CN114558904B - 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 PDFInfo
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- CN114558904B CN114558904B CN202210280346.6A CN202210280346A CN114558904B CN 114558904 B CN114558904 B CN 114558904B CN 202210280346 A CN202210280346 A CN 202210280346A CN 114558904 B CN114558904 B CN 114558904B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000000137 annealing Methods 0.000 title claims abstract description 36
- 238000005097 cold rolling Methods 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 78
- 239000002253 acid Substances 0.000 claims abstract description 28
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000004886 process control Methods 0.000 claims abstract description 4
- 238000009628 steelmaking Methods 0.000 claims abstract description 4
- 239000000839 emulsion Substances 0.000 claims description 18
- 238000002310 reflectometry Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 241000565357 Fraxinus nigra Species 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 6
- 238000007127 saponification reaction Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000003449 preventive effect Effects 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 3
- 239000010936 titanium Substances 0.000 description 8
- 239000011572 manganese Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000010955 niobium Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000004164 analytical calibration Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000008237 rinsing water Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910020012 Nb—Ti Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
Landscapes
- 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-rolled automobile plates with the thickness of 0.7 to 1mm; 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 to 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 to 0.06%, the content of N is controlled to be less than 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
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 and N elements in the steel is low, and a certain amount of Ti and Nb is added to fix the C and 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 Sanka Steel and Steel research institute Limited company and Jiangsu Collection metallurgy technology research institute Limited company, the invention patent filed is as follows: CN113106353A provides a niobium-titanium microalloyed DC05 based on a refining duplex process and a preparation method thereof, belonging to the technical field of ferrous metallurgy and material forming. The preparation process flow of the DC05 comprises the following steps: 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 to 0.2 percent; [ 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 to 0.08 percent; [ Nb ]:0.005 to 0.02 percent; [ 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) CN106987777A (2017101616866), the invention discloses a titanium-containing micro-vanadium ultra-deep drawing IF steel and a production method thereof, and the weight percentage of the chemical components are as follows: c:0.0010 to 0.0040 percent of Si, less than or equal to 0.03 percent of Mn, 0.10 to 0.20 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.010 percent of S, 0.020 to 0.050 percent of Als, 0.055 to 0.070 percent of Ti, less than or equal to 0.0040 percent of N, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Ni, less than or equal to 0.020 percent of Mo, less than or equal to 0.005 percent of Nb, less than or equal to 0.015 percent of V, less than or equal to 0.0005 percent 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), CN103757535A (2013106955331), a cold-rolled deep-drawing steel with bake hardening properties, which comprises the following components in wt%: c:0.0015 to 0.0025 percent, mn:0.05 to 0.20%, als:0.02 to 0.06%, nb:0.006 to 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 an automobile external covering part 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=140 MPa-180 MPa, the tensile strength Rm =270 MPa-310 MPa, the elongation A80mm is more than or equal to 38%, 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 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 to 1mm; 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 to 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 to 0.06%, the content of N is controlled to be less than 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 convexity of the wedge shape of the hot rolled coil raw material, controlling the wedge shape within 40mm, wherein the wedge shape is not more 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 120us/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 0.2Mpa;
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 machine frame A system is 1-4: the concentration of the emulsion is 1.8-2.2%, the saponification value is 140-160 mg 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 of the emulsion is required to be as follows: 50 to 60 ℃, and the requirement of PH value: 6.0 to 6.5, and the conductivity is less than 400us/cm;
the thickness control requirement of the raw materials is as follows: when the thickness of the raw material is 4mm, the minimum rolling thickness is 0.691mm, the maximum rolling thickness is 0.799mm, the minimum deformation rate is 80%, and the maximum deformation rate is 83%; when the thickness of the raw material is 4.5mm, the minimum rolling thickness is 0.8mm, the maximum rolling thickness is 1mm, the minimum deformation rate is 77%, and the maximum deformation rate is 83%;
controlling the rolling thickness, namely at the position of 1/2 of the width of the steel plate:
when the target thickness of the order thickness is 0.7mm, the target thickness of the rolling mill is 0.694mm, the smooth target thickness is 0.69mm, the target thickness of the recoiling 1 is 0.685mm, and the product precision is +/-0.03 mm; when the target thickness of the order thickness is 0.8mm, the target thickness of the rolling mill is 0.796mm, the smooth target thickness is 0.79mm, the target thickness of the recoiling 1 is 0.785mm, and the product precision is +/-0.03 mm; when the target thickness of the order thickness is 0.9mm, the target thickness of the rolling mill is 0.895mm, the target thickness of the flat rolling mill is 0.89mm, the target thickness of the recoiling 1 is 0.885mm, and the product precision is +/-0.03 mm; when the target thickness of the order thickness is 1mm, the target thickness of the rolling mill is 0.992mm, the target thickness of the flattening mill is 0.985mm, the target thickness of the rewinding 1 is 0.98mm, and the product precision is +/-0.035 mm;
