CN108165709B - Strip steel processing technology for spring piece - Google Patents

Strip steel processing technology for spring piece Download PDF

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Publication number
CN108165709B
CN108165709B CN201810020574.3A CN201810020574A CN108165709B CN 108165709 B CN108165709 B CN 108165709B CN 201810020574 A CN201810020574 A CN 201810020574A CN 108165709 B CN108165709 B CN 108165709B
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temperature
annealing furnace
heating
annealing
furnace
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CN108165709A (en
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不公告发明人
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Ningbo Qiyi Metal Co., Ltd.
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NINGBO QIYI METAL CO Ltd
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    • 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
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D8/0273—Final recrystallisation annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • 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
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D8/0247—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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0021—Cutting or shearing the product in the rolling direction

Abstract

The invention relates to a strip steel processing technology for a spring piece, which comprises the following steps: selecting a hot-rolled coil with the mark of SCM 435; longitudinally cutting and splitting for the first time; softening and annealing the hot-rolled coil subjected to primary longitudinal shearing slitting through an annealing furnace/ammonia decomposition furnace to obtain a softened and annealed coil; pickling the softened and annealed coil plate to obtain a pickled coil plate; rolling the acid-washed coil plate to obtain a rolled coil plate; spheroidizing annealing is carried out on the rolled coil through an annealing furnace/an ammonia decomposing furnace to prepare a spheroidizing annealed coil; carrying out finish rolling on the spheroidizing annealing coiled plate, and preparing a finish rolling coiled plate; the finish-rolled coil is subjected to secondary longitudinal shearing and splitting through a small splitting machine, and a split coil is prepared; and packaging and warehousing, and packaging the split rolled plates by using a packaging machine. The invention has the beneficial effects that: can stabilize the product quality and improve the labor productivity.

Description

Strip steel processing technology for spring piece
Technical Field
The invention relates to the technical field of strip steel production and processing, in particular to a strip steel processing technology for spring pieces.
Background
It is known that strip steel is a narrow and long steel sheet produced to suit the needs of different industrial sectors. The width of the glass is generally within 300mm, but with economic development, the width is not limited. The steel strip is supplied in a roll, has the advantages of high dimensional precision, good surface quality, convenient processing, material saving and the like, and is widely used for producing welded steel pipes, blanks of cold-formed steel, bicycle frames, rims, hoops, gaskets, spring pieces, saw blades and blades, soles of labor protection shoes, steel ladle heads and the like.
Under the influence of the current processing technology of the strip steel, the quality of the produced strip steel is not stable enough, unqualified products are easy to appear in the production process, and the whole production efficiency is lower.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a band steel processing technology which can stabilize the product quality and improve the labor productivity.
The technical scheme for solving the technical problems is as follows: a strip steel processing technology for a spring piece comprises the following steps:
preparing raw materials, and selecting a hot-rolled coil with the brand number of SCM 435;
step two, carrying out primary longitudinal shearing and splitting, namely transferring the hot-rolled coil prepared in the step one to a first large longitudinal shearing production line through a hoisting device to carry out primary longitudinal shearing and splitting;
step three, softening and annealing, transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1h to 5h after heating to 400 ℃, secondly, preserving heat for 1h to 5h at the temperature of 400 ℃, heating the annealing furnace to 600 ℃ within 1h to 6h, preserving heat for 0.5h to 4h after heating to 600 ℃, then, preserving heat for 0.5h to 4h at the temperature of 600 ℃, heating the annealing furnace to 690 ℃ within 1h to 5h, preserving heat for 0.5h to 4h after heating to 690 ℃, fourthly, preserving heat for 0.5h to 4h at the temperature of 690 ℃, heating the annealing furnace to 710 ℃ to 5h to 730 ℃, preserving heat for 10h to 18h after heating to 710 ℃ to 730 ℃, and preserving heat for 10h to 18h at the temperature of 710 ℃ to 730 ℃, cooling the annealing furnace for 4 to 8 hours in a furnace cooling mode, sixthly, cooling the annealing furnace for 4 to 8 hours in a furnace cooling mode, then carrying out cover replacement air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and reducing the temperature of the annealing furnace to 80 ℃ in a seventh mode, and finally discharging the annealing furnace to obtain a softened annealed coil plate in a water cooling mode after the temperature of the annealing furnace is reduced to 280 ℃;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
step five, rolling, namely transferring the acid-washed coil obtained after acid washing to a rolling mill production line through a hoisting device for rolling to obtain a rolled coil;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1h to 5h after heating to 400 ℃, then preserving heat for 1h to 5h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 1h to 6h, preserving heat for 0.5h to 4h after heating to 640 ℃, then preserving heat for 0.5h to 4h at the temperature of 640 ℃, heating the annealing furnace to 730 ℃ within 1h to 5h, preserving heat for 0.5h to 4h after heating to 730 ℃, fourthly, preserving heat for 0.5h to 4h at the temperature of 730 ℃, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.5h to 2h, preserving heat for 10h to 16h after heating to 740 ℃ to 760 ℃, and preserving heat for 10h to 16h at the temperature of 740 ℃ to 760 ℃ and preserving heat for 10h to 16h, reducing the temperature of the annealing furnace to 550-600 ℃ by a furnace cooling mode, sixth, after reducing the temperature of the annealing furnace to 550-600 ℃ by the furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ by a water cooling mode, and finally discharging to obtain a spheroidizing annealing coiled plate;
step seven, finish rolling, namely transferring the spheroidizing annealed coil obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling to obtain a finish rolled coil;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
The invention has the beneficial effects that: when the hot-rolled coil is subjected to softening annealing, the whole softening annealing process is divided into a plurality of stages, the temperature rise time, the heat preservation time and the temperature of each stage are effectively controlled, and when the rolled coil is subjected to spheroidizing annealing, the whole spheroidizing annealing process is divided into a plurality of stages, the temperature rise time, the heat preservation time and the temperature of each stage are effectively controlled, so that the quality of the produced product is stable, the product qualification rate is improved, and the labor productivity is further improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in the third step, during the softening annealing, the annealing furnace is heated to 400 ℃ at full speed, and the temperature is kept for 1.5 to 3 hours after the temperature is raised to 400 ℃; keeping the temperature of the annealing furnace at 400 ℃ for 1.5 to 3 hours, heating the annealing furnace to 600 ℃ within 2 to 4 hours, and keeping the temperature for 0.6 to 2 hours after heating to 600 ℃; keeping the temperature of the annealing furnace at 600 ℃ for 0.6 to 2 hours, heating the annealing furnace to 690 ℃ within 1.5 to 3 hours, and keeping the temperature for 0.6 to 2 hours after the temperature is raised to 690 ℃; keeping the temperature of the annealing furnace at 690 ℃ for 0.6h to 2h, heating the annealing furnace to 710 ℃ to 730 ℃ within 1.5h to 3h, and keeping the temperature for 11h to 16h after heating to 710 ℃ to 730 ℃; and (3) keeping the temperature of the annealing furnace at 710-730 ℃ for 11-16 h, and cooling the annealing furnace by adopting a furnace cooling mode for 4.5-7.2 h.
