CN113584401A - 310S heat-resistant steel hot continuous rolling plate coil and processing technology thereof - Google Patents

310S heat-resistant steel hot continuous rolling plate coil and processing technology thereof Download PDF

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CN113584401A
CN113584401A CN202110884080.1A CN202110884080A CN113584401A CN 113584401 A CN113584401 A CN 113584401A CN 202110884080 A CN202110884080 A CN 202110884080A CN 113584401 A CN113584401 A CN 113584401A
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plate
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周嘉晟
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Shandong Shengyang Metal Technology Co Ltd
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Shandong Shengyang Metal Technology Co Ltd
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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
    • 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
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • 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
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a 310S heat-resistant steel hot continuous rolling coil and a processing technology thereof, which is characterized in that the heat-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.035 percent of C, less than or equal to 1.2 percent of Mn, less than or equal to 20.5 percent of Ni, less than or equal to 0.06 percent of N, less than or equal to 0.4 percent of Si, less than or equal to 26 percent of Cr, less than or equal to 0.07 percent of Cu, less than or equal to 0.03 percent of P, less than or equal to 6 percent of Al with the concentration of 4.5 percent and less than or equal to 6 percent of Al, and the balance of Fe element and inevitable impurities; the process comprises the following steps: 1) preparing the raw materials in the proportion into a heating furnace for heating; a preheating section, the temperature is controlled at 700-750 ℃, and the heating time is set to be 50-75 min; heating for a period of time, wherein the temperature is controlled to be 1110-; heating for a second period, wherein the temperature is controlled at 1280-1320 ℃, and the heating time is set to be 65-80 min; the temperature of the soaking section is controlled to be 1280-1300 ℃, and the heating time is set to be 70-90 min; the total in-furnace time is more than or equal to 240 min; the thickness of the plate blank is controlled between 200mm and 220 mm; 2) rough rolling; 3) finish rolling: 4) coiling: 5) uncoiling and welding: 6) annealing: 7) breaking phosphorus and performing shot blasting; 8) and (6) acid washing. The invention can improve the product quality and realize the optimization effect of the product surface.

Description

310S heat-resistant steel hot continuous rolling plate coil and processing technology thereof
Technical Field
The invention belongs to the technical field of stainless steel rolling, and particularly relates to a 310S heat-resistant steel hot continuous rolling plate coil and a processing technology thereof.
Background
The 310S heat-resistant austenitic stainless steel has high Cr and Ni contents, belongs to a high value-added steel grade and has high Cr and Ni contents; the oxidation resistance of the alloy depends mainly on Cr2O3Forming an oxide film;
1) the casting blank has a thick columnar crystal structure, the oxygen and sulfur contents and the inclusion control difficulty of the steel are high, the thermal sensitivity is high, and simultaneously the a-Cr on the surface of the alloy2O3The film and the matrix have larger thermal expansion coefficient, are easy to peel off under the action of thermal stress, have poor plasticity and are easy to crack; at temperatures above 900 deg.C, partial oxidation to CrO occurs3Thinning the oxide film;
2) irregular burrs can appear on two sides of the plate in the rolling process, and the irregular burrs need to be cut off before the plate is rolled and enters the next process, so that the plate is regular;
therefore, the development and production of the 310S heat-resistant austenitic stainless steel and the research on the reasonable production process thereof have important significance for smoothly implementing industrial production, better meeting market demands, optimizing the industrial structure of the stainless steel of the company and improving the enterprise competitiveness.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a 310S heat-resistant steel hot continuous rolling plate coil and a processing technology thereof, which can improve the product quality and realize the optimization effect of the product surface.
