CN114558904A - Cold rolling and cover annealing process of deep-drawing Ti-IF steel - Google Patents

Cold rolling and cover annealing process of deep-drawing Ti-IF steel Download PDF

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CN114558904A
CN114558904A CN202210280346.6A CN202210280346A CN114558904A CN 114558904 A CN114558904 A CN 114558904A CN 202210280346 A CN202210280346 A CN 202210280346A CN 114558904 A CN114558904 A CN 114558904A
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rolling
content
less
steel
equal
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CN114558904B (en
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向华
张永钢
于俊轩
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Xinjiang Bayi Iron and Steel Co Ltd
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Xinjiang Bayi Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/04—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • 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
    • 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
    • C21D8/0236—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
    • 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
    • C21D8/0242—Flattening; Dressing; Flexing
    • 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
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B2001/028—Slabs
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses a cold rolling and cover annealing process of deep drawing Ti-IF steel, wherein the content of C is controlled to be below 0.002 percent, and a design with lower content of C is adopted; the cover-type annealing process is adopted, which is different from the continuous annealing process, the temperature of the annealing process after rolling is stable, the annealing time is sufficient, and the annealing process is obviously different from the prior art, the temperature control in the annealing process is stable, and the obtained strip steel has uniform tissue and stable mechanical property. The process is suitable for cold rolling of automobile plates with the thickness of 0.7-1 mm; the chemical components of the original strip steel by mass percent: the content of C is less than 0.002%, the content of Si is less than 0.03%, the content of Mn is 0.1-0.2%, the content of P is less than 0.008%, the content of S is less than 0.008%, the content of Ti is 0.04-0.06%, the content of N is controlled below 30ppm, and the balance of Fe and residual elements; a process control path: 120 tons converter steelmaking plant-1750 mm hot rolling-acid cleaning-1420 mm cold rolling-cover annealing furnace-leveling machine set-recoiling machine set.

Description

Cold rolling and cover annealing process of deep drawing Ti-IF steel
Technical Field
The invention relates to a cold rolling and cover annealing process of deep drawing Ti-IF steel.
Background
The existing cold-rolled sheet is limited by chemical components and rolling and annealing processes, has poor stamping mechanical property and is difficult to meet the technical requirements of deep stamping quality. In order to improve the punching performance, interstitial free steel, namely IF steel is required, the content of C, N element in the steel is low, and a certain amount of Ti and Nb are added to fix C, N atoms in the steel into carbide and nitride, so that no interstitial atoms exist in the steel. The interstitial free steel has the deep drawing performances of low yield point and yield ratio, high elongation, high plastic strain ratio, high work hardening index and the like, and has no ageing.
And (3) searching documents: in the domestic prior art: 1) the invention patent 'niobium-titanium microalloying DC05 based on refining duplex process and preparation method thereof' published by Jiangsu province Sand Steel research institute Limited company and Jiangsu Collection metallurgy technology research institute Limited company: CN113106353A, which belongs to the technical field of ferrous metallurgy and material forming, in particular to niobium-titanium microalloyed DC05 based on a refining duplex process and a preparation method thereof. The preparation process flow of the DC05 is as follows: molten iron pretreatment → top and bottom