Further, heating the annealing furnace to 400 ℃ at full speed during softening annealing, and preserving heat for 1.8 to 2.4 hours after heating to 400 ℃; keeping the temperature of the annealing furnace at 400 ℃ for 1.8 to 2.4 hours, heating the annealing furnace to 600 ℃ within 2.8 to 3.4 hours, and keeping the temperature for 0.8 to 1.2 hours after heating to 600 ℃; keeping the temperature of the annealing furnace at 600 ℃ for 0.8 to 1.2 hours, heating the annealing furnace to 690 ℃ within 1.8 to 2.4 hours, and keeping the temperature for 0.8 to 1.2 hours after the temperature is raised to 690 ℃; keeping the temperature of the annealing furnace at 690 ℃ for 0.8h to 1.2h, heating the annealing furnace to 710 ℃ to 730 ℃ within 1.8h to 2.4h, and keeping the temperature for 11.2h to 15.6h after heating to 710 ℃ to 730 ℃; and (3) keeping the temperature of the annealing furnace at 710-730 ℃ for 11.2-15.6 h, and cooling the annealing furnace in a furnace cooling mode for 5.2-6.4 h.
Furthermore, in the softening annealing, a detonation test is required before the temperature is raised, so that the purity of the hydrogen in the ammonia decomposition furnace is ensured; in the whole temperature rising and preserving process, the difference value of the actual temperature value and the process temperature value is less than 15 ℃.
The adoption of the further beneficial effects is as follows: the quality stability of the softening annealing coiled plate can be effectively ensured.
Further, in the fourth step, before pickling, a metallographic microscope is used for detecting the spheroidization rate of the softened and annealed coil, and the softened and annealed coil qualified in detection is put on a pickling production line.
The adoption of the further beneficial effects is as follows: the parameter values in the production process can be adjusted in time according to the detection data, and the production quality is ensured.
Further, when pickling is carried out in the sixth step, the negative difference of the thicknesses of the softening annealing coil before and after pickling is less than 0.15mm, the number of the pickling tanks is two, the number of the passivating tanks is one, the number of the neutralizing tanks is one, the pickling concentrations of the two pickling tanks are respectively 18% -22% and 15% -18%, the acid positions in the two pickling tanks are 380 mm-420 mm, the temperature of the acid solution is 53 ℃ to 72 ℃, the pH value of the neutralizing tank is 11-13, the pH value of the passivating tank is 7-8, the temperature value of the passivating tank is 38 ℃ to 51 ℃, and the cleaning speed of the pickling production line is 5 m/min-15 m/min.
The adoption of the further beneficial effects is as follows: the oxide skin produced in the softening and annealing process of the rolled plate can be effectively removed, and the subsequent processing is prevented from being influenced.
Further, in the third step, during spheroidizing annealing, the annealing furnace is heated to 400 ℃ at full speed, and heat is preserved for 1.5 to 3 hours after the temperature is raised to 400 ℃; keeping the temperature of the annealing furnace at 400 ℃ for 1.5 to 3 hours, heating the annealing furnace to 640 ℃ within 2 to 4 hours, and keeping the temperature for 0.6 to 2 hours after the temperature is raised to 640 ℃; after the annealing furnace is subjected to heat preservation for 0.6h to 2h at the temperature of 640 ℃, heating the annealing furnace to 730 ℃ within 1.5h to 3h, and preserving the heat for 0.6h to 2h after the temperature is raised to 730 ℃; keeping the temperature of the annealing furnace at 730 ℃ for 0.6h to 2h, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.5h to 1.8h, and keeping the temperature for 11h to 14h after heating to 740 ℃ to 760 ℃.
Further, during spheroidizing annealing, heating the annealing furnace to 400 ℃ at full speed, and preserving heat for 1.8 to 2.4 hours after heating to 400 ℃; keeping the temperature of the annealing furnace at 400 ℃ for 1.8 to 2.4 hours, heating the annealing furnace to 640 ℃ within 2.5 to 3.2 hours, and keeping the temperature for 0.6 to 1.2 hours after the temperature is raised to 640 ℃; keeping the temperature of the annealing furnace at 640 ℃ for 0.6 to 1.2 hours, heating the annealing furnace to 730 ℃ within 1.8 to 2.4 hours, and keeping the temperature for 0.6 to 1.2 hours after the temperature is raised to 730 ℃; keeping the temperature of the annealing furnace at 730 ℃ for 0.6h to 1.2h, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.6h to 1.2h, and keeping the temperature for 12h to 13.5h after heating to 740 ℃ to 760 ℃.