In order to achieve the purpose, the invention adopts the technical scheme that:
A310S heat-resistant steel hot continuous rolling plate coil and a processing technology thereof are disclosed, wherein the heat-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.035 percent of C, less than or equal to 1.2 percent of Mn, less than or equal to 20.5 percent of Ni, less than or equal to 0.06 percent of N, less than or equal to 0.4 percent of Si, less than or equal to 26 percent of Cr, less than or equal to 0.07 percent of Cu, less than or equal to 0.03 percent of P, less than or equal to 6 percent of Al with the concentration of 4.5 percent and less than or equal to 6 percent of Al, and the balance of Fe element and inevitable impurities;
the process comprises the following steps:
1) preparing the component raw material plate blank to a heating furnace for heating, wherein the heating step is divided into a preheating section, a heating section and a soaking section in sequence, and the thickness of the plate blank is controlled between 200 and 220 mm; a preheating section, the temperature is controlled at 700-750 ℃, and the heating time is set to be 50-75 min; heating for a period of time, wherein the temperature is controlled to be 1110-; heating for a second period, wherein the temperature is controlled at 1280-1320 ℃, and the heating time is set to be 65-80 min; the temperature of the soaking section is controlled to be 1280-1300 ℃, and the heating time is set to be 70-90 min; the total in-furnace time is 240-270 min.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device; carrying out 5-pass rolling on the steel ingot during rough rolling; the reduction rate of one pass is 23.5-25.5%; the second pass reduction rate is 24.5-26.5%; the three-pass reduction rate is 27-29%; the four-pass reduction rate is 27-29%; the five-pass reduction rate is 29-32%; the thickness of the intermediate blank after rough rolling is controlled to be 35-45 mm; rough rolling outlet temperature 1130 and 1160 ℃;
3) finish rolling and trimming: the steel wire is conveyed into a finish rolling mechanism, the finish rolling adopts accelerated rolling, and the finish rolling initial temperature is set to 1120-; the finishing temperature of finish rolling is controlled at 900-; after finishing finish rolling, cutting irregular burrs on two sides of the stainless steel plate through a burr cutting mechanism; the burr cutting device is provided with a trimming mechanism;
the trimming mechanism comprises a fixed seat II, a cutter, a fixed plate II, a fixed plate III, a supporting plate, a guide shaft, a spring, an oil cylinder II and a bearing plate; the oil cylinder II is fixed on the fixing block, and a top shaft of the oil cylinder II is fixedly connected with the fixing seat II; the cutter is fixed at the bottom of the fixing seat II through a rotating shaft; the bearing plate is fixedly connected with the rack, the bearing plate is arranged below the cutter and corresponds to the position of the cutter, the bottom of the bearing plate is provided with a ribbed plate for carrying out auxiliary support on the bearing plate, and the ribbed plate is arranged in a gap between adjacent conveying rollers and is fixedly connected with the rack; the fixing plate II is fixed on the side edge of the fixing seat II; a support frame is arranged at the bottom of the fixing plate II and fixedly connected with a fixing seat II; the fixing plate III is fixedly connected with the bottom surface of the fixing plate II, is arranged in the middle of the fixing plate II and corresponds to the position of the cutter; a triangular splitter plate is arranged on the end face of the fixing plate III, and a through groove is formed in the side face of the fixing plate III; one end of the supporting plate is hinged to the inner side of the triangular splitter plate; one end of the guide shaft is hinged with the inner side surface of the supporting plate, and the other end of the guide shaft penetrates through the through groove; one end of the guide shaft is fixedly provided with a limiting plate I, and the other end of the guide shaft is provided with a limiting plate II which is movably connected through a through hole; the spring is sleeved with the guide shaft, and two ends of the spring respectively abut against the limiting plate I and the limiting plate II.
4) Coiling: after finish rolling, feeding the steel plate into a coiling mechanism for coiling, and ensuring that the coiling temperature is controlled between 550 ℃ and 600 ℃;
5) uncoiling and welding: two adjacent groups of steel plates are welded and fixed through a welding mechanism, so that the whole pickling of the steel plates is facilitated;
6) annealing: annealing the hot continuous rolled steel plate by an annealing mechanism, and then cooling;
7) breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed hot continuous rolled steel plate by using a shot blasting machine;
8) acid washing: pickling the hot continuous rolled steel plate by using a pickling mechanism to remove oxide skins; the acid washing process is provided with a mixed acid first section and a mixed acid second section; the concentration of the first-stage mixed acid HNO3 is 60 +/-5 g/L, the concentration of HF is 30 +/-5 g/L, the metal ions are less than 40g/L, and the temperature is 60 +/-5 ℃; the concentration of the mixed acid second-stage HNO3 is 75 +/-5 g/L, the concentration of HF is 40 +/-5 g/L, the metal ions are less than 35g/L, and the temperature is 45 +/-10 ℃;
9) drying: cleaning the hot continuous rolled steel plate after acid cleaning through a cleaning mechanism, drying the hot continuous rolled steel plate through a drying system, and then performing curling treatment;
preferably, in the chemical components of the heat-resistant steel in percentage by weight, Ni is more than or equal to 18.55 percent, and Cr is more than or equal to 24.85 percent; cr% + Ni% > 45%.