combined blown converter → LF refining → RH refining → continuous casting → hot rolling → acid cleaning, cold continuous rolling → continuous annealing → product inspection. The finished product comprises the following components in percentage by mass: [C] less than or equal to 0.003 percent; [ Si ] is less than or equal to 0.01 percent; [ Mn ]: 0.1-0.2%; [ P ] is less than or equal to 0.012 percent; [ S ] is less than or equal to 0.01 percent; [ N ] is less than or equal to 0.003 percent; [ Als ]: 0.02-0.08%; [ Nb ]: 0.005-0.02%; [ Ti ]: 0.02-0.08%, and the balance of Fe and inevitable impurities. The Nb-Ti microalloyed DC05 is obtained through reasonable component design and process parameter setting, has better plane isotropy, and is more favorable for punch forming. 2) The invention discloses titanium-containing micro-vanadium ultra-deep drawing IF steel and a production method thereof, CN106987777A (2017101616866), and the invention discloses the titanium-containing micro-vanadium ultra-deep drawing IF steel and the production method thereof, wherein the titanium-containing micro-vanadium ultra-deep drawing IF steel comprises the following chemical components in percentage by weight: c: 0.0010-0.0040%, less than or equal to 0.03% of Si, 0.10-0.20% of Mn, less than or equal to 0.013% of P, less than or equal to 0.010% of S, 0.020-0.050% of Als, 0.055-0.070% of Ti, less than or equal to 0.0040% of N, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Cr, less than or equal to 0.05% of Ni, less than or equal to 0.020% of Mo, less than or equal to 0.005% of Nb, less than or equal to 0.015% of V, less than or equal to 0.0005% of B, and the balance of Fe and inevitable impurities; wherein Cu + Cr + Ni is less than or equal to 0.07 percent. The IF steel is reinforced by compounding Ti and V, and simultaneously, a small amount of vanadium is added to replace expensive niobium (or the contents of titanium and manganese are greatly reduced), so that the cost can be effectively reduced; has the characteristics of good performance and low cost. The method has the characteristics of low production cost, simple process, excellent product comprehensive performance and the like. 3) Wuhan iron and steel group, a cold-rolled deep-drawing steel with bake-hardening properties and a method for producing the same, CN103757535A (2013106955331), a cold-rolled deep-drawing steel with bake-hardening properties, the components and wt% of which are: c: 0.0015-0.0025%, Mn: 0.05-0.20%, Als: 0.02-0.06%, Nb: 0.006-0.012%, limit: si: less than or equal to 0.03%, S: less than or equal to 0.015 percent, P: less than or equal to 0.015 percent and less than or equal to 0.004 percent of N; the production steps are as follows: carrying out hot rolling; coiling; cold rolling; continuous annealing; rapidly cooling; performing overaging treatment; and (7) flattening. The invention has the performance of deep drawing IF steel, meets the requirement that high-strength bake-hardening steel cannot be used for stamping automobile external covering parts with complex deformation, and simultaneously has extremely low alloy content, thereby being beneficial to reducing the production cost; the product is as follows: the yield strength Rp0.2 is 140MPa to 180MPa, the tensile strength Rm is 270MPa to 310MPa, the elongation A80mm is more than or equal to 38 percent, the plastic strain ratio r90 is more than or equal to 1.8, the work hardening index n90 is more than or equal to 0.20, the BH value is more than 30MPa, and the natural aging does not occur for at least 3 months.
Disclosure of Invention
The invention aims to provide a cold rolling and cover annealing process of deep drawing Ti-IF steel, wherein the content of C is controlled to be below 0.002 percent, and the design of lower content of C is adopted; the cover-type annealing process is adopted, which is different from the continuous annealing process, the temperature of the annealing process after rolling is stable, the annealing time is sufficient, and the annealing process is obviously different from the prior art, the temperature control in the annealing process is stable, and the obtained strip steel has uniform tissue and stable mechanical property.