Furthermore, in spheroidizing annealing, a detonation test is required before temperature rise is carried out, so that the purity of hydrogen in the ammonia decomposition furnace is ensured; in the whole temperature rising and preserving process, the difference value of the actual temperature value and the process temperature value is less than 15 ℃.
The adoption of the further beneficial effects is as follows: the quality stability of the spheroidizing annealed coil plate can be effectively ensured.
Further, in the eighth step, before the second longitudinal shearing and splitting, the hardness of the finish-rolled coiled plate is detected by using a universal testing machine and a hardness tester, and the qualified range of the hardness value of the finish-rolled coiled plate is 75HRB to 85 HRB; and performing metallographic detection on the finish-rolled coiled plate with qualified hardness value, and putting the finish-rolled coiled plate with qualified metallographic detection on a small slitting machine.
The adoption of the further beneficial effects is as follows: the parameter values in the production process can be adjusted in time according to the detection data, and the production quality is ensured.
Drawings
FIG. 1 is a graph illustrating the softening and annealing of a strip steel in accordance with the present invention;
FIG. 2 is a graph of spheroidizing annealing in the process of processing the strip steel according to the present invention;
FIG. 3 is a metallographic reference diagram of metallographic phase detection in the processing technique of the strip steel of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The first embodiment is as follows: as shown in fig. 1 and 2, a strip steel processing technology for a spring plate comprises the following steps:
step one, preparing raw materials, and selecting a hot rolled coil with the brand of SCM435, wherein the requirements of chemical components of the SCM435 hot rolled coil are as follows: 0.33 to 0.38 of C, 0.15 to 0.35 of Si, 0.60 to 0.90 of Mn, P: 0.030,. S: ≦ 0.030, Cr: 0.90 to 1.20, Ni: 0.25 ≦ Mo: 0.15 to 0.30; the mechanical property requirements of the hot-rolled coil of the SCM435 are as follows: the tensile strength is ≦ 1000 MPa; the requirements of the metallographic phase of the hot-rolled coil of the SCM435 are as follows: ferrite + pearlite structure and decarburized layer, when the thickness is larger than 5mm, the allowed decarburization is less than or equal to 1% t, wherein t is the thickness of a hot rolled steel plate, when the thickness is less than or equal to 5mm, the allowed decarburization is less than 50 μm, the banded structure is less than 2 grade, the fine system of inclusions is less than 2 grade, in the embodiment, the thickness of a hot rolled plate with the trade mark of SCM435 is 3mm to 8.0mm, preferably 5mm to 6 mm;
step two, slitting and splitting for the first time, and transferring the hot-rolled coiled plate prepared in the step one to a first large slitting production line through a hoisting device to perform slitting and splitting for the first time, wherein in order to facilitate subsequent process processing, the width direction of the hot-rolled coiled plate is reserved with a margin of about 0.5mm during slitting, and the thickness allowable deviation of the hot-rolled coiled plate meets the specification of GB/T709 and the convexity requirement: the thickness is less than or equal to 3.0mm, and the convexity is less than or equal to 40 μm; the thickness is 3mm to 8.0mm, the convexity is less than or equal to 60 micrometers, the thickness is more than 8.0mm, the convexity is less than or equal to 100 micrometers, bubbles, cracks, scabs, warping, pulling cracks and inclusions cannot be formed on the surface of the hot-rolled coil, the hot-rolled coil cannot be layered, and slight pockmarks, local deep pockmarks, small bubbles, slight scratches and roller indentations within a half of the thickness tolerance range are allowed on the surface; the edge of the hot-rolled coil is neat and has no saw-tooth shape, and the jumping of the reference end face of the blade is less than or equal to 0.06mm during longitudinal shearing;
step three, softening and annealing, namely transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1h after heating to 400 ℃, secondly, preserving heat for 1h at the temperature of 400 ℃, heating the annealing furnace to 600 ℃ within 1h, preserving heat for 0.5h after heating to 600 ℃, then, preserving heat for 0.5h at the temperature of 600 ℃, heating the annealing furnace to 690 ℃ within 1h, preserving heat for 0.5h after heating to 690 ℃, fourthly, preserving heat for 0.5h at the temperature of 690 ℃, heating the annealing furnace to 710 ℃ to 730 ℃ within 1h, preserving heat for 10h after heating to 710 ℃ to 730 ℃, and cooling the annealing furnace for 4.5h along with the furnace after preserving heat for 10h at the temperature of 710 ℃ to 730 ℃, sixthly, cooling the annealing furnace for 4.5 hours in a furnace cooling mode, then carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ in a water cooling mode, and finally discharging to obtain a softened and annealed coil;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
step five, rolling, namely transferring the acid-washed coil plate obtained after acid washing to a rolling mill production line through a hoisting device for rolling, and preparing a rolled coil plate, wherein the thickness of the rolled coil plate is 4 mm;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1h after heating to 400 ℃, secondly, preserving heat for 1h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 1h, preserving heat for 0.5h after heating to 640 ℃, then, preserving heat for 0.5h at the temperature of 640 ℃, heating the annealing furnace to 730 ℃ within 1h, preserving heat for 0.5h after heating to 730 ℃, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.5h after preserving heat for 0.5h at the temperature of 730 ℃, preserving heat for 10h after heating to 740 ℃ to 760 ℃, and fifthly, reducing the temperature of the annealing furnace to 550 ℃ to 600 ℃ in a furnace cooling mode after preserving heat for 10h at the temperature of 740 ℃ to 760 ℃, sixthly, after the temperature of the annealing furnace is reduced to 550-600 ℃ in a furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and after the temperature of the annealing furnace is reduced to 280 ℃, reducing the temperature of the annealing furnace from 280-80 ℃ in a water cooling mode, and finally discharging to obtain a spheroidizing annealing coil;
seventhly, finish rolling, namely transferring the spheroidizing annealing coiled plate obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling, and manufacturing a finish rolling coiled plate, wherein the thickness of the finish rolling coiled plate is 3.5 mm;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
Example two: as shown in fig. 1 and 2, a strip steel processing technology for a spring plate comprises the following steps:
step one, preparing raw materials, and selecting a hot rolled coil with the brand of SCM435, wherein the requirements of chemical components of the SCM435 hot rolled coil are as follows: 0.33 to 0.38 of C, 0.15 to 0.35 of Si, 0.60 to 0.90 of Mn, P: 0.030,. S: ≦ 0.030, Cr: 0.90 to 1.20, Ni: 0.25 ≦ Mo: 0.15 to 0.30; the mechanical property requirements of the hot-rolled coil of the SCM435 are as follows: the tensile strength is ≦ 1000 MPa; the requirements of the metallographic phase of the hot-rolled coil of the SCM435 are as follows: ferrite + pearlite structure and decarburized layer, when the thickness is larger than 5mm, the allowed decarburization is less than or equal to 1% t, wherein t is the thickness of a hot rolled steel plate, when the thickness is less than or equal to 5mm, the allowed decarburization is less than 50 μm, the banded structure is less than 2 grade, the fine system of inclusions is less than 2 grade, in the embodiment, the thickness of a hot rolled plate with the trade mark of SCM435 is 3mm to 8.0mm, preferably 5mm to 6 mm;
step two, slitting and splitting for the first time, and transferring the hot-rolled coiled plate prepared in the step one to a first large slitting production line through a hoisting device to perform slitting and splitting for the first time, wherein in order to facilitate subsequent process processing, the width direction of the hot-rolled coiled plate is reserved with a margin of about 0.5mm during slitting, and the thickness allowable deviation of the hot-rolled coiled plate meets the specification of GB/T709 and the convexity requirement: the thickness is less than or equal to 3.0mm, and the convexity is less than or equal to 40 μm; the thickness is 3mm to 8.0mm, the convexity is less than or equal to 60 micrometers, the thickness is more than 8.0mm, the convexity is less than or equal to 100 micrometers, bubbles, cracks, scabs, warping, pulling cracks and inclusions cannot be formed on the surface of the hot-rolled coil, the hot-rolled coil cannot be layered, and slight pockmarks, local deep pockmarks, small bubbles, slight scratches and roller indentations within a half of the thickness tolerance range are allowed on the surface; the edge of the hot-rolled coil is neat and has no saw-tooth shape, and the jumping of the reference end face of the blade is less than or equal to 0.06mm during longitudinal shearing;
step three, softening and annealing, transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1.8h after heating to 400 ℃, secondly, preserving heat for 1.8h at 400 ℃, heating the annealing furnace to 600 ℃ within 2.8h, preserving heat for 0.8h after heating to 600 ℃, secondly, preserving heat for 0.8h at 600 ℃, heating the annealing furnace to 690 ℃ within 1.8h, preserving heat for 0.8h after heating to 690 ℃, fourthly, preserving heat for 0.8h at 690 ℃, heating the annealing furnace to 710 ℃ to 730 ℃ within 1.8h, preserving heat for 11.2h after heating to 710 ℃ to 730 ℃, and cooling the annealing furnace for 5.2h in a furnace cooling manner after preserving heat for 11.2h at 710 ℃ to 730 ℃, sixthly, cooling the annealing furnace for 5.2 hours in a furnace cooling mode, then carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ in a water cooling mode, and finally discharging to obtain a softened and annealed coil;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
step five, rolling, namely transferring the acid-washed coil plate obtained after acid washing to a rolling mill production line through a hoisting device for rolling, and preparing a rolled coil plate, wherein the thickness of the rolled coil plate is 4 mm;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1.8h after heating to 400 ℃, then preserving heat for 1.8h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 2.5h, preserving heat for 0.6h after heating to 640 ℃, then heating the annealing furnace to 730 ℃ within 1.8h, preserving heat for 0.6h after heating to 730 ℃, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.6h after preserving heat for 0.6h at the temperature of 730 ℃, preserving heat for 12h after heating to 740 ℃ to 760 ℃, and fifthly, reducing the temperature of the annealing furnace to 550 ℃ to 600 ℃ in a furnace cooling mode after preserving heat for 12h at the temperature of 740 ℃ to 760 ℃ with furnace, sixthly, after the temperature of the annealing furnace is reduced to 550-600 ℃ in a furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and after the temperature of the annealing furnace is reduced to 280 ℃, reducing the temperature of the annealing furnace from 280-80 ℃ in a water cooling mode, and finally discharging to obtain a spheroidizing annealing coil;
seventhly, finish rolling, namely transferring the spheroidizing annealing coiled plate obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling, and manufacturing a finish rolling coiled plate, wherein the thickness of the finish rolling coiled plate is 3.5 mm;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
Example three: as shown in fig. 1 and 2, a strip steel processing technology for a spring plate comprises the following steps:
step one, preparing raw materials, and selecting a hot rolled coil with the brand of SCM435, wherein the requirements of chemical components of the SCM435 hot rolled coil are as follows: 0.33 to 0.38 of C, 0.15 to 0.35 of Si, 0.60 to 0.90 of Mn, P: 0.030,. S: ≦ 0.030, Cr: 0.90 to 1.20, Ni: 0.25 ≦ Mo: 0.15 to 0.30; the mechanical property requirements of the hot-rolled coil of the SCM435 are as follows: the tensile strength is ≦ 1000 MPa; the requirements of the metallographic phase of the hot-rolled coil of the SCM435 are as follows: ferrite + pearlite structure and decarburized layer, when the thickness is larger than 5mm, the allowed decarburization is less than or equal to 1% t, wherein t is the thickness of a hot rolled steel plate, when the thickness is less than or equal to 5mm, the allowed decarburization is less than 50 μm, the banded structure is less than 2 grade, the fine system of inclusions is less than 2 grade, in the embodiment, the thickness of a hot rolled plate with the trade mark of SCM435 is 3mm to 8.0mm, preferably 5mm to 6 mm;
step two, slitting and splitting for the first time, and transferring the hot-rolled coiled plate prepared in the step one to a first large slitting production line through a hoisting device to perform slitting and splitting for the first time, wherein in order to facilitate subsequent process processing, the width direction of the hot-rolled coiled plate is reserved with a margin of about 0.5mm during slitting, and the thickness allowable deviation of the hot-rolled coiled plate meets the specification of GB/T709 and the convexity requirement: the thickness is less than or equal to 3.0mm, and the convexity is less than or equal to 40 μm; the thickness is 3mm to 8.0mm, the convexity is less than or equal to 60 micrometers, the thickness is more than 8.0mm, the convexity is less than or equal to 100 micrometers, bubbles, cracks, scabs, warping, pulling cracks and inclusions cannot be formed on the surface of the hot-rolled coil, the hot-rolled coil cannot be layered, and slight pockmarks, local deep pockmarks, small bubbles, slight scratches and roller indentations within a half of the thickness tolerance range are allowed on the surface; the edge of the hot-rolled coil is neat and has no saw-tooth shape, and the jumping of the reference end face of the blade is less than or equal to 0.06mm during longitudinal shearing;
