CN113414236B - Control method for improving mechanical stripping rate of scale of 80-grade cord steel - Google Patents

Control method for improving mechanical stripping rate of scale of 80-grade cord steel Download PDF

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CN113414236B
CN113414236B CN202110706898.4A CN202110706898A CN113414236B CN 113414236 B CN113414236 B CN 113414236B CN 202110706898 A CN202110706898 A CN 202110706898A CN 113414236 B CN113414236 B CN 113414236B
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CN113414236A (en
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王鲁义
刘荣
王淼
王薛鹏
纪文杰
马伟
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Jiangsu Yonggang Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • 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
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    • 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
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    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/42—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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
    • 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

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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a control method for improving mechanical stripping rate of 80-grade cord steel scale, which relates to the technical field of high-speed wire rod production and comprises the following steps: heating and descaling a steel billet: the temperature of the soaking section is 1140-1200 ℃, and the heating time is more than or equal to 2 h; descaling with high-pressure water, wherein the descaling pressure is more than or equal to 14 MPa; billet rolling and spinning: the initial rolling temperature is 1070-1120 ℃; the finish rolling comprises a first finish rolling and a second finish rolling, wherein the temperature of the first finish rolling is 890-930 ℃; the second finish rolling temperature is 900-950 ℃; the spinning temperature is 920-950 ℃; and (3) cooling: air cooling and air cooling. The primary scale is removed by high-temperature rolling and high-pressure water descaling, and the ideal thickness and structure of the wire rod scale are obtained by proper spinning temperature, roller speed, fan air quantity and opening of a heat-insulating cover, and the structure and performance of the wire rod scale are not influenced.

