CN113604750B - Strip steel and production method thereof - Google Patents
Strip steel and production method thereof Download PDFInfo
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- CN113604750B CN113604750B CN202110762502.8A CN202110762502A CN113604750B CN 113604750 B CN113604750 B CN 113604750B CN 202110762502 A CN202110762502 A CN 202110762502A CN 113604750 B CN113604750 B CN 113604750B
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- 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
-
- 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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
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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
- 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
- C21D8/0226—Hot rolling
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with 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
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The strip steel is characterized by comprising the following chemical components, by weight, 0.04-0.07% of C, 1.0-1.30% of Mn, less than or equal to 0.003% of S, less than or equal to 0.018% of P, 0.08-0.15% of Si, 0.020-0.040% of Als, 0.085-0.105% of Ti, less than or equal to 0.0045% of N, 0.10-0.30% of Cr, and the balance of Fe and inevitable impurities, wherein the content of Cr, C and Ti in the steel meets the following formula 1: Cr/10.1-C-Ti/4-Cr/6.5 (1). Compared with the conventional 700 MPa-grade girder steel, the process disclosed by the invention has the advantages that cheap Ti is used for replacing Nb alloy, a Ti and Cr component system is adopted, and meanwhile, Mn, C and other alloys are reduced, so that the alloy cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of steel plate production, and particularly relates to strip steel and a production method thereof.
Background
700MPa level high strength is girder steel for car, and low reaches deep-processing flow is crosscut, rip cutting, bending, welding etc. because of it is the bearing member of freight train, for guaranteeing safety, this product is higher to the formability of coil of strip, the structural stability requirement, simultaneously because of its processing requirement, also comparatively strict to hot rolled plate coil shape quality requirement, and delivery after thin specification girder steel is mostly level, whole manufacturing cost is higher.
The 700MPa grade high-strength beam steel for automobiles mostly adopts Nb and Ti microalloying in component design to achieve the purposes of meeting the strength and having excellent forming performance, but the Nb-added component design has higher smelting cost, and Nb has stronger effects of fine grain strengthening and precipitation strengthening than Ti, particularly Nb is precipitated in a large amount at about 950 ℃, so that the deformation resistance of a rolled piece is increased rapidly, the rolling force of a rack after finish rolling is increased greatly, the influence on the rolling stability of a thin-specification plate coil is larger, steel piling and steel blocking accidents are easy to occur in the production process, and the rapid increase of the rolling force easily causes insufficient compensation of the bending force, the defect of double-side waves of the plate strip is finally formed, and the use of downstream users is influenced.
Disclosure of Invention
Based on the technical problems, the invention provides the strip steel and the production method thereof, which reduce or avoid steel stacking and clamping accidents in the production process, and meanwhile, the strip steel has good mechanical properties and plate shapes.
In order to solve the technical problems, the technical scheme of the invention is as follows: a strip steel comprises the following chemical components, by weight, 0.04-0.07% of C, 1.0-1.30% of Mn, less than or equal to 0.003% of S, less than or equal to 0.018% of P, 0.08-0.15% of Si, 0.020-0.040% of Als, 0.085-0.105% of Ti, less than or equal to 0.0045% of N, 0.10-0.30% of Cr, and the balance of Fe and inevitable impurities, wherein the content of Cr, C and Ti in the steel satisfies the following formula 1:
Cr/10.1-C-Ti/4-Cr/6.5 (1).
Further, the ferrite content in the steel is 78-88% by area.
The production method of the strip steel adopts laminar cooling in the hot rolling and cooling process of the strip steel, wherein the laminar cooling sequentially comprises an encryption cold section, a rough adjustment section and a fine adjustment section, the finishing temperature of the encryption cold section is 710-750 ℃, the strip steel is air-cooled for 5-8 seconds after the encryption cold section is finished, and the coiling temperature of the strip steel is 610-650 ℃.
Further, the cooling rate ratio of the laminar cooling encryption cold section to the fine adjustment section is 1: 2-1: 4.
further, the cooling rate ratio of the upper header to the lower header of the cold section is 1: 1.5-1: 2.5; in the coarse adjustment section and the fine adjustment section, the cooling rates of the upper collecting pipe and the lower collecting pipe are 1: 3-1: 5.
further, the coiling temperature of the strip steel is adjusted according to the thickness h of the strip steel, and if h is less than 1.6mm, the coiling temperature is 630-650 ℃; if h is more than or equal to 1.6mm and less than 4.0mm, the coiling temperature is 610-630 ℃.