the requirements of rolling speed are as follows: the inlet loop amount is ensured to be more than 60%; 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 requirement: 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) controlling the total reduction rate of the IF steel to be less than 83%; (4) 5, controlling the frame pressing rate to be 2-5%; (5) Adjusting 5-frame emulsion to low concentration before the roller rolling, and controlling and purging plate types: oil leakage between the frames is not allowed, and the purging pressure at the outlet of the rolling mill is more than 0.5MPA; the nozzle is not allowed to lose blockage, the blowing angle of the plate surface ranges from 45 degrees to 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 requirements are 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 reflectivity 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 hood-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 of 730 ℃ and 13H is adopted; heating time, holding time and cooling time are respectively 9h,13h and 5h, tapping is carried out 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 to 5 hours;
4) Step four: the technical requirements of the leveling procedure 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%; 0.6-0.8% of the elongation of the leveler of 0.8-1mm, and is controlled according to 0.6% of the lower limit;
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 tension straightening of the recoiling unit is adjusted on line according to the actual situation, the head, the middle and the tail of the steel coil are sampled, the whole production process is tracked during the production period, the control points of the production process do not accord with the conditions, the steel coil is not produced, and the surface state is as follows: the roughness of the rough surface is 0.61-1.9, the surface precision is controlled according to the high requirement of FB, the rust preventive oil on the surface of the steel strip is clean, the condition of obvious black oil or black ash is forbidden after wiping, and in order to facilitate the detection of the black oil or the black ash, the reflectivity of the surface 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'. 1.2g/mm).
The invention has the following effects: compared with the performance of 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 greater than 0.22 and the R value is greater than 2.1. The surface reflectivity of the steel plate is more than 65 percent.
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 to 1mm; 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 to 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 to 0.06%, the content of N is controlled to be less than 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 convexity of the wedge shape of the hot rolled coil raw material, controlling the wedge shape within 40mm, wherein the wedge shape is not more 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 120us/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 0.2Mpa;
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 machine frame A system is 1-4: the concentration of the emulsion is 1.8-2.2%, the saponification value is 140-160 mg (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: 50 to 60 ℃, and the PH value is required to be: 6.0 to 6.5, and the conductivity is less than 400us/cm;
the thickness control requirement of the raw materials is as follows:
the requirements of rolling speed are as follows: the inlet loop amount is ensured to be more than 60%; 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 requirement: 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) controlling the total reduction rate of the IF steel to be less than 83%; (4) 5, controlling the frame pressing rate to be 2-5%; (5) Adjusting 5-frame emulsion to low concentration before the roller rolling, and controlling and purging plate types: oil leakage between the frames is not allowed, and the purging pressure at the outlet of the rolling mill is more than 0.5MPA; the nozzle is not allowed to lose blockage, the blowing angle of the plate surface ranges from 45 degrees to 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 requirements are 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 reflectivity 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 after rolling roll by roll;
3) Step three: the technical requirements of the hood-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, tapping is carried out 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 to 5 hours;
4) Step four: the technical requirements of the leveling procedure are as follows: controlling the concentration of the leveling liquid to be 3% -5%; blowing and air injection pressure is more than 0.5MPA, the angle is 45-65 degrees, and a roughening roller is used for leveling a working roller; surface inspection is carried out, and 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%; 0.6-0.8% of the elongation of the leveler of 0.8-1mm, and is controlled according to 0.6% of the lower limit;
5) Step five: the reflectivity standard of the surface of the band steel of the rewinding unit is more than or equal to 65 percent; the tension set value of the tension straightening of the recoiling unit is adjusted on line according to the actual situation, the head, the middle and the tail of the steel coil are sampled, the whole production process is tracked during the production period, the control points of the production process do not accord with the conditions, the steel coil is not produced, and the surface state is as follows: the roughness of the rough surface is 0.61-1.9, the surface precision is controlled according to the high requirement of FB, the rust preventive oil on the surface of the steel strip is clean, the condition of obvious black oil or black ash is forbidden after wiping, and in order to facilitate the detection of the black oil or the black ash, the reflectivity of the surface 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); an oil coating mode: medium oiled (1.0' -1.2g/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 in test. The plate shape is good; the reflectivity of the surface 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, wherein the rolling reduction rate is 77.95%, and the rolling is 0.992mm 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 0.6%; then, straightening, coil 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.