Compared with the prior art, the invention has the beneficial effects that:
1) the total in-furnace time of the steel ingot heating section is set to be 240-270 min; the steel ingot can be rapidly heated within a specified time by consuming lower standard energy;
2) compared with the common 304 stainless steel, the 310S stainless steel has excellent heat resistance, and can be used in a more high-temperature and harsh working environment; when the total content of chromium and nickel in the 310S stainless steel is more than 45 percent, Cr is generated on the surface2O3A protective oxide film, and the internal oxidation rate is lower;meanwhile, the adhesion of the oxide film can be improved by improving the nickel content, and the stripping is reduced;
3) the trimming mechanism is provided with a supporting plate, a spring, a triangular splitter plate and a fixing plate III; the triangular splitter plate is used for conducting preliminary separation and guide on the cut rough edges, and then the supporting plate is pushed by the spring to conduct further elastic guide on the rough edges, so that the phenomenon that the rough edges are wound and curled is avoided;
4) the addition of Al element generates Al2O3，Compared with Cr2O3The stainless steel plate has better oxidation resistance and lower oxidation rate, meets higher temperature, and has obviously improved oxidation resistance under the synergistic action of Cr and Al when the stainless steel plate contains the Cr and the Al simultaneously; and when the Al content is kept between 4.5 and 6 percent, the mechanical property and the oxidation resistance are obviously improved.
Drawings
FIG. 1 is a schematic structural diagram of a 310S heat-resistant steel hot continuous rolled plate coil and a burr cutting device in the processing technology thereof;
FIG. 2 is a schematic view of the trimming mechanism of FIG. 1;
fig. 3 is a schematic view illustrating a position structure of the pressure bearing plate of fig. 1;
1. a frame; 101. a conveying roller; 2. a fixed mount; 3. an adjustment mechanism; 4. a trimming mechanism; 401. a fixed seat II; 402. a cutter; 403. fixing a plate II; 4031. a support frame; 404. a fixing plate III; 4041. a through groove; 4042. a triangular splitter plate; 405. a supporting plate; 407. a guide shaft; 4071. a limiting plate I; 4072. a limiting plate II; 408. a spring; 409. an oil cylinder II; 410. a pressure bearing plate; 5. an auxiliary guide mechanism; 6. a material receiving frame; 7. a steel plate; 701. and (4) rough selvedge.
Detailed Description
For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 3.
Example 1:
A310S heat-resistant steel hot continuous rolling plate coil and a processing technology thereof are disclosed, wherein the heat-resistant steel comprises the following chemical components in percentage by weight: c ═
0.03%, Mn 1.1%, Ni 19.5%, N0.05%, Si 0.35%, Cr 25.5%, Cu 0.065%, P0.025%, S0.001%, Al 5.5%, and the balance Fe and inevitable impurities;
the process comprises the following steps:
1) preparing the raw material plate blanks of the components to a heating furnace for heating, wherein the heating step is divided into a preheating section, a heating section and a soaking section in sequence; a preheating section, wherein the temperature is controlled at 710 ℃, and the heating time is set to be 70 min; heating for a period of time, wherein the temperature is controlled to be 1125 ℃, and the heating time is set to be 50 min; heating for a second period, wherein the temperature is controlled at 1285 ℃, and the heating time is set to 65 min; a soaking section, wherein the temperature is controlled at 1280 ℃, and the heating time is set to 72 min; the total oven time is 257 min; the thickness of the plate blank is controlled to be 200 mm.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device; carrying out 5-pass rolling on the steel ingot during rough rolling; the reduction rate of one pass is 25.18 percent; the reduction rate of the second pass is 26.08%; the three-pass reduction rate is 28.77 percent; the four-pass reduction rate is 28.77 percent; the five-pass reduction rate is 29.67 percent; the thickness of the intermediate billet after rough rolling is controlled to be 38 mm; the rough rolling outlet temperature is 1150 ℃;
3) finish rolling and trimming: the steel plate enters a finish rolling mechanism after being transmitted, the finish rolling adopts accelerated rolling, and the finish rolling initial rolling temperature is set to be 1125 ℃; the finish rolling finishing temperature is controlled at 1050 ℃; after finishing finish rolling, cutting irregular burrs on two sides of the stainless steel plate through a burr cutting mechanism; the burr cutting device is provided with a trimming mechanism;