step three, softening and annealing, transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 2.4h after heating to 400 ℃, secondly, preserving heat for 2.4h at 400 ℃, heating the annealing furnace to 600 ℃ within 3.4h, preserving heat for 1.2h after heating to 600 ℃, secondly, after preserving heat for 1.2h at 600 ℃, heating the annealing furnace to 690 ℃ within 2.4h, preserving heat for 1.2h after heating to 690 ℃, fourthly, after preserving heat for 1.2h at 690 ℃, heating the annealing furnace to 710 ℃ to 730 ℃ within 2.4h, preserving heat for 15.6h after heating to 710 ℃ to 730 ℃, and cooling the annealing furnace for 6.4h in a furnace cooling mode, sixthly, cooling the annealing furnace for 6.4 hours in a furnace cooling mode, then carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ in a water cooling mode, and finally discharging to obtain a softened and annealed coil;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
step five, rolling, namely transferring the acid-washed coil plate obtained after acid washing to a rolling mill production line through a hoisting device for rolling, and preparing a rolled coil plate, wherein the thickness of the rolled coil plate is 4 mm;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 2.4h after heating to 400 ℃, then preserving heat for 2.4h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 3.2h, preserving heat for 1.2h after heating to 640 ℃, then heating the annealing furnace to 730 ℃ within 2.4h, preserving heat for 1.2h after heating to 730 ℃, heating the annealing furnace to 740 to 760 ℃ within 1.2h after preserving heat for 1.2h at the temperature of 730 ℃, preserving heat for 14h after heating to 740 to 760 ℃, and fifthly, reducing the temperature of the annealing furnace to 550 ℃ to 600 ℃ in a furnace cooling way after preserving heat for 14h at the temperature of 740 to 760 ℃ with furnace, sixthly, after the temperature of the annealing furnace is reduced to 550-600 ℃ in a furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and after the temperature of the annealing furnace is reduced to 280 ℃, reducing the temperature of the annealing furnace from 280-80 ℃ in a water cooling mode, and finally discharging to obtain a spheroidizing annealing coil;
seventhly, finish rolling, namely transferring the spheroidizing annealing coiled plate obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling, and manufacturing a finish rolling coiled plate, wherein the thickness of the finish rolling coiled plate is 3.5 mm;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
Example four: as shown in fig. 1 and 2, a strip steel processing technology for a spring plate comprises the following steps:
step one, preparing raw materials, and selecting a hot rolled coil with the brand of SCM435, wherein the requirements of chemical components of the SCM435 hot rolled coil are as follows: 0.33 to 0.38 of C, 0.15 to 0.35 of Si, 0.60 to 0.90 of Mn, P: 0.030,. S: ≦ 0.030, Cr: 0.90 to 1.20, Ni: 0.25 ≦ Mo: 0.15 to 0.30; the mechanical property requirements of the hot-rolled coil of the SCM435 are as follows: the tensile strength is ≦ 1000 MPa; the requirements of the metallographic phase of the hot-rolled coil of the SCM435 are as follows: ferrite + pearlite structure and decarburized layer, when the thickness is larger than 5mm, the allowed decarburization is less than or equal to 1% t, wherein t is the thickness of a hot rolled steel plate, when the thickness is less than or equal to 5mm, the allowed decarburization is less than 50 μm, the banded structure is less than 2 grade, the fine system of inclusions is less than 2 grade, in the embodiment, the thickness of a hot rolled plate with the trade mark of SCM435 is 3mm to 8.0mm, preferably 5mm to 6 mm;
step two, slitting and splitting for the first time, and transferring the hot-rolled coiled plate prepared in the step one to a first large slitting production line through a hoisting device to perform slitting and splitting for the first time, wherein in order to facilitate subsequent process processing, the width direction of the hot-rolled coiled plate is reserved with a margin of about 0.5mm during slitting, and the thickness allowable deviation of the hot-rolled coiled plate meets the specification of GB/T709 and the convexity requirement: the thickness is less than or equal to 3.0mm, and the convexity is less than or equal to 40 μm; the thickness is 3mm to 8.0mm, the convexity is less than or equal to 60 micrometers, the thickness is more than 8.0mm, the convexity is less than or equal to 100 micrometers, bubbles, cracks, scabs, warping, pulling cracks and inclusions cannot be formed on the surface of the hot-rolled coil, the hot-rolled coil cannot be layered, and slight pockmarks, local deep pockmarks, small bubbles, slight scratches and roller indentations within a half of the thickness tolerance range are allowed on the surface; the edge of the hot-rolled coil is neat and has no saw-tooth shape, and the jumping of the reference end face of the blade is less than or equal to 0.06mm during longitudinal shearing;
step three, softening and annealing, namely transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 5h after heating to 400 ℃, secondly, preserving heat for 5h at 400 ℃, heating the annealing furnace to 600 ℃ within 6h, preserving heat for 4h after heating to 600 ℃, then, preserving heat for 4h at 600 ℃, heating the annealing furnace to 690 ℃ within 5h, preserving heat for 4h after heating to 690 ℃, fourthly, preserving heat for 4h at 690 ℃, heating the annealing furnace to 710 ℃ to 730 ℃ within 5h, preserving heat for 18h after heating to 710 ℃ to 730 ℃, and fifthly, cooling the annealing furnace for 7.2h in a furnace cooling mode after preserving heat for 18h at 710 ℃ to 730 ℃, sixthly, cooling the annealing furnace for 7.2 hours in a furnace cooling mode, then carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ in a water cooling mode, and finally discharging to obtain a softened and annealed coil;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