Description

Control method for improving mechanical stripping rate of scale of 80-grade cord steel
Technical Field
The invention relates to the technical field of high-speed wire production, in particular to a control method for improving the mechanical stripping rate of an oxide scale of 80-grade cord steel.
Background
The mechanical stripping performance of the scale of the 80-grade cord steel wire rod of the conventional control method is poor, the mechanical stripping removal rate of the scale is less than 85%, the scale is easy to remain on the surface of the steel wire, the uniformity of boron coating on the surface of the steel wire is influenced, the wire drawing performance is reduced, the steel wire is easy to shine, and the consumption of a wire drawing die is increased.
Disclosure of Invention
In order to improve the mechanical stripping rate of the scale, solve the problem of scale residue on the surface of a steel wire, improve the wire drawing performance and reduce the consumption of a wire drawing die, the invention provides a control method for improving the mechanical stripping rate of the scale of 80-grade cord steel, which removes the primary scale through high-temperature rolling and high-pressure water descaling, obtains the ideal thickness and structure of the scale of a wire rod through proper spinning temperature, roller speed, air quantity of a fan and opening of a heat-insulating cover, and does not influence the tissue and the performance of the wire rod.
The present invention achieves the above-described object by the following technical means.
A control method for improving mechanical stripping rate of an oxide scale of 80-grade cord steel comprises the following steps:
heating and descaling a steel billet: the temperature of the soaking section is 1140-1200 ℃, and the heating time is more than or equal to 2 h; descaling with high-pressure water, wherein the descaling pressure is more than or equal to 14 MPa;
billet rolling and spinning: the initial rolling temperature is 1070-1120 ℃; the finish rolling comprises a first finish rolling and a second finish rolling, wherein the temperature of the first finish rolling is 890-930 ℃; the second finish rolling temperature is 900-950 ℃; the spinning temperature is 920-950 ℃;
and (3) cooling: air cooling and air cooling.
Further, the steel billet comprises the following chemical components in percentage by weight: c: 0.80-0.85%, Mn: 0.40-0.60%, Si: 0.15-0.30%, Cr: less than or equal to 0.05 percent, less than or equal to 0.015 percent, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Mo, less than or equal to 0.0020 percent of Al, less than or equal to 0.0010 percent of Ti, less than or equal to 0.0020 percent of [ O ] and less than or equal to 0.0050 percent of [ N ].
Further, the finished product speed of the wire rod in the wire laying machine is 100-106 m/s.
Further, the wire rod obtained after the billet steel is processed by the wire laying machine is conveyed to an air cooling channel through a roller way for air cooling, and the speed of the roller way is 0.80-1.18 m/s in the air cooling process.
Further, the temperature of the wire rod obtained after the wire feeding machine is processed is reduced to 300-340 ℃ after air cooling.
Furthermore, intermediate rolling exists between the initial rolling and the finish rolling, and the intermediate rolling temperature is 1000-1050 ℃.
Further, the descaling time is 1-3 s.
Furthermore, the FeO content in the iron scale in the wire rod is more than 80 percent, and the outermost layer of the surface of the wire rod is free of Fe2O3。
Furthermore, the thickness of the iron scale of the wire rod is 14-16 mu m.
The invention has the following beneficial effects:
(1) the thickness of the iron scale of the wire rod is increased to 14-16 mu m from the original 8-10 mu m, the proportion of FeO in the iron scale is increased to more than 80% from the original 70%, and the outermost layer of the surface of the wire rod does not contain Fe2O3The steel wire rod is tested by torsion, the iron scale of the new control method has no residue, the mechanical property and the structure of the steel wire rod meet the standard requirements, abnormal structures such as network grain boundary cementite and the like are not found, and the mechanical property is also improved to a certain extent.
(2) When the surface of the wire rod is pretreated, the mechanical stripping rate of the iron scale is up to more than 95%, no residue exists on the surface after online acid washing, the surface of the steel wire is coated with boron to be covered completely, the wire drawing performance is greatly improved, the surface quality grade of the steel wire is improved, and the consumption of a die is obviously improved.
(3) The method of the invention obtains relatively ideal thickness and structure of the iron scale, the mechanical property and the structure of the wire rod meet the standard requirements, the mechanical stripping rate is up to more than 95 percent, the iron scale after on-line acid cleaning has no residue, the steel wire coating effect is greatly improved, and the wire drawing performance is improved.
Detailed Description
A control method for improving mechanical stripping rate of an oxide scale of 80-grade cord steel comprises the following steps:
1) firstly, selecting a steel billet: the 80-grade cord steel comprises the following chemical components in percentage by weight: 0.80-0.85%, Mn: 0.40-0.60%, Si: 0.15-0.30%, Cr: less than or equal to 0.05 percent, less than or equal to 0.015 percent, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Mo, less than or equal to 0.0020 percent of Al, less than or equal to 0.0010 percent of Ti, less than or equal to 0.0020 percent of [ O ] and less than or equal to 0.0050 percent of [ N ].
2) Heating and descaling a steel billet: because the 80-grade cord steel belongs to hypereutectoid steel and is easy to generate reticular grain boundary cementite, high-temperature heating is adopted, the temperature of a soaking section is 1140-1200 ℃, the time in the furnace is not less than 2 hours, segregation is further improved through high-temperature diffusion, and a guarantee is provided for avoiding abnormal coil rod organization caused by reduction of the air volume of a fan in the subsequent cooling control process; in addition, descaling is carried out by high-pressure water, the descaling pressure is more than or equal to 14MPa, and primary scale is thoroughly removed;
3) billet rolling and spinning: the initial rolling temperature is 1070-1120 ℃, the temperature of entering an NTM (finishing mill) is 890-930 ℃, the temperature of entering an RSM (reducing sizing mill) is 900-950 ℃, the spinning temperature is 920-950 ℃, the finished product speed is 100-106 m/s, and the spinning temperature is properly increased to thicken the iron scale of the wire rod through temperature-controlled rolling;
4) and (3) controlling cooling: the roller speed is 0.80-1.18 m/s, and air cooling is carried out.
In particular to a 1# to 16# fan and a protective cover, wherein,
the air volume (%) of the 1# -8# fan is 0/85/85/85/60/50/50, and the 9# -16# fans are turned off, wherein each timeThe air quantity of each fan is 200000m3Closing the first fan mainly aims to prolong the retention time of the wire rod in the high-temperature section, because the surface oxidation rate of the wire rod is increased sharply along with the increase of the temperature in the high-temperature section of 800-950 ℃, the thickness of the iron scale is increased remarkably, and the iron scale generated in the stage is mainly FeO; the 1# to 10# heat preservation cover is opened, and the 11# to 16# heat preservation cover is closed, so that the internal tissue stress is removed, the integrity of iron scales on the surface of the wire rod is kept, and the iron scales are prevented from being exploded and falling off.
The invention has the following beneficial effects:
(1) the thickness of the iron scale of the wire rod is increased to 14-16 mu m from the original 8-10 mu m, the proportion of FeO in the iron scale is increased to more than 80% from the original 70%, and the outermost layer of the surface of the wire rod does not contain Fe2O3After torsion test, the iron scale of the wire rod is free from residue, the mechanical property and the structure of the YLX80A wire rod meet the standard requirements, abnormal structures such as a net-shaped grain boundary cementite and the like are not found, and the mechanical property is improved to a certain extent.
(2) When the surface of the wire rod is pretreated, the mechanical stripping rate of the iron scale is up to more than 95%, no residue exists on the surface after online acid washing, the surface of the steel wire is coated with boron to be covered completely, the wire drawing performance is greatly improved, the surface quality grade of the steel wire is improved, and the consumption of a die is obviously improved.
Example 1
1) Firstly, selecting a steel billet: the 80-grade cord steel comprises the following chemical components in percentage by weight: 0.80%, Mn: 0.40%, Si: 0.30%, Cr: 0.05%, P: 0.010%, S: 0.010%, Ni: 0.05%, Cu: 0.05%, Mo: 0.03%, Al: 0.0010%, Ti: 0.0010%, [ O ]: 0.0020% and [ N ] 0.0010%.
2) Heating and descaling a steel billet: the temperature of the soaking section is 1140 ℃, the furnace time is 3 hours, the segregation is further improved through high-temperature diffusion, high-pressure water descaling is carried out, the descaling pressure is 15MPa, and primary scale is thoroughly removed;
3) billet rolling and spinning: the initial rolling temperature is 1070 ℃, the temperature of entering an NTM (finishing mill) is 930 ℃, the temperature of entering an RSM (reducing sizing mill) is 900 ℃, the spinning temperature is 920 ℃, the finished product speed is 100m/s, and the spinning temperature is properly increased to thicken the scale of the wire rod by temperature-controlled rolling;
4) and (3) controlling cooling: the roller speed is 0.800m/s, and air cooling is carried out.
The thickness of the iron scale of the wire rod obtained in the embodiment 1 is increased from 8-10 mu m to 16 mu m, the FeO content in the iron scale is increased from 70% to 82%, and the outermost layer of the surface of the wire rod is free of Fe2O3The steel wire rod is tested by torsion, the iron scale of the new control method has no residue, the mechanical property and the structure of the steel wire rod meet the standard requirements, abnormal structures such as network grain boundary cementite and the like are not found, and the mechanical property is also improved to a certain extent.
(2) When the surface of the wire rod is pretreated, the mechanical stripping rate of the iron scale is as high as 95%, no residue exists on the surface after on-line acid washing, the surface of the steel wire is completely covered by boron coating, the wire drawing performance is greatly improved, the surface quality grade of the steel wire is improved, and the consumption of a die is obviously improved.
Example 2
1) Firstly, selecting a steel billet: the 80-grade cord steel comprises the following chemical components in percentage by weight: 0.85%, Mn: 0.5%, Si: 0.15%, Cr: 0.01%, P: 0.015%, S: 0.005%, Ni: 0.01%, Cu: 0.04%, Mo: 0.02%, Al: 0.0020%, Ti: 0.0005%, [ O ]: 0.0010% and [ N ]: 0.0050%.
2) Heating and descaling a steel billet: because the 80-grade cord steel belongs to hypereutectoid steel and is easy to generate reticular grain boundary cementite, high-temperature heating is adopted, the temperature of a soaking section is set to be 1200 ℃, the furnace time is not less than 2 hours, the segregation is further improved through high-temperature diffusion, and the guarantee is provided for avoiding the abnormal structure of the wire rod caused by the reduction of the air volume of a fan in the subsequent cooling control process; in addition, descaling is carried out through high-pressure water, the descaling pressure is 14MPa, and primary oxide scales are thoroughly removed;
3) billet rolling and spinning: the initial rolling temperature is 1120 ℃, the temperature of entering an NTM (finishing mill) is 890 ℃, the temperature of entering an RSM (reducing sizing mill) is 920 ℃, the spinning temperature is 935 ℃, the finished product speed is 106m/s, and the spinning temperature is properly increased to thicken the iron scale of the wire rod by temperature-controlled rolling;
4) and (3) controlling cooling: the roller speed is 1.18m/s, and air cooling is carried out.
Examples2 the thickness of the scale of the wire rod is increased from 8-10 mu m to 14 mu m, the FeO content in the scale is increased from 70% to 83%, and the outermost layer of the surface of the wire rod is free of Fe2O3The steel wire rod is subjected to torsion test, the iron scale of the new control method has no residue, the mechanical property and the structure of the steel wire rod meet the standard requirements, abnormal structures such as a reticular grain boundary cementite and the like are not found, and the mechanical property is also improved to a certain extent; when the surface of the wire rod is pretreated, the mechanical stripping rate of the iron scale is up to 96%, no residue exists on the surface after on-line acid washing, the surface of the steel wire is coated with boron to be covered completely, the wire drawing performance is greatly improved, the surface quality grade of the steel wire is improved, and the consumption of a die is obviously improved.
Example 3
1) Firstly, selecting a steel billet: the weight percentage of chemical components of the 80-grade cord steel is C: 0.825%, Mn: 0.60%, Si: 0.25%, Cr: 0.005%, P: 0.005%, S: 0.002%, Ni: 0.008%, Cu: 0.01%, Mo: 0.001%, Al: 0.0005%, Ti: 0.0004%, [ O ]: 0.0008% and [ N ]: 0.0035%.
2) Heating and descaling a steel billet: because the 80-grade cord steel belongs to hypereutectoid steel and is easy to generate reticular grain boundary cementite, high-temperature heating is adopted, the temperature of a soaking section is 1170 ℃, the time in the furnace is 2.5 hours, segregation is further improved through high-temperature diffusion, and the wire rod abnormal structure is guaranteed to avoid the occurrence of the wire rod abnormal structure caused by the reduction of the air volume of a fan in the subsequent cooling control process; in addition, the primary scale is thoroughly removed by high-pressure water descaling with the descaling pressure of 16 MPa;
3) billet rolling and spinning: the initial rolling temperature is 1095 ℃, the temperature of entering an NTM (finishing mill) is 910 ℃, the temperature of entering an RSM (reducing sizing mill) is 950 ℃, the spinning temperature is 950 ℃, the finished product speed is 103m/s, and the spinning temperature is properly increased to thicken the scale of the wire rod by temperature-controlled rolling;
4) and (3) controlling cooling: the roller speed is 1m/s, and air cooling is performed.
The thickness of the scale of the wire rod obtained in the embodiment 3 is increased from 8-10 mu m to 15 mu m, the FeO content in the scale is increased from 70% to 80.5%, and the outermost layer of the surface of the wire rod is free of Fe2O3The wire rod is tested by torsion, and the iron scale of the new control method has no residueThe mechanical property and the structure of the wire rod meet the standard requirements, abnormal structures such as a net-shaped grain boundary cementite and the like are not found, and the mechanical property is also improved to a certain extent; when the surface of the wire rod is pretreated, the mechanical stripping rate of the iron scale is as high as 95.2%, no residue exists on the surface after online acid washing, the surface of the steel wire is coated with boron to be covered completely, the wire drawing performance is greatly improved, the surface quality grade of the steel wire is improved, and the consumption of a die is obviously improved.
It can be seen from examples 1-3 that the mechanical peeling rate of the iron scale is preferably 96% when the wire rod obtained by the scheme of example 2 is subjected to surface pretreatment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims (2)