The invention relates to a cold rolling and cover annealing process of deep drawing Ti-IF steel, wherein A, the process is suitable for cold rolling automobile plates with the thickness of 0.7-1 mm; the chemical components of the original strip steel in percentage by mass: the content of C is less than 0.002%, the content of Si is less than 0.03%, the content of Mn is 0.1-0.2%, the content of P is less than 0.008%, the content of S is less than 0.008%, the content of Ti is 0.04-0.06%, the content of N is controlled below 30ppm, and the balance of Fe and residual elements; B. a process control path: 120 tons of converter steelmaking plants-1750 mm hot rolling-acid cleaning-1420 mm cold rolling-cover type annealing furnace-leveling machine set-recoiling machine set, and the specific implementation steps are as follows:
1) the method comprises the following steps: the hot rolled steel coil is subjected to an acid pickling process, and the acid pickling technical requirements are as follows: checking the wedge-shaped convexity of the hot rolled coil raw material, controlling the wedge shape within 40mm, and controlling the wedge shape not to be larger than the convexity; the carbon content C% is less than 0.002%; conductivity of rinsing water: the conductivity test value of the No. 4 rinsing tank is less than or equal to 120 us/cm; all the squeezing rollers must be in a complete state, and the acid solution concentration: the 1# acid tank acid solution HCl is more than or equal to 45 g/L, and the temperature of the acid tank is 65-80 ℃; the injection pressure is more than or equal to 0.2 Mpa;
2) step two: rolling the hot-rolled steel coil subjected to acid washing by a 5-tandem rolling mill, wherein the rolling and emulsion requirements are as follows: 5, a rack B system: the concentration of the emulsion is 0.8-1.5%, the saponification value is 140-160 mg KOH/g, the content of the miscellaneous oil is less than or equal to 20%, the content of the iron powder is less than or equal to 150ppm, and the weight ratio of the emulsion to the base oil is 1-4, namely a rack A system: the concentration of the emulsion is 1.8-2.2%, the saponification value is 140-160 mg of KOH/g, the content of the miscellaneous oil is less than or equal to 25%, the content of the iron powder is less than or equal to 200ppm, and the temperature requirement of the emulsion is as follows: the temperature is 50-60 ℃, and the PH value is required to be: 6.0-6.5, and the conductivity is less than 400 us/cm;
the thickness control requirement of the raw materials is as follows:
Figure 100002_DEST_PATH_IMAGE002
rolled thickness control, steel sheet width 1/2:
Figure 100002_DEST_PATH_IMAGE004
the rolling speed requirement is as follows: the inlet loop amount is ensured to be more than 60 percent; rolling at a constant rolling speed to ensure uniform rolling thickness; arranging SPCC steel as a transition material before rolling IF: (1) SPCC transition material requirements: arranging 200 tons of SPCC for rolling with the same specification and width; (2) controlling the roughness of the rough roller to be 3.5; (3) the total reduction rate of the IF steel is controlled to be less than 83 percent; (4) 5, controlling the reduction rate of the frame by 2-5%; (5) before the roller rolling, the quality and low concentration of 5-frame emulsion are adjusted, and the plate type is controlled and the blowing and sweeping requirements are as follows: oil leakage between the frames is not allowed, and the purging pressure at the outlet of the rolling mill is more than 0.5 MPA; the nozzle is not allowed to be blocked due to missing, the plate surface purging angle is 45-60 degrees, and the plate type control requirement is as follows: the target plate type is controlled according to micro double edge waves, the coiling tensile stress is less than or equal to 29.5Mpa, and the roller requirement is as follows: the working roll of the rolling mill uses a rough roll and a flat roll; more than 10 rolls of transition materials are required to pass through before rolling by a new roller, and degradation treatment is carried out when a steel coil has parking spots; measuring the surface emissivity of the outlet of the rolling mill by coils: the reflectivity is required to be more than 60 percent; checking the plate shape and the emulsion residue once per roll, and measuring and recording the surface roughness roll by roll after rolling;
3) step three: the technical requirements of the bell-type annealing furnace are as follows: the inner wall of the inner cover is not allowed to have dust, and before production, the black dust on the base of the furnace platform and the inner groove needs to be cleaned up so as to be loaded into the furnace; after rolling, the time interval between the rolling and the charging is not more than 24 hours, the materials are charged in a centralized manner, and an annealing process at 730 ℃ is adopted, and the temperature is 13H; heating time, holding time and cooling time are respectively 9h, 13h and 5h, discharging is carried out at the temperature of below 90 ℃, and in order to prevent bonding: the cover removing temperature is not higher than 600 ℃, and the cooling time with the cover is controlled within 3-5 hours;
