid rolling is characterized in that a hot rolled coil is used as a raw material, and the hot rolled coil is subjected to uncoiling, welding, stretching and straightening, acid washing, rolling and heat treatment in sequence to obtain 600 MPa-grade TRIP steel;
in the acid washing, the acid washing temperature is 77 ℃, and the acid washing speed is 100 m/min;
in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 140 m/min.
According to weight percentage, the chemical elements of the hot-rolled coil are as follows: c: 0.18%, Si: 0.14%, Mn: 1.5%, P: 0.020%, S: 0.007%, Alt: 1.1 percent, and the balance of Fe and inevitable impurity elements.
The coiling temperature of the hot rolled coil is 630 ℃.
The hot rolled coil structure is pearlite and ferrite.
The welding adopts laser welding, the welding power is 11500w, the welding speed is 5m/min, and the wire feeding speed is 4 m/min.
In the welding, the welding seam annealing current is 165A, and the welding seam annealing temperature is 760 ℃.
In the above stretching straightening, the elongation was 0.6%, and in the bending element insertion amount, the 1# bending element insertion amount was 24mm, the 2# bending element insertion amount was 18mm, and the 3# straightening element insertion amount was 10 mm.
The five-rolling mill F1-F5 has the following rolling technological parameters:
the pressed distribution rate is as follows in sequence: 47%, 36%, 17-26%, 20%, 1%;
the unit tension between the rolling mills is as follows in sequence: 60N/mm2，160N/mm2，180N/mm2，200N/mm2，210N/mm2，75N/mm2；
The bending force of the working roll is as follows in sequence: 550KN, 500KN, 450KN, 450KN, 200 KN.
In the heat treatment, the annealing temperature was 770 ℃.
Example 2
The process for producing 600 MPa-grade TRIP steel by acid rolling is characterized in that a hot rolled coil is used as a raw material, and the hot rolled coil is subjected to uncoiling, welding, stretching and straightening, acid washing, rolling and heat treatment in sequence to obtain 600 MPa-grade TRIP steel;
in the acid washing, the acid washing temperature is 74 ℃, and the acid washing speed is 50 m/min;
in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 70 m/min.
According to weight percentage, the chemical elements of the hot-rolled coil are as follows: c: 0.17%, Si: 0.12%, Mn: 1.4%, P: 0.020%, S: 0.007%, Alt: 1.0 percent, and the balance of Fe and inevitable impurity elements.
The hot rolled coil curling temperature is 610 ℃.
The hot rolled coil structure is pearlite and ferrite.
The welding adopts laser welding, the welding power is 11000w, the welding speed is 4m/min, and the wire feeding speed is 3 m/min.
In the welding, the welding seam annealing current is 150A, and the welding seam annealing temperature is 740 ℃.
In the above stretching and straightening, the elongation was 0.5%, and in the amount of insertion of the bending element, the amount of insertion of the 1# bending element was 18mm, the amount of insertion of the 2# bending element was 12mm, and the amount of insertion of the 3# straightening element was 6 mm.
The five-rolling mill F1-F5 has the following rolling technological parameters:
the pressed distribution rate is as follows in sequence: 35%, 32%, 17-26%, 18%, 0.4%;
the unit tension between the rolling mills is as follows in sequence: 50N/mm2，140N/mm2，160N/mm2，160N/mm2，180N/mm2，60N/mm2；
The bending force of the working roll is as follows in sequence: 500KN, 480KN, 420KN, 430KN, 150 KN.
In the heat treatment, the annealing temperature was 720 ℃.
Example 3
The process for producing 600 MPa-grade TRIP steel by acid rolling is characterized in that a hot rolled coil is used as a raw material, and the hot rolled coil is subjected to uncoiling, welding, stretching and straightening, acid washing, rolling and heat treatment in sequence to obtain 600 MPa-grade TRIP steel;
in the acid washing, the acid washing temperature is 80 ℃, and the acid washing speed is 150 m/min;
in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 70-220 m/min.
According to weight percentage, the chemical elements of the hot-rolled coil are as follows: c: 0.20%, Si: 0.16%, Mn: 1.65%, P: 0.020%, S: 0.007%, Alt: 1.2 percent, and the balance of Fe and inevitable impurity elements.
The coiling temperature of the hot rolled coil is 650 ℃.