1. A control method for improving mechanical stripping rate of an oxide scale of 80-grade cord steel is characterized by comprising the following steps:
(1) selecting a steel billet: the steel billet comprises the following chemical components in percentage by weight: 0.80-0.85%, Mn: 0.40-0.60%, Si: 0.15-0.30%, Cr: less than or equal to 0.05 percent, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Mo, less than or equal to 0.0020 percent of Al, less than or equal to 0.0010 percent of Ti, less than or equal to 0.0020 percent of [ O ] and less than or equal to 0.0050 percent of [ N ];
(2) heating and descaling a steel billet: the temperature of the soaking section is 1140-1200 ℃, and the time in the furnace is not less than 2 h; descaling by high-pressure water, wherein the descaling pressure is more than or equal to 14 MPa;
(3) billet rolling and spinning: the initial rolling temperature is 1070-1120 ℃; the finish rolling sequentially comprises finish rolling of a finish rolling mill and finish rolling of a reducing sizing mill, and the temperature of the finish rolling mill is 890-930 ℃; feeding the steel into a reducing sizing mill at 900-950 ℃; the spinning temperature is 920-950 ℃, and the finished product speed is 100-106 m/s;
(4) and (3) controlling cooling: air cooling, wherein in the air cooling process, the roller way speed is 0.80-1.18 m/s;
wherein, the FeO content in the cord steel scale is more than 80%, and the outermost layer of the cord steel surface has no Fe2O3。
2. The control method for improving the mechanical stripping rate of the scale of 80-grade cord steel according to claim 1, wherein the thickness of the scale of the cord steel is 14-16 μm.
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CN116984388B (en) * 2023-09-25 2023-12-01 江苏永钢集团有限公司 Novel cooling control process for reducing cord steel wire rod iron scale

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