4) step four: the technical requirements of the leveling process are as follows: controlling the concentration of the leveling liquid to be 3% -5%; the blowing and air-spraying pressure is more than 0.5MPA, the angle is 45-65 degrees, and a texturing roller is used for leveling the working roller; surface inspection shows that no leveling liquid spot and leveling flower defect exist; leveling the elongation rate mode; the elongation of the 0.7mm temper mill is 0.5-0.7%, and the elongation is controlled according to the lower limit of 0.5%; the elongation of the 0.8-1 mm temper mill is 0.6-0.8%, and the elongation is controlled according to the lower limit of 0.6%;
5) step five: the reflectivity standard of the surface of the band steel of the recoiling unit is more than or equal to 65 percent; the tension set value of the withdrawal and straightening of the recoiling unit is adjusted on line according to actual conditions, the head, the middle and the tail of the steel coil are sampled, the whole production process is tracked during production, the control point of the production process is not in line with the conditions, the steel coil is not produced, and the surface state is as follows: the rough surface roughness is 0.61-1.9, the surface precision is controlled according to the high requirement of FB, the surface of the steel strip is clean in antirust oil, the condition of obvious black oil or black ash is forbidden after wiping, and for facilitating the detection of the black oil or the black ash, the surface reflectivity of the finished product strip steel needs to be measured for judgment: the reflectivity of the surface of the strip steel is more than or equal to 65 percent, and the strip steel is detected once in each batch. (measuring instrument: NOVO = SHADE DVD specification model: 45/0 degree; instrument calibration standard: absolute value method using calibration standard plate matched with measuring instrument); and (3) oiling mode: medium oiled (1.0' 1.2 g/mm).
The invention has the following effects: compared with the common cold rolling, the IF plate has good performance, good deep drawing performance and high elongation. Mass production can be achieved under the requirements of the control points. The yield strength can be controlled below 170Mpa, and the elongation is more than 43 percent; the N value is more than 0.22, and the R value is more than 2.1. The surface reflectivity of the steel plate is more than 65 percent.
Figure DEST_PATH_IMAGE006
The invention has the advantages of good market promotion prospect, good comprehensive mechanical property of the strip steel and excellent stamping forming performance by combining the experiments and the comparison of the prior art, and is particularly suitable for domestic cold rolling production lines adopting the cover annealing process of the same type. The requirements of enterprises and purchasers on product quality are met, and the market application of the cold-rolled sheet is expanded.
Detailed Description
A cold rolling and cover annealing process of deep drawing Ti-IF steel is disclosed, wherein A, the process is suitable for cold rolling automobile plates with the thickness of 0.7-1 mm; the chemical components of the original strip steel by mass percent: the content of C is less than 0.002%, the content of Si is less than 0.03%, the content of Mn is 0.1-0.2%, the content of P is less than 0.008%, the content of S is less than 0.008%, the content of Ti is 0.04-0.06%, the content of N is controlled below 30ppm, and the balance of Fe and residual elements; B. a process control path: 120 tons of converter steelmaking plants-1750 mm hot rolling-acid cleaning-1420 mm cold rolling-cover type annealing furnace-leveling machine set-recoiling machine set, and the specific implementation steps are as follows:
1) the method comprises the following steps: the hot rolled steel coil is subjected to an acid pickling process, and the acid pickling technical requirements are as follows: checking the wedge-shaped convexity of the hot rolled coil raw material, controlling the wedge shape within 40mm, and controlling the wedge shape not to be larger than the convexity; the carbon content C% is less than 0.002%; conductivity of rinsing water: the conductivity test value of the No. 4 rinsing tank is less than or equal to 120 us/cm; all the squeezing rollers must be in a complete state, and the acid solution concentration: 1# acid tank acid solution HCl is more than or equal to 45 g/L, and the temperature of the acid tank is 65-80 ℃; the injection pressure is more than or equal to 0.2 Mpa;