Further, in the finish rolling process, the roller bending force is adjusted, if the thickness h of the strip steel is more than or equal to 1.2 and less than 1.8mm, the roller bending force of F2-F3 rollers is reduced and the roller bending force of F5-F7 rollers is increased after the plate coil is cut by flying shears; if the thickness h of the strip steel is more than or equal to 1.8 and less than 4mm, reducing the bending force of the F3 bending roll and increasing the bending force of the F6-F7 bending roll after the plate coil is rolled in the F1 bending roll and is thrown.
Furthermore, the reduction amount of the bending force of the bending rolls F1-F3 is 7-9% of the set value of the bending force of the frame, and the maximum reduction amount is not more than 250 KN; the roll bending force increment of the roll bending machines from F5 to F7 is 11 to 13 percent of the roll bending force set value of the frame, and the maximum roll bending force increment does not exceed 150 KN.
Furthermore, the inlet temperature of finish rolling is controlled to be 1080-1130 ℃, and the finishing temperature is controlled to be 870-910 ℃.
The thickness of the strip steel refers to the thickness of a finished product of the strip steel after rolling is finished.
The finishing mill bending roll is arranged as follows: and 7 rolling mills in total are used for finish rolling, each rolling mill is provided with a bending roll system, positive bending and negative bending are designed to be beneficial to controlling the shape of the plate strip in the rolling process, and the bending roll systems of the 7 rolling mills are sequentially called F1-F7 bending rolls from the start of finish rolling to the end of finish rolling.
In the steel plate cooling process, the laminar cooling is arranged as follows: the laminar cooling comprises 18 groups of laminar cooling devices in total, wherein from the start of laminar cooling to the end of laminar cooling, the first 4 groups are encryption cold sections, 5-15 groups are rough adjusting sections, and 16-18 groups are fine adjusting sections.
Compared with the conventional 700 MPa-level girder steel, the chemical component design of the invention removes Nb, uses Ti and Cr component systems, and simultaneously reduces Mn, C and other alloys. The method is characterized in that Cr replaces part of Mn, expensive Nb or Mo alloy is cancelled, and high strength is realized by means of fine grain strengthening and precipitation strengthening of Ti. Cr is used for replacing Mn to promote the formation of a ferrite phase and postpone the transformation of bainite, so that the formation of upper bainite is avoided, Cr carbide can inhibit the increase of the size of TiC, the nano precipitation strengthening effect of TiC is improved, and the addition of elements such as Cr, C, Ti and the like is controlled to meet the formula of Cr/10.1-C-Ti/4-Cr/6.5. Meanwhile, the characteristic of longer layer cold line of a conventional hot rolling production line is fully utilized, the front-section encrypted cold section is adopted to be rapidly cooled to be near the nose tip temperature of a C curve converted by ferrite, then the conventional layer cold section is subjected to air cooling for a long time (5-8 seconds) without boiled water, the ferrite phase change is at the peak value at the moment, the ferrite phase change can induce Ti (C, N) to be separated out, and the separation strengthening effect of the Ti (C, N) of 5-10 nm is fully exerted; the cooling speed during ferrite phase transition is reduced, the cooling stress can be reduced, and the plate shape quality is improved. Meanwhile, the content of ferrite in the steel is about 78-88%, the steel has excellent hole expansion and flanging performance, the hole expansion rate is 60-90%, and the cracking of the formed W-shaped through beam and other complex flanging forming parts is avoided.
According to the hot rolling and cooling process design, a high-temperature start rolling and high-temperature finish rolling mode is adopted, the finish rolling inlet temperature is controlled to be 1080-1130 ℃, the finish rolling temperature is controlled to be 870-910 ℃, so that the deformation resistance of a material in a finish rolling area is reduced, and easy rolling and plate shape control are realized. The finish temperature of the laminar cooling and the encrypted cooling is controlled to be 710-750 ℃ so as to promote ferrite phase change and induce TiC to precipitate, and meanwhile, when the cooling rate is set, the cooling rate of the fine adjustment section is enhanced, and the setting ratio of the cooling rate of the encrypted cooling to the cooling rate of the fine adjustment section is 1: 2-1: and 4, acicular ferrite with better strength and toughness is obtained, the coiling temperature is 610-650 ℃, the precipitation amount and the grain size of TiC in ferrite crystal are ensured, the layer cooling temperature is higher than 650 ℃, the precipitation size of TiC is large, the toughness is poor and is lower than 610 ℃, the precipitation size of TiC is small, the precipitation time is short, the precipitation amount is insufficient, and the mechanical property can not meet the requirements of users. And controlling the precipitated TiC at a target coiling temperature of 610-650 ℃, reducing strength fluctuation caused by different specifications, and realizing stable strength performance of the titanium microalloy high-strength steel.