The hot rolled coil structure is pearlite and ferrite.
The welding adopts laser welding, the welding power is 12000w, the welding speed is 6m/min, and the wire feeding speed is 5 m/min.
In the welding process, the welding seam annealing current is 180A, and the welding seam annealing temperature is 780 ℃.
In the above stretching straightening, the elongation was 0.8%, and in the bending element insertion amount, the 1# bending element insertion amount was 30mm, the 2# bending element insertion amount was 24mm, and the 3# straightening element insertion amount was 15 mm.
The five-rolling mill F1-F5 has the following rolling technological parameters:
the pressed distribution rate is as follows in sequence: 60%, 40%, 26%, 22% and 2%;
the unit tension between the rolling mills is as follows in sequence: 70N/mm2，180N/mm2，200N/mm2，230N/mm2，250N/mm2，90N/mm2；
The bending force of the working roll is as follows in sequence: 600KN, 520KN, 480KN, 480KN, 260 KN.
In the heat treatment, the annealing temperature was 820 ℃.
The TRIP steels prepared by the prior art were compared, and the 600MPa class TRIP steels prepared in examples 1 to 3 and the prior TRIP steels were subjected to mechanical property tests, and the test results are shown in Table 1.
TABLE 1
Figure BDA0002156980190000061
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (4)

1. The process for producing the 600 MPa-grade TRIP steel by acid rolling is characterized in that a hot rolled coil is used as a raw material, and the hot rolled coil is subjected to uncoiling, welding, stretching and straightening, acid washing, rolling and heat treatment in sequence to obtain the 600 MPa-grade TRIP steel;
in the acid washing, the acid washing temperature is 74-80 ℃, and the acid washing speed is 50-150 m/min;
in the rolling process, a five-rolling mill F1-F5 is adopted for cold continuous rolling, and the inlet speed of the five-rolling mill F1-F5 is 70-220 m/min;
according to weight percentage, the chemical elements of the hot-rolled coil are as follows:
Figure DEST_PATH_IMAGE002
，
Figure DEST_PATH_IMAGE004
the balance of Fe and inevitable impurity elements, and the hot-rolled coil structure is pearlite and ferrite; the welding adopts laser welding, the welding power is 11000-12000W, the welding speed is 4-6m/min, and the wire feeding speed is 3-5 m/min;
in the stretching and straightening, the elongation is 0.5-0.8%, and the insertion amount of the bending unit is 6-30 mm;
the five-rolling mill F1-F5 has the following rolling technological parameters:
the pressed distribution rate is as follows in sequence: 35-60%, 32-40%, 17-26%, 18-22% and 0.4-2%;
the unit tension between the rolling mills is as follows in sequence:
Figure DEST_PATH_IMAGE006
，
Figure DEST_PATH_IMAGE008
；
the bending force of the working roll is as follows in sequence: 500, 480, 520, 420, 480, 430, 480, 150, 260 KN;
in the heat treatment, the annealing temperature is 720-820 ℃;
the 600 MPa-grade TRIP steel comprises granular bainite and residual austenite on a ferrite matrix besides massive martensite after annealing; the banded structure is obviously improved, the martensite islands do not generate obvious tempering decomposition, and the size of the martensite islands is 1-3
Figure DEST_PATH_IMAGE010
To (c) to (d); the TRIP steel containing Al and low Si adopts Al to partially replace Si and can obtain good mechanical property under the continuous annealing process.
2. The process for producing the TRIP steel with the grade of 600MPa by acid rolling as claimed in claim 1, wherein the curling temperature of the hot-rolled coil is 610-650 ℃.
3. The process for producing the 600MPa grade TRIP steel through acid rolling as claimed in claim 1, wherein in the welding, the welding seam annealing current is 150-180A, and the welding seam annealing temperature is 740-780 ℃.
4. Process for the sour rolling production of TRIP steel of grade 600MPa according to claim 1, characterized in that the bending elements are inserted in an amount of 1
Figure DEST_PATH_IMAGE012
The insertion amount of the bending unit is 18-30mm, 2
Figure 10662DEST_PATH_IMAGE012
The insertion amount of the bending unit is 12-24mm, 3
Figure 865486DEST_PATH_IMAGE012
The insertion amount of the straightening unit is 6-15 mm.
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