2) step two: rolling the hot-rolled steel coil subjected to acid washing by a 5-tandem rolling mill, wherein the rolling and emulsion requirements are as follows: 5, rack B system: the concentration of the emulsion is 0.8-1.5%, the saponification value is 140-160 mg KOH/g, the content of the miscellaneous oil is less than or equal to 20%, the content of the iron powder is less than or equal to 150ppm, and the weight ratio of the emulsion to the base oil is 1-4, namely a rack A system: the concentration of the emulsion is 1.8-2.2%, the saponification value is 140-160 mg of KOH/g, the content of the miscellaneous oil is less than or equal to 25%, the content of the iron powder is less than or equal to 200ppm, and the temperature requirement of the emulsion is as follows: the temperature is 50-60 ℃, and the PH value is required to be: 6.0-6.5, and the conductivity is less than 400 us/cm;
the thickness control requirement of the raw materials is as follows:
Figure DEST_PATH_IMAGE008
Figure DEST_PATH_IMAGE010
the rolling speed requirement is as follows: the inlet loop amount is ensured to be more than 60 percent; the rolling speed is uniform, so that the uniform rolling thickness is ensured; arranging SPCC steel as a transition material before rolling IF: (1) SPCC transition material requirements: arranging 200 tons of SPCC for rolling with the same specification and width; (2) controlling the roughness of the rough roller to be 3.5; (3) the total reduction rate of the IF steel is controlled to be less than 83 percent; (4) 5, controlling the reduction rate of the frame by 2-5%; (5) before the roller rolling, the quality and low concentration of 5-frame emulsion are adjusted, and the plate type is controlled and the blowing and sweeping requirements are as follows: oil leakage between the frames is not allowed, and the purging pressure at the outlet of the rolling mill is more than 0.5 MPA; the nozzle is not allowed to be blocked due to missing, the plate surface purging angle is 45-60 degrees, and the plate shape control requirement is as follows: the target plate type is controlled according to micro double edge waves, the coiling tensile stress is less than or equal to 29.5Mpa, and the roller requirement is as follows: the working roll of the rolling mill uses a rough roll and a flat roll; more than 10 rolls of transition materials are required to pass through before rolling by a new roller, and degradation treatment is carried out when a steel coil has parking spots; measuring the surface emissivity of the outlet of the rolling mill by coils: the reflectivity is required to be more than 60 percent; checking the plate shape and the emulsion residue once per roll, and measuring and recording the surface roughness roll by roll after rolling;
3) step three: the technical requirements of the bell-type annealing furnace are as follows: the inner wall of the inner cover is not allowed to have dust, and before production, the black dust on the base of the furnace platform and the inner groove needs to be cleaned up so as to be loaded into the furnace; after rolling, the time interval between the rolling and the charging is not more than 24 hours, the materials are charged in a centralized manner, and an annealing process at 730 ℃ is adopted, and the temperature is 13H; heating time, holding time and cooling time are respectively 9h, 13h and 5h, discharging at the temperature of below 90 ℃, and in order to prevent bonding: the cover removing temperature is not more than 600 ℃, and the cooling time with the cover is controlled within 3-5 hours;
4) step four: the technical requirements of the leveling process are as follows: controlling the concentration of the leveling liquid to be 3% -5%; the blowing and air-spraying pressure is more than 0.5MPA, the angle is 45-65 degrees, and a texturing roller is used for leveling the working roller; surface inspection shows that no leveling liquid spot and leveling flower defect exist; leveling the elongation rate mode; the elongation of the 0.7mm temper mill is 0.5-0.7%, and the elongation is controlled according to the lower limit of 0.5%; the elongation of the 0.8-1 mm temper mill is 0.6-0.8%, and the elongation is controlled according to the lower limit of 0.6%;
5) step five: the reflectivity standard of the surface of the band steel of the recoiling unit is more than or equal to 65 percent; the tension set value of the withdrawal and straightening of the recoiling unit is adjusted on line according to actual conditions, the head, the middle and the tail of the steel coil are sampled, the whole production process is tracked during production, the control point of the production process is not in line with the conditions, the steel coil is not produced, and the surface state is as follows: the rough surface roughness is 0.61-1.9, the surface precision is controlled according to the high requirement of FB, the surface of the steel strip is clean in antirust oil, the condition of obvious black oil or black ash is forbidden after wiping, and for facilitating the detection of the black oil or the black ash, the surface reflectivity of the finished product strip steel needs to be measured for judgment: the reflectivity of the surface of the strip steel is more than or equal to 65 percent, and the strip steel is detected once in each batch. (measuring instrument: NOVO = SHADE DVD specification model: 45/0 degree; instrument calibration standard: absolute value method using calibration standard plate matched with measuring instrument); and (3) oiling mode: medium oiled (1.0' 1.2 g/mm).