step five, rolling, namely transferring the acid-washed coil plate obtained after acid washing to a rolling mill production line through a hoisting device for rolling, and preparing a rolled coil plate, wherein the thickness of the rolled coil plate is 4 mm;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 5h after heating to 400 ℃, then preserving heat for 5h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 6h, preserving heat for 4h after heating to 640 ℃, then preserving heat for 4h at the temperature of 640 ℃, heating the annealing furnace to 730 ℃ within 4h, preserving heat for 5h after heating to 730 ℃, fourthly, preserving heat for 5h at the temperature of 730 ℃, heating the annealing furnace to 740 ℃ to 760 ℃ within 2h, preserving heat for 16h after heating to 740 ℃ to 760 ℃, and preserving heat for 16h at the temperature of 740 ℃ to 760 ℃, and fifthly, reducing the temperature of the annealing furnace to 550 ℃ to 600 ℃ in a furnace cooling mode, sixthly, after the temperature of the annealing furnace is reduced to 550-600 ℃ in a furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and after the temperature of the annealing furnace is reduced to 280 ℃, reducing the temperature of the annealing furnace from 280-80 ℃ in a water cooling mode, and finally discharging to obtain a spheroidizing annealing coil;
seventhly, finish rolling, namely transferring the spheroidizing annealing coiled plate obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling, and manufacturing a finish rolling coiled plate, wherein the thickness of the finish rolling coiled plate is 3.5 mm;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
Example five: as shown in fig. 1 and 2, a strip steel processing technology for a spring plate comprises the following steps:
step one, preparing raw materials, and selecting a hot rolled coil with the brand of SCM435, wherein the requirements of chemical components of the SCM435 hot rolled coil are as follows: 0.33 to 0.38 of C, 0.15 to 0.35 of Si, 0.60 to 0.90 of Mn, P: 0.030,. S: ≦ 0.030, Cr: 0.90 to 1.20, Ni: 0.25 ≦ Mo: 0.15 to 0.30; the mechanical property requirements of the hot-rolled coil of the SCM435 are as follows: the tensile strength is ≦ 1000 MPa; the requirements of the metallographic phase of the hot-rolled coil of the SCM435 are as follows: ferrite + pearlite structure and decarburized layer, when the thickness is larger than 5mm, the allowed decarburization is less than or equal to 1% t, wherein t is the thickness of a hot rolled steel plate, when the thickness is less than or equal to 5mm, the allowed decarburization is less than 50 μm, the banded structure is less than 2 grade, the fine system of inclusions is less than 2 grade, in the embodiment, the thickness of a hot rolled plate with the trade mark of SCM435 is 3mm to 8.0mm, preferably 5mm to 6 mm;
step two, slitting and splitting for the first time, and transferring the hot-rolled coiled plate prepared in the step one to a first large slitting production line through a hoisting device to perform slitting and splitting for the first time, wherein in order to facilitate subsequent process processing, the width direction of the hot-rolled coiled plate is reserved with a margin of about 0.5mm during slitting, and the thickness allowable deviation of the hot-rolled coiled plate meets the specification of GB/T709 and the convexity requirement: the thickness is less than or equal to 3.0mm, and the convexity is less than or equal to 40 μm; the thickness is 3mm to 8.0mm, the convexity is less than or equal to 60 micrometers, the thickness is more than 8.0mm, the convexity is less than or equal to 100 micrometers, bubbles, cracks, scabs, warping, pulling cracks and inclusions cannot be formed on the surface of the hot-rolled coil, the hot-rolled coil cannot be layered, and slight pockmarks, local deep pockmarks, small bubbles, slight scratches and roller indentations within a half of the thickness tolerance range are allowed on the surface; the edge of the hot-rolled coil is neat and has no saw-tooth shape, and the jumping of the reference end face of the blade is less than or equal to 0.06mm during longitudinal shearing;
step three, softening and annealing, namely transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 2h after heating to 400 ℃, secondly, preserving heat for 2h at 400 ℃, heating the annealing furnace to 600 ℃ within 3h, preserving heat for 1h after heating to 600 ℃, then, preserving heat for 1h at 600 ℃, heating the annealing furnace to 690 ℃ within 2h, preserving heat for 1h after heating to 690 ℃, fourthly, preserving heat for 1h at 690 ℃, heating the annealing furnace to 710 ℃ to 730 ℃ within 2h, preserving heat for 13h after heating to 710 ℃ to 730 ℃, and fifthly, cooling the annealing furnace for 6h in a furnace cooling manner after preserving heat for 13h at 710 ℃ to 730 ℃, sixthly, cooling the annealing furnace for 6 hours in a furnace cooling mode, then carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ in a water cooling mode, and finally discharging to obtain a softened and annealed coil;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
step five, rolling, namely transferring the acid-washed coil plate obtained after acid washing to a rolling mill production line through a hoisting device for rolling, and preparing a rolled coil plate, wherein the thickness of the rolled coil plate is 4 mm;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 2h after heating to 400 ℃, then preserving heat for 2h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 3h, preserving heat for 1h after heating to 640 ℃, then preserving heat for 1h at the temperature of 640 ℃, heating the annealing furnace to 730 ℃ within 2h, preserving heat for 1h after heating to 730 ℃, fourthly, preserving heat for 1h at the temperature of 730 ℃, heating the annealing furnace to 740 to 760 ℃ within 1h, preserving heat for 12h after heating to 740 to 760 ℃, and fifthly, preserving heat for 12h at the temperature of 740 to 760 ℃, reducing the temperature of the annealing furnace to 550 ℃ to 600 ℃ in a furnace cooling mode, sixthly, after the temperature of the annealing furnace is reduced to 550-600 ℃ in a furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and after the temperature of the annealing furnace is reduced to 280 ℃, reducing the temperature of the annealing furnace from 280-80 ℃ in a water cooling mode, and finally discharging to obtain a spheroidizing annealing coil;
seventhly, finish rolling, namely transferring the spheroidizing annealing coiled plate obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling, and manufacturing a finish rolling coiled plate, wherein the thickness of the finish rolling coiled plate is 3.5 mm;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
In the present invention, according to the technical solution of the fifth preferred embodiment, specific operation flows of softening annealing and spheroidizing annealing are established according to the thickness of the corresponding hot rolled coil, so as to effectively control the stability of the quality of the produced product and the performance of the product, and when the thickness of the hot rolled coil changes, the operation flows of softening annealing and spheroidizing annealing also need to change.