the trimming mechanism 4 comprises a fixed seat II 401, a cutter 402, a fixed plate II 403, a fixed plate III 404, a supporting plate 405, a guide shaft 407, a spring 408, an oil cylinder II 409 and a bearing plate 410; the oil cylinder II 409 is fixed on the fixing block, and the top shaft of the oil cylinder II 409 is fixedly connected with a fixing seat II 401; the cutter 402 is fixed at the bottom of the fixing seat II 401 through a rotating shaft; the bearing plate 410 is fixedly connected with the rack 1, the bearing plate 410 is arranged below the cutter 402 and corresponds to the cutter 402, the bottom of the bearing plate 410 is provided with a ribbed plate for auxiliary support of the bearing plate 410, and the ribbed plate is arranged in a gap between adjacent conveying rollers 101 and is fixedly connected with the rack 1; the fixing plate II 403 is fixed on the side edge of the fixing seat II 401; a support 4031 is arranged at the bottom of the fixing plate II 403, and the support 4031 is fixedly connected with the fixing seat II 401 and plays a role in assisting in fixing and supporting the fixing plate II 403; the fixing plate III 404 is fixedly connected with the bottom surface of the fixing plate II 403, and the fixing plate III 404 is arranged in the middle of the fixing plate II 403 and corresponds to the position of the cutter 402; the end face of the fixing plate III 404 is provided with a triangular splitter plate 4042, and the side face of the fixing plate III 404 is provided with a through groove 4041; one end of the supporting plate 405 is hinged with the inner side of the triangular splitter plate 4042; one end of the guide shaft 407 is hinged with the inner side surface of the supporting plate 405, and the other end of the guide shaft passes through the through groove 4041; one end of the guide shaft 407 is fixedly provided with a limit plate I4071, and the other end of the guide shaft is provided with a limit plate II 4072 and is movably connected through a through hole; the spring 408 is sleeved with the guide shaft 407, and two ends of the spring 408 respectively push against a limit plate I4071 and a limit plate II 4072; the spring 408 provides elastic force to push the supporting plate 405, so that the supporting plate 405 achieves an elastic supporting effect.
When the steel sheet 7 conveys through the transfer roller 101 on the frame 1, through the position of the 3 control trimming mechanism 4 of adjustment mechanism on the mount 2, and then accurate deckle edge 701 to steel sheet 7 excises, and supplementary guiding mechanism 5 guides deckle edge 701 to get into and receives work or material rest 6 and carry out deckle edge 701 and collect.
4) Coiling: after finish rolling, feeding the rolled steel into a coiling mechanism for coiling, and ensuring that the coiling temperature is controlled to be 560 ℃;
5) uncoiling and welding: two adjacent groups of steel plates are welded and fixed through a welding mechanism, so that the whole pickling of the steel plates is facilitated;
6) annealing: annealing the hot continuous rolled steel plate by an annealing mechanism, and then cooling;
7) breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed hot continuous rolled steel plate by using a shot blasting machine;
8) acid washing: pickling the hot continuous rolled steel plate by using a pickling mechanism to remove oxide skins; the acid washing process is provided with a mixed acid first section and a mixed acid second section; the concentration of the first-stage mixed acid HNO3 is 55g/L, the concentration of HF is 25g/L, the metal ion is 35g/L, and the temperature is 55.5 ℃; the concentration of the mixed acid second-stage HNO3 is 65g/L, the concentration of HF is 30g/L, the metal ion concentration is 25g/L, and the temperature is 43.5 ℃;
9) drying: cleaning the hot continuous rolled steel plate after acid cleaning through a cleaning mechanism, drying the hot continuous rolled steel plate through a drying system, and then performing curling treatment;
according to GBT4237-2015, the mechanical property experimental data of the stainless steel coil obtained in example 1 are as follows: the tensile strength is 584Mpa, the elongation strength is 287Mpa, the elongation is 42 percent, and the HRB value is 84;
example 2:
compared with the embodiment 1, the difference is that the heat-resistant steel hot continuous rolling plate coil of 310S and the processing technology thereof, the chemical composition weight percentage of the heat-resistant steel is 20.5 percent of Ni, 25 percent of Cr, 4.8 percent of Al, and the rest are unchanged;
preparing the raw materials in the proportion in the step 1) to a heating furnace for heating; a preheating section, wherein the temperature is controlled at 725 ℃, and the heating time is set to 65 min; heating for a period of time, wherein the temperature is controlled to be 1120 ℃, and the heating time is set to be 50 min; heating for a second period, wherein the temperature is controlled at 1290 ℃, and the heating time is set to 70 min; a soaking section, wherein the temperature is controlled at 1285 ℃, and the heating time is set to be 70 min; the total in-furnace time is 255 min; the thickness of the plate blank is controlled to be 210 mm.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device; carrying out 5-pass rolling on the steel ingot during rough rolling; the one-pass reduction rate is 24.2 percent; the reduction rate of the second pass is 25.05 percent; the three-pass reduction rate is 27.1%; the four-pass reduction rate is 28.5 percent; the five-pass reduction rate is 31.05 percent; the thickness of the intermediate billet after rough rolling is controlled to be 42 mm; the rough rolling outlet temperature is 1135 ℃;