The thin-gauge plate coil is subjected to high-temperature finish rolling, so that TiC is favorably precipitated, the laminar cooling speed is increased, the hardenability of Cr is fully exerted, and the strength is improved; secondly, the stability of rolling is promoted, and the shape quality of the strip coil is ensured; high-temperature coiling is adopted, and firstly, the higher the temperature is, the better the shape of the coiled strip is; secondly, the cooling speed is too fast after the coiling of the thin specification, if the coiling is carried out at low temperature, the TiC precipitation amount is insufficient, the product performance can not meet the requirement, the temperature range of TiC precipitation can be enlarged and the time is prolonged in the coiling at high temperature, the precipitation amount is increased, and the strength is improved.
Meanwhile, in the production process, due to the fact that the thin-specification rolling time is long, the roller is abraded and absorbs much heat, the problem of insufficient roll bending force compensation is prone to occurring during rolling, the defects of middle wave in the front frame number and double side in the rear frame number of the strip are often shown, and therefore the roll bending compensation control function is added to the strip tail according to the thin-specification rolling characteristics. A compensation function of a bending roll with the tail is added in the primary control program, if the thickness h of the strip steel is more than or equal to 1.2 and less than 1.8mm, the bending roll force of the bending roll F2-F3 is reduced and the bending roll force of the bending roll F5-F7 is increased after the plate coil is subjected to flying shear tail cutting; if the thickness h of the strip steel is more than or equal to 1.8 and less than 4mm, reducing the bending force of the F3 bending roll and increasing the bending force of the F6-F7 bending roll after the plate coil is rolled in the F1 bending roll and is thrown. The reduction of the bending force of the bending rolls from F2 to F3 is 7 to 9 percent of the set value of the bending force of the frame, and the maximum reduction is not more than 250 KN; the roll bending force increment of the roll bending machines from F5 to F7 is 11 to 13 percent of the roll bending force set value of the frame, and the maximum roll bending force increment does not exceed 150 KN. After the rolling method is implemented, the rolling stability and the strip shape quality of the strip coil are greatly improved, and the aim that the use requirement of a user can be met when the thin-specification strip coil is not flat is achieved.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. the smelting cost is low: compared with the conventional 700 MPa-grade girder steel, the process disclosed by the invention has the advantages that cheap Ti is used for replacing Nb alloy, a Ti and Cr component system is adopted, and meanwhile, Mn, C and other alloys are reduced, so that the alloy cost is greatly reduced.
2. The rolling cost is low, and the production stability is good: because the alloy content is lower than that of the conventional 700MPa grade girder steel, especially the content of Mn and Nb is reduced and removed, the deformation resistance of the material in a finish rolling area is reduced, and the thin specification of the rolling process adopts high-temperature rolling and high-temperature coiling processes, so that the rolling load of the finish rolling area is comprehensively reduced by 13-15%, the rolling stability of the thin specification is greatly improved, the steel piling and blocking rate is reduced to 0.6% from the previous 5%, the power consumption and the water consumption are also greatly reduced, and the rolling cost is reduced.
3. The coiled strip plate is good: the design of lower alloy content and the rolling process at higher temperature reduce the deformation resistance of rolled pieces, are easy to form strip steel in a frame, are beneficial to obtaining better plate shape quality, and meanwhile, the cooling process avoids a phase change point temperature interval to carry out cooling, thereby reducing the internal stress caused by the volume change of crystal grains in the phase change process, and in the production process, the problems of insufficient roll force compensation during rolling due to long rolling time of thin specifications, more roll abrasion and heat absorption are considered, the compensation function of a tail bending roll is added in a primary control program, the tail deviation and wave shape are effectively prevented, the straightness of the specification with the thickness of 1.2-4.0mm meets the requirement of a downstream user without flattening, and the goal that the thickness of the specification with the thickness of less than 4.0mm can meet the use requirement of the downstream user without flattening is realized.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples 1 to 8
The method comprises the following steps of continuously casting molten steel with the component content shown in the table 1 to obtain a plate blank, heating the plate blank, carrying out hot rolling and cooling, wherein the finish rolling inlet temperature and the finish rolling temperature in the hot rolling process are shown in the table 2, laminar cooling is adopted in the cooling process, air cooling is carried out for a long time after a cold section is encrypted in the laminar cooling process, the water cooling finishing temperature of the encrypted cold section, the air cooling time, the strip steel coiling temperature, the cooling rate ratio of an upper collecting pipe and a lower collecting pipe in each cooling section, and the cooling rate ratio of the encrypted cold section and the fine adjustment section are shown in the table 2, and the thickness specification of produced strip steel is also shown in the table 2. The roll bending is controlled in a compensating manner during the rolling process, i.e. the roll bending force is adjusted during the rolling process, and the adjustment amount of the roll bending force is shown in table 3.