In the softening annealing, a detonation test is required before the temperature is raised, so that the purity of the hydrogen in the ammonia decomposition furnace is ensured; in the whole temperature rising and preserving process, the difference value of the actual temperature value and the process temperature value is less than 15 ℃, the actual temperature value is measured by a thermocouple, the detection frequency is 1 time/1 h, and in addition, a heat preserving platform can be properly added in the temperature rising process to meet the theoretical speed rising.
In spheroidizing annealing, a detonation test is required before temperature rise is carried out, and the purity of hydrogen in the ammonia decomposition furnace is ensured; in the whole temperature rising and preserving process, the difference value of the actual temperature value and the process temperature value is less than 15 ℃, the actual temperature value is measured by a thermocouple, the detection frequency is 1 time/1 h, and in addition, a heat preserving platform can be properly added in the temperature rising process to meet the theoretical speed rising.
The strip steel needs to be detected twice in the whole production process, wherein before pickling, the nodularity of the softening and annealing coil plate is detected by a metallographic microscope, and the qualified softening and annealing coil plate is put on a pickling production line, wherein the standard for judging whether the softening and annealing coil plate is qualified in the detection process of the nodularity is in grade 5 or grade 6 of the nodularity of the medium-carbon alloy structural steel in JB/T5074 and 2007 standard components; in the other time, before the second longitudinal shearing and splitting, the hardness of the finish-rolled coiled plate is detected through a universal testing machine and a hardness meter, and the qualified range of the hardness value of the finish-rolled coiled plate is 75HRB to 85 HRB; and performing metallographic detection on the finish-rolled coil with qualified hardness value, and putting the finish-rolled coil with qualified metallographic detection on a small slitting machine, wherein the metallographic detection refers to the regulation of JB/T5074-2007, and is shown in figure 3.
Rust-proof oil is needed to be coated on the slitting and rolling plate when slitting and slitting are carried out for the second time; when the second longitudinal shearing splitting is carried out, bubbles, cracks, scabs, warping, pulling cracks and inclusions cannot exist on the surface of the hot-rolled coil, the hot-rolled coil cannot be layered, and slight pits, local deep pits, small bubbles, slight scratches and roller indentations within a half of the thickness tolerance range are allowed on the surface; the edge of the hot-rolled coil is neat and has no saw tooth, and the reference end face runout of the blade is less than or equal to 0.06 mm.
The surface of the rolled coil obtained in the rolling process has no warping, pits, pockmarks, yellow rust, water rust, scratches and straight plate shape; side part: no napping and broken edges. The surface of the split rolled plate obtained by the second longitudinal shearing splitting has no warping, pockmarks, pits, water rust, scratches, yellow rust, impression, flat and straight plate shape and no broken edges at the edge part; and (3) applying anti-rust oil to the slitting and rolling plate when slitting and slitting are carried out for the second time.