according to the experimental data of the mechanical properties of GBT4237-2015 and the stainless steel coil obtained in example 2, the following data are obtained: tensile strength is 576MPa, elongation is 265MPa, elongation is 45.5%, and HRB value is 79;
example 3:
compared with the embodiment 1, the difference is that the heat-resistant steel hot continuous rolling plate coil of 310S and the processing technology thereof, the chemical composition weight percentage of the heat-resistant steel is 19.35 percent of Ni, 25.85 percent of Cr, 5.2 percent of Al, and the rest are unchanged;
preparing the raw materials in the proportion in the step 1) to a heating furnace for heating; a preheating section, the temperature is controlled at 700-; heating for a first period, wherein the temperature is controlled to be 1110-; heating for a second period, wherein the temperature is controlled to be 1280-1320 ℃, and the heating time is set to be 65.5 min; the temperature of the soaking section is controlled to be 1280-1300 ℃, and the heating time is set to be 70.5 min; the total in-furnace time is 264.5 min; the thickness of the plate blank is controlled to be 205 mm.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device; carrying out 5-pass rolling on the steel ingot during rough rolling; the one-pass reduction rate is 24.35 percent; the reduction rate of the second pass is 25.3 percent; the three-pass reduction rate is 27.5 percent; the four-pass reduction rate is 28.8 percent; the five-pass reduction rate is 31.15 percent; the thickness of the intermediate billet after rough rolling is controlled to be 38 mm; rough rolling outlet temperature 1140 ℃;
according to the experimental data of the mechanical properties of GBT4237-2015 and the stainless steel coil obtained in example 3: tensile strength of 581MPa, elongation of 276MPa, elongation of 43%, HRB value of 82.
The experimental results obtained in the above examples are all in a qualified state according to GBT 4237-2015.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.

Claims (6)

1. A310S heat-resistant steel hot continuous rolling plate coil and a processing technology thereof are characterized in that the heat-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.035 percent of C, less than or equal to 1.2 percent of Mn, less than or equal to 20.5 percent of Ni, less than or equal to 0.06 percent of N, less than or equal to 0.4 percent of Si, less than or equal to 26 percent of Cr, less than or equal to 0.07 percent of Cu, less than or equal to 0.03 percent of P, less than or equal to 6 percent of Al with the concentration of 4.5 percent and less than or equal to 6 percent of Al, and the balance of Fe element and inevitable impurities;
the process comprises the following steps:
1) preparing the component raw material plate blank to a heating furnace for heating, wherein the heating step is divided into a preheating section, a heating section and a soaking section in sequence, and the thickness of the plate blank is controlled between 200 and 220 mm;
2) rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device;
3) finish rolling and trimming: the steel wire is conveyed into a finish rolling mechanism, the finish rolling adopts accelerated rolling, and the finish rolling initial temperature is set to 1120-; the finishing temperature of finish rolling is controlled at 900-; after finishing finish rolling, cutting irregular burrs on two sides of the stainless steel plate through a burr cutting mechanism;
4) coiling: after finish rolling, feeding the steel plate into a coiling mechanism for coiling, and ensuring that the coiling temperature is controlled between 550 ℃ and 600 ℃;
5) uncoiling and welding: two adjacent groups of steel plates are welded and fixed through a welding mechanism, so that the whole pickling of the steel plates is facilitated;
6) annealing: annealing the hot continuous rolled steel plate by an annealing mechanism, and then cooling;
7) breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed hot continuous rolled steel plate by using a shot blasting machine;
8) acid washing: pickling the hot continuous rolled steel plate by using a pickling mechanism to remove oxide skins;
9) drying: and cleaning the hot continuous rolled steel plate after acid cleaning by a cleaning mechanism, and then drying the hot continuous rolled steel plate by a drying system and then performing curling treatment.