Example 1:
after acid washing, 4.0mm hot rolled coil raw materials are subjected to 5-frame continuous rolling, the rolling reduction rate is 82.65%, and the rolling is 0.694mm thick cold rolled sheet; the temperature is kept for 13 hours at 730 ℃ in the covering and withdrawing process; after annealing and discharging, carrying out leveling cleaning according to the elongation of 0.5%; then, straightening, splitting and oiling treatment are carried out through a rewinding process; the head, the middle and the tail of the steel coil are sampled, and the mechanical property is good. The plate shape is good; the surface reflectivity of the steel plate is more than 65 percent.
Example 2:
after acid washing, 4.5mm hot rolled coil raw materials are subjected to 5-frame continuous rolling, the rolling reduction rate is 77.95%, and the rolling is 0.992mm thick cold-rolled sheet; entering a cover annealing process and keeping the temperature at 730 ℃ for 13 hours; after annealing and discharging, carrying out leveling cleaning according to the elongation of 0.6%; then, straightening, splitting and oiling treatment are carried out through a rewinding process; the head, the middle and the tail of the steel coil are sampled, and the mechanical property is good in test. The plate shape is good; the surface reflectivity of the steel plate is more than 65 percent.

Claims (1)

1. A cold rolling and cover annealing process of deep-drawing Ti-IF steel is suitable for cold-rolled automobile plates with the thickness of 0.7-1 mm; the method is characterized in that: A. the chemical components of the original strip steel by mass percent: the content of C is less than 0.002%, the content of Si is less than 0.03%, the content of Mn is 0.1-0.2%, the content of P is less than 0.008%, the content of S is less than 0.008%, the content of Ti is 0.04-0.06%, the content of N is controlled below 30ppm, and the balance of Fe and residual elements; B. a process control path: 120 tons of converter steelmaking plants-1750 mm hot rolling-acid cleaning-1420 mm cold rolling-cover type annealing furnace-leveling machine set-recoiling machine set, and the specific implementation steps are as follows:
1) the method comprises the following steps: the hot rolled steel coil is subjected to an acid pickling process, and the acid pickling technical requirements are as follows: checking the wedge-shaped convexity of the hot rolled coil raw material, controlling the wedge shape within 40mm, and controlling the wedge shape not to be larger than the convexity; the carbon content C% is less than 0.002%; conductivity of rinsing water: the conductivity test value of the No. 4 rinsing tank is less than or equal to 120 us/cm; all the squeezing rollers must be in a complete state, and the acid solution concentration: 1# acid tank acid solution HCl is more than or equal to 45 g/L, and the temperature of the acid tank is 65-80 ℃; the injection pressure is more than or equal to 0.2 Mpa;
2) step two: rolling the hot-rolled steel coil subjected to acid washing by a 5-tandem rolling mill, wherein the rolling and emulsion requirements are as follows: 5, a rack B system: the concentration of the emulsion is 0.8-1.5%, the saponification value is 140-160 mg KOH/g, the content of the miscellaneous oil is less than or equal to 20%, the content of the iron powder is less than or equal to 150ppm, and the weight ratio of the emulsion to the base oil is 1-4, namely a rack A system: the concentration of the emulsion is 1.8-2.2%, the saponification value is 140-160 mg of KOH/g, the content of the miscellaneous oil is less than or equal to 25%, the content of the iron powder is less than or equal to 200ppm, and the temperature requirement of the emulsion is as follows: the temperature is 50-60 ℃, and the PH value is required to be: 6.0-6.5, and the conductivity is less than 400 us/cm;
the thickness control requirement of the raw materials is as follows:
Figure DEST_PATH_IMAGE002
rolled thickness control, steel sheet width 1/2:
Figure DEST_PATH_IMAGE004