Claims (1)
1. A cold rolling and cover annealing process of deep drawing Ti-IF steel is suitable for cold rolling automobile plates with the thickness of 0.7 to 1mm; the method is characterized in that: A. 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 to 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 to 0.06%, the content of N is controlled to be less than 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 rinse water: the conductivity test value of the No. 4 rinsing tank is less than or equal to 120us/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 0.2Mpa;
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 machine frame A system is 1-4: the concentration of the emulsion is 1.8-2.2%, the saponification value is 140-160 mg (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: 50 to 60 ℃, and the PH value is required to be: 6.0 to 6.5, and the conductivity is less than 400us/cm;
the thickness control requirement of the raw materials is as follows: when the thickness of the raw material is 4mm, the minimum rolling thickness is 0.691mm, the maximum rolling thickness is 0.799mm, the minimum deformation rate is 80%, and the maximum deformation rate is 83%; when the thickness of the raw material is 4.5mm, the minimum rolling thickness is 0.8mm, the maximum rolling thickness is 1mm, the minimum deformation rate is 77%, and the maximum deformation rate is 83%;
controlling the rolling thickness, namely at the position of 1/2 of the width of the steel plate: when the target thickness of the order thickness is 0.7mm, the target thickness of the rolling mill is 0.694mm, the smooth target thickness is 0.69mm, the target thickness of the recoiling 1 is 0.685mm, and the product precision is +/-0.03 mm; when the target thickness of the order thickness is 0.8mm, the target thickness of the rolling mill is 0.796mm, the smooth target thickness is 0.79mm, the target thickness of the recoiling 1 is 0.785mm, and the product precision is +/-0.03 mm; when the target thickness of the order thickness is 0.9mm, the target thickness of the rolling mill is 0.895mm, the target thickness of the flat rolling mill is 0.89mm, the target thickness of the recoiling 1 is 0.885mm, and the product precision is +/-0.03 mm; when the target thickness of the order thickness is 1mm, the target thickness of the rolling mill is 0.992mm, the target thickness of the flattening mill is 0.985mm, the target thickness of the rewinding 1 is 0.98mm, and the product precision is +/-0.035 mm; the rolling speed requirement is as follows: the inlet loop amount is ensured to be more than 60%; 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 requirement: 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) controlling the total reduction rate of the IF steel to be less than 83%; (4) 5, controlling the frame pressing rate to be 2-5%; (5) The 5-frame emulsion is adjusted to low concentration before the roller mode rolling, and the plate type control and purging 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 0.5MPA; the nozzle is not allowed to lose blockage, the blowing angle of the plate surface ranges from 45 degrees to 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 reflectivity 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, tapping is carried out 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 to 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%; 0.6-0.8% of the elongation of the leveler of 0.8-1mm, and is controlled according to 0.6% of the lower limit;
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 roughness of the rough surface is 0.61-1.9, the surface precision is controlled according to the high requirement of FB, the rust preventive oil on the surface of the steel strip is clean, the condition of obvious black oil or black ash is forbidden after wiping, and in order to facilitate the detection of the black oil or the black ash, the reflectivity of the surface 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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