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 to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. A strip steel processing technology for a spring piece is characterized by comprising the following steps:
preparing raw materials, and selecting a hot-rolled coil with the brand number of SCM 435;
step two, carrying out primary longitudinal shearing and splitting, and transferring the hot-rolled coil prepared in the step one to a first large longitudinal shearing production line through a hoisting device to carry out primary longitudinal shearing and splitting, wherein when the hot-rolled coil is longitudinally sheared, a margin of 0.5mm is reserved in the width direction;
step three, softening and annealing, transferring the hot-rolled coil subjected to the first longitudinal shearing and splitting into strips into an annealing furnace/ammonia decomposition furnace through a hoisting device, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1.8h to 2.4h after heating to 400 ℃, then preserving heat for 1.8h to 2.4h at the temperature of 400 ℃, heating the annealing furnace to 600 ℃ within 1h to 2.8h, preserving heat for 0.5h to 4h after heating to 600 ℃, then preserving heat for 0.5h to 4h at the temperature of 600 ℃, heating the annealing furnace to 690 ℃ within 1.8h to 5h, preserving heat for 0.5h to 4h after heating to 690 ℃, fourth, preserving heat for 0.5h to 4h at the temperature of 690 ℃, heating the annealing furnace to 710 ℃ to 730 ℃ within 1h to 5h, preserving heat for 10h to 18h after heating to 710 ℃ to 730 ℃, and preserving heat for 10h to 730 h after fifth, preserving heat for 10h to 710 ℃ to 730 h, cooling the annealing furnace for 6.4 to 8 hours in a furnace cooling mode, sixthly, cooling the annealing furnace for 6.4 to 8 hours in a furnace cooling mode, then carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, and seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ in a water cooling mode, and finally discharging to obtain a softened annealed coil;
step four, acid washing, namely transferring the softened and annealed coil plate obtained by softening and annealing to an acid washing production line through a hoisting device for acid washing to obtain an acid-washed coil plate;
fifthly, rolling, namely transferring the acid-washed coil plate obtained after acid washing to a rolling mill production line through a hoisting device for rolling, and obtaining a rolled coil plate, wherein the thickness of the rolled coil plate is 4 mm;
sixthly, spheroidizing annealing, transferring the rolled coil obtained after rolling into an annealing furnace/ammonia decomposition furnace through a hoisting device for spheroidizing annealing, firstly heating the annealing furnace to 400 ℃ at full speed, preserving heat for 1h to 5h after heating to 400 ℃, then preserving heat for 1h to 5h at the temperature of 400 ℃, heating the annealing furnace to 640 ℃ within 1h to 6h, preserving heat for 0.5h to 4h after heating to 640 ℃, then preserving heat for 0.5h to 4h at the temperature of 640 ℃, heating the annealing furnace to 730 ℃ within 1h to 5h, preserving heat for 0.5h to 4h after heating to 730 ℃, fourthly, preserving heat for 0.5h to 4h at the temperature of 730 ℃, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.5h to 2h, preserving heat for 10h to 16h after heating to 740 ℃ to 760 ℃, and preserving heat for 10h to 16h at the temperature of 740 ℃ to 760 ℃ and preserving heat for 10h to 16h, reducing the temperature of the annealing furnace to 550-600 ℃ by a furnace cooling mode, sixth, after reducing the temperature of the annealing furnace to 550-600 ℃ by the furnace cooling mode, carrying out cover changing air cooling on the annealing furnace, reducing the temperature of the annealing furnace to 280 ℃, seventh, reducing the temperature of the annealing furnace to 280 ℃, then reducing the temperature of the annealing furnace from 280 ℃ to 80 ℃ by a water cooling mode, and finally discharging to obtain a spheroidizing annealing coiled plate;
step seven, finish rolling, namely transferring the spheroidizing annealed coil obtained after spheroidizing annealing to a rolling mill production line through a hoisting device for finish rolling to obtain a finish rolled coil;
step eight, carrying out secondary longitudinal shearing and splitting, and transferring the finish-rolled coil obtained by finish rolling to a small splitting machine through a hoisting device to carry out secondary longitudinal shearing and splitting, and preparing a split coil;
and step nine, packaging and warehousing, and packaging the split coiled plates obtained after the secondary longitudinal shearing and splitting by using a packaging machine.
2. The strip steel processing technology for the spring plate as claimed in claim 1, wherein in the softening annealing, a detonation test is required before the temperature rise is carried out to ensure the purity of hydrogen in the ammonia decomposition furnace; in the whole temperature rising and preserving process, the difference value of the actual temperature value and the process temperature value is less than 15 ℃.
3. The strip steel processing technology for spring pieces as claimed in claim 1, wherein in the fourth step, before pickling, a metallographic microscope is used to detect the spheroidization rate of the softened and annealed coils, and the softened and annealed coils which are qualified in detection are put into a pickling production line.
4. The strip steel processing technology for spring pieces as claimed in claim 1, wherein in the fourth step, when pickling, the negative difference of the thickness of the softened and annealed rolled plate before and after pickling is less than 0.15mm, the number of pickling tanks is two, the number of passivation tank is one, the number of neutralization tank is one, the pickling concentrations of the two pickling tanks are respectively 18% to 22% and 15% to 18%, the acid positions in the two pickling tanks are 380mm to 420mm, the acid liquid temperature is 53 ℃ to 72 ℃, the pH value of the neutralization tank is 11 to 13, the pH value of the passivation tank is 7 to 8, the temperature value of the passivation tank is 38 ℃ to 51 ℃, and the cleaning speed of the pickling line is 5m/min to 15 m/min.
5. The strip steel processing technology for the spring lamination as claimed in claim 1, wherein during the spheroidizing annealing, the annealing furnace is heated to 400 ℃ at full speed, and is kept at the temperature for 1.8 to 2.4 hours after being heated to 400 ℃; keeping the temperature of the annealing furnace at 400 ℃ for 1.8 to 2.4 hours, heating the annealing furnace to 640 ℃ within 2.5 to 3.2 hours, and keeping the temperature for 0.6 to 1.2 hours after the temperature is raised to 640 ℃; keeping the temperature of the annealing furnace at 640 ℃ for 0.6 to 1.2 hours, heating the annealing furnace to 730 ℃ within 1.8 to 2.4 hours, and keeping the temperature for 0.6 to 1.2 hours after the temperature is raised to 730 ℃; keeping the temperature of the annealing furnace at 730 ℃ for 0.6h to 1.2h, heating the annealing furnace to 740 ℃ to 760 ℃ within 0.6h to 1.2h, and keeping the temperature for 12h to 13.5h after heating to 740 ℃ to 760 ℃.
6. The strip steel processing technology for spring pieces according to claim 1, 4 or 5, characterized in that in the spheroidizing annealing, a detonating test is required before temperature rise is carried out to ensure the purity of hydrogen in the ammonia decomposition furnace; in the whole temperature rising and preserving process, the difference value of the actual temperature value and the process temperature value is less than 15 ℃.
7. The strip steel processing technology for the spring plate as claimed in claim 1, wherein in the eighth step, before the second slitting, the hardness of the finish-rolled plate needs to be detected by using a universal testing machine and a hardness tester, and the qualified range of the hardness value of the finish-rolled plate is 75HRB to 85 HRB; and performing metallographic detection on the finish-rolled coiled plate with qualified hardness value, and putting the finish-rolled coiled plate with qualified metallographic detection on a small slitting machine.
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