2. The 310S heat-resistant steel hot continuous rolling coil and the processing technology thereof as claimed in claim 1, wherein the temperature of the preheating section is controlled at 700-750 ℃, and the heating time is set to 50-75 min; heating for a period of time, wherein the temperature is controlled to be 1110-; heating for a second period, wherein the temperature is controlled at 1280-1320 ℃, and the heating time is set to be 65-80 min; the temperature of the soaking section is controlled to be 1280-1300 ℃, and the heating time is set to be 70-90 min; the total in-furnace time is 240-270 min.
3. The 310S heat-resistant steel hot continuous rolling coil and the processing technology thereof as claimed in claim 1, wherein the steel ingot is subjected to 5-pass rolling during rough rolling; the reduction rate of one pass is 23.5-25.5%; the second pass reduction rate is 24.5-26.5%; the three-pass reduction rate is 27-29%; the four-pass reduction rate is 27-29%; the five-pass reduction rate is 29-32%; the thickness of the intermediate blank after rough rolling is controlled to be 35-45 mm; the rough rolling outlet temperature 1130-.
4. The 310S heat-resistant steel hot continuous rolling coil and the processing technology thereof as claimed in claim 1, wherein the pickling technology is provided with a first mixed acid section and a second mixed acid section; the concentration of the first-stage mixed acid HNO3 is 60 +/-5 g/L, the concentration of HF is 30 +/-5 g/L, the metal ions are less than 40g/L, and the temperature is 60 +/-5 ℃; the concentration of the mixed acid second-stage HNO3 is 75 +/-5 g/L, the concentration of HF is 40 +/-5 g/L, the metal ion is less than 35g/L, and the temperature is 45 +/-10 ℃.
5. The 310S heat-resistant steel hot continuous rolling coil and the processing technology thereof as claimed in claim 1, wherein the chemical components in the weight percentage of Ni is more than or equal to 18.55 percent and Cr is more than or equal to 24.85 percent; cr% + Ni% > 45%.
6. The 310S heat-resistant steel hot continuous rolling coil and the processing technology thereof as claimed in claim 1, wherein the burr cutting device in the step 3) is provided with a trimming mechanism; the trimming mechanism comprises a fixed seat II, a cutter, a fixed plate II, a fixed plate III, a supporting plate, a guide shaft, a spring, an oil cylinder II and a bearing plate; the oil cylinder II is fixed on the fixing block, and a top shaft of the oil cylinder II is fixedly connected with the fixing seat II; the cutter is fixed at the bottom of the fixing seat II through a rotating shaft; the bearing plate is fixedly connected with the rack, the bearing plate is arranged below the cutter and corresponds to the position of the cutter, the bottom of the bearing plate is provided with a ribbed plate for carrying out auxiliary support on the bearing plate, and the ribbed plate is arranged in a gap between adjacent conveying rollers and is fixedly connected with the rack; the fixing plate II is fixed on the side edge of the fixing seat II; a support frame is arranged at the bottom of the fixing plate II and fixedly connected with a fixing seat II; the fixing plate III is fixedly connected with the bottom surface of the fixing plate II, is arranged in the middle of the fixing plate II and corresponds to the position of the cutter; a triangular splitter plate is arranged on the end face of the fixing plate III, and a through groove is formed in the side face of the fixing plate III; one end of the supporting plate is hinged to the inner side of the triangular splitter plate; one end of the guide shaft is hinged with the inner side surface of the supporting plate, and the other end of the guide shaft penetrates through the through groove; one end of the guide shaft is fixedly provided with a limiting plate I, and the other end of the guide shaft is provided with a limiting plate II which is movably connected through a through hole; the spring is sleeved with the guide shaft, and two ends of the spring respectively abut against the limiting plate I and the limiting plate II.
CN202110884080.1A 2021-08-03 2021-08-03 310S heat-resistant steel hot continuous rolling plate coil and processing technology thereof Pending CN113584401A (en)

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CN116475232A (en) * 2023-05-30 2023-07-25 常州市凯宏铝业有限公司 Hot rolling former of double-deck aluminium alloy plate of accurate location
CN116475232B (en) * 2023-05-30 2023-10-17 常州市凯宏铝业有限公司 Hot rolling former of double-deck aluminium alloy plate of accurate location

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