TABLE 1
TABLE 2
TABLE 3
The microstructures of the strip steels obtained in examples 1 to 8 were ferrite, pearlite and bainite, the mechanical properties of the strip steels were measured, the results are shown in Table 4, the proportions of ferrite in the strip steels were measured by an optical microscope, and the results are shown in Table 4
TABLE 4
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. A production method of strip steel is characterized in that the strip steel comprises the following chemical components, by weight, 0.04-0.07% of C, 1.0-1.30% of Mn, less than or equal to 0.003% of S, less than or equal to 0.018% of P, 0.08-0.15% of Si, 0.020-0.040% of Als, 0.085-0.105% of Ti, less than or equal to 0.0045% of N, 0.10-0.30% of Cr, and the balance of Fe and inevitable impurities, wherein the steel contains the following Cr, C and Ti in percentage by weight: Cr/C- (Ti/4) is more than or equal to 10.1 and less than or equal to 6.5; the ferrite content in the steel is 78-88 percent by area; the hot rolling cooling process of the strip steel adopts laminar cooling, the laminar cooling sequentially comprises an encryption cold section, a rough adjustment section and a fine adjustment section, the end temperature of the encryption cold section is 710-730 ℃, and the cooling rate ratio of the encryption cold section to the fine adjustment section of the laminar cooling is 1: 2-1: 4, after the encrypted cooling section is finished, air cooling for 5-8 s, wherein the coiling temperature of the strip steel is 610-650 ℃; the inlet temperature of finish rolling is controlled to be 1107-1130 ℃, and the finishing temperature is controlled to be 887-910 ℃.
2. A method of producing strip steel as claimed in claim 1 wherein the cold section, upper header to lower header cooling rate ratio is 1: 1.5-1: 2.5; in the coarse adjustment section and the fine adjustment section, the cooling rates of the upper collecting pipe and the lower collecting pipe are 1: 3-1: 5.
3. the production method of the strip steel according to claim 1, wherein the coiling temperature of the strip steel is determined according to the thickness h of the strip steel, and if h is less than 1.6mm, the coiling temperature is 630-650 ℃; if h is more than or equal to 1.6mm and less than 4.0mm, the coiling temperature is 610-630 ℃.
4. The production method of the strip steel according to the claim 1, 2 or 3, characterized in that in the finish rolling process, the bending force is adjusted, if the thickness h of the strip steel is 1.2-h < 1.8mm, the bending force of the F2-F3 bending roll is reduced and the bending force of the F5-F7 bending roll is increased after the plate coil is cut by flying shears; if the thickness h of the strip steel is more than or equal to 1.8 and less than 4mm, reducing the bending force of the F3 bending roll and increasing the bending force of the F6-F7 bending roll after the plate coil is rolled in the F1 bending roll and is thrown.
5. A method of producing strip steel according to claim 4, wherein the bending force of the F1-F3 bending rolls is not more than 250kN at the most; the bending force of the bending rolls from F5 to F7 is not more than 150kN at most.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003129175A (en) * | 2001-10-24 | 2003-05-08 | Nisshin Steel Co Ltd | High strength hot-rolled steel sheet for architectural metallic-fitting superior in workability and galvanizing property |
| CN104988386A (en) * | 2015-06-19 | 2015-10-21 | 唐山钢铁集团有限责任公司 | Method for producing high-hole-expansion-rate steel 420L for automotive frame |
| CN109355484A (en) * | 2018-09-30 | 2019-02-19 | 唐山不锈钢有限责任公司 | 700MPa grades of superhigh-strength hots of thin gauge roll the production technology of black rust steel band |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003129175A (en) * | 2001-10-24 | 2003-05-08 | Nisshin Steel Co Ltd | High strength hot-rolled steel sheet for architectural metallic-fitting superior in workability and galvanizing property |
| CN104988386A (en) * | 2015-06-19 | 2015-10-21 | 唐山钢铁集团有限责任公司 | Method for producing high-hole-expansion-rate steel 420L for automotive frame |
| CN109355484A (en) * | 2018-09-30 | 2019-02-19 | 唐山不锈钢有限责任公司 | 700MPa grades of superhigh-strength hots of thin gauge roll the production technology of black rust steel band |
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