the rolling speed requirement is as follows: the inlet loop amount is ensured to be more than 60 percent; rolling at a constant rolling speed to ensure uniform rolling thickness; arranging SPCC steel as a transition material before rolling IF: (1) SPCC transition material requirements: arranging 200 tons of SPCC for rolling with the same specification and width; (2) controlling the roughness of the rough roller to be 3.5; (3) the total reduction rate of IF steel is controlled below 83%; (4) 5, controlling the reduction rate of the frame by 2-5%; (5) before the roller rolling, the quality and low concentration of 5-frame emulsion are adjusted, and the plate type is controlled and the blowing and sweeping requirements are as follows: oil leakage between the frames is not allowed, and the purging pressure at the outlet of the rolling mill is more than 0.5 MPA; the nozzle is not allowed to be blocked due to missing, the plate surface purging angle is 45-60 degrees, and the plate shape control requirement is as follows: the target plate type is controlled according to micro double edge waves, the coiling tensile stress is less than or equal to 29.5Mpa, and the roller requirement is as follows: the working roll of the rolling mill uses a rough roll and a flat roll; more than 10 rolls of transition materials are required to pass before rolling by a new roller, and degradation treatment is carried out when a steel coil has parking spots; measuring the surface emissivity of the outlet of the rolling mill by coils: the reflectivity is required to be more than 60 percent; checking the plate shape and the emulsion residue once per roll, and measuring and recording the surface roughness roll by roll after rolling;
3) step three: the technical requirements of the bell-type annealing furnace are as follows: the inner wall of the inner cover is not allowed to have dust, the time interval between the rolling and the charging is not more than 24 hours, the furnace is charged in a centralized manner, and an annealing process of 730 ℃ and 13H is adopted; heating time, holding time and cooling time are respectively 9h, 13h and 5h, discharging is carried out at the temperature of below 90 ℃, and in order to prevent bonding: the cover removing temperature is not higher than 600 ℃, and the cooling time with the cover is controlled within 3-5 hours;
4) step four: the technical requirements of the leveling process are as follows: controlling the concentration of the leveling liquid to be 3% -5%; the blowing and air-spraying pressure is more than 0.5MPA, the angle is 45-65 degrees, and a texturing roller is used for leveling the working roller; surface inspection shows that no leveling liquid spot and leveling flower defect exist; leveling elongation rate mode; the elongation of the 0.7mm temper mill is 0.5-0.7%, and the elongation is controlled according to the lower limit of 0.5%; the elongation of the 0.8-1 mm temper mill is 0.6-0.8%, and the elongation is controlled according to the lower limit of 0.6%;
5) step five: the reflectivity standard of the surface of the band steel of the recoiling unit is more than or equal to 65 percent; the tension set value of the withdrawal and straightening of the recoiling unit is adjusted on line according to actual conditions, the head, the middle and the tail of the steel coil are sampled, the whole production process is tracked during production, the control point of the production process is not in line with the conditions, the steel coil is not produced, and the surface state is as follows: the rough surface roughness is 0.61-1.9, the surface precision is controlled according to the high requirement of FB, the surface of the steel strip is clean in antirust oil, the condition of obvious black oil or black ash is forbidden after wiping, and for facilitating the detection of the black oil or the black ash, the surface reflectivity of the finished product strip steel needs to be measured for judgment: the reflectivity of the surface of the strip steel is more than or equal to 65 percent, and the strip steel is detected once in each batch.
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